A fabricated spiral ground pile

Abstract

This utility model relates to the field of civil engineering reinforcement technology and discloses a prefabricated helical pile, comprising: a base and a pile body. The base includes: a first flange and a pile sleeve, the pile sleeve being connected to the first flange. Assembly holes are provided on the pile sleeve and the first flange, and the pile sleeve is suitable for penetrating into the soil. The pile body includes: a second flange, a pile shaft, and a pile head. One end of the pile shaft is connected to the second flange, and the other end is connected to the pile head. Multiple helical blades are spaced apart along the axial direction on the outer wall of the pile shaft. The first flange and the second flange are detachably connected. The pile body is suitable for being screwed into the soil from the assembly holes under external force. This utility model solves the problems of inaccurate positioning and poor pull-out resistance of existing pile structures by disassembling and assembling the base and the pile body.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering reinforcement technology, specifically to a prefabricated helical ground pile. Background Technology

[0002] In various engineering construction projects, the foundation is a crucial structural component that bears and transfers loads to the ground, and its performance directly affects the safety and stability of the entire project. In engineering environments with complex geological conditions, short construction periods, or limited site conditions, traditional concrete foundations often face problems such as long construction cycles, high material consumption, and significant environmental disturbance. Therefore, ground piles have gradually become widely used, serving as an ideal choice for rapid, efficient, and low-disturbance construction.

[0003] Ground piles, formed by directly pressing or hammering prefabricated components into the soil to create an anchoring structure, offer advantages such as simple construction, short construction period, and recyclability, making them particularly suitable for various engineering applications including photovoltaic supports, slope protection, temporary structures, pipeline fixing, and traffic signs. However, these ground piles are prone to loosening and settling under long-term loads or vibrations, affecting long-term stability. For projects with high bearing capacity requirements or poor foundation soil quality, some ground piles lack effective reinforcement measures, resulting in weak pile-soil bonding and failing to meet safety requirements. Furthermore, ground piles can deviate or tilt during installation and use. Therefore, there is an urgent need for a ground pile structure with high pull-out resistance and accurate positioning. Utility Model Content

[0004] In view of this, the present invention provides a prefabricated helical ground pile to solve the problems of inaccurate positioning and poor pull-out resistance of existing ground pile structures.

[0005] In a first aspect, this utility model provides a prefabricated helical ground pile, comprising:

[0006] The base includes: a first flange and a pile sleeve, the pile sleeve being connected to the first flange, and assembly holes being provided on the pile sleeve and the first flange, the pile sleeve being adapted to penetrate into the soil;

[0007] The pile body includes a second flange, a pile body, and a pile head. One end of the pile body is connected to the second flange, and the other end is connected to the pile head. Multiple spiral blades are spaced apart along the axial direction on the outer wall of the pile body. The first flange and the second flange are detachably connected. The pile body is adapted to be screwed into the soil from the assembly hole under external force.

[0008] Beneficial effects

[0009] The base is first driven into the soil, and the pile body is then spirally inserted into the assembly hole along the axis of the pile sleeve and screwed into the soil. The base and pile body are quickly connected via a first and second flange. The pile sleeve in the base can be directly driven into the soil, and the assembly hole provides accurate guidance for the pile body, improving positioning accuracy during construction. Multiple spiral blades are installed on the outside of the pile body, allowing it to spirally screw into the soil along the assembly hole, significantly enhancing the pile's embedment force and effectively improving the pull-out resistance and overall stability of the spiral pile. This enables rapid assembly and disassembly of the spiral pile, facilitating transportation and reuse, and improving construction efficiency.

[0010] In one optional embodiment, the second flange has a swivel hole, the pile body has a cavity with one end open, the swivel hole communicates with the cavity, and the pile body has a plurality of grouting holes.

[0011] Beneficial effects

[0012] The swivel hole is connected to the cavity inside the pile body. After the pile body is swiveled into the soil, mortar is injected into the cavity through the swivel hole and evenly distributed to the soil layer around the pile body through multiple grouting holes on the pile body to form grouting reinforcement, thereby enhancing the bonding strength between the pile body and the soil body and the bearing capacity of the foundation.

[0013] In one alternative embodiment, a removable swivel block is provided on the swivel hole.

[0014] In one optional embodiment, the outer wall of the rotating block is provided with a plurality of locking teeth spaced apart along its circumference, and the outer periphery of the rotating hole is provided with a plurality of locking grooves spaced apart along its circumference, the locking teeth being adapted to engage with the locking grooves.

[0015] In one alternative embodiment, the rotating block is provided with a cross groove suitable for connection with a drive device.

[0016] Beneficial effects

[0017] The cross groove can be used with the drive device to facilitate the drive device to rotate the pile as a whole and insert it into the soil in a spiral.

[0018] After the mortar injection is completed, the detachable swivel block can seal the swivel hole, effectively preventing grout backflow or foreign objects from entering the pile body, and maintaining the sealing and durability of the cavity.

[0019] In one alternative embodiment, the outer wall of the pile sleeve is provided with a plurality of wing plates spaced apart along its circumference, and the wing plates are connected to the first flange.

[0020] Beneficial effects

[0021] The flanges enhance the lateral shear resistance and embedment between the foundation and the soil, while also expanding the contact area between the pile sleeve and the soil, forming an effective anchoring structure to prevent the pile from loosening or displacing under long-term loads or external forces.

[0022] In one optional embodiment, a pull-out plate is provided on the wing plate, the bottom end of the pull-out plate is connected to the wing plate, and the pull-out plate is set at an angle to the wing plate.

[0023] Beneficial effects

[0024] After the pull-out plate is inserted into the soil, it forms an additional resistance surface, which can significantly enhance the pull-out resistance of the foundation and effectively prevent the foundation from being pulled up under vertical tension, thereby improving the pull-out performance of the helical pile.

[0025] In one alternative embodiment, the wing plate and the pile sleeve have an acute-angled cutting edge at the end away from the first flange.

[0026] Beneficial effects

[0027] The cutting edge can effectively cut the soil during the foundation penetration process, reduce construction resistance, minimize disturbance to the surrounding soil, and enhance the stability of the foundation penetration process.

[0028] In one alternative embodiment, the wing plate gradually decreases in size from the end closest to the pile sleeve to the end furthest from the pile sleeve.

[0029] In one optional embodiment, the first flange and the second flange are provided with a plurality of bolt holes spaced apart. A threaded sleeve is fixedly provided below the bolt holes of the first flange. The bolts pass through the bolt holes on the first flange and the second flange and are screwed to the threaded sleeve. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a structural schematic diagram of an assembled spiral ground pile according to an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the base structure according to an embodiment of the present utility model;

[0033] Figure 3This is a schematic diagram of the pile body according to an embodiment of the present utility model;

[0034] Figure 4 This is a schematic diagram of the structure of the rotating block in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Base; 11. First flange; 12. Pile sleeve; 13. Assembly hole; 14. Flange; 15. Pull-out plate; 16. Cutting edge; 17. Bolt hole; 18. Threaded sleeve.

[0037] 2. Pile body; 21. Second flange; 22. Pile shaft; 23. Pile head; 24. Spiral blade; 25. Spiral hole; 26. Grouting hole; 27. Slot.

[0038] 3. Rotary block; 31. Clamping tooth; 32. Cross groove. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0041] According to an embodiment of the present invention, an assembled helical pile is provided, comprising: a base 1 and a pile body 2. The base 1 includes: a first flange 11 and a pile sleeve 12, the pile sleeve 12 being connected to the first flange 11. Assembly holes 13 are provided on the pile sleeve 12 and the first flange 11, and the pile sleeve 12 is suitable for penetrating into the soil. The pile body 2 includes: a second flange 21, a pile body 22, and a pile head 23. One end of the pile body 22 is connected to the second flange 21, and the other end is connected to the pile head 23. A plurality of helical blades 24 are spaced apart along the axial direction on the outer wall of the pile body 22. The first flange 11 and the second flange 21 are detachably connected. The pile body 2 is suitable for being screwed into the soil from the assembly holes 13 under the drive of external force.

[0042] The base 1 consists of a first flange 11 and a pile sleeve 12. The pile sleeve 12 is a hollow cylindrical structure, with one end vertically welded to the center of the first flange 11. The pile sleeve 12 is suitable for being inserted into the surface soil first, playing a preliminary guiding and stabilizing role.

[0043] The pile body 2 consists of a second flange 21, a pile body 22, and a pile head 23. The pile body 22 is a hollow steel pipe, with one end connected to the second flange 21 and the other end fixedly fitted with a pile head 23, which is a conical head. Multiple spiral blades 24 are evenly spaced along the axial direction on the outer wall of the pile body 22. These spiral blades 24 are arranged in a continuous or segmented spiral structure, enabling them to cut into the soil and provide downward thrust when the pile body 2 rotates. During construction, the base 1 penetrates the soil first, and the pile body 2 is spirally inserted into the assembly hole 13 along the axial direction of the pile sleeve 12 and screwed into the soil.

[0044] After the pile sleeve 12 penetrates the soil, it provides stable guidance for the pile body 2, further ensuring the verticality and positioning accuracy of the pile body 2 during construction, and improving the stability and long-term bearing capacity of the helical pile. The pile body 2 is helically inserted into the soil along the assembly hole 13. Multiple helical blades 24 are provided on the outside of the pile body 2, which actively cut into the soil by rotation, effectively enhancing the friction and embedment force between the pile body 2 and the soil, and improving the overall pull-out resistance of the helical pile. The base 1 and the pile body 2 are detachably connected by a flange, which significantly improves the assembly flexibility of the helical pile, facilitates rapid installation on the construction site, and adapts to complex and changing construction conditions.

[0045] In one embodiment, the outer wall of the pile sleeve 12 is provided with a plurality of wing plates 14 spaced apart along its circumference, and the wing plates 14 are connected to the first flange 11.

[0046] Specifically, four flanges 14 are evenly spaced along the circumference of the outer wall of the pile sleeve 12. Each flange 14 is a flat metal plate that is vertically welded to the outer wall of the pile sleeve 12 and one end is connected to the first flange 11.

[0047] The wing plates 14 are evenly distributed around the outer wall of the pile sleeve 12. During the process of the pile sleeve 12 being inserted into the soil, they can simultaneously cut into the soil layer and provide additional lateral embedment force, thereby increasing the contact area between the base 1 and the surrounding soil and effectively improving the pull-out resistance of the pile body 2 when subjected to upward and lateral forces.

[0048] In one embodiment, a pull-out plate 15 is provided on the wing plate 14, the bottom end of the pull-out plate 15 is connected to the wing plate 14, and the pull-out plate 15 is set at an angle to the wing plate 14.

[0049] Specifically, each wing plate 14 has a rectangular opening in the middle, and a pull-out plate 15 is connected to the opening. The pull-out plate 15 is a metal sheet that is set obliquely upward, and its bottom end is fixedly connected to the wing plate 14. The included angle is generally set to 30° to 60° to ensure that an effective resistance surface can be formed when the base 1 is subjected to force in the vertical direction.

[0050] The pull-out plate 15 is embedded in the soil along with the wing plate 14. The obliquely distributed structure allows the base 1 to form a reverse resistance with the soil when subjected to vertical upward pull-out force, providing additional anchoring force and significantly improving the pull-out performance of the base 1.

[0051] In one embodiment, the wing plate 14 and the pile sleeve 12 are provided with an acute-angled cutting edge 16 at the end away from the first flange 11.

[0052] Specifically, the outer edge of the bottom end of the pile sleeve 12 is machined into an acute-angle cutting edge 16, forming a ring-shaped cutting edge 16, which breaks the soil first when the base 1 is pressed down or screwed in, reducing resistance. The bottom end of the wing plate 14 is also machined into an acute-angle cutting edge 16 to facilitate simultaneous cutting into the soil layer.

[0053] The angle of the cutting edge 16 is generally controlled between 30° and 45° to ensure maximum penetration capability without affecting the structural strength of the base 1. The cutting edge 16 helps to generate active cutting force when the base 1 penetrates the soil, reducing the penetration resistance during the installation of the base 1 and improving construction efficiency.

[0054] In one embodiment, the dimensions of the wing plate 14 gradually decrease from the end closest to the pile sleeve 12 to the end furthest from the pile sleeve 12.

[0055] Specifically, the root of each flange 14 (i.e., the end connected to the pile sleeve 12) is larger, while the top (i.e., the end away from the pile sleeve 12) gradually narrows and thins, forming a beveled shape. The wedge-shaped structure design of the flange 14 helps the flange 14 to gradually cut the soil and distribute the force evenly during the penetration process, thereby improving the cutting efficiency.

[0056] In one embodiment, the second flange 21 has a swivel hole 25, the pile body 22 has a cavity with one end open, the swivel hole 25 communicates with the cavity, and the pile body 22 has a plurality of grouting holes 26.

[0057] Specifically, the swivel hole 25 is located at the center of the second flange 21 and runs through the entire second flange 21. The pile body 22 has a hollow structure, and its end near the second flange 21 has an open cavity. This cavity is connected to the swivel hole 25 on the second flange 21 to form a through path for subsequent grouting operations.

[0058] Multiple rows of grouting holes 26 are provided on the side wall of the pile body 22 along its circumference and are spaced apart along the axial direction of the pile body 22. These grouting holes 26 are connected to the inner cavity of the pile body 22 and are distributed on the outer wall of the pile body 22. The diameter of the grouting holes 26 is moderate, which ensures that the mortar flows out smoothly without weakening the strength of the pile body 22.

[0059] In the actual construction process, the mortar is injected through the swirl hole 25, flows through the cavity inside the pile body 22 to the grouting hole 26, and then flows out from the grouting hole 26 into the soil layer around the pile body 2, forming a wrapping reinforcement structure.

[0060] In one embodiment, a removable rotating block 3 is provided on the rotating hole 25.

[0061] Specifically, the rotating block 3 is a cylindrical metal sheet whose size matches the rotating hole 25, allowing it to be inserted into the rotating hole 25 and achieve a seal. The rotating block 3 is connected to the rotating hole 25 by snap-fit ​​or plug-in engagement, and construction personnel can disassemble and assemble it according to usage requirements.

[0062] After grouting is completed, the swivel block 3 can be inserted into the swivel hole 25 and fixed to prevent grout backflow or foreign objects from entering the internal cavity of the pile body 2, thus providing a sealing and protective function. In the future, when maintenance or regrouting is required, the swivel block 3 can also be easily disassembled to provide a channel for re-grouting.

[0063] In one embodiment, a plurality of locking teeth 31 are provided at intervals along the circumference of the outer wall of the rotating block 3, and a plurality of locking grooves 27 are provided at intervals along the circumference of the outer periphery of the rotating hole 25, wherein the locking teeth 31 are adapted to engage with the locking grooves 27.

[0064] Specifically, the outer wall of the swivel block 3 is provided with multiple locking teeth 31 at intervals along its circumference. The locking teeth 31 are raised structures and are arranged at equal intervals. Correspondingly, the inner wall of the outer periphery of the swivel hole 25 on the second flange 21 is provided with multiple locking grooves 27 corresponding to the positions of the locking teeth 31. The locking grooves 27 are recessed structures, and their dimensions are matched with the locking teeth 31. The swivel block 3 can be inserted into the swivel hole 25 along the axial direction of the pile body 2 and precisely align with the locking grooves 27 to form a stable locking relationship.

[0065] In one embodiment, the rotary block 3 is provided with a cross groove 32 suitable for connection with a drive device.

[0066] Specifically, the cross groove 32 can cooperate with a drive device (such as an electric wrench, rotary drilling rig, etc.) to rotate the pile body 2 as a whole and screw it into the soil. The cross groove 32 is connected to the cavity of the pile body 22 through the swivel block 3 to form a transmission path, so that the external driving force can be effectively transmitted to the pile body 2, and the drive device can perform the screwing operation without directly contacting the pile body 2.

[0067] In one embodiment, a plurality of bolt holes 17 are spaced apart on the first flange 11 and the second flange 21. A threaded sleeve 18 is fixedly disposed below the bolt holes 17 on the first flange 11. Bolts pass through the bolt holes 17 on the first flange 11 and the second flange 21 and are screwed to the threaded sleeve 18.

[0068] Specifically, both the first flange 11 and the second flange 21 have multiple bolt holes 17 spaced apart circumferentially. The two sets of bolt holes 17 are positioned one-to-one during assembly for bolt connection. A threaded sleeve 18 is fixedly installed at each bolt hole 17 below the first flange 11. The threaded sleeve 18 is firmly connected to the lower surface of the flange by welding and is coaxial with the bolt hole 17.

[0069] During installation, the bolts pass through the corresponding bolt holes 17 on the second flange 21 and the first flange 11 in sequence, and are directly screwed into the corresponding threaded sleeves 18. The bolts are then tightened by thread to achieve a tight connection between the two flanges.

[0070] Installation method: First, use mechanical pressure to vertically drive the pile sleeve 12 in the base 1 into the ground. During the pressing process, the soil cutting edge 16 of the pile sleeve 12 assists in breaking the soil, while the wing plate 14 provides initial embedding and stabilizing effect.

[0071] Subsequently, the tool head is inserted into the cross groove 32 at the upper end of the screw block 3 using a matching drive device (such as an electric wrench). The pile body 2 is driven to spiral into the stratum along the assembly hole 13 by rotation. The spiral blade 24 assists in cutting the soil during rotation, so that the pile body 2 can smoothly penetrate into the ground, forming effective frictional resistance and embedment force, and improving its pull-out resistance.

[0072] Next, align the second flange 21 of the pile body 2 with the first flange 11 of the base 1, insert the bolt through the bolt hole 17, and let it pass through the two flanges and screw it into the threaded sleeve 18 below the first flange 11 to complete the fastening connection between the flanges.

[0073] Finally, open the swivel block 3 and inject mortar into the cavity of the pile body 22 through the swivel hole 25 on the second flange 21. The mortar diffuses to the surrounding soil layer through multiple grouting holes 26 in the pile body 22, forming a wrap-around reinforcement area and improving the pile-soil bond strength.

[0074] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A prefabricated helical ground pile, characterized in that, include: The base (1) includes a first flange (11) and a pile sleeve (12), the pile sleeve (12) being connected to the first flange (11), and assembly holes (13) being provided on the pile sleeve (12) and the first flange (11), and the pile sleeve (12) being adapted to penetrate into the soil. The pile body (2) includes: a second flange (21), a pile body (22) and a pile head (23). One end of the pile body (22) is connected to the second flange (21), and the other end is connected to the pile head (23). The outer wall of the pile body (22) is provided with a plurality of spiral blades (24) spaced apart along its axial direction. The first flange (11) and the second flange (21) are detachably connected. The pile body (2) is adapted to be screwed into the soil from the assembly hole (13) under the drive of external force.

2. The prefabricated helical pile according to claim 1, characterized in that, The second flange (21) has a swivel hole (25), the pile body (22) has a cavity with one end open, the swivel hole (25) communicates with the cavity, and the pile body (22) has a plurality of grouting holes (26).

3. The prefabricated helical pile according to claim 2, characterized in that, A detachable rotating block (3) is provided on the rotating hole (25).

4. The prefabricated helical pile according to claim 3, characterized in that, The outer wall of the rotating block (3) is provided with a plurality of locking teeth (31) spaced apart along its circumference, and the outer periphery of the rotating hole (25) is provided with a plurality of locking grooves (27) spaced apart along its circumference, and the locking teeth (31) are adapted to engage with the locking grooves (27).

5. The prefabricated helical pile according to claim 4, characterized in that, The rotating block (3) is provided with a cross groove (32) suitable for connection with the driving device.

6. The prefabricated helical pile according to claim 1, characterized in that, The outer wall of the pile sleeve (12) is provided with a plurality of wing plates (14) spaced apart along its circumference, and the wing plates (14) are connected to the first flange (11).

7. The prefabricated helical pile according to claim 6, characterized in that, A pull-out plate (15) is provided on the wing plate (14), the bottom end of the pull-out plate (15) is connected to the wing plate (14), and the pull-out plate (15) is set at an angle to the wing plate (14).

8. The prefabricated helical pile according to claim 7, characterized in that, The wing plate (14) and the pile sleeve (12) have an acute-angled cutting edge (16) at the end away from the first flange (11).

9. The prefabricated helical pile according to claim 8, characterized in that, The dimensions of the wing plate (14) gradually decrease from the end closest to the pile sleeve (12) to the end furthest from the pile sleeve (12).

10. The prefabricated helical pile according to claim 1, characterized in that, The first flange (11) and the second flange (21) are provided with a plurality of bolt holes (17) spaced apart. A threaded sleeve (18) is fixedly provided below the bolt holes (17) of the first flange (11). The bolt passes through the bolt holes (17) on the first flange (11) and the second flange (21) and is screwed to the threaded sleeve (18).

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