CN217150336U - Offshore wind power single-pile foundation scouring protection and reinforcement structure - Google Patents

Offshore wind power single-pile foundation scouring protection and reinforcement structure Download PDF

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CN217150336U
CN217150336U CN202121429513.6U CN202121429513U CN217150336U CN 217150336 U CN217150336 U CN 217150336U CN 202121429513 U CN202121429513 U CN 202121429513U CN 217150336 U CN217150336 U CN 217150336U
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layer
sand
pile foundation
protection
rubble
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邱旭
张波
陈新明
杭兆峰
刘溟江
姚中原
邵瑞
张宇
李冬
陈佳志
陈磊
张竹砚
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Huaneng Clean Energy Research Institute
Clean Energy Branch of Huaneng International Power Jiangsu Energy Development Co Ltd Clean Energy Branch
Huaneng International Power Jiangsu Energy Development Co Ltd
Shengdong Rudong Offshore Wind Power Co Ltd
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Huaneng Clean Energy Research Institute
Clean Energy Branch of Huaneng International Power Jiangsu Energy Development Co Ltd Clean Energy Branch
Huaneng International Power Jiangsu Energy Development Co Ltd
Shengdong Rudong Offshore Wind Power Co Ltd
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    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/727—Offshore wind turbines

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Abstract

The utility model discloses an offshore wind power single pile foundation scouring protection reinforcing structure, which is arranged in a seabed through a rubble filling layer, the rubble filling layer can play a role in leveling the seabed, and simultaneously plays a role in reducing the amount of rubbles sinking into the seabed and reducing the engineering amount; the sand quilt filter layer can play a role in preventing sand in the lower seabed from reversely permeating; the gravel protective layer can improve the flushing starting flow speed and reduce the risk that the protective material is flushed away; the string bag rubble protection pier can play the effect of further improving single pile foundation bearing capacity. The four materials supplement each other to form a new protective structure, and a good scouring protection effect can be achieved. By adopting the graded broken stones, the quantity of the graded broken stones sinking into the seabed is ensured to be less, the volume of backfilling stones is reduced as much as possible, and then the lower seabed soil body is prevented from upwards permeating through the lower backfilling broken stone layer by the sand filter layer, so that the seabed soil body is lost, and the integral failure of the scouring protection device is caused.

Description

Offshore wind power single-pile foundation scouring protection and reinforcement structure
Technical Field
The utility model belongs to the technical field of offshore wind power engineering, concretely relates to offshore wind power single pile basis erodees protection reinforced structure.
Background
In the technical field of offshore wind power engineering, a large-diameter single-pile foundation is widely applied to offshore wind power engineering due to the advantages of simple structural form, convenience in manufacturing, high construction efficiency and the like. In the operation process of the single pile foundation, environmental factors such as waves and currents need to be borne. When the ocean current flows through the single-pile foundation, a vortex structure can be formed around the single-pile foundation, seabed soil bodies around the single-pile foundation can be taken away by the vortex, and then a scouring pit is formed around the single-pile foundation. The existence of the scouring pit can directly influence the bearing capacity of the single-pile foundation, and if the scouring pit is too large, the single-pile foundation can collapse and the like.
In order to prevent the surrounding of the single-pile foundation from being too large, materials such as sand quilt or throwing and filling stone materials and the like are usually paved around the single-pile foundation in engineering as a scouring protection measure immediately after the single-pile foundation is constructed. Over time, there is a significant probability of failure for the original single pile scour protection. When the original scouring protection measures fail, scouring pits still appear on the seabed of the single-pile foundation, the bearing capacity of the single-pile foundation is influenced, and the scouring protection measure reinforcement work needs to be carried out in time. The existing common scouring protection measure reinforcing method mostly adopts stone throwing and filling again, and has the problems of poor reinforcing effect, stone throwing and filling at regular time and repeatedly and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an offshore wind power single pile basis erodees protection reinforced structure to overcome prior art's not enough, the effect of protecting is better for erodeing after consolidating, and the reliability that erodees the safeguard measure after consolidating is higher, the durability is better.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an offshore wind power single pile basis erodees protection reinforced structure, including surrounding the gravel layer of backfilling that sets up in the single pile basis outside, sand by the filter layer, rubble armor layer and string bag rubble protection pier, it sets up in the seabed to fill the gravel layer, it sets gradually sand by filter layer and rubble armor layer to fill gravel layer upper end, string bag rubble protection pier sets up in rubble armor layer upper end, string bag rubble protection pier is located sea level upper end, backfill the gravel layer, sand is increased by lower supreme area by filter layer and rubble armor layer in proper order, string bag rubble protection pier area is less than rubble armor layer area.
Furthermore, graded broken stones are adopted in the backfill broken stone layer, and the density of the graded broken stones is not less than 2.65g/cm 3 。
Furthermore, the backfill plane of the backfill gravel layer is not lower than the seabed plane.
Furthermore, the sand quilt filter layer is made of a sand quilt, the sand quilt is evenly paved on the surface of the backfilled gravel layer, the thickness of the sand quilt is 30 cm-60 cm, and the plane paving range of the sand quilt is larger than that of the backfilled gravel layer.
Furthermore, the sand quilt body is made of non-woven fabrics, and the sand quilt is filled with natural sand.
Furthermore, the gravel protective layer adopts graded gravel, and the density of the graded gravel is not less than 2.65g/cm 3 。
Furthermore, the gravel protective layer is directly contacted with seawater, and the backfill elevation of the gravel protective layer is level to the elevation of the seabed.
Furthermore, the height difference of the backfill gravel layer is not more than 50 cm.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model relates to an offshore wind power single-pile foundation scouring protection reinforced structure, through surrounding the backfill rubble layer, the sand by the filter layer, rubble protective layer and the string bag rubble protection pier that set up in the single-pile foundation outside, the rubble layer sets up in the seabed, backfill rubble layer can play the effect of leveling to the seabed, play rubble simultaneously and sink into the seabed volume less, reduce the effect of engineering volume; the sand quilt filter layer can play a role in preventing sand in the lower seabed from reversely permeating; the gravel protective layer can improve the flushing starting flow speed and reduce the risk that the protective material is flushed away; the string bag rubble protection pier can play the effect of further improving single pile foundation bearing capacity. The four materials supplement each other to form a new protective structure, and a good scouring protection effect can be achieved.
Furthermore, by adopting graded broken stones, the quantity of the graded broken stones sinking into the seabed can be ensured to be less, the backfilling stone volume is reduced as much as possible, and then the lower seabed soil body is prevented from upwards permeating through the lower backfilling broken stone layer by the sand filter layer, so that the seabed soil body is lost, and the scouring protection device is integrally ineffective.
Furthermore, graded broken stones with the median diameter of 15cm are adopted, so that the quantity of the graded broken stones sinking into the seabed is small, and the backfill stone volume is reduced as much as possible.
Furthermore, backfill gravel layer, sand by the filter layer and rubble protective surface layer increase in proper order from bottom to top area, form the level protection, effectively avoid the sea water vortex to cause the loss of every layer of lower extreme structure building stones, improved reinforced structure's stability.
Drawings
Fig. 1 is a sectional view of the single-pile foundation scouring protection measure reinforcement scheme in the embodiment of the utility model.
FIG. 2 is a cross-sectional view of FIG. 1A-A
Fig. 3 is a plan view of a single net bag for breaking stones in the embodiment of the utility model.
Fig. 4 is a vertical view of a single string bag for breaking stones in the embodiment of the present invention.
In the figure, 1, a crushed stone layer is backfilled; 2. a sand quilt filter layer; 3. a stone-breaking protective surface layer; 4. the net bag gravel protecting pier; 5. and (5) single pile foundation.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
as shown in fig. 1 and 2, an offshore wind power single-pile foundation scouring protection and reinforcement structure comprises a backfill gravel layer 1 arranged on the outer side of a single-pile foundation 5 in a surrounding mode, sand is filtered by a filter layer 2, a gravel protective layer 3 and a net bag gravel protection abutment 4, the backfill gravel layer 1 is arranged in a seabed, the upper end of the backfill gravel layer 1 is sequentially provided with the sand which is filtered by the filter layer 2 and the gravel protective layer 3, the net bag gravel protection abutment 4 is arranged on the upper end of a sea level, the backfill gravel layer 1 is filled with the sand, the sand is sequentially increased by the filter layer 2 and the gravel protective layer 3 from bottom to top, and the area of the net bag gravel protection abutment 4 is smaller than the area of the gravel protective layer 3. And throwing and filling each layer of the reinforcing material within a specified range in a throwing and filling mode, and carrying out throwing and filling work on the next layer of the material after each layer is thrown and filled in place, and paving and filling in place layer by layer.
The material used for backfilling the gravel layer is graded gravel, specifically graded gravel with the median diameter of 15cm is adopted, and the density of the gravel is not less than 2.65g/cm 3 The crushed stone grading is shown in the following table 1. The backfill gravel layer is directly contacted with the seabed, and graded gravel with the median diameter of 15cm is adopted, so that the quantity of the graded gravel which sinks into the seabed is less, and the backfill gravel volume is reduced as much as possible. The backfill plane of the backfill gravel layer is not lower than the seabed plane, and the deep pit with larger depression is ensured to be filled and leveled as a reference. The graded broken stones are filled into the seabed in a pipeline conveying or direct throwing and filling mode. After the construction of the backfilled gravel layer is finished, the seabed is ensured to have a certain flatness so as to facilitate the construction of the sand filtering layer; the height difference of the backfill gravel layer is not more than 50 cm.
TABLE 1
Item Content providing method and apparatus Remarks for note
D r15 0.11m The diameter of 15% of the crushed stone per unit mass needs to be less than D r15
D r50 0.15m 50% of the crushed stone needs to have a diameter smaller than D r50
D r85 0.215 85% of the crushed stone needs to be smaller than D in unit mass r85
D r100 0.315m 100% of crushed stone needs to be smaller than D in unit mass r100
And on the basis of the completion of the construction of the backfilled gravel layer, carrying out the construction of a sand quilt filtering layer, wherein the sand quilt filtering layer is made of a sand quilt, and the sand quilt is uniformly paved on the surface of the backfilled gravel layer. The thickness of the sand quilt is 30 cm-60 cm, and the planar paving range of the sand quilt is larger than that of the backfilled gravel layer. The sand quilt filtering layer mainly has the function of preventing the lower seabed soil body from permeating upwards through the lower backfilling gravel layer, so that the seabed soil body is lost, and the scouring protection device is integrally ineffective. The sand quilt adopted by the sand quilt protective layer is hoisted to the seabed in a split construction mode through a hoist in a split mode, and all the sand quilts are required to be in close lap joint. The sand quilt body adopts non-woven fabrics, and the sand filled in the sand quilt adopts natural sand.
The material used for the macadam protective surface layer is graded macadam, and a middle position is adoptedGraded broken stone with the diameter of 53cm, and the density of the broken stone is not less than 2.65g/cm 3 The crushed stone grading is shown in the following table 2. The gravel protective layer is directly contacted with seawater, graded gravel with the median diameter of 53cm is adopted, the graded gravel can be prevented from being washed away by ocean current, and the overall stability of the washing protective structure is further ensured as far as possible. The backfill elevation of the gravel protective layer is level with the elevation of the seabed. The graded broken stones can be filled into the seabed in a pipeline conveying mode or a direct throwing and filling mode.
TABLE 2
Figure BDA0003133924850000041
Figure BDA0003133924850000051
As shown in fig. 3 and 4, the net bag gravel protective abutment is made of net bag gravel. The net bag crushed stones are formed in the net bag of the stone crushing device, and the net bag crushed stone protective pier is formed by arranging the net bag crushed stones. The plane geometric dimension of the net bag crushed stone is 2mX3m, and the thickness is 50 cm-100 cm. And hoisting the pile bags one by one to the upper gravel protective layer around the pile by a crane to form the string bag gravel protective pier.
The construction method for the scouring protection reinforced structure of the offshore wind power single-pile foundation comprises the following steps:
s1, filling a backfill gravel layer in the scouring pit body according to the fact that the single-pile foundation is located in the seabed scouring pit body, and enabling the backfill plane of the backfill gravel layer to be not lower than the seabed plane; ensuring the flatness of the backfilled gravel layer, wherein the height difference of the backfilled gravel layer is not more than 50 cm;
s2, sequentially arranging a sand filter layer and a gravel protective layer on the backfilled gravel layer, wherein the plane paving range of the sand is larger than that of the backfilled gravel layer;
specifically, the sand quilt adopted by the sand quilt protective layer is hoisted to the seabed in a split construction mode through a hoisting machine, and all the sand quilts are in close lap joint.
The graded broken stones of the broken stone protective layer can be filled into the seabed in a pipeline conveying mode or a direct throwing and filling mode.
S3, finally, arranging a string bag gravel protection pier on the gravel protective layer to form a stable protection structure.
The used material of string bag rubble protection pier is the string bag rubble, and specific through constitute the string bag rubble in with rubble device string bag, constitute string bag rubble protection pier through arranging of string bag rubble. The plane geometric dimension of the string bag crushed stone is smaller than the tiled area of the crushed stone protective layer, the plane geometric dimension of the string bag crushed stone is specifically 2mX3m, and the thickness of the string bag crushed stone is 50 cm-100 cm; and hoisting the pile bags one by one to the upper gravel protective layer around the pile by a crane to form the string bag gravel protective pier.
The utility model adopts four layers of different materials to form a scouring protection structure, and adopts graded broken stones, so that the quantity of the graded broken stones which sink into the seabed is less, the backfilling stone volume is reduced as much as possible, and then the sand is prevented by the filter layer from penetrating upwards through the lower backfilling broken stone layer, so that the seabed soil is lost, and the integral scouring protection device is failed; the gravel protective layer is directly contacted with seawater, so that the stability of the single-pile foundation at the sea level is improved, the existing washed foundation can be reinforced, and the reliability and durability of reinforcement are ensured. The gravel backfilling layer can play a role in leveling the seabed, and also plays a role in reducing the amount of gravel sinking into the seabed and reducing the engineering amount; the sand quilt filter layer can play a role in preventing sand in the lower seabed from reversely permeating; the gravel protective layer can improve the flushing starting flow speed and reduce the risk that the protective material is flushed away; the string bag rubble protection pier can play the effect of further improving single pile foundation bearing capacity. The four materials supplement each other to form a new protective structure, and a good scouring protection effect can be achieved.
The present invention is described in detail with reference to the preferred embodiments, and it should not be understood that the present invention is limited to the specific embodiments. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (8)

1. The utility model provides an offshore wind power single pile foundation scour protection reinforced structure, a serial communication port, including surrounding backfill metalling (1) that sets up in the single pile foundation (5) outside, sand is by filter layer (2), rubble protecting surface layer (3) and string bag rubble protection pier (4), backfill metalling (1) and set up in the seabed, backfill metalling (1) upper end sets gradually sand by filter layer (2) and rubble protecting surface layer (3), string bag rubble protection pier (4) set up in rubble protecting surface layer (3) upper end, string bag rubble protection pier (4) are located the sea level upper end, backfill metalling (1), sand is by filter layer (2) and rubble protecting surface layer (3) and is increased by lower supreme area in proper order, string bag rubble protection pier (4) area is less than rubble protecting surface layer (3) area.
2. The scouring protection and reinforcement structure for the offshore wind power single-pile foundation according to claim 1, wherein graded broken stones are adopted in the backfill broken stone layer, and the density of the graded broken stones is not less than 2.65g/cm 3 。
3. The erosion protection and reinforcement structure for the offshore wind power single-pile foundation according to claim 1, wherein a backfill plane of the backfill gravel layer is not lower than a seabed plane.
4. The scouring protection and reinforcement structure for the offshore wind power single-pile foundation according to claim 1, wherein the sand quilt is used as a sand quilt filter layer, the sand quilt is evenly paved on the surface of the backfilling gravel layer, the thickness of the sand quilt is 30 cm-60 cm, and the range of the sand quilt which is paved on the plane is larger than that of the backfilling gravel layer.
5. The erosion protection and reinforcement structure for the offshore wind and power single-pile foundation according to claim 4, wherein the sand quilt body is made of non-woven fabric, and the sand quilt is filled with natural sand.
6. The method of claim 1The offshore wind power single-pile foundation scouring protection reinforcing structure is characterized in that a graded broken stone is adopted as a broken stone protective layer, and the density of the graded broken stone is not less than 2.65g/cm 3 。
7. The erosion protection and reinforcement structure for the offshore wind power single-pile foundation according to claim 1, wherein the gravel protective layer is in direct contact with seawater, and the backfill elevation of the gravel protective layer is equal to the sea bed elevation.
8. The offshore wind power single-pile foundation scouring protection and reinforcement structure according to claim 1, wherein the height difference of a backfilled gravel layer is not more than 50 cm.
CN202121429513.6U 2021-06-25 2021-06-25 Offshore wind power single-pile foundation scouring protection and reinforcement structure Active CN217150336U (en)

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