Corrosion-resistant prestressed concrete pipe piles for soft soil foundations

Abstract

This utility model discloses a corrosion-resistant prestressed concrete pipe pile for soft soil foundations, relating to the field of pile foundation technology. The corrosion-resistant prestressed concrete pipe pile for soft soil foundations includes a pile body, a pile tip, a pile cap, and prestressing tendons. The pile body includes a buffer layer, an anti-corrosion layer, and a steel pipe layer distributed radially from the outside to the inside. A pouring cavity for concrete is formed within the steel pipe layer, and a reinforcing cage is installed within the pouring cavity. The pile tip has a pointed end and a connecting end at opposite ends, connected to the bottom of the steel pipe layer via a connecting plate. The pile cap is connected to the top of the steel pipe layer, and a grouting hole communicating with the pouring cavity is opened on the pile cap. The prestressing tendons are inserted within the reinforcing cage, extending axially along the pile body, and are connected between the pile cap and the connecting plate. The concrete, reinforcing cage, and prestressing tendons form an integrated load-bearing structure, improving the structural strength of the pile body. The buffer layer prevents the anti-corrosion layer from wearing away during pile driving, extending the service life of the pipe pile.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation technology, and in particular to a corrosion-resistant prestressed concrete pipe pile for soft soil foundations. Background Technology

[0002] Soft soil foundations generally refer to weak ground, such as silty soil, fill, and miscellaneous fill. Due to their high compressibility, low bearing capacity, and poor permeability, when constructing pipe piles in soft soil foundations, it is usually necessary to increase the penetration depth of the pipe piles to ensure sufficient bearing stability. This requires the pipe piles to penetrate into the stable geological body beneath the soft soil foundation, thus necessitating an increase in pipe pile length. However, this increased length leads to a decrease in structural strength. Furthermore, since soft soil foundations typically have high water content and are highly corrosive, pipe piles usually require a corrosion-resistant layer. However, during the pile driving process, the corrosion-resistant layer rubs against the geological body, and is prone to wear and failure, thereby affecting the service life of the pipe piles. Utility Model Content

[0003] The main purpose of this invention is to propose a corrosion-resistant prestressed concrete pipe pile for soft foundations, aiming to solve the technical problems of low structural strength and easy failure of corrosion-resistant layer due to wear in existing pipe piles for soft foundations.

[0004] To achieve the above objectives, the present invention proposes a corrosion-resistant prestressed concrete pipe pile for soft soil foundations, comprising a pile body, a pile tip, a pile cap, and prestressing tendons. The pile body includes a buffer layer, an anti-corrosion layer, and a steel pipe layer distributed radially from the outside to the inside. A pouring cavity for pouring concrete is formed within the steel pipe layer, and a reinforcing cage is installed within the pouring cavity. The two opposite ends of the pile tip are a pointed end and a connecting end, respectively, and the connecting end is connected to the bottom of the steel pipe layer via a connecting plate. The pile cap is connected to the top of the steel pipe layer, and a grouting hole communicating with the pouring cavity is opened on the pile cap. The prestressing tendons are inserted within the reinforcing cage, extending axially along the pile body, and are connected between the pile cap and the connecting plate.

[0005] In one embodiment, a first connecting rod is provided on the side of the connecting plate facing the casting cavity. The first connecting rod extends into the casting cavity and is connected to the bottom of the reinforcing cage. The side of the connecting plate away from the casting cavity is connected to the connecting end of the pile tip.

[0006] In one embodiment, the side of the connecting plate facing the casting cavity includes a tensioning area and a connecting area circumferentially disposed outside the tensioning area. The number of first connecting rods is multiple, and the multiple first connecting rods are distributed circumferentially at intervals in the connecting area. The bottom of the prestressing tendon is tensioned to the tensioning area.

[0007] In one embodiment, a second connecting rod is provided on the side of the pile cap facing the casting cavity. The second connecting rod extends into the casting cavity and is connected to the top of the reinforcing cage, and the second connecting rod is offset from the grouting hole.

[0008] In one embodiment, both the first connecting rod and the second connecting rod are threaded rods, the first connecting rod is welded to the bottom of the reinforcing cage, and the second connecting rod is welded to the top of the reinforcing cage.

[0009] In one embodiment, the edge of the connecting plate abuts against the top inner wall of the steel pipe layer, and the edge of the pile cap abuts against the bottom inner wall of the steel pipe layer.

[0010] In one embodiment, sealing rings are provided at the abutment points of the connecting plate and the steel pipe layer, as well as at the abutment points of the pile cap and the steel pipe layer.

[0011] In one embodiment, the pile cap is provided with a patch plate for sealing the grouting hole.

[0012] In one embodiment, the buffer layer is a glass fiber reinforced composite layer.

[0013] In one embodiment, the anti-corrosion layer is an epoxy resin coating applied to the outer wall of the steel pipe layer.

[0014] This invention proposes a corrosion-resistant prestressed concrete pipe pile for soft soil foundations. By installing a pile tip and a pile cap at both ends of the pile body, the pointed end of the pile tip effectively enhances the penetration capability of the pipe pile, facilitating its penetration into the stable geological body beneath the soft soil foundation during on-site pile driving. A casting cavity is formed within the steel pipe layer of the pile body. A connecting plate and a pile cap respectively seal the bottom and top of the casting cavity, allowing the steel pipe layer, connecting plate, and pile cap to collectively act as a molding mold for the concrete, ensuring uniform and dense concrete formation within the pile body. A pouring hole is provided on the pile cap for pouring concrete into the casting cavity. The concrete encapsulates the reinforcing cage and prestressing tendons internally, forming an integrated load-bearing structure that effectively improves the structural strength of the pile body. Before concrete pouring, tensile stress is applied to the prestressing tendons, allowing them to offset some of the external tensile stress on the pile body, effectively increasing the tensile strength of the pile body and thus enhancing its structural strength. By setting an anti-corrosion layer on the outside of the steel pipe layer, the anti-corrosion layer can resist corrosive substances in the soft soil and provide protection for the steel pipe layer, thereby improving the corrosion resistance of the corrosion-resistant prestressed concrete pipe pile. By setting a buffer layer on the outside of the anti-corrosion layer, the buffer layer provides protection for the anti-corrosion layer and avoids direct friction between the geological body and the anti-corrosion layer during the pile driving process, which would cause the anti-corrosion layer to wear and fail, thus greatly extending the service life of the corrosion-resistant prestressed concrete pipe pile. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of a portion of the steel pipe layer in an embodiment of the corrosion-resistant prestressed concrete pipe pile for soft soil foundation provided by this utility model;

[0017] Figure 2 An exploded structural diagram of an embodiment of the corrosion-resistant prestressed concrete pipe pile for soft soil foundation provided by this utility model;

[0018] Figure 3 A cross-sectional schematic diagram of an embodiment of the corrosion-resistant prestressed concrete pipe pile for soft soil foundation provided by this utility model.

[0019] Figure 4 This is a schematic diagram of an embodiment of the pile cap for corrosion-resistant prestressed concrete pipe piles used in soft soil foundations provided by this utility model.

[0020] Explanation of icon numbers:

[0021] 10. Pile body; 11. Buffer layer; 12. Anti-corrosion layer; 13. Steel pipe layer; 14. Casting cavity; 15. Reinforcing cage; 20. Pile tip; 21. Connecting plate; 211. First connecting rod; 30. Pile cover; 31. Grouting hole; 32. Second connecting rod; 40. Prestressed tendon.

[0022] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0024] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0025] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0026] When constructing pipe piles in soft soil, to ensure sufficient bearing stability, it is usually necessary to increase the penetration depth of the pipe piles, allowing them to penetrate into the stable geological body beneath the soft soil. This necessitates increasing the length of the pipe piles, which reduces structural strength. Furthermore, since soft soil typically has a high water content and is highly corrosive, pipe piles usually require a corrosion-resistant layer. However, during the pile driving process, the corrosion-resistant layer rubs against the geological body, easily leading to wear and failure, thus affecting the service life of the pipe piles.

[0027] This utility model proposes a corrosion-resistant prestressed concrete pipe pile for soft soil foundations, comprising a pile body 10, a pile tip 20, a pile cap 30, and prestressing tendons 40. The pile body 10 includes a buffer layer 11, an anti-corrosion layer 12, and a steel pipe layer 13 arranged radially from the outside to the inside. A pouring cavity 14 for pouring concrete is formed in the steel pipe layer 13, and a reinforcing cage 15 is installed in the pouring cavity 14. The pile tip 20 has a pointed end and a connecting end at opposite ends, and the connecting end is connected to the bottom of the steel pipe layer 13 through a connecting plate 21. The pile cap 30 is connected to the top of the steel pipe layer 13, and a grouting hole 31 communicating with the pouring cavity 14 is opened on the pile cap 30. The prestressing tendons 40 are inserted into the reinforcing cage 15, and the prestressing tendons 40 extend axially along the pile body 10 and are connected between the pile cap 30 and the connecting plate 21.

[0028] Please see Figure 1 and Figure 2 , Figure 1 A schematic diagram of a portion of the steel pipe layer 13 in an embodiment of the corrosion-resistant prestressed concrete pipe pile for soft foundation provided by this utility model; Figure 2This is an exploded structural diagram of an embodiment of the corrosion-resistant prestressed concrete pipe pile for soft soil foundation provided by this utility model; the pile tip 20 and the pile cap 30 are located at both ends of the pile body 10, respectively. The pile tip 20 is connected to the bottom of the steel pipe layer 13 of the pile body 10 through a connecting plate 21, and the pile cap 30 is directly connected to the top of the steel pipe layer 13. The prestressing tendon 40 is pulled between the pile cap 30 and the connecting plate 21. Before concrete pouring, the prestressing tendon 40 is pre-stressed, and then the connecting plate 21 and the pile cap 30 are fastened to the steel pipe layer 13. Please refer to... Figure 3 , Figure 3 This is a cross-sectional schematic diagram of an embodiment of the corrosion-resistant prestressed concrete pipe pile for soft soil foundations provided by this utility model. A casting cavity 14 is formed within the steel pipe layer 13, an anti-corrosion layer 12 is located outside the steel pipe layer 13, and a buffer layer 11 is located outside the anti-corrosion layer 12. A reinforcing cage 15 is installed inside the steel pipe layer 13. The reinforcing cage 15 is cylindrical and spaced apart from the steel pipe layer 13, and prestressing tendons 40 are threaded through it. The steel pipe layer 13 provides a mold for concrete casting. When concrete is poured into the casting cavity 14, the concrete encloses the reinforcing cage 15 and the prestressing tendons 40, tightly bonding the reinforcing cage 15, prestressing tendons 40, steel pipe layer 13, and concrete to form an integrally stressed prestressed concrete pipe pile structure. It can be noted that a space for pouring concrete is formed between the pile tip 20 and the connecting plate 21. The prestressed concrete pipe pile proposed in this utility model is a precast pipe pile, which is driven into the field after molding.

[0029] This invention proposes a corrosion-resistant prestressed concrete pipe pile for soft soil foundations. By providing a pile tip 20 and a pile cap 30 at both ends of the pile body 10, the pointed end of the pile tip 20 effectively enhances the penetration capability of the pipe pile, facilitating its penetration into the stable geological body beneath the soft soil foundation during on-site pile driving. A casting cavity 14 is formed within the steel pipe layer 13 of the pile body 10. A connecting plate 21 and the pile cap 30 respectively seal the bottom and top of the casting cavity 14, allowing the steel pipe layer 13, connecting plate 21, and pile cap 30 to collectively serve as a concrete forming mold, ensuring uniform and dense concrete formation within the pile body 10. A pouring hole is provided on the pile cap 30 to allow concrete to be poured into the casting cavity 14. The concrete encloses the reinforcing cage 15 and prestressing tendons 40 internally, forming an integrated load-bearing structure and effectively improving the structural strength of the pile body 10. Before concrete pouring, tensile stress is applied to the prestressing tendons 40, enabling them to offset part of the external tensile stress on the pile body 10, effectively improving the tensile strength of the pile body 10 and thus enhancing its structural strength. By setting an anti-corrosion layer 12 outside the steel pipe layer 13, the anti-corrosion layer 12 can resist corrosive substances in the soft soil, providing protection for the steel pipe layer 13 and thus improving the corrosion resistance of the corrosion-resistant prestressed concrete pipe pile. Furthermore, by setting a buffer layer 11 outside the anti-corrosion layer 12, the buffer layer 11 protects the anti-corrosion layer 12, preventing direct friction between the geological body and the anti-corrosion layer 12 during pile driving, thus avoiding wear and failure of the anti-corrosion layer 12 and significantly extending the service life of the corrosion-resistant prestressed concrete pipe pile.

[0030] In one embodiment, a first connecting rod 211 is provided on the side of the connecting plate 21 facing the pouring cavity 14. The first connecting rod 211 extends into the pouring cavity 14 and is connected to the bottom of the reinforcing cage 15. The side of the connecting plate 21 away from the pouring cavity 14 is connected to the connecting end of the pile tip 20.

[0031] Please see Figure 2 The first connecting rod 211 extends upward from the connecting plate 21. The upper end of the first connecting rod 211 is connected to the bottom of the reinforcing cage 15. Specifically, the upper end of the first connecting rod 211 is provided with a hook structure to hang on the bottom of the reinforcing cage 15 and is welded to the bottom of the reinforcing cage 15, thereby fastening the connecting plate 21 and the reinforcing cage 15. This allows the connecting plate 21 to provide an installation point for the reinforcing cage 15, ensuring that the position of the reinforcing cage 15 remains fixed during the concrete pouring process in the pouring cavity 14, and ensuring that the concrete and the reinforcing cage 15 are tightly connected to form a stable pile body 10 structure.

[0032] In one embodiment, the side of the connecting plate 21 facing the casting cavity 14 includes a tensioning area and a connecting area circumferentially disposed outside the tensioning area. There are multiple first connecting rods 211, which are distributed circumferentially in the connecting area. The bottom of the prestressing tendon 40 is tensioned to the tensioning area.

[0033] Furthermore, the reinforcing cage 15 is ring-shaped, with the connecting area surrounding the tensioning area to form a ring-shaped region. Multiple installation points for the first connecting rods 211 are evenly distributed along the circumferential direction, ensuring that the shapes of the first connecting rods 211 match those of the reinforcing cage 15. One end of each first connecting rod 211 is firmly welded to the connecting area, while the other end extends upwards, with a hook structure at its upper end to hook onto the transverse reinforcing bars at the bottom of the reinforcing cage 15. Multiple points are welded to the reinforcing cage 15 to form a stable connection. The prestressing tendons 40 are tensioned in the tensioning area, and the prestress of the prestressing tendons 40 is transferred to the connecting plate 21 through the tensioning area. The multiple first connecting rods 211 are evenly distributed along the circumferential direction, ensuring a uniform distribution of tensile force on the reinforcing cage 15, avoiding localized stress concentration, and improving the overall integrity and bearing capacity of the pile body 10.

[0034] In one embodiment, a second connecting rod 32 is provided on the side of the pile cap 30 facing the pouring cavity 14. The second connecting rod 32 extends into the pouring cavity 14 and is connected to the top of the reinforcing cage 15. The second connecting rod 32 is staggered with the grouting hole 31.

[0035] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a pile cap 30 for a corrosion-resistant prestressed concrete pipe pile for soft foundation provided by this utility model; the second connecting rod 32 tightly connects the pile cap 30 to the top of the reinforcing cage 15. During the concrete pouring process, the second connecting rod 32 connects the pile cap 30 and the reinforcing cage 15 into a whole, preventing the pile cap 30 from shifting or lifting during the concrete pouring and subsequent prestressing process, ensuring a tight fit between the pile cap 30 and the reinforcing cage 15, and improving the integrity and stability of the pile body 10.

[0036] In one embodiment, both the first connecting rod 211 and the second connecting rod 32 are threaded rods. The first connecting rod 211 is welded to the bottom of the reinforcing cage 15, and the second connecting rod 32 is welded to the top of the reinforcing cage 15.

[0037] Understandably, both the first connecting rod 211 and the second connecting rod 32 are made of high-strength threaded steel with uniformly distributed external threads on their surfaces to enhance adhesion to concrete. During connection, the threaded end of the first connecting rod 211 is aligned with the welding area at the bottom of the reinforcing cage 15, and the two are firmly joined together through precise welding to form a stable connection point. One end of the second connecting rod 32 is firmly welded to the pile cap 30, and the other end extends downwards to a predetermined position at the top of the reinforcing cage 15. The welding area at the top of the reinforcing cage 15 is also specially treated to precisely align with the threaded end of the second connecting rod 32, and a firm connection is achieved through welding. The first connecting rod 211 and the second connecting rod 32 fix the reinforcing cage 15 into the pouring cavity 14 from the bottom and top, respectively, preventing displacement or deformation of the reinforcing cage 15 during concrete pouring and ensuring that the concrete evenly envelops the reinforcing cage 15, forming a tight structure.

[0038] In one embodiment, the edge of the connecting plate 21 abuts against the top inner wall of the steel pipe layer 13, and the edge of the pile cap 30 abuts against the bottom inner wall of the steel pipe layer 13.

[0039] It should be noted that the edge of the connecting plate 21 abuts against the top inner wall of the steel pipe layer 13, and the edge of the pile cap 30 abuts against the bottom inner wall of the steel pipe layer 13. This seals both ends of the pouring cavity 14, ensuring its airtightness and preventing concrete leakage. Furthermore, the prestressing tendons 40 are connected between the connecting plate 21 and the pile cap 30. After the concrete in the pouring cavity 14 solidifies, the connecting plate 21 and the pile cap 30, under the tension of the prestressing tendons 40, abut against both ends of the concrete, providing pressure and fully utilizing its compressive strength. This prevents tensile failure, further improves the load-bearing capacity of the pile body 10, and enhances the structural strength and bearing capacity of the pipe pile.

[0040] In one embodiment, sealing rings are provided at the abutment of the connecting plate 21 and the steel pipe layer 13, as well as at the abutment of the pile cap 30 and the steel pipe layer 13.

[0041] Furthermore, a sealing ring is provided between the edge of the connecting plate 21 and the inner wall of the steel pipe layer 13, and a sealing ring is also provided between the edge of the pile cap 30 and the inner wall of the steel pipe layer 13. During concrete pouring, the sealing ring can effectively prevent the overflow of concrete slurry, thereby ensuring the integrity and density of the concrete in the pile body 10. Due to the elastic properties of the sealing ring, it can compensate for minor dimensional deviations between the connecting plate 21, the pile cap 30, and the steel pipe layer 13 to a certain extent, enhancing the reliability and stability of the connection.

[0042] In one embodiment, the pile cap 30 is provided with a patch plate for sealing the grouting hole 31.

[0043] Understandably, the shape and size of the patch plate match the shape and size of the grouting hole 31 to ensure complete coverage of the grouting hole 31. This seals the grouting hole 31 after concrete pouring, preventing moisture, corrosive substances, or other impurities from entering the pile body 10, thereby protecting the reinforcing cage 15 and prestressed tendons 40 of the pile body 10 from corrosion. The patch plate ensures the overall sealing of the pile body 10, improves its durability and reliability, prevents the concrete and reinforcing steel structure inside the pile body 10 from being affected by the external environment, and extends the service life of the pile body 10.

[0044] In one embodiment, the buffer layer 11 is a glass fiber reinforced composite layer.

[0045] It can be noted that the buffer layer 11 adopts a glass fiber reinforced composite layer, which is made of multiple layers of glass fiber cloth impregnated with resin and then cured under high temperature and pressure. This composite layer possesses high strength, corrosion resistance, and good insulation properties. The glass fiber reinforced composite layer is bonded to the outside of the anti-corrosion layer 12 using a special adhesive, forming a tightly fitted structure. During the pile driving process of the pile body 10, the glass fiber reinforced composite layer withstands the impact and friction forces from the outside of the pile body 10, effectively absorbing and dispersing impact energy, reducing the direct impact force on the anti-corrosion layer 12 and the steel pipe layer 13, thereby protecting the anti-corrosion layer 12 and the steel pipe layer 13 from damage.

[0046] In one embodiment, the anti-corrosion layer 12 is an epoxy resin coating applied to the outer wall of the steel pipe layer 13.

[0047] Explained, the anti-corrosion layer 12 uses an epoxy resin coating, a technology already available. This effectively blocks moisture, oxygen, salt, and other corrosive substances in the soft soil environment from contacting the steel pipe layer 13, thereby significantly slowing down the corrosion rate of the steel pipe layer 13 and improving its service life. The high adhesion of the epoxy resin coating allows it to firmly adhere to the surface of the steel pipe layer 13, preventing it from peeling off due to external mechanical forces or environmental factors, thus ensuring the long-term stability and reliability of the pile body 10 in harsh soft soil environments.

[0048] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A corrosion resistant prestressed concrete pipe pile for soft ground, characterized by, include: The pile body includes a buffer layer, an anti-corrosion layer and a steel pipe layer distributed radially from the outside to the inside. A pouring cavity for pouring concrete is formed in the steel pipe layer, and a reinforcing cage is installed in the pouring cavity. The pile tip has a pointed end and a connecting end at opposite ends, and the connecting end is connected to the bottom of the steel pipe layer by a connecting plate. A pile cap, which is connected to the top of the steel pipe layer, and the pile cap has a grouting hole that communicates with the casting cavity; The prestressing tendon is inserted into the steel cage, extends axially along the pile body, and is connected between the pile cap and the connecting plate.

2. The corrosion resistant prestressed concrete pipe pile for soft ground according to claim 1, wherein, A first connecting rod is provided on the side of the connecting plate facing the casting cavity. The first connecting rod extends into the casting cavity and is connected to the bottom of the reinforcing cage. The side of the connecting plate away from the casting cavity is connected to the connecting end of the pile tip.

3. The corrosion resistant prestressed concrete pipe pile for soft ground according to claim 2, wherein, The connecting plate includes a tensioning area and a connecting area circumferentially disposed outside the tensioning area on the side facing the casting cavity. There are multiple first connecting rods, which are distributed circumferentially in the connecting area. The bottom of the prestressing tendon is tensioned to the tensioning area.

4. The corrosion-resistant prestressed concrete pipe pile for soft soil foundation as described in claim 2, characterized in that, A second connecting rod is provided on the side of the pile cap facing the pouring cavity. The second connecting rod extends into the pouring cavity and is connected to the top of the reinforcing cage. The second connecting rod is staggered from the grouting hole.

5. The corrosion-resistant prestressed concrete pipe pile for soft soil foundation as described in claim 4, characterized in that, Both the first connecting rod and the second connecting rod are threaded rods. The first connecting rod is welded to the bottom of the reinforcing cage, and the second connecting rod is welded to the top of the reinforcing cage.

6. The corrosion-resistant prestressed concrete pipe pile for soft foundations as described in any one of claims 1 to 5, characterized in that, The edge of the connecting plate abuts against the top inner wall of the steel pipe layer, and the edge of the pile cap abuts against the bottom inner wall of the steel pipe layer.

7. The corrosion-resistant prestressed concrete pipe pile for soft soil foundation as described in claim 6, characterized in that, Sealing rings are provided at the joints between the connecting plate and the steel pipe layer, as well as at the joints between the pile cap and the steel pipe layer.

8. The corrosion-resistant prestressed concrete pipe pile for soft foundation as described in any one of claims 1 to 5, characterized in that, The pile cap is provided with a patch plate for sealing the grouting hole.

9. The corrosion-resistant prestressed concrete pipe pile for soft foundations as described in any one of claims 1 to 5, characterized in that, The buffer layer is a glass fiber reinforced composite layer.

10. The corrosion-resistant prestressed concrete pipe pile for soft soil foundation as described in any one of claims 1 to 5, characterized in that, The anti-corrosion layer is an epoxy resin coating applied to the outer wall of the steel pipe layer.

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