A ring anchor recovery tool and a ring anchor recovery method

Abstract

The present invention provides a ring anchor recovery tool and a ring anchor recovery method, which belong to the technical field of marine engineering infrastructure, wherein the ring anchor recovery tool includes a recovery cylinder, a pump assembly, a hoisting part and a mounting part, one end of the recovery cylinder is provided with a cover body, and the other end is an open end for cooperating with the top of the ring anchor, the pump assembly is arranged on the cover body, and the pump assembly is used to pressurize the inside of the recovery cylinder; the hoisting part is arranged on the cover body, and the hoisting part is used to connect with the hoisting equipment; the mounting part is arranged on the cover body, and the mounting part is used to connect with the anchor chain on the ring anchor, so that the ring anchor is coaxially fixed to the open end of the recovery cylinder. By injecting water into the recovery cylinder to increase the pressure, the ring anchor to be recovered is driven to rise and recovered, the recovery process is fast, the noise is small, the impact on the environment is small, there is no need to penetrate the cover body to the height of the seabed, and the soil plug in the cylinder is effectively prevented from being sucked into the pump assembly during the negative pressure penetration of the recovery cylinder, causing equipment damage.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering foundation structures, and in particular to a ring anchor recovery tool and a ring anchor recovery method. Background Art

[0002] As the offshore wind power industry and offshore oil exploitation gradually move towards deepwater areas, various forms of floating anchor foundations have been promoted and developed, mainly including drag-type flat anchors, suction anchors and dynamic anchors, etc. Among them, suction anchors are widely used due to their convenient construction, high cost performance, and recyclability.

[0003] Since the suction anchor is generally a cylindrical structure with a closed upper end and an open lower end, its own structural characteristics mean that during the descent process, the suction anchor can only reach the seabed surface. The closed upper end structure makes it difficult to move further downward. Considering the anti-scouring problem and the large torque load caused by the non-coplanar load, a new anchor structure is designed, namely a ring anchor with upper and lower openings. The ring anchor is installed to a certain depth below the seabed to utilize the high bearing capacity of the deeper soil. However, the ring anchor installed below the seabed is difficult to recover after the service ends. If a large pulling force is provided by lifting equipment for lifting, the required pulling force is very large, the speed is slow, and the efficiency is low. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that when lifting the annular anchor installed below the seabed through the pulling force provided by the lifting equipment, the pulling force required is very large, the speed is slow, and the efficiency is low, thereby providing an annular anchor recovery tool and annular anchor recovery method.

[0005] In order to solve the above technical problems, the present invention provides a ring anchor recovery tool, which is used to recover the ring anchor with upper and lower openings, comprising:

[0006] A recovery cylinder, one end of which is provided with a cover body and the other end of which is an open end for cooperating with the top of the annular anchor;

[0007] A pump assembly is disposed on the cover body, and is used to pressurize the interior of the recovery cylinder;

[0008] A hoisting part, arranged on the cover body, and used to be connected with a hoisting device;

[0009] The mounting part has multiple groups and is arranged on the cover body. The mounting part is used to be connected with the anchor chain on the ring anchor so that the ring anchor is coaxially fixed to the open end of the recovery cylinder.

[0010] Optionally, it also includes:

[0011] A limiting device is arranged at the open end of the recovery cylinder and is used to limit the relative movement between the annular anchor and the recovery cylinder in the radial direction.

[0012] Optionally, the limiting device includes:

[0013] A limiting plate has one end connected to the inner wall of the open end of the recovery cylinder, and the other end is suitable for extending into the interior of the annular anchor to abut against the inner wall of the annular anchor.

[0014] Optionally, there are multiple groups of the limiting plates, and the multiple groups of the limiting plates are arranged at intervals along the circumferential direction of the recovery cylinder.

[0015] Optionally, the bottom end of the limiting plate has a guide portion bent toward the center.

[0016] Optionally, the end surface of the open end of the recovery cylinder and the end surface of the annular anchor are butted against each other.

[0017] Optionally, the hanging parts have multiple groups, and the multiple groups of hanging parts are symmetrically arranged along the circumferential direction of the cover body.

[0018] Optionally, the mounting portion has multiple groups of mounting points, and the multiple groups of mounting points are arranged in sequence along the binding direction of the anchor chain.

[0019] Optionally, the side wall of the recovery cylinder is provided with a cylinder connecting part, the cylinder connecting part has multiple groups, and the mounting part and the cylinder connecting part are arranged correspondingly.

[0020] The present invention provides a method for recovering an annular anchor, using any of the annular anchor recovery tools described above, comprising the following steps:

[0021] Connect the lifting device to the lifting part on the cover, then lift the recovery cylinder and sink it into the water;

[0022] During the sinking process, the pump assembly is started to discharge the water in the recovery cylinder, forming a pressure difference between the inside and outside of the recovery cylinder, and the recovery cylinder is sunk to above the annular anchor to be recovered by using the pressure difference, and then the open end of the recovery cylinder is docked with the top of the annular anchor;

[0023] The anchor chain on the annular anchor is connected to the mounting portion on the cover body by an underwater robot so that the annular anchor is coaxially fixed to the open end of the recovery cylinder;

[0024] Start the pump assembly, inject water into the recovery cylinder to increase the pressure, and cooperate with the lifting equipment to pull the recovery cylinder and the annular anchor out of the seabed.

[0025] The technical solution of the present invention has the following advantages:

[0026] 1. The annular anchor recovery tool provided by the present invention is used for cooperating with the recovery of annular anchors with upper and lower openings. A cover body is provided at one end of the recovery cylinder, and a pump body assembly, a hoisting part and a mounting part are provided on the cover body. The annular anchor is docked at the open end of the recovery cylinder, connected with the anchor chain through the mounting part, and the annular anchor is coaxially fixed at the open end of the recovery cylinder. The pump body assembly is controlled to inject water to increase the pressure in the recovery cylinder, so as to drive the annular anchor to be recovered to rise and realize recovery. The recovery process is fast, the noise is small, and the impact on the environment is small. There is no need to penetrate the cover body to the height of the seabed, and the length of the recovery cylinder can be appropriately increased. The soil plug in the cylinder can be effectively prevented from being sucked into the pump body assembly during the negative pressure penetration of the recovery cylinder, causing damage to the equipment.

[0027] 2. The annular anchor recovery tool provided by the present invention also includes a limiting device, which is arranged at the open end of the recovery cylinder and is used to restrict the movement of the annular anchor to be recovered in the radial direction during the ascending process to avoid excessive ascending resistance caused by dislocation.

[0028] 3. The ring anchor recovery tool provided by the present invention has a limiting device including limiting plates, which abut against the inner wall of the ring anchor through multiple groups of limiting plates spaced apart along the circumferential direction of the recovery cylinder to prevent the ring anchor from shaking during movement. The structure is simple and the stability is high.

[0029] 4. The annular anchor recovery tool provided by the present invention has a guide portion bent toward the center at the bottom end of the limiting plate. The setting of the guide portion locks the position of the annular anchor in advance, thereby avoiding the problem of the annular anchor being tilted and difficult to dock.

[0030] 5. In the annular anchor recovery tool provided by the present invention, the end surface of the open end of the recovery cylinder and the end surface of the annular anchor are arranged correspondingly to avoid the annular anchor moving in its axial direction during the recovery process to affect the recovery efficiency.

[0031] 6. The annular anchor recovery tool provided by the present invention has multiple groups of lifting parts, and the multiple groups of lifting parts are symmetrically arranged along the circumferential direction of the cover body. The arrangement of the multiple groups of lifting parts improves the stability of the lifting process and further improves the accuracy of docking with the annular anchor to be recovered.

[0032] 7. The annular anchor recovery tool provided by the present invention has a mounting portion with multiple groups of mounting points, and the multiple groups of mounting points are arranged in sequence along the binding direction of the anchor chain. The arrangement of the multiple groups of mounting points enhances the stability of the binding.

[0033] 8. The annular anchor recovery tool provided by the present invention is provided with a cylinder connecting portion on the side wall of the recovery cylinder to further fix the anchor chain, thereby preventing the anchor chain from shaking on the side wall of the recovery cylinder and ensuring the stability of the recovery process.

[0034] 9. The annular anchor recovery method provided by the present invention adopts an annular anchor recovery tool, and the recovery cylinder is lowered to the top of the annular anchor by a lifting device, and the annular anchor is fixed to the open end of the recovery cylinder by an anchor chain, and the pump body assembly is started to inject water and increase the pressure, and the recovery cylinder and the annular anchor are lifted together with the lifting equipment to pull them out of the seabed. The recovery speed is fast, the noise is small, and the recovery tool can be reused, which reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic structural diagram of a specific implementation of a ring anchor recovery tool provided in an embodiment of the present invention;

[0037] Figure 2 for Figure 1 Another perspective structural diagram of the annular anchor recovery tool;

[0038] Figure 3 is a schematic diagram of the structure of the annular anchor to be recovered;

[0039] Figure 4 for Figure 1 Schematic diagram of the structure of the middle annular anchor recovery tool after it is sunk into the water and before it docks with the annular anchor;

[0040] Figure 5 for Figure 4 A schematic diagram of the structure of the middle annular anchor recovery tool after it is sunk into the water and fixed to the annular anchor;

[0041] Figure 6 Schematic diagram of the structure of the lifting equipment pulling the recovery cylinder and the ring anchor out of the seabed.

[0042] Description of reference numerals:

[0043] 1. Ring anchor; 2. Recovery cylinder; 3. Cover; 4. Pump assembly; 5. Hoisting part; 6. Installation part; 7. Anchor chain; 8. Limiting device; 9. Limiting plate; 10. Guide part; 11. Cylinder connection part. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] The annular anchor recovery tool provided in this embodiment is used to recover annular anchors with upper and lower openings.

[0049] like Figures 1 to 3 As shown, a specific implementation of the annular anchor recovery tool provided in this embodiment includes a recovery cylinder 2, a pump body assembly 4, a hoisting part 5 and a mounting part 6, one end of the recovery cylinder 2 is provided with a cover body 3, and the other end of the recovery cylinder 2 is an open end for cooperating with the top of the annular anchor 1, and the height dimension of the recovery cylinder 2 is greater than the distance dimension between the top of the annular anchor 1 and the seabed; the pump body assembly 4 is arranged on the cover body 3, and the pump body assembly 4 is used to pressurize the interior of the recovery cylinder 2; the hoisting part 5 is arranged on the cover body 3, and the hoisting part 5 is used to connect with the hoisting equipment; the mounting part 6 has a plurality of groups, which are arranged on the cover body 3, and the mounting part 6 is used to connect with the anchor chain 7 on the annular anchor 1, so that the annular anchor 1 is coaxially fixed to the open end of the recovery cylinder 2.

[0050] The annular anchor 1 is docked at the open end of the recovery cylinder 2, connected to the anchor chain 7 through the mounting portion 6, and coaxially fixed to the open end of the recovery cylinder 2. The pump body assembly 4 is controlled to inject water to increase the pressure in the recovery cylinder 2, thereby driving the annular anchor 1 to be recovered to rise and realize recovery. The recovery process is fast, with low noise and little impact on the environment. The cover body 3 does not need to be penetrated to the height of the seabed, and the length of the recovery cylinder 2 can be appropriately increased. The soil plug in the cylinder can be effectively prevented from being sucked into the pump body assembly 4 during the negative pressure penetration of the recovery cylinder 2, causing damage to the equipment.

[0051] Specifically, the shape of the open end of the recovery cylinder 2 is adapted to the top shape of the annular anchor 1 to be recovered, and after the recovery cylinder 2 and the annular anchor 1 are fixed, the annular anchor 1 can be regarded as a part of the recovery cylinder 2 and recovered together with the recovery cylinder 2. The hoisting portion 5 and the mounting portion 6 can both be configured as a lifting ear structure, which is used to connect with the hoisting equipment and the anchor chain respectively.

[0052] like Figure 1 and Figure 2 As shown, the annular anchor recovery tool provided in this embodiment also includes a limiting device 8, which is arranged at the open end of the recovery cylinder 2, and is used to limit the relative movement between the annular anchor 1 and the recovery cylinder 2 in the radial direction, so as to avoid the annular anchor and the annular anchor recovery tool being misaligned with each other during the process of the annular anchor being driven by the annular anchor recovery tool to rise, thereby causing excessive rising resistance.

[0053] like Figure 1 and Figure 2 As shown, the ring anchor recovery tool provided in this embodiment, the limiting device 8 includes a limiting plate 9, one end of the limiting plate 9 is connected to the inner wall of the open end of the recovery cylinder 2, and the other end of the limiting plate 9 is suitable for extending into the interior of the ring anchor 1, and is used to abut against the inner wall of the ring anchor 1. The ring anchor 1 is prevented from shaking during movement, and the structure is simple and the stability is high. Specifically, the limiting plate 9 can be a rectangular structure, or it can be an arc-shaped plate structure that matches the inner wall of the ring anchor 1. In addition, as an alternative embodiment, one end of the limiting plate 9 can also be set on the outer wall of the open end of the recovery cylinder 2, and the other end of the limiting plate 9 abuts against the outer wall of the ring anchor 1, so as to constrain the movement of the ring anchor 1 from the outside of the ring anchor 1.

[0054] The limiting plates 9 provided in this embodiment have multiple groups, and the multiple groups of limiting plates 9 are arranged at intervals along the circumferential direction of the recovery cylinder 2 to ensure the constraints on the annular anchor 1 in all directions. In addition, as an alternative implementation, the limiting plates 9 can also be a group of cylindrical structures.

[0055] like Figure 1 and Figure 2As shown, in the annular anchor recovery tool provided in this embodiment, the bottom end of the limiting plate 9 has a guide portion 10 bent toward the center direction. The setting of the guide portion 10 locks the position of the annular anchor 1 in advance, avoiding the problem of the annular anchor 1 being tilted and difficult to dock.

[0056] The end face of the open end of the recovery cylinder 2 provided in this embodiment is butted against the end face of the annular anchor 1, and the end face of the open end of the recovery cylinder 2 abuts against the end face of the annular anchor 1 to prevent the annular anchor 1 from moving in its axial direction during the recovery process and affecting the recovery efficiency.

[0057] like Figure 1 As shown, in the annular anchor recovery tool provided in this embodiment, the hoisting parts 5 have multiple groups, and the multiple groups of hoisting parts 5 are symmetrically arranged along the circumferential direction of the cover body 3. The arrangement of multiple groups of hoisting parts 5 improves the stability of the hoisting process and improves the accuracy of docking with the annular anchor 1 to be recovered. Specifically, the hoisting parts 5 can be arranged at the edge of the top surface of the cover body 3, and the multiple groups of hoisting parts 5 are symmetrically arranged, which further improves the stability of the hoisting process.

[0058] like Figure 1 As shown, in the annular anchor recovery tool provided in this embodiment, the mounting portion 6 has multiple groups of mounting points, and the multiple groups of mounting points are sequentially arranged along the binding direction of the anchor chain 7. The arrangement of multiple groups of mounting points enhances the stability of the binding of the anchor chain 7. Specifically, a group of mounting points is arranged in the middle of the top surface of the cover body 3, and another group of mounting points is arranged at the edge of the top surface of the cover body 3. The anchor chain 7 is bound by multiple groups of mounting points, and the binding effect is better.

[0059] like Figure 1 As shown, in the annular anchor recovery tool provided in this embodiment, the side wall of the recovery cylinder 2 is provided with a cylinder connection part 11, and the cylinder connection part 11 has multiple groups, and the mounting part 6 is provided correspondingly to the cylinder connection part 11. The anchor chain 7 is further fixed to prevent the anchor chain 7 from shaking on the side wall of the recovery cylinder 2, thereby ensuring the stability of the recovery process.

[0060] like Figures 4 to 6 As shown, this embodiment also provides a ring anchor recovery method, using the ring anchor recovery tool described in the above embodiment, including the following steps:

[0061] Connect the lifting device to the lifting part 5 on the cover 3, then lift the recovery cylinder 2 and sink it into the water. Figure 4 As shown;

[0062] During the sinking process, the pump assembly 4 is started to discharge the water in the recovery cylinder 2, and a pressure difference is formed inside and outside the recovery cylinder 2. The recovery cylinder 2 is sunk to the top of the ring anchor to be recovered by using the pressure difference, and then the open end of the recovery cylinder 2 is docked with the top of the ring anchor, wherein the recovery cylinder 2 penetrates to the top of the ring anchor 1 at a speed of no more than 5 m / h;

[0063] The anchor chain 7 on the annular anchor is connected to the mounting portion 6 on the cover 3 by an underwater robot, so that the annular anchor is coaxially fixed to the open end of the recovery cylinder 2. Figure 5 As shown;

[0064] Start the pump assembly 4 to inject water into the recovery cylinder 2 to increase the pressure, and at the same time cooperate with the lifting equipment to pull the recovery cylinder 2 and the annular anchor out of the seabed. Figure 6 shown.

[0065] By using the annular anchor recovery tool, the recovery cylinder 2 is lowered to the top of the annular anchor 1 through the lifting equipment, the annular anchor 1 is fixed to the open end of the recovery cylinder 2 through the anchor chain 7, the pump body assembly 4 is started to inject water and increase the pressure, and the recovery cylinder 2 and the annular anchor 1 are lifted together with the lifting equipment to pull them out of the seabed. The recovery speed is fast, the noise is small, the recovery tool can be reused, and the cost is reduced.

[0066] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present invention.

Claims

1. A method for recovering a ring anchor, characterized in that: The invention is applied to an annular anchor recovery tool, the annular anchor recovery tool is used to cooperate with the recovery of an annular anchor (1) with upper and lower openings, the annular anchor recovery tool comprises a recovery cylinder (2), a pump assembly (4), a hoisting part (5), an installation part (6) and a limiting device (8), one end of the recovery cylinder (2) is provided with a cover body (3), and the other end is an open end for cooperating with the top of the annular anchor (1); the pump assembly (4) is arranged on the cover body (3), and the pump assembly (4) is used to pressurize the interior of the recovery cylinder (2); the hoisting part (5) is arranged on the cover body (3), and the hoisting part (5) is used to be connected to the hoisting equipment; the installation part (6) is provided with a cover body (3) at one end of the recovery cylinder (2 ... hoisting part (5) is used to be connected to the hoisting equipment; the installation part (6) is provided with a cover body (3) at the other end of the recovery cylinder (2); the pump assembly (4) is provided with a cover body (3), and the pump assembly (4) is used to pressurize the interior of the recovery cylinder (2); the hoisting part (5) is provided with a cover body (3), and the hoisting part (5) is used to be connected to the hoisting equipment; the installation part (6) is provided with a cover body (3) at one end of the recovery cylinder (2), and the pump assembly (4) is used to pressurize the The mounting part (6) has a plurality of groups and is arranged on the cover body (3); the mounting part (6) is used to connect with the anchor chain (7) on the annular anchor (1) so that the annular anchor (1) is coaxially fixed to the open end of the recovery cylinder (2); a limiting device (8) is arranged at the open end of the recovery cylinder (2) and is used to limit the relative movement between the annular anchor (1) and the recovery cylinder (2) in the radial direction; the limiting device (8) comprises a limiting plate (9), one end of which is connected to the inner wall of the open end of the recovery cylinder (2), and the other end is suitable for extending into the interior of the annular anchor (1) and is used to abut against the inner wall of the annular anchor (1); The annular anchor recovery method comprises the following steps: Connecting the lifting device to the lifting part (5) on the cover body (3), and then lifting the recovery cylinder (2) and sinking it into water; During the sinking process, the pump assembly (4) is started to discharge the water in the recovery cylinder (2), thereby forming a pressure difference between the inside and outside of the recovery cylinder (2), and using the pressure difference to sink the recovery cylinder (2) to above the annular anchor to be recovered, and then the open end of the recovery cylinder (2) is docked with the top of the annular anchor; The anchor chain (7) on the annular anchor is connected to the mounting portion (6) on the cover body (3) by an underwater robot, so that the annular anchor is coaxially fixed to the open end of the recovery cylinder (2); The pump assembly (4) is started to inject water into the recovery cylinder (2) to increase the pressure, and the recovery cylinder (2) and the annular anchor are pulled out of the seabed together with the lifting equipment.

2. The method for recovering an annular anchor according to claim 1, characterized in that: The limiting plates (9) include a plurality of groups, and the plurality of groups of limiting plates (9) are arranged at intervals along the circumferential direction of the recovery cylinder (2).

3. The method for recovering an annular anchor according to claim 1, characterized in that: The bottom end of the limiting plate (9) has a guide portion (10) bent towards the center.

4. The method for recovering an annular anchor according to claim 1, characterized in that: The end surface of the open end of the recovery cylinder (2) and the end surface of the annular anchor (1) are butted against each other.

5. The annular anchor recovery method according to claim 1, characterized in that: The hanging parts (5) have a plurality of groups, and the plurality of groups of hanging parts (5) are symmetrically arranged along the circumferential direction of the cover body (3).

6. The annular anchor recovery method according to claim 1, characterized in that: The mounting portion (6) has a plurality of groups of mounting points, and the plurality of groups of mounting points are arranged in sequence along the binding direction of the anchor chain (7).

7. The method for recovering an annular anchor according to claim 1, characterized in that: The side wall of the recovery cylinder (2) is provided with a cylinder connecting portion (11), the cylinder connecting portion (11) has a plurality of groups, and the mounting portion (6) and the cylinder connecting portion (11) are arranged correspondingly.

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