Sliding type steel pipe pile internal expander for offshore wind power

Abstract

The invention relates to the technical field of offshore wind power, and discloses a sliding type steel pipe pile internal expander for offshore wind power. According to the sliding type steel pipe pile internal expander for offshore wind power, the variable-diameter strip and the protective baffle are connected in a sliding mode through the sliding groove assembly, the connecting assembly is used for fixing the variable-diameter strip and the protective baffle, when the variable-diameter strip is replaced, an operator only needs to remove fixation of the connecting assembly, and the variable-diameter strip and the protective baffle can be replaced. According to the internal expander of the structure, the variable-diameter strip can be operated to slide until the variable-diameter strip is separated from the protection baffle, then sliding installation of a new variable-diameter strip is completed, and when the new variable-diameter strip slides to a designated position, the connecting assembly is used for rapid fixing. Compared with the scheme that a large number of bolts are needed for installation when the variable-diameter strip is replaced once, the large number of bolts are prevented from being disassembled when the variable-diameter strip is replaced; the time for replacing the reducing strip at a time is shortened, the operation steps are simplified, and the labor intensity of on-site constructors is reduced.

Description

Technical Field

[0001] This invention relates to the field of offshore wind power technology, and more specifically to a sliding steel pipe pile internal expander for offshore wind power. Background Technology

[0002] As an important component of clean energy, offshore wind power has shown a trend of expanding into deep-sea areas in recent years. Jacket foundations, with their significant advantages such as structural stability, wide applicability to various water depths, and relatively mature technology, have become one of the important foundation types for supporting offshore wind turbines.

[0003] In the installation of offshore wind turbine jacket foundations, the internal expansion joint, as a core piece of equipment for lifting and inserting steel pipe piles, directly impacts construction efficiency and safety through its structural design. In existing technologies, the internal expansion joint typically includes key components such as a toothed plate, protective baffles, and a reducing strip. The toothed plate is hydraulically driven to lift and tighten against the inner wall of the steel pipe pile, thus fixing the pile. Protective baffles are located on both sides of the toothed plate to protect it from impacts during the installation process. The reducing strip, through its height adjustment function, allows the outer diameter of the internal expansion joint to be as close as possible to the inner diameter of the steel pipe pile, minimizing the free extension distance of the toothed plate and optimizing the tightening effect. During installation, the protective baffle and the reducing strip are fixed together with multiple sets of bolts to ensure structural stability.

[0004] However, in actual construction, due to equipment wear or errors in the estimated diameter of the internal expander, the reducing strip needs to be replaced frequently. Since the reducing strip and the protective baffle are connected by a large number of bolts, each replacement requires a significant amount of time, seriously affecting the construction progress. Summary of the Invention

[0005] In view of this, the present invention provides a sliding steel pipe pile internal expander for offshore wind power, so as to solve the problem that the replacement of the diameter bar of the existing internal expander requires a lot of operation time.

[0006] The present invention provides a sliding steel pipe pile internal expander for offshore wind power, comprising an internal expander body, a protective baffle, and a reducing bar. The internal expander body is provided with an installation outer wall; the protective baffle is fixedly installed on the installation outer wall; the reducing bar is slidably connected to the protective baffle through a sliding groove assembly, the sliding direction being a first direction, and along the first direction, one side of the reducing bar is fixed to the protective baffle through a connecting assembly.

[0007] Beneficial effects: By using a sliding groove assembly to slidably connect the reducing strip to the protective baffle, and using a connecting assembly to fix the reducing strip to the protective baffle, when replacing the reducing strip, the operator only needs to release the fixing of the connecting assembly to operate the reducing strip to slide until it is detached from the protective baffle, and then complete the sliding installation of the new reducing strip. When it slides to the designated position, the connecting assembly is used to quickly fix it. Compared with the solution that requires a large number of bolts to install when replacing the reducing strip, the sliding steel pipe pile internal expander for offshore wind power of this structure avoids disassembling a large number of bolts when replacing the reducing strip, shortens the time for replacing the reducing strip, simplifies the operation steps, and reduces the labor intensity of on-site construction personnel.

[0008] In one alternative embodiment, the sliding steel pipe pile internal expander for offshore wind power further includes a guide baffle, which is installed on the side of the protective baffle away from the connecting assembly via an elastic reset structure along a first direction.

[0009] Beneficial effects: By installing the guide baffle along the first direction on the side of the protective baffle away from the connecting components, the guide baffle acts as a buffer contact, preferentially contacting the inner wall of the steel pipe pile. Due to the frequent swaying of the hull caused by wind and waves during offshore construction, the head of the internal expander (protective baffle area) may rigidly collide with the inner wall of the steel pipe pile. The elastic reset structure converts the impact force received by the guide baffle into elastic potential energy for absorption, preventing the impact force from being directly transmitted to the protective baffle and its connected reducing strip. This reduces the risk of deformation, cracking, or bolt loosening of the protective baffle due to collisions, extends the maintenance cycle, and reduces labor and spare parts replacement costs. Simultaneously, the guide baffle facilitates self-alignment during the internal expander's entry into the steel pipe pile, reducing the difficulty of its entry.

[0010] In one optional embodiment, the inner expander body is provided with a first slide groove; the guide baffle is slidably installed in the first slide groove.

[0011] Beneficial effects: By providing a first groove in the body of the internal expander, the guide baffle can slide into the predetermined position along the groove during installation, eliminating the need for additional positioning tools and reducing the difficulty of manual operation. Simultaneously, it allows for temporary positioning and fine-tuning during installation, reducing the risk of installation errors such as component misalignment or displacement.

[0012] In one optional embodiment, the elastic reset structure includes an elastic reset member installed between the guide baffle and the protective baffle, wherein the elastic deformation direction of the elastic reset member is parallel to a first direction.

[0013] Beneficial effects: By aligning the elastic deformation direction of the elastic reset component with the first direction, when the hull is rocked by waves or the guide baffle is impacted during installation, the guide baffle moves along the sliding direction, compressing or stretching the elastic reset component. Through elastic deformation, it absorbs the impact energy, converting kinetic energy into elastic potential energy, reducing the risk of the impact force being directly transmitted to the protective baffle, and avoiding damage to the protective baffle caused by rigid collisions.

[0014] In one alternative embodiment, a plurality of elastic reset members are provided, and the plurality of elastic reset members are arranged at intervals along a second direction.

[0015] Beneficial effects: By arranging multiple independent elastic reset elements at intervals along the second direction, the impact force on the guide baffle can be distributed to multiple elastic reset elements, avoiding single-point overload and local stress concentration, forming a redundant design. If one elastic reset element fails due to fatigue after long-term use, other elastic reset elements can still maintain the buffering function, avoiding systemic failure and improving the reliability of the internal expander.

[0016] In one alternative embodiment, along the first direction, the protective baffle has a limiting baffle on the side away from the connecting component; when the variable diameter strip is slidably installed, the side away from the connecting component abuts against the limiting baffle.

[0017] Beneficial effects: The limiting baffle is set on the side of the protective baffle away from the connecting component. When the variable diameter bar slides to the farthest position in the first direction, its end will physically contact the limiting baffle, thereby forcibly terminating the sliding stroke and preventing the variable diameter bar from leaving the guide groove or colliding with the connecting component due to excessive sliding, thus preventing damage due to uncontrolled sliding.

[0018] In one optional embodiment, the slide assembly includes a slider disposed in one of the variable diameter bar and the protective baffle, and a second slide in the other of the variable diameter bar and the protective baffle, wherein the side of the second slide is open, and the slider slides into the interior of the second slide at the side opening of the second slide.

[0019] Beneficial effects: By providing an opening on the side of the second slide groove, the slider can slide directly into the second slide groove from the side opening during installation, reducing the precision requirements and operational difficulty in assembling the variable diameter strip onto the guide plate.

[0020] In one optional embodiment, the slider includes a neck and a limiting head. The neck is connected to the variable diameter bar, and the limiting head is installed on the side of the neck away from the variable diameter bar. In a third direction, the size of the limiting head is larger than the size of the neck. The cross-section of the groove cavity matches the limiting head and the neck, so that the limiting head can slide along the groove cavity and cannot disengage from the groove.

[0021] Beneficial effects: The limiting head of the slider is larger than the neck, and the cross-section of the groove cavity matches the limiting head. This ensures that when the slider slides in the groove along the first direction, the limiting head is always limited by the inner wall of the groove. This allows the slider to slide only along the predetermined track of the groove and prevents it from disengaging in the third direction. This enhances the stability and reliability of the groove assembly during movement and prevents accidental disengagement of the slider due to vibration, impact, or unexpected force, eliminating the need for additional anti-disengagement structures and simplifying the assembly process. Simultaneously, the limiting head provides a larger contact area. When the slider slides in the groove and bears loads in the second direction, the force is mainly transmitted through the contact surface between the limiting head and the inner wall of the groove. This large-area contact effectively disperses stress, reduces local pressure, improves load-bearing capacity and wear resistance, and extends the component's lifespan.

[0022] In one optional embodiment, the connecting assembly includes a first connecting hole in the variable diameter bar, a second connecting hole in the protective baffle, and a screw-in fastener. The first connecting hole and the second connecting hole are coaxial, and the screw-in fastener is installed in the first connecting hole and the second connecting hole. The inner wall of the second connecting hole has a circumferential connecting structure that matches the rod portion of the screw-in fastener.

[0023] Beneficial effects: By using screw-in fasteners and providing a circumferential connection structure on the inner wall of the second connection hole, after the screw-in fastener passes through the first connection hole and is screwed into the second connection hole, a large axial preload is generated, which firmly presses the reducing strip and the protective baffle together, enabling the connection node to withstand large tensile and shear forces, effectively resisting vibration, impact and separation forces during operation, and ensuring reliable connection.

[0024] In one optional embodiment, the sliding steel pipe pile internal expander for offshore wind power further includes a plurality of tooth plates, which are arranged circumferentially at intervals along the outer wall of the installation; wherein each tooth plate corresponds to a pair of protective baffles installed on both sides thereon, and each protective baffle is configured with a variable diameter strip connected thereto.

[0025] Beneficial effects: By using multiple toothed plates spaced circumferentially along the outer wall of the installation, the tightening force generated by the internal expander during its entry into the steel pipe pile is evenly applied to the pressure plate around the entire circumference, effectively dispersing the tightening load, reducing the risk of local stress concentration, and preventing the steel pipe pile from deforming or being damaged due to excessive local pressure. Furthermore, each toothed plate, along with its matching pair of protective baffles and two reducing strips, constitutes a relatively independent functional unit. If one or more toothed plate units wear out or are damaged, they can be replaced individually without the need to disassemble the entire internal expander. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 A perspective view of the internal expander of the sliding steel pipe pile for offshore wind power provided in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0029] Figure 3 This is a perspective view of the sliding expansion joint of the sliding steel pipe pile for offshore wind power provided in an embodiment of the present invention, in which the variable diameter bar is slidably installed in the second slide groove of the guide stop;

[0030] Figure 4 This is a side view of the variable diameter bar in the internal expander of the sliding steel pipe pile for offshore wind power when it is installed in place, according to an embodiment of the present invention.

[0031] Figure 5 for Figure 4 Cross-sectional view of section BB in the middle;

[0032] Figure 6 for Figure 4 A cross-sectional view of section CC.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Inner expander body; 101. Mounting outer wall; 102. First sliding groove;

[0035] 2. Protective baffle; 201. Limiting baffle; 202. Second sliding groove; 203. Second connecting hole;

[0036] 3. Variable diameter bar; 301. Slider; 302. Neck; 303. Limiting head; 304. First connecting hole;

[0037] 4. Guide baffle;

[0038] 5. Tooth plate;

[0039] K, first direction; L, second direction; M, third direction. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the installation of offshore wind turbine jacket foundations, the internal expansion joint, as a core piece of equipment for lifting and inserting steel pipe piles, directly impacts construction efficiency and safety through its structural design. In existing technologies, the internal expansion joint typically includes key components such as a toothed plate, protective baffles, and a reducing strip. The toothed plate is hydraulically driven to lift and tighten against the inner wall of the steel pipe pile, thus fixing the pile. Protective baffles are located on both sides of the toothed plate to protect it from impacts during the installation process. The reducing strip, through its height adjustment function, allows the outer diameter of the internal expansion joint to be as close as possible to the inner diameter of the steel pipe pile, minimizing the free extension distance of the toothed plate and optimizing the tightening effect. During installation, the protective baffle and the reducing strip are fixed together with multiple sets of bolts to ensure structural stability.

[0042] In actual construction, due to equipment wear or errors in the estimated diameter of the internal expander, frequent replacement of the reducing strip is necessary to ensure smooth insertion of the internal expander into the steel pipe pile. However, since multiple protective baffles are typically installed along the outer circumference of the internal expander, and these baffles are connected to the reducing strip with multiple bolts, replacing all the reducing strips requires tightening over 140 bolts, and then re-screwing these bolts after each replacement to complete the process. Therefore, replacing the reducing strip consumes a significant amount of valuable work time.

[0043] Therefore, this application reduces the time required to tighten and loosen bolts by sliding the reducing strip onto the protective baffle.

[0044] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0045] According to embodiments of the present invention, the provided sliding steel pipe pile internal expander for offshore wind power, such as... Figure 1 As shown, it includes an internal expander body 1, a protective baffle 2, and a reducing bar 3.

[0046] Among them, such as Figure 1 As shown, the inner expander body 1 is provided with an outer wall 101; the protective baffle 2 is fixedly installed on the outer wall 101; the variable diameter bar 3 is slidably connected to the protective baffle 2 through a sliding groove assembly, and the sliding direction is the first direction K. Along the first direction K, one side of the variable diameter bar 3 is fixed to the protective baffle 2 through a connecting assembly.

[0047] This design uses a sliding groove assembly to connect the reducing strip 3 to the protective baffle 2, and a connecting assembly to fix the reducing strip 3 to the protective baffle 2. When replacing the reducing strip 3, the operator only needs to release the fixing of the connecting assembly to slide the reducing strip 3 until it is detached from the protective baffle 2, and then complete the sliding installation of the new reducing strip 3. When it slides to the designated position, the connecting assembly is used to quickly fix it. Compared with the solution that requires a large number of bolts to install when replacing the reducing strip 3, the internal expander of this structure avoids disassembling a large number of bolts when replacing the reducing strip 3, shortens the time of replacing the reducing strip 3, simplifies the operation steps, and reduces the labor intensity of on-site construction personnel.

[0048] When the internal expander is lifted into the horizontally placed steel pipe pile, the protective baffle 2 may directly impact the outer wall of the steel pipe pile, affecting its service life.

[0049] Therefore, in one embodiment, such as Figures 1 to 4 As shown, the sliding steel pipe pile internal expander for offshore wind power also includes a guide baffle 4. Along the first direction K, the guide baffle 4 is installed on the side of the protective baffle 2 away from the connecting component through an elastic reset structure.

[0050] With this configuration, by installing the guide baffle 4 along the first direction K on the side of the protective baffle 2 away from the connecting components, the guide baffle 4 acts as a buffer contact, preferentially contacting the inner wall of the steel pipe pile. Due to the frequent swaying of the hull caused by wind and waves during offshore construction, the head of the internal expander (the area of ​​the protective baffle 2) may have a rigid collision with the inner wall of the steel pipe pile. Through the setting of the elastic reset structure, the impact force received by the guide baffle 4 is converted into elastic potential energy for absorption, avoiding the direct transmission of the impact force to the protective baffle 2 and its connected reducing strip 3. This reduces the risk of deformation, cracking or loosening of bolts in the protective baffle 2 due to collision, extends the maintenance cycle, and reduces labor and spare parts replacement costs.

[0051] Meanwhile, by providing guide baffles, it is helpful to adjust the center of the internal expander during the process of entering the steel pipe pile, thus reducing the difficulty of the internal expander entering the steel pipe pile.

[0052] It can be noted that the protective baffle 2 is welded and installed on the outer wall 101.

[0053] In one embodiment, such as Figure 1 and Figure 2 As shown, the inner expander body 1 is provided with a first slide groove 102; the guide baffle 4 is slidably installed in the first slide groove 102.

[0054] With this configuration, the guide baffle 4 can slide into the predetermined position along the first groove 102 in the inner expander body 1 during installation, eliminating the need for additional positioning tools and reducing the difficulty of manual operation. Simultaneously, it allows for temporary positioning and fine-tuning during installation, reducing the risk of installation errors such as component misalignment or displacement.

[0055] It should be noted that there are no specific limitations on the hooking of the elastic reset structure.

[0056] It should be noted that the elastic reset structure only includes the elastic reset element.

[0057] During installation, the elastic reset component is installed between the guide baffle 4 and the protective baffle 2, and the elastic deformation direction of the elastic reset component is parallel to the first direction K.

[0058] With this configuration, by aligning the elastic deformation direction of the elastic reset member with the first direction K, when the hull is rocked by waves or when the guide baffle 4 is impacted during installation, the guide baffle 4 moves along the sliding direction, compressing or stretching the elastic reset member. By absorbing the impact energy through elastic deformation, the kinetic energy is converted into elastic potential energy, reducing the risk of the impact force being directly transmitted to the protective baffle 2 and avoiding damage to the protective baffle 2 caused by rigid collisions.

[0059] Preferably, the elastic reset element is a linear spring.

[0060] It should be noted that there is no specific limit to the number of elastic reset components.

[0061] Preferably, there are multiple elastic reset members, such as two or more, in which case the multiple elastic reset members are arranged at intervals along the second direction L.

[0062] This configuration, by arranging multiple independent elastic reset elements at intervals along the second direction L, allows the impact force on the guide baffle to be distributed among multiple elastic reset elements, avoiding single-point overload and local stress concentration, forming a redundant design. If one elastic reset element fails due to fatigue after long-term use, other elastic reset elements can still maintain the buffering function, avoiding systemic failure and improving the reliability of the internal expander.

[0063] It can be noted that the shape of the guide baffle 4 is not specifically limited, it is only required to allow it to preferentially enter the interior of the steel pipe pile and to be preferentially impacted by the hull due to wave swaying or during installation.

[0064] Preferably, such as Figure 1 , Figure 3 and Figure 4 As shown, the guide baffle 4 is selected as a wedge.

[0065] That is, during the installation process, the guide baffle 4 is installed on the side of the protective baffle 2 that preferentially enters the steel pipe pile. When the internal expander is installed inside the steel pipe pile, although it will shake due to factors such as waves, the energy will preferentially act on the guide baffle 4 and transfer the energy to the elastic reset component, thereby achieving buffering, protecting the protective baffle 2, and extending its service life.

[0066] In use, the guide baffle 4 can slide within the elastic deformation stroke of the elastic reset member.

[0067] In one embodiment, such as Figure 1 and Figure 3 As shown, along the first direction K, the protective baffle 2 has a limiting baffle 201 on the side away from the connecting component; when the variable diameter strip 3 is slidably installed, the side away from the connecting component abuts against the limiting baffle 201.

[0068] With this configuration, the limiting baffle 201 is located on the side of the protective baffle 2 away from the connecting component. When the variable diameter bar 3 slides to the farthest position along the first direction K, its end will physically contact the limiting baffle 201, thereby forcibly terminating the sliding stroke and preventing the variable diameter bar 3 from detaching from the guide groove or colliding with the connecting component due to excessive sliding, thus preventing damage due to uncontrolled sliding.

[0069] In one embodiment, it remains as follows Figure 1 and Figure 3 As shown, the slide rail assembly includes a slider 301 disposed in one of the variable diameter bar 3 and the protective baffle 2, and a second slide rail 202 disposed in the other of the variable diameter bar 3 and the protective baffle 2. The side of the second slide rail 202 is open, and the slider 301 slides into the interior of the second slide rail 202 through the side opening of the second slide rail 202.

[0070] With this configuration, by providing an opening on the side of the second slide groove 202, the slider 301 can slide directly into the interior of the second slide groove 202 from the side opening during installation, reducing the precision requirements and operational difficulty of assembling the variable diameter strip 3 onto the guide plate.

[0071] In one embodiment, such as Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, the slider 301 includes a neck 302 and a limiting head 303. The neck 302 is connected to the reducing bar 3. The limiting head 303 is installed on the side of the neck 302 away from the reducing bar 3 along the third direction M. The size of the limiting head 303 is larger than the size of the neck 302. The cross-section of the groove cavity matches the limiting head 303 and the neck 302, so that the limiting head 303 can slide along the groove cavity and cannot disengage from the groove.

[0072] With this configuration, the limiting head 303 of the slider 301 is larger than the neck 302, and the cross-section of the groove cavity matches the limiting head 303. This ensures that when the slider 301 slides along the first direction K in the groove, the limiting head 303 is always limited by the inner wall of the groove, so that the slider 301 can only slide along the predetermined track of the groove and cannot disengage from the groove in the third direction M. This improves the stability and reliability of the groove assembly during movement and prevents the slider 301 from accidentally disengaging due to vibration, impact or accidental force. No additional anti-disengagement structure is needed, simplifying the assembly process.

[0073] Meanwhile, the limiting head 303 can provide a larger contact area. When the slider 301 slides in the groove and bears the load in the second direction L, the force is mainly transmitted through the contact surface between the limiting head 303 and the inner wall of the groove. By achieving a large area contact, stress can be effectively dispersed, local pressure can be reduced, load-bearing capacity and wear resistance can be improved, and component life can be extended.

[0074] In one embodiment, such as Figure 1 , Figures 3 to 5 As shown, the connecting assembly includes a first connecting hole 304 opened in the reducing bar 3, a second connecting hole 203 opened in the protective baffle 2, and a screw-in fastener. The first connecting hole 304 and the second connecting hole 203 are coaxial. The screw-in fastener is installed in the first connecting hole 304 and the second connecting hole 203. The inner wall of the second connecting hole 203 is provided with a circumferential connecting structure that matches the rod of the screw-in fastener.

[0075] With this configuration, by using screw-in fasteners and having a circumferential connection structure on the inner wall of the second connection hole 203, after the screw-in fastener passes through the first connection hole 304 and is screwed into the second connection hole 203, a large axial preload will be generated, which will firmly press the variable diameter strip 3 and the protective baffle 2 together, so that the connection node can withstand large tensile and shear forces, effectively resist vibration, impact and separation forces during the working process, and ensure reliable connection.

[0076] Preferably, the screw-in fastener is a bolt.

[0077] Furthermore, the first connecting hole 304 has a countersunk groove for receiving the bolt head.

[0078] It can be explained that during the lifting of the internal expansion device, the internal expansion device is mainly subjected to the downward friction force of the pile body in the vertical direction. The friction force is equal to the weight of the pile. At this time, the baffle side of the internal expansion device is aligned with the pile tip side of the steel pipe pile, which will reduce the force on the screw-in fastener. At this time, the external vertical force of the protective baffle 2 and the variable diameter strip 3 is mainly concentrated on the protective baffle 2 and the guide baffle 4.

[0079] Furthermore, to extend the life of the screw-in fastener, an additional screw-in fastener and a first connecting hole 304 and a second connecting hole 203 for its installation are provided.

[0080] In one embodiment, such as Figure 1 As shown, the sliding steel pipe pile internal expander for offshore wind power also includes multiple tooth plates 5, which are arranged circumferentially along the outer wall 101 of the installation. Each tooth plate 5 corresponds to a pair of protective baffles 2 installed on both sides of it, and each protective baffle 2 is equipped with a variable diameter strip 3 connected to it.

[0081] This configuration, by using multiple toothed plates 5 arranged circumferentially along the outer wall 101, ensures that the expansion force generated by the internal expander during its entry into the steel pipe pile is evenly applied to the pressure plate around the entire circumference, effectively dispersing the expansion load, reducing the risk of local stress concentration, and preventing the steel pipe pile from deforming or being damaged due to excessive local pressure.

[0082] Each toothed plate 5, along with its matching pair of protective baffles 2 and two reducing bars 3, constitutes a relatively independent functional unit. If one or more toothed plate 5 units are worn or damaged, they can be replaced individually without disassembling the entire internal expander.

[0083] It can be noted that in the above embodiments, the first direction K is the sliding direction and the length direction of the variable diameter strip 3, the second direction L is the height direction and the thickness direction, and the third direction M is the width direction.

[0084] It can be explained that when the internal expander is inserted into the horizontally placed steel pipe pile, the guide baffle 4 will compress the elastic reset member when it collides with the steel pipe pile. The elastic reset member will offset part of the impact energy, thereby reducing the force on the protective baffle 2, increasing the service life of the protective baffle 2, and improving the safety of operation.

[0085] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A sliding steel pipe pile internal expander for offshore wind power, characterized in that, include: The inner expander body (1) is provided with an outer wall (101) for mounting; The protective baffle (2) is fixedly installed on the outer wall of the mounting (101); The variable diameter bar (3) is slidably connected to the protective baffle (2) through a sliding groove assembly. The sliding direction is the first direction (K). Along the first direction (K), one side of the variable diameter bar (3) is fixed to the protective baffle (2) through a connecting assembly.

2. The sliding steel pipe pile internal expander for offshore wind power according to claim 1, characterized in that, The sliding steel pipe pile internal expander for offshore wind power also includes: A guide baffle (4) is installed along the first direction (K) on the side of the protective baffle (2) away from the connecting component via an elastic reset structure.

3. The sliding steel pipe pile internal expander for offshore wind power according to claim 2, characterized in that, The inner expander body (1) is provided with a first sliding groove (102); The guide baffle (4) is slidably installed in the first slide groove (102).

4. The sliding steel pipe pile internal expander for offshore wind power according to claim 2, characterized in that, The elastic reset structure includes an elastic reset member installed between the guide baffle (4) and the protective baffle (2), and the elastic deformation direction of the elastic reset member is parallel to the first direction (K).

5. The sliding steel pipe pile internal expander for offshore wind power according to claim 4, characterized in that, Multiple elastic reset elements are provided, and the multiple elastic reset elements are arranged at intervals along the second direction (L).

6. The sliding steel pipe pile internal expander for offshore wind power according to any one of claims 1-5, characterized in that, Along the first direction (K), the protective baffle (2) has a limiting baffle (201) on the side away from the connecting component; When the variable diameter strip (3) is slidably installed, the side of it away from the connecting component abuts against the limiting baffle (201).

7. The sliding steel pipe pile internal expander for offshore wind power according to any one of claims 1-5, characterized in that, The slide assembly includes a slider (301) disposed in one of the variable diameter bar (3) and the protective baffle (2), and a second slide (202) disposed in the other of the variable diameter bar (3) and the protective baffle (2). The side of the second slide (202) is open, and the slider (301) slides into the interior of the second slide (202) at the side opening of the second slide (202).

8. The sliding steel pipe pile internal expander for offshore wind power according to claim 7, characterized in that, The slider (301) includes a neck (302) and a limiting head (303). The neck (302) is connected to the variable diameter bar (3). The limiting head (303) is installed on the side of the neck (302) away from the variable diameter bar (3) along a third direction (M). The size of the limiting head (303) is larger than the size of the neck (302). The cross-section of the groove cavity matches the limiting head (303) and the constricted neck (302), so that the limiting head (303) can slide along the groove cavity and cannot detach from the groove.

9. The sliding steel pipe pile internal expander for offshore wind power according to any one of claims 1-5, characterized in that, The connecting assembly includes a first connecting hole (304) in the variable diameter bar (3), a second connecting hole (203) in the protective baffle (2), and a screw-in fastener. The first connecting hole (304) and the second connecting hole (203) are coaxial. The screw-in fastener is installed in the first connecting hole (304) and the second connecting hole (203). The inner wall of the second connecting hole (203) is provided with a circumferential connecting structure that matches the rod portion of the screw-in fastener.

10. The sliding steel pipe pile internal expander for offshore wind power according to any one of claims 1-5, characterized in that, The sliding steel pipe pile internal expander for offshore wind power also includes: Multiple toothed plates (5) are arranged at circumferential intervals along the mounting outer wall (101); Each of the toothed plates (5) corresponds to a pair of protective baffles (2) installed on both sides thereon, and each protective baffle (2) is equipped with a variable diameter strip (3) connected thereto.

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