Anti-pullout pile device

Abstract

The application relates to the technical field of building construction, and discloses an uplift pile device, which comprises an uplift pile tip main body, an uplift piece arranged on the uplift pile tip main body, an anchor rod body arranged in the uplift pile tip main body, and core concrete arranged in the uplift pile tip main body; the uplift piece is used for transmitting the upward pulling force to the uplift pile tip main body; the anchor rod body is used for connecting the uplift piece and transmitting the pulling force to a bearing platform; and the core concrete is used for covering the anchor rod body and bonding with a pile body to form an integral force transmission structure; the device is reliable in connection, effective in uplift resistance, and suitable for foundation engineering of buildings, bridges and the like which need to resist the upward pulling force.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to an anti-uplift pile device. Background Technology

[0002] With the development of civil engineering technology, tension piles are increasingly widely used in high-rise buildings, bridge projects, port facilities, and underground structures to perform anti-buoyancy and anti-tension functions. Conventional tension piles mainly rely on the side friction between the pile body and the surrounding soil to resist axial tensile force, and can be divided into two categories according to construction technology: cast-in-place piles and precast piles.

[0003] In engineering practice, for cast-in-place piles, it is usually necessary to form a support plate or enlarged base structure on the pile side or pile end to improve the tensile bearing capacity. However, this process has drawbacks such as large deviations in the dimensions of the support plate / enlarged base due to the influence of construction conditions, insufficient stability of on-site casting quality, long construction period, and high overall cost. Precast piles have the advantages of controllable pile quality, high pile strength, environmentally friendly construction, and good durability in corrosive environments. However, the main problem with using precast piles for tensile testing is the reliability of the joint connection. The connection between pile segments relies on mechanical joints or welded joints, and their reliability is limited by the on-site construction level, which can easily create weak points in force transmission. Currently, there is no unified and reliable standard for joints specifically used for tensile testing precast piles. Although it is stipulated that tensile testing pipe piles should use special mechanical joints or special welded joints, the lack of unified process specifications makes it difficult to guarantee the durability of the joints.

[0004] Therefore, there is an urgent need for a reliable and effective pull-out pile device. Summary of the Invention

[0005] This invention is made to solve the above-mentioned technical problems. Its purpose is to provide an anti-tension pile device to effectively solve the problems of unreliable joint connection, insufficient durability in corrosive environments, and inability to fully utilize the side friction resistance of the entire pile length in the application of existing precast piles for anti-tension, thereby improving the durability performance of the pile foundation.

[0006] To achieve the above objectives, the present invention provides an anti-tension pile device, comprising: an anti-tension pile tip body, an anti-tension member disposed on the anti-tension pile tip body, an anchor rod body disposed within the anti-tension pile tip body, and core-filled concrete disposed within the anti-tension pile tip body; wherein... The pull-out resisting member is used to transfer the pull-out force to the pull-out resisting pile tip body; The anchor body is used to connect the pull-out member and transmit the tensile force to the bearing platform; The core-filled concrete is used to cover the anchor rod body and bond it to the pile body to form an integral force-transmitting structure.

[0007] Preferably, the main body of the tension pile tip includes: a plurality of precast pipe piles and a tension pile tip; wherein, The precast pipe pile includes: a concrete pile body, a pile body cavity axially extending through the concrete pile body, and a connecting end plate disposed at the end of the concrete pile body. The anti-uplift pile tip is located at the bottom of the precast pipe pile; The pull-out pile tip includes: a first steel plate and a second steel plate that cross and are perpendicular to each other, and a pile tip plate welded to the top of the steel plates; The pull-out pile tip is used to penetrate the soil layer and provide pull-out support.

[0008] Preferably, a drilled hole is provided on the tip plate of the pile, and a nut is provided at the lower end of the pull-out member; The pull-out resisting element is inserted into the borehole; The nut is used to fix the pull-out member to the tip plate of the pile.

[0009] Preferably, the anchor rod body is vertically disposed within the pile body; The bottom of the anchor rod body overlaps with the pull-out member, and the top of the anchor rod body extends to the bearing platform for anchoring.

[0010] Preferably, a corrugated pipe is pre-embedded in the inner wall of the concrete pile body, wherein, The corrugated pipe is installed along the entire length of the inner wall of the concrete pile. The corrugated pipe is used to increase the contact area between the core concrete and the pile body.

[0011] Preferably, the pull-out pile tip is a cross-shaped pile tip or a conical pile tip.

[0012] Preferably, the anchor rod body is a steel strand or a threaded steel bar.

[0013] Preferably, the anti-uplift pile tip is welded and fixed to the connecting end plate.

[0014] Preferably, a chamfer is provided at the intersection of the first steel plate and the second steel plate.

[0015] Preferably, the pull-out resisting member is a U-shaped steel bar.

[0016] Based on the above description and practice, it can be seen that the anti-tension pile device of the present invention has the following advantages compared with the traditional anti-tension pile device: 1. By replacing the traditional pile segment joint with an integrated pile tip structure, weak points in machinery and welding are eliminated, avoiding the risk of joint failure in corrosive environments; 2. The core-filled concrete encapsulates the anchoring components to form a sealed barrier, blocking the intrusion path of corrosive media; 3. The overlapping design of the anchor body and the pull-out member, combined with the synergistic bonding effect of the core concrete and the corrugated pipe, enables the integrated pile tip to transfer the pull-out force to the entire pile body, giving full play to the side friction resistance of the entire pile body and improving the pull-out bearing capacity of the foundation pile. Attached Figure Description

[0017] Figure 1 This is a composition diagram of a precast pipe pile involved in one embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of an anti-pull-out precast pipe pile involved in one embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of an anti-uplift pile tip in one embodiment of the present invention.

[0020] The attached figures are labeled as follows: 1. Precast pipe pile; 11. Concrete pile body; 12. Pile body cavity; 13. Connecting end plate; 14. Corrugated pipe; 2. Tension-resistant pile tip; 211. First steel plate; 212. Second steel plate; 22. Pile tip plate; 3. Tension-resistant component; 31. Tension-resistant part; 32. Nut; 4. Anchor rod body; 5. Core-filled concrete. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0022] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0023] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] This embodiment discloses an anti-pull-out pile device. Figure 1 The combined structure of the precast pipe pile is shown. Figure 2 The overall structure of the pull-out precast pipe pile is shown; Figure 3 The overall structure of the anti-uplift pile tip is shown.

[0025] Please refer to Figures 1 to 3 This invention relates to an anti-tension pile device, and the specific implementation process is described in detail below with reference to the accompanying drawings and embodiments. An anti-tension pile device includes: an anti-tension pile tip body, an anti-tension component 31, an anchor rod body 4, and core-filled concrete 5. The anti-tension component 3 is fixedly mounted on the anti-tension pile tip body. The anti-tension component 31 penetrates the pile tip plate 22 and is mechanically locked by a nut 32, forming a rigid connection node that directly transmits the pull-out force from the soil layer to the anti-tension pile tip body. The anchor rod body 4 is vertically disposed inside the pile body cavity 12. The bottom of the anchor rod body 4 is fixedly connected to the anti-tension component 31 by steel reinforcement lap or welding, and the top extends into the pile cap, meeting the anchorage length requirements, thus forming a complete force transmission path from the pile tip to the pile cap. The core-filled concrete 5 is poured into the anti-tension pile tip body. After the anchor rod body 4 is installed, core-filling is performed within the cavity 12 of the anti-tension pile tip body. The core-filled concrete 5 can be poured along the entire length of the anti-tension pile tip body or only partially poured at the pile bottom and pile top of the anti-tension pile tip body. In specific embodiments, micro-expansion, non-shrinkage concrete is generally used. After hardening, it covers the anchor body 4 and penetrates the uneven surface of the pre-embedded corrugated pipe 14, forming an interlocking connection with the inner wall of the concrete pile body 11. This allows the tension pile tip, anchor body 4, and core concrete 5 to interact and form an integrated force transmission structure. This disclosure significantly improves the transmission efficiency of tension loads through the combined effect of physical bonding and mechanical connection.

[0026] Furthermore, the tensile pile tip body 2 is composed of a precast pipe pile 1 and a tensile pile tip 2. The precast pipe pile 1 includes a cylindrical concrete pile body 11, an axially penetrating pile body cavity 12, and an annular connecting end plate 13 at the end. The inner wall of the concrete pile body 11 of the bottom section is pre-embedded with a corrugated pipe 14 to enhance interface bonding. The tensile pile tip 2 is welded and fixed to the bottom of the precast pipe pile 1. It is formed by perpendicularly welding a first steel plate 211 and a second steel plate 212 to form a cross-shaped support frame. In this embodiment, the intersection of the first steel plate 211 and the second steel plate 212 is cut at a 30° angle to reduce pile driving resistance. The pile tip plate 22 is a circular steel plate with a diameter matching the connecting end plate 13. It is fixed to the top of the cross-shaped support frame by welding, forming a tensile support system with tip penetration function. This structure provides soil penetration capability during pile driving, and provides additional resistance during upward pull through the interaction between the first steel plate 211 and the second steel plate 212 and the soil.

[0027] Furthermore, the pull-out resisting component 3 includes a pull-out resisting member 31 and a nut 32 disposed at the lower end of the pull-out resisting member 31. A borehole is drilled in the central area of ​​the pile tip plate 22. The pull-out resisting member 31 is made of U-shaped steel bars, and the spacing of its vertical legs is adapted to the borehole diameter. During installation, the two vertical legs of the pull-out resisting member 31 are first passed through the borehole from bottom to top. Then, a high-strength nut 32 is installed below the pile tip plate 22 and tightened with torque, so that the bottom bent section of the U-shaped steel bar is tightly attached to the lower surface of the pile tip plate 22. The mating length between the nut 32 and the steel bar thread is not less than 1.5 times the steel bar diameter to ensure that it does not loosen under repeated loading. This mechanical connection method allows the pull-out force to be directly transmitted to the pile tip plate 22 through the vertical legs of the pull-out resisting member 31, avoiding the risk of aging failure of traditional welded joints.

[0028] Furthermore, the bottom of the pull-out member 31 is provided with threads. The pull-out member 31 passes through the pile tip plate 22 and is fixedly connected to the pile tip plate 22 with the nut 32, thereby realizing the integration of the pull-out pile tip body.

[0029] Furthermore, the drilling and pull-out resistance components 31 can be configured in several ways according to the force that the pile is locked to enhance the overall pull-out resistance of the pile.

[0030] Furthermore, when the first steel plate 211 and the second steel plate 212 are cross-welded, the drill holes on the pile tip plate 22 should be avoided to prevent the edge of the bottom thread of the pull-out member 31 from contacting the edge of the first steel plate 211 and the second steel plate 212 when it is fixed on the pile tip plate 22 with the nut 32, which would affect the connection and fixation of the pull-out member 31.

[0031] Furthermore, the anchor body 4 is made of steel strand or threaded steel bar. The bottom of the anchor body 4 is connected to the pull-out member 31 to meet the lap joint requirements, and the top meets the tensile anchorage length requirements within the pile cap. Steel strand is suitable for high load-bearing capacity applications, while threaded steel bar is suitable for areas with lower corrosion risk. When using threaded steel bar, additional anti-corrosion measures, such as coating protection or anti-corrosion additives, must be taken. During construction, the anchor body 4 is hoisted into the pile cavity 12. The bottom of the anchor body 4 is connected to the U-shaped horizontal section of the pull-out member 31 by lap binding or grooving welding. The top extends beyond the pile top and is equipped with a threaded end. After the core concrete 5 reaches the construction standard strength, the anchor body 4 can be tensioned and locked to anchor the anchor member 4 into the pile cap, thus exerting the overall pull-out resistance of the foundation pile. The anchor body 4 is bonded to the concrete to form a whole, so that the pull-out force is evenly distributed throughout the entire pile section, effectively stimulating the side friction resistance of the deep soil.

[0032] Furthermore, a corrugated pipe 14 is installed along the axial length of the inner wall of the concrete pile body 11 of the bottom precast pipe pile 1. This corrugated pipe 14 is embedded during factory casting, its outer surface bonded to the concrete pile body 11, forming a continuous concave-convex interface within its inner cavity. During core grouting, the micro-expansion concrete flows into the gaps between the corrugated pipes 14, and after hardening, forms a mechanically interlocking structure. This increases the contact area between the core concrete 5 and the concrete pile body 11, improves the interfacial bond strength, and significantly enhances load transfer efficiency.

[0033] Furthermore, in this embodiment, the pull-out pile tip 2 is a cross-shaped pile tip, and further, the pile tip is also set as a conical pile tip. Generally, the cross-shaped pile tip is made of intersecting steel plates and is suitable for general soil layers; the conical pile tip is welded from conical steel plates and is suitable for dense soil layers or soft rock layers. Both forms are treated with anti-corrosion measures to adapt to corrosive environments.

[0034] Furthermore, the tip plate 22 of the anti-tension pile tip 2 is fixed to the connecting end plate 13 of the precast pipe pile 1 by welding. The welding adopts a multi-layer welding process, and non-destructive testing is carried out after welding to ensure quality. The weld area is coated with an anti-corrosion coating to extend durability.

[0035] Furthermore, the first steel plate 211 and the second steel plate 212 are provided with a chamfered structure at their intersection area to reduce pile driving resistance by optimizing the geometry. The chamfered edges are rounded to avoid stress concentration and ensure structural integrity.

[0036] Furthermore, in the fabrication of this disclosure, the first step is to drill a through hole in the pile tip plate of the pull-out pile tip, and then pass the vertical leg of the U-shaped pull-out member 31 through from bottom to top. A pre-tightening force is applied below the pile tip plate 22 using a locking nut 32 to complete the rigid connection. Subsequently, the integrated pile tip is assembled by welding the tops of the cross-arranged first steel plate 211 and second steel plate 212 to the pile tip plate 22. The pile tip plate 22 is then welded to the end plate 13 of the bottom section of the pile tube to form an integrated pile tip. This is then manufactured as a single pile segment for shipment, reducing on-site workload. Furthermore, the pile tip can be covered with concrete or steel plates to form a "pencil pile" to enhance corrosion resistance. During the pile driving stage, a vibratory hammer or static pressure equipment is used to drive the bottom section of the pipe pile with the integrated pile tip to the design elevation. The upper section of the pipe pile is then spliced ​​section by section to the design pile length through end plate welding or mechanical joints. During installation, the anchor rod 4 is hoisted into the pile cavity 12. The bottom of the anchor rod 4 is overlapped and bound or welded to the U-shaped section of the pull-out member 31, and the top extends beyond the pile top to the reserved anchorage length for the bearing platform. Finally, core grouting and tensioning are performed. Micro-expansion core grouting concrete 5 is poured into the pile cavity 12. After the core grouting concrete 5 reaches the design strength, prestress is applied to the anchor rod 4 and it is locked to the bearing platform. Throughout the process, the concave-convex interface formed by the pre-embedded corrugated pipe enhances the concrete interlocking, and the anchor tensioning eliminates the connection gap, ensuring the integrity and reliability of the force transmission path.

[0037] In summary, this disclosure improves the tensile strength of the foundation pile by setting an anchor body 4 inside the cavity 12 of the precast pipe pile 1 and transferring the pull-out force to the tensile pile tip 2 through the injected core concrete 5, thereby stimulating the side friction resistance of the entire concrete pile body 11. Furthermore, by adopting the core-filling process of the pile body cavity 12, the core concrete 5 covers the anchor body 4 and fills the internal pores, achieving synergistic internal and external forces. This not only solves the reliability defects of the traditional precast pile connection end plate 13, but also blocks the intrusion path of corrosive media and improves the durability of the pile foundation. Then, a corrugated pipe 14 is pre-embedded in the inner wall of the concrete pile body 11 of the bottom section of the precast pipe pile 1. Its concave and convex surfaces form a mechanical interlock with the core concrete 5, increasing the contact area and significantly improving the interfacial bonding strength. In order to be applicable to prestressed and ordinary precast hollow piles, the tensile pile tip 2 is designed as a cross-shaped or conical structure according to the soil characteristics, optimizing the pile driving resistance and tensile performance.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An anti-pull-out pile device, characterized in that, include: The structure comprises: a tension pile tip body, a tension-resistant component mounted on the tension pile tip body, an anchor rod body disposed within the tension pile tip body, and core-filled concrete disposed within the tension pile tip body; wherein... The pull-out component is used to transfer the pull-out force to the pull-out pile tip body; The anchor body is used to connect the pull-out resisting component and transmit the tensile force to the bearing platform; The core-filled concrete is used to cover the anchor rod body and bond it to the pile body to form an integral force-transmitting structure.

2. The anti-pull-out pile device as described in claim 1, characterized in that, The main body of the tension-resistant pile tip includes: several precast pipe piles and a tension-resistant pile tip; wherein... The precast pipe pile includes: a concrete pile body, a pile body cavity axially extending through the concrete pile body, and a connecting end plate disposed at the end of the concrete pile body. The anti-uplift pile tip is located at the bottom of the precast pipe pile; The pull-out pile tip includes: a first steel plate and a second steel plate that cross and are perpendicular to each other, and a pile tip plate welded to the top of the steel plates; The pull-out pile tip is used to penetrate the soil layer and provide pull-out support.

3. The anti-pull-out pile device as described in claim 2, characterized in that, The pull-out resistance assembly includes: a pull-out resistance member and a nut disposed at the lower end of the pull-out resistance member; A drilled hole is provided on the tip plate of the pile; The pull-out resisting element is inserted into the borehole; The nut is used to fix the pull-out member to the tip plate of the pile.

4. The anti-pull-out pile device as described in claim 3, characterized in that, The anchor rod body is vertically installed inside the concrete pile body; The bottom of the anchor rod body overlaps with the pull-out member, and the top of the anchor rod body extends to the bearing platform for anchoring.

5. The anti-pull-out pile device as described in claim 2, characterized in that, A corrugated pipe is pre-embedded in the inner wall of the concrete pile, wherein... The corrugated pipe is installed along the entire length of the inner wall of the concrete pile. The corrugated pipe is used to increase the contact area between the core concrete and the pile body.

6. The anti-pull-out pile device as described in claim 2, characterized in that, The anti-uplift pile tip is a cross-shaped pile tip or a conical pile tip.

7. The anti-pull-out pile device as described in claim 1, characterized in that, The anchor rod body is a steel strand or a threaded steel bar.

8. The anti-pull-out pile device as described in claim 2, characterized in that, The anti-uplift pile tip is welded and fixed to the connecting end plate.

9. The anti-pull-out pile device as described in claim 2, characterized in that, A chamfer is provided at the intersection of the first steel plate and the second steel plate.

10. The anti-pull-out pile device as described in claim 3, characterized in that, The pull-out resisting element is a U-shaped steel bar.

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