CN113417311A - Offshore wind power multi-cylinder jacket foundation construction method - Google Patents
Offshore wind power multi-cylinder jacket foundation construction method Download PDFInfo
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- CN113417311A CN113417311A CN202110666702.3A CN202110666702A CN113417311A CN 113417311 A CN113417311 A CN 113417311A CN 202110666702 A CN202110666702 A CN 202110666702A CN 113417311 A CN113417311 A CN 113417311A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/005—Equipment to decrease ship's vibrations produced externally to the ship, e.g. wave-induced vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/4433—Floating structures carrying electric power plants
- B63B2035/446—Floating structures carrying electric power plants for converting wind energy into electric energy
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Abstract
The invention belongs to the technical field of offshore wind power foundations, and discloses a construction method of an offshore wind power multi-cylinder jacket foundation, which is characterized in that a plurality of multi-cylinder jacket foundations and a flat ship are assembled into an integrated floating body structure, and are transported, installed and recovered; a plurality of multi-cylinder jacket foundations are distributed on two sides of the flat ship, and the side part of each multi-cylinder jacket foundation is welded with the flat ship. The invention utilizes the self-floating stability of the multi-cylinder jacket foundation to actively store certain gas in the suction cylinder, welds the multi-cylinder jacket foundation and the flat ship into an integrated floating body structure, has certain advantages in the processes of assembly, transportation, installation and recovery of the foundation, can reduce the requirement on offshore equipment during the construction of the multi-cylinder jacket foundation, and has the advantages of simple and efficient whole construction process, strong construction controllability, high precision and easy realization.
Description
Technical Field
The invention belongs to the technical field of offshore wind power foundations, and particularly relates to a construction method of an offshore wind power multi-cylinder jacket foundation.
Background
Traditional offshore wind power jacket basis is fixed in the seabed through the pile foundation of squeezing into the mud face, need ensure after targetting in place that the basis inserts corresponding hole site, and jacket hoist and mount weight is big in this in-process, hoist and mount safety requires highly and counterpoint the degree of difficulty and all be the problem that must solve mostly. At present, a suction cylinder type jacket foundation is transported to a site by a large ship in a dry towing mode, a machine head, a tower drum and blades of the suction cylinder type jacket foundation are often transported separately by a transportation barge, dependence on large equipment on the sea is high, and the construction period is long.
The suction cylinder type foundation has simple form, easy construction and wide market prospect. When a traditional multi-cylinder jacket foundation is constructed, a crane needs to hoist the whole foundation, and the requirement on hoisting equipment is high. In the traditional process of putting the multi-tube jacket foundation down in water for installation, the flatness of the foundation is adjusted by a crane, so that the relative difficulty is high; when the foundation is lowered to the soil body to be penetrated through by suction, the pressure difference between the inside and the outside of the cylinder body is formed by pumping water so as to press the foundation into the soil body, generally, a water pump needs to work continuously, the pressure difference between the inside and the outside of the cylinder body is small, and the construction speed is relatively slow.
Disclosure of Invention
The invention provides a construction method of an offshore wind power multi-cylinder jacket foundation, aiming at solving the technical problems that the offshore wind power multi-cylinder jacket foundation has higher requirements on offshore construction equipment in the construction process and the underwater construction gradient is difficult to control.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a construction method of a multi-cylinder jacket foundation of offshore wind power comprises the steps of assembling a plurality of multi-cylinder jacket foundations and a flat ship into an integrated floating body structure, and carrying out transportation, installation and recovery;
a plurality of multi-cylinder jacket foundations are distributed on two sides of the flat ship, and each multi-cylinder jacket foundation is welded with the flat ship through the side part of a suction cylinder of each multi-cylinder jacket foundation; assembling each multi-tube jacket foundation with the flat ship according to the following steps:
(1) opening cylinder top valves of all suction cylinders of the multi-cylinder jacket foundation, inflating the suction cylinders until the multi-cylinder jacket foundation is in self-floating balance, and closing the cylinder top valves;
(2) welding the multi-tube jacket foundation and the flat ship together through reserved welding spots;
(3) and opening cylinder top valves of the suction cylinders of the multi-cylinder jacket foundation, and closing the cylinder top valves of the suction cylinders of the multi-cylinder jacket foundation after the integral structure formed by the multi-cylinder jacket foundation and the flat ship to be welded is in self-floating balance.
Further, when the number of the multi-tube jacket foundations is double, the multi-tube jacket foundations are symmetrically distributed on two sides of the flat ship; when the number of the multi-tube jacket foundations is singular, the multi-tube jacket foundations are preferentially arranged in the middle of two sides of the flat ship and then are sequentially arranged towards the end parts of the two sides of the flat ship.
Further, the assembly sequence of the multi-tube jacket foundation and the flat ship is as follows: firstly, installing the multi-tube jacket foundation in the middle of the flat ship, and then installing the multi-tube jacket foundation at the end part of the flat ship; and two multi-tube jacket foundations symmetrically arranged on two sides of the flat ship are installed in an adjacent sequence.
Further, the reserved welding points are respectively arranged on the two sides of the flat ship and the side part of the suction cylinder on the ship-side of the multi-cylinder jacket foundation.
Further, a rubber fender is arranged around the reserved welding point of the flat ship.
Furthermore, in the transportation process, the cylinder top valves are used for inflating the suction cylinders of the multi-cylinder jacket foundation, so that the gravity center height of the integrated floating body structure can be raised.
Furthermore, in the transportation process, the cylinder top valve is opened to deflate each suction cylinder of the multi-cylinder jacket foundation, so that the gravity center height of the integrated floating body structure can be lowered.
Further, the installation process is performed according to the following steps:
a. connecting a crane hoist cable with a lifting lug of the multi-cylinder jacket foundation;
b. removing the welding between the multi-tube jacket foundation and the flat ship;
c. opening the tube top valve to inflate each suction tube of the multi-tube jacket foundation until the buoyancy of the multi-tube jacket foundation is 10% -15% of the dead weight, providing a lifting force of 10% -15% of the dead weight of the multi-tube jacket foundation by the crane, and closing the tube top valve;
d. the multi-cylinder jacket foundation is lowered by using the crane, after each suction cylinder of the multi-cylinder jacket foundation is sunk below a still water surface, the cylinder top valve is opened to continuously inflate each suction cylinder of the multi-cylinder jacket foundation so as to maintain the lifting force of the crane at 10% -15% of the dead weight of the multi-cylinder jacket foundation until the multi-cylinder jacket foundation is lowered to a soil body and does not continue to be lowered, and the lifting force of the crane is removed;
e. deflating each suction tube of the multi-tube jacket foundation through the tube top valve, and continuously pressing each suction tube of the multi-tube jacket foundation into a soil body;
f. after the gas in the cylinders of the suction cylinders of the multi-cylinder jacket foundation is released, pumping water to the suction cylinders of the multi-cylinder jacket foundation through the cylinder top valve, so that all the suction cylinders of the multi-cylinder jacket foundation are sunk into the soil.
Furthermore, in the lowering process of the multi-cylinder jacket foundation in the step e, the lowering speed of each suspension cable of the crane and the opening degree of a cylinder top valve of each suction cylinder of the multi-cylinder jacket foundation are adjusted to jointly level.
Further, the recovery process is carried out according to the following steps:
a. connecting a crane hoist cable with a lifting lug of the multi-cylinder jacket foundation;
b. filling water into each suction tube of the multi-tube jacket foundation through the tube top valve until all the suction tubes are ejected out of a soil body;
d. inflating each suction tube of the multi-tube jacket foundation through the tube top valve until the buoyancy of the multi-tube jacket foundation reaches 85% -90% of the self weight of the multi-tube jacket foundation, and closing the tube top valve;
e. lifting the multi-cylinder jacket foundation by a crane, wherein the crane provides a lifting force of 10% -15% of the self weight of the multi-cylinder jacket foundation; continuously deflating each suction tube of the multi-tube jacket foundation through the tube top valve in the lifting process so as to maintain the lifting force of the crane at 10% -15% of the self weight of the multi-tube jacket foundation;
d. after the top surfaces of the suction tubes of the multi-tube jacket foundation reach a still water surface, stopping deflating the suction tubes of the multi-tube jacket foundation, continuously lifting the multi-tube jacket foundation through a crane, and inflating the suction tubes of the multi-tube jacket foundation through a tube top valve until the self-floating balance of the multi-tube jacket foundation is realized;
e. and welding the multi-tube jacket foundation 1 and the flat ship together through reserved welding points.
The invention has the beneficial effects that:
the construction method of the offshore wind power multi-cylinder jacket foundation utilizes the self-floating stability of the multi-cylinder jacket foundation to actively store a certain amount of gas in the suction cylinder, welds the multi-cylinder jacket foundation and a flat ship into an integrated floating body structure, and has certain advantages in the processes of foundation assembly, transportation, installation and recovery.
In the assembly process, the self-floating balanced multi-cylinder jacket foundation in the wharf and a flat ship are welded to form an integrated floating body structure with self-floating stability, the fan head, the blades and the tower cylinder are placed on the flat ship by using a wharf crane, the assembly process can be synchronously carried out, large wharf equipment is not needed for assembly, and the assembly process is rapid, safe and easy to realize.
In the transportation process, the gravity center of the integrated floating body structure can be adjusted by controlling gas in the cylinders of the multi-cylinder jacket basic suction cylinder, the requirement on a navigation channel in transportation can be reduced, the integrated floating body structure can also adapt to severe marine environments, and the anti-inclination self-adjustment capability of the integrated floating body structure is improved.
In the installation process, the multi-cylinder jacket foundation can be lowered after being connected with the floating crane without lifting, and the requirement on the floating crane is low; hang power by the soil body balanced back, through gaseous in the bobbin of bobbin top valve release section of thick bamboo, the buoyancy that gaseous in the section of thick bamboo provided can be in turn with the quick soil body of impressing of a plurality of tube jacket foundations, compare in the scheme of drawing water, its pressure differential is bigger, and the speed of sinking is faster, and the penetrating force is stronger, more is favorable to the basis to sink to can be through the levelness on a plurality of tube jacket foundations of many tube jacket foundation release speed control, its process of sinking easy operation, accuracy height.
In the recovery process, the air is pumped into the suction barrel of the multi-barrel jacket foundation to supply upward buoyancy, the floating crane only provides partial tension, the requirement on the floating crane is low, the stability in the recovery process can be adjusted by controlling the air pumping quantity and the floating crane together, the foundation is directly welded with a transport ship after self-floating balance above the water surface, and the recovery process is simple and easy to operate.
Therefore, the construction method of the offshore wind power multi-cylinder jacket foundation can reduce the requirements on offshore equipment during the construction of the multi-cylinder jacket foundation, and is strong in integrated structure stability, simple and efficient in the whole construction process, strong in construction controllability, high in precision and easy to realize.
Drawings
FIG. 1 is a schematic diagram of a construction method of a multi-barrel jacket foundation for offshore wind power provided by the invention;
FIG. 2 is a schematic view of the connection between the multi-jacket foundation and the flat vessel in the construction method of the present invention;
FIG. 3 is a schematic diagram of a weld block reservation for a multi-jacket foundation in a construction method provided by the present invention;
FIG. 4 is a schematic diagram of a single suction tube in a multi-tube jacket foundation in accordance with the present invention;
FIG. 5 is a schematic view of a three-in-three arrangement of multi-jacket foundations in the construction method provided by the present invention;
FIG. 6 is a schematic view of the construction process of lowering the suction tube in the multi-tube jacket foundation in the construction method of the present invention;
FIG. 7 is a schematic diagram illustrating a construction process for recovering a suction tube in a multi-tube jacket foundation according to the construction method of the present invention;
in the above figures: 1. a multi-cylinder jacket foundation 2, a flat ship 3, a machine head 4, blades 5 and tower sections of a tower cylinder; 6. the method comprises the steps of reserving a welding block, 7, a rubber fender, 8, a cylinder top reinforcing section, 9, a suction cylinder, 10, a cylinder top valve, 11, a jacket, 12, a still water surface, 13, a soil body, 14 and gas in the cylinder.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in fig. 1 and 2, the invention provides a construction method of a multi-cylinder jacket foundation of offshore wind power, which assembles a plurality of multi-cylinder jacket foundations 1 and a flat vessel 2 into an integrated floating body structure for transportation, installation and recovery, improves the precision and controllability of the construction process, reduces the requirements on offshore construction equipment, simplifies construction operation and saves construction cost.
As shown in fig. 3 and 4, the multi-barrel jacket foundation 1 generally includes 3 to 4 suction barrels 9, and the plurality of suction barrels 9 are connected to the jacket 11 through the upper barrel top reinforcing section 8 thereof. The main body of the suction tube 9 is a steel tube and is composed of a tube wall and a tube top cover plate. The bobbin top cover plate upper portion is equipped with bobbin top reinforcement section 8, and bobbin top reinforcement section 8 includes the center post of bobbin top cover plate central point position and the floor of radial equipartition on the bobbin top cover plate, and the floor extends to bobbin top cover plate edge by the center post, and every floor top is provided with the web, is connected with the reinforcing plate between the adjacent floor. The cylinder top cover plate is provided with four cylinder top valves 10, the four cylinder top valves 10 are symmetrically arranged on two sides of the cylinder top cover plate in a pairwise mode, two cylinder top valves 10 are commonly used, and the other two cylinder top valves 10 are reserved. The jacket 11 is formed by welding a space truss and a transition section, the bottom of a stand column of the space truss is connected to a central column of the top reinforcement section 8, and the transition section is used for being connected with a tower barrel. The multi-tube jacket foundation 1 is high in structural strength, strong in bearing capacity, fast and simple in installation process, high in precision and strong in applicability to deep-water wind power plants.
The vessel 2 is a hull with a flat deck, and a general marine vessel can meet the requirements.
The multi-cylinder jacket foundation 1 and the flat vessel 2 are assembled in such a manner that a plurality of multi-cylinder jacket foundations 1 are distributed on both sides of the flat vessel 2, and each multi-cylinder jacket foundation 1 is welded to the flat vessel 2 through the side portion of a suction cylinder 9 thereof. The fan tower 5, the machine head 3 and the blades 4 can be placed on a deck of the flat ship 2, components required by the wind power complete machine are transported to an installation site at one time, and batch transportation of the multi-cylinder jacket foundation 1 can be achieved.
The number of multi-barrel jacket bases 1 is typically 3-6. When the number of the multi-tube jacket bases 1 is double, the multi-tube jacket bases 1 are preferably symmetrically distributed on two sides of the flat ship 2. When the number of the multi-tube jacket bases 1 is singular, the multi-tube jacket bases 1 are preferably arranged in the middle of the two sides of the flat vessel 2, and are preferably arranged towards the end parts of the two sides of the flat vessel 2 in sequence, as shown in fig. 5.
The assembly sequence of all multi-tube jacket foundations 1 and the flat vessel 2 is preferably as follows: firstly, installing a multi-cylinder jacket foundation 1 positioned in the middle of a flat ship 2, and then installing the multi-cylinder jacket foundation 1 positioned at the end part of the flat ship 2; and two multi-tube jacket foundations 1 symmetrically arranged on both sides of the flat vessel 2 are installed in an adjacent order. Therefore, the integral stability of the multi-tube jacket foundation 1 and the flat ship 2 is kept in the assembling process, the assembling time is shortened, and the construction speed is accelerated.
The assembly process of each multi-tube jacket foundation 1 and the flat ship 2 is as follows:
a. opening cylinder top valves 10 of all the suction cylinders 9 of the multi-cylinder jacket foundation 1 for inflation, and closing the cylinder top valves 10 of all the suction cylinders 9 after the self-floating balance of the multi-cylinder jacket foundation 1 is realized by inflating the interiors of the suction cylinders 9;
b. welding the multi-tube jacket foundation 1 and the flat ship 2 together through a reserved welding spot 6;
Reserved welding points 6 are arranged on the side portion, close to the ship, of the suction barrel 9 of the multi-barrel jacket foundation 1, and the reserved welding points 6 of the multi-barrel jacket foundation 1 are welded with the suction barrel 9 through steel pipes.
Preferably, the reserved welding points 6 are respectively arranged on the self-floating balance draft lines of the multi-tube jacket foundation 1 and the flat ship 2 for 2-5m, so that the multi-tube jacket foundation and the flat ship can be conveniently welded, and the shearing force at the welding points is reduced when the integrated structure is towed;
c. after the welding is finished, the cylinder top valves 10 of the suction cylinders 9 are opened, the gas 14 in the cylinders is released or supplemented, and after the integral structure formed by the multi-cylinder jacket foundation 1 and the flat ship 2 is in self-floating balance, the cylinder top valves 10 of the suction cylinders 9 are closed.
In this way, all the multi-tube jacket foundations 1 are assembled to both sides of the flat vessel 2 to form an integrated floating body structure.
In the construction method of the offshore wind power multi-cylinder jacket foundation, the formed integrated floating body structure has certain anti-overturning self-adjusting capacity because part of gas is actively stored in the suction cylinders 9 of the multi-cylinder jacket foundation 1 in the transportation process, and when the inclination of the integrated floating body structure is overlarge, the gas 14 in the cylinders of the multi-cylinder jacket foundation 1 on the two sides of the flat vessel 2 can be adjusted to be leveled. That is, when the integrated floating body structure is inclined, the gas 14 in the cylinder of the multi-cylinder jacket foundation 1 on the lower side is compressed, and the reaction force is increased; the gas 14 in the cylinder of the multi-cylinder jacket foundation 1 at the higher side is under-pressure, the water level in the cylinder rises, and the adsorption force is generated; it can be seen that the integrated floating body structure has self-adjusting capability against overturning.
When the channel becomes shallow, all the suction cylinders 9 of the multi-cylinder jacket foundation 1 are inflated through the cylinder top valves 10, so that the gravity center of the integrated floating body rises, the requirement on the channel water depth is lowered, and the applicability of the transportation of the integrated floating body structure is increased.
When the storm is large, the cylinder top valve 10 can be opened, and the gas 14 in each suction cylinder 9 of all the multi-cylinder jacket foundations 1 is released, so that the gravity center of the integrated floating body structure is lowered, and the heavy stability in the transportation process is improved.
According to the offshore wind power multi-cylinder jacket foundation construction method provided by the invention, the formed integrated floating body structure is transported to the site and then installed, the requirement on the lifting force of the floating crane is lower, the suction cylinder is mainly realized in the stage of sinking into the soil body in an exhaust mode, the penetration is easier, and the construction speed is higher.
The installation process of the multi-tube jacket foundation 1 is carried out according to the following steps:
a. the crane hoist cable is connected with lifting lugs of a multi-cylinder jacket foundation 1 to be installed, the lifting lugs of the multi-cylinder jacket 1 are uniformly distributed at the top of the transition section of a jacket 11, and the quantity of the lifting lugs is generally the same as that of the suction cylinders 9.
b. And cutting off the steel pipe connecting the reserved welding point 6 of the multi-tube jacket foundation 1 and the suction tube 9, thereby removing the connection between the multi-tube jacket foundation 1 and the flat ship 2, and polishing the connection part of the suction tube 9 of the multi-tube jacket foundation 1 and the steel pipe smoothly.
c. And opening the cylinder top valve 10, and closing the cylinder top valve 10 by inflating the suction cylinder 9 until the buoyancy of the multi-cylinder jacket foundation 1 is less than 10% -15% of the dead weight, namely the crane provides the lifting force of 10% -15% of the dead weight of the multi-cylinder jacket foundation 1.
d. As shown in fig. 6, a crane is used for lowering a multi-cylinder jacket foundation 1, after each suction cylinder 9 sinks below a still water surface 12, each suction cylinder 9 is continuously inflated through a cylinder top valve 10 to maintain the lifting force of the crane between 10% and 15% until each suction cylinder 9 descends to a certain depth of a soil body 13, the lifting force of the crane is balanced by the resistance of the soil body 13, the multi-cylinder jacket foundation 1 does not descend any more, and then a lifting hook is released to remove the lifting force.
In the process of lowering the multi-jacket foundation 1, the leveling can be performed under the combined action of the lowering speed of the suspension cables connected with different positions at the top of the transition section of the jacket 11 and the opening degree of the cylinder top valve 10 of each suction cylinder 9.
e. And (3) deflating each suction tube 9 through a tube top valve 10, and continuously pressing each suction tube 9 into the soil body 13.
f. After all the gas 14 in each suction tube 9 is released, the suction tubes 9 are continuously pumped through the tube top valve 10, so that all the suction tubes 9 are sunk into the soil body 13.
Until the multi-cylinder jacket foundation 1 is installed, the fan tower 5, the head 3 and the blades 4 can be sequentially lifted from the flat ship 2 and installed on the multi-cylinder jacket foundation 1.
The construction method for the offshore wind power multi-cylinder jacket foundation provided by the invention can be used for recovering the multi-cylinder jacket foundation 1, and has the advantages of high controllability in the recovery process, simplicity and convenience in operation and low requirement on recovery equipment.
Before the multi-barrel jacket foundation 1 is recovered, the machine head 3 and the blades 4 are firstly disassembled, and the tower barrel 5 can be left disassembled according to the transportation sea condition or only part of the tower barrel can be disassembled. The recovery process of the multi-tube jacket foundation 1 is carried out according to the following steps:
a. the multi-cylinder jacket foundation 1 is connected with a crane hoist cable.
b. As shown in fig. 7, the top valve 10 is opened to fill the suction cylinders 9 with water until all the suction cylinders 9 are ejected out of the soil 13.
d. And inflating each suction tube 9 through the tube top valve 10 until the buoyancy of the multi-tube jacket foundation 1 reaches 85% -90% of the self weight of the multi-tube jacket foundation 1, stopping inflating, and closing the tube top valve 10.
e. Lifting the multi-cylinder jacket foundation 1 by a crane, wherein the crane provides a lifting force of 10% -15% of the self weight of the multi-cylinder jacket foundation 1; in the process of lifting the multi-cylinder jacket foundation 1, the gas 14 in each suction cylinder 9 expands, the buoyancy of the multi-cylinder jacket foundation 1 increases, and the gas 14 in each suction cylinder 9 needs to be slowly released through a cylinder top valve 10 so as to maintain the lifting force of the crane within the range of 10% -15% of the self weight of the multi-cylinder jacket foundation 1.
d. After the top cover plate of each suction tube 9 of the multi-tube jacket foundation 1 reaches the still water surface 12, stopping releasing gas 14 in the tube of each suction tube 9 through a tube top valve 10, continuously lifting the multi-tube jacket foundation 1 through a crane, and inflating each suction tube 9 through the tube top valve 10 until the multi-tube jacket foundation 1 realizes self-floating balance;
e. the multi-tube jacket foundation 1 and the flat ship 2 are welded together through the reserved welding points 6.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make various changes and modifications within the spirit and scope of the present invention without departing from the spirit and scope of the appended claims.
Claims (10)
1. A construction method of a multi-cylinder jacket foundation of offshore wind power is characterized in that a plurality of multi-cylinder jacket foundations and a flat ship are assembled into an integrated floating body structure, and transportation, installation and recovery are carried out;
a plurality of multi-cylinder jacket foundations are distributed on two sides of the flat ship, and each multi-cylinder jacket foundation is welded with the flat ship through the side part of a suction cylinder of each multi-cylinder jacket foundation; assembling each multi-tube jacket foundation with the flat ship according to the following steps:
(1) opening cylinder top valves of all suction cylinders of the multi-cylinder jacket foundation, inflating the suction cylinders until the multi-cylinder jacket foundation is in self-floating balance, and closing the cylinder top valves;
(2) welding the multi-tube jacket foundation and the flat ship together through reserved welding spots;
(3) and opening cylinder top valves of the suction cylinders of the multi-cylinder jacket foundation, and closing the cylinder top valves of the suction cylinders of the multi-cylinder jacket foundation after the integral structure formed by the multi-cylinder jacket foundation and the flat ship to be welded is in self-floating balance.
2. The offshore wind power multi-cylinder jacket foundation construction method of claim 1, wherein when the number of the multi-cylinder jacket foundations is double, the multi-cylinder jacket foundations are symmetrically distributed on two sides of the flat ship; when the number of the multi-tube jacket foundations is singular, the multi-tube jacket foundations are preferentially arranged in the middle of two sides of the flat ship and then are sequentially arranged towards the end parts of the two sides of the flat ship.
3. The offshore wind power multi-cylinder jacket foundation construction method of claim 1, wherein the assembly sequence of the multi-cylinder jacket foundation and the flat vessel is as follows: firstly, installing the multi-tube jacket foundation in the middle of the flat ship, and then installing the multi-tube jacket foundation at the end part of the flat ship; and two multi-tube jacket foundations symmetrically arranged on two sides of the flat ship are installed in an adjacent sequence.
4. The method as claimed in claim 1, wherein the reserved welding points are respectively disposed at both sides of the flat vessel and at a side portion of the suction tube near the vessel side of the multi-tube jacket foundation.
5. The offshore wind power multi-cylinder jacket foundation construction method of claim 1, wherein the flat vessel is provided with a rubber fender around the reserved welding point.
6. The offshore wind power multi-cylinder jacket foundation construction method as recited in claim 1, wherein during the transportation process, the cylinder top valve is used for inflating each suction cylinder of the multi-cylinder jacket foundation, so that the gravity center height of the integrated floating body structure can be raised.
7. The offshore wind power multi-cylinder jacket foundation construction method according to claim 1, wherein during the transportation process, the cylinder top valve is opened to deflate each suction cylinder of the multi-cylinder jacket foundation, so that the gravity center height of the integrated floating body structure can be lowered.
8. The offshore wind power multi-barrel jacket foundation construction method according to claim 1, characterized in that the installation process is carried out according to the following steps:
a. connecting a crane hoist cable with a lifting lug of the multi-cylinder jacket foundation;
b. removing the welding between the multi-tube jacket foundation and the flat ship;
c. opening the tube top valve to inflate each suction tube of the multi-tube jacket foundation until the buoyancy of the multi-tube jacket foundation is 10% -15% of the dead weight, providing a lifting force of 10% -15% of the dead weight of the multi-tube jacket foundation by the crane, and closing the tube top valve;
d. the multi-cylinder jacket foundation is lowered by using the crane, after each suction cylinder of the multi-cylinder jacket foundation is sunk below a still water surface, the cylinder top valve is opened to continuously inflate each suction cylinder of the multi-cylinder jacket foundation so as to maintain the lifting force of the crane at 10% -15% of the dead weight of the multi-cylinder jacket foundation until the multi-cylinder jacket foundation is lowered to a soil body and does not continue to be lowered, and the lifting force of the crane is removed;
e. deflating each suction tube of the multi-tube jacket foundation through the tube top valve, and continuously pressing each suction tube of the multi-tube jacket foundation into a soil body;
f. after the gas in the cylinders of the suction cylinders of the multi-cylinder jacket foundation is released, pumping water to the suction cylinders of the multi-cylinder jacket foundation through the cylinder top valve, so that all the suction cylinders of the multi-cylinder jacket foundation are sunk into the soil.
9. The method for constructing the offshore wind power multi-cylinder jacket foundation according to claim 8, wherein during the lowering of the multi-cylinder jacket foundation in the step e, the leveling is performed jointly by adjusting the lowering speed of each suspension cable of the crane and the opening degree of a cylinder top valve of each suction cylinder of the multi-cylinder jacket foundation.
10. The offshore wind power multi-barrel jacket foundation construction method according to claim 1, characterized in that the recovery process is carried out according to the following steps:
a. connecting a crane hoist cable with a lifting lug of the multi-cylinder jacket foundation;
b. filling water into each suction tube of the multi-tube jacket foundation through the tube top valve until all the suction tubes are ejected out of a soil body;
d. inflating each suction tube of the multi-tube jacket foundation through the tube top valve until the buoyancy of the multi-tube jacket foundation reaches 85% -90% of the self weight of the multi-tube jacket foundation, and closing the tube top valve;
e. lifting the multi-cylinder jacket foundation by a crane, wherein the crane provides a lifting force of 10% -15% of the self weight of the multi-cylinder jacket foundation; continuously deflating each suction tube of the multi-tube jacket foundation through the tube top valve in the lifting process so as to maintain the lifting force of the crane at 10% -15% of the self weight of the multi-tube jacket foundation;
d. after the top surfaces of the suction tubes of the multi-tube jacket foundation reach a still water surface, stopping deflating the suction tubes of the multi-tube jacket foundation, continuously lifting the multi-tube jacket foundation through a crane, and inflating the suction tubes of the multi-tube jacket foundation through a tube top valve until the self-floating balance of the multi-tube jacket foundation is realized;
e. and welding the multi-tube jacket foundation 1 and the flat ship together through reserved welding points.
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| CN113700029A (en) * | 2021-09-22 | 2021-11-26 | 中交第一航务工程局有限公司 | Floating transportation method for suction pile jacket |
| CN114102065A (en) * | 2021-12-07 | 2022-03-01 | 南通振华重型装备制造有限公司 | Method for mounting suction barrel cover |
| CN114150694A (en) * | 2021-12-02 | 2022-03-08 | 天津大学 | Offshore wind power multi-cylinder annular occlusion foundation structure |
| CN114802650A (en) * | 2022-04-28 | 2022-07-29 | 上海华润大东船务工程有限公司 | Precision control process for installing suction cylinder type jacket in floating dock |
| CN115404894A (en) * | 2022-09-14 | 2022-11-29 | 中国石油大学(北京) | Single-pile-suction bucket wind power foundation and recovery method thereof |
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