CN113106999B

CN113106999B - Offshore wind power jacket structure with additional viscous damper

Info

Publication number: CN113106999B
Application number: CN202110299330.5A
Authority: CN
Inventors: 王丕光; 张文倩; 董慧慧
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2021-03-21
Filing date: 2021-03-21
Publication date: 2022-11-04
Anticipated expiration: 2041-03-21
Also published as: CN113106999A

Abstract

The utility model provides an additional viscous damper's marine wind power jacket structure relates to the marine wind power field, including four jacket leg posts that use fan tower section of thick bamboo as central evenly distributed, the jacket leg post leans out from top to bottom and sets up to square toper structure, a bracing member that the transitional coupling section and the jacket leg capital end for supporting the fan are through establishing ties with viscous damper is fixed, arbitrary two adjacent jacket leg posts as main support between connect into whole through a plurality of bracing groups that set up along the direction of height, bracing group adopts welding mode cross arrangement to constitute by two bracing members of establishing ties with viscous damper. One end of each inclined strut group and one end of each viscous damper in an inclined strut rod piece which is used for fixing the transition connecting section and is connected with the viscous damper in series are provided with flanges, and the flanges are cast at one end of each inclined strut rod piece and are connected with the inclined strut group through bolts; the other end of the viscous damper is a piston rod, and the other end of the viscous damper and the other end of the diagonal bracing member are respectively connected with the leg column of the jacket in a welding manner. The invention obviously improves the vibration resistance with lower cost.

Description

Offshore wind power jacket structure with additional viscous damper

Technical Field

The invention relates to the field of offshore wind power, in particular to an offshore wind power jacket structure with an additional viscous damper.

Background

At present, the energy crisis is aggravated by the increasing exhaustion of fossil fuels such as petroleum and coal, and the environmental pollution and climate change problems caused by the burning of a large amount of fossil fuels are becoming more serious, and countries and regions in the world are developing and utilizing renewable clean energy as an important component of the energy development strategy and an important method for realizing sustainable development. According to the relevant documents externally released by the development reform Commission and the State energy agency, it is clear that the new energy demand in China will be satisfied mainly by clean energy by 2030. The offshore wind power has the characteristics of rich wind energy resources, high quality, environmental friendliness, suitability for large-scale development and the like, so that the promotion of the development of the offshore wind power industry is one of effective ways for realizing the aims. From the current offshore wind power projects built and to be built in China, a large part of offshore wind power plants are located near earthquake zones, and potential high earthquake damage risks exist. Therefore, it is very important to realize the expectation that the offshore wind turbine and the supporting structure thereof are safely protected and the cost increase is controlled within a certain range by reasonably designing the offshore wind turbine to resist vibration. Among offshore wind turbines with different basic types, the jacket type offshore wind turbine is widely concerned and applied due to the advantages of simple structure, large integral rigidity, suitability for various soil qualities, small workload of offshore installation and the like. At present, a common offshore wind power jacket structure in actual engineering lacks of specific anti-vibration design specifications and industry standards during design, only some counter measures with very limited effects are usually adopted, however, some unpredictable catastrophe behaviors often occur in a complex marine environment, and the application of the measures to resist extreme environmental load effects such as rare storm and strong earthquake is undoubtedly huge in cost and has very little effect.

The traditional anti-vibration method completely depends on the structure to absorb vibration energy input by load, the component is easy to damage under the reciprocating action of the load, and the maintenance cost after vibration is high. With the deep understanding of the mechanism of vibration resistance and the rapid development of vibration resistance technology, energy dissipation and vibration reduction become a development trend of vibration resistance technology, and the realization of an energy dissipation and vibration reduction structural system mainly depends on a simple and practical energy dissipation and vibration reduction device. The viscous damper is a speed-related energy-consuming vibration-damping device, mainly composed of cylinder body, piston rod, viscous fluid and sealing bush, etc. it has the advantages of simple structure, less environmental influence, low cost and convenient construction, etc., and is extensively used in civil engineering field. When wind load or weak shock acts, the viscous damper is in a rigid-elastic state, and the structural system has lateral stiffness enough to meet the normal use requirement; when a storm or a strong shock occurs, along with the continuous increase of the stress and deformation of the structure, the viscous damper enters an inelastic deformation state at first to generate larger damping force, a large amount of vibration energy input into the structure is consumed, the dynamic reaction of the main body structure is quickly attenuated, and the obvious elastoplastic state of the structure system is avoided, so that the safe use of the main body structure is ensured.

The cylinder body of the viscous damper is a high-pressure closed container which is composed of a seamless cylindrical integral steel pipe and has high strength and rigidity, and a sealing bush is arranged at the contact position of the cylinder body and the piston rod, so that a cavity isolated from the external environment is formed inside the viscous damper, the viscous damper can effectively prevent viscous fluid from seeping outwards to avoid oil leakage failure, and metal components in the viscous damper can be protected from being corroded to meet the use requirement during service. The excellent sealing performance of the viscous damper provides technical feasibility for popularization and application in marine environment, so that the development prospect of the viscous damper in the field of marine engineering can be expected to be very wide.

Based on the problems existing in the background art and the existing energy dissipation and vibration reduction device, an offshore wind power jacket structure capable of bearing impact vibration of extreme environmental loads such as storm and strong earthquake is needed.

Disclosure of Invention

The purpose of the invention is: the offshore wind power jacket structure in the prior art is substantially improved, and the offshore wind power jacket structure with the additional viscous damper capable of bearing the effects of extreme environmental loads such as storm and strong earthquake is provided.

The purpose of the invention is realized by adopting the following technical scheme: the utility model provides an additional viscous damper's marine wind power jacket structure, includes four jacket leg posts that use fan tower section of thick bamboo as central evenly distributed, jacket leg post adopts the circular steel pipe of pipe diameters such as, leans out from top to bottom to set up to the square cone structure, and its top is connected with the top girder steel through the welding, be provided with the transitional coupling section that is used for supporting the fan on the girder steel of top, the transitional coupling section with jacket leg post top is fixed through the bracing member of establishing ties with viscous damper, the circular steel pipe of pipe diameters such as bracing member adoption, fan tower section of thick bamboo bottom is through the form and the transitional coupling section fixed connection of ring flange or grout, realizes the fixed mounting of fan and jacket structure. The bottom ends of the jacket leg columns are connected with steel pipe piles buried in the seabed in a grouting mode, and therefore the jacket structure is fixedly installed on the seabed.

Any two adjacent jacket legs serving as main supports are connected into a whole through a plurality of inclined strut groups arranged along the height direction, and each inclined strut group is formed by alternately arranging two inclined strut rod pieces connected with the viscous damper in series in a welding mode. The rigidity and the strength of the inclined strut group and the viscous damper in the inclined strut rod piece connected with the viscous damper in series and used for fixing the transition connection section are smaller than those of the inclined strut rod piece, so that the damper is ensured to deform before the inclined strut rod piece under the action of extreme environmental loads such as storm and strong earthquake, the damper is enabled to enter an energy consumption state, and the inclined strut rod piece and the leg column structure are protected. In addition, the outer surfaces of the viscous dampers and the inclined strut rods in the jacket leg column and the inclined strut group are coated with industrial heavy-duty anticorrosive paint, so that the jacket structure is ensured to have long anticorrosive service life in the marine environment.

The inclined strut group and the viscous damper in the inclined strut rod piece which is used for fixing the transition connecting section and is connected with the viscous damper in series mainly comprise a cylinder body, a piston rod, viscous fluid, a sealing bush, a flange plate and the like. The cylinder body is filled with flowable viscous fluid, the piston rod penetrates through the cylinder body, one end of the piston rod is connected with the jacket leg column through welding, a rectangular or circular flange is sleeved on the cylindrical outer surface of the other end of the piston rod, and the flange is fixedly connected with the cylinder body at the end through annular welding; the piston is arranged in the middle of the piston rod, the diameter of the section of the piston is slightly smaller than that of the inner wall of the cylinder body, and a proper amount of damping holes are arranged in advance to force viscous fluid to flow through the damping holes or a gap between the piston and the cylinder body so as to achieve the aim of viscous energy consumption; the sealing bush is arranged at the contact position of the cylinder body and the piston rod, so that the viscous fluid is prevented from being leaked, and the metal component in the viscous fluid is protected from being rusted, so that the sealing reliability of the damper is ensured, the use requirement of the viscous damper in the service period is met, and the oil leakage failure phenomenon is avoided.

The inclined strut group and the inclined strut rod in the inclined strut rod connected with the viscous damper in series and used for fixing the transitional connection section are circular steel pipes with equal pipe diameters, one end of the inclined strut rod is cast with a flange plate with the shape and the size corresponding to those of a flange plate of the viscous damper, the inclined strut rod and the flange plate of the viscous damper are fixedly connected with one end of the viscous damper in a straight line shape through high-strength bolts, and the other end of the inclined strut rod is connected with the leg column of the jacket through welding. Because the bracing group and be used for fixing adopt the flange joint who has characteristics such as simple structure, easily assembly, dismantlement convenience between viscous damper and the bracing member in the bracing member of the transition connection section and viscous damper series connection, can in time change it as required after viscous damper reaches design service life or meets extreme environmental load effect.

The working mechanism of the invention is as follows: when the jacket is subjected to extreme environmental loads such as storm, strong earthquake and the like, the jacket leg column in the jacket structure generates lateral deformation due to the high structure and large size, and the viscous damper generates axial extension or compression deformation to ensure that the inclined strut rod piece is in an elastic state. When the viscous damper is stretched or compressed, the piston and the cylinder of the viscous damper move relatively, and viscous fluid is forced to rapidly flow between two cavities separated by the piston through the damping hole or the gap. In the reciprocating process of the piston, the damping force generated by the viscous fluid flowing from one cylinder body to the other cylinder body through the holes acts to convert the externally-loaded vibration energy into heat to be dissipated, so that the movement speed of the piston is gradually reduced, the vibration response of the jacket structure is buffered, and the purposes of energy consumption and vibration reduction are achieved.

Compared with the prior art, the invention mainly has the following advantages:

1. the viscous damper is used for consuming vibration energy input by extreme environmental loads such as rare storms, strong earthquakes and the like, the vibration resistance of the offshore wind power jacket structure can be obviously improved, the damage degree of the jacket is reduced to avoid collapse accidents, and therefore the service life of the jacket structure is reasonably and effectively prolonged.

2. Compared with other energy-consuming and damping devices, the viscous damper has the advantages of simple structure, wide raw material source, low processing and manufacturing cost, low later maintenance cost and the like, and can obtain relatively good results at lower cost by selecting the viscous damper to protect the offshore wind power jacket structure under the action of extreme environmental loads such as rare storm, strong earthquake and the like, thereby realizing double benefits of economy and efficiency.

Drawings

FIG. 1 is a schematic perspective view of an offshore wind power jacket structure with additional viscous dampers provided in an embodiment;

FIG. 2 is a front view of an offshore wind power jacket structure with additional viscous dampers provided by an embodiment;

FIG. 3 is a front view of a viscous damper in an offshore wind power jacket structure with additional viscous dampers provided by an embodiment;

FIG. 4 is a right side view of a viscous damper in an offshore wind power jacket structure with additional viscous dampers provided by an embodiment;

FIG. 5 is a schematic diagram of the internal structure of a viscous damper in an offshore wind power jacket structure with an additional viscous damper provided by an embodiment;

fig. 6 is a front view of a diagonal brace bar in series with a viscous damper in an offshore wind power jacket structure with additional viscous dampers provided by an embodiment.

Labeled as: 1. a jacket leg; 2. a diagonal brace member; 3. a viscous damper; 4. a top steel beam; 5. a transition connection section; 6. a piston rod; 7. a cylinder body; 8. a flange plate; 9. bolt holes; 10. a piston; 11. a damping hole; 12. a viscous fluid; 13. a seal bushing; 14. and locking the nut.

Detailed Description

In order to facilitate an understanding of the invention, a more complete and detailed description of the invention will be given below with reference to the accompanying drawings, in which embodiments of the invention are shown, but the invention may be embodied in different forms and is not limited to the embodiments shown in the drawings, but rather these embodiments are provided to make the disclosure of the invention more complete.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "inside", "middle", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Referring to fig. 1 to 6, an additional viscous damper 3's marine wind power jacket structure, including four jacket leg posts 1 that use fan tower section of thick bamboo as central evenly distributed, jacket leg post 1 adopts the circular steel pipe of pipe diameter such as, lean out from top to bottom and set up to the square cone structure, its top is connected with top girder steel 4 through the welding, be provided with the transitional coupling section 5 that is used for supporting the fan on the girder steel 4 of top, fan tower section of thick bamboo bottom is through the form and the 5 fixed connection of transitional coupling section of ring flange or grout, realize the fixed mounting of fan and jacket structure. The bottom end of the jacket leg column 1 is connected with a steel pipe pile buried in the seabed in a grouting mode, and the jacket structure is fixedly installed on the seabed.

In order to enhance the anti-seismic performance of the jacket type offshore wind turbine and prevent the jacket type offshore wind turbine from being damaged under the action of extreme environmental loads such as storm wind, strong earthquake and the like, the jacket structure is additionally provided with the energy dissipation and damping device, and the viscous damper 3 has the advantages of simple structure, convenience in installation and disassembly, lower processing and manufacturing cost, lower later maintenance cost and the like compared with other energy dissipation and damping devices, so that the viscous damper 3 is selected as an additional part of the diagonal bracing member. A bracing member 2 for supporting fan transition linkage section 5 and 1 top of jacket leg are fixed through establishing ties with viscous damper 3, connect into whole through a plurality of bracing group along the direction of height setting between arbitrary two adjacent jacket leg 1 as the main support, the bracing group adopts welding mode cross arrangement to form by two bracing members 2 of establishing ties with viscous damper 3, thereby guarantee the connection steadiness between two adjacent jacket leg 1, further improve the support performance of support group, it is firm more to make whole marine wind power jacket structure. The rigidity and the strength of the inclined strut group and the viscous damper 3 in the inclined strut rod piece 2 which is used for fixing the transition connecting section 5 and is connected with the viscous damper 3 in series are smaller than those of the inclined strut rod piece 2, so that the viscous damper 3 is ensured to deform before the inclined strut rod piece 2 under the action of extreme environmental loads such as storm and strong earthquake, the damper is enabled to enter an energy consumption state, and the inclined strut rod piece 2 and the jacket leg column 1 are protected. In addition, the viscous dampers 3 in the jacket leg column 1 and the inclined strut group and the outer surfaces of the inclined strut rod pieces 2 are coated with industrial heavy anti-corrosion coatings, so that the jacket structure has long anti-corrosion service life in the marine environment.

In the embodiment, the viscous damper 3 in the diagonal bracing group and the diagonal bracing member 2 connected in series with the viscous damper 3 and used for fixing the transition connecting section 5 mainly comprises a cylinder body 7, a piston 10, a piston rod 6, viscous fluid 12, a sealing bush 13, a flange plate 8 and the like, wherein the cylinder body 7 is filled with the flowable viscous fluid 12, the piston rod 6 penetrates through the cylinder body 7, one end of the piston rod is connected with the conduit frame leg column 1 through welding, the other end of the piston rod is sleeved with the rectangular flange plate 8 on the cylindrical outer surface of the piston rod, and the flange plate 8 is fixedly connected with the cylinder body 7 at the other end through annular welding; the piston 10 is arranged in the middle of the piston rod 6, the diameter of the section is slightly smaller than that of the inner wall of the cylinder 7, and a proper amount of damping holes 11 are arranged in advance to force the viscous fluid 12 to flow through the damping holes 11 and a gap between the piston 10 and the cylinder 7 so as to achieve the purpose of viscous energy consumption; the sealing bush 13 is arranged at the contact position of the cylinder 7 and the piston rod 6, so that the viscous fluid 12 is prevented from being leaked outwards, and metal components in the viscous fluid are protected from being rusted, so that the sealing reliability of the damper is ensured, the use requirement of the viscous damper 3 in the service period is met, and the oil leakage failure phenomenon is avoided.

The inclined strut group and the inclined strut rod 2 in the inclined strut rod 2 which is used for fixing the transition connecting section 5 and is connected with the viscous damper 3 in series are circular steel pipes with equal pipe diameters, one end of the inclined strut rod 2 is cast with a flange 8 corresponding to the shape and the size of the flange 8, the inclined strut rod and the viscous damper 3 are fixedly connected with one end with the flange 8 in a straight line shape through high-strength bolts, and the other end of the inclined strut rod is connected with the jacket leg column 1 through welding. Because the inclined strut group and the viscous damper 3 in the inclined strut rod piece 2 which is used for fixing the transition connecting section 5 and is connected with the viscous damper 3 in series are connected with the inclined strut rod piece 2 by flanges with the characteristics of simple structure, easy assembly, convenient disassembly and the like, the viscous damper 3 can be replaced as required after reaching the design service life or meeting the action of extreme environmental loads.

In the manufacturing process of the embodiment, the components such as the jacket leg column 1, the top steel beam 4, the transition connecting section 5, the diagonal bracing member 2 and the viscous damper 3 are all processed and manufactured in a factory according to the model size required by the actual engineering. The jacket structure plays a role in starting and stopping in the offshore wind turbine, so that the strength, rigidity and manufacturing precision of the jacket structure are very high, all component parts can be assembled only after being inspected to be qualified, and the jacket structure is integrally transported to a specified sea area after the assembly is finished, so that the assembly type manufacturing, transporting and producing processes are realized.

In the embodiment, a pile-first construction technology is adopted during installation, the jacket structure is vertically and downwards hoisted to a designated position, the four jacket leg columns 1 are inserted into four steel pipe piles which are pre-driven into the seabed, leveling is not needed in the butt joint process, the jacket leg columns 1 are fixedly connected with the steel pipe piles through underwater grouting, so that the single piles are organically connected into a whole, and the fixed installation of the jacket structure on the seabed is realized. When carrying out superstructure's installation, in order to ensure construction safety and accelerate the construction progress, utilize the jacket to erect interim construction platform to pass through the form of ring flange or grout and 5 fixed connection of transition connection section of jacket structure with fan tower section of thick bamboo bottom, realize the fixed mounting of fan and jacket structure. The jacket structure serves as a connecting channel between the upper structure and the seabed and can be used for supporting auxiliary facilities of an offshore wind turbine generator system. The guide pipe frame is provided with ship equipment and can also stop a working ship.

In the embodiment, when the jacket leg column is used, under the action of extreme environmental loads such as storm and strong earthquake, the jacket leg column 1 generates lateral deformation, and the viscous damper 3 in the inclined strut group generates axial extension or compression deformation. As shown in fig. 5 and 6, when the viscous damper 3 connected in series with the sprag rod 2 is stretched, the piston rod 6 of the viscous damper 3 moves leftward relative to the cylinder 7, moving the piston 10 leftward, and the viscous fluid 12 moves rightward through the damping hole 11 and the gap between the piston 10 and the cylinder 7; when the viscous damper 3 connected in series with the sprag rod 2 is compressed, the piston rod 6 of the viscous damper 3 moves rightward relative to the cylinder 7, moving the piston 10 rightward, and the viscous fluid 12 moves leftward through the damping hole 11 and the gap between the piston 10 and the cylinder 7. In the reciprocating process of the piston 10, the energy generated by wind vibration and earthquake can be effectively attenuated gradually by applying work through the damping force generated by the viscous fluid 12 flowing from one side of the cylinder 7 to the other side through the hole, so that the movement speed of the piston 10 is gradually reduced, the vibration response of the jacket structure is buffered, the obvious elastoplastic state of the structure is avoided, and finally the purposes of energy consumption and vibration reduction are achieved to ensure the safe use of the jacket type offshore wind turbine in the embodiment during service. Over time, when the viscous damper 3 in the present embodiment reaches the design service life or is subjected to extreme environmental loads, it can be removed and replaced with a new one in time if severe damage occurs, and can be used continuously if no damage occurs after inspection.

Finally, it should be noted that the above-mentioned embodiments and the description only illustrate the basic principles and main features of the present invention, and do not limit the present invention in any way, and those skilled in the art can change or modify the technical content disclosed above into equivalent embodiments with equivalent changes. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the claims of the present invention, unless departing from the technical spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an offshore wind power jacket structure of additional viscous damper which characterized in that: the guide pipe frame comprises four guide pipe frame leg columns which are uniformly distributed by taking a fan tower cylinder as a center, the guide pipe frame leg columns are obliquely arranged from top to bottom to form a square conical structure, any two adjacent guide pipe frame leg columns used as main supports are connected into a whole through a plurality of inclined strut groups arranged along the height direction, and each inclined strut group is formed by alternately arranging two inclined strut rod pieces connected with a viscous damper in series in a welding mode;

the top ends of the guide pipe frame leg columns are connected with a top steel beam through welding, a transition connecting section for supporting a fan is arranged on the top steel beam, the transition connecting section and the top ends of the guide pipe frame leg columns are fixed through an inclined strut rod piece connected with a viscous damper in series, and the bottom of a fan tower cylinder is fixedly connected with the transition connecting section through a flange plate or a grouting mode;

the rigidity and the strength of the diagonal brace group and the viscous damper in the diagonal brace rod piece which is used for fixing the transition connection section and is connected with the viscous damper in series are smaller than those of the diagonal brace rod piece, so that the damper is ensured to deform before the diagonal brace rod piece under the action of extreme environmental load, the damper is enabled to enter an energy consumption state, and the diagonal brace rod piece and the leg column structure are protected;

the viscous damper comprises a cylinder body, a piston rod, viscous fluid, a sealing bush and a flange plate, wherein the cylinder body is filled with flowing viscous fluid, the piston rod penetrates through the cylinder body, one end of the piston rod is connected with a leg column of the jacket through welding, the cylindrical outer surface of the other end of the piston rod is sleeved with a rectangular flange plate, and the flange plate is fixedly connected with the cylinder body at the end through annular welding; the piston is arranged in the middle of the piston rod, the diameter of the cross section of the piston is smaller than that of the inner wall of the cylinder body, and the damping hole is arranged in advance, so that viscous fluid flows through the damping hole and a gap between the piston and the cylinder body, and the purpose of viscous energy consumption is achieved; a sealing bush is arranged at the contact position of the cylinder body and the piston rod to prevent the viscous fluid from being leaked outwards and protect the metal components in the viscous fluid from being rusted, so that the sealing reliability of the damper is ensured;

the offshore wind power jacket structure is installed by adopting a pile-first construction technology, the jacket structure is vertically and downwards hoisted to a specified position, four jacket leg columns are inserted into four steel pipe piles which are pre-driven into the seabed, leveling is not needed in the butt joint process, the jacket leg columns are fixedly connected with the steel pipe piles through underwater grouting, so that the single piles are connected into a whole, and the fixed installation of the jacket structure on the seabed is realized; when the upper structure is installed, a temporary construction platform is erected by using the jacket, so that the bottom of the fan tower cylinder is fixedly connected with the transition connecting section of the jacket structure in a flange plate or grouting mode, and the fixed installation of the fan and the jacket structure is realized; the jacket structure serves as a connecting channel between the superstructure and the seabed for supporting the auxiliary equipment of the offshore wind turbine.

2. Offshore wind power jacket structure according to claim 1, characterized in that: the inclined strut group and one end of a viscous damper in an inclined strut rod piece which is used for fixing the transition connection section and is connected with the viscous damper in series are rectangular or circular flange plates, one end of the inclined strut rod piece is cast with a flange plate corresponding to the shape and the size of the inclined strut rod piece, and the inclined strut group and the flange plate are connected in a straight line shape through high-strength bolts; and the other end of the viscous damper is a piston rod, and the other end of the viscous damper and the other end of the diagonal bracing member are respectively connected with the leg column of the jacket in a welding manner.

3. Offshore wind power jacket structure according to claim 1, characterized in that: the inclined strut group and the viscous damper in the inclined strut rod piece connected with the viscous damper in series in the transitional connection section are connected with the inclined strut rod piece through flanges, and the viscous damper is replaced after the design service life is reached or the extreme environment load effect is encountered.

4. Offshore wind power jacket structure according to claim 1, characterized in that: and industrial heavy anti-corrosion paint is coated on the outer surfaces of the viscous damper and the diagonal bracing member in the jacket leg column and the diagonal bracing group.