CN114408097B - Wing panel towing anchor - Google Patents

Abstract

The invention belongs to the field of ocean platforms and relates to an airfoil dragging anchor. The example of the present invention is suitable for floating ocean platforms. The new airfoil dragging anchor provides a greater diving depth for the dragging anchor during the submersion process. Compared with the traditional dragging anchor, it is an anchoring The system provides greater bearing capacity, making the mooring foundation more stable and reliable.

Description

An airfoil drag anchor

technical field

The invention belongs to the field of ocean platforms and relates to an airfoil dragging anchor.

technical background

In order to be able to carry out relevant operations in specific sea areas, the offshore platform needs to determine and fix its position. The depth of the towed anchor anchored into the seabed soil during the anchor chain towing process is of great significance for the anchor body fixation. At present, with the continuous development of offshore oil and gas resources to deep water and ultra-deep water, towed anchors have been widely used in deep sea engineering. As a new type of mooring foundation, it not only has high uplift bearing capacity and efficient anchoring performance, but also has the advantages of light weight, material saving, easy operation, easy storage, recyclability and repeated use.

The anchor shin of the traditional dragging anchor is designed in the form of an inward anchor shin. Several ribs are connected between the two anchor shin. The angle produces a cutting action, thereby enabling the anchor to be installed submerged in the soil. When the towed anchor is installed and submerged, only the anchor plate and the soil are cut to provide the submersible ability. The traditional anchor shin not only cannot help the submersion, but hinders the submersion. The present invention proposes a new type of airfoil dragging anchor, which changes the form of the dragging anchor, instead of using the traditional anchor shin combination, and adds a pair of airfoil plates that can produce auxiliary cutting effect on the anchor plate, and the airfoil plate is based on the anchor plate The center line is placed symmetrically and outwardly, so that the airfoil can also produce cutting action during the submersion of the towed anchor. Compared with the traditional towed anchor, this new type of towed anchor has stronger dive performance, thus providing greater bearing capacity.

Contents of the invention

The invention provides a new type of dragging anchor which uses airfoils to provide auxiliary cutting effect for the dragging anchor. By adding a pair of cambered airfoils, the submergence ability of the dragging anchor can be improved, and a larger anchoring system can be provided. Bearing capacity, it can be used for fixing the mooring foundation of floating offshore platforms.

Technical scheme of the present invention:

An airfoil dragging anchor, comprising an anchor plate, an airfoil, and a traction anchor chain;

One end of the two outwardly inclined airfoils is respectively fixed on the upper surface of the anchor plate, the two outwardly inclined airfoils are connected by ribs, and the other end of the airfoils is connected to the traction anchor chain.

Take the vertical plane perpendicular to the upper surface of the anchor plate as the reference plane, where the intersection line between the reference plane and the anchor plate is the axis, the angle α in the clockwise direction around the axis is positive, and the angle α in the counterclockwise direction is negative; 2 The angle α between the plane and the plane perpendicular to the anchor plate is 0° to -21.5°.

The theoretical basis of the present invention is: a symmetrical airfoil plate is added to the anchor plate. During the submersion process of dragging the anchor, the airfoil plate is tilted outwards to facilitate the front end to anchor into the seabed. The airfoil plate and the anchor plate jointly produce a cutting effect. Improve the overall submersible capacity of the towed anchor, provide greater bearing capacity for the mooring foundation, so that the role of the towed anchor can be maximized.

Beneficial effects of the present invention:

Examples of the present invention are applicable to floating marine platforms. The new airfoil dragging anchor provides a greater diving depth for the dragging anchor during the submersion process. Compared with the traditional dragging anchor, it provides a greater bearing capacity for the anchoring system without increasing the cost, making the system The mooring foundation is more stable and reliable.

Description of drawings

Fig. 1 is the overall structural diagram of the novel airfoil dragging anchor device of the embodiment of the present invention;

Fig. 2 is the top view of the novel airfoil dragging anchor device of the embodiment of the present invention;

Fig. 3 is the rear view of the novel airfoil dragging anchor device of the embodiment of the present invention;

Figure 4 is a simplified model of half of the symmetrical towed anchor modeling;

Fig. 5 is a schematic diagram of the definition of the angle α between the anchor plate and the vertical plane perpendicular to the upper surface of the anchor plate;

Fig. 6 is a graph of the relationship between the horizontal traction displacement and the vertical embedding depth corresponding to different α angles, that is, the embedding trajectory of the towed anchor;

Figure 7 shows the distribution law of the relationship between the α angle and the embedding depth of the towed anchor at a certain moment;

In the figure: 1. Anchor plate; 2. Airfoil plate; 3. Traction anchor chain.

Detailed ways

The specific implementation manner of the present invention will be described in detail below in combination with the technical scheme and accompanying drawings.

Example 1

The included angle α between the plane of the airfoil and the plane of the vertical anchor plate is 0° to -21.5°, which can get better diving results. To improve the diving performance of the towed anchor, the determination of the α value is analyzed by the CEL method of the abaqus finite element software. The details can be seen as follows:

Through the simulation of the existing MK5 towed anchor corresponding to the 15t model towed anchor, the movement process of the towed anchor under the traction of the anchor chain is established, and the simulated anchor chain is connected according to the link unit of the cylinder modeling. The specific size of the towed anchor in the numerical simulation See accompanying drawing 4 and table 1.

Table 1 Numerical simulation towed anchor dimensions

The movement process of the towed anchor is simulated with different α values, and the trajectory displacements corresponding to different α angles are obtained, as well as the fitting relationship curve between the embedded displacement of the towed anchor plate and α, as shown in Figures 6 and 7 for details.

According to the results in Fig. 7, when α ranges from -21.5° to 0°, there is a large embedding displacement of the towed anchor, that is, this range of angles can maximize the embedding performance of the towed anchor. Therefore, use this as a standard to determine the value of α.

Example 2

(1) First throw the towed anchor into the sea and sink it to the surface of the seabed.

(2) Use the towing installation ship to tow the traction anchor chain 3 and tow the tow anchor so that the tow anchor dives to the target depth.

(3) Tension the traction anchor chain 3 to complete the installation process of the traction anchor.

Example 3:

An airfoil dragging anchor, comprising an anchor plate 1, an airfoil 2 and a traction anchor chain 3;

One end of the two cambered airfoils 2 is respectively fixed on the upper surface of the anchor plate 1, the two cambered airfoils 2 are connected by ribs, and the other end of the cambered airfoils 2 is connected with the traction anchor chain 3 connected.

Take the vertical plane perpendicular to the upper surface of the anchor plate 1 as the reference plane, where the intersection line between the reference plane and the anchor plate 1 is the axis, the angle α in the clockwise direction around the axis is positive, and the angle α in the counterclockwise direction is negative; The angle α between the plane of the shaped plate 2 and the plane perpendicular to the anchor plate 1 is 0° to -21.5°.

In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to the present invention Thoughts, there will be changes in specific implementation methods and application ranges. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (1)

1. An airfoil dragging anchor is characterized in that it comprises an anchor plate (1), an airfoil (2) and a traction anchor chain (3); One ends of the two outwardly inclined airfoils (2) are respectively fixed on the upper surface of the anchor plate (1), and the two outwardly inclined airfoils (2) are connected by ribs, and the two outwardly inclined airfoils (2) are connected by ribs. The other end is connected with the traction anchor chain (3); The vertical plane perpendicular to the upper surface of the anchor plate (1) determined by the intersection line of the airfoil plate and the anchor plate is taken as the reference plane, and the reference plane extends along the direction perpendicular to the paper, wherein the intersection line between the airfoil plate and the anchor plate (1) is axis, the included angle α is positive when turning around the intersection line to the axis of symmetry of the anchor, and the included angle α is negative when rotating away from the axis of symmetry of the anchor; the included angle α between the plane of the wing plate (2) and the reference plane perpendicular to the anchor plate (1) Less than 0°, greater than or equal to -21.5°.

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