CN113463679B - Offshore wind power multi-cylinder jacket foundation installation and recovery method - Google Patents
Offshore wind power multi-cylinder jacket foundation installation and recovery method Download PDFInfo
- Publication number
- CN113463679B CN113463679B CN202110666707.6A CN202110666707A CN113463679B CN 113463679 B CN113463679 B CN 113463679B CN 202110666707 A CN202110666707 A CN 202110666707A CN 113463679 B CN113463679 B CN 113463679B
- Authority
- CN
- China
- Prior art keywords
- suction
- cylinder
- jacket foundation
- tube
- installation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D11/00—Methods or apparatus specially adapted for both placing and removing sheet pile bulkheads, piles, or mould-pipes
-
- 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
- E02D27/44—Foundations for machines, engines or ordnance
-
- 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
- E02D27/52—Submerged foundations, i.e. submerged in open water
- E02D27/525—Submerged foundations, i.e. submerged in open water using elements penetrating the underwater ground
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Wind Motors (AREA)
Abstract
The invention belongs to the technical field of offshore wind power construction, and discloses an installation and recovery method of an offshore wind power multi-cylinder jacket foundation, which is characterized in that after a plurality of multi-cylinder jacket foundations are transported to an installation sea area by an integrated transport and installation ship, the plurality of multi-cylinder jacket foundations are directly installed and/or recovered by the integrated transport and installation ship, each suction cylinder of the multi-cylinder jacket foundations is provided with an independent suspension cable, and the lowering and/or jacking speed of the multi-cylinder jacket foundations is controlled; the suction tube is kept in a gas-retaining state in the process of sinking and/or recovering the multi-tube jacket foundation, certain buoyancy is provided for the multi-tube jacket foundation, and the tension of each hanging cable can be controlled by inflating or deflating the suction tube to adjust the buoyancy, so that the tension of the hanging cables is always controlled within a certain safety range. Therefore, the invention does not need large hoisting equipment such as a crane and the like, shortens the offshore construction operation time, reduces the offshore construction operation cost, and ensures the safety and stability of the installation and recovery process.
Description
Technical Field
The invention belongs to the technical field of offshore wind power construction, and particularly relates to an installation and recovery method of an offshore wind power multi-cylinder jacket foundation.
Background
At present in marine wind power generation field, many tube jacket foundations have light in weight as a neotype offshore wind turbine foundation, and structural strength is high, and bearing capacity is strong, receives the wave current effect less, and the construction is simple and convenient, advantages such as recoverable.
In the traditional installation method, the foundation structure and the upper fan are transported to an installation place and then are installed step by step, and the installation mode has long offshore construction operation time and is greatly influenced by natural conditions such as weather, sea conditions and the like, so that the construction difficulty is high; meanwhile, large-scale hoisting equipment such as cranes and the like are required for step-by-step installation, the requirement on the bearing capacity of the transport ship is high, and the installation cost is increased due to the use of the hoisting equipment. In addition, the tension of the cable in the process of lowering the multi-jacket foundation is also a problem needing important attention, and if the tension of the suspension cable cannot be controlled constantly, the tension of the suspension cable is too large to exceed the strength of the suspension cable, so that cable rope breakage is caused, or the tension of the suspension cable is too small to cause unhooking, so that engineering accidents are caused; in addition, due to geological differences, the traditional suction barrel is prone to being not sunk in the sinking process, and meanwhile, the buckling problem of the barrel body needs to be noticed.
When a multi-cylinder jacket foundation is recycled, the overall size and weight of the multi-cylinder jacket foundation are large, and the required hoisting height is high, so that the requirement on a hoisting cable is high, the difficulty of floating crane operation is high, and if the tension of the hoisting cable is controlled, safety accidents such as cable rope breakage or unhooking are easy to happen.
Disclosure of Invention
The invention aims to solve the technical problems in the installation and recovery of an offshore wind power multi-cylinder jacket foundation, and provides an installation and recovery method of the offshore wind power multi-cylinder jacket foundation, which does not need large hoisting equipment such as a crane and the like, shortens the offshore construction operation time, reduces the offshore construction operation cost, and ensures the safety and stability of the installation and recovery process.
In order to solve the technical problems, the invention is realized by the following technical scheme:
according to one aspect of the invention, an installation method of a multi-cylinder jacket foundation of offshore wind power is provided, wherein the multi-cylinder jacket foundation is installed through an integrated transport installation ship; each multi-cylinder jacket foundation is provided with suspension cables, the number of the suspension cables is the same as that of the suction cylinders, the top of each suspension cable is connected to a winch, and the winch is installed above the multi-cylinder jacket foundation through a support frame of the integrated transport and installation ship;
and is carried out according to the following steps;
(1) adjusting the draft of an integral structure formed by the integrated transport and installation ship and a plurality of multi-tube jacket foundations according to the environmental conditions of the installation positions of the multi-tube jacket foundations; disconnecting the multi-tube jacket foundation to be installed from the integrated transport and installation vessel;
(2) deflating each suction tube of the multi-tube jacket foundation to be installed through an air valve, exhausting and sinking the multi-tube jacket foundation, and controlling the length of the suspension cable to be matched with the multi-tube jacket foundation to be lowered by the winch;
(3) after the multi-cylinder jacket foundation exhausts air and sinks to the top cover of the suction cylinder to reach the water surface, the suction cylinder is inflated through the air valve until the tension of the suspension cable is 10% -30% of the gravity of the multi-cylinder jacket foundation;
(4) closing the air valve, stopping inflating the suction cylinder, and continuing to sink the multi-cylinder jacket foundation;
(5) when the multi-cylinder jacket foundation sinks to the mud surface, the air valve inflates the suction cylinder to empty water in the suction cylinder, and air flow generated by inflation can flush and disperse mud soft soil on the surface layer of the mud surface;
(6) when the sludge soft soil on the surface layer of the mud surface is basically broken, stopping inflating the suction cylinder, keeping the open state of the air valve, and continuously sinking the multi-cylinder jacket foundation to enter the mud surface;
(7) and after the multi-tube jacket foundation does not sink continuously, the connection between the suspension cable and the multi-tube jacket foundation is firstly detached, then the suction tube is pumped through the air valve, and water is pumped after the air pumping is finished, so that the multi-tube jacket foundation sinks under the suction force.
(8) And after the installation is in place, the suction cylinder is continuously pumped, and the foundation is reinforced.
Further, in the step (2), the tension of the hoist cable is controlled to be 20% -80% of the maximum design tension.
Further, in the step (4), the lowering speed of the multi-cylinder jacket foundation is controlled to be 0.5-1.5m/h by the hoisting cable;
and when the tension of the suspension cable reaches the maximum design tension, the air valve is used for inflating the suction cylinder so as to reduce the tension of the suspension cable.
Further, in the step (5), the distance between the bottom end of the suction barrel and the mud surface to be contacted with the mud surface is 0.5-1.0 m.
Further, in the step (7), if a hard soil layer exists at the installation position of the suction tube, when the suction force for pumping air or pumping water exceeds the maximum designed suction force, stopping pumping air or pumping water to the suction tube, instead, pumping air after pumping water to the suction tube firstly, jacking the suction tube to the bottom end of the suction tube to leave the mud surface, then pumping air and pumping water to the suction tube firstly, and sinking, so that the suction tube and the suction tube are sunk in place by repeatedly sinking;
if the installation position of the suction barrel has the boulder, the suction barrel is firstly pumped with water and then pumped with air to jack the suction barrel to be away from the mud surface, then the installation position of the suction barrel is adjusted, and the suction is continued to sink after the boulder is avoided.
If the suction tube is internally retained with the gas in the tube which can not be discharged by air suction, the gas in the tube is discharged by reversely pumping water.
Furthermore, the multi-cylinder jacket foundation is connected with a fan through a tower cylinder, and the wind power integration of the multi-cylinder jacket foundation is installed through an integrated transportation and installation ship.
According to another aspect of the invention, a method for recovering a multi-cylinder jacket foundation of offshore wind power is provided, wherein the multi-cylinder jacket foundation is recovered by an integrated transport and installation ship; each multi-cylinder jacket foundation is provided with a suspension cable, the number of the suspension cables is the same as that of the suction cylinders, the top of each suspension cable is connected to a winch, and the winch is installed above the multi-cylinder jacket foundation through a support frame of the integrated transport and installation ship;
and is carried out according to the following steps;
(1) connecting the hoisting cable with the multi-cylinder jacket foundation to be recovered, and controlling the length of the hoisting cable by using the winch, so that the initial tension of the hoisting cable reaches 10-30% of the gravity of the multi-cylinder jacket foundation;
(2) pumping water into a suction cylinder of the multi-cylinder jacket foundation, and pumping air into the suction cylinder through an air valve to lift the suction cylinder, wherein the ratio of pumping water and pumping air is controlled according to the designed water-air ratio of the suction cylinder;
(3) after the suction barrel is jacked to the bottom end and completely goes out of the mud surface, the tension of the hoisting cable is adjusted to be 10% -30% of the self weight of the multi-barrel jacket foundation by adjusting the water-gas ratio of the suction barrel, and then the hoisting cable is controlled by the winch to hoist the multi-barrel jacket foundation;
(4) and when the hoisting cable lifts the multi-cylinder jacket foundation to the designed draft of floating transportation, stopping continuously lifting the hoisting cable, inflating the suction cylinder through the air valve to adjust the water-air ratio inside the suction cylinder until the tension of the hoisting cable is zero, so that the multi-cylinder jacket foundation realizes self-floating at the designed draft, and assembling the multi-cylinder jacket foundation on the integrated transportation and installation ship.
Further, in the step (3), the hoisting speed of the hoisting cable is 0.5-2 m/s;
when the hoist cable tension reaches a minimum design tension, the suction tube is deflated through the air valve to increase the hoist cable tension.
Further, in step (4), when the tension of the suspension cable reaches the maximum design tension, the suction cylinder is inflated through the air valve to reduce the tension of the suspension cable.
Furthermore, the multi-cylinder jacket foundation is connected with a fan through a tower cylinder, and the wind power integration of the multi-cylinder jacket foundation is recovered through an integrated transportation and installation ship.
The invention has the beneficial effects that:
according to the method for installing and recovering the offshore wind power multi-cylinder jacket foundation, the control over the hoisting cable is realized through the winch, the use of large-scale hoisting equipment is reduced in the installation process and/or the recovery process of the multi-cylinder jacket foundation, the cost is saved, and the bearing requirement on a transport installation ship is also reduced.
According to the method for installing and recovering the offshore wind power multi-cylinder jacket foundation, gas is always stored in the suction cylinder in the sinking process and/or the jacking process, certain buoyancy is provided for the multi-cylinder jacket foundation, and the stability of the multi-cylinder jacket foundation is improved under wave current load; and can adjust the hoist cable tension through controlling the inside gas of a suction section of thick bamboo: when the tension of the suspension cable reaches the minimum design tension, the buoyancy of the suction cylinder is reduced by exhausting air to the suction cylinder so as to improve the tension of the suspension cable; when the tension of the suspension cable reaches the maximum design tension, the buoyancy of the suction cylinder is increased by inflating the suction cylinder so as to reduce the tension of the suspension cable; therefore, the tension of the suspension cable is always controlled to be kept in a safe range, and the safety of installation and recovery is improved;
and thirdly, when the bottom end of the suction cylinder is about to contact with the mud surface, the air valve is opened to pump air into the suction cylinder, and water in the suction cylinder is emptied, so that the air flow can disperse the soft mud soil on the surface layer of the mud surface, the suction cylinder can sink in the next step, and the bearing capacity of the foundation is improved.
Drawings
FIG. 1 is a schematic diagram of a method for installing and recovering a foundation of an offshore wind power multi-barrel jacket provided in embodiment 1;
FIG. 2 is a schematic view showing a sinking process of a suction tube in the construction method according to example 1;
FIG. 3 is a schematic view showing air-pumping and water-discharging before the suction tube contacts the mud surface in the construction method provided in example 1;
fig. 4 is a schematic view of a complete machine installation and recovery method of an offshore wind power multi-barrel jacket foundation provided in embodiment 2.
In the above figures: 1. a jacket; 2. a suction drum; 3. a winch fixing platform; 4. a winch; 5. hoisting cables; 6. an integrated transport and installation vessel; 7. a support platform; 8. a support frame; 9. connecting blocks; 10. gas in the cylinder; 11. water; 12. mud surface; 13. sludge soft soil on the surface layer of the mud surface; 14. and (4) air flow.
Detailed Description
For further understanding of the contents, features and effects of the present invention, the following embodiments will be exemplified and explained in detail with reference to the accompanying drawings:
example 1
The invention provides a method for installing and recovering a multi-cylinder jacket foundation of offshore wind power, which comprises the steps of utilizing an integrated transport and installation ship 6 to transport the multi-cylinder jacket foundation to an installation sea area, directly installing and/or recovering the multi-cylinder jacket foundation through the integrated transport and installation ship 6, wherein each suction cylinder 2 of the multi-cylinder jacket foundation is provided with an independent suspension cable 5, and the lowering and/or jacking speed of the multi-cylinder jacket foundation is controlled; the multi-cylinder jacket foundation sinks and/or the suction cylinder 2 is kept in a gas-building state in the recovery process, certain buoyancy is provided for the multi-cylinder jacket foundation, the buoyancy can be adjusted through inflating or deflating the suction cylinder 2, and then the tension of each suspension cable 5 is controlled, so that the tension of the suspension cables 5 is always controlled within a certain safety range, and the safety and stability of the multi-cylinder jacket foundation installation and/or the recovery process are guaranteed.
As shown in fig. 1, the integrated transport and installation vessel 6 is typically provided with a multi-jacket foundation in an amount of 3-6. When the number is even, the multi-tube jacket base is preferably symmetrically distributed on two sides of the integrated transport and installation ship 6. When the number is singular, the multi-cylinder jacket foundation is preferentially arranged in the middle of two sides of the integrated transport and installation ship 6, and the multi-cylinder jacket foundation is preferably arranged towards the end parts of two sides of the integrated transport and installation ship 6 in sequence.
The multi-tube jacket foundation generally comprises three to four suction tubes 2, and a plurality of the suction tubes 2 are connected with the jacket 1 through tube top reinforced sections above the suction tubes. The main body of the suction tube 2 is a steel tube and is composed of a tube wall and a cover plate, and the cover plate is provided with an air valve, a water suction pump, a water pump and a circuit pore channel. The jacket 1 is formed by welding a space truss and a transition section, the bottom of an upright post of the space truss is connected to the center of the top of the suction cylinder 2, and the transition section is used for being connected with a tower cylinder. The multi-tube jacket foundation structure is high in 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 top of each multi-cylinder jacket foundation is hoisted by a hoisting cable 5, the number of the hoisting cables 5 used by each multi-cylinder jacket foundation is the same as that of the suction cylinders 2, the top of each hoisting cable 5 is connected to a winch 4, and the bottom of each hoisting cable 5 is connected to the edge of the transition section of the jacket 1.
Be fixed with supporting platform 7 on the deck of integral type transportation installation ship 6, install support frame 8 on supporting platform 7, the connecting block 9 is stretched out to 8 both sides of support frame outward, and connecting block 9 is used for being connected to support frame 8 with hoist engine fixed station 3, and the quantity of hoist engine fixed station 3 is the same with many tubs jacket basis quantity. Each winch fixing platform 3 corresponds to the upper part of each multi-barrel jacket foundation, a plurality of winches 4 are installed on each winch fixing platform 3, the number of the winches 4 is the same as that of the suction barrels 2, and each winch 4 corresponds to one hanging cable 5. So, many barrels of jacket foundations are vertically hung through hoist cable 5 and are found, hoist cable 5's length is controlled by hoist engine 4, with a section of thick bamboo in gaseous 10 cooperation, carry out sinking and jacking of many barrels of jacket foundations, hoist engine 4's use has saved large-scale hoisting equipment such as loop wheel machine, the requirement of bearing the weight of to the transportation installation ship has been reduced, and utilize the mode control hoist cable 5 tension of the inside aqueous vapor ratio of adjustment suction section of thick bamboo 2, guarantee that hoist cable 5 tension is in safety range all the time, the method is simple and practical, simultaneously on the whole greatly reduced installation cost.
As shown in fig. 2, the method for installing the offshore wind power multi-barrel jacket foundation specifically comprises the following steps:
(1) and adjusting the draft of the integral structure formed by the integrated transport and installation ship 6 and the multiple multi-tube jacket foundations according to the environmental conditions of the installation positions of the multi-tube jacket foundations. If the water depth of the installation position of the multi-tube jacket foundation is shallow, the gravity center of the whole structure can be raised in a mode of inflating all the suction tubes 2 of the multi-tube jacket foundation, and the buoyancy of the multi-tube jacket foundation is increased. If the storm wave of the installation sea area is large, the gravity center of the whole structure can be reduced and the stability of the multi-cylinder jacket foundation can be improved by the mode of discharging air to each suction cylinder 2 of the multi-cylinder jacket foundation.
And closing air valves and water pumps of all the suction cylinders 2 of the multi-cylinder jacket foundation, and disconnecting all the connections between the multi-cylinder jacket foundation to be installed and the integrated transport and installation ship 6.
(2) Each suction tube 2 of the multi-tube jacket foundation is deflated, so that the multi-tube jacket foundation is exhausted and sinks, meanwhile, the winch 4 controls the length of the suspension cable 5 to be cooperatively released, the tension of the suspension cable 5 is always controlled to be 20% -80% of the maximum design tension, and the suspension cable 5 is prevented from being broken or unhooked.
(3) After the multi-cylinder jacket foundation is exhausted and sinks to the top cover of the suction cylinder to reach the water surface, each suction cylinder 2 of the multi-cylinder jacket foundation is inflated until the tension of the suspension cable 5 is adjusted to be 10% -30% of the gravity of the multi-cylinder jacket foundation, so that the suspension cable 5 can be always kept in tension after the suction cylinder 2 enters the water surface, and unhooking caused by relaxation of the tension of the suspension cable 5 is avoided.
(4) And closing the air valve, stopping inflating each suction tube 2 of the multi-tube jacket foundation, and continuing to sink the multi-tube jacket foundation.
And (5) controlling the lowering speed of the multi-cylinder jacket foundation in the step (4) within the range of 0.5-1.5m/h by using the hanging cable 5, and ensuring the safety and stability of the lowering process of the multi-cylinder jacket foundation.
In the sinking process of the step (4), as the gas 10 in the barrel is continuously compressed, the buoyancy of the suction barrel 2 is gradually reduced, the tension of the suspension cable 5 is gradually increased, when the tension of the suspension cable 5 reaches the maximum design tension, the suction barrel 2 needs to be inflated to increase the buoyancy of the suction barrel 2, reduce the tension of the suspension cable 5, prevent the fracture phenomenon caused by the overlarge tension of the suspension cable 5, and ensure the safety of the suspension cable 5.
(5) When the multi-tube jacket foundation is sunk to be in contact with the mud surface 12, each suction tube 2 of the multi-tube jacket foundation is inflated to empty water 11 in each suction tube 2, and the mud surface layer silt soft soil 13 can be dispersed by the airflow 14 generated by inflation, so that the multi-tube jacket foundation in the next step can be sunk more favorably, and the bearing capacity of the foundation is improved, as shown in fig. 3.
Wherein, the distance between the bottom end of the suction tube 2 and the mud surface 12, which is about to contact the mud surface 12, is 0.5-1.0 m.
(6) When the mud surface 12 does not change obviously due to the airflow 14, namely the mud surface layer silt soft soil 13 is basically broken away, the air inflation of each suction tube 2 of the multi-tube jacket foundation is stopped, the air valve is kept in an open state, each suction tube 2 of the multi-tube jacket foundation discharges partial tube gas 10, the interior of each suction tube 2 is restored to a state with water and gas, and the multi-tube jacket foundation continues to sink.
When the bottom end of the suction barrel 2 contacts the mud surface 12 (the air valve is still in an open state), the suction barrel 2 continues to rapidly sink into the mud surface 12 due to the downward driving force of the suction barrel 2 caused by the self weight of the suction barrel 2 and the difference between the internal pressure and the external pressure. In this process, the tension of the hoist cable 5 gradually decreases due to the resistance of the mud surface 12.
(7) When the multi-tube jacket foundation does not sink continuously due to the deflation of the suction tube 2, the connection between the suspension cable 5 and the multi-tube jacket foundation is firstly detached, then the suction tube 2 is pumped through the air valve, and the water is pumped by the water pump after the air pumping is finished, so that the multi-tube jacket foundation sinks under the suction force. And in the suction sinking process, the multi-tube jacket foundation is leveled by adjusting the water pumping flow and the air exhaust flow of each suction tube 2.
In the process of sinking the multi-tube jacket foundation suction, when the installation position of the suction tube 2 meets a hard soil layer or a boulder, continuous air suction and water pumping may cause the tube body of the suction tube 2 to buckle. If a hard soil layer exists at the installation position of the suction barrel 2, when the suction force for pumping air or pumping water exceeds the maximum designed suction force, the suction barrel 2 can be stopped from pumping air or pumping water firstly, the suction barrel 2 is pumped up to the bottom end of the suction barrel to leave the mud surface 12 after being pumped with water firstly, then the suction barrel 2 is pumped out firstly and pumped with water secondly for sinking, and thus the hard soil layer is weakened by repeatedly sinking the suction barrel 2 and jacking the suction barrel 2, and then the hard soil layer is sunk in place. If there is boulder in the 2 mounted positions of a suction section of thick bamboo, then can beat earlier water to a suction section of thick bamboo 2 and inflate afterwards make a suction section of thick bamboo 2 jack-up to leaving mud face 12, then adjust the mounted position of a suction section of thick bamboo 2 through removal section of thick bamboo integral type transportation installation ship 6, continue the suction behind the boulder and sink.
In the suction sinking process, if a small amount of gas 10 in the cylinder is retained inside the suction cylinder 2 and cannot be discharged in an air suction mode, the water suction pump cannot pump water due to the presence of the gas 10 in the retained cylinder, and the retained gas 10 in the cylinder can be discharged by reversely pumping water through the water pumping pump.
(8) After the installation is in place, water is continuously pumped into the suction cylinders 2, and water in the foundation soil generates seepage due to pressure difference, so that the foundation can be reinforced. If the mud surface 12 at the installation position is uneven, the multi-tube jacket foundation can be leveled to a certain extent by pumping water inside each suction tube 2 to generate negative pressure.
And then, the rest of the multi-tube jacket foundations on the integrated transport and installation ship 6 can be respectively transported to other installation sites and sequentially installed according to the method.
The installation sequence of all multi-tube jacket foundations is preferably: firstly, installing a multi-tube jacket foundation close to the bow of the integrated transport and installation ship 6, and then installing a multi-tube jacket foundation close to the stern of the integrated transport and installation ship 6; if the middle part of the integrated transport and installation ship 6 is also provided with a plurality of tube jacket foundations, the plurality of tube jacket foundations at the bow and the stern are sequentially installed, and then the plurality of tube jacket foundations at the middle part are installed; and two multi-tube jacket foundations 1 symmetrically arranged on two sides of the integrated transport and installation ship 6 are installed in an adjacent sequence. This is advantageous in maintaining the stability of the installation vessel and jacket foundation.
After each multi-tube jacket foundation is installed, the draft and attitude of the integrated transport and installation vessel 6 and the integrated structure formed by the multi-tube jacket foundations need to be readjusted.
When the multi-cylinder jacket foundation cannot continuously meet the working requirements, the multi-cylinder jacket foundation needs to be recycled. The method for recovering the foundation of the offshore wind power multi-cylinder jacket specifically comprises the following steps:
(1) the hoisting cable 5 is lowered through the winch 4, and the bottom end of the hoisting cable 5 is connected to the edge of the transition section of the jacket 1. The length of the hoist 4 is used for controlling the length of the hoist cable 5, so that the initial tension of the hoist cable 5 reaches 10% -30% of the gravity of the multi-tube jacket foundation, and the hoist cable 5 is prevented from unhooking.
(2) The suction cylinders 2 of the multi-cylinder jacket foundation are lifted up by a method of firstly pumping water and then pumping air, the water-gas ratio control is designed according to the suction cylinders 2 according to the water-gas ratio control, the buoyancy of the suction cylinders 2 can be increased by maintaining a certain water-gas ratio in the suction cylinders 2, and the tension of the suspension cables 5 is reduced.
(3) After each suction barrel 2 is jacked to the bottom end of the suction barrel 2 to be completely mud-out surface 12, the tension of the suspension cable 5 is adjusted by adjusting the water-air ratio of the suction barrel 2, the tension of the suspension cable 5 is adjusted to be within 10% -30% of the dead weight of the multi-barrel jacket foundation, then the hoisting machine 4 is used for controlling the suspension cable 5 to hoist the multi-barrel jacket foundation, and the hoisting speed of the suspension cable 5 is controlled to be 0.5-2 m/s.
Because hoist cable 5's promotion, the section of thick bamboo internal gas 10 is along with the reduction gradual expansion of water pressure for 2 buoyancy of suction section of thick bamboo increase, hoist cable 5 tension reduces gradually, and when hoist cable 5 tension reached minimum design tension, need reduce buoyancy to the mode of 2 gassing of suction section of thick bamboo, with appropriate increase hoist cable 5 tension, prevent because hoist cable 5 tension undersize leads to unhook danger.
(4) When the lifting cable 5 lifts the multi-cylinder jacket foundation to the design draft of the floating transportation, the lifting cable 5 stops being continuously lifted, the suction cylinder 2 is inflated to adjust the internal water-air ratio until the tension of the lifting cable 5 is zero, so that the multi-cylinder jacket foundation realizes self-floating at the design draft, and the multi-cylinder jacket foundation is assembled on the integrated transportation and installation ship 6.
After the lifting cable 5 lifts a multi-cylinder jacket foundation to the top cover of the suction cylinder 2 to go out of the water surface, the buoyancy is reduced along with the continuous lifting of the suction cylinder 2, the tension of the lifting cable 5 is gradually increased, when the tension of the lifting cable 5 reaches the maximum design tension, the suction cylinder 2 needs to be inflated, so that the buoyancy of the suction cylinder 2 is increased, the tension of the lifting cable 5 is reduced, the phenomenon of fracture caused by the overlarge tension of the lifting cable 5 is prevented, and the safety of the lifting cable 5 is ensured.
The assembly sequence of all multi-tube jacket foundations with the integrated transport and installation vessel 6 is preferably: firstly, installing a multi-cylinder jacket foundation positioned in the middle of the integrated transport and installation ship 6 according to the steps (1) to (4), and then installing the multi-cylinder jacket foundation positioned at the end part of the integrated transport and installation ship 6 according to the steps (1) to (4); and two multi-tube jacket foundations symmetrically arranged on two sides of the integrated transport and installation ship 6 are installed in an adjacent sequence. Therefore, the integral stability of the multi-tube jacket foundation and the integrated transport and installation ship 6 is kept in the assembling process, the assembling time is shortened, and the construction speed is accelerated.
Example 2
As shown in FIG. 4, the multi-jacket foundation and the upper fan are integrally transported to an installation site in a floating mode and then are installed and recovered, and therefore the time of offshore construction operation is greatly shortened. The multi-cylinder jacket foundation wind power complete machine comprises a fan, a tower cylinder and a multi-cylinder jacket foundation which are sequentially connected from top to bottom, the specific steps of installation and recovery are the same as those of embodiment 1, and only the multi-cylinder jacket foundation is replaced by the multi-cylinder jacket foundation wind power complete machine.
If the multi-cylinder jacket foundation comprises three suction cylinders 2, the fan head can be adjusted to the direction of one suction cylinder 2 to form eccentricity when the whole machine is installed, and the water-air ratio of the suction cylinder 2 can be mainly adjusted to level in the sinking process; if the multi-cylinder jacket foundation comprises three suction cylinders 2, the fan head can be adjusted to the middle position of two adjacent suction cylinders 2 to form eccentricity when the whole machine is installed, and the water-air ratio of the two suction cylinders 2 can be adjusted to be leveled in the sinking process.
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 (6)
1. A method for installing a multi-cylinder jacket foundation of offshore wind power is characterized in that the multi-cylinder jacket foundation is installed through an integrated transport installation ship; each multi-cylinder jacket foundation is provided with a suspension cable, the number of the suspension cables is the same as that of the suction cylinders, the top of each suspension cable is connected to a winch, and the winch is installed above the multi-cylinder jacket foundation through a support frame of the integrated transport and installation ship;
and the method comprises the following steps:
(1) adjusting the draft of an integral structure formed by the integrated transport and installation ship and a plurality of multi-tube jacket foundations according to the environmental conditions of the installation positions of the multi-tube jacket foundations; disconnecting the multi-tube jacket foundation to be installed from the integrated transport and installation vessel;
(2) deflating each suction tube of the multi-tube jacket foundation to be installed through an air valve, exhausting and sinking the multi-tube jacket foundation, and controlling the length of the suspension cable to be matched with the multi-tube jacket foundation to be lowered by the winch;
(3) after the multi-cylinder jacket foundation exhausts air and sinks to the top cover of the suction cylinder to reach the water surface, the suction cylinder is inflated through the air valve until the tension of the suspension cable is 10% -30% of the gravity of the multi-cylinder jacket foundation;
(4) closing the air valve, stopping inflating the suction cylinder, and continuing to sink the multi-cylinder jacket foundation;
(5) when the multi-cylinder jacket foundation sinks to the mud surface, the air valve inflates the suction cylinder to empty water in the suction cylinder, and air flow generated by inflation can flush and disperse mud soft soil on the surface layer of the mud surface;
(6) when the sludge soft soil on the surface layer of the mud surface is basically broken, stopping inflating the suction cylinder, keeping the open state of the air valve, and continuously sinking the multi-cylinder jacket foundation to enter the mud surface;
(7) after the multi-cylinder jacket foundation does not sink continuously, the connection between the suspension cable and the multi-cylinder jacket foundation is firstly detached, then the suction cylinder is pumped through the air valve, and water is pumped after the air pumping is finished, so that the multi-cylinder jacket foundation sinks under suction;
(8) and after the installation is in place, the suction cylinder is continuously pumped, and the foundation is reinforced.
2. The method for installing the offshore wind power multi-barrel jacket foundation according to claim 1, wherein in the step (2), the tension of the hoist cable is controlled to be 20-80% of the maximum design tension.
3. The method for installing the offshore wind power multi-jacket foundation according to claim 1, wherein in the step (4), the lowering speed of the multi-jacket foundation is controlled by the hoisting cable to be 0.5-1.5 m/h;
and when the tension of the suspension cable reaches the maximum design tension, the suction cylinder is inflated through the air valve so as to reduce the tension of the suspension cable.
4. The method for installing the offshore wind power multi-barrel jacket foundation according to claim 1, wherein in the step (5), the distance between the bottom end of the suction barrel and the mud surface, which is to be contacted with the mud surface, is 0.5-1.0 m.
5. The offshore wind power multi-cylinder jacket foundation installation method according to claim 1, wherein in the step (7), if a hard soil layer exists at the installation position of the suction cylinder, when the suction force for air suction or water suction exceeds the maximum designed suction force, the air suction or water suction of the suction cylinder is stopped, instead, the suction cylinder is jacked up to the bottom end of the suction cylinder to leave the mud surface by firstly pumping water and then pumping air, and then the suction cylinder is sunk by firstly pumping air and then pumping water, so that the suction cylinder is sunk in place by repeatedly sinking and jacking the suction cylinder;
if the boulder exists at the installation position of the suction tube, the suction tube is firstly pumped with water and then pumped with air to jack the suction tube to be away from the mud surface, then the installation position of the suction tube is adjusted, and the suction force is continued to sink after the boulder is avoided;
if the suction tube is internally retained with the gas in the tube which can not be discharged by air suction, the gas in the tube is discharged by reversely pumping water.
6. The method for installing the offshore wind power multi-cylinder jacket foundation according to any one of claims 1 to 5, wherein the multi-cylinder jacket foundation is connected with a wind turbine through a tower, and the multi-cylinder jacket foundation wind power whole is installed through an integrated transport and installation ship.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110666707.6A CN113463679B (en) | 2021-06-16 | 2021-06-16 | Offshore wind power multi-cylinder jacket foundation installation and recovery method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110666707.6A CN113463679B (en) | 2021-06-16 | 2021-06-16 | Offshore wind power multi-cylinder jacket foundation installation and recovery method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113463679A CN113463679A (en) | 2021-10-01 |
| CN113463679B true CN113463679B (en) | 2022-05-10 |
Family
ID=77870244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110666707.6A Active CN113463679B (en) | 2021-06-16 | 2021-06-16 | Offshore wind power multi-cylinder jacket foundation installation and recovery method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113463679B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114802650B (en) * | 2022-04-28 | 2024-06-11 | 上海华润大东船务工程有限公司 | Precision control process for installing suction barrel type jacket in floating dock |
| CN115583606B (en) * | 2022-08-24 | 2023-08-25 | 中国船舶集团风电发展有限公司 | Shipment and fixing tool for multi-barrel jacket foundation and application method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012021001A1 (en) * | 2012-04-10 | 2013-10-10 | N.Prior Energy Gmbh | Method and device for producing a foundation for offshore wind turbines |
| CN106882334B (en) * | 2017-02-28 | 2018-10-30 | 天津大学 | A kind of offshore wind farm multi-bucket foundation backpack installation ship and its single step construction method |
| CN107542101B (en) * | 2017-09-28 | 2023-06-30 | 天津大学 | Construction method of offshore four-buoy-buoyancy tank combined foundation structure |
| CN108589764A (en) * | 2018-07-02 | 2018-09-28 | 天津大学 | Bucket foundation wind turbine entirety deep water sinking attitude control method |
| CN108951593B (en) * | 2018-07-24 | 2023-12-08 | 中国电建集团华东勘测设计研究院有限公司 | Marine fan installation system and installation method based on four-barrel jacket composite foundation |
| CN110172993A (en) * | 2019-05-07 | 2019-08-27 | 天津大学 | A kind of offshore wind farm bucket foundation recycling construction method |
| CN110172990A (en) * | 2019-05-07 | 2019-08-27 | 天津大学 | A kind of installation of offshore wind farm bucket foundation and recycling construction method |
-
2021
- 2021-06-16 CN CN202110666707.6A patent/CN113463679B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113463679A (en) | 2021-10-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100343454C (en) | Maritime air float hauling and positioning sinking mounting method for soft-foundation box-cylinder type infrastructure | |
| CN113463679B (en) | Offshore wind power multi-cylinder jacket foundation installation and recovery method | |
| US9499240B2 (en) | Floating marine structure | |
| CN107542101B (en) | Construction method of offshore four-buoy-buoyancy tank combined foundation structure | |
| EP2428443B1 (en) | Installation method and recovery method for offshore wind turbine | |
| CN200971492Y (en) | Pile submarine drilling basal disc with suction | |
| CN107653895B (en) | Combined offshore six-buoy buoyancy tank foundation structure and construction method thereof | |
| WO2001034977A1 (en) | Method and system for installing and transporting an offshore wind power station at sea | |
| CN102079477A (en) | Fan holding and lifting device and mobile overwater operation platform | |
| CN107630461B (en) | Combined offshore four-buoy buoyancy tank foundation structure and construction method thereof | |
| KR102632315B1 (en) | Buoys and installation methods for them | |
| CN102322062B (en) | Transportation and installation process of base barrel body of barrel type breakwater | |
| CN113482033B (en) | Eccentric multi-cylinder jacket foundation and wind power complete machine construction method thereof | |
| CN113415724B (en) | Marine wind power multi-barrel jacket foundation splash zone attitude control method | |
| CN1317160C (en) | Self-installed suction anchor | |
| CN113417311A (en) | Offshore wind power multi-cylinder jacket foundation construction method | |
| US2921442A (en) | Submergible barge | |
| CN104960644A (en) | Auxiliary lifting pontoon and method for lifting underwater object by using the same | |
| CN113047253A (en) | Multifunctional self-elevating offshore wind power construction platform | |
| CN110185057A (en) | A kind of tooling and construction method for the lifting staking out of offshore wind farm single-pile foundation steel-pipe pile | |
| CN108674597A (en) | A kind of jack up wind-powered electricity generation mounting platform | |
| TWI834746B (en) | Work platform vessel equipped with crane and method of using the crane | |
| CN201626782U (en) | Amphibious crawler crane | |
| CN109185071B (en) | Offshore wind power deep water one-step installation device and method | |
| CN114439035B (en) | Retractable top cover for offshore suction type foundation and construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |