Offshore single-pile foundation scouring pit protection structure

Abstract

The utility model provides an offshore single pile foundation scour pit protection structure which comprises gravels filled in a scour pit formed by a seabed around a single pile foundation, gaps of the gravels are filled with solidified soil, and the paving height of the gravels and the paving height of the solidified soil are both lower than the surface of the seabed around the scour pit. The gravel and the solidified soil jointly form a hardened whole-block-shaped protection structure, the hardened whole-block protection structure formed by combining the gravel and the solidified soil serves as a protection structure of the scouring pit and is not prone to being washed away by high-speed water flow, and the paving height of the gravel and the paving height of the picture are both lower than the seabed surface around the scouring pit. And secondary scouring can be obviously reduced, and the subsequent maintenance construction time and cost are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind farm engineering, in particular to an offshore single pile foundation scour pit protection structure. Background Art

[0002] Offshore wind power generation structures serve in open ocean areas. The upper wind turbines and tower structures cannot independently bear the responsibility of maintaining the safety and stability of the structure. Therefore, the lower foundation plays an irreplaceable and important role in the normal operation of the wind turbine. There are many types of foundations that support offshore wind power structures, mainly including pile foundations, barrel foundations, floating foundations, and gravity foundations. Among them, the single pile foundation in the pile foundation has the advantages of simple and efficient force transmission, excellent bending and shear resistance, and convenient construction conditions. It has gradually become the most widely used offshore wind power foundation selection.

[0003] However, setting up artificial structures such as pile foundations on the seabed will destroy the scouring and silting balance of the original seabed. The water flow around the pile body becomes turbulent and chaotic, and even forms vortices, which erode the seabed around the pile. Studies have shown that the flow rate after the pile foundation is built is up to 1. times higher than that without the pile foundation. Under the action of high-speed water flow, large scouring pits are easily formed around the piles, which reduces the depth of the piles into the soil and seriously endangers the safety and stability of offshore structures. Therefore, it is crucial to take anti-scouring protection measures. At present, the commonly used protection measures in engineering are riprap protection and sand blanket protection. Sand blanket protection measures are not suitable for deeper scouring pits. Riprap protection is simple to construct, but stones are easily carried away by high-speed water flow, which increases the cost of later maintenance. Therefore, exploring a new protection system has important practical significance. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide an offshore single pile foundation scour pit protection structure, which can solve the problem that stones in the riprap protection in the commonly used anti-scour measures are easily carried away by high-speed water flow and the subsequent maintenance cost is high.

[0005] To this end, the utility model adopts the following technical solutions:

[0006] An offshore single pile foundation scour pit protection structure comprises crushed stones filled in a scour pit formed by the seabed around the single pile foundation, the crushed stones are arranged around the single pile foundation in the scour pit, the gaps between the crushed stones are filled with solidified soil, the crushed stones and the solidified soil together constitute a hardened whole protection structure, and the height of the whole protection structure is lower than the seabed surface around the scour pit.

[0007] On the basis of adopting the above technical solutions, the present invention can also adopt the following further technical solutions, or use these further technical solutions in combination:

[0008] The particle size of the crushed stone ranges from 50 mm to 200 mm, wherein the median particle size of the crushed stone is 120 mm.

[0009] The solidified soil is higher than the laying height of the crushed stones and completely covers the upper layer of the crushed stones.

[0010] The height of the solidified soil filled in the center of the single pile foundation is higher than that filled at the edge of the scour pit. The height of the entire protective structure gradually decreases from the single pile foundation to the edge of the scour pit, forming a gentle slope with a high middle and low surroundings.

[0011] Compared with the prior art, the utility model has the following advantages and beneficial effects: the hardened whole protective structure after combining crushed stone and solidified soil is used as the protective structure of the scouring pit, which is not easily washed away by high-speed water flow, and the laying heights of crushed stone and solidified soil are lower than the seabed surface around the scouring pit. Compared with the traditional riprap system, it can significantly reduce secondary scouring, save subsequent maintenance construction time and cost, and is suitable for subsequent reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the scouring pit of the utility model.

[0013] Figure 2 It is a schematic diagram of a gravel-filled scour pit of the utility model.

[0014] Figure 3 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent elements with the same or similar functions. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as limitations on the present invention.

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0017] The utility model provides an offshore single pile foundation scour pit protection structure, comprising crushed stones 2 filled in a scour pit formed by the seabed around the single pile foundation 1, the crushed stones 2 are arranged around the single pile foundation 1 in the scour pit, the gaps between the crushed stones 2 are filled with solidified soil 4, the crushed stones 2 and the solidified soil 4 together form a hardened whole protection structure, and the height of the whole protection structure is lower than the seabed surface around the scour pit.

[0018] The filling height of the solidified soil 4 should be higher than the crushed stone 2, and the laying heights of the crushed stone 2 and the solidified soil 4 are both lower than the seabed surface around the scouring pit, and the final forming height of the above-mentioned protective structure is also slightly lower than the surrounding seabed surface.

[0019] The crushed stones 2 are dumped into the scouring pit by a riprap ship. A pipe 3 suspended from a pumping device is provided above the scouring pit, and the gaps between the crushed stones 2 are filled through the pipe 3 .

[0020] The solidified soil 4 is a fly ash-blast furnace slag based mixed material.

[0021] The particle size range of crushed stone 2 is 50 mm to 200 mm, and the median particle size of crushed stone 2 is 120 mm.

[0022] The solidified soil 4 is higher than the laying height of the crushed stones 2 and completely covers the upper layer of the crushed stones 2 .

[0023] The height of the solidified soil 4 filled in the center of the single pile foundation 1 is higher than that filled in the edge of the scour pit. The height of the entire protective structure gradually decreases from the single pile foundation 1 to the edge of the scour pit, forming a gentle slope with a high middle and low surroundings.

[0024] The solidified soil 4 is a hydraulically hardened cementitious structure that is initially fluid, and its interior is a collection of aggregates, bound water, and cementing materials. The solidified soil 4 can be hardened and formed within 2 hours after the construction is completed, forming a whole plate-shaped protective structure with the crushed stone 2.

[0025] The ratio of fly ash to blast furnace slag in the fly ash-blast furnace slag based mixed material is 3:7.

[0026] The best construction time for the above-mentioned protective structure is two hours before and after high tide and low tide, and construction should be avoided under extreme temperature conditions.

[0027] For scour pits located in deep sea areas, riprap vessels equipped with guide equipment are used to dump gravel at fixed points.

[0028] Before pumping the solidified soil material, use seawater to fill the pipeline to ensure that the pipeline is unobstructed. After ensuring that the seawater injection is unobstructed and there is no leakage, start pumping the fluidized solidified soil. When the solidified soil reaches the mud surface during grouting, the injection can be stopped. If the injection exceeds the amount (even if the solidified soil 4 is higher than the surrounding seabed surface), there is a risk of scouring around the protective structure.

[0029] The solidified soil material is in a fluid state at the beginning, which is convenient for pouring through a pumping pipeline. The interior of the solidified soil material is a collection of aggregates, bound water, and cementing materials. It can harden and form a whole board structure 2 hours after the construction is completed, and form a whole board structure with crushed stone.

[0030] According to the description and drawings of the utility model, those skilled in the art can easily manufacture or use the offshore single pile foundation scour pit protection structure of the utility model, and can produce the positive effects recorded in the utility model.

[0031] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two mechanisms, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0032] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "inside", "horizontal", "end", "length", "outer end", "left", "right" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the mechanism or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The terms "first" and "second" are also used only for the simplicity of description, and do not indicate or imply relative importance.

[0033] Furthermore, in practicing the claims of the present invention, those skilled in the art may understand and affect variations to the disclosed embodiments by studying the drawings, disclosure, and appended claims. In addition, in the claims and the specification, words such as "comprises", "comprising", etc. do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0034] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the present invention are covered by the scope of the claims of the present invention and will not be listed one by one here.

Claims

1. An offshore single pile foundation scour pit protection structure, characterized in that: The invention comprises crushed stones (2) filled in a scour pit formed by the seabed around a single pile foundation (1), wherein the crushed stones (2) are arranged around the single pile foundation (1) in the scour pit, and the gaps between the crushed stones (2) are filled with solidified soil (4). The crushed stones (2) and the solidified soil (4) together form a hardened whole protective structure, the height of the whole protective structure is lower than the seabed surface around the scour pit, the height of the solidified soil (4) filled in the center part of the single pile foundation (1) is higher than the height of the solidified soil (4) filled in the edge part of the scour pit, and the height of the whole protective structure gradually decreases from the single pile foundation (1) to the edge of the scour pit, forming a gentle slope with a high middle and low surroundings.

2. The offshore single pile foundation scour pit protection structure according to claim 1, characterized in that: The particle size of the crushed stone (2) ranges from 50 mm to 200 mm, wherein the median particle size of the crushed stone (2) is 120 mm.

3. The offshore single pile foundation scour pit protection structure according to claim 1, characterized in that: The solidified soil (4) is higher than the laying height of the crushed stone (2) and completely covers the upper layer of the crushed stone (2).

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