Wind power double-layer concrete structure composite single pile foundation applied to deep and far sea

Abstract

The utility model discloses a double-layer concrete structure composite single pile foundation applied to deep sea wind power, which relates to the technical field of offshore wind power and comprises a concrete bearing platform positioned at the upper part, a foundation support rod in the middle, a concrete ring beam positioned at the lower part and a single-cylinder pile foundation positioned at the bottom of the concrete ring beam, the upper ends of the foundation supporting rods are inserted into the concrete bearing platform and anchored through the top anchoring plates, the lower ends of the foundation supporting rods penetrate through the concrete ring beam and anchored at intervals through the multiple bottom anchoring plates, and the upper ends of the single-cylinder pile foundations are inserted into the concrete ring beam and flush with the top face of the concrete ring beam. The upper end and the lower end of the foundation supporting rod are restrained by concrete, the size of the foundation supporting rod can be determined according to the water depth condition, the risks of overall instability, buckling and the like of the foundation supporting rod are reduced, the foundation supporting rod is a round pipe, no rod piece joint point exists, and the fatigue problem is small.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore wind power, in particular to a composite single-pile foundation with a double-layer concrete structure applied to deep and far-reaching offshore wind power. Background Art

[0002] With the development of nearshore wind power, it is bound to develop towards deep and far-reaching offshore areas in the future. The cost of floating wind turbine foundations is relatively high, and the cost of jacket foundations is also high due to the large number of joints. For traditional pile cap foundations, due to the excessive length of steel pipe piles and the position of the embedment point on the mud surface, the problem of steel pipe pile cantilever is relatively prominent, and there are overall and local stability problems with steel pipe piles, which are not suitable for deep water areas. Moreover, for offshore cast-in-situ concrete pile cap foundations, the construction period is long, while the actual construction window period at sea is short, so the cost is extremely high. The single-pile foundation has low self-rigidity, and when the water depth is too deep, its weight is too large. After exceeding 3000t, the existing ship and machine equipment are all limited. The suction foundation has relatively high requirements for geological conditions, and the suction foundation structure cannot be used in some areas. Therefore, it is imperative to study new types of wind turbine foundations suitable for deep and far-reaching offshore wind farms. Content of the Utility Model

[0003] In order to solve the above problems, the utility model provides a composite single-pile foundation with a double-layer concrete structure applied to deep and far-reaching offshore wind power.

[0004] The utility model is realized through the following technical solutions.

[0005] A composite single-pile foundation with a double-layer concrete structure applied to deep and far-reaching offshore wind power includes a concrete pile cap at the upper part, a foundation support rod in the middle, a concrete ring beam at the lower part, and a single-tube pile foundation at the bottom of the concrete ring beam. The upper end of the foundation support rod is inserted into the concrete pile cap and is anchored by a top anchor plate at the end. The lower end penetrates through the concrete ring beam and is anchored at intervals by multiple bottom anchor plates. The upper end of the single-tube pile foundation is inserted into the concrete ring beam and is flush with the top surface of the concrete ring beam.

[0006] Further, the concrete pile cap is of a circular or polygonal structure, and the polygonal structure includes a hexagon, an octagon, etc.

[0007] Further, the top anchor plate is used to increase the contact area between the foundation support rod and the upper concrete pile cap, and enhance its punching shear resistance;

[0008] The bottom anchor plate increases the bonding ability between the foundation support rod and the lower concrete ring beam, and reduces the risk of the concrete ring beam and the foundation support rod coming apart;

[0009] The top anchor plate and the bottom anchor plate are welded to the foundation support rod and are integral with the foundation support rod. The concrete is cast-in-situ and is naturally anchored;

[0010] The number of bottom anchor plates can be 2 to 3, and they can be arranged at equal intervals or unequal intervals.

[0011] Furthermore, the foundation support rods are arranged in pairs in a "V" shape or in a "V" shape, increasing the foundation's flexural resistance.

[0012] Furthermore, a vertical ring with an annular cavity that penetrates the concrete ring beam is reserved inside the concrete ring beam. The upper end of the single-tube pile foundation is inserted into the annular cavity and grouted to connect the single-tube pile foundation to the concrete ring beam.

[0013] Furthermore, a guide plate is reserved at the bottom of the ring reserved in the concrete ring beam, reducing the difficulty of hoisting the structure.

[0014] Furthermore, a wind turbine tower is arranged on the top of the concrete pile cap. The wind turbine tower is connected to the concrete pile cap through a wind turbine tower connection flange, and the concrete pile cap and the wind turbine tower connection flange are connected as a whole through high-strength prestressed bolts.

[0015] The beneficial effects of the present utility model are:

[0016] 1. Both the upper and lower ends of the foundation support rods are constrained by concrete, and their dimensions can be determined according to the water depth, reducing the risks of overall instability and buckling. Moreover, the foundation support rods are round tubes without rod joints, and the fatigue problem is relatively small.

[0017] 2. The concrete pile cap, concrete ring beam, and foundation support rods are all constructed on land to form a double-layer concrete structure composite single-pile foundation structure above the mud surface, and are transported to the site as a whole, reducing the offshore construction operation cycle.

[0018] 3. The concrete pile cap is constructed on land, and the quality is controllable, reducing the risks of offshore construction operations.

[0019] 4. The single-tube pile foundation only exposes 4 to 8 m above the mud surface (the length inserted into the concrete ring beam). The double-layer concrete structure composite single-pile foundation is light in weight and the construction difficulty is reduced. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the double-layer concrete structure composite single-pile foundation of the present utility model;

[0021] Figure 2 is a top view of the concrete pile cap of the double-layer concrete structure composite single-pile foundation in Embodiment 1 (hexagonal concrete pile cap);

[0022] Figure 3 is an arrangement diagram of the support rods of the double-layer concrete structure composite single-pile foundation and the concrete ring beam in Embodiment 1 (the foundation support rods are arranged in pairs in a "V" shape);

[0023] Figure 4 It is the top view of the concrete pile cap of the double - layer concrete structure composite single - pile foundation in Embodiment 2 (circular concrete pile cap);

[0024] Figure 5 It is the layout diagram of the support rod and the concrete ring beam of the double - layer concrete structure composite single - pile foundation in Embodiment 2 (the foundation support rods are arranged in pairs in a "V" shape).

[0025] In the figure: 1. Concrete pile cap; 2 - 1. Foundation support rod; 2 - 2. Top anchor plate; 2 - 3. Bottom anchor plate; 3. Concrete ring beam; 4. Single - tube pile foundation; 5 - 1. Wind turbine tower; 5 - 2. Wind turbine tower connection flange; 5 - 3. High - strength prestressed bolt; 6. Ring; 7. Reserved guide plate. Specific implementation manners

[0026] The following further explains the structures involved in the present utility model or the technical terms used therein. These explanations are only given by way of example to illustrate how the present utility model is implemented and shall not constitute any limitation to the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left" and "right" etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated positions or elements must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a direct connection or an indirect connection through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present utility model can be understood according to specific circumstances.

[0029] Embodiment 1

[0030] Combined with Figure 1 、 Figure 2 and Figure 3As shown in the figure, this embodiment is a double - layer concrete - structure composite single - pile foundation applied to deep - sea and far - sea wind power, including a concrete cap 1, foundation support rods 2 - 1, a concrete ring beam 3, and a single - tube pile foundation 4. The concrete cap 1 is a hexagonal concrete cap, which connects 6 foundation support rods 2 - 1 into a whole. An anchor plate 2 - 2 is arranged at the top of the foundation support rod 2 - 1 to increase the connectivity between it and the concrete cap 1. The bottom of the foundation support rod 2 - 1 is restricted by the concrete ring beam 3. Three equally - spaced bottom anchor plates 2 - 3 are arranged at the bottom of the foundation support rod 2 - 1 to strengthen the connection between the foundation support rod 2 - 1 and the concrete ring beam 3. The foundation support rod 2 - 1 is a circular tube without rod joints.

[0031] The concrete cap 1, the concrete ring beam 3, and the foundation support rod 2 - 1 are all constructed on land to form the structure above the mud surface of the double - layer concrete - structure composite single - pile foundation.

[0032] A circular ring 6 that vertically penetrates the concrete ring beam 3 is reserved inside the concrete ring beam 3. The upper end of the bottom single - tube pile foundation 4 is inserted into the circular ring 6 with an annular cavity, and the cavity between the circular ring 6 and the single - tube pile foundation 4 is grouted to connect the single - tube pile foundation 4 and the concrete ring beam 3. The lower end is inserted into the mud and is used to support the structure above the mud surface of the double - layer concrete - structure composite single - pile foundation. The thickness of the annular cavity of the circular ring 6 is much larger than the thickness of the single - tube pile foundation 4, which is convenient for the insertion of the single - tube pile foundation 4.

[0033] The size of the single - tube pile foundation 4 is determined according to the upper load. Since the single - tube pile foundation 4 is located below the mud surface, its weight is reduced by 1 / 2 compared with the current single - pile foundation.

[0034] During construction, first sink the single - tube pile foundation 4 into place, and then lift and place the structure above the mud surface of the double - layer concrete - structure composite single - pile foundation into place. The single - tube pile foundation 4 and the structure above the mud surface of the double - layer concrete - structure composite single - pile foundation are connected by grouting. A guide plate 7 is reserved at the bottom of the circular ring 6 reserved in the concrete ring beam 3 to reduce the difficulty of lifting and placing the structure.

[0035] A wind turbine tower barrel 5 - 1 is arranged on the top of the concrete cap 1. The wind turbine tower barrel 5 - 1 and the concrete cap 1 are connected by a wind turbine tower barrel connection flange 5 - 2, and the concrete cap 1 and the wind turbine tower barrel connection flange 5 - 2 are connected into a whole by high - strength prestressed bolts 5 - 3.

[0036] To reduce the overall engineering quantity of the structure and increase the structural stability, the surface area of the upper concrete cap 1 is smaller than the surface area of the lower concrete ring beam 3. The foundation support rods 2 - 1 are arranged in pairs in a "V" shape to increase the bending resistance of the foundation. Every two foundation support rods 2 - 1 form a unit, and a total of 3 groups of units are evenly arranged.

[0037] Embodiment 2

[0038] Combined with Figure 4 、 Figure 5As shown, on the basis of Embodiment 1, the concrete pile cap 1 is a circular concrete pile cap, and 8 foundation support rods 2-1 are used. The bottoms of the foundation support rods 2-1 are evenly arranged on the concrete ring beam 3, and the foundation support rods 2-1 are arranged in a pair in a "V" shape.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-layer concrete structure composite single pile foundation for deep sea wind power, characterized by: It includes a concrete pedestal at the top, a foundation support rod in the middle, a concrete ring beam at the bottom and a single-tube pile foundation at the bottom of the concrete ring beam. The upper end of the foundation support rod is inserted into the concrete pedestal, the end is anchored by a top anchor plate, the lower end passes through the concrete ring beam, and is anchored at intervals by multiple bottom anchor plates. The upper end of the single-tube pile foundation is inserted into the concrete ring beam and is flush with the top surface of the concrete ring beam.

2. The double-layer concrete structure composite single pile foundation for deep sea wind power according to claim 1 is characterized in that: The concrete cap is a circular or polygonal structure.

3. The double-layer concrete structure composite single pile foundation for deep sea wind power according to claim 1 is characterized in that: The basic support rods are arranged in pairs in a "V" shape, or the basic support rods are arranged in pairs in an "eight" shape.

4. The double-layer concrete structure composite single pile foundation for deep sea wind power according to claim 1 is characterized in that: A circular ring with an annular cavity is reserved inside the concrete ring beam and vertically penetrates the concrete ring beam. The upper end of the single-tube pile foundation is inserted into the annular cavity and grouted to connect the single-tube pile foundation with the concrete ring beam.

5. The double-layer concrete structure composite single pile foundation for deep sea wind power according to claim 4 is characterized in that: A guide plate is reserved at the bottom of the circular ring of the concrete ring beam.

6. The double-layer concrete structure composite single pile foundation for deep sea wind power according to claim 1 is characterized in that: A wind turbine tower is arranged on the top of the concrete pedestal, and the wind turbine tower is connected to the concrete pedestal via a wind turbine tower connecting flange, and the concrete pedestal and the wind turbine tower connecting flange are connected as a whole via high-strength prestressed bolts.

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