Composite material pile tip structure, pipe pile and its preparation method

Abstract

This application relates to a pile tip structure for composite material piles, a pipe pile, and a method for manufacturing the same. The pile tip structure includes a metal ring and a pile tip body. One axial end of the metal ring is connected to the pile body of the composite material pile, and the other axial end of the metal ring is connected to the pile tip body. The pile tip body is coaxially arranged with the metal ring. The pile tip body has a conical structure, and the diameter of the end of the pile tip body away from the metal ring is smaller than the diameter of the end of the pile tip body near the metal ring. The composite material pipe pile includes a pile body and a pile tip structure connected to the pile body. The pile body includes an inner structural layer and an outer structural layer. The pile tip structure facilitates the sinking of the pile body during pile driving. The metal ring is connected to the composite material pile body, and the portion of the metal ring extending out of the pile body is connected to the pile tip body, facilitating quick and easy fixing of the pile tip body to the pile body. This method eliminates the need for drilling into the pile body, avoiding the impact of drilling on the strength of the composite material pile body.

Description

Technical Field

[0001] This application relates to the field of composite material pipe pile technology, and in particular to a pile tip structure of a composite material pile, a pipe pile and a method for preparing the same. Background Technology

[0002] In my country's coastal areas, many large bridge and port projects utilize steel pipe piles and prestressed concrete pipe piles as foundation treatment measures. Steel pipe piles offer advantages such as strong penetration, high bearing capacity, minimal soil displacement effect, convenient splicing, strong horizontal bending resistance, and light lifting weight; however, they are susceptible to corrosion and are expensive. Prestressed concrete precast pipe piles offer advantages such as low cost, convenient splicing, short construction period, and easily guaranteed precast quality; however, they have high transportation costs, poor horizontal bending resistance, and poor corrosion resistance.

[0003] Currently, composite material pipe piles have appeared on the market. The pile body is made of composite materials such as fiberglass. Composite materials have advantages such as light weight, high strength and corrosion resistance. However, the pile ends of composite material pipe piles are not resistant to impact during piling, which can easily cause damage to the composite material pipe piles. Summary of the Invention

[0004] To improve the convenience of driving composite material pipe piles and reduce direct impact on the ends of the composite material pipe piles, this application provides a pile tip structure of a composite material pile, a pipe pile, and a method for its preparation.

[0005] In a first aspect, this application provides a pile tip structure for a composite material pile, comprising a metal ring and a pile tip body. One axial end of the metal ring is used to connect with the pile body of the composite pile, and the other axial end of the metal ring is connected with the pile tip body. The pile tip body is coaxially arranged with the metal ring. The pile tip body has a conical structure, and the diameter of the end of the pile tip body away from the metal ring is smaller than the diameter of the end of the pile tip body close to the metal ring.

[0006] The above technical solution involves connecting a cone-shaped pile tip structure to the pile body, which facilitates the sinking of the pile body during pile driving. A metal ring is installed to connect with the composite material pile body, with the part of the metal ring extending out of the pile body connected to the pile tip body. This allows for quick and easy fixing of the pile tip body to the pile body. Furthermore, this method eliminates the need for drilling into the pile body, thus avoiding the impact of drilling on the strength of the composite material pile body.

[0007] In a specific and feasible solution, the metal rings are segmented in the circumferential direction, and the segments are connected by snap-fit.

[0008] The above technical solution involves setting the metal rings into a segmented structure, which facilitates the installation of the metal rings into the pile body.

[0009] In one feasible embodiment, serrations are provided on the outer circumferential surface of the metal ring.

[0010] By using the above technical solution, convex teeth are provided on the outer circumferential surface of the metal ring, which makes the connection between the metal ring and the pile body more reliable.

[0011] In one feasible embodiment, a protruding retaining ring is provided on the inner circumferential surface of the metal ring.

[0012] The above technical solution, by setting a retaining ring, allows the ring to be inserted into the installation groove inside the pile body, further increasing the reliability of the connection between the metal ring and the pile body.

[0013] In a specific feasible solution, the pile tip body is inserted into the metal ring plate, and the pile tip body and the metal ring plate are also fixed by welding, bolting or snap-fit ​​connection.

[0014] Through the above technical solutions, the pile tip body and the metal ring are fixed by welding, bolting or snap-fit ​​connection, thereby achieving a reliable connection between the pile tip and the pile body.

[0015] In a specific feasible solution, a support rib is also provided on the outer peripheral surface of the pile tip body.

[0016] The above technical solution ensures the strength of the pile tip body by setting support ribs on the outer circumference of the pile tip body.

[0017] Secondly, this application provides a composite material pipe pile, including a pile body and a pile tip structure connected to the pile body; the pile body includes an inner structural layer and an outer structural layer, and the pile tip structure is installed between the inner structural layer and the outer structural layer, wherein the pile tip structure is the aforementioned pile tip structure.

[0018] Through the above technical solution, the composite material pipe pile, by setting a pile tip structure, facilitates the sinking of the pile body during pile driving. At the same time, the pile tip structure is installed between the inner and outer structural layers, making the pile tip structure and the pile body structure firmly fixed, and eliminating the need to drill holes in the pile body, thus avoiding the impact of drilling on the strength of the composite material pile body.

[0019] In one feasible implementation, an annular groove is provided on the outer peripheral surface of the inner structural layer.

[0020] The above technical solution improves the connection stability between the metal ring and the pile by setting an annular groove on the outer circumference of the inner structural layer, which facilitates the snap ring on the metal ring to be engaged in the annular groove.

[0021] Thirdly, this application provides a method for preparing composite material pipe piles, comprising the following steps:

[0022] S1. The composite material fiber fabric or direct yarn is impregnated with resin and wound around the mandrel to form an inner structural layer;

[0023] S2. Install metal rings on the inner structural layer. Install one axial end of the segmented metal rings onto the outer circumferential surface of the inner structural layer, and make the inner circumferential surface of the metal rings fit against the outer circumferential surface of the inner structural layer. The outer circumferential surface of the metal rings has protruding teeth, and the other axial end of the metal rings extends out of the inner structural layer.

[0024] S3. Composite fiber fabric or direct yarn is impregnated with resin and wound around the inner structural layer and metal ring to form the outer structural layer.

[0025] S4. Demolding: Remove the inner and outer structural layers from the core mold and take them off.

[0026] S5. Install the pile tip onto the part of the metal ring that extends out of the inner structural layer.

[0027] Through the above technical solution, the pile body is prepared by the method of composite material fiber winding to prepare the inner structural layer, then metal rings are placed on the inner structural layer, and finally the outer structural layer is formed by winding. The metal rings can be well fixed between the inner and outer structural layers of the pile body. Moreover, by using the winding method, the metal rings can be well fixed to the pile body without drilling holes. The metal rings facilitate the installation of the pile head onto the metal rings.

[0028] In one specific implementation, after preparing the inner structural layer in step S1, the inner structural layer is further trimmed to form an annular groove on the outer peripheral surface of the inner structural layer.

[0029] The above technical solution involves shaping an annular groove on the outer circumference of the inner structural layer, which facilitates the insertion of the retaining ring on the metal ring into the annular groove. This prevents the metal ring from shifting or displacing axially with the structural layer, thereby improving the connection stability between the metal ring and the pile.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. This application connects a pile tip structure to the pile body. The pile tip structure is a conical structure, which facilitates the sinking of the pile body during pile driving. By setting a metal ring to connect with the composite material pile body, the part of the metal ring extending out of the pile body is connected to the pile tip body. This facilitates the quick and easy fixing of the pile tip body to the pile body. At the same time, this method eliminates the need to drill holes in the pile body, avoiding the impact of drilling on the strength of the composite material pile body.

[0032] 2. The pile body is prepared by the fiber winding of composite materials to form the inner structural layer. Then, metal rings are placed on the inner structural layer, and finally, the outer structural layer is formed by winding. This can fix the metal rings well between the inner and outer structural layers of the pile body. Moreover, by using the winding method, the metal rings can be well fixed to the pile body without drilling holes. The metal rings facilitate the installation of the pile head onto the metal rings.

[0033] 3. By setting an annular groove on the inner structural layer of the pile and a retaining ring on the inner circumference of the metal ring, a tight axial connection between the metal ring and the inner structural layer is achieved, preventing axial movement or displacement. Raised teeth are set on the outer circumference of the metal ring; when the outer structural layer is wound, the composite material fibers wrap around the gaps between the raised teeth, thus providing axial restraint between the metal ring and the outer structural layer, further improving the stability of the connection between the metal ring and the pile. This ensures the stability of the connection between the metal ring and the pile even under axial impact forces during pile driving. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the pile tip structure of Embodiment 1 of this application.

[0035] Figure 2 This is a schematic diagram of the structure of the metal ring plate in Embodiment 1 of this application;

[0036] Figure 3 This is a structural schematic diagram of the composite material pipe pile of Embodiment 1 of this application.

[0037] Figure 4 This is a cross-sectional view of the composite material pipe pile of Embodiment 1 of this application.

[0038] Figure 5 This is a schematic diagram of the composite material pipe pile fabrication process according to Embodiment 1 of this application.

[0039] Figure 6 This is a schematic diagram of the structure of the metal ring sheet in Embodiment 2 of this application.

[0040] Figure 7 This is a cross-sectional view of the composite material pipe pile of Embodiment 2 of this application.

[0041] Figure 8 This is a schematic diagram of the composite material pipe pile fabrication process according to Embodiment 2 of this application.

[0042] Figure 9 This is a diagram illustrating the connection structure between the metal ring and the pile tip body in Embodiment 3 of this application.

[0043] The following are the reference numerals in the attached drawings: 1. Pile body; 2. Metal ring; 3. Pile tip body; 4. Core mold; 5. Insertion groove; 6. Stop block; 7. Locking block; 11. Inner structural layer; 12. Outer structural layer; 111. Annular groove; 21. Locking ring; 22. Protruding tooth; 23. Plug; 24. Socket; 31. Support rib; 51. Longitudinal groove; 52. Transverse groove. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0045] Example 1:

[0046] Reference Figure 1 and Figure 2 This embodiment discloses a pile tip structure for a composite material pile, including a metal ring 2 and a pile tip body 3. The metal ring 2 has a two-segment structure in the circumferential direction, and the two segments of the metal ring 2 are fixedly connected by a plug 23 and a socket 24. Raised teeth 22 are provided on the outer circumferential surface of the metal ring 2. The raised teeth 22 are distributed in a ring shape, and multiple teeth are distributed in the axial direction of the metal ring 2. The raised teeth 22 are located on one side of the axial direction of the metal ring 2, and this side of the metal ring 2 is used to connect with the composite pile body. From the cross-sectional view, the multiple raised teeth 22 of the metal ring 2 form a serrated structure.

[0047] The other end of the metal ring 2, that is, the end without the protruding teeth 22, is connected to the pile tip body 3. The pile tip body 3 is coaxially arranged with the metal ring 2. The pile tip body 3 has a conical structure and is made of metal. In this embodiment, the pile tip body 3 is a conical ring. The diameter of the end of the pile tip body 3 away from the metal ring 2 is smaller than the diameter of the end of the pile tip body 3 close to the metal ring 2. In this embodiment, one end of the pile tip body 3 is inserted into the metal ring 2 and is fixed to the metal ring 2 by welding or screw connection.

[0048] Support ribs 31 are also provided on the outer conical surface of the pile tip body 3. Considering the diameter of the pile tip body 3, about 6-8 support ribs 31 are provided to increase the strength of the pile tip body 3.

[0049] This embodiment also discloses a composite material pipe pile, referring to... Figure 3 and Figure 4 The system includes a pile body 1 and a pile tip structure connected to the pile body 1. In this embodiment, the pile body 1 is made of fiberglass, and the pile tip structure is as described above. Figure 1 The pile tip structure includes an inner structural layer 11 and an outer structural layer 12. In the pile tip structure, one end of a metal ring 2 with protruding teeth 22 is installed between the inner structural layer 11 and the outer structural layer 12, and the other end of the metal ring 2 extends out of the pile body 1.

[0050] Reference Figure 5 This embodiment also discloses a method for preparing the above-mentioned composite material pipe pile, including the following steps:

[0051] S1. Impregnate the composite fiber fabric or direct yarn with resin and wind it onto the mandrel 4 to form the inner structural layer 11.

[0052] S2. Install metal rings 2 on the inner structural layer 11. Install the two sections of metal rings 2 onto the inner structural layer 11. The inner circumferential surface of the metal rings 2 is in close contact with the outer circumferential surface of the inner structural layer 11. During installation, one end of the protruding teeth 22 on the metal rings 2 is completely distributed on the inner structural layer 11, and the part of the metal rings 2 that extends out of the inner structural layer 11 does not have protruding teeth 22.

[0053] S3. A composite material fiber fabric or direct yarn is impregnated with resin and wound around the inner structural layer 11 and the metal ring 2 to form the outer structural layer 12.

[0054] S4. Demolding: Remove the inner structural layer 11 and the outer structural layer 12 from the core mold 4.

[0055] S5. Install the pile tip body 3 onto the part of the metal ring plate 2 that extends out of the inner structural layer. During installation, one end of the pile tip body 3 is inserted into the metal ring plate 2 and the pile tip body 3 is fixed to the metal ring plate 2 by welding or screw connection.

[0056] Example 2:

[0057] Reference Figure 6 This embodiment discloses a pile tip structure of a composite material pipe pile. The pile tip structure is the same as that of Embodiment 1 except that a protruding retaining ring 21 is provided on the inner circumferential surface of the metal ring 2. The two metal rings 2 are fixedly connected by a plug 23 and a socket 24. The plug 23 and the socket 24 are respectively provided on the retaining rings 21 on the two metal rings 2.

[0058] Reference Figure 6 and Figure 7 This embodiment also discloses a composite material pipe pile, including a pile body 1 and a pile tip structure connected to the pile body 1. In this embodiment, the pile body 1 is made of fiberglass, and the pile tip structure is as described above. Figure 5 The pile tip structure includes an inner structural layer 11 and an outer structural layer 12. An annular groove 111 is formed on the outer circumferential surface of the inner structural layer 11. The number of annular grooves 111 can be 1-2 depending on actual needs. One end of a metal ring 2 with protruding teeth 22 is installed between the inner structural layer 11 and the outer structural layer 12, so that a retaining ring 21 on the inner circumferential surface of the metal ring 2 is engaged in the annular groove 111. The other end of the metal ring 2 extends out of the pile body 1.

[0059] Reference Figure 8 This embodiment also discloses a method for preparing the above-mentioned composite material pipe pile, including the following steps:

[0060] S1. Impregnate the composite fiber fabric or direct yarn with resin and wind it onto the mandrel 4 to form an inner structural layer 11; and trim an annular groove 111 on the outer peripheral surface of the inner structural layer 11 near the end.

[0061] S2. Install metal rings 2 on the inner structural layer 11. Install the two sections of metal rings 2 onto the inner structural layer 11. During the installation process, the retaining rings 21 on the inner circumferential surface of the metal rings 2 need to be distributed on the annular amine grass 111. The inner circumferential surface of the metal rings 2 is in close contact with the outer circumferential surface of the inner structural layer 11. During installation, one end of the toothed portion 22 on the metal rings 2 is completely distributed on the inner structural layer 11, and the portion of the metal rings 2 extending out of the inner structural layer 11 does not have toothed portions 22.

[0062] S3. A composite material fiber fabric or direct yarn is impregnated with resin and wound around the inner structural layer 11 and the metal ring 2 to form the outer structural layer 12.

[0063] S4. Demolding: Remove the inner structural layer 11 and the outer structural layer 12 from the core mold 4.

[0064] S5. Install the pile tip body 3 onto the part of the metal ring plate 2 that extends out of the inner structural layer. During installation, one end of the pile tip body 3 is inserted into the metal ring plate 2 and the pile tip body 3 is fixed to the metal ring plate 2 by welding or screw connection.

[0065] Example 3:

[0066] Reference Figure 9 In this embodiment, the rest is the same as in Embodiment 1 or Embodiment 2. The difference is that when the pile tip body 3 is connected to the metal ring 2 in this embodiment, the connection is achieved through the following structure: an insertion groove 5 is provided at the end of the metal ring 2 away from the pile body 1. The insertion groove 5 is an L-shaped structure, consisting of a transverse groove 52 and a longitudinal groove 51. A receiving groove is provided on the groove wall at the junction of the longitudinal groove 51 and the transverse groove 52, moving away from the longitudinal groove. A stop block 6 that can extend out of the receiving groove 53 is provided in the receiving groove. In its natural state, the stop block 6 extends into the insertion groove 5. Under the action of external force, the stop block 6 can retract into the receiving groove 53. 4-8 insertion grooves 5 are provided circumferentially on the metal ring 2.

[0067] A number of locking blocks 7, the same as the number of insertion slots 5, are provided on one end of the pile tip body 3 that connects to the metal ring 2. When it is necessary to connect the pile tip body 3 and the metal ring 2, the locking block 7 at one end of the pile tip body 3 is inserted into the metal ring 2 along the longitudinal groove 51. During the insertion process, the locking block 7 will press the stop block 6 into the receiving groove. Then, the pile tip body 3 is rotated, and the locking block 7 is screwed into the transverse groove 52. At this time, the pressure of the locking block 7 on the stop block 6 disappears, and it falls back into the insertion slot 5. At this time, the stop block 6 blocks the locking block 7, restricts the rotation of the locking block 7, and fixes the locking block 7 in the transverse groove 52, thereby fixing the pile tip body 3 and the metal ring 2.

[0068] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method of manufacturing a composite pipe pile, characterized by: The utility model relates to a kind of composite material pile, including metal ring piece (2) and pile tip body (3), the metal ring piece (2) axial one end is used to connect with the pile body (1) of composite material pile, metal ring piece (2) axial other end is connected with pile tip body (3);The pile tip body (3) is coaxially arranged with the metal ring piece (2);Pile tip body (3) is conical structure, the diameter of pile tip body (3) far from metal ring piece (2) one end is less than the diameter of pile tip body (3) close to metal ring piece (2) one end; The metal ring piece (2) is segmented structure in circumferential direction, and each segment metal ring piece (2) is connected by clamping connection; The metal ring piece (2) is provided with insertion slot (5) far from pile body (1) one end, and the insertion slot (5) is an L-shaped structure, which is composed of horizontal slot (52) and vertical slot (51), and a receiving groove is arranged on the slot wall of the intersection of the vertical slot (51) and the horizontal slot (52) in a direction away from the vertical slot, and a stop block (6) is arranged in the receiving groove, which can extend out of the receiving groove, in the natural state, the stop block (6) extends into the insertion slot (5), and under the action of external force, the stop block (6) can be received into the receiving groove. The pile tip body (3) is provided with a number of clamping blocks (7) consistent with the insertion slot (5) on the end connected with the metal ring piece (2), when the pile tip body (3) is connected with the metal ring piece (2), the clamping blocks (7) on one end of the pile tip body (3) are inserted into the metal ring piece (2) along the vertical slot (51). A plurality of protrusions (22) are arranged on the outer circumferential surface of the metal ring piece (2). A plurality of protruding clamping rings (21) are arranged on the inner circumferential surface of the metal ring piece (2). The utility model includes the following steps: S1, composite material fiber fabric or direct yarn is immersed in resin, and is wound on the core mold (4) to form an inner structural layer (11); S2, the metal ring piece (2) is installed on the inner structural layer (11), one end of the segmented metal ring piece (2) is installed on the outer circumferential surface of the inner structural layer (11), and the inner circumferential surface of the metal ring piece (2) is attached to the outer circumferential surface of the inner structural layer (11), the outer circumferential surface of the metal ring piece (2) is distributed with protrusions (22), and the other end of the metal ring piece (2) extends out of the inner structural layer (11); S3, composite material fiber fabric or direct yarn is immersed in resin, and is wound on the inner structural layer (11) and the metal ring piece (2) to form an outer structural layer (12); S4, demolding: the inner structural layer (11) and the outer structural layer (12) are separated from the core mold (4) and removed; S5, the pile tip body (3) is installed on the part of the metal ring piece (2) extending out of the inner structural layer (11).

2. The method of manufacturing a composite pipe pile according to claim 1, characterized in that: A plurality of supporting ribs (31) are arranged on the outer circumferential surface of the pile tip body (3).

3. The method of manufacturing a composite pipe pile according to claim 1, wherein: The utility model includes a pile body (1) and a pile tip structure connected with the pile body (1), the pile body (1) includes an inner structural layer (11) and an outer structural layer (12), and the pile tip structure is installed between the inner structural layer (11) and the outer structural layer (12).

4. The method of manufacturing a composite pipe pile according to claim 3, characterized in that: A plurality of annular grooves (111) are arranged on the outer circumferential surface of the inner structural layer.

5. The method of manufacturing a composite pipe pile according to claim 1, wherein: The step S1 of preparing the inner structural layer (11) further includes trimming the inner structural layer (11) to form an annular groove (111) on the outer circumferential surface of the inner structural layer (11).

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