Lug-free pile driving follower for offshore wind power jacket foundation, and installation method

Abstract

The present invention relates to the technical field of pile sinking construction. Disclosed are a lug-free pile driving follower for an offshore wind power jacket foundation, and an installation method. A self-locking pile gripper capable of self-locking by means of friction is combined with a hydraulic pile driver, and cooperates with an upper pile driving follower sleeve and a pile foundation positioning seat which is fixed on a working platform, such that the pile driving follower sleeve can only move downwards and not upwards. At the moment of hammering by the hydraulic pile driver, the self-locking pile gripper and the pile driving follower sleeve are locked, such that the hydraulic pile driver and the offshore working platform are locked for a short time, thereby strongly suppressing rebound of the hydraulic pile driver, ensuring that all the force is applied to a pile foundation, and thus improving the pile driving efficiency.

Description

Offshore wind turbine jacket foundation lugless pile driver and installation method Technical Field

[0001] This invention relates to the field of pile driving construction technology, specifically to a lugless pile driver and installation method for offshore wind power jacket foundations. Background Technology

[0002] With the accelerated development of offshore wind power projects and continuous exploration of the marine environment, the offshore wind power industry is gradually moving towards high-power and deep-sea areas. As offshore wind power moves into the deep sea, jacket-type and floating wind turbine foundations will play a key role. However, my country's floating wind power technology is still in the prototype testing and demonstration project stage. Therefore, jacket-type wind turbine foundations will be the mainstream in the near future. Since the top of the steel pipe piles of the jacket foundation is underwater, only a few meters above the mud surface, the hydraulic hammers currently used in China do not have the function of underwater hammering and driving piles. In order to sink the steel pipe piles to the design elevation, it is necessary to use long-distance pile driving.

[0003] The main pile driving method currently used is the lug-type pile driver. This method involves installing the pile driver in place using slings, with the pile driver acting as a substitute for the driving structure. The pile is driven by a hydraulic hammer. Analysis of this process reveals significant drawbacks: Firstly, the lug-type pile driver requires lugs to be installed at appropriate locations on the pile during the design and manufacturing phase. Therefore, it demands high standards in structural design and stress control; otherwise, the lugs risk detaching during high-energy pile driving. Secondly, the lug-type pile driver uses slings for placement, with the slings slightly longer than the pile driver. The slings are connected to the lugs and the main hook of the lifting equipment at both ends. After placement, the connection to the main hook is released, and the sling hangs freely to the construction platform. During pile driving, a dedicated person simultaneously retracts the sling. After pile driving is complete, the main hook is reconnected, and the pile driver is removed. The entire process is complex and poses safety hazards.

[0004] In addition, the pile drivers currently used in pile driving construction are placed on top of the pile by hoisting without additional fixation. When the ground resistance is high, the pile driver is prone to jumping up during pile driving, which may cause danger and affect the efficiency of pile driving. Summary of the Invention

[0005] The purpose of this invention is to provide a lugless pile driver and installation method for offshore wind turbine jacket foundations, in order to solve the problems mentioned in the background art, such as the complicated steps and safety hazards of the current traditional pile driving process.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a lugless pile driver for offshore wind turbine jacket foundations, comprising a hydraulic pile driver, wherein a self-locking pile clamp is fixedly connected to the lower end of the hydraulic pile driver, a pile foundation positioning seat is fixedly installed on an offshore work platform for pile driving operations, a steel pipe pile and a lugless pile driver are sequentially inserted into the pile foundation positioning seat, an insertion section is provided at the lower end of the lugless pile driver, the insertion section is inserted into the upper end of the steel pipe pile, and a pile driver sleeve is sleeved on the outside of the lugless pile driver;

[0007] The self-locking pile clamp includes a lifting ring, within which a large gear ring is movably mounted via bearings. A drive pinion meshes with the inner side of the large gear ring. The drive pinion is movably mounted on the lifting ring via angular support bearings. A cross-shaped connecting frame is fixedly connected to the hydraulic pile driver. A lifting guide rail is fixedly connected to the end of the cross-shaped connecting frame. A rotating sleeve is fixedly connected inside the lifting ring. The lower end of the lifting guide rail passes through the rotating sleeve at the center of the drive pinion, and a helical groove is formed on the lifting guide rail. The rotating sleeve and the helical groove... The slots interlock, and a clamping gear meshes on the inner side of the large gear ring. A clamping arm is fixedly connected to one side of the clamping gear, and an anti-slip clamping rod is rotatably connected to the end of the clamping arm. When the large gear ring rotates, it drives the clamping gear to rotate, which in turn causes the clamping arm to rotate inward. The anti-slip clamping rod is used for clamping. After clamping, the friction between the anti-slip clamping rod and the steel pipe pile will continue to pull the lifting ring downward, thereby further increasing the clamping force of the anti-slip clamping rod. In this way, the heavier the steel pipe pile, the greater the clamping force it receives, which can effectively prevent the steel pipe pile from slipping.

[0008] Furthermore, the drive pinion, rotating sleeve, and lifting guide rail are each provided with four sets. The four sets of drive pinions are evenly distributed inside the large gear ring, and the four sets of drive pinions are tightly meshed with the large gear ring. The four lifting guide rails are fixedly connected to the four corner ends of the cross connecting frame, thereby ensuring the stability of the self-locking pile clamp.

[0009] Furthermore, the hydraulic pile driver is equipped with a pile driver lifting ring at its upper end. The hydraulic pile driver is suspended on the first crane via the pile driver lifting ring. A pile clamp lifting lug is fixedly connected to each side of the lifting ring. The pile clamp lifting lug is suspended on the second crane. The two hydraulic pile drivers can work together to facilitate the adjustment of the posture of the hydraulic pile driver and the self-locking pile clamp.

[0010] Furthermore, the pile foundation positioning seat includes a disc positioning seat, which is fixedly installed on the offshore construction platform by bolts, and the installation position of the disc positioning seat corresponds to the pile driving coordinate point for positioning the pile driving position. A pile foundation positioning sleeve is fixedly connected to the disc positioning seat to prevent the steel pipe pile from deviating.

[0011] Furthermore, each side of the pile foundation positioning sleeve is provided with a locking block groove, and a trapezoidal locking block is provided in the locking block groove. A slider rod is also fixedly connected to the outside of the trapezoidal locking block. A pressure spring is provided on the outer sleeve of the slider rod. The pressure spring is locked between the inner wall of the locking block groove and the trapezoidal locking block, and is used to push the trapezoidal locking block inward and engage with the trapezoidal teeth.

[0012] Furthermore, the outer side of the pile driver sleeve is machined with trapezoidal teeth, which engage with a trapezoidal locking block. The inclined surface of the trapezoidal teeth faces downward. When the pile driver sleeve moves downward, the inclined surfaces of the trapezoidal locking block and the trapezoidal teeth slide, pushing the trapezoidal locking block outward and compressing the pressure spring. When the pile driver sleeve moves upward, the right-angled sides of the trapezoidal locking block and the trapezoidal teeth block each other, so that the pile driver sleeve can only move downward, and its upward movement will be blocked by the trapezoidal locking block.

[0013] Furthermore, the other end of the slider rod is movably connected to a disc block via a rotating shaft, and the rotating shaft is located at the edge of the disc block. An adjustment handle is also fixedly connected to the disc block.

[0014] Furthermore, the upper and lower ends of the pile driver without lifting lugs are respectively fixedly connected with an upper limit block and a lower limit block to limit the pile driver sleeve, and the distance between the upper limit block and the lower limit block is greater than the length of the pile driver sleeve.

[0015] Furthermore, the diameter of the pile foundation positioning sleeve is larger than that of the steel pipe pile, and the upper end of the pile foundation positioning sleeve is a flared opening, which facilitates the hoisting and positioning of the steel pipe pile.

[0016] This invention provides another technical solution: a method for installing a lugless pile driver for offshore wind turbine jacket foundations, comprising the following steps:

[0017] S1. Hanging the hydraulic pile driver: First, use the hook of the first crane to connect to the pile driver lifting ring on the hydraulic pile driver. Then, use two steel cables and hooks to connect the second crane to the two pile clamping lugs on the self-locking pile clamp.

[0018] S2. Picking up and positioning the steel pipe pile: Using the first crane, the hydraulic pile driver and self-locking pile clamp are moved to the position before the top of the steel pipe pile to be picked up. The second crane lifts the lifting ring upward, causing the anti-slip clamping bar of the self-locking pile clamp to spread out in all directions, leaving clamping space. At the same time, the second crane continues to lift to adjust the posture of the hydraulic pile driver and the self-locking pile clamp to be horizontal, and puts the self-locking pile clamp on the outside of the steel pipe pile. Then the second crane lowers the self-locking pile clamp, and the first crane lifts the hydraulic pile driver and the self-locking pile clamp together. The friction force is used to complete the clamping of the steel pipe pile by the self-locking pile clamp. Then the turning base is used to turn the steel pipe pile over. Then the crane rotates the boom to move the steel pipe pile to the pile driving position and make the steel pipe pile connect with the pile foundation positioning seat. The steel pipe pile is slowly lowered to complete the self-weight entry into the soil.

[0019] S3. First stage of pile driving: After the steel pipe pile is hoisted, the hydraulic pile driver is lowered. The hydraulic pile driver descends, which drives the lifting guide rail to descend, causing the self-locking pile clamp to release. Then, the hydraulic pile driver is started to carry out pile driving. The self-locking pile clamp provides support during pile driving to prevent the hydraulic pile driver from shaking. When the lower end of the self-locking pile clamp is about 1m away from the pile foundation positioning seat, the first stage of pile driving is completed.

[0020] S4. Picking up and positioning the lugless pile driver: Using the first crane, move the hydraulic pile driver and self-locking pile clamp to the position in front of the top of the lugless pile driver to be picked up. Using the second crane, lift the lifting ring upwards, so that the anti-slip clamping bar of the self-locking pile clamp spreads out to the sides, leaving clamping space. At the same time, the second crane continues to lift to adjust the posture of the hydraulic pile driver and the self-locking pile clamp to be horizontal, and put the self-locking pile clamp on the outside of the pile driver sleeve. Then, the second crane lowers the self-locking pile clamp, and the first crane lifts the hydraulic pile driver and the self-locking pile clamp together, using friction to complete the clamping of the self-locking pile clamp on the pile driver sleeve. Then, using the turning base, the lugless pile driver is turned over. Then, the crane rotates the boom to move the lugless pile driver to the pile driving position, and makes the lugless pile driver dock with the pile foundation positioning seat. Slowly lower the lugless pile driver so that the insertion section at the lower end of the lugless pile driver is inserted into the upper end of the steel pipe pile, completing the positioning of the lugless pile driver.

[0021] S5. Second stage of pile driving: After the pile driver without lifting lugs is installed, start the hydraulic pile driver to drive the pile driver into the predetermined depth, thus completing the second stage of pile driving.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. This invention relates to a lugless pile driver and installation method for offshore wind power jacket foundations. By using a lugless pile driver, a self-locking pile clamp combined with a pile driver is used to clamp and install the steel pipe pile and the pile driver. No additional crane assistance is required, nor is it necessary to connect and unhook the slings. The self-locking pile clamp can automatically clamp the pile foundation and the pile driver when lifting, and can automatically unlock after being hoisted into place. This greatly simplifies the pile driving process. The original process takes about 36 hours to drive a pile at one location, while the new process is expected to complete it within 30 hours, significantly improving work efficiency.

[0024] 2. The present invention relates to a lugless pile driver and installation method for offshore wind power jacket foundations. This invention combines a self-locking pile clamp that utilizes friction for self-locking with a hydraulic pile driver. This, along with the pile driver sleeve and a pile positioning seat fixed to the working platform, ensures that the pile driver sleeve can only move downwards and not upwards. At the moment of impact by the hydraulic pile driver, the self-locking pile clamp and the pile driver sleeve lock together, resulting in a brief lock-up of the hydraulic pile driver and the offshore working platform. This strongly suppresses the upward movement of the hydraulic pile driver, ensuring that all force is applied to the pile foundation, thus improving pile driving efficiency. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the working position structure of the present invention;

[0026] Figure 2 is a schematic diagram of the hydraulic pile driver of the present invention;

[0027] Figure 3 is a schematic diagram of the self-locking pile clamp of the present invention;

[0028] Figure 4 is a schematic diagram of the casing structure of the pile driver of the present invention;

[0029] Figure 5 is a schematic diagram of the pile foundation positioning seat structure of the present invention;

[0030] Figure 6 is a schematic diagram of the structure of the pile foundation positioning seat and the pile driver sleeve of the present invention.

[0031] Numbered in the diagram: 1. Hydraulic pile driver; 101. Pile driver lifting ring; 2. Self-locking pile clamp; 201. Lifting ring; 202. Large gear ring; 203. Drive pinion; 204. Cross connecting frame; 205. Lifting guide rail; 206. Rotary sliding sleeve; 207. Spiral groove; 208. Clamping gear; 209. Clamping arm; 210. Anti-slip clamping bar; 211. Pile clamp lifting lug; 3. Pile foundation fixing... 301. Positioning seat; 302. Pile foundation positioning sleeve; 303. Locking block groove; 304. Trapezoidal locking block; 305. Sliding rod; 306. Pressure spring; 307. Disc locking block; 308. Adjusting handle; 4. Steel pipe pile; 5. Pile driver without lifting lugs; 501. Insertion section; 502. Upper limit block; 503. Lower limit block; 6. Pile driver sleeve; 601. Trapezoidal teeth. Detailed Implementation

[0032] 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, and 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.

[0033] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0034] Please refer to Figures 1-6. The offshore wind turbine jacket foundation lugless pile driver includes a hydraulic pile driver 1. The upper end of the hydraulic pile driver 1 is equipped with a pile driver lifting ring 101. The hydraulic pile driver 1 is suspended on a crane through the pile driver lifting ring 101. The lower end of the hydraulic pile driver 1 is fixedly connected to a self-locking pile clamp 2. The self-locking pile clamp 2 uses gravity and friction to self-lock and complete the hoisting of the steel pipe pile 4 and the lugless pile driver 5.

[0035] The offshore work platform used for pile driving operations is fixedly installed with a pile foundation positioning seat 3. The steel pipe pile 4 is driven under the limitation of the pile foundation positioning seat 3. When the upper end of the steel pipe pile 4 sinks to the pile foundation positioning seat 3 and cannot continue the pile driving operation, the insertion section 501 at the lower end of the pile driver 5 without lifting lugs is inserted into the steel pipe pile 4 to extend it so that the pile driving operation can continue.

[0036] As shown in Figures 2 and 3, the self-locking pile clamp 2 includes a lifting ring 201. A large gear ring 202 is movably mounted inside the lifting ring 201 via bearings. A drive pinion 203 meshes inside the large gear ring 202. Four sets of drive pinions 203 are provided. The drive pinions 203 are movably mounted on the lifting ring 201 via angular support bearings. A cross connecting frame 204 is fixedly connected to the hydraulic pile driver 1. A lifting guide rail 205 is fixedly connected to the end of the cross connecting frame 204. A rotating sleeve 206 is fixedly connected inside the lifting ring 201. The lower end of the lifting guide rail 205 passes through the rotating sleeve 206 at the center of the drive pinion 203. A spiral groove 207 is provided on the lifting guide rail 205. The rotating sleeve 206 and the spiral groove 207 are interlocked. When the rotating sleeve 206 slides up and down along the lifting guide rail 205... When the rotating sleeve 206 rotates along the spiral groove 207, it drives the drive pinion 203 to rotate, which in turn drives the large gear ring 202 to rotate. In addition, four sets of clamping gears 208 are meshed on the inner side of the large gear ring 202. A clamping arm 209 is fixedly connected to one side of the clamping gear 208. An anti-slip clamping rod 210 is rotatably connected to the end of the clamping arm 209. When the large gear ring 202 rotates, it drives the clamping gear 208 to rotate, which causes the clamping arm 209 to rotate inward. The anti-slip clamping rod 210 is used for clamping. After clamping, the friction between the anti-slip clamping rod 210 and the steel pipe pile 4 will continue to pull the lifting ring 201 downward, thereby further increasing the clamping force of the anti-slip clamping rod 210. In this way, the heavier the steel pipe pile 4, the greater the clamping force it receives, which can effectively prevent the steel pipe pile 4 from slipping.

[0037] Additionally, each side of the lifting ring 201 is fixedly connected to a pile clamping lug 211 for connecting steel cables to suspend it on a crane. This allows the crane to lift the lifting ring 201, causing the drive pinion 203, large gear ring 202, and clamping gear 208 to rotate in opposite directions. This, in turn, causes the anti-slip clamping rod 210 to retract outwards, releasing its grip on the steel pipe pile 4. Furthermore, it can be used in conjunction with the crane lifting the hydraulic pile driver 1 to change the posture of the hydraulic pile driver 1, allowing the hydraulic pile driver 1 and the self-locking pile clamp 2 to be placed sideways. The steel pipe pile 4 and the pile driver 5 without lifting lugs, which are placed upside down on the ship, are lifted. During the lifting, the steel pipe pile 4 will pull the lifting ring 201 through friction, which will cause the anti-slip clamping rod 210 to clamp the steel pipe pile 4. Then the steel pipe pile 4 is lifted and installed in place. After it is in place, the bottom of the steel pipe pile 4 contacts the seabed and is supported, so it will no longer exert a downward pulling force on the lifting ring 201. At this time, the crane lifts the lifting ring 201 and the anti-slip clamping rod 210 will spread out in all directions, stopping the clamping of the steel pipe pile 4, which facilitates the pile driving operation.

[0038] As shown in Figures 5 and 6, the pile foundation positioning seat 3 includes a disc positioning seat 301, which is fixedly installed on the offshore construction platform by bolts. The installation position of the disc positioning seat 301 corresponds to the pile driving coordinate point. A pile foundation positioning sleeve 302 is fixedly connected to the disc positioning seat 301. The diameter of the pile foundation positioning sleeve 302 is larger than that of the steel pipe pile 4, and the upper end of the pile foundation positioning sleeve 302 is a flared mouth to facilitate the hoisting and positioning of the steel pipe pile 4.

[0039] On both sides of the pile positioning sleeve 302, there is a locking block groove 303. A trapezoidal locking block 304 is installed inside the locking block groove 303. Correspondingly, a pile driver sleeve 6 is sleeved on the outside of the pile driver 5 without lifting lugs. Trapezoidal teeth 601 are machined on the outside of the pile driver sleeve 6. The trapezoidal teeth 601 engage with the trapezoidal locking block 304. A slider rod 305 is fixedly connected to the outside of the trapezoidal locking block 304. A pressure spring 306 is sleeved on the slider rod 305. The pressure spring 306 is locked in the locking block groove 303. Between the inner wall and the trapezoidal locking block 304, the trapezoidal locking block 304 is pushed inward to engage with the trapezoidal teeth 601. When the pile driver sleeve 6 moves downward, the inclined surfaces of the trapezoidal locking block 304 and the trapezoidal teeth 601 slide, pushing the trapezoidal locking block 304 outward and compressing the pressure spring 306. When the pile driver sleeve 6 moves upward, the right-angled sides of the trapezoidal locking block 304 and the trapezoidal teeth 601 block each other, so that the pile driver sleeve 6 can only move downward, and its upward movement will be blocked by the trapezoidal locking block 304.

[0040] Additionally, the other end of the slider rod 305 is movably connected to a disc block 307 via a rotating shaft, and the rotating shaft is located at the edge of the disc block 307. An adjusting handle 308 is also fixedly connected to the disc block 307. When the disc block 307 is rotated via the adjusting handle 308, the rotating shaft will move eccentrically, thereby pulling the slider rod 305 outward, which in turn causes the trapezoidal block 304 to retract into the block groove 303, no longer blocking the upward movement of the pile driver sleeve 6, so that the pile driver sleeve 6 can be pulled out.

[0041] As shown in Figure 4, the upper and lower ends of the lugless pile driver 5 are fixedly connected to an upper limit block 502 and a lower limit block 503, respectively, to limit the movement of the pile driver sleeve 6. The distance between the upper limit block 502 and the lower limit block 503 is greater than the length of the pile driver sleeve 6, facilitating the vertical sliding of the pile driver sleeve 6. During pile driving, the pile driver sleeve 6 is located at the bottom, and the upper end of the lugless pile driver 5 protrudes a certain distance from the pile driver sleeve 6. When the hydraulic pile driver 1 is working, the hammer of the hydraulic pile driver 1 falls and strikes the lugless pile driver 5, causing the hydraulic pile driver 1 to be reversed. The upward force pushes the hydraulic pile driver 1 upward, which in turn drives the lifting guide rail 205 to move upward, causing the self-locking pile clamp 2 to further clamp the pile feeder sleeve 6. The trapezoidal teeth 601 on the outside of the pile feeder sleeve 6 can also prevent slippage, so that the hydraulic pile driver 1 locks with the pile feeder sleeve 6 at the moment of hammering. At the same time, the pile feeder sleeve 6 is locked to the offshore operation platform through the locking connection of the pile foundation positioning seat 3. Thus, the hydraulic pile driver 1 is locked on the offshore operation platform and cannot jump upward. Therefore, all the force is applied to the pile feeder 5 without lifting lugs, which improves the pile driving efficiency.

[0042] The installation method of the lug-less pile driver for offshore wind turbine jacket foundations includes the following steps:

[0043] S1. Hanging the hydraulic pile driver 1: First, the first crane hook is connected to the pile driver lifting ring 101 on the hydraulic pile driver 1. Then, the second crane uses two steel cables and hooks to connect to the two pile clamping lugs 211 on the self-locking pile clamp 2 respectively.

[0044] S2. Picking up and positioning the steel pipe pile 4: Using the first crane, the hydraulic pile driver 1 and the self-locking pile clamp 2 are moved to the position in front of the top of the steel pipe pile 4 to be picked up. The second crane lifts the lifting ring 2 upward, so that the anti-slip clamping bar 210 of the self-locking pile clamp 2 spreads out to the four sides, leaving clamping space. At the same time, the second crane continues to lift to adjust the posture of the hydraulic pile driver 1 and the self-locking pile clamp 2 to be horizontal, and puts the self-locking pile clamp 2 on the outside of the steel pipe pile 4. Then the second crane lowers the self-locking pile clamp 2, and the first crane lifts the hydraulic pile driver 1 and the self-locking pile clamp 2 together. The self-locking pile clamp 2 clamps the steel pipe pile 4 by friction. Then, the turning base is used to turn the steel pipe pile 4 over. Then the crane rotates the boom to move the steel pipe pile 4 to the pile driving position and make the steel pipe pile 4 connect with the pile foundation positioning seat 3. The steel pipe pile 4 is slowly lowered to complete the self-weight entry into the soil.

[0045] S3. First stage of pile driving: After the steel pipe pile 4 is hoisted, the hydraulic pile driver 1 is lowered. The hydraulic pile driver 1 descends, thereby driving the lifting guide rail 205 to descend, causing the self-locking pile clamp 2 to release. Then, the hydraulic pile driver 1 is started to carry out pile driving operation. The self-locking pile clamp 2 provides support during pile driving to prevent the hydraulic pile driver 1 from shaking. When the lower end of the self-locking pile clamp 2 is about 1m away from the pile foundation positioning seat, the first stage of pile driving is completed.

[0046] S4. Picking up and positioning the lugless pile driver 5: Using the first crane, move the hydraulic pile driver 1 and the self-locking pile clamp 2 to a position in front of the top of the lugless pile driver 5 to be picked up. Using the second crane, lift the lifting ring 2 upwards, causing the anti-slip clamping rods 210 of the self-locking pile clamp 2 to spread outwards, leaving clamping space. At the same time, the second crane continues to lift, adjusting the posture of the hydraulic pile driver 1 and the self-locking pile clamp 2 to be horizontal, and placing the self-locking pile clamp 2 on the outside of the pile driver sleeve 6. Then, the second crane lowers the self-locking pile clamp. 2. The first crane lifts the hydraulic pile driver 1 and the self-locking pile clamp 2 together, and uses friction to clamp the self-locking pile clamp 2 onto the pile driver sleeve 6. Then, using the turning base, the pile driver 5 without lifting lugs is turned over. Next, the crane rotates the boom to move the pile driver 5 without lifting lugs to the pile driving position, and makes the pile driver 5 without lifting lugs dock with the pile foundation positioning seat 3. The pile driver 5 without lifting lugs is slowly lowered, so that the insertion section 501 at the lower end of the pile driver 5 without lifting lugs is inserted into the upper end of the steel pipe pile 4, thus completing the positioning of the pile driver 5 without lifting lugs.

[0047] S5. Second stage of pile driving: After the pile driver 5 without lifting lugs is hoisted, the hydraulic pile driver 1 is started to drive the pile driver 5 without lifting lugs into the predetermined depth, thus completing the second stage of pile driving.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lugless pile driver for offshore wind turbine jacket foundations, comprising a hydraulic pile driver (1), characterized in that: The hydraulic pile driver (1) is fixedly connected to a self-locking pile clamp (2) at its lower end. A pile foundation positioning seat (3) is fixedly installed on the offshore working platform used for pile driving operations. A steel pipe pile (4) and a pile driver without lifting lugs (5) are sequentially passed through the pile foundation positioning seat (3). The pile driver without lifting lugs (5) is provided with an insertion section (501) at its lower end. The insertion section (501) is inserted into the upper end of the steel pipe pile (4). A pile driver sleeve (6) is sleeved on the outside of the pile driver without lifting lugs (5). The self-locking pile clamp (2) includes a lifting ring (201), a large gear ring (202) is movably mounted inside the lifting ring (201) via a bearing, a driving pinion (203) meshes inside the large gear ring (202), and the driving pinion (203) is movably mounted on the lifting ring (201) via an angular support bearing. A cross connecting frame (204) is fixedly connected to the hydraulic pile driver (1), and a lifting guide rail (205) is fixedly connected to the end of the cross connecting frame (204). The lifting ring (201) is internally fixed. A rotating sleeve (206) is connected to the lifting guide rail (205). The lower end of the lifting guide rail (205) passes through the rotating sleeve (206) at the center of the driving pinion (203). A spiral groove (207) is provided on the lifting guide rail (205). The rotating sleeve (206) and the spiral groove (207) are fitted together. A clamping gear (208) is meshed on the inner side of the large gear ring (202). A clamping arm (209) is fixedly connected to one side of the clamping gear (208). An anti-slip clamping rod (210) is rotatably connected to the end of the clamping arm (209).

2. The lugless pile driver for offshore wind turbine jacket foundations according to claim 1, characterized in that: The drive pinion (203), the rotating sleeve (206), and the lifting guide rail (205) are all provided with four sets. The four sets of drive pinions (203) are evenly distributed inside the large gear ring (202). The four sets of drive pinions (203) are tightly meshed with the large gear ring (202). The four lifting guide rails (205) are fixedly connected to the four corner ends of the cross connecting frame (204).

3. The lugless pile driver for offshore wind turbine jacket foundations according to claim 1, characterized in that: The hydraulic pile driver (1) is provided with a pile driver lifting ring (101) at the upper end. The hydraulic pile driver (1) is suspended on the first crane through the pile driver lifting ring (101). A pile clamping lug (211) is fixedly connected to each side of the lifting ring (201). The pile clamping lug (211) is suspended on the second crane.

4. The lugless pile driver for offshore wind turbine jacket foundations according to claim 1, characterized in that: The pile foundation positioning seat (3) includes a disc positioning seat (301), which is fixedly installed on the offshore construction platform by bolts, and the installation position of the disc positioning seat (301) corresponds to the pile driving coordinate point. A pile foundation positioning sleeve (302) is fixedly connected to the disc positioning seat (301).

5. The lugless pile driver for offshore wind turbine jacket foundations according to claim 4, characterized in that: The pile foundation positioning sleeve (302) is provided with a locking block groove (303) on each side. A trapezoidal locking block (304) is provided in the locking block groove (303). A slider rod (305) is fixedly connected to the outside of the trapezoidal locking block (304). A pressure spring (306) is provided on the outside of the slider rod (305). The pressure spring (306) is locked between the inner wall of the locking block groove (303) and the trapezoidal locking block (304).

6. The lugless pile driver for offshore wind turbine jacket foundations according to claim 5, characterized in that: The outer side of the pile driver sleeve (6) is machined with trapezoidal teeth (601), which engage with trapezoidal blocks (304), with the inclined surface of the trapezoidal teeth (601) facing downwards.

7. The lugless pile driver for offshore wind turbine jacket foundations according to claim 5, characterized in that: One end of the slider rod (305) is movably connected to a disc block (307) via a rotating shaft, and the rotating shaft is located at the edge of the disc block (307). An adjusting handle (308) is also fixedly connected to the disc block (307).

8. The lugless pile driver for offshore wind turbine jacket foundations according to claim 4, characterized in that: The upper end of the pile driver (5) without a lifting lug is fixedly connected to an upper limit block (502), and the lower end of the pile driver (5) without a lifting lug is fixedly connected to a lower limit block (503). The distance between the upper limit block (502) and the lower limit block (503) is greater than the length of the pile driver sleeve (6).

9. The lugless pile driver for offshore wind turbine jacket foundations according to claim 1, characterized in that: The diameter of the pile foundation positioning sleeve (302) is larger than that of the steel pipe pile (4), and the upper end of the pile foundation positioning sleeve (302) is a flared mouth.

10. The installation method of the lugless pile driver for offshore wind turbine jacket foundation according to any one of claims 1-9, characterized in that: Includes the following steps: S1. Hanging the hydraulic pile driver (1): First, use the hook of the first crane to connect with the pile driver lifting ring (101) on the hydraulic pile driver (1), and then use two steel cables and hooks to connect with the two pile clamping lugs (211) on the self-locking pile clamp (2) respectively. S2. Picking up and positioning the steel pipe pile (4): Using the first crane, the hydraulic pile driver (1) and the self-locking pile clamp (2) are moved to the position in front of the top of the steel pipe pile (4) to be picked up. Using the second crane, the lifting ring (2) is lifted upward, so that the anti-slip clamping bar (210) of the self-locking pile clamp (2) spreads out to the four sides, leaving clamping space. At the same time, the second crane continues to lift to adjust the posture of the hydraulic pile driver (1) and the self-locking pile clamp (2) to be horizontal, and the self-locking pile clamp (2) is placed on the steel pipe. Outside the pile (4), the second crane lowers the self-locking pile clamp (2), the first crane lifts the hydraulic pile driver (1) and the self-locking pile clamp (2) together, and uses friction to clamp the steel pipe pile (4) with the self-locking pile clamp (2). Then, using the turning base, the steel pipe pile (4) is turned over. Then, the crane rotates the boom to move the steel pipe pile (4) to the pile driving position and makes the steel pipe pile (4) dock with the pile foundation positioning seat (3). The steel pipe pile (4) is slowly lowered to complete the self-weight entry into the soil. S3. First stage of pile driving: After the steel pipe pile (4) is hoisted, the hydraulic pile driver (1) is lowered. The hydraulic pile driver (1) descends, thereby driving the lifting guide rail (205) to descend, causing the self-locking pile clamp (2) to release. Then, the hydraulic pile driver (1) is started to carry out pile driving. The self-locking pile clamp (2) provides support during pile driving to prevent the hydraulic pile driver (1) from shaking. When the lower end of the self-locking pile clamp (2) is 1m away from the pile foundation positioning seat, the first stage of pile driving is completed. S4. Picking up and positioning the lugless pile driver (5): Using the first crane, move the hydraulic pile driver (1) and the self-locking pile clamp (2) to the position in front of the top of the lugless pile driver (5) to be picked up. Using the second crane, lift the lifting ring (2) upward, so that the anti-slip clamping bar (210) of the self-locking pile clamp (2) spreads out to leave clamping space. At the same time, the second crane continues to lift to adjust the posture of the hydraulic pile driver (1) and the self-locking pile clamp (2) to be horizontal, and put the self-locking pile clamp (2) on the outside of the pile driver sleeve (6). Then the second crane lowers the self-locking pile clamp (2). The first crane lifts the hydraulic pile driver (1) and the self-locking pile clamp (2) together, and uses friction to clamp the self-locking pile clamp (2) onto the pile driver sleeve (6). Then, using the turning base, the pile driver (5) without lifting lugs is turned over. Then, the crane rotates the boom to move the pile driver (5) without lifting lugs to the pile driving position, and makes the pile driver (5) without lifting lugs dock with the pile foundation positioning seat (3). The pile driver (5) without lifting lugs is slowly lowered, so that the insertion section (501) at the lower end of the pile driver (5) is inserted into the upper end of the steel pipe pile (4), and the positioning of the pile driver (5) without lifting lugs is completed. S5. Second stage of pile driving: After the pile driver (5) without lifting lugs is hoisted, start the hydraulic pile driver (1) to drive the pile driver (5) without lifting lugs into the predetermined depth, thus completing the second stage of pile driving.

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