Bearing capacity enhanced pile foundation and offshore photovoltaic system

Abstract

The utility model belongs to the field of offshore pile foundations, and provides a pile foundation with enhanced bearing capacity and an offshore photovoltaic system. The bearing capacity enhanced pile foundation comprises a pile body, a fan-shaped wing plate, a spiral wing plate and a pile tip. The pile body is composed of a first pile section, a second pile section and a third pile section which are sequentially connected from top to bottom. The diameter of the second pile section is larger than that of the third pile section, and the diameter of the third pile section is larger than that of the first pile section. The two ends of the second pile section are connected with the first pile section and the third pile section through conical transition sections correspondingly. The fan-shaped wing plate is fixedly connected to the outer side of the second pile section; the spiral wing plate is fixedly connected to the outer side of the third pile section; the pile tip is fixed to the bottom of the third pile section in a closed mode. According to the bearing capacity enhanced pile foundation, the horizontal bearing capacity and the vertical bearing capacity of the pile foundation can be effectively improved at the same time.

Description

Technical Field

[0001] The utility model belongs to the field of offshore pile foundations, and in particular relates to a pile foundation with enhanced bearing capacity and an offshore photovoltaic system. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] The technical solution for offshore photovoltaic power generation is mainly fixed pile foundation. The depth of the pile foundation into the mud is generally controlled by the bearing capacity meeting the design requirements. Usually, the pile end enters the sandy soil layer as the bearing layer. However, since the surface layer of the offshore seabed mostly has a thick clay layer, if the sandy soil layer is used as the bearing layer, the pile length is generally longer; if the clay layer is used as the bearing layer, the pile diameter will increase significantly. Due to the huge number of pile foundations in offshore photovoltaic fields, the increase in the amount of pile foundation engineering will greatly reduce the return on investment. In addition, conventional pile foundations are generally constructed with hydraulic hammers, and it is difficult to control the initial verticality of the pile foundation. Once tilting occurs, it is necessary to stop the hammer and pull out the pile to correct the deviation. The construction cost is high, the cycle is long, and the noise is loud. Utility Model Content

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a bearing capacity enhanced pile foundation and an offshore photovoltaic system, which can effectively improve the horizontal and vertical bearing capacities of the pile foundation at the same time.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A first aspect of the utility model provides a pile foundation with enhanced bearing capacity.

[0007] A pile foundation with enhanced bearing capacity, comprising: a pile body, a fan-shaped wing plate, a spiral wing plate and a pile tip;

[0008] The pile body is composed of a first pile segment, a second pile segment and a third pile segment which are sequentially connected from top to bottom; the diameter of the second pile segment is larger than the diameter of the third pile segment, and the diameter of the third pile segment is larger than the diameter of the first pile segment; both ends of the second pile segment are respectively connected to the first pile segment and the third pile segment through a conical transition segment;

[0009] The fan-shaped wing plate is fixedly connected to the outer side of the second pile segment;

[0010] The spiral wing plate is fixedly connected to the outer side of the third pile segment;

[0011] The pile tip is closed and fixed at the bottom of the third pile section.

[0012] As an implementation manner, the second pile segment is arranged in a range below the seabed mud surface of 2 to 4 times the diameter of the third pile segment.

[0013] As an implementation mode, the angle between the fan-shaped wing plate and the horizontal plane is 45° to 60°.

[0014] As an embodiment, the number of the fan-shaped wing panels is at least three.

[0015] As an implementation manner, the fan-shaped wing plates are evenly arranged on the outer side of the second pile segment.

[0016] As an embodiment, the spiral wing plate adopts a plate strip of equal width to form a complete spiral.

[0017] As an implementation mode, the angle between the spiral wing plate and the horizontal plane is 30° to 45°.

[0018] As an embodiment, the number of the spiral wing plates is at least two.

[0019] As an implementation manner, the pile tip is in an inverted cone shape.

[0020] A second aspect of the present invention provides an offshore photovoltaic system.

[0021] An offshore photovoltaic system, comprising:

[0022] Photovoltaic panels; and

[0023] The pile foundation with enhanced bearing capacity as described above;

[0024] The photovoltaic panel is installed on the bearing capacity enhanced pile foundation.

[0025] The beneficial effects of the utility model are:

[0026] (1) The utility model improves the horizontal bearing capacity of the pile foundation by increasing the pile diameter and the fan-shaped wing plate within a certain range below the mud surface, and improves the vertical bearing capacity of the pile foundation by the spiral wing plate at the pile end, so that the horizontal and vertical bearing capacities of the pile foundation can be effectively improved at the same time regardless of whether the bearing layer of the pile foundation is in a clay layer or a sandy soil layer.

[0027] (2) The amount of steel structure engineering required for the wing plate and the pile section with a partially increased diameter of the utility model is less than the amount of steel structure engineering required for simply increasing the pile length and pile diameter; the construction process of the spiral wing plate at the pile end is simple, making it easy to control the initial verticality of the pile, and the pile is completed in one go to avoid rework. The construction process is noiseless, environmentally friendly, and has a short construction period.

[0028] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0030] Figure 1 It is an elevation view of a pile foundation with enhanced bearing capacity according to an embodiment of the utility model;

[0031] Figure 2 It is a three-dimensional stereogram of the bearing capacity enhanced pile foundation of the embodiment of the utility model.

[0032] Among them, 1. the first pile segment; 2. the second pile segment; 3. the third pile segment; 4. the fan-shaped wing plate; 5. the spiral wing plate; 6. the pile tip. DETAILED DESCRIPTION

[0033] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] Embodiment 1

[0037] according to Figure 1 and Figure 2 , this embodiment provides a pile foundation with enhanced bearing capacity, including: a pile body, a fan-shaped wing plate 4, a spiral wing plate 5 and a pile tip 6;

[0038] The pile body is composed of a first pile segment 1, a second pile segment 2 and a third pile segment 3 which are connected in sequence from top to bottom; the diameter of the second pile segment 2 is larger than the diameter of the third pile segment 3, and the diameter of the third pile segment 3 is larger than the diameter of the first pile segment 1; both ends of the second pile segment 2 are respectively connected to the first pile segment 1 and the third pile segment 3 through a conical transition section;

[0039] The fan-shaped wing plate 4 is fixedly connected to the outer side of the second pile segment 2;

[0040] The spiral wing plate 5 is fixedly connected to the outer side of the third pile segment 3;

[0041] The pile tip 6 is closed and fixed at the bottom of the third pile segment 3 .

[0042] The utility model solves the problem that under the condition that there is a thick clay layer on the seabed surface, the pile foundation bearing capacity of the offshore photovoltaic pile foundation with a clay layer as the bearing layer can also meet the design requirements, avoiding the problem of a significant increase in pile length and pile foundation engineering volume due to insufficient pile foundation bearing capacity; the pile foundation of the utility model can simultaneously improve the horizontal and vertical bearing capacity, and by improving the local structure of the pile foundation, the pile foundation bearing capacity is effectively improved, meeting the bearing capacity requirements of different calculation conditions.

[0043] The diameter of the second pile section 2 of the utility model is larger than that of the third pile section 3. After the pile foundation is installed in place, it is equivalent to playing a compacting role on the surface soil, which is beneficial to the horizontal resistance of the soil.

[0044] In the specific implementation process, all parts of the load-bearing capacity enhanced pile foundation of the utility model are made of steel structure. The first pile segment 1, the second pile segment 2 and the third pile segment 3 are prefabricated respectively and connected by welding.

[0045] In this embodiment, the second pile segment 2 is arranged below the seabed mud surface in a range of 2 to 4 times the diameter D of the third pile segment 3. A larger pile diameter increases the contact area between the pile foundation and the soil, and can drive more soil to resist the pile foundation when the pile foundation deforms horizontally. The horizontal bearing capacity of the pile foundation is approximately proportional to the diameter. For a pile foundation with a diameter of 800 mm, the fan-shaped wing plate adopts a plate strip of equal width. When 100 mm is taken, the horizontal bearing capacity can be increased by 25%. A larger diameter also increases the cross-sectional resistance moment of the pile foundation to resist the maximum bending moment below the mud surface, ensuring that the strength of the second pile segment meets the requirements.

[0046] In this embodiment, the angle between the fan-shaped wing plate 4 and the horizontal plane is 45° to 60°, which can reduce the resistance during construction drilling, while ensuring that the wing plate has as much projection area as possible in the vertical plane, further improving the horizontal bearing capacity of the pile foundation when the pile foundation deforms horizontally.

[0047] The number of the fan-shaped wing panels 4 is at least three, for example, the number of the fan-shaped wing panels can be four. Figure 1 and Figure 2 shown.

[0048] The fan-shaped wing plate 4 of this embodiment has sufficient strength to ensure that it will not yield and fail during the construction drilling process and when the pile foundation deforms horizontally. At the same time, the wing plate acts as a reinforcing rib for the second pile segment 2, so the wall thickness of the second pile segment 2 can be reduced.

[0049] When the number of the fan-shaped wing plates 4 is at least three, the fan-shaped wing plates 4 are evenly arranged on the outer side of the second pile segment 2. The fan-shaped wing plates 4 and the second pile segment 2 can be fixedly connected by welding.

[0050] In this embodiment, the spiral wing plate 5 is formed of a complete spiral with a plate strip of equal width. The angle between the spiral wing plate 5 and the horizontal plane is 30° to 45°. In this way, when the pile foundation is vertically deformed, it is equivalent to directly increasing the diameter of the pile foundation. The vertical bearing capacity of the pile foundation is proportional to the square of the diameter. For a pile foundation with a diameter of 600 mm, when the wing plate width is 100 mm, the vertical bearing capacity can be increased by 77%.

[0051] Wherein, the number of the spiral wing plates 5 is at least two.

[0052] The spiral wing plate 5 of this embodiment has sufficient strength to ensure that it will not yield and fail during the construction drilling process and when the pile foundation is vertically deformed. At the same time, the wing plate acts as a reinforcing rib for the third pile segment 3, so the wall thickness of the corresponding pile segment can be reduced.

[0053] In this embodiment, the pile tip 6 is in the shape of an inverted cone, which serves to close the pile end. The conical surface can reduce resistance during drilling and provide full-section pile end bearing capacity after the pile is installed in place.

[0054] The construction process of the bearing capacity enhanced pile foundation of this embodiment is as follows:

[0055] During construction, the top of the first pile section 1 is fixed to the pile driver, the pile tip 6 is placed at the designated pile position, and the pile tip 6 and the lower spiral wing plate 5 are gradually drilled into the soil by low-speed rotation. During the process, the verticality of the pile is monitored. Once deviation occurs, the pile driver applies a corrective force on the top of the first pile section 1 to adjust it. After the spiral wing plate 5 is completely inserted into the soil, it can be adjusted to a normal speed for drilling until the pile foundation is installed in place.

[0056] Embodiment 2

[0057] This embodiment provides an offshore photovoltaic system, which includes:

[0058] Photovoltaic panels; and

[0059] The pile foundation with enhanced bearing capacity as described in the first embodiment above;

[0060] The photovoltaic panel is installed on the bearing capacity enhanced pile foundation.

[0061] It should be noted here that, except for the bearing capacity enhanced pile foundation, other structures of the offshore photovoltaic system of this embodiment can be implemented by using existing structures, which will not be described in detail here.

[0062] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pile foundation with enhanced bearing capacity, characterized in that: include: Pile body, fan-shaped wing plate, spiral wing plate and pile tip; The pile body is composed of a first pile segment, a second pile segment and a third pile segment which are sequentially connected from top to bottom; the diameter of the second pile segment is larger than the diameter of the third pile segment, and the diameter of the third pile segment is larger than the diameter of the first pile segment; both ends of the second pile segment are respectively connected to the first pile segment and the third pile segment through a conical transition segment; The fan-shaped wing plate is fixedly connected to the outer side of the second pile segment; The spiral wing plate is fixedly connected to the outer side of the third pile segment; The pile tip is closed and fixed at the bottom of the third pile section.

2. The bearing capacity enhanced pile foundation according to claim 1, characterized in that: The range of the second pile segment below the seabed mud surface is 2 to 4 times the diameter of the third pile segment.

3. The bearing capacity enhanced pile foundation according to claim 1, characterized in that: The angle between the fan-shaped wing plate and the horizontal plane is 45° to 60°.

4. The bearing capacity enhanced pile foundation according to claim 1, characterized in that: The number of the fan-shaped wing panels is at least three.

5. The bearing capacity enhanced pile foundation according to claim 4, characterized in that: The fan-shaped wing plates are evenly arranged on the outer side of the second pile segment.

6. The bearing capacity enhanced pile foundation according to claim 1, characterized in that: The spiral wing plate adopts plate strips with equal width to form a complete spiral.

7. The bearing capacity enhanced pile foundation according to claim 1, characterized in that: The angle between the spiral wing plate and the horizontal plane is 30° to 45°.

8. The bearing capacity enhanced pile foundation according to claim 1, characterized in that: The number of the spiral wing plates is at least two.

9. The bearing capacity enhanced pile foundation according to claim 1, characterized in that: The pile tip is in an inverted cone shape.

10. An offshore photovoltaic system, characterized in that: include: Photovoltaic panels; and The bearing capacity enhanced pile foundation according to any one of claims 1 to 9; The photovoltaic panel is installed on the bearing capacity enhanced pile foundation.

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