CN214143832U - Underwater pile foundation scouring protection device - Google Patents
Underwater pile foundation scouring protection device Download PDFInfo
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- CN214143832U CN214143832U CN202023002982.8U CN202023002982U CN214143832U CN 214143832 U CN214143832 U CN 214143832U CN 202023002982 U CN202023002982 U CN 202023002982U CN 214143832 U CN214143832 U CN 214143832U
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Abstract
The utility model discloses a pile foundation erodees protector under water belongs to offshore wind-powered pile foundation and erodees protection frock technical field. The offshore wind power pile comprises a plurality of sinking row assemblies arranged in an array, wherein adjacent sinking row assemblies are connected with each other through flexible cables and are laid on a seabed around an offshore wind power pile; the mattress sinking component comprises a framework and a sand quilt, and the sand quilt is fixed on the framework. Because the lower part of the sand quilt is provided with the flaky framework formed by connecting the ropes, the flaky framework mutually plays a certain supporting role, the whole scouring protection device cannot generate large displacement due to the formation of a local small scouring pit, the exposed area of the seabed is prevented from being enlarged, the local scouring pit reaches a stable state after reaching a small depth due to the small exposed area of the seabed, the area and the depth are not continuously expanded, and the fundamental control on the scouring of the seabed around the pile foundation is realized on the scouring mechanism.
Description
Technical Field
The utility model belongs to the technical field of offshore wind power pile basis erodees protection, a pile basis erodees protector under water is related to.
Background
In an offshore wind farm in an offshore sea area, a fixed pile foundation is mainly adopted, and an offshore wind turbine is fixed on a seabed through the pile foundation. A large-scale muddy seabed exists offshore, and is influenced by tide, so that the sediment on the seabed is not stable and is easy to scour. The pile foundation has a certain disturbance effect on the ocean current, and the scouring effect of the ocean current on the seabed around the pile foundation is obviously enhanced, so that a scouring pit is particularly easy to form around the offshore wind power pile foundation. If the scouring pit is continuously enlarged, the mud burying depth of the pile foundation is reduced, and the safety of the offshore wind turbine generator is seriously threatened. According to the actual monitoring data of the offshore wind power plant, the most serious wind power plant position is scoured, the diameter of a scouring pit is enlarged to hundreds of meters within two years, the maximum scouring depth reaches 17 meters, the total scouring amount reaches thousands of cubic meters, and the safety of the offshore wind power plant is seriously threatened. Therefore, protective measures are needed to prevent the scouring of the seabed around the pile foundation.
At present, the commonly used scouring protection measure of the offshore wind power foundation is to lay a sand quilt around the pile foundation, and utilize the connected sand quilt to sink into the sea to cover the seabed around the pile foundation, thereby reducing the scouring action of water flow on the seabed around the pile foundation. However, the protection area around the pile foundation which needs to be covered by sand is large, a plurality of pieces of sand need to be spliced and covered, the sand quilt is a braided fabric with sand filled inside and is similar to a quilt, the sand quilt is flexible, continuous laying in a sea area with a certain flow velocity is not easy, under the impact action of waves and currents, the sand quilt cannot be guaranteed to be accurately laid at a preset position in the process of entering the water, in addition, for turbid sea areas with high sand content, an effective means for monitoring the laying quality of the sand quilt is not available, the sand quilt is likely to be not tightly attached to the sand quilt, large gaps are formed, water flow begins to erode the seabed from the gaps, scouring pits are formed, and the sand quilt slides and moves towards the scouring pits, so that the seabed exposed area is continuously enlarged, and the protection effect is completely lost.
Disclosure of Invention
In order to solve the problem, the utility model aims to provide an underwater pile foundation erodees protector has realized from the mechanism of erodeing that the root that erodees the peripheral seabed of pile foundation is controlled, effectively protects the pile foundation.
The utility model discloses a realize through following technical scheme:
the utility model discloses an underwater pile foundation scouring protection device, which comprises a plurality of sinking row components arranged in an array, wherein adjacent sinking row components are connected with each other through flexible cables and are laid on the seabed around an offshore wind power pile;
the mattress sinking component comprises a framework and a sand quilt, and the sand quilt is fixed on the framework.
Preferably, for the offshore wind power pile of the single pile type, the total length of the sinking and draining assembly along the tidal current direction is more than 10 times of the diameter of the offshore wind power pile, and the total length along the vertical tidal current direction is more than 6 times of the diameter of the offshore wind power pile.
Preferably, for the multi-pile offshore wind power pile, the center distance of two farthest piles plus the diameter of a single pile is taken as the equivalent pile foundation diameter, the total length of the row sinking assembly in the tidal current direction is greater than 10 times of the equivalent pile foundation diameter, and the total length in the vertical tidal current direction is greater than 6 times of the equivalent pile foundation diameter.
Preferably, the area of the sand quilt in the mattress assembly is larger than the area of the framework.
Preferably, the length of the flexible cable between adjacent mattress sinking assemblies is 5-15 cm.
Preferably, the flexible cable and the framework are made of weather-resistant materials.
Preferably, the framework is of a cross beam structure, and a connecting hole for penetrating the flexible cable is formed in the end part of each direction of the cross beam.
Preferably, the buoyancy force borne by the mattress assembly when the mattress assembly is completely submerged is 60% -80% of the gravity force of the mattress assembly.
Preferably, the lower surface of the skeleton is planar.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses an underwater pile foundation scouring protection device, a framework is used as a support of a sand quilt in a sinking and draining assembly, and the sand quilt is prevented from being deformed; the flexible cable is used for connecting the frameworks, so that large gaps can be prevented from occurring among the mattress sinking assemblies, and no overlapping is generated; in addition, as a plurality of complex marine environmental factors may cause the damage of local sand quilt or the occurrence of gaps between the sunken rows, and the exposed local seabed is caused, the seawater can form low-degree undermining erosion to the seabed from the gap part to form a small erosion pit, and as the below of the sand quilt is a flaky framework formed by connecting ropes, a certain supporting function is realized between the sand quilt and the seabed, the whole erosion protection device can not generate large displacement due to the formation of the local small erosion pit, the exposed area of the seabed is prevented from being enlarged, and as the exposed area of the seabed is smaller, the local erosion pit reaches a stable state after reaching a smaller depth, the area and the depth are not expanded any more, thereby realizing the fundamental control of the erosion to the seabed around the pile foundation from the erosion mechanism.
Further, in the tidal current direction, the influence range of the turbulent flow formed by the influence of the pile columns on the ocean current on the seabed scouring is larger, so that the laying range of the protection device in the tidal current direction is larger. Therefore, for the single-pile offshore wind power pile, the total length of the row sinking assembly in the tidal current direction is greater than 10 times of the diameter of the offshore wind power pile, and the total length in the vertical tidal current direction is greater than 6 times of the diameter of the offshore wind power pile; for the multi-pile offshore wind power pile, the center distance of two piles which are farthest away and the diameter of a single pile are taken as the equivalent pile foundation diameter, the total length of the row sinking assembly in the tide direction is 10 times larger than the equivalent pile foundation diameter, and the total length in the perpendicular tide direction is 6 times larger than the equivalent pile foundation diameter.
Furthermore, the area of the sand quilt in the mattress sinking component is larger than that of the framework, so that the framework can be covered, and the phenomenon that the gap is exposed to cause the exposure of a local seabed is avoided.
Furthermore, the length of the flexible cable between adjacent row sinking assemblies is 5-15 cm, the distance is too short, the flexibility is insufficient, and the construction and installation are inconvenient; if the distance is too long, the row sinking elements may be stacked or gaps between the row sinking elements may be too large.
Furthermore, the flexible cable and the framework are made of weather-resistant materials, so that seawater corrosion is prevented, and the service life of the device is prolonged.
Furthermore, the framework adopts a cross beam structure, so that the structure is simple, the installation and construction are convenient, and the structure is stable and the firmness is good.
Furthermore, the buoyancy borne by the sinking-discharging assembly when the sinking-discharging assembly is completely submerged is 60% -80% of the gravity of the sinking-discharging assembly, the sinking speed of the sinking-discharging assembly can be controlled in the laying process, the sinking is prevented from being too fast, large impact and vortex are avoided, and the operation time for unwinding the floating rope is sufficient.
Furthermore, the lower surface of the framework is a plane, and when the sinking-discharging assembly sinks into the seabed, the framework is naturally embedded into the mud surface of the seabed under the action of gravity, so that the resistance can be increased, and the movement can be prevented.
Drawings
FIG. 1 is a front view of the overall structure of the present invention;
fig. 2 is a schematic top view of the overall structure of the present invention;
fig. 3 is a schematic view of the mattress assembly of the present invention;
fig. 4 is a schematic view of a rope connection mode between cross beams of the multi-block mattress sinking assembly of the present invention.
In the figure, 1-seawater; 2-offshore wind power pile; 3-the seabed; 4-scouring protection devices; 5-flexible cord; 6-a framework; 7-a sand quilt; 8-sinking and arranging the components.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
as shown in fig. 1 and 2, for the underwater pile foundation scouring protection device of the utility model, the submerged row assemblies 8 arranged in a plurality of arrays are connected with each other through the flexible cables 5 between the adjacent submerged row assemblies 8 and are laid on the seabed 3 around the offshore wind power pile 2.
For the single-pile offshore wind power pile 2, the total length of the row sinking assembly 8 in the tidal current direction is greater than 10 times of the diameter of the offshore wind power pile 2, and the total length in the vertical tidal current direction is greater than 6 times of the diameter of the offshore wind power pile 2.
For the multi-pile offshore wind power pile 2, the center distance of two piles which are farthest away and the diameter of a single pile are taken as the equivalent pile foundation diameter, the total length of the row sinking assembly 8 in the tide direction is 10 times larger than the equivalent pile foundation diameter, and the total length in the perpendicular tide direction is 6 times larger than the equivalent pile foundation diameter.
As shown in fig. 3, the mattress assembly 8 includes a framework 6 and a sand quilt 7, and the sand quilt 7 is fixed on the framework 6. The area of the sand quilt 7 in the mattress 8 is larger than that of the framework 6. The flexible cord 5 and the framework 6 are preferably made of a weather-resistant material. Preferably, the lower surface of the skeleton 6 is planar.
The framework 6 can adopt a cross beam structure, and the end part of each direction of the cross beam is provided with a connecting hole for penetrating the flexible cable 5. As shown in FIG. 4, the length of the flexible cable 5 between adjacent row modules 8 is 5-15 cm.
When the sinking-discharging component 8 is completely submerged, the buoyancy force borne by the sinking-discharging component 8 is 60-80% of the gravity of the sinking-discharging component 8.
The construction method of the underwater pile foundation scouring protection device is characterized by comprising the following steps:
transporting a plurality of sinking-discharging assemblies 8 to a target sea area, binding a buoy on each sinking-discharging assembly 8, placing the sinking-discharging assemblies 8 on the sea surface, enabling the sinking-discharging assemblies 8 to be suspended under the sea surface with a certain depth by the buoy, connecting the first sinking-discharging assembly 8 entering water with a marine wind power pile 2 by using a temporary rope, sequentially arranging all the sinking-discharging assemblies 8 towards the periphery by taking the marine wind power pile 2 as a starting point, connecting adjacent sinking-discharging assemblies 8 by using flexible ropes 5, and arranging the sinking-discharging assemblies 8 at the periphery of the marine wind power pile 2 next to the marine wind power pile 2 for a circle until the arrangement length and width reach preset values; after all the sinking-discharging assemblies 8 are arranged, adjusting the angle to enable the arrangement length direction of the sinking-discharging assemblies 8 to be parallel to the tide direction; all the floats are undone and recovered, allowing all the mattress assemblies 8 to sink onto the seabed 3.
The invention is further explained below in terms of an engineering implementation:
offshore wind power pile 2 of a certain offshore wind power plant is a single pile foundation, framework 6 of row sinking assembly 8 is made of logs, the logs are connected into a cross beam through bolts, sand is fixed on the cross beam through ropes by 7, the length of each sand side of 7 is greater than the length of the log of the cross beam by 10cm, the cross beam is ensured to be covered, the cross beam is arranged under, the sand is arranged on the cross beam, and the cross beam is combined with the sand by 7 to form the row sinking assembly 8 as framework 6 of the sand side of 7. The adjacent mattress sinking assemblies 8 are connected by ropes to form a large coverage area. The end of the well beam of the row sinking assembly 8 is punched, the adjacent well beams are connected together through a rope, and the distance between the ends of the adjacent well beams is controlled to be 8 cm. The connected sunken rows are laid around the pile foundation of the offshore wind turbine generator system to form a set of complete pile foundation scouring protection device 4. In the tidal current direction, the pile foundation diameter of which the laying length is 5 times is laid by the scouring protection device 4 on one side of the offshore wind power pile 2, and in the direction perpendicular to the tidal current direction, the pile foundation diameter of which the laying length is 3 times is laid on one side of the offshore wind power pile 2. The main parameters are as in table 1:
TABLE 1
During construction: firstly, fixing a sand quilt 7 and a cross beam together by using a rope, wherein the cross beam is arranged below the sand quilt 7, and the sand quilt 7 is arranged above the sand quilt, and transporting a plurality of mattress assemblies 8 to a target sea area at one time by using a transport ship. Each raft assembly 8 is bound with a buoy, a buoy rope passes through a sand quilt 7 and is fixed on the cross beam framework 6, and the buoy is arranged above the sand quilt 7. The sinking-discharging assembly 8 is hoisted to the sea surface by using a marine crane, and the buoy can ensure that the sinking-discharging assembly 8 is suspended within 30 centimeters of water depth from the sea surface. The first submerged row assembly 8 is connected with the pile foundation of the offshore wind power generation set by using a rope, and one end of the rope is sleeved on the offshore wind power pile 2 to prevent the rope from being washed away by water flow. And sequentially arranging other sinking row assemblies 8 around the pile foundation, and connecting the cross beam of the sinking row assembly 8 with the cross beam of the adjacent sinking row assembly 8 which is hoisted to the sea surface by using a rope when one sinking row assembly 8 is hoisted. The method is characterized in that a marine wind power pile 2 is used as a starting point, sinking row assemblies 8 are flatly laid around, the sinking row assemblies 8 are connected together through ropes, the sinking row assemblies 8 on the periphery of the marine wind power pile 2 are arranged next to the marine wind power pile 2 for a circle, the arrangement range of the sinking row assemblies 8 on one side of the marine wind power pile 2 in the tidal current direction is 5 times of the diameter of the marine wind power pile 2, and the arrangement range of the sinking row assemblies 8 on one side of the marine wind power pile 2 in the direction perpendicular to the tidal current direction is 3 times of the diameter of the marine wind power pile 2.
After the arrangement of all the sinking-raft assemblies 8 on the sea surface is finished, the whole scouring protection device 4 is slowly dragged on one side by the towing wheel, so that the sinking raft floating on the sea surface rotates by an angle by taking the offshore wind power pile 2 as a center, the angle is adjusted until the long edge of the whole scouring protection device 4 is parallel to the tidal current direction, then the connecting ropes of all the floats are untied, the floats are recovered, and the whole sinking-raft assemblies 8 connected together slowly sink into the water bottom under the action of gravity, thereby completing the arrangement construction of the pile foundation scouring protection device.
The principle of the utility model is as follows: the well-shaped beams are made of the raw wood to form the framework 6 for fixing the sand quilt 7, the sand quilt 7 can be ensured to be flatly spread without deformation, the well-shaped beam frameworks 6 are connected among the sinking-row components 8 through ropes, and the size of gaps among the sinking-row components 8 is ensured to be within an allowable range and the components are not overlapped. The cross beam made of the log has certain buoyancy and is matched with the weight of the sand quilt 7, so that the total gravity of the sinking-discharging assembly 8 is slightly larger than the buoyancy, the sinking speed of the sinking-discharging assembly 8 is controlled in the laying process, the sinking is prevented from being too fast, larger impact and vortex are avoided, and the operation time for releasing the floating rope is sufficient. By using the integral sinking method, the sinking and discharging assembly 8 can be ensured not to generate large deformation in the process of sinking to the seabed, and the whole scouring protection device 4 can be placed in place at one time by depending on the limit relation between the whole scouring protection device and the offshore wind power pile 2, so that the seabed 3 which is possibly scoured by the turbulent flow around the pile foundation around the offshore wind power pile 2 is completely covered, and the scouring protection effect is achieved.
It should be noted that the above description is only one of the embodiments of the present invention, and all equivalent changes made by the system described in the present invention are included in the protection scope of the present invention. The technical field of the present invention can be replaced by other embodiments described in a similar manner, without departing from the structure of the present invention or exceeding the scope defined by the claims, which belong to the protection scope of the present invention.
Claims (9)
1. The underwater pile foundation scouring protection device is characterized by comprising a plurality of sinking row assemblies (8) which are arranged in an array mode, wherein the adjacent sinking row assemblies (8) are connected with each other through flexible cables (5) and are laid on a seabed (3) around an offshore wind power pile (2);
the mattress sinking component (8) comprises a framework (6) and a sand quilt (7), and the sand quilt (7) is fixed on the framework (6).
2. Scour protection for underwater pile foundations according to claim 1, characterized in that for single-pile offshore wind piles (2), the total length of the row assembly (8) in the direction of the current is greater than 10 times the diameter of the offshore wind pile (2) and the total length in the direction perpendicular to the current is greater than 6 times the diameter of the offshore wind pile (2).
3. The underwater pile foundation scour protection device according to claim 1, wherein for the multi-pile offshore wind power pile (2), the equivalent pile foundation diameter is defined by the central distance between the two farthest piles plus the diameter of a single pile, the total length of the row sinking assembly (8) in the tidal current direction is greater than 10 times of the equivalent pile foundation diameter, and the total length in the vertical tidal current direction is greater than 6 times of the equivalent pile foundation diameter.
4. The underwater pile foundation scour protection as claimed in claim 1, wherein the area of the sand quilt (7) in the mattress assembly (8) is larger than the area of the framework (6).
5. The underwater pile foundation scour protection device according to claim 1, wherein the length of the flexible cables (5) between adjacent mattress sinking assemblies (8) is 5-15 cm.
6. The underwater pile foundation scour protection as claimed in claim 1, wherein the flexible cables (5) and the framework (6) are made of weather-resistant materials.
7. The underwater pile foundation scouring protection device of claim 1, wherein the framework (6) is of a cross beam structure, and a connecting hole for penetrating the flexible cable (5) is formed in the end part of each direction of the cross beam.
8. The underwater pile foundation scour protection device according to claim 1, wherein the buoyancy exerted on the submerged row assembly (8) when the submerged row assembly is completely submerged is 60% to 80% of the gravity of the submerged row assembly (8).
9. The underwater pile foundation scour protection as claimed in claim 1, wherein the lower surface of the framework (6) is planar.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023002982.8U CN214143832U (en) | 2020-12-14 | 2020-12-14 | Underwater pile foundation scouring protection device |
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| CN202023002982.8U CN214143832U (en) | 2020-12-14 | 2020-12-14 | Underwater pile foundation scouring protection device |
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| CN214143832U true CN214143832U (en) | 2021-09-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459131A (en) * | 2020-12-14 | 2021-03-09 | 华能灌云清洁能源发电有限责任公司 | Underwater pile foundation scouring protection device and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459131A (en) * | 2020-12-14 | 2021-03-09 | 华能灌云清洁能源发电有限责任公司 | Underwater pile foundation scouring protection device and construction method thereof |
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