Fusiform anti-scouring system

Abstract

A through hole is reserved in the center of the fusiform anti-scour system, a pile foundation is installed through the through hole, the system comprises a semi-fusiform shell, a bottom plate beam and geotechnical cloth, the direction of the semi-fusiform shell is set according to the water flow direction, and a plurality of grating beams are horizontally arranged at the top of the semi-fusiform shell; through the flow guide effect of the fusiform streamline side edges and the energy dissipation effect of the grating beams arranged on the top face, the flow field is weakened, and then scouring is prevented, the grating beams arranged on the top are used for supporting the semi-fusiform shell and serve as energy dissipation grids, and the bottom plate beams arranged at the bottom are used for supporting the semi-fusiform shell. And the geotechnical cloth is arranged at the bottom of the bottom plate beam.

Description

Technical Field

[0001] The utility model belongs to the field of offshore pile foundation engineering, in particular to a shuttle-shaped anti-scour system. Background Art

[0002] Loose sand and silt are common soil types in my country's offshore waters and rivers. These soils, due to their weak inter-particle bonding, are susceptible to scour and erosion by natural forces such as waves, tides, and wind. In these situations, pile foundations are widely used in marine engineering due to their strong bearing capacity, adaptability, stability, and ease of construction.

[0003] However, after the pile foundation is constructed, the movement of water particles caused by tides and waves will be significantly affected. First, a horseshoe vortex will form in front of the pile foundation; second, a vortex (Karman vortex street) will form at the backflow of the pile foundation; third, the streamlines on both sides of the pile foundation will shrink. This change in local flow pattern will increase the shear stress of the water flow on the bottom bed, thereby increasing the sand-carrying capacity of the water flow. If the bottom bed is susceptible to erosion, scour pits will form locally in the pile foundation, which will affect the stability of the pile foundation and threaten the safe life of the marine engineering.

[0004] There are two types of anti-scour measures for marine pile foundations: active protection and passive protection. Active protection is to weaken the flow field intensity by changing the local flow field characteristics, thereby reducing the sand-carrying capacity of the flow. Passive protection is to lay protective equipment on the seabed surface around the pile foundation to improve the anti-scour capacity of the seabed surface around the pile foundation. At present, passive protection is mostly used in marine engineering, mainly including anti-scour measures such as riprap, sand blankets (bags), solidified soil, chain rows, etc., in addition to bionic grass and other sediment-promoting methods. However, in actual engineering applications, even if the above-mentioned passive protection measures are adopted, due to improper management and control during construction and the difficulty of underwater supervision, most of them have problems such as inadequate protection and secondary scouring, and local scouring will still occur around the pile foundation. Summary of the Invention

[0005] In response to the above-mentioned problems, the present application provides a shuttle-shaped anti-scour system to achieve a combination of active protection and passive protection.

[0006] The technical solution is as follows:

[0007] A shuttle-shaped anti-scour system has a through hole reserved in the center of the system, and the pile foundation is installed through the through hole. The system includes a semi-shuttle-shaped shell, a bottom plate beam and a geotextile. The direction of the semi-shuttle-shaped shell is set according to the flow direction of the water. A number of grid beams are horizontally arranged on the top to support the semi-shuttle-shaped shell and serve as energy dissipation grids. The bottom plate beam is horizontally arranged on the bottom to support the semi-shuttle-shaped shell. The geotextile is arranged at the bottom of the bottom plate beam.

[0008] Furthermore, steel sheet piles are provided at the bottom of the system to improve the stability of the system.

[0009] Furthermore, the semi-shuttle-shaped shell, bottom plate beam and grid beam adopt reinforced concrete structure or steel structure.

[0010] Furthermore, the middle portion of the semi-shuttle-shaped housing is configured to be concave.

[0011] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0012] 1. The shuttle-shaped anti-scour system itself protects the area around the pile. The flow diversion effect of the shuttle-shaped streamlined side and the energy dissipation effect of the grid beam set on the top surface can weaken the flow field and thus prevent scour. At the same time, the top grid beam has a certain fish collection effect. This system can also serve as an artificial fishing reef.

[0013] 2. The shuttle-shaped anti-scour system is prefabricated on land and hoisted as a whole in the sea, so that the entire anti-scour system can be visualized, avoiding underwater construction by divers and difficulties in acceptance.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 It is a side elevation schematic diagram of a shuttle-shaped anti-scour system according to an embodiment.

[0017] Figure 2 It is a top view schematic diagram of a shuttle-shaped anti-scour system in an embodiment.

[0018] Figure 3 It is a schematic elevation view of a double-peaked shuttle-shaped anti-scour system according to an embodiment.

[0019] Figure 4 It is a front view schematic diagram of a shuttle-shaped anti-scour system in an embodiment.

[0020] In the figure: 1. Pile foundation; 2. Shuttle-shaped anti-scour system; 2-1. Semi-shuttle-shaped shell; 2-2. Grid beam; 2-3. Bottom plate beam; 2-4. Geotextile; 3. Steel sheet pile. DETAILED DESCRIPTION

[0021] Exemplary embodiments are described in detail herein, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numerals in different drawings represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with this application.

[0022] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0023] like Figure 1-Figure 4 As shown, an embodiment of the present application provides a shuttle-shaped anti-scour system 2, the center of which is reserved with a through hole, and the pile foundation 1 is installed through the through hole. The system may include a semi-shuttle-shaped shell 2-1, a bottom plate beam 2-3 and a geotextile 2-4. The direction of the semi-shuttle-shaped shell 2-1 is set according to the flow direction of the water. A plurality of grid beams 2-2 are horizontally arranged on the top for supporting the semi-shuttle-shaped shell 2-1 and serving as an energy dissipation grid. The bottom plate beam 2-3 is horizontally arranged on the bottom for supporting the semi-shuttle-shaped shell 2-1. The geotextile 2-4 is arranged at the bottom of the bottom plate beam 2-3 to further prevent the residual ocean current from scouring the seabed sediment around the pile foundation 1.

[0024] In a specific implementation, the line connecting the two vertices of the semi-shuttle-shaped shell 2 - 1 is parallel to the flow direction of the water flow, thereby achieving a better energy dissipation effect.

[0025] For seabeds with poor geology, steel sheet piles 3 can be set at the bottom of the shuttle-shaped anti-scour system 2. The steel sheet piles 3 penetrate the geotextile 2-4 and are connected to the bottom plate beams 2-3. When the shuttle-shaped anti-scour system 2 is sunk, it relies on its own gravity to press the steel sheet piles 3 into the mud to ensure its own stability.

[0026] The semi-shuttle-shaped shell 2-1, bottom plate beam 2-3 and grid beam 2-2 can adopt reinforced concrete structure or steel structure. In order to increase its own rigidity, weight and reduce cost, it is recommended to adopt reinforced concrete structure.

[0027] Because a through hole is reserved in the center of the system, the semi-shuttle-shaped shell 2-1 is actually a shuttle-shaped shell with low sides and a flat center. To enhance its energy dissipation, a concave lower surface can be used along the perimeter of the pile. For sea areas with larger calculated scour pits, a two-sided "peak" shuttle-shaped anti-scour system 2 can be used. This means that the shell still appears shuttle-shaped when viewed from above, but in plan, the surface is first concave and then convex, extending along the perimeter of the pile.

[0028] During construction, the shuttle-shaped anti-scour system 2 can be cast on land and transported to sea by transport ship for hoisting and lowering. Two construction methods are available: pre-pile driving and post-pile driving. Pre-pile driving involves first lowering the shuttle-shaped anti-scour system 2 to the sea surface after the pile foundation 1 is constructed normally. Post-pile driving involves first lowering the shuttle-shaped anti-scour system 2 to the sea surface, then inserting the pile foundation 1 through its pre-reserved center hole. The shuttle-shaped anti-scour system 2 also serves as a pile sinking guide, lowering the pile foundation 1 into place. Post-pile driving is recommended.

[0029] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the contents disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed in this application.

[0030] It will be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A shuttle-shaped anti-scour system, characterized in that: A through hole is reserved in the center of the system, and the pile foundation is installed through the through hole. The system includes a semi-shuttle-shaped shell, a bottom plate beam and a geotextile. The direction of the semi-shuttle-shaped shell is set according to the flow direction of the water. Several grid beams are set horizontally on the top to support the semi-shuttle-shaped shell and serve as energy dissipation grids. The bottom plate beam is set horizontally at the bottom to support the semi-shuttle-shaped shell, and the geotextile is set at the bottom of the bottom plate beam.

2. A shuttle-shaped anti-scour system according to claim 1, characterized in that: Steel sheet piles are set at the bottom of the system to improve the stability of the system.

3. The shuttle-shaped anti-scour system according to claim 1, characterized in that: The semi-shuttle shell, bottom plate beam and grille beam adopt reinforced concrete structure or steel structure.

4. The shuttle-shaped anti-scour system according to claim 1, characterized in that: The middle portion of the semi-shuttle-shaped housing is configured to be concave.

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