Anti-scouring structure of steel pipe pile foundation

Abstract

The utility model discloses an anti-scour structure of a steel pipe pile foundation, which belongs to the technical field of anti-scour of steel pipe piles and is characterized in that the flow direction of fluid around a pile is regulated and controlled through an arc-shaped anti-scour plate, and downflow in front of the pile is guided to turn by the arc-shaped anti-scour plate before reaching mud. And finally, the fluid flows out from the terminal of the lower part of the arc surface of the arc-shaped impingement plate in a direction slightly higher than the horizontal plane, so that the soil body below the arc-shaped impingement plate is protected and the adverse effect of the fluid on the peripheral soil body is reduced. Meanwhile, in order to prevent eddy current still existing in fluid at the tail end of the arc-shaped impingement plate from scouring soil around the pile, flow-state solidified soil is further arranged on the outer side for surface treatment to stabilize the soil around the pile. Due to the scientific arrangement of the arc-shaped impingement plate, the area, the strength and the thickness required by the flow-state solidified soil can be greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe pile anti-scour technology, and in particular to an anti-scour structure for steel pipe pile foundations. Background Technology

[0002] With the rapid development of nearshore engineering construction, steel pipe pile foundations are widely used as the foundations for offshore wind turbines, offshore substations, oil and gas platforms, and wharves. However, pile foundations located in complex fluid environments are subject to complex flow fields such as downflow in front of the pile and horseshoe vortices, leading to scour pits in the soil around the pile. This increases the area of ​​the pile foundation exposed to fluid action and reduces its bearing capacity. Currently, methods such as riprap placement and scour protection plates are commonly used for pile foundation scour protection both domestically and internationally. However, existing methods also have many problems. For example, riprap or other material protection is eroded by water flow after a period of time under the influence of complex flow fields, losing its protective effect. While scour protection plates protect local areas around the pile from scour, new scour can easily occur at the outer edges of the protective plates. Utility Model Content

[0003] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a steel pipe pile foundation anti-scour structure, which can effectively prevent the steel pipe pile foundation from being scoured.

[0004] According to an embodiment of the present invention, the anti-scour structure for steel pipe pile foundation includes: an arc-shaped anti-scour plate, which is in the shape of an inwardly concave frustum, with a bent head at the upper end and a skirt at the lower end; a mounting connector, wherein the bent head is connected to the steel pipe pile through the mounting connector; and fluidized solidified soil, which is placed on the mud surface around the steel pipe pile, with the skirt extending downward into the fluidized solidified soil.

[0005] The anti-scour structure for steel pipe pile foundations according to this utility model embodiment has at least the following beneficial effects: The flow direction of fluid around the pile is controlled by the arc-shaped anti-scour plate. The downward flow in front of the pile is guided and redirected by the arc-shaped anti-scour plate before reaching the mud, and finally flows out at the lower end of the arc-shaped anti-scour plate in a direction slightly higher than the horizontal plane, protecting the soil below the arc-shaped anti-scour plate and reducing the adverse effects on the surrounding soil. Simultaneously, to prevent the eddy currents still present at the tail end of the arc-shaped anti-scour plate from scouring the soil around the pile, a fluidized solidified soil layer is installed on the outside for surface treatment to stabilize the soil around the pile. Due to the scientific design of the arc-shaped anti-scour plate, the required area, strength, and thickness of the fluidized solidified soil can be significantly reduced. The curved erosion barrier has a skirt at the tail end to ensure that fluid will not enter the protected area through the gap between the curved erosion barrier and the mud surface. Even if the fluidized solidified soil has a certain thickness of erosion, the fluid will not enter the protected area. At the same time, the skirt is angled and the corners are rounded, so that even if the skirt is exposed to the fluid to a certain extent, it can still guide the flow and reduce secondary erosion caused by the skirt obstructing the flow.

[0006] According to some embodiments of this utility model, the skirt edge is inclined downwards, the angle between the skirt edge and the mud surface is 30°, and the length of the skirt edge is greater than or equal to 500mm.

[0007] According to some embodiments of this utility model, the lower end of the arc surface of the arc-shaped anti-impact plate is curved upwards, and the angle between the tangent direction of the lower end arc surface of the arc-shaped anti-impact plate and the mud surface is 5°.

[0008] According to some embodiments of this utility model, the arc-shaped anti-impact plate is formed by splicing together sub-leaf and mother leaf, and the sub-leaf and mother leaf are connected by snap fasteners.

[0009] According to some embodiments of the present invention, the mother leaf is provided with a folded groove, the daughter leaf is provided with a fold that cooperates with the folded groove, and a rubber sealing strip is provided between the fold and the folded groove.

[0010] According to some embodiments of the present invention, the end of the folding groove is provided with an inwardly recessed inner bend, and the folded end is provided with an enlarged head. The inner bend and the enlarged head cooperate to lock the mother leaf and the daughter leaf together.

[0011] According to some embodiments of the present invention, the mounting connector includes a bracket base and a pin body. The bracket base is welded to the surface of the steel pipe pile, and the pin body is disposed on the bracket base. An installation groove is provided on the bracket base, and a pin is provided at the lower end of the pin body. The pin and the bent head are inserted together into the installation groove.

[0012] According to some embodiments of the present invention, the pin body is provided with a hammering port, and a bolt hole is provided on the hammering port. The bolt passes through the bolt hole and is installed between the bracket base, the pin body and the bending head.

[0013] According to some embodiments of this utility model, the distribution of the fluidized solidified soil is in a circular shape, and the top surface of the fluidized solidified soil is flush with the mud surface.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the anti-scour structure of the steel pipe pile foundation according to an embodiment of the present utility model;

[0017] Figure 2 yes Figure 1 Top view;

[0018] Figure 3 yes Figure 2 Cross-sectional view of the buckle connection of the arc-shaped anti-impact plate;

[0019] Figure 4 yes Figure 1 Enlarged cross-sectional view of the mounting connector in the middle;

[0020] Figure 5 yes Figure 4 A schematic diagram of the structure of the middle pin body.

[0021] Figure label:

[0022] 1. Arc-shaped anti-impact plate; 101. Bending head; 102. Skirt; 103. Sub-leaf; 104. Fluidized solidified soil; 2. Installation connector; 3. Steel pipe pile; 4. Mud surface; 5. Buckle; 6. Fold groove; 601. Fold up; 602. Inward bend; 603. Enlarged head; 604. Rubber sealing strip; 605. Bracket base; 7. Mounting groove; 701. Pin body; 8. Pin; 801. Hammering port; 802. Bolt hole; 803. Bolt; 9. Bolt. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] refer to Figures 1 to 5 This invention describes a steel pipe pile foundation anti-scour structure according to an embodiment of the present invention.

[0027] like Figures 1 to 5 As shown, the anti-scour structure for steel pipe pile foundation according to an embodiment of the present invention includes: an arc-shaped anti-scour plate 1, which is in the shape of an inwardly concave frustum, with a bending head 101 at the upper end and a skirt 102 at the lower end; a mounting connector 3, with the bending head 101 connected to the steel pipe pile 4 via the mounting connector 3; and fluidized solidified soil 2, which is disposed on the mud surface 5 around the steel pipe pile 4, with the skirt 102 extending downward into the fluidized solidified soil 2.

[0028] like Figure 1 As shown, the scour protection structure of this steel pipe pile foundation consists of three parts: an arc-shaped scour protection plate 1, a fluidized solidified soil 2, and installation connectors 3. The top of the arc-shaped scour protection plate 1 is connected to the steel pipe pile 4 via the installation connectors 3, and the lower part of the arc-shaped scour protection plate 1 is connected to the mud surface 5 and the fluidized solidified soil 2. The arc-shaped scour protection plate 1 has a frustum-shaped arc surface, and the top of the arc-shaped scour protection plate 1 is provided with a bending head 101, which is connected to the installation connectors 3. The lower end of the arc surface of the arc-shaped scour protection plate 1 is slightly upturned, and the tangent direction of the lower end arc surface forms a 5° angle with the mud surface 5; the tail of the arc-shaped scour protection plate 1 has a skirt 102, the length of which is not less than 500mm, and the skirt 102 extends downward into the fluidized solidified soil 2, forming a 30° angle with the mud surface 5.

[0029] like Figure 2 and Figure 3 As shown, the arc-shaped anti-impact plate 1 is divided into two leaves, which are connected by a buckle 6. One leaf is provided with a folding groove 601, and the other leaf is provided with a fold 602. The folding groove 601 has no sharp corners inside or outside, and the end is provided with an inward bend 603. The end of the fold 602 is provided with an enlarged head 604, and the fold 602 is wrapped with a rubber sealing strip 605. The cross-section of the rubber sealing strip 605 is "Ω" shaped.

[0030] like Figure 4 and Figure 5 As shown, the mounting connector 3 consists of a bracket base 7, a pin 8, and a bolt 9. The bracket base 7 is welded to the steel pipe pile 4 and is in the shape of an inverted "h," with an installation groove 701. The upper part of the cross-section of the pin 8 is a right-angled triangle, with its longer vertical right-angled side contacting the outer wall of the steel pipe pile 4, and its shorter horizontal right-angled side having a pin 801. The pin 8 is inserted into the installation groove 701 of the bracket base 7. The upper part of the pin 8 also has a hammering port 802, which has a horizontal working surface and a bolt hole 803. The bolt 9 can pass through this bolt hole to achieve a fixed connection between the pin 8, the arc-shaped anti-impact plate 1, and the bracket base 7.

[0031] like Figure 1 and Figure 2 As shown, the fluidized solidified soil 2 is generally in the shape of a ring, with the inner circle connected to the lower end of the arc surface of the arc-shaped anti-scouring plate 1. The ring width is 1 to 1.5 times the diameter of the steel pipe pile 4, and the top is flush with the mud surface 5. The thickness of the fluidized solidified soil 2 is 0.5 to 1.0 m.

[0032] The dimensions of the bracket base 7 for the installation connector 3 are determined based on the outer diameter of the steel pipe pile 4 being protected, ensuring that the inner diameter of the bracket base 7 is equal to the outer diameter of the steel pipe pile 4. The bracket base 7 can be made of bent strip steel and includes an installation groove 701. While the steel pipe pile 4 segments are being welded together in the factory, the bracket base 7 is securely welded to the outer wall of the steel pipe pile 4 at a specified height. This welding position is determined based on the designed embedment depth of the steel pipe pile 4 and the height of the arc-shaped anti-impact plate 1 in the installed state. Multiple threaded holes are pre-drilled on the outer edge of the installation groove 701 of the bracket base 7.

[0033] The dimensions of the arc-shaped anti-impact plate 1 are determined, and the arc-shaped anti-impact plate 1 is manufactured in a factory. Preferably, the height of the arc-shaped anti-impact plate 1 in the installed state can be 1 to 1.5 times the diameter of the steel pipe pile 4, and the width of the arc-shaped anti-impact plate 1 can be 1.5 to 2.0 times the diameter of the steel pipe pile 4. The arc-shaped anti-impact plate 1 is stamped using a special mold to form the designed arc surface, and a bending head 101 is bent into the upper part. Multiple bolt holes are reserved at the top of the bending head 101, and the number and position correspond one-to-one with the holes on the mounting groove 701. A skirt 102 with a width of not less than 500mm is stamped out at the lower part of the arc-shaped anti-impact plate 1, and it is ensured that the lower arc surface end of the arc-shaped anti-impact plate 1 is slightly upturned in the installed state, forming a 5° angle with the horizontal direction. At the edge connection of the two arc-shaped anti-impact plates 1, a folding groove 601 or a fold 602 is stamped out according to the upper and lower position of the blade.

[0034] Based on the dimensions of the arc-shaped anti-impact plate 1 and the mounting groove 701 of the bracket base 7, determine the dimensions of the pin body 8 of the mounting connector 3, including the length and width of the pin 801 and the height of the long right-angle side of the upper triangle in the cross-section of the pin body 8. The pin body 8 can be made into two or more arc-shaped components, which can eventually be assembled into a ring with the same inner diameter as the bracket base 7.

[0035] The steel pipe pile 4 is lifted and kept upright using a floating crane, with the mounting groove 701 of the bracket base 7 for the connector 3 facing upwards. A rubber sealing strip 605 is installed at the folded 602 of the sub-lobes 103 of the arc-shaped anti-impact plate 1. First, the sub-lobes 103 of the arc-shaped anti-impact plate 1 are lifted, and their bent heads 101 are placed into the mounting groove 701. Then, the mother lobe 104 of the arc-shaped anti-impact plate 1 is lifted, and its bent heads 101 are placed into the mounting groove 701, aligning with the bolt holes 9. The folded 602 of the sub-lobes 103 of the arc-shaped anti-impact plate 1 is inserted into the folded groove 601 of the mother lobe 104 of the arc-shaped anti-impact plate 1, forming a snap-fit ​​connection 6 between the two arc-shaped anti-impact plates 1. A pin 8 is inserted into the remaining space of the mounting groove 701, and the hammering port 802 of the pin 8 is hammered evenly around its perimeter to close all gaps. Bolts 9 are then tightened for secure fastening.

[0036] Based on the width of the arc-shaped scour protection plate 1 in its installed state, the implementation range of the fluidized solidified soil 2 is determined. The inner diameter of the annular band of the fluidized solidified soil 2 is equal to the diameter of the arc end of the arc surface of the arc-shaped scour protection plate 1, and the ring width is 1 to 1.5 times the diameter of the steel pipe pile 4. Based on the thickness of the fluidized solidified soil 2, a dredger is used to excavate the original mud surface within the range of the fluidized solidified soil 2. The steel pipe pile 4 with the arc-shaped scour protection plate 1 already installed is positioned on site and driven to the designated depth. At this point, the bottom of the arc end of the arc surface of the arc-shaped scour protection plate 1 contacts the mud surface 5, and the skirt 102 extends into the area where the fluidized solidified soil 2 is to be implemented. The fluidized solidified soil 2 is constructed to cover the skirt 102, and the surface of the fluidized solidified soil 2 is smoothed to complete the construction of the steel pipe pile foundation scour protection structure.

[0037] The scour protection structure of this steel pipe pile foundation uses an arc-shaped scour protection plate 1 to regulate the flow direction of fluid around the pile. The downward flow in front of the pile is guided and redirected by the arc-shaped scour protection plate 1 before reaching the mud surface 5, and finally flows out tangentially at a slightly higher angle (5°) above the horizontal plane at the lower end of the arc surface of the arc-shaped scour protection plate 1, protecting the soil below the arc-shaped scour protection plate 1 and reducing the adverse effects of the fluid on the surrounding soil. At the same time, to prevent the eddy currents of the fluid still present at the tail end of the arc-shaped scour protection plate 1 from scouring the soil around the pile, a fluidized solidified soil 2 is also installed in the outer area of ​​1 to 1.5 times the pile diameter for surface treatment to stabilize the soil around the pile. Due to the scientific design of the arc-shaped scour protection plate 1, the required area, strength, and thickness of the fluidized solidified soil 2 can be significantly reduced.

[0038] The tail of the arc-shaped erosion shield 1 has a skirt 102, which extends into the fluidized solidified soil 2 at a downward 30° angle. This ensures that fluid will not enter the protected area through the gap between the arc-shaped erosion shield 1 and the mud surface 5. Even if the fluidized solidified soil 2 has a certain thickness of erosion, the fluid will not enter the protected area. At the same time, the skirt 102 is angled and the corner is rounded. Even if the skirt 102 is exposed to the fluid to a certain extent, it can still guide the flow and reduce secondary erosion caused by the skirt 102 obstructing the flow.

[0039] The steel pile body can be welded and installed with connector 3 in the factory. The connector 3 has a pre-reserved installation groove 701. At the same time, the top of the arc-shaped anti-scour plate 1 is provided with a bending head 101, so that the arc-shaped anti-scour plate 1 can be easily and quickly inserted into the installation groove 701 and connected to the steel pipe pile 4 during on-site installation. It is also equipped with a pin plug 8 with a right-angled triangular cross-section at the top. The pin plug 8 helps to tighten the bending head 101 of the arc-shaped anti-scour plate 1, and the inclined surface design can achieve a smooth connection with the arc surface of the arc-shaped anti-scour plate 1, and also has a diversion function for the downward flow in front of the pile.

[0040] The curved anti-impact plate 1 is divided into two leaves, which facilitates assembly for waterborne construction operations. The design of the buckle 6 makes it very convenient to connect the two curved anti-impact plates 1 and achieve better joint sealing.

[0041] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A steel pipe pile foundation scour prevention structure, characterized in that, include: Arc-shaped anti-impact plate (1), the arc-shaped anti-impact plate (1) is in the shape of an inwardly concave frustum, the upper end of the arc-shaped anti-impact plate (1) is provided with a bending head (101), and the lower end of the arc-shaped anti-impact plate (1) is provided with a skirt (102); The installation connector (3) is used to connect the bent head (101) to the steel pipe pile (4). The fluidized solidified soil (2) is placed on the mud surface (5) around the steel pipe pile (4), and the skirt (102) extends downward into the fluidized solidified soil (2).

2. The anti-scour structure for steel pipe pile foundations according to claim 1, characterized in that, The skirt (102) is inclined downwards, the angle between the skirt (102) and the mud surface (5) is 30°, and the length of the skirt (102) is greater than or equal to 500mm.

3. The anti-scour structure for steel pipe pile foundations according to claim 1, characterized in that, The lower end of the arc surface of the arc-shaped anti-impact plate (1) is curved upwards, and the angle between the tangent direction of the lower end arc surface of the arc-shaped anti-impact plate (1) and the mud surface (5) is 5°.

4. The anti-scour structure for steel pipe pile foundations according to claim 1, characterized in that, The arc-shaped anti-impact plate (1) is formed by splicing together a sub-leaf (103) and a mother leaf (104), and the sub-leaf (103) and the mother leaf (104) are connected by a buckle (6).

5. The anti-scour structure for steel pipe pile foundations according to claim 4, characterized in that, The mother leaf (104) is provided with a folding groove (601), and the daughter leaf (103) is provided with a fold (602) that cooperates with the folding groove (601). A rubber sealing strip (605) is provided between the fold (602) and the folding groove (601).

6. The anti-scour structure for steel pipe pile foundations according to claim 5, characterized in that, The end of the fold (601) is provided with an inwardly recessed inner bend (603), and the end of the fold (602) is provided with an enlarged head (604). The inner bend (603) and the enlarged head (604) cooperate to lock the mother leaf (104) and the daughter leaf (103).

7. The anti-scour structure for steel pipe pile foundations according to claim 1, characterized in that, The mounting connector (3) includes a bracket base (7) and a pin body (8). The bracket base (7) is welded to the surface of the steel pipe pile (4). The pin body (8) is disposed on the bracket base (7). The bracket base (7) has an installation groove (701). The lower end of the pin body (8) is provided with a pin (801). The pin (801) and the bending head (101) are inserted together into the installation groove (701).

8. The anti-scour structure for steel pipe pile foundations according to claim 7, characterized in that, The pin body (8) is provided with a hammering port (802), and a bolt hole (803) is provided on the hammering port (802). The bolt (9) passes through the bolt hole (803) and is installed between the bracket base (7), the pin body (8) and the bending head (101).

9. The anti-scour structure for steel pipe pile foundations according to claim 1, characterized in that, The distribution of the fluidized solidified soil (2) is in a circular shape, and the top surface of the fluidized solidified soil (2) is flush with the mud surface (5).

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