Self-adaptive suction bucket foundation under seabed complex working conditions
By adopting directional pumping and drainage systems and high-strength grouting technology in offshore wind power foundations, the problem of insufficient bearing performance caused by the super-hole pressure of soil under complex sea conditions is solved, the bearing capacity and safety of the suction barrel foundation is improved, and construction costs are reduced , ensure the stable operation of the fan.
Patent Information
- Application Number
- CN202420916199.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-29
AI Technical Summary
The load-bearing performance of offshore wind power foundations under complex sea conditions has been insufficient, resulting in an increase in the soil over-hole pressure, reducing the load-bearing performance of the suction barrel foundation. The existing technology has failed to effectively regulate the over-hole pressure, resulting in high construction costs and unanticipated improvements in the load-bearing performance. .
A suitable suction barrel foundation under complex seabed conditions was designed, and a directional pumping system and a directional partition drainage system were used to monitor and discharge pore water in the soil through high-performance submersible pumps and drainage pipes, reducing the super-pore pressure and increasing the The soil is effectively stressed and injected with high-strength grout into the bottom of the foundation in an emergency to improve the pull-up resistance.
It improves the adaptability and safety margin of the suction barrel foundation in complex seabed environments, increases the bearing capacity, reduces construction costs, ensures the smooth operation of the fan structure, and avoids the impact of engineering accidents and power generation efficiency.
Smart Images
Figure CN222183430U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of pile foundation engineering equipment for offshore wind power projects, and in particular to a suction bucket foundation that is adaptive to complex seabed working conditions. Background Art
[0002] With the rapid development of offshore wind power construction, in order to adapt to more extreme offshore conditions and support larger-scale wind turbines, super-large offshore wind power foundations have emerged. During service, offshore wind turbine foundations are subject to a variety of complex environmental loads, such as wind loads, wave loads, ice loads, ocean current loads, etc., and the loads are variable and irregular. Therefore, the bearing performance of wind turbine foundations under complex sea conditions is a very important link in offshore wind power design. In addition, in order to adapt to more complex deep-sea environments, the size of offshore wind power foundations is also getting larger and larger. Therefore, studying measures to improve the bearing performance of offshore wind power foundations is a very important topic. During the operation period, the suction bucket foundation is constantly bearing loads in all directions, which leads to an increase in the pore water pressure of the soil around the suction bucket foundation, a decrease in effective stress, and a decrease in the shear strength of the soil. At the same time, the increase in pore water pressure in the soil will also lead to a decrease in the foundation-soil interface strength, thereby reducing the bearing performance of the suction bucket foundation to below reasonable requirements. However, the offshore wind power foundation in the relevant technology has not yet involved how to finely regulate the excess pore pressure in the soil around the suction bucket foundation to reduce the impact of the soil excess pore pressure on the bearing capacity of the suction bucket foundation. Therefore, the construction cost is high, and the bearing capacity of the suction bucket foundation has not yet been improved as expected. Utility Model Content
[0003] The embodiment of the present application provides an adaptive suction bucket foundation under complex submarine working conditions. The adaptive suction bucket foundation under complex submarine working conditions can finely regulate the excess pore pressure in the soil around the suction bucket foundation to prevent engineering accidents caused by too low bearing capacity of the suction bucket foundation. At the same time, it can also provide wind turbines with emergency measures by injecting high-strength grouting into the bottom of the foundation to prevent the wind turbine from tipping over and deforming too much, thereby affecting its power generation efficiency.
[0004] The self-adaptive suction bucket foundation under complex submarine working conditions provided in the embodiment of the present application comprises: a suction bucket, wherein the suction bucket comprises a side skirt and a top plate, wherein the side skirt is a cylindrical structure, the top plate is located at one end of the side skirt along the length direction, and the side skirt and the top plate enclose a cavity of the suction bucket;
[0005] A grouting channel, the grouting channel is located on the top plate, and the grouting channel is connected to the cavity of the suction bucket;
[0006] A directional pumping system, the directional pumping system comprising a high-performance submersible pump and a partitioned pumping pipeline, one interface of the high-performance submersible pump being connected to the grouting channel, and the other interface being connected to the partitioned pumping pipeline;
[0007] A directional partitioned drainage system, the directional partitioned drainage system includes a water collection pipe, a drainage pipe and a partition valve. The water collection pipe is arranged on the outer wall of the side skirt along the circumference of the side skirt. There are multiple drainage pipes, and the multiple drainage pipes are arranged at intervals along the length direction of the side skirt. The drainage pipe is connected to the water collection pipe, and the partition valve is arranged on the water collection pipe.
[0008] In addition, the suction bucket foundation provided in the embodiment of the present application may also have the following additional technical features:
[0009] In an optional solution, the suction bucket foundation also includes a sinking valve and a negative pressure valve, and the sinking valve and the negative pressure valve are respectively arranged on the top plate, and the sinking valve and the negative pressure valve are respectively connected to the cavity of the suction bucket; the number of the partition valves is 2, and the 2 partition valves are arranged relatively to each other.
[0010] In an optional solution, the number of the high-performance submersible pumps is 2 groups, the 2 groups of high-performance submersible pumps are arranged relatively to each other, the partitioned pumping pipes are connected to the water collection pipes, and valves are provided on the partitioned pumping pipes.
[0011] In an optional solution, the side skirts and the top plate are made of steel plates, and the thickness of the side skirts and the top plate is not less than 0.03 m.
[0012] In an optional solution, at least one of the grouting channel and the drainage pipe is made of a hollow steel pipe, the outer surface of the drainage pipe is provided with drainage holes, and the inner surface of the drainage pipe is provided with a geotextile, which is a water-permeable geosynthetic material.
[0013] In an optional solution, the partition valve is horizontally arranged in the middle section of the water collecting pipe, and the partition valve is used to control the range of the pore water pressure to be pumped out.
[0014] The beneficial effects of the embodiments of the present application are:
[0015] The suction bucket foundation in the embodiment of the present application can increase the contact area between the inner and outer sides of the suction bucket and the surrounding soil through the drainage pipes set up, thereby increasing the ultimate bearing capacity of the suction bucket during its service life; the directional zoned drainage system can realize directional discharge of pore water in the soil, reduce excess pore water pressure, and increase the effective stress of the soil; this system can improve the adaptability and safety margin of the suction bucket in a complex seabed environment; in an emergency, high-strength grouting can be injected into the bottom of the foundation through the directional zoned drainage system; the high-strength grouting solidifies rapidly, thereby reducing the settlement of the suction bucket foundation, increasing its pull-out resistance, and ensuring the smooth operation of the upper fan structure.
[0016] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A schematic structural diagram of a suction bucket foundation provided in the present application in a specific embodiment;
[0018] Figure 2 for Figure 1 Schematic diagram of the partial plane structure of the medium suction bucket foundation;
[0019] Figure 3 for Figure 1 Schematic diagram of the top view of the medium suction bucket foundation.
[0020] Figure numerals: suction bucket 1, side skirt 11, top plate 12, grouting channel 2, directional pumping system 3, high-performance submersible pump 31, partitioned pumping pipe 32, valve 33, directional partitioned drainage system 4, water collection pipe 41, drainage pipe 42, partition valve 43, submerged valve 5, negative pressure valve 6.
[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION
[0022] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.
[0023] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0024] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.
[0025] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0026] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.
[0027] like Figure 1-3 As shown, the embodiment of the present application provides an adaptive suction bucket foundation under complex submarine working conditions, which comprises a suction bucket 1, a grouting channel 2, a directional pumping system 3 and a directional partition drainage system 4. The suction bucket 1 comprises a side skirt 11 and a top plate 12. The side skirt 11 is a cylindrical structure. The top plate 12 is located at one end of the side skirt 11 along the length direction. The side skirt 11 and the top plate 12 enclose a cavity of the suction bucket 1; the grouting channel 2 is located on the top plate 12, and the grouting channel 2 is connected to the cavity of the suction bucket 1; the directional pumping system 3 comprises a side skirt 11 and a top plate 12. It includes a high-performance submersible pump 31 and a partitioned pumping pipe 32. One interface of the high-performance submersible pump 31 is connected to the grouting channel 2, and the other interface is connected to the partitioned pumping pipe 32; the directional partitioned drainage system 4 includes a water collecting pipe 41, a drainage pipe 42 and a partitioning valve 43. The water collecting pipe 41 is arranged on the outer wall of the side skirt 11 along the circumference of the side skirt 11. There are multiple drainage pipes 42, and the multiple drainage pipes 42 are arranged at intervals along the length direction of the side skirt 11. The drainage pipe 42 is connected to the water collecting pipe 41, and the partitioning valve 43 is arranged on the water collecting pipe 41.
[0028] like Figure 1-3As shown, the directional pumping system 3 specifically includes a high-performance submersible pump 31, a partitioned pumping pipe and a valve 33. The high-performance submersible pump 31 is a submersible pump for both pumping and grouting. One high-performance submersible pump 31 controls two partitioned pumping pipes and corresponding valves 33, and the valve 33 can be closed and opened according to the pore water pressure monitoring results. In addition, the adaptive suction bucket foundation under complex submarine working conditions also includes a pore pressure monitoring system, which is used to monitor the pore water pressure at the bottom of the suction bucket 1. When the pore pressure monitoring system detects that the pore water pressure at the bottom of the suction bucket 1 reaches a certain level, the directional partitioned drainage system 4 will directional partition the pore water pressure at the bottom of the suction bucket 1, effectively reducing the excess pore pressure and increasing the effective stress of the soil, thereby improving the bearing capacity of the suction bucket foundation. By directional partitioning and pumping the pore water pressure in the soil, the stress state of the soil at the bottom of the foundation can be quickly improved, and at the same time, the operating power of the pump can be reduced and its service life can be extended. This set of directional zoned drainage system 4 can not only effectively improve the bearing capacity of the suction bucket foundation, but also reduce the size of the suction bucket foundation, reduce the amount of steel used, and increase its economy.
[0029] The suction bucket foundation in this embodiment, which is adaptive to complex submarine working conditions, increases the contact area between the inner and outer sides of the suction bucket 1 and the surrounding soil by setting a semicircular drainage pipe (i.e., drainage pipe 42) on the inner and outer sides of the suction bucket 1, thereby significantly increasing the ultimate bearing capacity of the suction bucket 1 during its service life; through the directional partition drainage system 4 and the pore pressure monitoring system, the pore water in the soil is directionally discharged, the excess pore water pressure is reduced, and the effective stress of the soil is increased; this system can improve the adaptability and safety margin of the suction bucket 1 in complex submarine environments; in an emergency, high-strength grouting can be injected into the bottom of the foundation through the directional partition drainage system 4; the high-strength grouting solidifies quickly, which can reduce the settlement of the suction bucket foundation, increase its pull-out resistance, and ensure the smooth operation of the upper fan structure. Under extreme working conditions, the deformation of the suction bucket foundation (foundation top rotation angle) is too large, which will affect the power generation efficiency of the upper fan. Through the directional partition drainage system 4, high-strength grouting can be injected into the bottom of the foundation in a directional partitioned manner to prevent the suction bucket 1 from further deformation and the overall collapse of the fan.
[0030] like Figure 1-3 As shown, in a specific embodiment, the suction bucket foundation also includes a sinking valve 5 and a negative pressure valve 6, which are respectively arranged on the top plate 12, and the sinking valve 5 and the negative pressure valve 6 are respectively connected to the cavity of the suction bucket 1; the number of partition valves 43 is 2, and the 2 partition valves 43 are arranged relatively.
[0031] like Figure 1-3As shown, in a specific embodiment, the number of high-performance submersible pumps 31 is 2 groups, and the 2 groups of high-performance submersible pumps 31 are arranged oppositely, and two sections of small-diameter water pumping pipes and one section of grouting pipe are connected at the same time. The side skirt 11 and the top plate 12 are made of steel plates, and the thickness of the side skirt 11 and the top plate 12 is not less than 0.03m. At least one of the grouting channel 2 and the drainage pipe 42 is made of a hollow steel pipe. The top of the grouting channel 2 is connected to the sea surface grouting port, and the other two sides are connected to two high-performance submersible pumps 31. In addition, the submerged valve 5 is composed of a hollow steel pipe with a smaller diameter and a valve 33. The water collection pipe 41 and the drainage pipe 42 are welded to the surface of the side skirt 11 of the suction bucket 1 by a semicircular hollow steel pipe. The water collection pipe 41 is connected to the water pumping pipe of the pumping system. The outer surface of the drainage pipe 42 is provided with drainage holes, and the inner surface is provided with a geotextile. The geotextile is a geosynthetic material with water permeability. High-performance submersible pumps 31 are distributed on both sides of the top plate 12 and connected to the water collecting pipe downwards. The water collecting pipe is connected to the drainage pipes on all the side skirts 11. The partition valve 43 is horizontally arranged in the middle section of the water collecting pipe, which can be opened or closed as needed to control the range of the pore water pressure.
[0032] The adaptive suction bucket foundation under complex seabed working conditions provided in the embodiment of the present application can be used in the following steps: Step 1: The suction bucket 1 is lowered to the seabed or underground by a lifting device (such as a lifting hook) or its own gravity, the sinking valve 5 is opened, and the suction bucket 1 is sunk by its own weight until the suction bucket 1 reaches the target depth.
[0033] Step 2: Once the suction barrel 1 reaches the target depth, close the sinking valve 5, open the negative pressure valve 6, pump out the water in the barrel, form a negative pressure in the barrel, suck the surrounding sediment into the barrel, and control the strength and duration of the suction to ensure the sinking effect of the suction barrel 1.
[0034] Step 3: During the operation period, when the suction bucket 1 is subjected to a storm surge in a short period of time, the pore water pressure in the soil on the compression side surges and the effective stress decreases. When the directional zoned drainage system 4 detects that the surge in pore water pressure leads to a significant decrease in effective stress, the zoned valve 43 is closed, the pump is started, the pore water pressure on the compression side is discharged, the pore pressure dissipation is accelerated, and the overall stability of the suction bucket foundation is restored.
[0035] Step 4: When the discharge of the pore water pressure on the pressure side and the accelerated pore pressure dissipation are not enough to restore the overall stability of the suction bucket foundation, and the deformation of the suction bucket foundation is detected to be too large, affecting the power generation efficiency of the wind turbine, the operation and maintenance personnel can start the high-performance submersible pump 31 to inject high-strength grouting into the bottom of the suction bucket 1 through the grouting pipeline to prevent it from further deformation and prevent its overall collapse.
[0036] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. An adaptive suction bucket foundation under complex seabed conditions, characterized in that: include: A suction bucket, the suction bucket comprising a side skirt and a top plate, the side skirt being a cylindrical structure, the top plate being located at one end of the side skirt along the length direction, the side skirt and the top plate enclosing and forming a cavity of the suction bucket; A grouting channel, the grouting channel is located on the top plate, and the grouting channel is connected to the cavity of the suction bucket; A directional pumping system, the directional pumping system comprising a high-performance submersible pump and a partitioned pumping pipeline, one interface of the high-performance submersible pump being connected to the grouting channel, and the other interface being connected to the partitioned pumping pipeline; A directional partitioned drainage system, the directional partitioned drainage system includes a water collection pipe, a drainage pipe and a partition valve. The water collection pipe is arranged on the outer wall of the side skirt along the circumference of the side skirt. There are multiple drainage pipes, and the multiple drainage pipes are arranged at intervals along the length direction of the side skirt. The drainage pipe is connected to the water collection pipe, and the partition valve is arranged on the water collection pipe.
2. The self-adaptive suction bucket foundation under complex seabed working conditions according to claim 1 is characterized in that: It also includes a sinking valve and a negative pressure valve, which are respectively arranged on the top plate, and the sinking valve and the negative pressure valve are respectively connected to the cavity of the suction bucket; the number of the partition valves is 2, and the 2 partition valves are arranged relatively.
3. The self-adaptive suction bucket foundation under complex seabed working conditions according to claim 1 or 2, characterized in that: The number of the high-performance submersible pumps is 2 groups, and the 2 groups of high-performance submersible pumps are arranged relatively to each other. The partitioned water pumping pipes are connected to the water collecting pipes, and valves are arranged on the partitioned water pumping pipes.
4. The self-adaptive suction bucket foundation under complex seabed working conditions according to claim 3 is characterized in that: The side skirts and the top plate are made of steel plates, and the thickness of the side skirts and the top plate is not less than 0.03 m.
5. The self-adaptive suction bucket foundation under complex seabed conditions according to claim 3 is characterized in that: At least one of the grouting channel and the drainage pipe is made of a hollow steel pipe, the outer surface of the drainage pipe is provided with drainage holes, and the inner surface of the drainage pipe is provided with a geotextile, which is a geosynthetic material with water permeability.
6. The self-adaptive suction bucket foundation under complex seabed working conditions according to any one of claims 1-2 or 4-5, characterized in that: The partition valve is horizontally arranged in the middle section of the water collecting pipe, and the partition valve is used to control the range of the pore water pressure to be pumped out.