Deepwater steel pipe pile cofferdam and construction method thereof

Abstract

This invention provides a deep-water steel pipe pile cofferdam and its construction method, belonging to the field of cofferdam technology. It includes an internal support structure, several piles, and several connecting structures. The connecting structures include a locking joint, a limiting joint, a locking head, a limiting head, and a drainage outlet. This deep-water steel pipe pile cofferdam and its construction method employs a simple locking joint and locking head combination to connect the piles together with limiting positions. Combined with the combination of the limiting head and limiting joint, the strength of the connecting structure is further enhanced, forming a triple limiting and triple waterproof structure. Combined with the hollow cavity for automatic drainage, this not only significantly improves the waterproof performance at the connection point but also effectively enhances the stability and wave resistance during pile sinking, as well as the stability and wave resistance of the cofferdam. While ensuring the convenience of construction materials and the construction period, it effectively improves the connection strength and sealing performance of the cofferdam connection, as well as the wave resistance during the cofferdam construction process, thus improving the smoothness and stability of the construction process.

Description

Technical Field

[0001] This invention relates to the field of cofferdam technology, specifically to a deep-water steel pipe pile cofferdam and its construction method. Background Technology

[0002] Steel pipe pile cofferdams (hereinafter referred to as cofferdams) are widely used in the construction of bridge pier and abutment foundations in deep water as a temporary water-retaining and construction support structure. They are mainly composed of steel pipe piles, interlocking connection structures, and internal support systems. Adjacent steel pipe piles form a continuous water-retaining wall through the interlocking of the interlocking connection structures, and the internal support system provides inward constraints, giving the overall cofferdam structure high load-bearing capacity, resistance to water flow impact, and anti-seepage performance.

[0003] However, in cofferdam structures, the connection points between adjacent steel pipe piles are often weak points in the overall structure. Existing engineering projects often use a combination of arc-shaped interlocking joints and arc-shaped locking heads (such as...). Figure 1 As shown in the figure, this type of interlocking connection structure achieves the connection and positioning of steel pipe piles through curved surface fitting. Although it has the advantages of convenient construction and low sinking resistance, its connection strength and sealing performance are limited. In complex waters (such as high geological instability, high water flow velocity, frequent disturbance of water flow by passing ships, etc.), it is easily affected by adverse factors such as geological instability, water flow impact and ship disturbance, which leads to increased stability of the cofferdam structure and leakage risk.

[0004] To address the aforementioned issues, some existing technologies employ a combination of an arc-shaped lock opening and a T-shaped lock head (such as...). Figure 2 As shown, a closed hollow cavity is formed at the connection point, and the arc-shaped locking joint and the T-shaped locking head are fixed together as a whole by grouting to improve the strength and seepage prevention of the connection. However, this not only increases the complexity of the construction process (requiring the placement of grouting equipment and materials on the construction platform above water), but also increases the difficulty of construction organization and prolongs the construction period. Furthermore, the grout cannot be recycled after it solidifies, leading to increased costs. In addition, during the cofferdam demolition stage, the presence of the grout significantly increases the difficulty of pile extraction, which may reduce the recovery rate of steel pipe piles and may even require underwater cutting, further increasing the construction period and economic costs.

[0005] Therefore, how to improve the connection strength and sealing performance of the cofferdam joints while ensuring the convenience of on-site construction and the construction period has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] This invention provides a deep-water steel pipe pile cofferdam and its construction method. The deep-water steel pipe pile cofferdam includes an internal support structure, several piles, and several connecting structures. The piles are arranged sequentially to form a closed cofferdam structure. The internal support structure is installed inside the cofferdam. Adjacent piles are connected by connecting structures. Each connecting structure includes a locking port, a limiting port, a locking head, a limiting head, and a drainage outlet. The locking port and the limiting port are located on one of two adjacent piles, and the limiting ports are symmetrically distributed and located on the inner and outer sides of the locking port, respectively. The locking head and the limiting head are located on the outer and inner sides of the locking port, respectively. On another pile in the pile body, the lock head and lock mouth cooperate to connect the adjacent pile bodies together and form a main waterproof area at the connection. The limiting head and limiting mouth cooperate one-to-one to form a secondary waterproof area. The limiting mouth, through its limiting action on the limiting head, forms limiting points on the inner and outer sides of the lock mouth. The secondary waterproof areas on the inner and outer sides, together with the main waterproof area, form a hollow cavity. The drain outlet is used to automatically discharge the liquid in the hollow cavity. The limiting head is set at an angle and cooperates with the limiting mouth. Combined with the connection between the lock mouth and the lock head, it forms an opposite limiting structure.

[0007] In one possible implementation, the limiting port includes an arc-shaped limiting area and an arc-shaped receiving area with opposite concave and convex directions. The arc-shaped limiting areas are located on both sides of the arc-shaped receiving area. The limiting head includes a straight plate-shaped limiting connecting part and an arc-shaped anti-detachment part. The anti-detachment part is located in the arc-shaped receiving area and the two are in clearance fit. The limiting connecting part is in limiting fit with the arc-shaped limiting area and the two are in linear contact.

[0008] In one possible implementation, the internal support structure includes a support portion and a sealing portion, the sealing portion being used to seal the drainage outlet.

[0009] In one possible implementation, the sealing part includes a plurality of abutting members with sealing areas, the abutting members being inserted between adjacent piles and abutting against two adjacent piles to further strengthen the connection structure.

[0010] In one possible implementation, the arc-shaped limiting area is in linear contact with the anti-detachment portion.

[0011] In one possible implementation, both the lock opening and the lock head are arc-shaped structures, and the two are tightly fitted together.

[0012] In one possible implementation, the drain outlet is located on the lock.

[0013] A method for constructing a deep-water steel pipe pile cofferdam includes the following steps: S1: Constructing a construction platform in the target water area; S2: Piling piles, based on S1, sequentially sinking the piles into the target area to form a cofferdam; S3: Installing an internal support structure, based on S2, installing an internal support structure.

[0014] The above-mentioned one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: According to the deep-water steel pipe pile cofferdam and its construction method provided by the embodiments of the present invention, a simple lock mouth and lock head are used to connect the piles together in a limiting manner. Combined with the cooperation of the limiting head and the limiting mouth, the strength of the connection structure is further strengthened, and a triple limiting and triple waterproof structure is formed. Combined with the hollow cavity for automatic drainage, it not only significantly improves the waterproof performance of the connection, but also effectively improves the stability and wave resistance of the pile body during the sinking process, as well as the stability and wave resistance of the cofferdam. While ensuring the convenience of the cofferdam construction materials and the construction period, it effectively improves the connection strength and sealing performance of the cofferdam connection and the wave resistance of the cofferdam construction process, and improves the smoothness and stability of the construction process. In particular, the inclined setting of the limiting head and the limiting of the limiting mouth combined with the limiting of the lock mouth and lock head form a multi-directional constraint, which improves the strength of the overall structure and the wave resistance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the combined structure of the arc-shaped lock opening and the arc-shaped lock head.

[0016] Figure 2 This is a schematic diagram of the structure of the arc-shaped lock opening and the T-shaped lock head.

[0017] Figure 3 This is a schematic diagram of a deep-water steel pipe pile cofferdam structure provided in an embodiment of the present invention.

[0018] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0019] Figure 5 This is a structural schematic diagram of the arc-shaped limiting area, arc-shaped receiving area, limiting connection part, and anti-detachment part of a deep-water steel pipe pile cofferdam provided in an embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the drainage outlet of a deep-water steel pipe pile cofferdam provided in an embodiment of the present invention.

[0021] In the diagram: 1. Internal support structure; 101. Support part; 102. Sealing part; 112. Sealing area; 122. Anchoring element; 2. Pile body; 3. Connecting structure; 31. Locking port; 32. Limiting port; 321. Arc-shaped limiting area; 322. Arc-shaped receiving area; 33. Lock head; 34. Limiting head; 341. Limiting connection part; 342. Anti-detachment part; 35. Drainage outlet; 351. Connecting groove; 352. Drainage hole. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Please see Figure 3 , Figure 4 and Figure 6 A deep-water steel pipe pile cofferdam includes an internal support structure 1, several piles 2, and several connecting structures 3. The piles 2 are arranged sequentially to form a rectangular closed cofferdam (e.g., Figure 3 As shown), adjacent piles 2 are connected together by a connecting structure 3. The connecting structure 3 includes a locking port 31 and a limiting port 32 on one of the two adjacent piles 2, and a locking head 33 and a limiting head 34 on the other pile 2. The locking head 33 and the locking port 31 cooperate to limit and connect the two adjacent piles 2 together, forming a main waterproof area at the connection. The limiting ports 32 are symmetrically distributed and located on the inner and outer sides of the locking port 31 (e.g., ...). Figure 4 As shown), the limiting head 34 and the limiting port 32 are matched one-to-one to form a secondary waterproof area. The secondary waterproof areas on the inner and outer sides, together with the main waterproof area, form a hollow cavity. The locking port 31 is provided with a drain port 35 for automatically draining the liquid in the hollow cavity. Both the locking port 31 and the locking head 33 are arc-shaped structures and are tightly fitted together.

[0024] During the pile driving process, the locking head 33 and the limiting head 34 on the subsequent pile body 2 move downwards along the corresponding locking opening 31 and limiting opening 32 on the preceding pile body 2. During this process, the locking opening 31 limits the locking head 33, and the limiting opening 32 limits the corresponding limiting head 34. Figure 6 As shown, the locking port 31 limits the locking head 33 to form an intermediate limiting point, and the limiting port 32 limits the corresponding limiting head 34. A limiting point is formed on the inner and outer sides of the intermediate limiting point, forming a triple limiting, which significantly improves the stability and wind and wave resistance during the sinking process. It effectively avoids the pile body 2 from being deflected by wind and waves during the sinking process, thus affecting the stability and smoothness of the sinking process. At the same time, the triple waterproof structure (main waterproof area and inner and outer secondary waterproof areas) combined with the hollow cavity effectively improves the waterproof performance of the connection.

[0025] See Figure 4 and Figure 5 The limiting port 32 includes an arc-shaped limiting area 321 and an arc-shaped receiving area 322 with opposite concave and convex directions. The arc-shaped limiting area 321 is located on both sides of the arc-shaped receiving area 322 (e.g., Figure 5As shown), the limiting head 34 includes a straight limiting connection part 341 and an arc-shaped anti-detachment part 342. The limiting connection part 341 is inclined, and the arc-shaped limiting areas 321 on both sides of the arc-shaped receiving area 322 are symmetrically distributed with the limiting connection part 341 as the center of symmetry. The anti-detachment part 342 is located within the arc-shaped receiving area 322, and the two are fitted with a gap to reduce the resistance during the pile driving process. The limiting connection part 341 is in linear contact with the arc-shaped limiting area 321, such as... Figure 5 As shown, during the pile driving process, the limiting connection part 341 moves downward from the middle of the symmetrical arc-shaped limiting area 321. The symmetrical arc-shaped limiting area 321 limits the limiting connection part 341, and the two are in linear contact, effectively reducing the resistance during pile driving and improving the smoothness of the process. The anti-detachment part 342 is located within the arc-shaped receiving area 322, avoiding the risk of detachment between the limiting connection part 341 and the arc-shaped limiting area 321 due to abnormal processing or installation errors. Furthermore, it further improves the overall structure's resistance to wind and waves during subsequent use. The inclined setting of the limiting connection part 341, under the limitation of the arc-shaped limiting area 321, constitutes an opposite limiting structure, such as... Figure 5 As shown, the inner limiting connection portion 341 is inclined from the inside to the outside in the direction from the lock opening 31 to the lock head 33. The limiting direction of the corresponding arc-shaped limiting area 321 on the limiting connection portion 341 is perpendicular to the limiting connection portion 341. The outer limiting connection portion 341 is inclined from the outside to the inside in the direction from the lock opening 31 to the lock head 33. The limiting direction of the corresponding arc-shaped limiting area 321 on the limiting connection portion 341 is perpendicular to the limiting connection portion 341. Therefore, an opposite limiting structure is formed. Combined with the limiting of the lock opening 31 and the lock head 33, a multi-directional constraint is formed, which further improves the strength of the overall structure and its resistance to wind and waves. The arc-shaped limiting area 321 also limits the anti-loosening part 342 and the two are in linear contact, which further improves the strength of the overall structure.

[0026] See Figure 3 , Figure 5 and Figure 6 The inner support structure 1 includes a support part 101 and a sealing part 102. The support part 101 includes multiple sets of surrounding beams, which are distributed from top to bottom. The sealing part 102 includes several abutting members 122 with sealing areas 112. The abutting members 122 are inserted between adjacent piles 2 and abut against two adjacent piles 2. The abutting members 122 are installed on the bottommost surrounding beam. After the surrounding beam is installed, when the abutting members 122 on it are just inserted between adjacent piles 2, the sealing area 112 is tightly abutted against the corresponding drainage outlet 35 to seal the drainage outlet 35. At the same time, the strength of the cofferdam structure is further increased by the abutting members 122 against the piles 2.

[0027] See Figure 3 and Figure 6The drainage outlet 35 is located at the bottom of the cofferdam and includes a connecting groove 351 distributed along the lock opening 31 and a drainage hole 352 communicating with the connecting groove 351. The connecting groove 351 connects the two hollow cavities (e.g., Figure 6 As shown), the drainage hole 352 introduces the connecting groove 351 into the cofferdam. During the drainage process inside the cofferdam, the liquid in the hollow cavity automatically enters the cofferdam through the connecting groove 351 and the drainage hole 352 for automatic drainage. The drainage outlet 35 is set along the locking opening 31 and the inner limiting opening 32 and is located at the bottom of the cofferdam.

[0028] A method for constructing a deep-water steel pipe pile cofferdam, comprising the following steps: S1: Constructing a construction platform in the target water area; S2: Piling piles, based on S1, sequentially sinking pile bodies 2 into the target area to form a cofferdam; S3: Installing an internal support structure 1, based on S2.

[0029] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A deep-water steel pipe pile cofferdam, comprising an internal support structure and a plurality of piles, the piles being arranged sequentially to form a closed cofferdam structure, the internal support structure being installed inside the cofferdam, characterized in that: A connecting structure is provided between adjacent piles, the connecting structure including: The locking port and the limiting port are located on one of the two adjacent piles, and the limiting ports are symmetrically distributed and located on the inner and outer sides of the locking port respectively. The locking head and the limiting head are located on the other of the two adjacent piles; The lock head and lock opening cooperate to connect adjacent piles together and form the main waterproof zone at the connection point; The limiting head and the limiting port are matched one-to-one to form a secondary waterproof area; The limiting port forms limiting points on both the inner and outer sides of the lock opening by limiting the limiting head; The secondary waterproofing zones on both the inner and outer sides, together with the main waterproofing zone, form a hollow cavity; Drain outlet, used to automatically drain liquid from the hollow cavity; The limiting head is tilted and cooperates with the limiting port, and together with the connection between the lock port and the lock head, it forms an opposite limiting structure; The limiting port includes an arc-shaped limiting area and an arc-shaped receiving area with opposite concave and convex directions. The arc-shaped limiting areas are located on both sides of the arc-shaped receiving area. The limiting head includes a straight plate-shaped limiting connecting part and an arc-shaped anti-detachment part. The limiting connecting part is inclined, and the anti-detachment part is located in the arc-shaped receiving area and the two are in clearance fit. The limiting connecting part and the arc-shaped limiting area are in limiting fit and linear contact. The arc-shaped limiting area is in linear contact with the anti-detachment part.

2. The deep-water steel pipe pile cofferdam according to claim 1, characterized in that: The internal support structure includes a support part and a sealing part, the sealing part being used to seal the drainage outlet.

3. A deep-water steel pipe pile cofferdam according to claim 2, characterized in that: The sealing part includes several clamping members with sealing areas. The clamping members are inserted between adjacent piles and abut against and connected to the two adjacent piles.

4. A deep-water steel pipe pile cofferdam according to claim 1, characterized in that: Both the lock opening and the lock head are arc-shaped structures, and the two are tightly fitted together.

5. A deep-water steel pipe pile cofferdam according to claim 1, characterized in that: The drain outlet is located on the lock.

6. A method for constructing a deep-water steel pipe pile cofferdam, comprising the deep-water steel pipe pile cofferdam as described in claim 1, characterized in that: Includes the following steps: S1: Construct a construction platform in the target water area; S2: Drive piles into the target area to form a cofferdam, based on S1; S3: Install the internal support structure, based on S2.

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