阅读说明：本技术 具有防冲刷功能的海上风电基础 (Offshore wind power foundation with scour prevention function ) 是由 马文冠 刘鑫 郭小江 邱旭 白壮志 张震 罗震 于 2021-09-16 设计创作，主要内容包括：本发明提出了一种具有防冲刷功能的海上风电基础,包括桩基础和止挡条。桩基础上设置止挡条,止挡条的上表面设置有向下凹陷的凹槽,凹槽能够对沿着桩基础向下流动的下降流进行主动扰流,起到阻挡下降流的作用,改变下降流的流速和方向,起到了消能减冲的效果,抑制了马蹄型漩涡的形成,有效地保护桩基础周围的土体,避免冲刷坑的形成。与相关技术的抛石防护法相比,稳定性更强,防冲刷效果更好,可靠性更好。(The invention provides an offshore wind power foundation with an anti-scouring function. Set up the backstop strip on the pile foundation, the upper surface of backstop strip is provided with the recess of undercut, and the recess can be to the downcast along pile foundation downflow flow carry out initiative vortex, plays the effect that blocks the downcast, changes the velocity of flow and the direction of downcast, has played the energy dissipation and has subtracted the effect of dashing, has restrained the formation of horse shoe type swirl, protects the soil body around the pile foundation effectively, avoids scouring the formation in hole. Compared with the stone throwing protection method in the related art, the stone throwing protection method has the advantages of stronger stability, better anti-scouring effect and better reliability.)

1. The utility model provides an offshore wind power basis with scour prevention function which characterized in that includes:

a pile foundation including a first portion and a second portion interconnected in a length direction thereof, the second portion being buried in a seabed, the seabed having a seabed surface, the first portion being located above the seabed surface;

the stop strip is arranged on the outer peripheral surface of the first portion at least, the stop strip is arranged around the first portion, at least one part of the upper surface of the stop strip is recessed downwards to form a groove, and the extending direction of the groove is the same as the extending direction of the stop strip.

2. An offshore wind farm with an erosion protection function according to claim 1, characterized in that the trough wall surfaces of the groove comprise an inner wall surface close to the first section and an outer wall surface remote from the first section, the inner wall surface and the outer wall surface being opposite in radial direction of the first section.

3. Offshore wind energy foundation with scour protection according to claim 1, wherein the outside of the groove is open.

4. An offshore wind energy foundation with an erosion protection function according to claim 2 or 3, wherein at least a part of the groove wall surface of the groove is a downwardly concave cambered surface.

5. An offshore wind power foundation with an erosion protection function according to claim 1, wherein the distance between the lowest point and the highest point of the groove in the up-down direction is 1.0m-2.5 m.

6. Offshore wind foundation with scour protection according to claim 1, wherein the maximum width of the grooves in the radial direction of the first section is 1.0-2.5 m.

7. Offshore wind energy foundation according to claim 1, characterized in that said stop strip is annular and covers said first section.

8. The offshore wind power foundation with the anti-scouring function of claim 7, wherein the number of the stop bars is multiple, and the stop bars are arranged at intervals in the length direction of the pile foundation.

9. Offshore wind energy foundation according to claim 8, characterized in that the distance between two adjacent stop bars decreases towards the surface of the sea bed.

10. Offshore wind energy foundation with anti-scour function according to claim 1, wherein the stop bars are structured to match the shape of the grooves.

Technical Field

The application relates to the technical field of offshore wind power, in particular to an offshore wind power foundation with an anti-scouring function.

Background

Wind energy is increasingly regarded by human beings as a clean and harmless renewable energy source. Compared with land wind energy, offshore wind energy resources not only have higher wind speed, but also are far away from a coastline, are not influenced by a noise limit value, and allow the unit to be manufactured in a larger scale.

The offshore wind power foundation is the key point for supporting the whole offshore wind power machine, the cost accounts for 20-25% of the investment of the whole offshore wind power, and most accidents of offshore wind power generators are caused by unstable pile foundation. Due to the action of waves and tide, silt around the offshore wind power pile foundation can be flushed and form a flushing pit, the flushing pit can influence the stability of the pile foundation, and the collapse of an offshore wind power unit can be caused in serious cases. The anti-scouring device of the currently adopted offshore wind power pile foundation is mainly a riprap protection method. However, the integrity of the riprap protection is poor, and the maintenance cost and the workload in the application process are large.

Disclosure of Invention

The present invention is based on the discovery and recognition by the inventors of the following facts and problems:

due to the action of sea waves and tides, a phenomenon of scouring pits occurs around the foundation of the offshore wind power pile. The scouring phenomenon is a complex coupling process involving the interaction of water flow, sediment and structures. The main reason of scouring is that after the tide impacts the incident flow surface of the pile foundation, a downflow is generated and flows downwards along the incident flow surface of the pile foundation, a horseshoe vortex is generated near the surface of the sea bed and presents a downward winding and excavating vortex structure, the vortex structure winds up the sediment on the sea bed and further keeps away from the periphery of the pile foundation, and a digging and brushing effect is generated to form a scouring pit in front of the pile. The formation of the scour pit makes the depth of the pile foundation shallow, which causes the vibration frequency of the cylinder to be reduced, and causes the pile foundation to be over-fatigue if the cylinder is light, and causes the breakage accident if the cylinder is serious.

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides an offshore wind power foundation with an anti-scouring function.

According to the embodiment of the invention, the offshore wind power foundation with the anti-scouring function comprises: a pile foundation including a first portion and a second portion interconnected in a length direction thereof, the second portion being buried in a seabed, the seabed having a seabed surface, the first portion being located above the seabed surface; the stop strip is arranged on the outer peripheral surface of the first portion at least, the stop strip is arranged around the first portion, at least one part of the upper surface of the stop strip is recessed downwards to form a groove, and the extending direction of the groove is the same as the extending direction of the stop strip.

According to the offshore wind power foundation with the anti-scouring function, provided by the embodiment of the invention, the stop strip is arranged on the pile foundation, the upper surface of the stop strip is provided with the groove which is sunken downwards, the groove can actively disturb the downward flow flowing downwards along the pile foundation, the effect of stopping the downward flow is achieved, the flow speed and the direction of the downward flow are changed, the effects of energy dissipation and impact reduction are achieved, the formation of horseshoe-shaped vortexes is inhibited, the soil around the pile foundation is effectively protected, and the formation of scouring pits is avoided. Compared with the stone throwing protection method in the related art, the stone throwing protection method has the advantages of stronger stability, better anti-scouring effect and better reliability.

In some embodiments, the groove wall surface of the groove includes an inner wall surface close to the first portion and an outer wall surface distant from the first portion, the inner wall surface and the outer wall surface being opposed in a radial direction of the first portion.

In some embodiments, the outside of the groove is open.

In some embodiments, at least a portion of the groove wall surface of the groove is a downwardly concave curved surface.

In some embodiments, the distance between the lowest point and the highest point of the groove in the up-down direction is 1.0m-2.5 m.

In some embodiments, the maximum width of the groove in the radial direction of the first portion is 1.0m to 2.5 m.

In some embodiments, the stop bar is annular and surrounds the first portion.

In some embodiments, the stop bars are multiple, and the stop bars are arranged at intervals in the length direction of the pile foundation.

In some embodiments, the distance between two adjacent stop bars decreases towards the direction close to the surface of the sea bed.

In some embodiments, the stop bar is configured to match the shape of the groove.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a first schematic structural diagram of an offshore wind power pile-anti-settling composite foundation according to an embodiment of the invention.

Fig. 2 is a partially enlarged view of fig. 1.

Fig. 3 is a schematic structural diagram ii of an offshore wind power pile-anti-settling composite foundation according to an embodiment of the present invention.

Fig. 4 is a partially enlarged view of fig. 3.

Reference numerals:

the offshore wind power foundation comprises an offshore wind power foundation 1, a pile foundation 11, a first part 111, a second part 112, a stop bar 12, a groove 121, an inner wall surface 122, an outer wall surface 123, a groove bottom surface 124 and a sea bed surface 2.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

An offshore wind power foundation 1 with an anti-scour function according to an embodiment of the present invention is described below with reference to fig. 1-4, where the offshore wind power foundation 1 comprises a pile foundation 11 and a stop strip 12.

The pile foundation 11 comprises a first portion 111 and a second portion 112 connected to each other in its length direction, the second portion 112 being buried in the seabed. The seabed has a bed surface 2, a first section 111 above the bed surface 2 and a second section 112 below the bed surface 2. As will be appreciated by those skilled in the art, the conventional pile foundations 11 are hollow cylindrical structures.

The stop bar 12 is provided at least on the outer circumferential surface of the first portion 111, that is, a spoiler is provided at least on the first portion 111. The stopper bar 12 is disposed around the first portion 111, and at least a portion of an upper surface of the stopper bar 12 is recessed downward to form a groove 121, and the groove 121 extends in the same direction as the stopper bar 12.

The stop strip 12 plays a role in dissipating tidal energy through the groove 121, so as to achieve the purpose of active scour prevention, effectively protect the soil around the pile foundation 11, and avoid the formation of a scour pit. Specifically, because the stop bar 12 is arranged on the outer peripheral surface of the first part 111, the flow impact pile foundation forms a descending flow, the descending flow contacts the stop bar 12 in the downward flowing process, the descending flow impacts the groove 121 on the upper surface of the stop bar 12, the descending flow flows along the shape of the groove 121 and flows out of the groove 121, the flow speed and the direction are changed, the descending flow is prevented from flowing downward to reach the position near the sea bed surface to form a large horseshoe-shaped vortex, and the formation of the horseshoe-shaped vortex is restrained from the source. In addition, because the groove 121 blocks the downward flow, the effect of dissipating the energy of the downward flow can be achieved to a certain extent, the downward flow is prevented from impacting the seabed downwards, and the anti-scouring effect is achieved.

According to the offshore wind power foundation with the anti-scouring function, provided by the embodiment of the invention, the stop strip is arranged on the pile foundation, the upper surface of the stop strip is provided with the groove which is sunken downwards, the groove can actively disturb the downward flow flowing downwards along the pile foundation, the effect of stopping the downward flow is achieved, the flow speed and the direction of the downward flow are changed, the effects of energy dissipation and impact reduction are achieved, the formation of horseshoe-shaped vortexes is inhibited, the soil around the pile foundation is effectively protected, and the formation of scouring pits is avoided. Compared with the stone throwing protection method in the related art, the stone throwing protection method has the advantages of stronger stability, better anti-scouring effect and better reliability.

One embodiment provided by the present invention is described below by way of example with reference to fig. 1-4. For convenience of description, the following further describes the technical solution of the embodiment of the present invention by taking the length direction of the pile foundation 11 as the up-down direction, i.e. the axial direction of the pile foundation 11 extends along the up direction, and the up-down direction is shown by the arrow a in fig. 1.

As shown in fig. 1 and 2, the upper surface of the stopper bar 12 is recessed downward to form a groove 121, and a groove wall surface of the groove 121 includes an inner wall surface 122 close to the first portion and an outer wall surface 123 far from the first portion, the inner wall surface 122 and the outer wall surface 123 being opposed in the radial direction of the first portion 111. It is understood that the extending direction of the inner wall surface 122 and the outer wall surface 123 is the same as the extending direction of the groove 121.

In the present embodiment, the inner wall surface 122 and the outer wall surface 123 are both downwardly concave arc surfaces. Specifically, the inner wall surface 122 extends downward and outward from a position close to the first portion 111, and a bottom end of the inner wall surface 122 is located outside a top end thereof, that is, the bottom end of the inner wall surface 122 is farther from the first portion 111 than the top end thereof. The outer wall surface 123 extends downward and inward from a position away from the first portion 111, and the bottom end of the outer wall surface 123 is located inside the top end thereof, i.e., the bottom end of the outer wall surface 123 is closer to the first portion 111 than the top end thereof. In other embodiments, one of the inner wall surface 122 and the outer wall surface 123 may also be provided as a downwardly concave arc surface.

The downward flow contacts the wall surface of the groove 121 and flows along the arc-shaped wall surface, and then flows out from the top of the groove 121, so that the groove 121 changes the flow direction of the downward flow, and the downward flow is prevented from continuing to flow downward.

Further, as shown in fig. 2, the top end of the inner wall surface 122 is located above the top end of the outer wall surface 123, and in other embodiments, the top end of the inner wall surface 122 may be level with the top end of the outer wall surface 123 in the up-down direction.

In this embodiment, the groove 121 further includes a groove bottom surface 124, the groove bottom surface 124 is a plane, the bottom end of the inner wall surface 122 is connected to the inner side of the groove bottom surface 124, and the bottom end of the outer wall surface 123 is connected to the outer side of the groove bottom surface 124. In other embodiments, the groove bottom surface 124 may be a downwardly concave arc surface and engage with the inner wall surface 122 and the outer wall surface 123.

Alternatively, the distance between the lowest point and the highest point of the groove 121 in the up-down direction is 1.0m to 2.5m, in this embodiment, the lowest point of the groove 121 is the position of the groove bottom surface 124, and the highest point of the groove 121 is the position of the top end of the inner wall surface 122 (the top end of the outer wall surface 123). The distance between the lowest point and the highest point of the groove 121 in the up-down direction can also be regarded as the depth of the groove 121. So set up and to carry out the vortex effect to the downcast better, play the scour prevention effect. Further optionally, the distance between the lowest point and the highest point of the groove 121 in the up-down direction is 1m-2 m.

Optionally, the maximum width of the groove 121 in the radial direction of the first portion 11 is 1.0m to 2.5m, and in this embodiment, the maximum width of the groove 121 in the radial direction of the first portion 11 is the distance between the top end of the inner wall surface 122 and the top end of the outer wall surface 123 in the radial direction of the first portion 11, so that the downward flow can be better disturbed, and the anti-erosion effect is achieved. Further alternatively, the maximum width of the groove 121 in the radial direction of the first portion 11 is 1m-2 m.

In the present embodiment, the groove wall surface of the groove 121 is a concave arc structure, and the width of the groove 121 gradually decreases from top to bottom. The top of the groove 121 is completely open. In other embodiments, the groove wall surface of the groove 121 may also have a structure partially covering the groove 121, i.e., the maximum width position of the groove 121 is located between the top and the bottom of the groove 121.

In other embodiments, the outside of the groove 121 may be open, i.e., the groove wall surface of the groove 121 does not include an outer wall surface, only includes an inner wall surface and a groove bottom surface, or only includes an inner wall surface. Alternatively, in these embodiments, at least a part of the groove wall surface of the groove 121 is a downwardly concave arc surface. The downward flow contacts the groove wall surface of the groove 121 and flows along the arc-shaped groove wall surface, and flows out from the outside of the groove 121, and the groove 121 thus changes the flow direction of the downward flow, preventing the downward flow from continuing to flow downward.

As shown in FIG. 1, the stop bar 12 is annular and is disposed around the first portion 111. The number of the stopper bars 12 is plural, and the plural stopper bars 12 are arranged at intervals in the length direction of the pile foundation 11. The arrangement of the stop bars 12 can achieve a better turbulence effect, prevent descending of the downdraft and improve the anti-scouring performance of the offshore wind power foundation.

During the actual use of the offshore wind power foundation 1, the closer the position on the first section 111 to the sea bed surface 2 is, the greater the tidal current impact is, and the greater the possibility of generating horseshoe vortices is. Therefore, in some embodiments, the distance between two adjacent stop bars is reduced towards the direction close to the surface of the sea bed, so as to better deal with the actual situation and enhance the anti-scouring capability and the practicability of the offshore wind power foundation 1.

In some embodiments, the stop bar 12 is more preferably disposed on a portion of the first portion 111 near the seabed surface 2, or the stop bar 12 is disposed on at least a portion of the first portion 111 near the seabed surface 2, so as to achieve better anti-scour effect. The formation of the scour pit is mainly formed by downward flow moving down the length of the pile foundation 11, rolling up the sediment on the seabed near the pile foundation 11. Therefore, the stop strip 12 is arranged on the part of the first part 111 close to the seabed surface 2, so that the descending flow can be better ensured to contact the stop strip 12 and be stopped by the stop strip 12 in the descending process.

In other embodiments, the opposite end of the stopper bar 12 in the extending direction thereof is spaced apart from the other end thereof, i.e., the stopper bar 12 has a non-closed arc shape. The stop bars 12 include a plurality of stop bars 12, and the plurality of stop bars 12 are arranged at intervals along the length direction of the pile foundation 11 and arranged along the circumferential direction around the pile foundation 11, and it can also be said that the plurality of stop bars 12 are arranged at intervals on the outer circumferential surface of the first portion 111. Further, two adjacent stopper bars 12 in the length direction of the first portion 10 are staggered. Alternatively, two adjacent stopper bars 12 are staggered in the circumferential direction around the first portion 10. The irregularity of the stop bars 12 arranged on the first part 10 is increased, and the energy dissipation and impact reduction effects of the turbulent flow structure and the anti-scouring capacity of the offshore wind power foundation are enhanced.

Preferably, the structure of the stopper bar 12 matches the shape of the groove 121. As shown in fig. 4, in the present embodiment, the stopper bar 12 is made of a plate-like structure and has a constant thickness. The material of the stop bar 12 can be saved by the arrangement, the preparation difficulty of the stop bar 12 is reduced, and the structural reasonability of the stop bar 12 is improved.

Optionally, the stop bar 12 is welded to the first portion 111.

In some embodiments, as shown in fig. 1, a stop bar 12 is provided on a portion of the first section 111 adjacent to the deck surface 2. The tidal current strikes the upper portion of the first portion 111 to form a downward flow, which progresses downward along the outer circumferential surface of the pile foundation 11 and strikes the seabed. When the downflow reaches the part provided with the stop strip 12, the stop strip 12 can actively disturb the downflow, dissipate the energy of the downflow, change the flow direction of the downflow, and prevent the downflow from reaching the sea bed surface, or greatly reduce the impact force on the sea bed surface 2 when the downflow reaches the sea bed surface 2, so that the anti-scouring effect can be excellent.

Optionally, the outer diameter of the first portion 111 is D, and in the length direction of the pile foundation 11, the distance between the stop strip 12, which is arranged on the first portion 111 and farthest from the seabed surface 2, and the seabed surface 2 is greater than or equal to 1.0D.

In some embodiments, the stopper bar 12 is also disposed on the second portion 112, i.e., the second portion 112 is also provided with the stopper bar 12. Optionally, stop bar 12 on second portion 112 is positioned adjacent to deck surface 2 of second portion 112. Even form on the near sea bed face 2 of marine wind power basis 1 and erode the hole, the formation that erodes the hole makes the second part 112 that originally lies in below the sea bed face 2 expose, and the backstop strip 12 that sets up on the second part 112 can reduce effectively and erode the effect, prevents to erode the hole and continues downwardly extending, has strengthened the scour protection performance of marine wind power basis 1.

In some embodiments, the pile foundation 11 is one, i.e. the offshore wind power foundation 1 is an offshore wind power single pile foundation.

In other embodiments, the pile foundations 11 are multiple, that is, the offshore wind power foundation 1 is an offshore wind power multi-pile foundation, and the multiple pile foundations 11 are arranged at intervals.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.