Hoisting Method for Large Suction Bucket Jacket

Abstract

The present invention relates to the field of ocean engineering technology, and specifically discloses a hoisting method for a large suction bucket jacket. When hoisting the jacket, a crane ship and a semi-submersible ship cooperate in the operation. The buoyancy generated during the sinking process of the suction bucket jacket is utilized to ensure the controllable sinking of the jacket. During this process, only a relatively small lifting force needs to be provided by the crane ship to successfully sink the suction bucket jacket to the seabed. The entire process does not require an increase in the lifting force provided by the crane ship. The cooperation plan of the crane ship and the semi-submersible ship provides a new method for the hoisting construction of the large suction bucket jacket, and the crane ship and the semi-submersible ship applicable to this method are relatively easy to obtain. During the operation window period, the hoisting construction volume can be greatly increased, and the situation of construction period delay can be effectively avoided. At the same time, since this method cleverly utilizes the structure of the suction bucket jacket and does not introduce additional floating structures, the efficiency of the hoisting operation is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ocean engineering, and particularly relates to a hoisting method for a large suction bucket jacket foundation. Background Art

[0002] In the field of offshore wind power generation, suction bucket jacket foundations are widely used due to their characteristics of being applicable to various water depths, short construction periods, convenient recovery, energy conservation and environmental protection. In traditional construction methods, a deck transportation barge is generally used to transport the suction bucket jacket foundation to the wind farm, and then a large floating crane ship is used for hoisting construction of the suction bucket jacket foundation. This method is mature and stable. At present, due to the gradual development of the domestic offshore wind power development and construction towards deeper water and larger scale, the size and weight of the suction bucket jacket foundation are increasing. The weight of the suction bucket jacket foundation is generally above 1500 tons, which puts higher requirements on the construction capacity of large floating crane ships. However, there are few floating crane ships that meet the construction capacity requirements in China at present. The annual available working windows for offshore construction are short, and there are rush installation tides in various sea areas and it is difficult to coordinate, resulting in construction delays. There is a hoisting operation method using a floating body to achieve offshore hoisting provided in the prior art, but this method requires a series of operations on the floating body before and after the hoisting operation, increasing the operation time and making it difficult to meet the requirements of efficient hoisting operation of the suction bucket jacket foundation. Summary of the Invention

[0003] The purpose of the present invention is to provide a hoisting method for a large suction bucket jacket foundation to solve the problem that the existing operation methods do not meet the requirements of efficient hoisting operation of the suction bucket jacket foundation.

[0004] The present invention provides a hoisting method for a large suction bucket jacket foundation for hoisting a suction bucket jacket foundation. The suction bucket jacket foundation includes a suction bucket and a jacket. The bottom of the jacket is fixedly connected to the suction bucket. This method uses a crane ship and a semi-submersible ship for hoisting operations, including the following steps:

[0005] S1: Transport the suction bucket jacket foundation to the installation position, and the crane ship hoists the suction bucket jacket foundation;

[0006] S2: The semi-submersible ship sinks, and the suction bucket jacket foundation is in the first sinking state. When the suction bucket jacket foundation is in the first sinking state, the buoyancy provided by the suction bucket gradually increases, and the supporting force of the semi-submersible ship gradually decreases;

[0007] S3: The semi-submersible ship leaves the installation position, the suction bucket exhausts, and the suction bucket jacket foundation is in the second sinking state. When the suction bucket jacket foundation is in the second sinking state, the buoyancy provided by the suction bucket remains unchanged;

[0008] S4: When the preset position of the suction bucket reaches the water surface, the suction bucket stops exhausting air, and the suction bucket jacket is in the third sinking state. When the suction bucket jacket is in the third sinking state, the buoyancy provided by the suction bucket remains unchanged, and the buoyancy provided by the jacket gradually increases;

[0009] S5: When the suction bucket reaches the seabed, the suction bucket exhausts air. After the suction bucket finishes exhausting air, the jacket is in the fourth sinking state. When the suction bucket jacket is in the fourth sinking state, the self-weight of the suction bucket sinks into the mud.

[0010] As an optimal technical solution of the large suction bucket jacket hoisting method, step S1 includes:

[0011] S11: Fix the suction bucket jacket to the deck of the semi-submersible ship;

[0012] S12: Transport the semi-submersible ship to the installation position;

[0013] S13: The crane ship hangs and hoists the suction bucket jacket;

[0014] S14: Release the fixed connection between the suction bucket jacket and the semi-submersible ship.

[0015] As an optimal technical solution of the large suction bucket jacket hoisting method, in step S12, if the semi-submersible ship has power, the semi-submersible ship sails to the installation position. If the semi-submersible ship has no power, the semi-submersible ship is towed to the installation position by a tugboat.

[0016] As an optimal technical solution of the large suction bucket jacket hoisting method, step S2 includes:

[0017] S21: The semi-submersible ship sinks, and the suction bucket jacket is in the first sinking state;

[0018] S22: If the sum of the buoyancy of the suction bucket and the lifting force of the crane ship is less than the gravity of the suction bucket jacket, the semi-submersible ship continues to sink.

[0019] As an optimal technical solution of the large suction bucket jacket hoisting method, step S3 includes:

[0020] S31: If the sum of the buoyancy of the suction bucket and the lifting force of the lifting ship is equal to the gravity of the suction bucket jacket, the semi-submersible ship leaves the installation position;

[0021] S32: The suction bucket exhausts air, and the suction bucket jacket is in the second sinking state.

[0022] As an optimal technical solution of the large suction bucket jacket hoisting method, an electromagnetic valve is provided at the top of the suction bucket. In step S32, the exhaust speed of the suction bucket is controlled by changing the opening degree of the electromagnetic valve.

[0023] As a preferred technical solution of the lifting method for a large suction bucket jacket, step S4 includes:

[0024] S41: If the preset position of the suction bucket reaches the water surface, the suction bucket stops exhausting air.

[0025] S42: The lifting force of the crane ship decreases, and the suction bucket jacket is in the third sinking state.

[0026] As a preferred technical solution of the lifting method for a large suction bucket jacket, let the length from the preset position to the top of the suction bucket be a, and let the length from the bottom to the top of the suction bucket be b. Then the ratio of b to a is greater than or equal to 5 and less than or equal to 20.

[0027] As a preferred technical solution of the lifting method for a large suction bucket jacket, step S5 includes:

[0028] S51: If the suction bucket reaches the seabed, the suction bucket exhausts air.

[0029] S52: The crane ship removes the lifting force, and the suction bucket jacket is in the fourth sinking state.

[0030] As a preferred technical solution of the lifting method for a large suction bucket jacket, a submersible pump is fixedly installed on the suction bucket. When the suction bucket jacket is in the fourth sinking state, the submersible pump is turned on to sink the suction bucket.

[0031] The beneficial effects of the present invention are:

[0032] The present invention provides a lifting method for a large suction bucket jacket for lifting a suction bucket jacket. The suction bucket jacket includes a suction bucket and a jacket. The bottom of the jacket is fixedly connected to the suction bucket. This method uses a crane ship and a semi-submersible ship for lifting operations, including the following steps:

[0033] S1: Transport the suction bucket jacket to the installation position, and the crane ship lifts the suction bucket jacket.

[0034] S2: The semi-submersible ship sinks, and the suction bucket jacket is in the first sinking state. When the suction bucket jacket is in the first sinking state, the buoyancy provided by the suction bucket gradually increases, and the supporting force of the semi-submersible ship gradually decreases.

[0035] S3: The semi-submersible ship leaves the installation position, the suction bucket exhausts air, and the suction bucket jacket is in the second sinking state. When the suction bucket jacket is in the second sinking state, the buoyancy provided by the suction bucket remains unchanged.

[0036] S4: When the preset position of the suction bucket reaches the water surface, the suction bucket stops exhausting air, and the suction bucket jacket is in the third sinking state. When the suction bucket jacket is in the third sinking state, the buoyancy provided by the suction bucket remains unchanged, and the buoyancy provided by the jacket gradually increases.

[0037] S5: When the suction bucket reaches the seabed, the suction bucket exhausts. After the suction bucket exhausts, the suction bucket jacket is in the fourth sinking state. When the suction bucket jacket is in the fourth sinking state, the self-weight of the suction bucket sinks into the mud.

[0038] When hoisting the suction bucket jacket, the crane ship and the semi-submersible ship cooperate. The buoyancy generated during the sinking process of the suction bucket and the jacket is utilized to ensure the controllable sinking of the suction bucket jacket. During this process, only a small lifting force from the crane ship is required to successfully sink the suction bucket jacket to the seabed. When the suction bucket jacket has not started to sink or is in the initial stage of sinking, the suction bucket does not provide buoyancy or provides less buoyancy. At this stage, the semi-submersible ship provides support for the suction bucket jacket and the crane ship provides a lifting force to prevent the suction bucket jacket from tilting. When the suction bucket jacket sinks to a certain depth, the sum of the buoyancy provided by the suction bucket and the lifting force provided by the crane ship is balanced with the gravity of the suction bucket jacket. At this time, the semi-submersible ship leaves. Subsequently, the suction bucket exhausts, causing the suction bucket jacket to continue to sink. At the same time, the lifting force provided by the crane ship does not need to be increased throughout the process. The cooperation plan of the crane ship and the semi-submersible ship provides a new method for the hoisting construction of the suction bucket jacket, and the crane ship and the semi-submersible ship applicable to this method are relatively easy to obtain. During the operation window period, the hoisting construction volume can be significantly increased, effectively avoiding the situation of construction period delay. At the same time, because this method cleverly utilizes the structure of the suction bucket jacket and does not introduce additional floating structures, the efficiency of the hoisting operation is further improved. Description of the Drawings

[0039] Figure 1 It is a flow chart of the large suction bucket jacket hoisting method in the embodiment of the present invention;

[0040] Figure 2 It is a schematic diagram of the initial state of the suction bucket jacket in the embodiment of the present invention;

[0041] Figure 3 It is a schematic diagram of the first sinking state of the suction bucket jacket in the embodiment of the present invention;

[0042] Figure 4 It is a schematic diagram of the second sinking state of the suction bucket jacket in the embodiment of the present invention;

[0043] Figure 5 It is a schematic diagram of the preset position of the suction bucket in the embodiment of the present invention;

[0044] Figure 6 It is a schematic diagram of the third sinking state of the suction bucket jacket in the embodiment of the present invention;

[0045] Figure 7 It is a schematic diagram of the state after the suction bucket jacket is completed in the embodiment of the present invention.

[0046] In the figure:

[0047] 1. Crane ship;

[0048] 2. Semi-submersible ship;

[0049] 3. Suction bucket; 31. Solenoid valve;

[0050] 4. Jacket;

[0051] 5. Gas;

[0052] 6. Liquid;

[0053] 7. Sediment. Detailed implementation manners

[0054] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0055] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0056] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0057] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0058] In the field of offshore wind power generation, suction bucket jacket foundations are widely used due to their characteristics of being applicable to various water depths, short construction periods, convenient recovery, energy conservation and environmental protection. The traditional construction method generally uses a deck transport barge to transport the suction bucket jacket to the wind farm and then uses a large floating crane ship for the hoisting construction of the suction bucket jacket. This method is mature and stable. At present, due to the gradual development of domestic offshore wind power development and construction towards deeper water and larger scale, the size and weight of the suction bucket jacket are getting larger and larger. The weight of the suction bucket jacket is generally above 1500 tons, which puts higher requirements on the construction capacity of large floating crane ships. However, there are currently few floating crane ships in China that meet the construction capacity requirements. The annual available working windows for offshore construction are short. There are rush installation tides in each sea area and it is difficult to coordinate, resulting in construction delays. There is a method for realizing offshore hoisting using a floating body provided in the prior art, but this method requires a series of operations on the floating body before and after the hoisting operation, increasing the operation time and making it difficult to meet the requirements of efficient hoisting operation of the suction bucket jacket.

[0059] In response to this, this embodiment provides a large suction bucket jacket hoisting method. This large suction bucket jacket hoisting method uses a crane ship 1 and a semi-submersible ship 2 to cooperate in the operation to hoist the suction bucket jacket to solve the problem of low hoisting operation efficiency existing in the prior art.

[0060] As Figures 1 - 7 shown, the present invention provides a large suction bucket jacket hoisting method for hoisting a suction bucket jacket. The suction bucket jacket includes a suction bucket 3 and a jacket 4. The bottom of the jacket 4 is fixedly connected to the suction bucket 3. This method uses a crane ship 1 and a semi-submersible ship 2 for hoisting operations, including the following steps:

[0061] S1: Transport the suction bucket jacket to the installation position, and the crane ship 1 hoists the suction bucket jacket;

[0062] S2: The semi-submersible ship 2 sinks, and the suction bucket jacket is in the first sinking state. When the suction bucket jacket is in the first sinking state, the buoyancy provided by the suction bucket 3 gradually increases, and the supporting force of the semi-submersible ship 2 gradually decreases;

[0063] S3: The semi-submersible ship 2 leaves the installation position, the suction bucket 3 exhausts, and the suction bucket jacket is in the second sinking state. When the suction bucket jacket is in the second sinking state, the buoyancy provided by the suction bucket 3 remains unchanged;

[0064] S4: When the preset position of the suction bucket 3 reaches the water surface, the suction bucket 3 stops exhausting air, and the suction bucket jacket is in the third sinking state. When the suction bucket jacket is in the third sinking state, the buoyancy provided by the suction bucket 3 remains unchanged, and the buoyancy provided by the jacket 4 gradually increases;

[0065] S5: When the suction bucket 3 reaches the seabed, the suction bucket 3 exhausts air. After the suction bucket 3 finishes exhausting air, the suction bucket jacket is in the fourth sinking state. When the suction bucket jacket is in the fourth sinking state, the self-weight of the suction bucket 3 sinks into the mud.

[0066] Specifically, when hoisting the suction bucket jacket, the crane vessel 1 and the semi-submersible vessel 2 cooperate. The buoyancy generated during the sinking process of the suction bucket 3 and the jacket 4 is utilized to ensure the controllable sinking of the suction bucket jacket. During this process, only a relatively small lifting force needs to be provided by the crane vessel 1 to successfully sink the suction bucket jacket to the seabed. When the suction bucket jacket has not started to sink or is in the initial stage of sinking, the suction bucket 3 does not provide buoyancy or provides relatively small buoyancy. At this stage, the semi-submersible vessel 2 provides support for the suction bucket jacket and the crane vessel 1 provides a lifting force to prevent the suction bucket jacket from tilting. When the suction bucket jacket sinks to a certain depth, the sum of the buoyancy provided by the suction bucket 3 and the lifting force provided by the crane vessel 1 is balanced with the gravity of the suction bucket jacket. At this time, the semi-submersible vessel 2 leaves. Subsequently, the suction bucket 3 exhausts air to make the suction bucket jacket continue to sink. The air pressure inside the suction bucket 3 can be changed according to actual needs to adjust the buoyancy, thereby ensuring that the suction bucket jacket can sink at a uniform and controlled speed. At the same time, the lifting force provided by the crane vessel 1 does not need to be increased throughout the process. The cooperation plan of the crane vessel 1 and the semi-submersible vessel 2 provides a new method for the hoisting construction of the suction bucket jacket, and the crane vessel 1 and the semi-submersible vessel 2 applicable to this method are relatively easy to obtain. During the operation window period, the hoisting construction volume can be greatly increased, effectively avoiding the situation of construction period delay. At the same time, because this method cleverly utilizes the structure of the suction bucket jacket and does not introduce additional floating structures, the efficiency of the hoisting operation is further improved.

[0067] Specifically, as Figure 2As shown in the figure, after determining the installation position of the suction bucket jacket, the crane ship 1 is first anchored beside the installation position. The suction bucket jacket is fixed on the deck of the semi-submersible ship 2. The semi-submersible ship 2 is transported to the installation position and anchored after berthing alongside the crane ship 1. If the semi-submersible ship 2 has power, it sails to the installation position; if the semi-submersible ship 2 has no power, it is towed to the installation position by a tugboat. It should be noted that the method of the semi-submersible ship 2 sailing to the predetermined position in the ocean or being towed to the predetermined position by a tugboat is a mature prior art in the field, so it will not be elaborated here. After the semi-submersible ship 2 berths alongside the crane ship 1 and anchors, the hanging sling of the crane ship 1 hangs the suction bucket jacket and releases the fixed connection between the suction bucket jacket and the semi-submersible ship 2. At this time, the gravity of the suction bucket jacket is completely borne by the semi-submersible ship 2 and the crane ship 1, and the suction bucket jacket is in the initial state. In this embodiment, the connection between the suction bucket jacket and the semi-submersible ship 2 can be welding or bolt connection, preferably welding. When releasing the fixed connection between the two, tools such as angle grinders can be used to cut and polish the welding position.

[0068] Furthermore, as Figure 3 shown, in the initial state of the suction bucket jacket, the semi-submersible ship 2 starts to sink and the suction bucket 3 enters the water. The suction bucket 3 in this embodiment is a hollow bucket-shaped structure with an open bottom. When the suction bucket 3 enters the water, the water surface and the inner side wall of the suction bucket 3 jointly form a cavity, and the cavity is filled with gas 5. As the suction bucket 3 continues to sink into the water, under the action of water pressure, liquid 6 enters the cavity, and the gas 5 in the cavity is compressed under the action of water pressure. At this time, the pressure of the gas 5 in the cavity is greater than the external atmospheric pressure. Correspondingly, the water level height in the cavity is lower than the sea level height, that is, the volume of the liquid 6 displaced by the suction bucket 3 after entering the water is greater than the volume of the liquid 6 entering the suction bucket 3, and the difference between the two is the buoyancy generated by the suction bucket 3.

[0069] It can be understood that as the suction bucket 3 sinks, the difference between the volume of the liquid 6 displaced by the suction bucket 3 and the volume of the liquid 6 entering the suction bucket 3 gradually increases. That is, the buoyancy provided during the sinking process of the suction bucket 3 gradually increases. When the sum of the buoyancy provided by the suction bucket 3 and the lifting force of the crane ship 1 is less than the gravity of the suction bucket jacket, the semi-submersible ship 2 continues to support the suction bucket 3, and the semi-submersible ship 2 continues to sink. At this time, the suction bucket jacket is in the first sinking state. The suction bucket 3 sinks with the semi-submersible ship 2. When the sum of the buoyancy of the suction bucket 3 and the lifting force of the lifting ship is equal to the gravity of the suction bucket jacket, the semi-submersible ship 2 does not need to support the suction bucket 3. At this time, the semi-submersible ship 2 can leave the installation position from one side.

[0070] Optionally, for the case where the suction bucket 3 is small and the buoyancy it can provide is limited. After the bottom of the suction bucket 3 enters the water, the inside of the suction bucket 3 can be inflated and pressurized to further strengthen the difference between the volume of the liquid 6 displaced by the suction bucket 3 and the volume of the liquid 6 entering the suction bucket 3, thereby increasing the buoyancy that the suction bucket 3 can provide and enabling it to meet the usage requirements.

[0071] Furthermore, as Figure 4 shown, after the semi-submersible ship 2 leaves the installation position, the sum of the buoyancy of the suction bucket 3 and the lifting force of the lifting ship is equal to the gravity of the suction bucket jacket. The suction bucket 3 no longer has a tendency to continue sinking. Control the suction bucket 3 to exhaust air to reduce the air pressure inside the suction bucket 3, allowing more liquid 6 to enter the suction bucket 3. At this moment, the buoyancy that the suction bucket 3 can provide decreases, while the lifting force of the crane ship 1 remains unchanged, and the semi-submersible ship 2 has left the installation position and cannot support the suction bucket 3. Therefore, the suction bucket 3 continues to have a tendency to sink. The suction bucket 3 continues to sink and continues to exhaust air so that the suction bucket 3 always has a tendency to sink. At this time, the suction bucket jacket is in the second state. It can be understood that the sinking speed of the suction bucket 3 is achieved by controlling the air exhaust speed of the suction bucket 3. Specifically, if the air exhaust speed of the suction bucket 3 is fast, the sinking speed of the suction bucket 3 is fast, and vice versa. Those skilled in the art can determine the sinking speed of the suction bucket 3 according to the actual project, and then calculate the air exhaust speed of the suction bucket 3 using existing formulas. The relevant calculation methods belong to the existing technology in this field and are not the improvement points of the present invention. Those skilled in the art can calculate according to the specific conditions of the construction site.

[0072] Optionally, one or more solenoid valves 31 are provided at the top of the suction bucket 3 in this embodiment. The air exhaust speed of the suction bucket 3 is controlled by changing the opening degree of one or more solenoid valves 31. When the suction bucket 3 sinks, the hook of the crane ship 1 is lowered accordingly while keeping the lifting force unchanged to avoid abnormal postures such as tilting of the suction bucket jacket. The air exhaust speed of the suction bucket 3 is controlled by controlling the opening degree of the solenoid valve 31 to ensure the controllable sinking of the suction bucket jacket. As the existing technology in this field, the method for remotely controlling the solenoid valve 31 and related structures will not be elaborated here.

[0073] Still further, as Figures 5 - 6As shown, as the preset position of the suction bucket 3 reaches the water surface, the suction bucket 3 stops exhausting air. It can be understood that if the suction bucket 3 does not stop exhausting air when its preset position reaches the water surface, then after the suction bucket 3 is completely submerged in water, there will no longer be gas 5 inside the suction bucket 3, resulting in a reduction in the buoyancy provided by the suction bucket 3. At this time, the crane ship 1 needs to correspondingly increase the lifting force to maintain the controlled sinking of the suction bucket jacket, and correspondingly, a crane ship 1 with a higher lifting capacity is required for operation, resulting in a reduction in the number of available crane ships 1. If the lifting force of the crane ship 1 is not increased, the suction bucket jacket will quickly sink a certain distance, and during this process, the risk of the suction bucket jacket having a poor attitude is relatively high. Therefore, when the suction bucket 3 is about to be completely submerged in water, the suction bucket 3 stops exhausting air, so that there is still a certain volume of gas 5 inside the suction bucket 3 after the suction bucket 3 is completely submerged in the water surface, and correspondingly, the suction bucket 3 can provide a part of the buoyancy. At this time, the suction bucket jacket no longer has a tendency to continue sinking. At this time, the lifting force of the crane ship 1 is reduced, so that the suction bucket jacket continues to have a tendency to sink, and the suction bucket jacket is in the third sinking state. The sinking speed of the suction bucket jacket can be determined by the degree of reduction of the lifting force of the crane ship 1, so that the entire process of the sinking of the suction bucket jacket is controllable and there is no need to use a crane ship 1 with a higher lifting capacity for operation, improving the applicable range of this solution. When the suction bucket jacket is in the third sinking state, the jacket 4 enters the water and provides a part of the buoyancy. Correspondingly, the lifting force of the crane ship 1 continues to decrease, and the reduced lifting force of the crane ship 1 is equal to the buoyancy provided by the jacket 4, so as to realize that the suction bucket jacket can sink controllably and evenly. Similarly, to avoid the situation of abnormal attitude of the suction bucket jacket, the lifting force of the crane ship 1 decreases but is not zero during the sinking process of the suction bucket jacket.

[0074] Optionally, in order to ensure that the lifting force of the crane ship 1 does not decrease to zero during the sinking process of the suction bucket jacket. Those skilled in the art can achieve this by adjusting the preset position of the suction bucket 3. Specifically, let the length of the preset position from the top of the suction bucket 3 be a, and the length from the bottom to the top of the suction bucket 3 be b. Then, the larger the ratio of b to a, the closer the preset position is to the top of the suction bucket 3. When the suction bucket jacket is in the third sinking state, the volume of gas 5 inside the suction bucket 3 is smaller, and the rate of decrease of the lifting force of the crane ship 1 is slower. The smaller the ratio of b to a, the farther the preset position is from the top of the suction bucket 3. When the suction bucket jacket is in the third sinking state, the volume of gas 5 inside the suction bucket 3 is larger, and the rate of decrease of the lifting force of the crane ship 1 is faster. In this embodiment, the ratio of b to a can be 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20. In order to ensure that the lifting force of the crane ship 1 is not zero when the suction bucket jacket is in the third sinking state, so as to ensure the stable sinking attitude of the suction bucket jacket, in this embodiment, the ratio of b to a is preferably 20.

[0075] Furthermore, asFigure 7 As shown, the suction bucket jacket continues to sink in the third sinking state, and the lifting force of the crane vessel 1 continuously decreases. When the suction bucket 3 reaches the seabed, the suction bucket 3 discharges air, causing the liquid 6 to fill the inside of the suction bucket 3. After confirming that the attitude of the suction bucket jacket is normal, the crane vessel 1 removes the lifting force. Under the action of the self-weight of the suction bucket jacket, a part of the suction bucket 3 sinks into the sediment 7 on the seabed. At this time, the suction bucket jacket is in the fourth sinking state. On the basis of the fourth sinking state, the submersible pump fixedly installed on the suction bucket 3 is started for penetration. The submersible pump pumps out the sediment 7 and the liquid 6 in the suction bucket 3 from the suction bucket 3. Under the action of negative pressure, the suction bucket 3 further sinks into the sediment 7 until it sinks to the required depth to complete the operation. In the art, the method and related structure for controlling the submersible pump to penetrate the suction bucket 3 are all prior arts, so they will not be elaborated here.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A hoisting method for a large suction bucket jacket, used for hoisting a suction bucket jacket, the suction bucket jacket comprising a suction bucket (3) and a jacket (4), the jacket (4) being fixedly connected to the bottom of the suction bucket (3), characterized in that, Lifting operations are carried out using a crane vessel (1) and a semi-submersible vessel (2), including the following steps: S1: The semi-submersible vessel (2) transports the suction bucket jacket to the installation position, and the crane vessel (1) hoists the suction bucket jacket; S2: The semi-submersible vessel (2) sinks, and the suction bucket jacket is in the first sinking state. When the suction bucket jacket is in the first sinking state, the buoyancy provided by the suction bucket (3) gradually increases, and the supporting force of the semi-submersible vessel (2) gradually decreases; S3: The semi-submersible vessel (2) leaves the installation position, the suction bucket (3) exhausts, and the suction bucket jacket is in the second sinking state. When the suction bucket jacket is in the second sinking state, the buoyancy provided by the suction bucket (3) remains unchanged; S4: When the preset position of the suction bucket (3) reaches the water surface, the suction bucket (3) stops exhausting, and the suction bucket jacket is in the third sinking state. When the suction bucket jacket is in the third sinking state, the buoyancy provided by the suction bucket (3) remains unchanged, and the buoyancy provided by the jacket (4) gradually increases; The step S4 includes: S41: If the preset position of the suction bucket (3) reaches the water surface, the suction bucket (3) stops exhausting; S42: The lifting force of the crane vessel (1) decreases, and the suction bucket jacket is in the third sinking state; S5: When the suction bucket (3) reaches the seabed, the suction bucket (3) exhausts. After the suction bucket (3) finishes exhausting, the suction bucket jacket is in the fourth sinking state. When the suction bucket jacket is in the fourth sinking state, the suction bucket (3) self-embeds into the mud.

2. The hoisting method for a large suction bucket jacket according to claim 1, characterized in that, The step S1 includes: S11: Fix the suction bucket jacket to the deck of the semi-submersible vessel (2); S12: Transport the semi-submersible vessel (2) to the installation position; S13: The crane vessel (1) hangs and hoists the suction bucket jacket; S14: Release the fixed connection between the suction bucket jacket and the semi-submersible vessel (2).

3. The hoisting method for a large suction bucket jacket according to claim 2, characterized in that, In the step S12, if the semi-submersible vessel (2) has power, the semi-submersible vessel (2) sails to the installation position. If the semi-submersible vessel (2) has no power, the semi-submersible vessel (2) is towed to the installation position by a tugboat.

4. The hoisting method for a large suction bucket jacket according to claim 1, characterized in that, The step S2 includes: S21: The semi-submersible vessel (2) sinks, and the suction bucket jacket is in the first sinking state; S22: If the sum of the buoyancy of the suction bucket (3) and the lifting force of the crane vessel (1) is less than the gravity of the suction bucket jacket, the semi-submersible vessel (2) continues to sink.

5. The hoisting method for a large suction bucket jacket according to claim 4, characterized in that, The step S3 includes: S31: If the sum of the buoyancy of the suction bucket (3) and the lifting force of the crane vessel (1) is equal to the gravity of the suction bucket jacket, the semi-submersible vessel (2) leaves the installation position; S32: The suction bucket (3) exhausts, and the suction bucket jacket is in the second sinking state.

6. The hoisting method for a large suction bucket jacket according to claim 5, characterized in that, A solenoid valve (31) is provided at the top of the suction bucket (3). In the step S32, the exhaust speed of the suction bucket (3) is controlled by changing the opening degree of the solenoid valve (31).

7. The hoisting method for a large suction bucket jacket according to claim 1, characterized in that, Let the length from the preset position to the top of the suction bucket (3) be a, and let the length from the bottom to the top of the suction bucket (3) be b. Then the ratio of b to a is greater than or equal to 5 and less than or equal to 20.

8. The hoisting method for a large suction bucket jacket according to claim 1, characterized in that, The step S5 includes: S51: If the suction bucket (3) reaches the seabed, the suction bucket (3) discharges air. S52: The lifting ship (1) removes the lifting force, and the suction bucket jacket is in the fourth sinking state.

9. The large suction bucket jacket lifting method according to claim 8, characterized in that, The suction bucket (3) is fixedly provided with a submersible pump. When the suction bucket jacket is in the fourth sinking state, the submersible pump is turned on to sink the suction bucket (3).

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