CN212560438U

CN212560438U - Tensioning type sacrificial anode system for offshore wind power cathodic protection

Info

Publication number: CN212560438U
Application number: CN202021868470.7U
Authority: CN
Inventors: 秦铁男; 宋世德; 刘磊; 张馨予
Original assignee: Dalian Kingmile Anticorrosion Technology Co ltd
Current assignee: Dalian Komeier Marine Technology Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-02-19
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses a tensioning formula sacrificial anode system for offshore wind power cathodic protection, including the wind-powered electricity generation pile foundation, be equipped with the operation platform on the wind-powered electricity generation pile foundation, still include wire rope and at least one sacrificial anode subassembly, be equipped with on the operation platform and can the tensioning wire rope's overspeed device tensioner, wire rope's one end with overspeed device tensioner connects, wire rope's the other end is fixed in on the wind-powered electricity generation pile foundation, sacrificial anode subassembly includes sacrificial anode, connecting piece and fixed sleeve, the outside of connecting piece is equipped with sacrificial anode, the both ends of connecting piece respectively with a fixed sleeve fixed connection, fixed sleeve cover is located on the wire rope, and with wire rope fixed connection. The utility model provides a tensioning formula sacrificial anode system can shorten on-the-spot installation period greatly, reduce wind-powered electricity generation pile foundation structure self weight, reduces pile foundation prefabrication welding work load, improves the cathodic protection effect on basis under water.

Description

Tensioning type sacrificial anode system for offshore wind power cathodic protection

Technical Field

The utility model belongs to the technical field of cathodic protection is anticorrosive, concretely relates to tensioning formula sacrificial anode system for offshore wind power cathodic protection.

Background

Offshore wind power is used as clean energy mainly developed by the countries in recent years, the single machine installed capacity is large, the number of hours is effectively utilized, land resources are not occupied, and the offshore wind power generation system is close to the national coastal power load center and has wide application prospect. The underwater foundation of offshore wind power has various structural forms such as single pile type, pile group type, floating type, negative pressure barrel type, conduit bracket type and the like, and is usually protected by adopting a cathode protection and an anticorrosive coating in a combined way because the underwater foundation is in a harsh marine corrosion environment of open sea for a long time.

The cathodic protection technology is divided into sacrificial anodic protection technology and impressed current protection technology, wherein the sacrificial anodic protection is to connect protected metal with another metal or alloy with lower electrode potential, so that the metal or alloy is preferentially consumed as an anode, and the protected metal is protected by obtaining cathodic current; impressed current cathodic protection systems are generally constructed of three parts, a direct current, an auxiliary anode and a reference electrode, and provide an additional cathodic current to the protected metal structure from an external direct current source and auxiliary anode, thereby inhibiting corrosion of the protected metal. The sacrificial anode cathodic protection has the advantages of simple installation process, no need of external power supply, no need of operation and maintenance management and the like, and is widely applied to the field of cathodic protection of offshore wind power underwater foundation. Because the offshore wind power underwater foundation needs to be piled in place, the sacrificial anode cannot be welded on the outer wall of the underwater foundation in advance. Usually, a sacrificial anode installation structural member is prefabricated and welded on the outer wall of a foundation in advance before an underwater foundation pile sinking, and the sacrificial anode is installed in place through diving operation, but the method needs a large amount of diving construction operation, and is low in efficiency and high in risk.

In patent CN205501971U, the sacrificial anode is prefabricated and welded on an integrated accessory type component in advance, and then integrally hoisted and installed on the underwater foundation of the wind power. Patent CN202576571U an offshore wind power single tubular pile sacrificial anode device improves sacrificial anode and mounting structure's bulk strength through optimal design, can install on the pile foundation outer wall before pile sinking, but this mode is only applicable to coastal waters intertidal zone wind-powered electricity generation single tubular pile basis, is not applicable to off-shore deep water offshore wind power basis under water. Patent CN203096180U tensile formula sacrificial anode cluster and patent CN209292486U a suspension type sacrificial anode structure for offshore wind turbine single pile basis inner wall directly becomes an organic whole with a plurality of sacrificial anode monomers and steel cable casting, and the casting temperature is up to 600 ~ 750 ℃, can lead to the steel cable to be annealed under uncertain cooling rate, has changed the metallographic structure of steel wire, has reduced the breaking force of steel cable. The tensile sacrificial anode structure disclosed in patent CN203096180U is installed by suspension type stretching, and no tension is applied to the whole sacrificial anode string during the stretching process, so that it cannot resist the external force action of ocean current and wind wave for a long time.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the proposition of above problem, and the tensioning formula sacrificial anode system for offshore wind power cathodic protection of study design solves in the marine wind power field of tradition, sacrificial anode installation effectiveness low, basic protection effect shortcoming such as poor under water. The utility model discloses a technical means as follows:

the utility model provides an offshore wind power is tensioning formula sacrificial anode system for cathodic protection, includes the wind-powered electricity generation pile foundation, be equipped with the work platform on the wind-powered electricity generation pile foundation, still include wire rope and at least one sacrificial anode subassembly, be equipped with on the work platform and can the tensioning wire rope's overspeed device tensioner, wire rope's one end with overspeed device tensioner connects, wire rope's the other end is fixed in on the wind-powered electricity generation pile foundation, the sacrificial anode subassembly includes sacrificial anode, connecting piece and fixed sleeve, the outside of connecting piece is equipped with sacrificial anode, the both ends of connecting piece respectively with a fixed sleeve fixed connection, fixed sleeve cover is located on the wire rope, and with wire rope fixed connection.

Preferably, overspeed device tensioner includes turn-buckle, crossbeam, pillar and mounting, the pillar is fixed in on the work platform, the crossbeam is fixed in on the pillar, be equipped with the mounting on the crossbeam, the one end of turn-buckle with the mounting is connected, the other end with wire rope connects.

Preferably, the connecting piece is detachably connected with the fixed sleeve, and the fixed sleeve is connected with the steel wire rope in a cold pressing mode.

Preferably, the sacrificial anode assembly further comprises a first flange and a second flange, two ends of the connecting piece are respectively and fixedly connected with the first flange, the first flange is connected with the second flange, and the second flange is sleeved with the fixing sleeve.

Preferably, the connecting piece is of a hollow tubular structure, the steel wire rope penetrates through the connecting piece, the second flange is a flange with a neck, the neck of the second flange extends into the first flange, an internal thread is arranged in the second flange, and an external thread which is connected with the second flange in a matched mode is arranged on the outer side of the fixing sleeve.

Preferably, the steel wire ropes are of a multi-section structure, and the end parts of the adjacent steel wire ropes are fixedly connected with the fixing sleeves at the two ends of the connecting piece respectively;

the flange structure is characterized in that an annular stop block is arranged in the second flange, the periphery of the stop block is in sealing connection with the inner wall of the second flange, a fixing hole is formed in the stop block, one end of the fixing sleeve is provided with a fixing strip matched with the fixing hole, threads are arranged outside the fixing strip, and when the second flange is connected with the fixing sleeve in a sleeved mode, the fixing strip can penetrate through the fixing hole and is fixedly connected with the fixing hole through the threads and the nut.

Preferably, at least one shear resistant member is provided between the connector and the sacrificial anode, the shear resistant member being connected to the connector.

Preferably, the anti-shearing piece is of an annular structure, and the anti-shearing piece is welded with the connecting piece or connected with the connecting piece through a hoop.

Preferably, the shear resistant member is a pin.

Preferably, a lifting lug is arranged on the wind power pile foundation, one end of the steel wire rope is connected with the lifting lug, the other end of the steel wire rope is connected with the tensioning device, the connecting piece is a low-alloy seamless steel pipe, two ends of the connecting piece are welded with the first flange, the first flange is connected with the second flange through bolts, the steel wire rope is a sealed steel wire rope, lubricating grease is arranged between strands of steel wires of the steel wire rope, a sheath is arranged outside the steel wire rope, the sheath is made of polyurethane or polyolefin, and the sacrificial anode is an aluminum-based sacrificial anode of aluminum-based, zinc-based, magnesium-based or outer-layer composite magnesium-based alloy.

Compared with the prior art, the utility model relates to an offshore wind power is tensioning formula sacrificial anode system for cathodic protection's beneficial effect does: the utility model provides a tensioning formula sacrificial anode system can shorten on-the-spot installation period greatly, reduce wind-powered electricity generation pile foundation structure self weight, reduce pile foundation prefabrication welding work load, improve the cathodic protection effect on basis under water, be applicable to the multiple foundation structure form under water of marine wind-powered electricity generation such as single pile formula basis, tripod formula basis, gravity type structure, be applicable to other maritime workers 'structures cathodic protection on basis under water equally, especially at the construction stage that can't provide stable power supply. Meanwhile, the spacing distance of the sacrificial anode can be adjusted according to the protection requirement of the pile foundation structure, so that the underwater foundation can obtain uniform protection potential distribution in the whole life cycle, and the method is particularly suitable for cathodic protection of the deep underwater foundation in the open sea.

Drawings

Fig. 1 is a schematic view of an overall installation structure in embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a tensioning device in embodiment 1 of the present invention.

Fig. 3 is a schematic view of an installation structure of a steel wire rope in embodiment 1 of the present invention.

Fig. 4 is a schematic structural view of a plurality of sacrificial anode assemblies connected in series according to embodiment 1 of the present invention.

Fig. 5 is a schematic sectional view of the sacrificial anode body and the anode steel pipe core in embodiment 1 of the present invention.

Fig. 6 is a side view schematic of the structure of fig. 5.

Fig. 7 is an overall sectional structural view of a sacrificial anode assembly in example 1 of the present invention.

Fig. 8 is a side view schematic of the structure of fig. 7.

Fig. 9 is an enlarged schematic view of a portion a of fig. 7.

Fig. 10 is a schematic structural view of a plurality of sacrificial anode assemblies connected in series according to example 2 of the present invention.

Fig. 11 is an overall sectional structural view of a sacrificial anode assembly in example 2 of the present invention.

Fig. 12 is a schematic side view of a second flange and a steel wire rope according to embodiment 2 of the present invention.

Fig. 13 is an enlarged schematic view of a portion B in fig. 11.

In the figure, 1, a wind power pile foundation; 2. a sacrificial anode assembly; 3. a wire rope; 4. a tensioning device; 5. a bolt; 11. an operation platform; 12. lifting lugs; 13. a through hole; 21. a sacrificial anode; 22. a connecting member; 23. a first flange; 24. a second flange; 25. fixing the sleeve; 26. a shear resistant member; 27. a sheath; 28. a stopper; 29. a fixing hole; 30. a fixing strip; 31. a rope section; 41. a wire grip; 42. a cross beam; 43. a pillar; 44. and a fixing member.

Detailed Description

Example 1:

as shown in fig. 1-9, a tensioning type sacrificial anode system for offshore wind power cathodic protection comprises a wind power pile foundation 1, an operation platform 11 arranged on the wind power pile foundation 1, a steel wire rope 3 and a plurality of sacrificial anode assemblies 2 sleeved on the steel wire rope 3. The working platform 11 is provided with a tensioning device 4 capable of tensioning the steel wire rope 3, the tensioning device 4 comprises a wire tightener 41, a cross beam 42, a support column 43 and a fixing piece 44, the support column 43 is fixed on the working platform 11, the cross beam 42 is fixed on the support column 43, and the cross beam 42 and the support column 43 are matched to form a tensioning door frame. The cross beam 42 is provided with a fixing member 44, the fixing member 44 can be designed into a hook-shaped or ring-shaped structure, one end of the wire grip 41 is connected with the fixing member 44, and the other end is connected with the steel wire rope 3. The through hole 13 for the steel wire rope 3 to pass through is arranged on the operation platform 11, the tension of the steel wire rope 3 can be adjusted through the wire tightener 41, the steel wire rope 3 is ensured to be in a tension state, and the capability of resisting ocean current and wind wave of the steel wire rope 3 is improved.

Lifting lugs 12 are arranged at one end, close to the bottom, of the wind power pile foundation 1, rope joints 31 are arranged at the end portions of the steel wire ropes 3, and one ends of the steel wire ropes 3 are fixedly connected with the lifting lugs 12 through the rope joints 31 and bolts 5 to form lower anchoring points of the steel wire ropes 3. It should be noted that, the lower anchor point of 3 stretch-draw of wire rope can utilize the lug 12 of pile foundation self, also can prefabricate the welding anchor point on the pile foundation body, with wire rope 3 welding on wind-powered electricity generation pile foundation 1. The other end of the steel wire rope 3 is connected with the tightener 41 through structures such as a cable joint 31 and a shackle, and is fixed on the wind power pile foundation 1 to form an upper anchoring point of the steel wire rope 3. Two ends of the steel wire rope 3 are fixed on the wind power pile foundation 1 through upper and lower anchoring points respectively, and then are tensioned through the wire tightener 41, so that the installation and fixation of the steel wire rope 3 can be completed.

The mechanical tensioning between the rope knot 31 at the tail end of the steel wire rope 3 and the shackle and the lower anchoring point can realize the electric connection with the wind power pile foundation 1, namely, the natural electric connection of stress friction of the shackle is utilized, or the structural form is designed, so that the manual/rov screwing is realized to realize the reliable electric connection of the compression/needling and the like. The upper anchoring point stretched by the steel wire rope 3 can utilize the self electric connection of a stress structure (a cable section and other structures), and a steel wire rope branch (realized by a deconcentrator) can be added for being electrically connected with the wind power pile foundation 1.

The sacrificial anode assembly 2 comprises a sacrificial anode 21, a connector 22, a first flange 23, a second flange 24 and a fixing sleeve 25. The connecting piece 22 is of a hollow tubular structure, the steel wire rope 3 penetrates through the whole connecting piece 22, the sacrificial anode 21 is arranged outside the connecting piece 22, two ends of the connecting piece 22 are respectively welded with a first flange 23, and the first flange 23 is connected with a second flange 24 through bolts 5. The second flange 24 is a neck flange, the neck of which extends into the first flange 23 and is attached to the inner wall of the first flange 23, and an internal thread is arranged in the second flange 24. Outside wire rope 3 was located to the fixed sleeve 25 cover, fixed sleeve 25 was the dysmorphism structure of colding pressing, and the outside of fixed sleeve 25 one end is equipped with the external screw thread with second flange 24 complex, passes through threaded connection between fixed sleeve 25 and the second flange 24. The other end of the fixed sleeve 25 is attached to the outer side of the steel wire rope 3, and the attached end of the fixed sleeve 25 is hydraulically connected (specifically cold-pressed) with the steel wire rope 3 through a hydraulic die. The fixing sleeve 25 can be made of high-quality carbon structural steel, low-alloy structural steel and the like, the tensile breaking force of the compression joint is not lower than the breaking force of the steel wire rope 3, the fixing sleeve 25 is guaranteed to be stably connected with the steel wire rope 3, and meanwhile the structure of the steel wire rope 3 cannot be damaged.

The sacrificial anode 21 and the steel wire rope 3 are mechanically connected in series by using the first flange 23, the second flange 24, the fixing sleeve 25 and other structures, so that the problem of reduction of mechanical properties of the steel wire rope 3 in the casting process of the sacrificial anode 21 is solved, and the mechanical properties of the steel wire rope 3 are ensured while the structure of the sacrificial anode 21 is formed. When the sacrificial anode 21 structure is applied, the length required by the steel wire rope 3 is determined firstly, and because each structural unit can be detached, replaced and reconstructed, the mounting position of each structure can be specifically adjusted according to the service condition of the steel wire rope 3, and particularly the density degree of the sacrificial anode assembly 2 on the steel wire rope 3 can be controlled, so that the overall mounting of the sacrificial anode structure can be completed before mounting, and the production of the sacrificial anode is facilitated.

In order to prevent the sacrificial anode assembly 2 from colliding with the pile foundation body under the action of wind waves and water flows, rubber anti-collision rings are additionally arranged at two ends of a key anode with higher collision probability, the anti-collision rings are chloroprene rubber open circular rings, and the two ends of the anode, which are closest to the pile foundation and are in the middle area with the largest deflection of the steel wire rope 3, are selected as mounting positions, namely are mounted on the connecting piece 22 between the sacrificial anode 21 and the flange.

The connecting piece 22 is a seamless steel pipe with a low alloy structure, and has the advantages of light weight, good corrosion resistance, wide source and low cost. The outer side of the connecting piece 22 is provided with three anti-shearing pieces 26 which are uniformly arranged and made of the same material along the circumferential direction, so as to ensure the stability of the installation of the sacrificial anode 21, the number of the anti-shearing pieces 26 is not limited to three, and the number is determined according to the specific application working condition. The anti-shearing element 26 may be a ring structure, which is welded to the connecting element 22 or fixed by a hoop connection, and the connection is convenient and stable. The anti-shear element 26 may also be a pin welded to the connecting element 22, which allows for better electrical connection (multi-point electrical connection), while eliminating thermal expansion and cold contraction effects, without interface compatibility issues, and with better overall synergy of the sacrificial anode 21 and more stable installation.

The steel wire rope 3 is a totally-enclosed steel wire rope for ocean engineering, and lubricating grease with lubricating, water-blocking and anti-corrosion functions is filled among strands of steel wires of the steel wire rope 3. The steel wire rope 3 is externally provided with a sheath 27, a water-resistant layer is arranged between the steel wire rope 3 and the polymer sheath 27, and the sheath 27 is made of polyurethane or polyolefin and can prevent the steel wire rope 3 from being corroded. The sacrificial anode 21 is an aluminum-based sacrificial anode of aluminum-based, zinc-based or outer-layer composite magnesium-based alloy.

To practical engineering application, the utility model provides an among the marine wind power is tensioning formula sacrificial anode system for cathodic protection, each structure and part specification need be confirmed according to the calculation, and concrete step is as follows: calculating and determining the size and the number of the sacrificial anodes according to the protected structure area, the coating condition, the service working condition, the design protection age and the like; calculating and determining the arrangement position of the sacrificial anode 21 by using cathode protection numerical simulation software; according to the specification, the number, the position and the service working condition of the sacrificial anode 21, performing mechanical calculation to determine the specification of the first flange 23, the steel wire rope 3, the second flange 24 and other structures; the tensioners and tensioning gantries (beams 42 and struts 43) are selected according to the self-weight of each set of sacrificial anodes 21 and the required tensioning force.

The utility model discloses a tensioning formula mounting means be different from ordinary tensile formula installation, and the tensioning force is according to self load, operating mode and wire rope bearing capacity comprehensive calculation. After the composite steel wire rope of the sacrificial anode is tensioned through the prefabricated tensioning force, the integral rigidity of the composite steel wire rope is improved, the alternating stress load under the action of seawater tide and the external force damage under the extreme ocean working condition can be effectively resisted, and the sacrificial anode can be prevented from colliding with a wind power pile foundation under the action of ocean current.

The mounting principle of the sacrificial anode structure in this embodiment is as follows: prefabricating a sacrificial anode structure on the steel wire rope 3 according to actual working conditions, namely fixing a fixing sleeve 25 on the steel wire rope 3, connecting and fixing a second flange 24 and the fixing sleeve 25 through threads, penetrating the steel wire rope 3 through a connecting piece 22, fixing a first flange 23 and a second flange 24 at the end part of the connecting piece 22 through a bolt 5, and arranging a sacrificial anode 21 on the connecting piece 22 in a surrounding mode. If parts need to be maintained and replaced in the application process, the first flange 23 and the second flange 24 can be directly disassembled, and then specific parts are replaced, so that the operation is convenient. Two ends of the steel wire rope 3 are fixed on the wind power pile foundation 1 through upper and lower anchoring points respectively, and then the steel wire rope 3 is integrally tensioned through adjusting the tightener 41, so that the fixation of the integral sacrificial anode system is completed.

Offshore wind power is the basis under water and is mostly the individual structures of distributed arrangement, the utility model discloses sacrificial anode cathodic protection system to the one set of tensioning formula installation of offshore wind power single pile foundation development under water, the construction is simple, the installation rate is fast, does not need prefabricated a large amount of structures of welding on the pile foundation body, and system later maintenance and change are simple. The lower anchoring point stretched by the sacrificial anode can utilize a lifting lug of a pile foundation, and a welding anchor point can be prefabricated on the pile foundation body without designing an additional gravity base. The upper anchoring point stretched by the sacrificial anode is arranged on the offshore wind power working platform, and the tensioning force of the steel wire rope composite cable can be adjusted through the designed tensioning device, so that the deflection deformation of the steel wire rope composite cable under the action of wind and wave current is limited. After the composite steel wire rope of the sacrificial anode is tensioned through the prefabricated tensioning force, the integral rigidity of the composite steel wire rope is improved, the alternating stress load under the action of seawater tide and the external force damage under the extreme ocean working condition can be effectively resisted, and the sacrificial anode can be prevented from colliding with a pile foundation body under the action of ocean current. The method is suitable for various underwater foundation structure forms of offshore wind power such as single-pile foundations, tripod foundations, gravity structures and the like, is also suitable for cathode protection of underwater foundations of other marine structures, and is particularly suitable for construction stages incapable of providing stable power supplies. Meanwhile, the spacing distance of the sacrificial anode can be adjusted according to the protection requirement of the pile foundation structure, so that the underwater foundation can obtain uniform protection potential distribution in the whole life cycle, and the method is particularly suitable for cathodic protection of the deep underwater foundation in the open sea.

Example 2:

as shown in fig. 10 to 13, the difference from embodiment 1 is that the steel wire ropes 3 are multi-segment type structures, and adjacent steel wire ropes 3 are connected by the sacrificial anode assembly 2. Specifically, both ends of each section of steel wire rope 3 are all connected with fixed sleeve 25, the inside of fixed sleeve 25 be with steel wire rope 3 complex hollow structure, the one end of fixed sleeve 25 is for being used for cup jointing steel wire rope 3's opening, the other end is enclosed construction, is connected fixedly through hydraulic pressure between fixed sleeve 25 and the steel wire rope 3. An annular stop block 28 is arranged in the second flange 24, the periphery of the stop block 28 is connected with the inner wall of the second flange 24 in a sealing mode, and a fixing hole 29 is formed in the stop block 28. The closed end of the fixed sleeve 25 is provided with a fixed strip 30 matched with the fixed hole 29, and when the second flange 24 is sleeved with the fixed sleeve 25, the fixed strip 30 passes through the fixed hole 29 and extends into the connecting piece 22. The fixing strip 30 is provided with an external thread, and one end of the fixing strip 30 extending into the connecting piece 22 can be matched with the nut, so that the fixing strip 30 and the fixing hole 29 are fixedly connected, and the fixing between the second flange 24 and the fixing sleeve 25 can be realized. The second flange 24 is a neck flange, the neck of the second flange extends into the connecting piece 22, after the fixing strip 30 passes through the fixing hole 29 and is fixed by a nut, the neck of the second flange 24 is filled with filler, such as epoxy resin, so that good sealing performance between the fixing strip 30 and the fixing hole 29 is ensured.

The mounting principle of the sacrificial anode structure in this embodiment is as follows: the length of each section of the steel wire rope 3 is determined according to the position where the sacrificial anode 21 needs to be installed, the fixing sleeve 25 is fixed at the end of the steel wire rope 3 in a hydraulic mode, the fixing sleeve 25 is fixed in the second flange 24 through the fixing strip 30, the second flange 24 and the first flange 23 are fixed through the bolts 5, the first flange 23 is welded with the connecting piece 22, and the sacrificial anode 21 is arranged on the connecting piece 22 in a surrounding mode. When a certain part in the structure of the sacrificial anode 21 is damaged or needs to be replaced, the first flange 23 and the second flange 24 can be detached firstly, and part of the sacrificial anode assembly 2 can be maintained or replaced independently, so that underwater operation is facilitated. Two ends of the steel wire rope 3 are fixed on the wind power pile foundation 1 through upper and lower anchoring points respectively, and then the steel wire rope 3 is integrally tensioned through adjusting the tightener 41, so that the fixation of the integral sacrificial anode system is completed.

The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.

Claims

1. The utility model provides an offshore wind power is tensioning formula sacrificial anode system for cathodic protection, includes wind power pile foundation (1), be equipped with operation platform (11) on wind power pile foundation (1), its characterized in that: still include wire rope (3) and at least one sacrificial anode subassembly (2), be equipped with on operation platform (11) and can the tensioning overspeed device tensioner (4) of wire rope (3), the one end of wire rope (3) with overspeed device tensioner (4) are connected, the other end of wire rope (3) is fixed in on wind-powered electricity generation pile foundation (1), sacrificial anode subassembly (2) are including sacrificial anode (21), connecting piece (22) and fixed sleeve (25), the outside of connecting piece (22) is equipped with sacrificial anode (21), the both ends of connecting piece (22) respectively with a fixed sleeve (25) fixed connection, fixed sleeve (25) cover is located on wire rope (3), and with wire rope (3) fixed connection.

2. The tensioned sacrificial anode system for offshore wind power cathodic protection according to claim 1, characterized in that: overspeed device tensioner (4) are including turn-buckle (41), crossbeam (42), pillar (43) and mounting (44), pillar (43) are fixed in on operation platform (11), crossbeam (42) are fixed in on pillar (43), be equipped with mounting (44) on crossbeam (42), the one end of turn-buckle (41) with mounting (44) are connected, the other end with wire rope (3) are connected.

3. The tensioned sacrificial anode system for offshore wind power cathodic protection according to claim 1 or 2, characterized in that: the connecting piece (22) is detachably connected with the fixed sleeve (25), and the fixed sleeve (25) is connected with the steel wire rope (3) in a cold pressing mode.

4. The tensioned sacrificial anode system for offshore wind power cathodic protection according to claim 3, characterized in that: the sacrificial anode assembly (2) further comprises a first flange (23) and a second flange (24), two ends of the connecting piece (22) are fixedly connected with the first flange (23) respectively, the first flange (23) is connected with the second flange (24), and the second flange (24) is sleeved with the fixing sleeve (25).

5. The tensioned sacrificial anode system for offshore wind power cathodic protection according to claim 4, characterized in that: connecting piece (22) are hollow tubular structure, wire rope (3) run through connecting piece (22), second flange (24) are the flange of taking the neck, and its neck stretches into in first flange (23), be equipped with the internal thread in second flange (24), the outside of fixed sleeve (25) be equipped with the external screw thread that second flange (24) cooperation is connected.

6. The tensioned sacrificial anode system for offshore wind power cathodic protection according to claim 4, characterized in that: the steel wire ropes (3) are of a multi-section structure, and the end parts of the adjacent steel wire ropes (3) are fixedly connected with the fixed sleeves (25) at the two ends of the connecting piece (22) respectively;

be equipped with annular dog (28) in second flange (24), dog (28) all around with the inner wall sealing connection of second flange (24), be equipped with fixed orifices (29) on dog (28), the one end of fixed sleeve (25) be equipped with fixed orifices (29) complex fixed strip (30), fixed strip (30) are equipped with the screw thread outward, second flange (24) with when fixed sleeve (25) cup joint, fixed strip (30) can pass fixed orifices (29) and through screw thread and nut with fixed orifices (29) fixed connection.

7. The tensioned sacrificial anode system for offshore wind power cathodic protection according to claim 1, characterized in that: at least one anti-shearing piece (26) is arranged between the connecting piece (22) and the sacrificial anode (21), and the anti-shearing piece (26) is connected with the connecting piece (22).

8. The tensioned sacrificial anode system for offshore wind power cathodic protection according to claim 7, characterized in that: the anti-shearing piece (26) is of an annular structure, and the anti-shearing piece (26) is welded with the connecting piece (22) or connected with the connecting piece through a hoop.

9. The tensioned sacrificial anode system for offshore wind power cathodic protection according to claim 7, characterized in that: the shear resistant member (26) is a pin.

10. The tensioned sacrificial anode system for offshore wind power cathodic protection according to claim 4, characterized in that: the wind power pile foundation is characterized in that lifting lugs (12) are arranged on the wind power pile foundation (1), one end of a steel wire rope (3) is connected with the lifting lugs (12), the other end of the steel wire rope is connected with the tensioning device (4), a connecting piece (22) is a low-alloy seamless steel pipe, two ends of the connecting piece (22) are welded with a first flange (23), the first flange (23) is connected with a second flange (24) through bolts (5), the steel wire rope (3) is a sealed steel wire rope, lubricating grease is arranged between strands of steel wires of the steel wire rope (3), a sheath (27) is arranged outside the steel wire rope (3), the sheath (27) is made of polyurethane or polyolefin, and the sacrificial anode (21) is an aluminum-based sacrificial anode of aluminum-based, zinc-based, magnesium-based or outer-layer composite magnesium-.