High holding power anchor group system and mounting method

Abstract

The invention discloses a high holding power anchor group system and a mounting method.The high holding power anchor group system comprises a front high holding power anchor and a rear high holding power anchor, the front high holding power anchor comprises a front high holding power anchor plate, a front high holding power anchor shin is fixed to the top face of the front high holding power anchor plate, and a rear high holding power anchor shin is fixed to the top face of the rear high holding power anchor plate; a front mooring point is formed at the front end of the front high holding power anchor shank, the front mooring point is connected with one end of the mooring anchor chain, the rear high holding power anchor comprises a rear high holding power anchor plate, a rear high holding power anchor shank is fixed to the top face of the rear high holding power anchor plate, a rear mooring point is formed at the front end of the rear high holding power anchor shank, and the rear mooring point is connected with one end of the mooring anchor chain. And the connecting piece at the rear end of the anchor plate of the front high holding power anchor is connected with the rear mooring point through a connecting anchor chain. The high holding power anchor group system can be embedded into soft seabed soil by a deeper depth, so that the bearing capacity is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of deep-sea anchoring, and in particular relates to a large-holding force anchor group system and an installation method. Background Art

[0002] With the utilization of deep-sea resources and the development of deep-sea space, the mooring system of large-scale marine floating platforms such as offshore floating wind power platforms, offshore oil and gas production platforms, offshore airports and artificial floating islands has become a key technology. As the operating water depth continues to increase, catenary mooring systems have been widely used. At the same time, higher requirements are placed on the bearing performance and deep-water installation performance of the anchoring structure in the catenary mooring system.

[0003] The typical deep-water anchoring structures currently available include suction anchors, drag embedded plate anchors, suction embedded plate anchors and gravity penetration anchors; as a drag embedded plate anchor, the high-grip anchor has load-bearing characteristics suitable for widely used semi-submersible offshore platforms, providing a bottom-level positioning foundation for offshore wind power, oil and gas, hydrogen production and other fields. When the load-bearing performance requirements reach above 10,000 kN, the load-bearing efficiency of the high-grip anchor exceeds that of the suction anchor, which can reduce the cost of the anchoring structure and is currently one of the most promising deep-sea mooring anchoring forms.

[0004] The large holding power anchor is installed by dragging the mooring anchor chain, and gradually embedded in the seabed under the action of the anti-catenary of the mooring anchor chain, reaching the designed buried depth, exerting its bearing capacity, and providing positioning function for the upper marine floating platform. However, in actual production activities, with the increasing scale of marine floating platforms, the demand for bearing capacity has increased rapidly, and the above-mentioned large holding power anchor has the problems of insufficient bearing capacity and shallow embedding depth in soft seabed soil, which affects the positioning stability and reliability of marine floating platforms in soft soil sea areas. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the present invention provides a large holding force anchor group system and an installation method, wherein the large holding force anchor group system can be embedded at a deeper depth in soft seabed soil to improve the bearing capacity.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A large-grip anchor group system comprises a front large-grip anchor and a rear large-grip anchor, the front large-grip anchor comprises a front large-grip anchor plate, a front large-grip anchor shank is fixed on the top surface of the front large-grip anchor plate, the front end of the front large-grip anchor shank forms a front mooring point, and the front mooring point is connected to one end of a mooring anchor chain, the rear large-grip anchor comprises a rear large-grip anchor plate, a rear large-grip anchor shank is fixed on the top surface of the rear large-grip anchor plate, the front end of the rear large-grip anchor shank forms a rear mooring point, and the connecting piece at the rear end of the front large-grip anchor plate is connected to the rear mooring point through a connecting anchor chain.

[0008] Furthermore, the mass of the rear large holding power anchor is m1, the mass of the front large holding power anchor is m2, and 1<m1 / m2≤2; the length of the connecting anchor chain is more than 5 times the length of the anchor plate of the rear large holding power anchor.

[0009] Furthermore, a front first tooth plate is provided at the left portion of the front end of the front high-gripping anchor plate and a front second tooth plate is provided at the right portion of the front end, so that the front high-gripping anchor forms a front double-tooth high-gripping anchor; the front high-gripping anchor shank is arranged obliquely along the upper front, and the rear end of the front high-gripping anchor shank is fixed to the top surface of the front high-gripping anchor plate between the first front tooth plate and the second front tooth plate, and the front mooring point is at the upper position between the first front tooth plate and the second front tooth plate.

[0010] Furthermore, the front first tooth plate and the front second tooth plate are arranged symmetrically on the left and right, and the front first tooth plate and the front second tooth plate are both integrally arranged with the front large gripping force anchor plate.

[0011] Furthermore, the line between the front mooring point and the middle of the rear end of the front high-grip anchor shank is called the front high-grip anchor shank centerline, and the angle between the front high-grip anchor shank centerline and the front high-grip anchor plate is controlled between 50°-60°.

[0012] Furthermore, the front end of the rear large gripping force anchor plate is provided with a rear first outer tooth plate, a rear first inner tooth plate, a rear second inner tooth plate and a rear second outer tooth plate in sequence from left to right, so that the rear large gripping force anchor forms a rear four-tooth large gripping force anchor; the rear large gripping force anchor shank includes two left and right rear first large gripping force anchor shank plates and a rear second large gripping force anchor shank plate, and the rear first large gripping force anchor shank plate and the rear second large gripping force anchor shank plate are both arranged obliquely along the upper front, and the The rear end of the first rear high-grip anchor shin is fixed to the top surface of the rear high-grip anchor plate on the rear side of the first rear inner tooth plate, the rear end of the second rear high-grip anchor shin is fixed to the top surface of the rear high-grip anchor plate on the rear side of the second rear inner tooth plate, the front end of the first rear high-grip anchor shin and the front end of the second rear high-grip anchor shin meet at one point and form a rear mooring point, and the rear mooring point is located at the upper position between the first rear inner tooth plate and the second rear inner tooth plate.

[0013] Furthermore, the rear first outer tooth plate and the rear second outer tooth plate are arranged symmetrically on the left and right, the rear first inner tooth plate and the rear second inner tooth plate are arranged symmetrically on the left and right, and the rear first outer tooth plate, the rear first inner tooth plate, the rear second inner tooth plate and the rear second outer tooth plate are all integrated with the rear large-grip anchor plate; the rear first large-grip anchor shin plate and the rear second large-grip anchor shin plate are arranged symmetrically on the left and right, and a plurality of rear large-grip anchor shin support plates are provided between the rear first large-grip anchor shin plate and the rear second large-grip anchor shin plate; the connecting piece is located in the upper and middle part of the rear end of the front large-grip anchor plate.

[0014] Furthermore, the line between the rear mooring point and the middle of the bottom end of the rear first high-gripping anchor shin is called the center line of the rear first high-gripping anchor shin, the line between the rear mooring point and the middle of the bottom end of the rear second high-gripping anchor shin is called the center line of the rear second high-gripping anchor shin, and the angles between the center line of the rear first high-gripping anchor shin, the center line of the rear second high-gripping anchor shin and the rear high-gripping anchor plate are all 50°; the length of the rear first inner tooth plate is greater than the length of the rear first outer tooth plate.

[0015] A method for installing a high-holding force anchor group system is used to install the high-holding force anchor group system described above, comprising the following steps:

[0016] S1. transporting the large holding force anchor group system to the designated installation sea area by means of an installation vessel;

[0017] S2, connecting one end of the mooring anchor chain to the front mooring point, connecting the front end of the connecting anchor chain to the connecting piece, and connecting the rear end of the connecting anchor chain to the rear mooring point;

[0018] S3, sinking the large holding force anchor system to the seabed surface;

[0019] S4. Apply a dragging force to the mooring anchor chain through the installation vessel, and keep the mooring anchor chain dragged in the horizontal direction on the seabed surface, the front large-holding anchor is gradually embedded in the seabed under the dragging action of the mooring anchor chain and disturbs the seabed soil on the embedding trajectory path, the connecting anchor chain cuts the disturbed seabed soil, and the rear large-holding anchor is embedded in a deeper seabed and exerts a greater bearing capacity, until the embedding depth of the front large-holding anchor reaches the first design depth and the embedding depth of the rear large-holding anchor reaches the second design depth, stop applying the dragging force to the mooring anchor chain, and complete the installation of the large-holding anchor group system.

[0020] Further, in step S4: the length of the rear high-holding power anchor plate is represented by x, and the dragging speed of the mooring anchor chain is greater than or equal to (1 / 10) x meters per second and less than or equal to (1 / 2) x meters per second.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The large-grip anchor group system of the present invention comprises a front large-grip anchor and a rear large-grip anchor, the front large-grip anchor comprises a front large-grip anchor plate, a front large-grip anchor shank is fixed on the top surface of the front large-grip anchor plate, the front end of the front large-grip anchor shank forms a front mooring point, and the front mooring point is connected to one end of the mooring anchor chain, the rear large-grip anchor comprises a rear large-grip anchor plate, a rear large-grip anchor shank is fixed on the top surface of the rear large-grip anchor plate, the front end of the rear large-grip anchor shank forms a rear mooring point, and the connecting piece at the rear end of the front large-grip anchor plate is connected to the rear mooring point by a connecting anchor chain; in this way, when installing the large-grip anchor group system, the large-grip anchor group system is first transported to the designated installation sea area by an installation ship, and then one end of the mooring anchor chain is connected to the front mooring point The front end of the connecting anchor chain is connected to the connecting piece, and the rear end of the connecting anchor chain is connected to the rear mooring point. Then the large-holding anchor group system is sunk to the seabed surface. Finally, a dragging force is applied to the mooring anchor chain by the installation vessel, and the mooring anchor chain is kept dragged horizontally on the seabed surface. Under the dragging action of the mooring anchor chain, the front large-holding anchor is gradually embedded in the seabed and disturbs the seabed soil on the embedded trajectory path, so that the connecting anchor chain is easier to cut the disturbed seabed soil, thereby making it easier for the rear large-holding anchor to be embedded in a deeper seabed and exert a greater bearing capacity, until the embedding depth of the front large-holding anchor reaches the first design depth and the embedding depth of the rear large-holding anchor reaches the second design depth, then the dragging force on the mooring anchor chain is stopped, and the installation of the large-holding anchor group system is completed. Therefore, the large-holding power anchor group system is equipped with a front large-holding power anchor and a rear large-holding power anchor, and the front large-holding power anchor and the rear large-holding power anchor are connected in series through a single connecting anchor chain, so that the entire large-holding power anchor group system is triggered to embed under the dragging action of the anti-catenary of the mooring anchor chain, thereby achieving a deeper embedding effect than a single large-holding power anchor, and exerting greater load-bearing performance, and improving the overall load-bearing efficiency of the large-holding power anchor group system. In addition, since the rear large-holding power anchor of the large-holding power anchor group system does not need to be equipped with a separate mooring anchor chain, the large-holding power anchor group system only needs to be equipped with a single mooring anchor chain, thereby saving the length of the mooring anchor chain and greatly reducing the overall cost of the large-holding power anchor group system. In addition, the large-holding power anchor group system can expand the applicable sea area and improve its reliability under soft seabed conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the large holding force anchor group system in the present invention;

[0024] Figure 2 It is a top view structural diagram of the rear large holding force anchor;

[0025] Figure 3 This is a schematic diagram of the main structure of the rear large holding force anchor;

[0026] Figure 4 It is a right view structural diagram of the rear large holding force anchor;

[0027] Figure 5 It is a top view structural diagram of the front large holding force anchor;

[0028] Figure 6 This is a schematic diagram of the main structure of the front large holding force anchor;

[0029] Figure 7 It is a right view structural diagram of the front large holding force anchor;

[0030] Figure 8 It is a schematic diagram comparing the embedding trajectory of the high-holding power anchor group system during installation with the embedding trajectory of a single rear high-holding power anchor during installation in the present invention.

[0031] Explanation of the reference numerals in the figure: 1. front high-grip anchor, 101. front high-grip anchor plate, 102. front high-grip anchor shank, 10201. front mooring point, 103. front first tooth plate, 104. front second tooth plate, 105. connecting piece, 2. rear high-grip anchor, 201. rear high-grip anchor plate, 20201. rear first high-grip anchor shank, 20202. rear second high-grip anchor shank, 20203. rear mooring point, 203. rear first outer tooth plate, 204. rear first inner tooth plate, 205. rear second inner tooth plate, 206. rear second outer tooth plate, 207. rear high-grip anchor shank support plate, 3. mooring anchor chain, 4. connecting anchor chain. DETAILED DESCRIPTION

[0032] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] 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.

[0035] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0036] like Figure 1 As shown, a large-holding power anchor group system includes a front large-holding power anchor 1 and a rear large-holding power anchor 2, the front large-holding power anchor 1 includes a front large-holding power anchor plate 101, a front large-holding power anchor shank 102 is fixed on the top surface of the front large-holding power anchor plate 101, the front end of the front large-holding power anchor shank 102 forms a front mooring point 10201, and the front mooring point 10201 is connected to one end of a mooring anchor chain 3, the rear large-holding power anchor 2 includes a rear large-holding power anchor plate 201, a rear large-holding power anchor shank is fixed on the top surface of the rear large-holding power anchor plate 201, the front end of the rear large-holding power anchor shank forms a rear mooring point 20203, and the connecting piece 105 at the rear end of the front large-holding power anchor plate 101 is connected to the rear mooring point 20203 through a connecting anchor chain 4.

[0037] In this way, when installing the large holding power anchor group system, the large holding power anchor group system is first transported to the designated installation sea area by the installation vessel, and then one end of the mooring anchor chain 3 is connected to the front mooring point 10201, and the front end of the connecting anchor chain 4 is connected to the connecting piece 105, and the rear end of the connecting anchor chain 4 is connected to the rear mooring point 20203, and then the large holding power anchor group system is sunk to the seabed surface, and finally the installation vessel applies a dragging force to the mooring anchor chain 3, and keeps the mooring anchor chain 3 dragged horizontally on the seabed surface. The front high-holding anchor 1 is gradually embedded in the seabed under the dragging action of the mooring anchor chain 3 and disturbs the seabed soil on the embedding trajectory, making it easier for the connecting anchor chain 4 to cut the disturbed seabed soil, thereby making it easier for the rear high-holding anchor 2 to embed deeper into the seabed and exert a greater bearing capacity, until the embedding depth of the front high-holding anchor 1 reaches the first design depth and the embedding depth of the rear high-holding anchor 2 reaches the second design depth, then the dragging force on the mooring anchor chain 3 is stopped, and the installation of the high-holding anchor group system is completed. Therefore, the large-holding power anchor group system is configured with a front large-holding power anchor 1 and a rear large-holding power anchor 2, and the front large-holding power anchor 1 and the rear large-holding power anchor 2 are connected in series through a single connecting anchor chain 4, so that the entire large-holding power anchor group system is triggered to embed under the anti-catenary drag of the mooring anchor chain 3, thereby achieving a deeper embedding effect than a single large-holding power anchor, and exerting a greater load-bearing performance, and improving the overall load-bearing efficiency of the large-holding power anchor group system. In addition, since the rear large-holding power anchor 2 of the large-holding power anchor group system does not need to be configured with a separate mooring anchor chain 3, the large-holding power anchor group system only needs to be configured with a single mooring anchor chain 3, thereby saving the length of the mooring anchor chain 3 and greatly reducing the overall cost of the large-holding power anchor group system. In addition, the large-holding power anchor group system can expand the applicable sea area and improve the reliability under soft seabed conditions.

[0038] In one embodiment, the mass of the rear high-holding power anchor 2 is m1, the mass of the front high-holding power anchor 1 is m2, and 1<m1 / m2≤2; the length of the connecting anchor chain 4 is more than 5 times the length of the anchor plate 201 of the rear high-holding power anchor to avoid interference between the front high-holding power anchor 1 and the rear high-holding power anchor 2 during the embedding process.

[0039] In this way, by controlling the connection distance and mass ratio between the front high-holding power anchor 1 and the rear high-holding power anchor 2, the overall embedding performance and bearing performance of the high-holding power anchor group system can be improved.

[0040] In one embodiment,

[0041] like Figure 1 and Figure 5 As shown, the front left portion of the front large grip anchor plate 101 is provided with a front first tooth plate 103 and the front right portion is provided with a front second tooth plate 104, so that the front large grip anchor 1 forms a front double-tooth large grip anchor; the front large grip anchor shank 102 is arranged obliquely along the front upper side, as shown in FIG. Figure 1 and Figure 7 The rear end of the front large grip anchor shank 102 is fixed to the top surface of the front large grip anchor plate 101 between the front first tooth plate 103 and the front second tooth plate 104. Figure 1 and Figure 6 , the front mooring point 10201 is located at the upper position between the front first tooth plate 103 and the front second tooth plate 104, see Figure 1 The front first tooth plate 103 and the front second tooth plate 104 are arranged symmetrically. Figure 1 and Figure 5 , and the front first tooth plate 103 and the front second tooth plate 104 are both integrally arranged with the front large gripping force anchor plate 101.

[0042] Among them, Figure 7 As shown, the line between the front mooring point 10201 and the middle of the rear end of the front high-grip anchor shank 102 is called the front high-grip anchor shank center line, and the angle between the front high-grip anchor shank center line and the front high-grip anchor plate 101 is controlled between 50°-60°.

[0043] Among them, Figure 1 and Figure 2 As shown, the front end of the rear large gripping force anchor plate 201 is provided with a rear first outer tooth plate 203, a rear first inner tooth plate 204, a rear second inner tooth plate 205 and a rear second outer tooth plate 206 from left to right, so that the rear large gripping force anchor 2 forms a rear four-tooth large gripping force anchor; the rear large gripping force anchor shank includes two left and right rear first large gripping force anchor shank plates 20201 and a rear second large gripping force anchor shank plate 20202, see Figure 1-Figure 3 The first rear anchor shin plate 20201 with the largest gripping force and the second rear anchor shin plate 20202 with the largest gripping force are both arranged obliquely along the front upper side. Figure 1 and 4 The rear end of the first rear large grip anchor shin plate 20201 is fixed to the top surface of the rear large grip anchor plate 201 behind the first rear inner tooth plate 204, the rear end of the second rear large grip anchor shin plate 20202 is fixed to the top surface of the rear large grip anchor plate 201 behind the second rear inner tooth plate 205, the front end of the first rear large grip anchor shin plate 20201 and the front end of the second rear large grip anchor shin plate 20202 meet at one point and form a rear mooring point 20203, see Figure 2 , the rear mooring point 20203 is located at the upper position between the rear first inner tooth plate 204 and the rear second inner tooth plate 205, see Figure 1 .

[0044] Preferably, if Figure 2As shown, the rear first outer tooth plate 203 and the rear second outer tooth plate 206 are arranged symmetrically, the rear first inner tooth plate 204 and the rear second inner tooth plate 205 are arranged symmetrically, and the rear first outer tooth plate 203, the rear first inner tooth plate 204, the rear second inner tooth plate 205 and the rear second outer tooth plate 206 are all integrally arranged with the rear large gripping force anchor plate 201; Figure 1-Figure 3 As shown, the rear first large gripping force anchor shin plate 20201 and the rear second large gripping force anchor shin plate 20202 are arranged symmetrically, and a plurality of rear large gripping force anchor shin support plates 207 are provided between the rear first large gripping force anchor shin plate 20201 and the rear second large gripping force anchor shin plate 20202; the connecting member 105 is located in the middle and upper part of the rear end of the front large gripping force anchor plate 101, as shown in FIG. Figure 7 Preferably, there are three rear large grip anchor shank support plates 207 which are parallel to each other and arranged in the left-right direction, and the width of the rear large grip anchor shank support plate 207 from the rear mooring point 20203 to the rear large grip anchor shank support plate 201 increases in sequence, see Figure 3 .

[0045] Preferably, the line between the rear mooring point 20203 and the middle of the bottom end of the rear first large grip anchor shin 20201 is called the center line of the rear first large grip anchor shin, and the line between the rear mooring point 20203 and the middle of the bottom end of the rear second large grip anchor shin 20202 is called the center line of the rear second large grip anchor shin, and the angles between the center line of the rear first large grip anchor shin, the center line of the rear second large grip anchor shin and the rear large grip anchor plate 201 are all 50°. Figure 4 The length of the rear first inner tooth plate 204 is greater than the length of the rear first outer tooth plate 203, see Figure 2 .

[0046] Since the rear first outer tooth plate 203 and the rear second outer tooth plate 206 are arranged symmetrically on the left and right, the rear first inner tooth plate 204 and the rear second inner tooth plate 205 are arranged symmetrically on the left and right, and the rear first outer tooth plate 203, the rear first inner tooth plate 204, the rear second inner tooth plate 205 and the rear second outer tooth plate 206 are arranged at the front end of the rear large grip anchor plate 201 from left to right, and the length of the rear first inner tooth plate 204 is greater than the length of the rear first outer tooth plate 203, the two larger rear first inner tooth plates 204 and the rear second inner tooth plates 205 are located between the two shorter rear first outer tooth plates 203 and the rear second outer tooth plates 206. In this way, while improving the overall effective bearing area of ​​the large grip anchor group system, it also improves the stability of the rear large grip anchor 2 during the embedding process.

[0047] A method for installing a high-holding force anchor group system is used to install the high-holding force anchor group system, comprising the following steps:

[0048] S1. Transport the high-holding force anchor system to the designated installation sea area via the installation vessel;

[0049] S2, connecting one end of the mooring anchor chain 3 to the front mooring point 10201, connecting the front end of the connecting anchor chain 4 to the connecting piece 105, and connecting the rear end of the connecting anchor chain 4 to the rear mooring point 20203;

[0050] S3, sinking the large holding force anchor system to the seabed surface;

[0051] S4. Apply a dragging force to the mooring anchor chain 3 through the installation vessel, and keep the mooring anchor chain 3 dragged horizontally on the seabed surface. The front large-holding anchor 1 is gradually embedded in the seabed under the dragging action of the mooring anchor chain 3 and disturbs the seabed soil on the embedding trajectory. The connecting anchor chain 4 cuts the disturbed seabed soil, and the rear large-holding anchor 2 is embedded in a deeper seabed and exerts a greater bearing capacity until the embedding depth of the front large-holding anchor 1 reaches the first design depth and the embedding depth of the rear large-holding anchor 2 reaches the second design depth. Stop applying the dragging force to the mooring anchor chain 3, and complete the installation of the large-holding anchor group system.

[0052] Wherein, in step S4: the length of the rear large holding power anchor plate 201 is represented by x, and the dragging speed of the mooring anchor chain 3 is greater than or equal to (1 / 10) x meters per second and less than or equal to (1 / 2) x meters per second. Specific embodiments

[0054] When predicting the embedding depth of the high-holding anchor group system during installation, a large deformation finite element analysis model is constructed based on the coupled Euler-Lagrangian technology, the seabed soil is constructed by Euler units, and the high-holding anchor group system is constructed by Lagrangian units. A dragging force is applied to the front mooring point of the front high-holding anchor 1 through the mooring anchor chain 3, and the high-holding anchor group system is set to be towed and installed starting from the seabed surface.

[0055] In this embodiment, the mass of the rear large holding power anchor 2 is 66 tons, the mass of the front large holding power anchor 1 is 36 tons, the length of the connecting anchor chain 4 is 5 times the length of the rear large holding power anchor plate 201, and the diameter of the connecting anchor chain 4 is 0.2 meters. The dragging speed of the mooring anchor chain 3 is (1 / 4) x meters per second, where x represents the length of the rear large holding power anchor plate 201. The undrained shear strength of the seabed soil increases linearly along the depth direction, and the increase gradient of the shear strength is 1.5 kPa / meter. The shear strength of the seabed soil surface is 6 kPa. The embedding trajectory of the present large holding power anchor group system is calculated and compared with the embedding trajectory of the single rear large holding power anchor 2 when installed. The results are as follows: Figure 8 As shown, it can be seen that the large holding force anchor group system achieves a greater embedding depth.

[0056] In summary, this large-holding force anchor group system is suitable for the anchoring system of marine floating platforms in soft soil waters, and can improve the embedding depth and bearing performance in the soft seabed, and the construction and installation are convenient and reliable.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A high-holding force anchor system, characterized in that: The invention comprises a front large-holding power anchor (1) and a rear large-holding power anchor (2), wherein the front large-holding power anchor (1) comprises a front large-holding power anchor plate (101), a front large-holding power anchor shank (102) is fixed on the top surface of the front large-holding power anchor plate (101), a front mooring point (10201) is formed at the front end of the front large-holding power anchor shank (102), and the front mooring point (10201) is connected to one end of a mooring anchor chain (3). The rear large-holding power anchor (2) comprises a rear large-holding power anchor plate (201), a rear large-holding power anchor shank is fixed on the top surface of the rear large-holding power anchor plate (201), a front end of the rear large-holding power anchor shank forms a rear mooring point (20203), and a connecting piece (105) at the rear end of the front large-holding power anchor plate (101) is connected to the rear mooring point (20203) via a connecting anchor chain (4).

2. A high holding force anchor system according to claim 1, characterized in that: The mass of the rear large holding power anchor (2) is m1, the mass of the front large holding power anchor (1) is m2, and 1<m1 / m2≤2; the length of the connecting anchor chain (4) is more than 5 times the length of the anchor plate (201) of the rear large holding power anchor.

3. A high holding force anchor system according to claim 1, characterized in that: The front left portion of the front high-grip anchor plate (101) is provided with a front first tooth plate (103) and the front right portion is provided with a front second tooth plate (104), so that the front high-grip anchor (1) forms a front double-tooth high-grip anchor; the front high-grip anchor shank (102) is arranged obliquely along the front upper side, the rear end of the front high-grip anchor shank (102) is fixed to the top surface of the front high-grip anchor plate (101) between the front first tooth plate (103) and the front second tooth plate (104), and the front mooring point (10201) is located at an upper position between the front first tooth plate (103) and the front second tooth plate (104).

4. A high holding force anchor system according to claim 3, characterized in that: The front first tooth plate (103) and the front second tooth plate (104) are arranged symmetrically on the left and right, and the front first tooth plate (103) and the front second tooth plate (104) are both integrally arranged with the front large-grip anchor plate (101).

5. A high holding force anchor system according to claim 4, characterized in that: The line between the front mooring point (10201) and the middle of the rear end of the front high-grip anchor shank (102) is called the center line of the front high-grip anchor shank (102), and the angle between the center line of the front high-grip anchor shank (102) and the front high-grip anchor plate (101) is controlled between 50° and 60°.

6. A high holding force anchor system according to claim 4, characterized in that: The front end of the rear large gripping force anchor plate (201) is provided with a rear first outer tooth plate (203), a rear first inner tooth plate (204), a rear second inner tooth plate (205) and a rear second outer tooth plate (206) in sequence from left to right, so that the rear large gripping force anchor (2) forms a rear four-tooth large gripping force anchor; the rear large gripping force anchor shank comprises two left and right rear first large gripping force anchor shank plates (20201) and a rear second large gripping force anchor shank plate (20202), the rear first large gripping force anchor shank plate (20201) and the rear second large gripping force anchor shank plate (20202) are both arranged obliquely along the front upper side, the rear first large gripping force anchor shank The rear end of the plate (20201) is fixed to the top surface of the rear high-grip anchor plate (201) on the rear side of the first rear inner tooth plate (204), the rear end of the second rear high-grip anchor shin plate (20202) is fixed to the top surface of the rear high-grip anchor plate (201) on the rear side of the second rear inner tooth plate (205), the front end of the first rear high-grip anchor shin plate (20201) and the front end of the second rear high-grip anchor shin plate (20202) meet at one point to form a rear mooring point (20203), and the rear mooring point (20203) is located at the upper position between the first rear inner tooth plate (204) and the second rear inner tooth plate (205).

7. A high holding force anchor system according to claim 6, characterized in that: The first rear outer tooth plate (203) and the second rear outer tooth plate (206) are arranged symmetrically on the left and right, and the first rear inner tooth plate (204) and the second rear inner tooth plate (205) are arranged symmetrically on the left and right, and the first rear outer tooth plate (203), the first rear inner tooth plate (204), the second rear inner tooth plate (205) and the second rear outer tooth plate (206) are all arranged integrally with the rear large grip anchor plate (201); the first rear large grip anchor shin plate (20201) and the second rear large grip anchor shin plate (20202) are arranged symmetrically on the left and right, and a plurality of rear large grip anchor shin support plates (207) are provided between the first rear large grip anchor shin plate (20201) and the second rear large grip anchor shin plate (20202); the connecting piece (105) is located at the middle and upper part of the rear end of the front large grip anchor plate (101).

8. A high holding force anchor system according to claim 7, characterized in that: The line between the rear mooring point (20203) and the middle of the bottom end of the rear first large grip anchor shin (20201) is called the center line of the rear first large grip anchor shin (20201), and the line between the rear mooring point (20203) and the middle of the bottom end of the rear second large grip anchor shin (20202) is called the center line of the rear second large grip anchor shin (20202). The angles between the center lines of the rear first large grip anchor shin (20201), the center lines of the rear second large grip anchor shin (20202) and the rear large grip anchor plate (201) are all 50°; the length of the rear first inner tooth plate (204) is greater than the length of the rear first outer tooth plate (203).

9. A method for installing a high-holding force anchor system, used for installing the high-holding force anchor system according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. transporting the large holding force anchor group system to the designated installation sea area by means of an installation vessel; S2, connecting one end of the mooring anchor chain (3) to the front mooring point (10201), connecting the front end of the connecting anchor chain (4) to the connecting piece (105), and connecting the rear end of the connecting anchor chain (4) to the rear mooring point (20203); S3, sinking the large holding force anchor system to the seabed surface; S4. A dragging force is applied to the mooring anchor chain (3) by the installation vessel, and the mooring anchor chain (3) is kept dragged in the horizontal direction on the seabed surface. Under the dragging action of the mooring anchor chain (3), the front large-holding anchor (1) gradually embeds into the seabed and disturbs the seabed soil on the embedding trajectory path. The connecting anchor chain (4) cuts the disturbed seabed soil. The rear large-holding anchor (2) embeds into a deeper seabed and exerts a greater bearing capacity until the embedding depth of the front large-holding anchor (1) reaches the first design depth and the embedding depth of the rear large-holding anchor (2) reaches the second design depth. Then, the dragging force is stopped on the mooring anchor chain (3), and the installation of the large-holding anchor group system is completed.

10. The method for installing a high-holding force anchor system according to claim 9, characterized in that: In step S4: the length of the rear large holding power anchor plate (201) is represented by x, and the dragging speed of the mooring anchor chain (3) is greater than or equal to (1 / 10) x meters per second and less than or equal to (1 / 2) x meters per second.

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