Static ballasting device and method for assisting suction anchor in sinking

Abstract

The invention discloses a static ballast device and method for assisting a suction anchor in sinking, and belongs to the technical field of offshore suction anchor penetration construction.The static ballast device comprises a static ballast platform, a ballast cavity used for containing a heavy block is formed in the static ballast platform, and the static ballast platform is connected with the suction anchor through a fixing assembly; the levelness of the suction anchor can be changed by adjusting the position of the heavy block in the ballast cavity, and the invention further discloses a static ballast method for assisting the suction anchor in sinking. The static ballast mode is adopted, weights of different shapes and weights can be stacked according to the design requirements in specific projects, it is ensured that the penetration depth of the suction barrel meets the design requirements, and if it is found that the levelness tends to exceed the design allowable limit value or the standard in the specification, the positions of the weights in the ballast cavity are adjusted, so that the penetration depth of the suction barrel is guaranteed. And the levelness of the suction anchor meets design requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore suction anchor penetration construction, and in particular relates to a static ballast device and method for assisting suction anchor sinking. Background Art

[0002] With the accelerated development of marine oil and gas resource exploitation, suction anchor foundation, as a new type of offshore foundation structure, has been widely used in various floating structures moored at sea, buoy positioning, storage facilities and other fields due to its advantages of convenient construction, fast construction speed (for example, a suction cylinder foundation with a diameter of 9m and a height of 10m can be sunk and penetrated within 1 to 3 hours, and only one pump is used), reusability and cost-effectiveness.

[0003] The suction anchor foundation is similar in appearance to a short steel pipe pile with a top cover. The suction anchor most commonly used in actual projects is a cylindrical structure with a closed upper end and an open lower end. The side walls and top cover are made of steel, and a pumping device and other supporting devices are installed on the top cover. The construction process of the suction anchor foundation is: component prefabrication - component transportation - positioning and lifting - self-weight sinking - negative pressure sinking - elevation measurement - equipment recovery.

[0004] The process of suction anchor penetrating the seabed: the suction anchor sinks freely to the seabed, and the edge of the cylinder is inserted into the seabed soil by its own gravity, forming a sealed space between the cylinder and the soil, and then the water in the cylinder is pumped out by an underwater submersible pump, forming an internal and external pressure difference. When the force of the pressure difference on the cylinder is greater than the resistance between the soil and the cylinder, the steel cylinder slowly penetrates the soil. When the top of the cylinder is in full contact with the seabed soil, the penetration stops, and then the submersible pump is turned off and removed, and the suction anchor is installed. After the suction anchor is installed, the negative pressure disappears. At this time, the suction anchor is actually like a conventional buried short pile, and the bearing capacity mainly depends on the friction between the inner and outer walls of the barrel and the soil.

[0005] At present, suction anchors have been successfully applied to many seawater projects. Compared with other offshore foundation forms, they have the following advantages: 1) They have been prefabricated and assembled on the shore, which is convenient for transportation; 2) During the construction process, they can be quickly installed, which speeds up the construction progress, shortens the construction time, saves construction costs, and reduces construction risks; 3) Greatly reduces the amount of steel used, significantly reducing costs; 4) They are applicable to most marine structures and different soil types. However, their disadvantages are also obvious: the suction anchor has weak lateral and vertical stiffness, insufficient self-pullout resistance, and poor self-stability.

[0006] There are various ways to install offshore suction anchors. Some use the traditional method to sink the suction anchor into the seabed. This method has high requirements on the soil quality of the seabed. It can not only ensure a sealed environment with the cylinder and no air leakage when the suction anchor is penetrated, but also ensure that sufficient resistance is provided after the suction anchor is installed. Some are equipped with underwater high-frequency vibration devices on the suction anchor, and rely on high-frequency vibration to penetrate the suction anchor into the seabed to the designed elevation. Others install high-pressure water jets and mud suction ports at the bottom of the suction anchor, and use high-pressure water flow to cut or wash away the soil at the bottom of the cylinder, and penetrate the suction anchor into the seabed to a specified depth.

[0007] However, these design solutions have major drawbacks for stable pile platforms: 1. Soil plugging is prone to occur. Under the action of the internal and external pressure difference, when the bottom opening of the suction anchor is inserted into the seabed soil, the soil inside the suction anchor barrel increases with the penetration depth of the barrel, and the soil inside the barrel is higher than the top elevation of the same soil layer. This will cause the suction anchor to be unable to penetrate to the designed elevation. Since the upper part of the suction anchor protrudes from the seabed surface, the original current path of the surrounding seabed is changed, causing part of the soil around the suction anchor to be washed away, forming a scouring pit. The existence of the scouring pit will greatly reduce the bearing capacity and various resistances of the suction anchor, and in severe cases, it will lead to the failure of the suction anchor installation.

[0008] 2. When the seabed soil is medium-dense or dense sand (i.e. harder soil), if relying on the traditional suction anchor foundation, it will initially penetrate part of the soil, but as the penetration depth increases, the penetration resistance will become very large, resulting in difficulty in penetration; if the seabed soil is uneven, the suction anchor will usually tilt, which will affect the use conditions of the suction anchor and limit its scope of application.

[0009] 3. The disassembly and assembly of the high-frequency vibration device takes a long time and requires that the exposed height of the instruments and equipment on the suction anchor top cover is very limited. It has high requirements for the design, construction, and installation of the equipment. If it is damaged or abnormal during the installation process, it cannot be repaired or replaced. At the same time, high-frequency vibration will weaken or liquefy the normally deposited soil and prolong the time for the soil to recover. The noise pollution it brings will have an adverse effect on marine life.

[0010] 4. Using high-pressure water flow to cut or flush away the soil at the bottom of the cylinder will reduce the bearing capacity of the soil and the frictional resistance to the cylinder, thereby affecting the normal use of the suction anchor, and the cylinder needs to be lengthened to compensate.

[0011] Therefore, it is urgent to design a static ballast device and method for assisting the sinking of the suction anchor to solve the above-mentioned problems. Summary of the invention

[0012] The purpose of the present invention is to provide a static ballast device and method for assisting the sinking of a suction anchor, which has the advantages of simple and convenient construction process, easy availability of heavy materials, reduced soil disturbance, environmental protection and pollution-free, rapid recovery of soil indicators, reduced dependence on large-scale machinery and tools, wide range of applications, reduced steel consumption, improved economy, increased construction speed, and reduced construction risks, thereby solving the problems mentioned in the background technology.

[0013] To achieve the above-mentioned purpose, the specific technical scheme of a static ballast device and method for assisting the sinking of a suction anchor of the present invention is as follows: A static ballast device for assisting a suction anchor in sinking comprises a static ballast platform, a ballast cavity for placing a weight block is provided on the static ballast platform, the static ballast platform is connected to the suction anchor via a fixing assembly, and the horizontality of the suction anchor can be changed by adjusting the position of the weight block in the ballast cavity.

[0014] Furthermore, the static ballast platform includes a plurality of support columns and a plurality of corner piles, and a bottom guard plate is fixedly connected between the plurality of support columns and the plurality of corner piles.

[0015] Furthermore, inner guard plates are fixedly connected between adjacent support columns, adjacent inner guard plates are fixedly connected to form an inner plate, outer guard plates are fixedly connected between adjacent corner piles, adjacent outer guard plates are fixedly connected to form an outer plate, and both ends of the bottom guard plate are fixedly connected to the inner plate and the outer plate respectively, forming a ballast chamber through the inner plate, the bottom guard plate and the outer plate.

[0016] Furthermore, the support column extends beyond the bottom guard plate, and one end of the support column extending beyond the bottom guard plate is connected to the suction anchor through a fixing assembly.

[0017] Furthermore, side columns are provided between adjacent corner piles, and the side columns are fixedly connected to the bottom guard plate and the outer guard plate.

[0018] Furthermore, a buoy leveling assembly is connected to the corner pile.

[0019] Furthermore, each support column is fixedly connected with a lifting lug, which can be connected to a lifting device of a lifting vessel or a crane.

[0020] A static ballast method for assisting the sinking of a suction anchor, using the static ballast device for assisting the sinking of a suction anchor, comprises the following steps: S1. On the shore or on land, connect and fix the suction anchor to the static ballast platform through a fixing device, and place and fix it on the transport barge through a crane; S2. The heavy block is placed on the transport barge by means of a crane. After being fixed and checked, the transport barge goes to the designated location; S3. After the transport barge arrives at the designated location, the drainage hole on the top of the suction anchor is opened, and then the lifting ship uses the lifting device to lift the suction anchor and the static ballast platform from the transport barge, so that the bottom of the suction anchor faces downward and the entire platform is placed in the water, keeping the static ballast platform above the water surface at a certain height; S4. The crane uses a lifting device to lift the heavy block from the transport barge to the static ballast platform and fix it; S5. The lifting vessel slowly lowers the static ballast platform through the lifting device, and at the same time observes the horizontality of the platform through the measuring instrument installed on the static ballast platform, keeps the entire static ballast platform level and slowly lowers it until all the suction anchors penetrate into the soil; S6, turn on the water pump, drain the water in the elevation front cylinder out of the cylinder, and then close the drainage hole; S7, opening the fixing device to separate the suction anchor from the support column; S8. The lifting vessel uses a lifting device to lift the static ballast platform to the sea surface, lifts the weight block from the static ballast platform by a crane and places it on the transport barge, and then the lifting vessel places the static ballast platform on the transport barge.

[0021] Furthermore, during the process of the suction anchor penetrating into the seabed soil, if it is found that the levelness tends to exceed the design allowable limit or the standard in the specification, the lifting vessel stops lowering and uses the buoy leveling assembly to level it to ensure that the levelness of the suction anchor meets the design requirements.

[0022] Furthermore, the horizontality of the suction anchor is constantly observed by means of a monitoring device installed on the suction anchor. If it is found that the horizontality has a tendency to exceed the design allowable limit or the standard in the specification, the lifting vessel stops lowering and the crane adjusts the position of the weight in the ballast chamber to ensure that the horizontality of the suction anchor meets the design requirements.

[0023] The present invention has the following advantages: (1) In order to solve the problem of large resistance and difficulty in penetration during the placement of the suction anchor foundation, static ballasting is adopted. According to the design requirements of the specific project, weight blocks of different shapes and weights (which can also be prefabricated) can be stacked to ensure that the penetration depth of the suction cylinder meets the design requirements.

[0024] (2) To address the problem of uneven seabed soil and tilting of the suction anchor during the placement of the suction anchor foundation, a static ballasting method is used. A monitoring device installed on the top cover of the suction anchor is used to monitor its horizontality at all times. When a trend of exceeding the standard is found, the weights stacked on the top (which can also be prefabricated) are adjusted in time to ensure that the horizontality of the suction cylinder meets the design requirements.

[0025] (3) The construction process is simple and convenient, and heavy materials are easily available; (4) Reduce soil disturbance, be environmentally friendly and pollution-free, and quickly restore soil indicators; the static ballasting method can minimize the disturbance to the soil under the seabed, and at the same time does not use mud, cement and other pollution sources that may cause pollution to the ocean. Due to the small disturbance to the soil, the physical and mechanical indicators of the soil can quickly return to their original state.

[0026] (5) Reduce steel consumption: According to the actual water depth and climatic conditions on site, support columns of appropriate height are selected. The static ballast platform is arranged with only one platform and equipped with four support columns. The amount of steel procurement, steel processing and prefabrication and installation work will be significantly reduced, thereby greatly reducing steel consumption.

[0027] (6) Reduce dependence on large-scale machinery and tools: The entire static ballast platform is arranged with only one platform and is equipped with four support columns. Even considering the heavy blocks stacked on the top, the overall weight is not large, so there is no need to rely on large-scale machinery and tools, thereby effectively reducing the dependence of the entire ballast device on large-scale machinery and tools.

[0028] (7) Wide range of applications: The weight of the entire static ballast device (including the weights stacked on the top) is applied to the suction anchor, so that it can overcome the resistance of the soil to it, thereby achieving the purpose of downward penetration. According to the different properties of the soil, the weight of the weights applied on the platform should also be adjusted accordingly. Generally, dense sand, silt and hard clay sites are applicable. In addition, the lengths of the four support columns can be reasonably adjusted according to the water depth of the site to meet the requirements of different water depths. At the same time, it can not only adapt to conventional round suction anchors, but also to special-shaped suction anchors, and only the support columns need to be adjusted.

[0029] (8) Improve construction efficiency and reduce construction risks: In the new invention, the entire static ballast device is arranged with only one platform and equipped with four support columns. The whole has been prefabricated and assembled on land. At sea, it is only necessary to align the suction anchor, fix it and place the upper weight block, which can greatly improve the construction efficiency, solve the problem of short construction window period, and effectively reduce the construction risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the static ballast device of the present invention; Figure 2 It is a schematic diagram of the transverse cross-sectional structure of the static ballast platform of the present invention; Figure 3 It is a schematic diagram of the vertical cross-section structure of the static ballast platform of the present invention; Explanation of the markings in the figure: 1. Static ballast platform; 11. Support column; 12. Corner pile; 13. Outer guard plate; 14. Inner guard plate; 15. Side column; 16. Diagonal support rod; 2. Suction anchor; 3. Weight block; 4. Buoy leveling assembly; 5. Lifting eye; 6. Fixing assembly. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0033] Please refer to the attached Figure 1 To Attachment Figure 3 The invention describes a static ballast device and method for assisting the sinking of a suction anchor.

[0034] The current design scheme has major drawbacks for the pile stabilization platform: 1. Soil plugging is prone to occur. Under the action of the internal and external pressure difference, when the bottom opening of the suction anchor is inserted into the seabed soil, the soil inside the suction anchor barrel increases with the penetration depth of the barrel, and the soil inside the barrel is higher than the top elevation of the same soil layer. This will cause the suction anchor to be unable to penetrate to the designed elevation. Since the upper part of the suction anchor protrudes from the seabed surface, the original current path of the surrounding seabed is changed, causing part of the soil around the suction anchor to be washed away, forming a scouring pit. The existence of the scouring pit will greatly reduce the bearing capacity and various resistances of the suction anchor, and in severe cases, it will lead to the failure of the suction anchor installation.

[0035] 2. When the seabed soil is medium-dense or dense sand (i.e. harder soil), if relying on the traditional suction anchor foundation, it will initially penetrate part of the soil, but as the penetration depth increases, the penetration resistance will become very large, resulting in difficulty in penetration; if the seabed soil is uneven, the suction anchor will usually tilt, which will affect the use conditions of the suction anchor and limit its scope of application.

[0036] 3. The disassembly and assembly of the high-frequency vibration device takes a long time and requires that the exposed height of the instruments and equipment on the suction anchor top cover is very limited. It has high requirements for the design, construction, and installation of the equipment. If it is damaged or abnormal during the installation process, it cannot be repaired or replaced. At the same time, high-frequency vibration will weaken or liquefy the normally deposited soil and prolong the time for the soil to recover. The noise pollution it brings will have an adverse effect on marine life.

[0037] 4. Using high-pressure water flow to cut or flush away the soil at the bottom of the cylinder will reduce the bearing capacity of the soil and the frictional resistance to the cylinder, thereby affecting the normal use of the suction anchor, and the cylinder needs to be lengthened to compensate.

[0038] Therefore, the static ballast device for assisting the sinking of the suction anchor includes a static ballast platform 1, on which a ballast cavity for placing a weight block 3 is opened. The static ballast platform 1 is connected to the suction anchor 2 through a fixing component 6 to ensure that the static ballast platform 1 and the suction anchor 2 will not be relatively displaced. The horizontality of the suction anchor 2 can be changed by adjusting the position of the weight block 3 in the ballast cavity.

[0039] Preferably, the specific number of weight blocks 3 is multiple, so that the horizontality of the suction anchor 2 can be changed by adjusting the position of the weight block 3 in the ballast chamber. In other embodiments of the present invention, the weight block 3 can also be arranged as a whole, as long as the static ballasting method can be met to lower the suction anchor 2.

[0040] In order to solve the problem that the suction anchor 2 encounters great resistance and is difficult to penetrate during its foundation sinking, the new invention adopts a static ballasting method. According to the design requirements of the specific project, weight blocks 3 of different shapes and weights (which can also be prefabricated) can be stacked to ensure that the penetration depth of the suction cylinder meets the design requirements.

[0041] In order to solve the problem of uneven seabed soil and tilt of the suction anchor 2 during the sinking of the suction anchor 2 foundation, the new invention adopts a static ballasting method, and observes its levelness at all times through a monitoring device installed on the top cover of the suction anchor 2. When a trend of exceeding the standard is found, the weight block 3 (which can also be prefabricated) stacked on the top is adjusted in time to ensure that the levelness of the suction cylinder meets the design requirements.

[0042] The static ballast platform 1 includes a plurality of support columns 11 and a plurality of corner piles 12, a bottom guard plate is fixedly connected between the plurality of support columns 11 and the plurality of corner piles 12, an inner guard plate 14 is fixedly connected between adjacent support columns 11, adjacent inner guard plates 14 are fixedly connected to form an inner plate, an outer guard plate 13 is fixedly connected between adjacent corner piles 12, adjacent outer guard plates 13 are fixedly connected to form an outer plate, two ends of the bottom guard plate are fixedly connected to the inner plate and the outer plate respectively, a ballast cavity is formed by the inner plate, the bottom guard plate and the outer plate, so that the ballast cavity is a cavity with an opening facing upward, and the inner plate, the bottom guard plate and the outer plate are used to prevent the weight block 3 inside the ballast cavity from sliding or even sliding out of the platform.

[0043] Preferably, the ballast chamber is divided into a plurality of placement chambers by a plurality of partitions, and the shapes of the placement chambers can correspond to the weight block 3, thereby further preventing the weight block 3 from sliding.

[0044] Specifically, the static ballast platform 1 is rectangular, so that the specific number of support columns 11 and corner piles 12 is four. The support columns 11 are located at the four corners inside the static ballast platform 1, and the corner piles 12 are located at the four corners outside the static ballast platform 1. The static ballast platform 1 of the present invention can also be other shapes, such as circular or polygonal. At this time, the number of support columns 11 and corner piles 12 is required to correspond to the shape of the static ballast platform 1, and the positions of the support columns 11 and the corner piles 12 are corresponding to the shape of the static ballast platform 1, as long as the static ballast mode can be met to lower the suction anchor 2.

[0045] Specifically, the support column 11 extends beyond the bottom guard plate, and one end of the support column 11 extending beyond the bottom guard plate is connected to the suction anchor 2 through the fixing assembly 6. The four support columns 11 support the weight of the upper static ballast platform 1 and transfer the weight of the upper static ballast platform 1 to the suction anchor 2.

[0046] Preferably, side columns 15 are provided between adjacent corner piles 12 , and the side columns 15 are fixedly connected to the bottom guard plate and the outer guard plate 13 , and the side columns 15 play an auxiliary supporting role for the outer guard plate 13 .

[0047] Furthermore, a buoy leveling assembly 4 is connected to the corner pile 12. By setting the buoy leveling assembly 4, during the process of the suction anchor 2 penetrating the seabed soil, if it is found that the horizontality tends to exceed the design allowable limit or the standard in the specification, the lifting vessel stops lowering and uses the buoy leveling assembly 4 to level it, ensuring that the horizontality of the suction anchor 2 meets the design requirements. Preferably, the specific number of the buoy leveling assemblies 4 is the same as the specific number of the corner piles 12, both of which are four. When the static ballast platform 1 is in other shapes, the specific number of the buoy leveling assemblies 4 is the same as the specific number of the corner piles 12.

[0048] Furthermore, each support column 11 is fixedly connected with a lifting lug 5, and the lifting lug 5 can be connected to a lifting device of a lifting vessel or a crane.

[0049] Furthermore, each support column 11 is connected to the corresponding side column 15 via an oblique brace 16 , and the specific number of the oblique brace 16 is eight, so that the eight oblique brace rods 16 play a role of auxiliary support.

[0050] The static ballast device of the present invention has good fixation, is adaptable to areas with deeper water depths, has a certain ability to resist the influence of sea breeze, waves and currents, meets the penetration requirements of the suction anchor 2, has a simple and convenient construction process, the material of the weight block 3 is easily available, reduces soil disturbance, is environmentally friendly and pollution-free, and soil indicators recover quickly, reducing dependence on large-scale machinery and tools. It has a wide range of applications, reduces steel consumption, improves economy, increases construction speed, and reduces construction risks.

[0051] A static ballast method for assisting the sinking of a suction anchor 2, using the static ballast device for assisting the sinking of a suction anchor 2, comprises the following steps: S1. On the shore or on land, connect and fix the suction anchor 2 to the static ballast platform 1 through a fixing device, carefully check the normal functions of each component and ensure that it meets the design and construction requirements, then place it on the transport barge by a crane and fix it; Specifically, in order to increase safety and save time, the suction anchor 2 can be connected and fixed to the static ballast platform 1 by a fixing device on the shore or on land, and the transport barge should also be provided with a fixed position for placing the construction equipment and related equipment for fixing it.

[0052] S2, the heavy block 3 is placed on the transport barge by means of a crane, and after being fixed and checked, the transport barge goes to the designated location; S3. After the transport barge arrives at the designated location, the drainage hole on the top of the suction anchor 2 is opened, and then the lifting ship uses a lifting device to lift the suction anchor 2 and the static ballast platform 1 from the transport barge, so that the bottom of the suction anchor 2 faces downward and the entire platform is placed in the water, keeping the static ballast platform 1 above the water surface at a certain height; Specifically, by opening the drainage hole on the top of the suction anchor 2, it is ensured that the seawater in the cylinder can be discharged out of the cylinder in time before the suction anchor 2 penetrates to the designed elevation, and the penetration process of the suction anchor 2 will not be adversely affected.

[0053] S4, the crane uses a sling to lift the weight 3 from the transport barge to the static ballast platform 1 and fix it; Specifically, in the process of hoisting the weight block 3 onto the static ballast platform 1, the stability of the static ballast platform 1 is maintained as much as possible to facilitate the fixation of the weight block 3, while avoiding excessive tilting or even overturning and other safety accidents.

[0054] S5. The lifting vessel slowly lowers the static ballast platform 1 through the lifting device, and at the same time observes the horizontality of the platform through the measuring instrument installed on the static ballast platform 1, keeps the entire static ballast platform 1 horizontal and slowly lowers it until the suction anchor 2 is completely penetrated into the soil; Preferably, during the process of the suction anchor 2 penetrating the seabed soil, if it is found that the levelness tends to exceed the design allowable limit or the standard in the specification, the lifting vessel stops lowering and uses the buoy leveling assembly 4 to level the suction anchor 2 to ensure that the levelness of the suction anchor 2 meets the design requirements.

[0055] Preferably, a monitoring device is provided on the suction anchor 2 to constantly observe the horizontality of the suction anchor 2. If it is found that the horizontality has a tendency to exceed the design allowable limit or the standard in the specification, the lifting vessel stops lowering and the crane adjusts the position of the weight 3 in the ballast chamber to ensure that the horizontality of the suction anchor 2 meets the design requirements.

[0056] S6, turn on the water pump, drain the water in the elevation front cylinder out of the cylinder, and then close the drainage hole; S7, opening the fixing device to separate the suction anchor 2 from the support column 11; S8, the hoisting ship uses a hoisting device to lift the static ballast platform 1 to the sea surface, lifts the weight 3 from the static ballast platform 1 by a crane and places it on the transport barge, and then the hoisting ship places the static ballast platform 1 on the transport barge; S9. After completing all on-site operations, you can move to the next construction location.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A static ballast device for assisting the sinking of a suction anchor, characterized in that: It includes a static ballast platform, on which a ballast cavity for placing weights is opened. The static ballast platform is connected to the suction anchor through a fixing component, and the horizontality of the suction anchor can be changed by adjusting the position of the weight in the ballast cavity.

2. The static ballast device for assisting the sinking of a suction anchor according to claim 1, characterized in that: The static ballast platform comprises a plurality of support columns and a plurality of corner piles, and a bottom guard plate is fixedly connected between the plurality of support columns and the plurality of corner piles.

3. The static ballast device for assisting the sinking of a suction anchor according to claim 2, characterized in that: An inner guard plate is fixedly connected between adjacent support columns, and adjacent inner guard plates are fixedly connected to form an inner plate. An outer guard plate is fixedly connected between adjacent corner piles, and adjacent outer guard plates are fixedly connected to form an outer plate. Both ends of the bottom guard plate are fixedly connected to the inner plate and the outer plate respectively, and a ballast chamber is formed by the inner plate, the bottom guard plate and the outer plate.

4. The static ballast device for assisting the sinking of a suction anchor according to claim 2, characterized in that: The support column extends beyond the bottom guard plate, and one end of the support column extending beyond the bottom guard plate is connected to the suction anchor through a fixing component.

5. The static ballast device for assisting the sinking of a suction anchor according to claim 3, characterized in that: Side columns are arranged between adjacent corner piles, and the side columns are fixedly connected to the bottom guard plate and the outer guard plate.

6. The static ballast device for assisting the sinking of a suction anchor according to claim 3, characterized in that: A buoy leveling assembly is connected to the corner pile.

7. The static ballast device for assisting the sinking of a suction anchor according to claim 2, characterized in that: Each support column is fixedly connected with a lifting lug, which can be connected to a lifting device of a lifting vessel or a crane.

8. A static ballasting method for assisting the sinking of a suction anchor, characterized in that: The static ballast device for assisting the sinking of a suction anchor as claimed in any one of claims 1 to 8 comprises the following steps: S1. On the shore or on land, connect and fix the suction anchor to the static ballast platform through a fixing device, and place and fix it on the transport barge through a crane; S2. The heavy block is placed on the transport barge by means of a crane. After being fixed and checked, the transport barge goes to the designated location; S3. After the transport barge arrives at the designated location, the drainage hole on the top of the suction anchor is opened, and then the lifting ship uses the lifting device to lift the suction anchor and the static ballast platform from the transport barge, so that the bottom of the suction anchor faces downward and the entire platform is placed in the water, keeping the static ballast platform above the water surface at a certain height; S4. The crane uses a lifting device to lift the heavy block from the transport barge to the static ballast platform and fix it; S5. The lifting vessel slowly lowers the static ballast platform through the lifting device, and at the same time observes the horizontality of the platform through the measuring instrument installed on the static ballast platform, keeps the entire static ballast platform level and slowly lowers it until all the suction anchors penetrate into the soil; S6, turn on the water pump, drain the water in the elevation front cylinder out of the cylinder and then close the drainage hole; S7, opening the fixing device to separate the suction anchor from the support column; S8. The lifting vessel uses a lifting device to lift the static ballast platform to the sea surface, lifts the weight block from the static ballast platform by a crane and places it on the transport barge, and then the lifting vessel places the static ballast platform on the transport barge.

9. The static ballasting method for assisting the sinking of a suction anchor according to claim 8, characterized in that: During the process of the suction anchor penetrating into the seabed soil, if it is found that the levelness tends to exceed the design allowable limit or the standard in the specification, the lifting vessel will stop lowering and level it through the buoy leveling assembly to ensure that the levelness of the suction anchor meets the design requirements.

10. The static ballasting method for assisting the sinking of a suction anchor according to claim 8, characterized in that: The horizontality of the suction anchor is constantly monitored by the monitoring device installed on the suction anchor. If it is found that the horizontality tends to exceed the design allowable limit or the standard in the specification, the lifting vessel stops lowering and the crane adjusts the position of the weight in the ballast chamber to ensure that the horizontality of the suction anchor meets the design requirements.

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