Corrosion-resistant prestressed concrete pipe pile connector and construction method thereof
By using thermoplastic high-performance engineering plastics and quick steel joints for fusion welding, the problem of easy corrosion of traditional metal joints in corrosive environments is solved, realizing a prestressed concrete pipe pile joint with corrosion resistance and high strength, reducing maintenance costs and improving construction efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-05
- Publication Date
- 2026-04-03
AI Technical Summary
The metal joints of traditional prestressed concrete pipe piles are prone to corrosion failure in corrosive environments, resulting in high maintenance costs. Furthermore, stainless steel joints may still corrode in certain environments, leading to a decline in pile foundation performance and poor economic efficiency.
The pile head and quick steel joint, made of thermoplastic high-performance engineering plastic, are connected to the prestressed concrete pipe pile by fusion welding. The thermoplastic high-strength engineering plastic and quick steel joint isolate the pile head from the environment to achieve a tight connection.
It improves the corrosion resistance and mechanical properties of the joint, reduces the total life cycle cost, and ensures the reliability and construction efficiency of the pile connection.
Smart Images
Figure CN121781584A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to pile foundation engineering construction technology, and also to composite material technology, specifically to a corrosion-resistant prestressed concrete pipe pile joint and its construction method. Background Technology
[0002] In marine engineering, nearshore construction, and corrosive geological environments, prestressed concrete pipe piles serve as the foundation load-bearing structure, and the durability and reliability of their joints directly determine the overall project lifespan. Traditional prestressed concrete pipe piles generally use metal (such as carbon steel or stainless steel) joints, connecting pipe pile segments through welding or threaded connections to achieve the transfer of pile foundation forces. However, in harsh environments such as chloride ion corrosion, humid salt spray, and microbial corrosion, metal joints face the following serious problems:
[0003] (1) Corrosion failure: Metal materials are prone to electrochemical corrosion, which leads to loss of joint cross-sectional area and relaxation of prestressing tendons, significantly reducing the vertical bearing capacity and lateral shear resistance of pipe piles.
[0004] (2) High maintenance cost: In order to delay corrosion, existing technologies mostly use galvanizing, epoxy coating or cathodic protection. However, the coating is prone to local failure due to wear during transportation and installation. The cathodic protection system requires continuous energy consumption and monitoring, resulting in poor long-term economic efficiency.
[0005] (3) Environmental adaptability limitations: Although stainless steel joints improve corrosion resistance to some extent, pitting corrosion may still occur in high-concentration acidic soil or high-temperature seawater environments.
[0006] Therefore, there is an urgent need to develop a new type of prestressed concrete pipe pile joint that combines high corrosion resistance, excellent mechanical properties, and controllable cost throughout its entire life cycle, in order to break through the technical bottleneck of traditional metal materials and meet the long-term service requirements of prestressed concrete pipe piles in extreme corrosive environments. Summary of the Invention
[0007] To address the technical problems existing in the prior art, the purpose of this invention is to provide a corrosion-resistant prestressed concrete pipe pile joint and its construction method, which has high corrosion resistance, excellent mechanical properties, and controllable life-cycle costs.
[0008] To achieve the above objectives, the present invention adopts the following technical solution:
[0009] A corrosion-resistant prestressed concrete pipe pile joint is installed at the end of a prestressed concrete pipe pile, connecting two prestressed concrete pipe piles by butt jointing on the outer sides of the two joints. The joint includes a main body and a quick-connect steel connector. The main body includes a pile head and a pile casing, which are integrally made of thermoplastic high-performance engineering plastic. The pile casing is located at the edge of the pile head and is used to protect the end of the prestressed concrete pipe pile. A first anchor hole is opened through the pile head, which is used to anchor the end of the prestressed tendon of the prestressed concrete pipe pile. A countersunk hole is opened on the butt joint side of the pile head, which is used to install the quick-connect steel connector. A second anchor hole is opened through the bottom of the countersunk hole, which is used to anchor the end lapped reinforcement of the prestressed concrete pipe pile. The quick-connect steel connector includes a mutually cooperating protrusion and a gripping part, which are respectively installed in the countersunk holes of adjacent joints. When two prestressed concrete pipe piles are butt jointed, the two joints are aligned by the cooperation of the protrusion and the gripping part, and the thermoplastic high-performance engineering plastic on the outer side of the pile head is melt-bonded.
[0010] As a preferred embodiment, in the pile head, the first anchor hole includes a cylindrical hole section opened on the inner surface of the pile head and a trumpet hole section opened on the outer surface of the pile head. The end of the prestressing tendon is a trumpet-shaped pier. After the pier is inserted into the trumpet hole section, the end of the pier is lower than the outer surface of the pile head.
[0011] As a preferred embodiment, both the countersunk hole and the second anchor hole are cylindrical holes; the quick steel joint includes a connecting sleeve, which is embedded in the countersunk hole, and the end of the lap bar of the prestressed concrete pipe pile is a trumpet-shaped pier, which passes through the bottom of the connecting sleeve and the second anchor hole in sequence, and its pier is engaged with the bottom of the connecting sleeve; the connecting sleeve is provided with an internal thread that connects to the protrusion or the gripping part.
[0012] As a preferred embodiment, the protrusion includes an externally threaded connecting section and a positioning post. The externally threaded connecting section engages with the internal thread of the connecting sleeve. The lateral surface of the positioning post is provided with multiple raised annular positioning teeth. The gripping part is an elastic sleeve including an externally threaded section and an internally positioning tooth, and three vertical grooves are evenly opened along its circumference. The external thread of the elastic sleeve engages with the internal thread of the connecting sleeve, and a certain gap is provided between the elastic sleeve and the connecting sleeve. The positioning teeth on the inner side of the elastic sleeve of the gripping part engage with the annular positioning teeth on the lateral surface of the positioning post of the protrusion. When the positioning post of the protrusion is inserted into the elastic sleeve of the gripping part, the elastic sleeve of the gripping part expands outward, realizing a tight connection between the gripping part and its connecting sleeve.
[0013] As a preferred embodiment, a heating film is pre-embedded on the inner surface of the pile head near the outer surface; the heating film is a high-temperature resistant metal heating film or a ceramic-based heating film.
[0014] As a preferred embodiment, the pile head has a circular cross-section and the pile casing is cylindrical; there are multiple first anchor holes and sinking holes, all evenly arranged along the circumference, and the quick steel joints corresponding to the sinking holes are also evenly arranged along the circumference.
[0015] As a preferred option, thermoplastic high-performance engineering plastics can withstand pressure of 1.2 MPa and temperature of 100°C for ≥10 hours; the tensile strength of thermoplastic high-performance engineering plastics after fusion welding is ≥40 MPa; the shear strength of thermoplastic high-performance engineering plastics is ≥30 MPa; and for prestressed concrete pipe piles constructed using the hammer-driven method, the impact strength of thermoplastic high-performance engineering plastics is ≥40 KJ / m. 2 Reinforcement is achieved by adding glass fibers or carbon fibers to the material matrix.
[0016] As a preferred option, the inner wall of the pile casing is serrated or threaded.
[0017] A construction method for a corrosion-resistant prestressed concrete pipe pile joint includes the following steps:
[0018] a. After the prestressed concrete pipe pile is driven to the preset depth, the upper prestressed concrete pipe pile is hoisted to the top, and acetone is used to clean the outer surface of the upper and lower pile heads to remove the grease or oxide layer on the surface.
[0019] b. The two pile heads are aligned through the cooperation of the protrusion and the grip, and the high-performance engineering plastic on the surface of each pile head is melted and bonded together;
[0020] c. Natural cooling allows for complete connection of the two connectors.
[0021] As a preferred option, step b employs either a heating diaphragm fusion welding process or a temperature-controlled hot plate fusion welding process. The heating diaphragm fusion welding process involves first inserting the protrusion of the upper pile head into the gripping part of the lower pile head to connect the upper and lower pile heads; then, using a pile driver, a stable pressure of 0.5-1.0 MPa is continuously applied to the pile body; the heating diaphragm is connected to heat and melt the surfaces of the upper and lower pile heads. The temperature-controlled hot plate fusion welding process involves first aligning the protrusion of the upper pile head with the gripping part of the lower pile head, leaving sufficient operating space for the temperature-controlled hot plate; then, using two temperature-controlled hot plates to melt the surfaces of the upper and lower pile heads respectively; removing the temperature-controlled hot plates, and quickly and tightly connecting the quick-connect steel joint to connect the upper and lower pile heads; finally, using a pile driver, a stable pressure of 0.5-1.0 MPa is continuously applied to the pile body.
[0022] The principle of this invention is:
[0023] The quick-connect steel joint enables rapid alignment between pile heads. It connects the end lap joints of the upper and lower pipe piles, and achieves a tight connection by heating and melting the outer surface of the pile head. Because the joint body is made of a single piece of thermoplastic high-performance engineering plastic, and the tight connection between the two pile heads is achieved through welding using this method, the internal prestressing tendons, end lap joints, and quick-connect steel joint are completely isolated from the external environment, resulting in good corrosion resistance.
[0024] The present invention has the following advantages:
[0025] 1. This invention uses thermoplastic high-performance engineering plastics to replace traditional steel in the manufacture of prestressed concrete pipe pile joints. This material has the advantages of high strength and good corrosion resistance.
[0026] 2. This invention solves the problem of pile connection failure caused by corrosion of traditional steel pile joints in corrosive environments (such as oceans and underground chemical plants), and also prevents corrosive substances in the environment from penetrating into the pile body through the pile joint and corroding the pile reinforcement.
[0027] 3. This invention achieves the connection of the pile body through pile head fusion welding and steel quick joints, resulting in good connection reliability and high construction efficiency.
[0028] 4. The inner wall of the pile casing is serrated or threaded to strengthen the connection between the entire joint and the pile concrete, and to increase the seepage path to prevent water in the environment from seeping into the pile head and corroding the steel reinforcement of the pipe pile. Attached Figure Description
[0029] Figure 1 This is a top view of a corrosion-resistant prestressed concrete pipe pile joint.
[0030] Figure 2 This is an AA cross-sectional disassembly diagram of a corrosion-resistant prestressed concrete pipe pile joint (heated diaphragm fusion welding type).
[0031] Figure 3 This is a cross-sectional connection diagram of a corrosion-resistant prestressed concrete pipe pile joint (heated diaphragm fusion welding type).
[0032] Figure 4 This is a cross-sectional connection diagram of a corrosion-resistant prestressed concrete pipe pile joint (temperature-controlled hot plate fusion welding type).
[0033] In the diagram, 1-upper pile head, 2-lower pile head, 3-upper pile casing, 4-lower pile casing, 5-upper connecting sleeve, 6-lower connecting sleeve, 7-heating diaphragm, 8-first anchor hole, 9-prestressed tendon, 10-end lap joint, 11-pile body concrete, 12-quick steel joint. Detailed Implementation
[0034] The present invention will now be described in further detail with reference to specific embodiments.
[0035] Example 1
[0036] A corrosion-resistant prestressed concrete pipe pile joint is installed at the end of a prestressed concrete pipe pile, connecting two prestressed concrete pipe piles by butt jointing on the outer sides of the two joints. The joint includes a main body and a quick-connect steel connector. The main body includes a pile head and a pile casing, which are integrally made of thermoplastic high-performance engineering plastic. The pile casing is located at the edge of the pile head and is used to protect the end of the prestressed concrete pipe pile. A first anchor hole is opened through the pile head, which is used to anchor the end of the prestressed tendon of the prestressed concrete pipe pile. A countersunk hole is opened on the butt joint side of the pile head, which is used to install the quick-connect steel connector. A second anchor hole is opened through the bottom of the countersunk hole, which is used to anchor the end lapped reinforcement of the prestressed concrete pipe pile. The quick-connect steel connector includes a mutually cooperating protrusion and a gripping part, which are respectively installed in the countersunk holes of adjacent joints. When two prestressed concrete pipe piles are butt jointed, the two joints are aligned by the cooperation of the protrusion and the gripping part, and the thermoplastic high-performance engineering plastic on the outer side of the pile head is melt-bonded.
[0037] In this embodiment, the prestressed concrete pipe pile body is made of concrete casting, and prestressed tendons and end lap bars are provided. The arrangement of the prestressed tendons and end lap bars is the prior art.
[0038] In the pile head, the first anchor hole includes a cylindrical hole section opened on the inner surface of the pile head and a trumpet hole section opened on the outer surface of the pile head. The end of the prestressing tendon is a trumpet-shaped pier. After the pier is inserted into the trumpet hole section, the end of the pier is lower than the outer surface of the pile head.
[0039] In this embodiment, a first anchor hole is provided, and the thickness of the pile head needs to be sufficient to resist the punching force of the prestressing tendon to ensure the anchorage of the prestressing tendon. Alternatively, a spring washer can be provided at the prestressing tendon pier to reduce the punching force of the prestressing tendon on the pile head.
[0040] Both the countersunk hole and the second anchor hole are cylindrical holes; the quick steel joint includes a connecting sleeve, which is embedded in the countersunk hole; the end of the lap bar of the prestressed concrete pipe pile is a trumpet-shaped pier, and the end lap bar passes through the bottom of the connecting sleeve and the second anchor hole in sequence, and its pier is inserted into the bottom of the connecting sleeve; the connecting sleeve is provided with an internal thread that connects to the protrusion or the gripping part.
[0041] The protrusion includes an external threaded connecting section and a positioning post. The external threaded connecting section mates with the internal thread of the connecting sleeve. The positioning post has multiple raised annular positioning teeth on its lateral surface. The gripping part is an elastic sleeve including an external thread and an internal positioning tooth, and three vertical grooves are evenly opened along its circumference. The external thread of the elastic sleeve mates with the internal thread of the connecting sleeve, and there is a certain gap between the elastic sleeve and the connecting sleeve. The positioning teeth on the inner side of the elastic sleeve of the gripping part mate with the annular positioning teeth on the lateral surface of the positioning post of the protrusion. When the positioning post of the protrusion is inserted into the elastic sleeve of the gripping part, the elastic sleeve of the gripping part expands outward, realizing a tight connection between the gripping part and its connecting sleeve.
[0042] A heating film is pre-embedded on the inner surface of the pile head, near the outer surface; the heating film is a high-temperature resistant metal heating film or a ceramic-based heating film.
[0043] In this embodiment, a heating film is pre-embedded at a certain thickness on the surface of both the upper and lower pile heads. The selection of this thickness and the coverage area are conventional choices made by those skilled in the art. The heating film must be a high-temperature resistant (≥200°C) metal heating film or a ceramic-based heating film. To ensure the interfacial bonding between the thermoplastic high-performance engineering plastic of the pile head and the heating film, the surface where the plastic and the heating film meet needs to be modified or an intermediate adhesive layer needs to be added. In addition, a closed-loop temperature control system needs to be designed for the heating film to precisely control the heating temperature and time according to the welding process requirements of the thermoplastic high-performance engineering plastic.
[0044] The pile head has a circular cross-section, and the pile casing is cylindrical. There are multiple first anchor holes and sinking holes, all evenly arranged along the circumference. The quick steel joints corresponding to the sinking holes are also evenly arranged along the circumference.
[0045] Thermoplastic high-performance engineering plastics can withstand pressure of 1.2 MPa and temperature of 100°C for ≥10 hours to ensure their performance remains stable during high-temperature and high-pressure curing of prestressed concrete pipe piles. Examples include polyetheretherketone (PEEK), polyphenylene sulfide (PPS), and liquid crystal polymers (LCP).
[0046] Thermoplastic high-performance engineering plastics are required to have good chemical corrosion resistance.
[0047] After fusion welding, the tensile strength of thermoplastic high-performance engineering plastics is ≥40 MPa. To improve the welding strength, glass fiber or carbon fiber can be added to the matrix for reinforcement.
[0048] Thermoplastic high-performance engineering plastics have a shear strength ≥30 MPa and can also be reinforced with glass fiber or carbon fiber.
[0049] For prestressed concrete pipe piles constructed using the hammer-driven method, the impact strength of the thermoplastic high-performance engineering plastic must be ≥40KJ / m. 2To ensure the stability of the joint performance during hammering construction, glass fiber or carbon fiber can also be added for reinforcement.
[0050] The inner wall of the pile casing is serrated or threaded.
[0051] The thermoplastic high-performance engineering plastic used in the prestressed concrete pipe pile joint of the present invention has excellent corrosion resistance and effectively isolates the pile reinforcement from the corrosive environment around the pipe pile, solving the problem of the poor corrosion resistance of traditional prestressed concrete pipe pile steel joints. In addition, the joint ensures the required strength of the prestressed concrete pipe pile and has the advantages of simple assembly and high construction efficiency.
[0052] Example 2
[0053] A construction method for a corrosion-resistant prestressed concrete pipe pile joint, using the corrosion-resistant prestressed concrete pipe pile joint of Example 1, includes the following steps:
[0054] a. After the prestressed concrete pipe pile is driven to the preset depth, the upper prestressed concrete pipe pile is hoisted to the top, and acetone is used to clean the outer surface of the upper and lower pile heads to remove the grease or oxide layer on the surface.
[0055] b. The two pile heads are aligned through the cooperation of the protrusion and the grip, and the high-performance engineering plastic on the surface of each pile head is melted and bonded together;
[0056] c. Natural cooling allows for complete connection of the two connectors.
[0057] In step b, the heating diaphragm fusion welding process is as follows: First, the protrusion of the upper pile head is inserted into the gripping part of the lower pile head to connect the upper and lower pile heads; then, a stable pressure of 0.5-1.0 MPa is continuously applied to the pile body using a pile driver; the heating diaphragm is then connected to heat and melt the surfaces of the upper and lower pile heads, thereby achieving the connection between the upper and lower pile heads. The specific heating temperature and heating time of the heating diaphragm need to be determined according to the welding requirements of thermoplastic high-performance engineering plastics.
[0058] The parts not mentioned in this embodiment are the same as in Embodiment 1.
[0059] Example 3
[0060] A construction method for a corrosion-resistant prestressed concrete pipe pile joint is disclosed. This joint differs from the one described in Example 1 in that it does not have a pre-embedded heating diaphragm inside the pile head. The construction method includes the following steps:
[0061] a. After the prestressed concrete pipe pile is driven to the preset depth, the upper prestressed concrete pipe pile is hoisted to the top, and acetone is used to clean the outer surface of the upper and lower pile heads to remove the grease or oxide layer on the surface.
[0062] b. The two pile heads are aligned through the cooperation of the protrusion and the grip, and the high-performance engineering plastic on the surface of each pile head is melted and bonded together;
[0063] c. Natural cooling allows for complete connection of the two connectors.
[0064] In step b, the construction process for the temperature-controlled hot plate fusion welding is as follows: First, align the protrusion of the upper pile head with the gripping part of the lower pile head, leaving sufficient operating space for the temperature-controlled hot plate; second, use two temperature-controlled hot plates to melt the surfaces of the upper and lower pile heads respectively; remove the temperature-controlled hot plates and quickly and tightly connect the quick-connect steel joint to achieve the connection of the upper and lower pile heads; finally, use the pile driver to continuously apply a stable pressure to the pile body, with a magnitude of 0.5-1.0 MPa. The specific heating temperature and heating time of the temperature-controlled hot plate need to be determined according to the welding requirements of thermoplastic high-performance engineering plastics.
[0065] In this embodiment, the shape of the temperature-controlled heating plate is consistent with the shape of the pile head, such as... Figure 1 As shown, corresponding holes are reserved to avoid the quick-connect steel joint, and the outer ring is slightly larger than the pile head. The plastic is heated and melted by direct contact between a high-temperature controlled heating plate and the plastic surface.
[0066] The parts not mentioned in this embodiment are the same as in Embodiment 1.
[0067] In addition to the methods mentioned in the above embodiments, other existing socket-type structures can be used for quick-connect steel joints. These variations are all within the scope of protection of this invention.
[0068] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.
Claims
1. A corrosion-resistant prestressed concrete pipe pile joint, disposed at the end of a prestressed concrete pipe pile, connecting two prestressed concrete pipe piles by butt jointing the outer sides of two joints, characterized in that: The joint comprises a main body and a quick-connect steel connector. The main body includes a pile head and a pile casing, which are integrally manufactured using thermoplastic high-performance engineering plastic. The pile casing is located at the edge of the pile head and is used to protect the end of the prestressed concrete pipe pile. A first anchor hole is opened through the pile head, which is used to anchor the end of the prestressed tendon of the prestressed concrete pipe pile. A countersunk hole is opened on the butt joint side of the pile head, which is used to install the quick-connect steel connector. A second anchor hole is opened through the bottom of the countersunk hole, which is used to anchor the end lapped reinforcement of the prestressed concrete pipe pile. The quick-connect steel connector includes a mutually cooperating protrusion and a gripping part, which are respectively installed in the countersunk holes of adjacent connectors. When two prestressed concrete pipe piles are butt jointed, the two connectors are aligned by the cooperation of the protrusion and the gripping part, and the thermoplastic high-performance engineering plastic on the outside of the pile head is melt-bonded.
2. A corrosion-resistant prestressed concrete pipe pile joint according to claim 1, characterized in that: In the pile head, the first anchor hole includes a cylindrical hole section opened on the inner surface of the pile head and a trumpet hole section opened on the outer surface of the pile head. The end of the prestressing tendon is a trumpet-shaped pier. After the pier is inserted into the trumpet hole section, the end of the pier is lower than the outer surface of the pile head.
3. A corrosion-resistant prestressed concrete pipe pile joint according to claim 1, characterized in that: Both the countersunk hole and the second anchor hole are cylindrical holes; The quick steel joint includes a connecting sleeve, which is embedded in the countersunk hole. The end of the lap bar of the prestressed concrete pipe pile is a trumpet-shaped pier. The end lap bar passes through the bottom of the connecting sleeve and the second anchor hole in sequence, and its pier is engaged with the bottom of the connecting sleeve. The connecting sleeve is provided with an internal thread that connects with the protrusion or the gripping part.
4. A corrosion-resistant prestressed concrete pipe pile joint according to claim 3, characterized in that: The protrusion includes an external threaded connecting section and a positioning post. The external threaded connecting section mates with the internal thread of the connecting sleeve. The positioning post has multiple raised annular positioning teeth on its lateral surface. The gripping part is an elastic sleeve including an external thread and an internal positioning tooth, and three vertical grooves are evenly opened along its circumference. The external thread of the elastic sleeve mates with the internal thread of the connecting sleeve, and there is a certain gap between the elastic sleeve and the connecting sleeve. The positioning teeth on the inner side of the elastic sleeve of the gripping part mate with the annular positioning teeth on the lateral surface of the positioning post of the protrusion. When the positioning post of the protrusion is inserted into the elastic sleeve of the gripping part, the elastic sleeve of the gripping part expands outward, realizing a tight connection between the gripping part and its connecting sleeve.
5. A corrosion-resistant prestressed concrete pipe pile joint according to claim 1, characterized in that: A heating film is pre-embedded on the inner surface of the pile head, near the outer surface; the heating film is a high-temperature resistant metal heating film or a ceramic-based heating film.
6. A corrosion-resistant prestressed concrete pipe pile joint according to claim 1, characterized in that: The pile head has a circular cross-section, and the pile casing is cylindrical. There are multiple first anchor holes and sinking holes, all evenly arranged along the circumference. The quick steel joints corresponding to the sinking holes are also evenly arranged along the circumference.
7. A corrosion-resistant prestressed concrete pipe pile joint according to claim 1, characterized in that: Thermoplastic high-performance engineering plastics can withstand pressure of 1.2 MPa and temperature of 100°C for ≥10 hours; the tensile strength of thermoplastic high-performance engineering plastics after fusion welding is ≥40 MPa; the shear strength of thermoplastic high-performance engineering plastics is ≥30 MPa; for prestressed concrete pipe piles constructed by hammer driving, the impact strength of thermoplastic high-performance engineering plastics is ≥40 KJ / m. 2 Reinforcement is achieved by adding glass fibers or carbon fibers to the material matrix.
8. A corrosion-resistant prestressed concrete pipe pile joint according to claim 1, characterized in that: The inner wall of the pile casing is serrated or threaded.
9. A construction method for a corrosion-resistant prestressed concrete pipe pile joint according to any one of claims 1 to 8, characterized in that, Includes the following steps: a. After the prestressed concrete pipe pile is driven to the preset depth, the upper prestressed concrete pipe pile is hoisted to the top, and acetone is used to clean the outer surface of the upper and lower pile heads to remove the grease or oxide layer on the surface. b. The two pile heads are aligned through the cooperation of the protrusion and the grip, and the high-performance engineering plastic on the surface of each pile head is melted and bonded together; c. Natural cooling allows for complete connection of the two connectors.
10. A construction method for a corrosion-resistant prestressed concrete pipe pile joint according to claim 9, characterized in that: In step b, a heating diaphragm fusion welding process or a temperature-controlled hot plate fusion welding process is used. The construction process of heating diaphragm fusion welding is as follows: First, insert the protrusion of the upper pile head into the holding part of the lower pile head to connect the upper and lower pile heads; then, use the pile driver to continuously apply a stable pressure to the pile body, with a magnitude of 0.5-1.0MPa; connect the heating diaphragm to heat and melt the surfaces of the upper and lower pile heads; The construction process of temperature-controlled hot plate fusion welding is as follows: First, align the protrusion of the upper pile head with the gripping part of the lower pile head, and leave enough operating space for the temperature-controlled hot plate; then, use two temperature-controlled hot plates to melt the surfaces of the upper and lower pile heads respectively; remove the temperature-controlled hot plates and quickly connect the quick steel joint tightly to realize the connection of the upper and lower pile heads; finally, use the pile driver to continuously apply a stable pressure to the pile body, with a magnitude of 0.5-1.0MPa.