Spiral steel pipe pile for offshore photovoltaic power station

Abstract

The utility model relates to the field of pile foundations, and discloses a spiral steel pipe pile for an offshore photovoltaic power station, which sequentially comprises a reducing section, a transition section and a reinforcing section, the reducing section is in a quasi-cylinder shape or an equal-cylinder shape of which the radius is gradually reduced, and is arranged in a seabed foundation bed; the transition section is in the shape of a conical barrel and is gradually thickened from one end connected with the reducing section to one end connected with the reinforcing section; the reinforcing section is barrel-shaped; the reducing section is provided with a first spiral blade; the surface of the reducing section and the surface of the first spiral blade are coated with anti-corrosion coatings. According to the sectional design, the steel pipe pile can better adapt to the geological conditions of a seabed foundation bed, the cross sectional area of the reducing section is small, resistance is small, and construction is easy; the transition section is gradually thickened, so that downward drilling of the reinforcing section is facilitated, and stress concentration of the pile body is avoided; the reinforcing section increases the vertical bearing capacity of the upper part of the steel pipe pile and the horizontal rigidity of the structure; the spiral blades are additionally arranged on the reducing section, so that the vertical bearing capacity of the pile is enhanced; the anti-corrosion coating meets the anti-corrosion requirement of a marine scene.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pile foundation, concretely relates to a spiral steel pipe pile for offshore photovoltaic power station. BACKGROUND

[0002] Steel pipe pile is a common foundation form for supporting offshore photovoltaic support structure and offshore wind power structure, wherein vertical bearing capacity and horizontal displacement are main control factors of pile foundation design.

[0003] Steel pipe pile is generally designed into friction type pile due to large diameter and small wall thickness, and when the foundation condition is poor, the designed pile will be longer, and when the bedrock overburden is thin, it may involve pile foundation rock-embedding, so that the pile foundation has higher construction cost on the sea. The rigidity of the upper pile is the key to control the horizontal displacement of the foundation, and under the same area, increasing the pile diameter is easier to improve the pile rigidity than increasing the pile wall thickness, and simply increasing the pile diameter will make the lower pile stress ratio too small, causing waste of steel. SUMMARY

[0004] To solve the existing problems, the utility model provides a spiral steel pipe pile for offshore photovoltaic power station, which is reasonable in design and convenient to use, and aims at solving the problems of low vertical bearing capacity of traditional steel pipe pile pouring and too small lower pile stress ratio.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A spiral steel pipe pile for offshore photovoltaic power station comprises a reduced diameter section, a transition section and a reinforcing section in sequence; the reduced diameter section is in the shape of a quasi-cylinder or an equal cylinder with gradually decreasing radius, and is arranged in a seabed foundation; the transition section is in the shape of a conical cylinder, and gradually thickens from one end connected with the reduced diameter section to the other end connected with the reinforcing section; the reinforcing section is in the shape of a round barrel; the reduced diameter section is provided with first spiral blades; and the reduced diameter section and the first spiral blades are coated with a corrosion-resistant coating.

[0007] As a further improvement of the utility model, the reinforcing section is provided with second spiral blades.

[0008] As a further improvement of the utility model, the first spiral blades and the second spiral blades are one or more of single spiral, double spiral and multi-spiral.

[0009] As a further improvement of the utility model, the first spiral blades and the second spiral blades are one or more turns.

[0010] As a further improvement of the utility model, the reduced diameter section, the transition section and the reinforcing section are made of Q235 or Q355.

[0011] As a further improvement of the present application, the slope welding is used between the reduced diameter section and the transition section and between the transition section and the reinforcing section.

[0012] As a further improvement of the present application, the first spiral blade and the second spiral blade are left-handed or right-handed.

[0013] As a further improvement of the present application, the blades of the first spiral blade and the second spiral blade are one or more of steel plate, round steel, steel bar and steel bar.

[0014] As a further improvement of the present application, the first spiral blade and the second spiral blade are full-face type or belt type.

[0015] As a further improvement of the present application, the thickness of the anticorrosion coating is 500-1000 μm.

[0016] The present application has the following beneficial effects:

[0017] The device of the present application can better adapt to the geological conditions of the seabed foundation through the sectional design, the reduced diameter section has small cross-sectional area and small resistance, and is easy to construct; the transition section gradually thickens, which is more convenient for the reinforcing section to drill down, and at the same time avoids stress concentration of the pile body; the reinforcing section increases the vertical bearing capacity and the horizontal stiffness of the structure of the upper part of the steel pipe pile; the reduced diameter section is provided with spiral blades, which enhances the vertical bearing capacity of the pile; and the anticorrosion coating meets the anticorrosion requirements of the marine scene.

[0018] Preferably, the second spiral blade increases the contact area and friction force of the steel pipe pile with the surrounding seabed foundation, resists the horizontal force caused by waves, water flow and the like, thereby improving the lateral soil stiffness, horizontal bearing capacity, vertical compression resistance and uplift resistance of the steel pipe pile, and reducing the horizontal deformation of the pile.

[0019] Preferably, the spiral blade design of different forms can adjust the rotation effect and bearing capacity of the steel pipe pile according to actual needs, the single spiral is simple and practical, and has small rotation resistance; the double spiral or multiple spiral can provide higher bearing capacity and bending and torsional strength.

[0020] Preferably, the multiple spiral blades can increase the contact length of the steel pipe pile with the seabed foundation, improve the bearing capacity, and also help the stability of the steel pipe pile in the seabed foundation.

[0021] Preferably, the stainless steel material has excellent corrosion resistance and strength, can prolong the service life of the steel pipe pile, and improve the durability and service life of the overall structure.

[0022] Preferably, the slope welding can ensure the connection strength between the sections and the safety of the structure node.

[0023] Preferably, the spiral blades of different rotation directions can be selected according to the construction requirements to adapt to different geological conditions and construction stress requirements, and achieve the best fixing effect and bearing capacity.

[0024] Preferably, these materials have high strength and toughness, which can meet the stress requirements of the spiral blade during screwing in, and also help to reduce the cost.

[0025] Preferably, the full-face spiral blade can provide greater contact area and friction, while the belt spiral blade can reduce weight and cost while ensuring a certain bearing capacity.

[0026] Preferably, the corrosion-resistant coating can protect the steel pipe pile from tidal high-salt seawater erosion and corrosion, prolong the service life of the steel pipe pile, and improve the durability of the overall structure. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings described herein are for illustrative purposes only and do not limit the scope of the present disclosure in any way. In addition, the shapes and proportions of the components in the drawings are only illustrative and are used to help understand the present application, and are not specific limitations on the shapes and proportions of the components. In the drawings:

[0028] Figure 1 A three-dimensional schematic view of a spiral steel pipe pile for a marine photovoltaic power station according to Embodiment 1;

[0029] Figure 2 A three-dimensional schematic view of a spiral steel pipe pile for a marine photovoltaic power station according to Embodiment 2;

[0030] 1, reduced diameter section; 2, transition section; 3, reinforcing section; 4, first spiral blade; 5, second spiral blade. DETAILED DESCRIPTION

[0031] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0032] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Example 1

[0035] like Figure 1 As shown in this embodiment, a spiral steel pipe pile for an offshore photovoltaic power station includes a reduced-diameter section 1, a transition section 2, a reinforcing section 3, a first spiral blade 4, and a second spiral blade 5. The reduced-diameter section 1 is located at the lowermost end of the steel pipe pile, the reinforcing section 3 is located at the uppermost end, and the transition section 2 is located between the reduced-diameter section 1 and the reinforcing section 3. This segmented design allows the steel pipe pile to better adapt to the geological conditions of the seabed. The reduced-diameter section 1 has a small cross-sectional area and sidewall area, resulting in low frictional resistance, easy screwing in, and reduced engineering work. The gradually thickening transition section 2 provides better vertical bearing capacity and horizontal stiffness, contributing to uniform load distribution. The reinforcing section 3 increases the vertical bearing capacity at the top of the pipe pile. The addition of spiral blades to the reduced-diameter section 1 further enhances the overall structural strength and stability.

[0036] like Figure 1 As shown, the first helical blade 4 is located on the middle and lower surface of the reduced-diameter section 1, and the second helical blade 5 is located on the middle surface of the reinforcing section 3. Both the first helical blade 4 and the second helical blade 5 are right-handed and each has one revolution. The second helical blade 5 increases the contact area and friction between the steel pipe pile and the surrounding seabed, resisting horizontal forces caused by waves, water flow, etc., thereby improving the stiffness of the lateral soil, the horizontal bearing capacity, and the pull-out resistance of the steel pipe pile, and reducing the horizontal deformation of the pile.

[0037] The reduced diameter section 1, transition section 2, and reinforcing section 3 are all made of Q235 stainless steel.

[0038] The surface of the steel pipe pile is coated with an anti-corrosion coating. The first helical blade 4 and the second helical blade 5 are also coated with an anti-corrosion coating on their stainless steel surfaces. The anti-corrosion coating is a fluorocarbon anti-corrosion coating. The thickness of the anti-corrosion coating is 800 μm.

[0039] The diameter-reducing section 1 is a quasi-cylindrical shape with gradually decreasing radius, is arranged in the seabed foundation, and has a slope less than 1:5, which helps to screw into the seabed foundation; the transition section 2 is a conical cylindrical shape, which gradually thickens from the end connected to the diameter-reducing section 1 to the end connected to the reinforcing section 3; the reinforcing section 3 is a cylindrical shape; and the diameter-reducing section 1 is provided with first spiral blades. The diameter-reducing section 1, the transition section 2, and the reinforcing section 3 all have circular cross sections, which is conducive to reducing resistance and screwing into the soil.

[0040] The diameter-reducing section 1 and the transition section 2 are connected by bevel welding, and the transition section 2 and the reinforcing section 3 are connected by bevel welding. Bevel welding can ensure the connection strength between the sections and improve the stability and safety of the overall structure.

[0041] The first spiral blades 4 in the diameter-reducing section 1 are single spirals, and according to the force requirement, double spirals or multiple spiral blades can also be arranged; the second spiral blades 5 in the reinforcing section 3 are single spirals, and double spirals or multiple spiral blades can also be arranged, or no spiral blades are arranged. The arrangement of spiral blades can improve the bearing capacity, and the spiral steel pipe pile does not need to be placed into the seabed rock mass to improve adhesion and support. The blade surface of the spiral blade can be further provided with a wavy curved surface structure, which can increase the friction and stability between the steel pile and the seabed foundation, thereby improving the overall stability and durability. This curved surface structure design can reduce the vibration frequency of the pipe pile and the sliding speed of the material, enhance the anti-seismic and wind-resistant capacity of the building, and evenly distribute the weight to the spiral blades, reduce the influence of forces in different directions on the spiral blades and the pipe column material, and thereby enhance the overall bearing capacity of the structure. This design plays an important role in anti-seismic, wind-resistant, and reducing structural collapse.

[0042] The first spiral blades 4 and the second spiral blades 5 are made of steel plates with small pitch, and the steel pipe pile is screwed into the construction.

[0043] The first spiral blades 4 and the second spiral blades 5 are full-surface type.

[0044] In addition, the spiral steel pipe pile can not be provided with a transition section 2, i.e., the diameter-reducing section 1 and the reinforcing section 3 are arranged to have the same diameter.

[0045] Embodiment 2

[0046] The difference between this embodiment and Embodiment 1 is that the first spiral blades 4 and the second spiral blades 5 are made of steel bars or steel strips, as shown in FIG. 2. Figure 2 When the first spiral blades 4 and the second spiral blades 5 are steel bars or steel strips, the pitch is larger, the steel pipe pile can be driven into the construction, and the steel pipe pile is screwed into the construction by relying on the vertical force component.

[0047] The difference is that the first spiral blade 4 is located on the lower surface of the reduced diameter section 1, and the second spiral blade 5 is located on the upper surface of the reinforced section 3.

[0048] The difference is that the reduced diameter section 1, the transition section 2 and the reinforced section 3 all adopt Q355.

[0049] The anticorrosive coating is one of an epoxy anticorrosive coating, a polyurea elastomer anticorrosive coating or a zinc-rich coating.

[0050] The specific use principle is as follows:

[0051] According to the construction drawing, the installation point position is determined by using a positioning and measuring device.

[0052] The spiral steel pipe pile is hoisted into the pile foundation installation point by using a marine hoisting device.

[0053] The pile foundation device adjusts the perpendicularity, and the spiral steel pipe pile is sent in by multiple-point punching or rotation.

[0054] The upper photovoltaic or other equipment is erected on the upper part of the spiral steel pipe pile.

[0055] The above embodiment is only one of the implementation manners capable of realizing the technical scheme of the utility model, and the scope of the utility model claimed in the utility model is not limited by the embodiment, but also includes any changes, substitutions and other implementation manners easily thought of by any person skilled in the art within the technical range disclosed by the utility model. Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A spiral steel pipe pile for offshore photovoltaic power stations, characterized in that, It includes a reduced diameter section (1), a transition section (2), and a reinforcing section (3) in sequence; the reduced diameter section (1) is a quasi-cylindrical or equal-cylindrical shape with a gradually decreasing radius and is set in the seabed; the transition section (2) is a conical cylinder and gradually becomes thicker from one end connected to the reduced diameter section (1) to the other end connected to the reinforcing section (3); the reinforcing section (3) is cylindrical; the reduced diameter section (1) is provided with a first helical blade (4); the surfaces of the reduced diameter section (1) and the first helical blade (4) are coated with an anti-corrosion coating.

2. The spiral steel pipe pile for offshore photovoltaic power stations according to claim 1, characterized in that, The reinforcing section (3) is provided with a second helical blade (5).

3. A spiral steel pipe pile for an offshore photovoltaic power station according to claim 2, characterized in that, The first helical blade (4) and the second helical blade (5) are both one or more of single helical, double helical and multi-helical.

4. A spiral steel pipe pile for an offshore photovoltaic power station according to claim 2, characterized in that, The first helical blade (4) and the second helical blade (5) each have one or more turns.

5. A spiral steel pipe pile for an offshore photovoltaic power station according to claim 1, characterized in that, The reduced diameter section (1), transition section (2) and reinforced section (3) are all made of Q235 or Q355.

6. A spiral steel pipe pile for an offshore photovoltaic power station according to claim 1, characterized in that, The reduced diameter section (1) and the transition section (2) are welded together, as are the transition section (2) and the reinforcing section (3).

7. A spiral steel pipe pile for an offshore photovoltaic power station according to claim 2, characterized in that, The first helical blade (4) and the second helical blade (5) are both left-handed or right-handed.

8. A spiral steel pipe pile for an offshore photovoltaic power station according to claim 2, characterized in that, The blades of the first helical blade (4) and the second helical blade (5) are one or more of steel plates, round steel bars, steel strips and reinforcing bars.

9. A spiral steel pipe pile for an offshore photovoltaic power station according to claim 2, characterized in that, The first helical blade (4) and the second helical blade (5) are one or more of the full-surface type or the belt type.

10. A spiral steel pipe pile for an offshore photovoltaic power station according to claim 1, characterized in that, The thickness of the anti-corrosion coating is 500–1000 μm.

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