Method for dismantling offshore wind turbine steel pipe piles

Abstract

The application discloses a kind of offshore wind power steel pipe pile dismantling method, comprising the following steps: step one, ship machine enters point anchor throwing;Step two, install two temporary lifting lugs on the flange on the top of pile;Step three, remove the inner platform plate in steel pipe pile;Step four, suction in pile;Step five, cutting pile device is placed;Step six, steel pipe pile hangs buckle;Step seven, cutting pile device is lowered to cutting pile position and is stabilized fixed position;Step eight, cutting pile operation;Step nine, cutting pile device is lifted to the top of pile and is stabilized fixed position;Step ten, hoist and cut the steel pipe pile;Step eleven, cut the steel pipe pile tailing;Step twelve, cut the steel pipe pile falls barge;Step thirteen, cutting pile device is pulled out from the inside of cut steel pipe pile;Step fourteen, ship machine is withdrawn point.The dismantling method of the application avoids various risks faced by manual underwater cutting pile operation, thereby greatly improving the dismantling efficiency of abandoned offshore wind power steel pipe pile.

Description

Technical Field

[0001] This invention relates to a method for dismantling offshore wind turbine steel pipe piles. Background Technology

[0002] Offshore wind power, as a clean and renewable energy source, has developed rapidly in my country in recent years. With continuous experience accumulation, the industry has achieved mature technology. Monopile foundations, as a type of offshore wind turbine foundation, are simple in structure, highly efficient in offshore construction, and economically viable. Therefore, monopile foundation structures are widely used in the construction of existing offshore wind farms. However, with continuous technological development and progress, the capacity of single offshore wind turbines is becoming increasingly larger, and small-capacity models will eventually be phased out. Furthermore, due to future development plans around the wind farm, completed turbine sites may affect subsequent related plans, necessitating the removal of steel pipe piles already submerged on the seabed. Since steel pipe piles are generally long, complete removal is difficult and costly. Therefore, the industry uses a method of cutting the steel pipe pile at a certain elevation below the mud surface, and then lifting out the upper part of the pile. This method of removing steel pipe piles is more feasible and economical than complete removal.

[0003] The traditional method of manually diving underwater to cut steel pipe piles is difficult, dangerous, and inefficient. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a method for dismantling offshore wind power steel pipe piles. This method avoids the various risks faced by manual underwater pile cutting operations, thereby greatly improving the dismantling efficiency of abandoned offshore wind power steel pipe piles.

[0005] The objective of this invention is achieved as follows: a method for dismantling offshore wind turbine steel pipe piles, comprising the following steps:

[0006] Step 1: The crane ship enters the dock and anchors, the transport barge is moored to the starboard side of the crane ship, the dredger enters the dock and anchors, and the pile cutting device is placed on the deck of the crane ship.

[0007] Step two: The workers enter the inner platform inside the steel pipe pile through the hoist cage, and install two temporary lifting lugs symmetrically on the top flange of the steel pipe pile.

[0008] Step 3: The workers stand on the inner platform ring plate on the outer edge of the inner platform plate to remove the inner platform plate. After removal, the inner platform plate is lifted onto the deck of the transport barge by a crane ship.

[0009] Step four: Use a dredging vessel to suction mud from inside the steel pipe piles;

[0010] Step 5: First, install two connecting fixtures symmetrically on the top flange of the pile. The auxiliary hook of the crane ship is connected to four lifting lugs fixed on the top surface of the pile cutting device through the lifting wire rope. Then, lift the pile cutting device to the top of the steel pipe pile and lower it to the inner platform ring plate of the steel pipe pile. Then, connect the winch wire ropes on the two winches installed on the top surface of the pile cutting device to the two connecting fixtures one by one through shackles. By remotely controlling the two winches to tighten the two winch wire ropes one by one, the auxiliary hook of the crane ship can be unhooked.

[0011] Step 6: The main hook of the crane vessel is hooked to two temporary lifting lugs fixed on the flange at the top of the pile via the lifting wire rope.

[0012] Step 7: By remotely controlling the two winches on the pile cutting device, the pile cutting device is lowered to the specified elevation below the mud surface. By remotely controlling the piston rods of the four stabilizing support cylinders on the pile cutting device to extend, the rollers at the ends of the piston rods of the four stabilizing support cylinders are firmly pressed against the inner wall of the steel pipe pile.

[0013] Step 8: By remotely controlling the four radially evenly distributed pile-cutting cylinders on the rotary cutting platform of the pile-cutting device, the four plasma cutting torches, which are installed one-to-one on the piston rods of the four pile-cutting cylinders, are brought into contact with the inner wall of the steel pipe pile. Then, the four plasma cutting torches are started remotely to carry out the pile-cutting operation. After the initial point is cut through, the servo motor that drives the rotary cutting platform is remotely controlled to rotate the rotary cutting platform around the axis, thereby driving the four plasma cutting torches to achieve a complete circumferential cutting motion.

[0014] Step 9: After the steel pipe pile is cut, the piston rods of the four pile cutting cylinders and the four stabilizing support cylinders are retracted one after another. Then, by remotely controlling the two winches, the pile cutting device is raised to the top of the cut steel pipe pile and is at the same level as the inner platform ring plate. By remotely controlling the piston rods of the four stabilizing support cylinders, the entire pile cutting device is firmly supported on the pile wall of the cut steel pipe pile.

[0015] Step 10: After the pile cutting device is lifted to the top of the cut steel pipe pile and firmly supported on the pile wall, the main hook of the crane can lift the cut steel pipe pile.

[0016] Step 11: When the bottom of the cut steel pipe pile is 1m above the deck of the crane ship, the cut steel pipe pile is tailed by the turning clamp on the auxiliary hook of the crane ship. By controlling the main hook and auxiliary hook of the crane ship, the cut steel pipe pile is changed from a vertical state to a horizontal state.

[0017] Step 12: Lower the horizontally cut steel pipe piles onto the deck of the transport barge, and then detach the main hook and auxiliary hook of the crane ship.

[0018] Step thirteen: Use a pull-out tool to pull the pile cutting device out from inside the cut steel pipe pile;

[0019] Step fourteen: After the crane vessel and transport barge complete their work, they will be removed from the site. The dredging vessel can be removed from the site ahead of schedule after completing its dredging work.

[0020] The above-mentioned method for dismantling offshore wind turbine steel pipe piles includes a pull-out tool with a crank structure, comprising a flange joint, a lower vertical section, an inclined section, an upper vertical section, and a transverse section connected sequentially from bottom to top. The flange joint includes two parallel flange plates and a support pipe connecting the two flange plates. The lower end of the lower vertical section is connected to the outer surface of the support pipe of the flange joint. The transverse length of the inclined section is greater than the straight-line distance between the top of the pile cutting device and the top of the steel pipe pile. The sum of the lengths of the lower vertical section, the vertical length of the inclined section, and the upper vertical section is greater than the outer radius of the steel pipe pile. The top surface of the transverse section... A lifting lug is provided at the top; the flange joint, lower vertical section and inclined section of the pulling-out tool are extended from the top of the pile into the interior of the cut steel pipe pile, and a flange plate on the flange joint is connected to the device flange fixed at the top center of the pile cutting device, so that the horizontal section of the pulling-out tool is located outside the cut steel pipe pile and parallel to the outer wall of the cut steel pipe pile, and the lifting lug on the horizontal section is aligned with the center of gravity of the combination of the pulling-out tool and the pile cutting device on the same vertical line. Then the crane hook is connected to the lifting lug, and the piston rods of the four stabilizing support cylinders are retracted through remote control. At the same time, the pile cutting device is pulled out from the cut steel pipe pile by controlling the crane.

[0021] The method for dismantling offshore wind turbine steel pipe piles of the present invention has the following characteristics:

[0022] (1) The present invention adopts a remote control mode, which can better realize the underwater cutting operation of offshore wind power steel pipe piles and avoid the safety risks of underwater operation using the traditional manual pile cutting method.

[0023] (2) The present invention sets a speed sensor in the winch of the pile cutting device, and can calculate the elevation of the pile cutting device in real time through a certain algorithm. Compared with the traditional pile cutting method, it improves the cutting accuracy of steel pipe piles and avoids secondary construction.

[0024] (3) The present invention is equipped with a real-time monitoring mechanism in the pile cutting device, which can remotely monitor the cutting status of the steel pipe pile, ensure the safety and reliability of the construction process, and thus greatly improve the demolition efficiency of offshore wind power steel pipe piles. Attached Figure Description

[0025] Figure 1 This is a flowchart of the method for dismantling offshore wind turbine steel pipe piles according to the present invention;

[0026] Figure 2 This is a state diagram of the offshore wind power steel pipe pile dismantling method of the present invention during step one;

[0027] Figure 3 This is a state diagram of the second step in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0028] Figure 4 This is a state diagram of step three in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0029] Figure 5 This is a state diagram of step five in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0030] Figure 6 This is a state diagram of step five in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0031] Figure 7 This is a state diagram of step five in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0032] Figure 7a yes Figure 7 Enlarged view of part A in the middle;

[0033] Figure 8 This is a state diagram of step six in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0034] Figure 9 This is a state diagram of step seven in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0035] Figure 9a yes Figure 9 Enlarged view of part B in the middle;

[0036] Figure 10 This is a state diagram of step eight in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0037] Figure 10a yes Figure 10 Enlarged view of section C;

[0038] Figure 11 This is a state diagram of step nine in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0039] Figure 11a yes Figure 11 Enlarged view of part D in the middle;

[0040] Figure 12 This is a state diagram of step ten in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0041] Figure 13This is a state diagram of step eleven in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0042] Figure 14 This is a schematic diagram of the pull-out tool used in step thirteen of the offshore wind power steel pipe pile dismantling method of the present invention;

[0043] Figure 15 This is a state diagram of step thirteen in the method for dismantling offshore wind power steel pipe piles of the present invention;

[0044] Figure 16 This is a state diagram of step fourteen in the method for dismantling offshore wind power steel pipe piles of the present invention. Detailed Implementation

[0045] The invention will now be further described with reference to the accompanying drawings.

[0046] Please see Figures 1 to 16 The method for dismantling offshore wind turbine steel pipe piles of the present invention includes the following steps:

[0047] Step 1: Crane vessel 20 approaches and anchors; transport barge 30 approaches and is moored to the starboard side of crane vessel 20; dredger 40 approaches and anchors; pile cutting device 50 is placed on the deck of crane vessel 20 (see...). Figure 2 );

[0048] Step two: Workers enter the inner platform inside the steel pipe pile 10 via a hoist cage. Two temporary lifting lugs 60 are then symmetrically installed on the top flange 11 of the steel pipe pile 10 (see...). Figure 3 );

[0049] Step 3: Workers stand on the inner platform ring plate 12 at the outer edge of the inner platform plate 13 to remove the inner platform plate 13. After removal, the inner platform plate 13 is lifted onto the deck of the transport barge 30 by the crane vessel 20 (see...). Figure 4 );

[0050] Step 4: Use the dredging vessel 40 to dredge the steel pipe pile 10 to remove the sludge inside the steel pipe pile 10, so as to ensure that the pile cutting device 50 can be lowered to the designated elevation.

[0051] Step 5: First, install two connecting fixtures 70 symmetrically on the central flange 11 of the pile top. These two connecting fixtures 70 and the two temporary lifting lugs 60 are offset at 90° (see...). Figure 5 The auxiliary hook of the crane vessel 20 is connected to four lifting lugs fixed to the top surface of the pile cutting device 50 via a lifting wire rope. The pile cutting device 50 is then lifted to the top of the steel pipe pile 10 (see...). Figure 6Then, the pile cutting device 50 is lowered to the inner platform ring plate 12 of the steel pipe pile 10. Next, the winch wire ropes 51 on the two winches installed on the top surface of the pile cutting device 50 are connected one-to-one with the two connecting fixtures 70 using shackles. By tightening the two winch wire ropes 51 one-to-one with the two winches, the auxiliary hook of the crane vessel 20 can be unhooked (see...). Figure 7 and Figure 7a );

[0052] Step Six: The main hook of the crane vessel 20 is hooked to two temporary lifting lugs 60 fixed on the pile top flange 11 via a lifting wire rope, preparing for the lifting operation after the steel pipe pile 10 is cut (see...). Figure 8 );

[0053] Step 7: By remotely controlling the two winches 52 on the pile cutting device 50, the pile cutting device 50 is lowered to the designated elevation below the mud surface. Then, by remotely controlling the piston rods of the four stabilizing support cylinders 53 on the pile cutting device 50, the piston rod ends of the four stabilizing support cylinders 53 are extended, causing the rollers at their ends to firmly press against the inner wall of the steel pipe pile 10 (see...). Figure 9 and Figure 9a This provides support for the pile cutting device 50, ensuring the safety and stability of subsequent pile cutting operations;

[0054] Step 8: By remotely controlling the four radially evenly distributed pile-cutting cylinders 54 mounted on the rotary cutting platform 57 of the pile-cutting device 50, the four plasma cutting torches 55, which are correspondingly mounted on the piston rods of the four pile-cutting cylinders 54, are brought into contact with the inner wall of the steel pipe pile 10. Then, the four plasma cutting torches 55 are started remotely to perform pile-cutting operations. After the initial point is cut through, the servo motor 56 that drives the rotary cutting platform 57 is remotely controlled to rotate, causing the rotary cutting platform 57 to rotate around its axis, thereby driving the four plasma cutting torches 55 to achieve a complete circumferential cutting motion (see...). Figure 10 and Figure 10a );

[0055] Step nine: After the steel pipe pile is cut, the piston rods of the four pile cutting cylinders 54 and the four stabilizing support cylinders 53 are retracted in sequence. Then, by remotely controlling the two winches 52, the pile cutting device 50 is raised to the top of the cut steel pipe pile 10' and placed at the same level as the inner platform ring plate 12. By remotely controlling the piston rods of the four stabilizing support cylinders 53, the piston rods of the four stabilizing support cylinders 53 are extended, and the entire pile cutting device 50 is securely supported on the pile wall of the cut steel pipe pile 10' (see...). Figure 11 and Figure 11a );

[0056] Step 10: After the pile cutting device 50 is raised to the top of the pile and firmly supported on the pile wall of the cut steel pipe pile 10', the main hook of the crane vessel 20 can then lift the cut steel pipe pile 10' (see...). Figure 12 );

[0057] Step 11: When the bottom of the cut steel pipe pile 10' is 1m above the deck of the crane vessel 20, the tail of the cut steel pipe pile 10' is slid off using the turning clamp 80 on the auxiliary hook of the crane vessel 20. By controlling the main hook and auxiliary hook of the crane vessel 20, the cut steel pipe pile 10' is changed from a vertical state to a horizontal state (see...). Figure 13 );

[0058] Step 12: Lower the horizontally cut steel pipe pile 10' onto the deck of the transport barge 30, and unhook the main hook and auxiliary hook of the crane vessel 20.

[0059] Step 13: The pile cutting device is pulled out from the inside of the cut steel pipe pile 10' using a pull-out fixture 90. The pull-out fixture 90 has a crank structure and includes a flange joint 91, a lower vertical section 92, an inclined section 93, an upper vertical section 94, and a transverse section 95 connected sequentially from bottom to top. The flange joint 91 includes two parallel flange plates 911 and a support pipe 912 connecting the two flange plates 911. The lower end of the lower vertical section 91 is connected to the outer surface of the support pipe 912 of the flange joint 91. The transverse length of the inclined section 93 is greater than the straight-line distance between the top of the pile cutting device 50 and the top of the cut steel pipe pile 10'. The sum of the lengths of the lower vertical section 92, the vertical length of the inclined section 93, and the upper vertical section 94 is greater than the outer radius of the steel pipe pile 10. A lifting lug 96 is provided on the top surface of the transverse section 95 (see...). Figure 14 The flange joint 91, lower vertical section 92, and inclined section 93 of the pull-out fixture 90 are extended from the top of the pile into the interior of the cut steel pipe pile 10'. A flange plate 911 on the flange joint 91 is connected to the device flange 58 fixed at the top center of the pile cutting device 50, so that the transverse section 95 of the pull-out fixture 90 is located outside the cut steel pipe pile 10' and parallel to the outer wall of the cut steel pipe pile 10'. The fixture lifting lug 96 on the transverse section 95 is aligned with the center of gravity of the assembly of the pull-out fixture 90 and the pile cutting device 50 on the same vertical line (see...). Figure 15 Then, connect the crane hook to the tooling lug 96, and remotely control the piston rods of the four stabilizing support cylinders 53 on the pile cutting device 50 to retract. At the same time, control the crane to pull the pile cutting device 50 out of the cut steel pipe pile 10'.

[0060] Step Fourteen: After the crane vessel 20 and transport barge 30 complete their work, they will be withdrawn from the designated location. The dredging vessel 40 can be withdrawn ahead of schedule after completing its dredging work (see...). Figure 16 ).

[0061] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of the invention and should be defined by the claims.

Claims

1. A method for dismantling offshore wind turbine steel pipe piles, characterized in that, The demolition method includes the following steps: Step 1: The crane ship enters the dock and anchors, the transport barge is moored to the starboard side of the crane ship, the dredger enters the dock and anchors, and the pile cutting device is placed on the deck of the crane ship. Step two: The workers enter the inner platform inside the steel pipe pile through the hoist cage, and install two temporary lifting lugs symmetrically on the top flange of the steel pipe pile. Step 3: The workers stand on the inner platform ring plate on the outer edge of the inner platform plate to remove the inner platform plate. After removal, the inner platform plate is lifted onto the deck of the transport barge by a crane ship. Step four: Use a dredging vessel to suction mud from inside the steel pipe piles; Step 5: First, install two connecting fixtures symmetrically on the top flange of the pile. The auxiliary hook of the crane ship is connected to four lifting lugs fixed on the top surface of the pile cutting device through the lifting wire rope. Then, lift the pile cutting device to the top of the steel pipe pile and lower it to the inner platform ring plate of the steel pipe pile. Then, connect the winch wire ropes on the two winches installed on the top surface of the pile cutting device to the two connecting fixtures one by one through shackles. By remotely controlling the two winches to tighten the two winch wire ropes one by one, the auxiliary hook of the crane ship can be unhooked. Step 6: The main hook of the crane vessel is hooked to two temporary lifting lugs fixed on the flange at the top of the pile via the lifting wire rope. Step 7: By remotely controlling the two winches on the pile cutting device, the pile cutting device is lowered to the specified elevation below the mud surface. By remotely controlling the piston rods of the four stabilizing support cylinders on the pile cutting device to extend, the rollers at the ends of the piston rods of the four stabilizing support cylinders are firmly pressed against the inner wall of the steel pipe pile. Step 8: By remotely controlling the four radially evenly distributed pile-cutting cylinders on the rotary cutting platform of the pile-cutting device, the four plasma cutting torches, which are installed one-to-one on the piston rods of the four pile-cutting cylinders, are brought into contact with the inner wall of the steel pipe pile. Then, the four plasma cutting torches are started remotely to carry out the pile-cutting operation. After the initial point is cut through, the servo motor that drives the rotary cutting platform is remotely controlled to rotate the rotary cutting platform around the axis, thereby driving the four plasma cutting torches to achieve a complete circumferential cutting motion. Step 9: After the steel pipe pile is cut, the piston rods of the four pile cutting cylinders and the four stabilizing support cylinders are retracted one after another. Then, by remotely controlling the two winches, the pile cutting device is raised to the top of the cut steel pipe pile and is at the same level as the inner platform ring plate. By remotely controlling the piston rods of the four stabilizing support cylinders, the entire pile cutting device is firmly supported on the pile wall of the cut steel pipe pile. Step 10: After the pile cutting device is lifted to the top of the cut steel pipe pile and firmly supported on the pile wall, the main hook of the crane can lift the cut steel pipe pile. Step 11: When the bottom of the cut steel pipe pile is 1m above the deck of the crane ship, the cut steel pipe pile is tailed by the turning clamp on the auxiliary hook of the crane ship. By controlling the main hook and auxiliary hook of the crane ship, the cut steel pipe pile is changed from a vertical state to a horizontal state. Step 12: Lower the horizontally cut steel pipe piles onto the deck of the transport barge, and then detach the main hook and auxiliary hook of the crane ship. Step 13: The pile cutting device is pulled out from the inside of the cut steel pipe pile using a pull-out fixture; the pull-out fixture has a crank structure and includes a flange joint, a lower vertical section, an inclined section, an upper vertical section, and a transverse section connected sequentially from bottom to top; wherein, the flange joint includes two parallel flange plates and a support pipe connecting the two flange plates; the lower end of the lower vertical section is connected to the outer surface of the support pipe of the flange joint; the transverse length of the inclined section is greater than the straight-line distance between the top of the pile cutting device and the top of the steel pipe pile; the sum of the length of the lower vertical section, the vertical length of the inclined section, and the length of the upper vertical section is greater than the outer radius of the steel pipe pile; A tooling lifting lug is provided on the top surface of the transverse section; the flange joint of the pull-out tooling, the lower vertical section and the inclined section are extended from the top of the pile into the interior of the cut steel pipe pile, and a flange plate on the flange joint is connected to the device flange fixed in the center of the top of the pile cutting device, so that the transverse section of the pull-out tooling is located outside the cut steel pipe pile and parallel to the outer wall of the cut steel pipe pile, and the tooling lifting lug on the transverse section is located on the same vertical line as the center of gravity of the combination of the pull-out tooling and the pile cutting device. Then the crane hook is connected to the tooling lifting lug, and the piston rods of the four stabilizing support cylinders are retracted by remote control. At the same time, the pile cutting device is pulled out from the cut steel pipe pile by controlling the crane. Step fourteen: After the crane vessel and transport barge complete their work, they will be removed from the site. The dredging vessel can be removed from the site ahead of schedule after completing its dredging work.

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