CN114408097B

CN114408097B - Wing panel towing anchor

Info

Publication number: CN114408097B
Application number: CN202210076834.5A
Authority: CN
Inventors: 于龙; 郭岩岩; 张荷月
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2023-03-17
Anticipated expiration: 2042-01-24
Also published as: CN114408097A

Abstract

The invention belongs to the field of ocean platforms, and relates to a wing panel drag anchor. The novel wing panel drag anchor is suitable for a floating ocean platform, provides larger submerging depth for the drag anchor in the submerging process, and provides larger bearing capacity for an anchoring system on the basis of not increasing the cost compared with the traditional drag anchor, so that the mooring foundation is more stable and reliable.

Description

Wing panel drag anchor

Technical Field

The invention belongs to the field of ocean platforms, and relates to a wing panel drag anchor.

Technical Field

The ocean platform needs to determine and fix the position of the ocean platform in order to carry out relevant operation in a specific sea area, and the depth of the towing anchor anchored into the seabed soil body in the towing process of the anchor chain has very important significance for the anchor body fixing. At present, as offshore oil and gas resources are continuously developed to deep water and ultra-deep water, the drag anchor is widely applied to deep sea engineering. As a novel mooring foundation, the mooring structure has the advantages of high uplift bearing capacity, high anchoring performance, light weight, material saving, easiness in operation, easiness in storage, recoverability, reusability and the like.

The anchor shank design form of tradition drag anchor is the inclination anchor shank, connects with several blocks of floor between two anchor shanks, drags anchor board and anchor shank and becomes certain angle, draws through the anchor chain and draws and make anchor board and seabed soil produce the cutting effect with certain angle to realize that the installation of anchor in soil is submerged. When the towing anchor is installed and submerged, only the anchor plate and soil are cut so as to provide the submergence capacity, and the traditional anchor shank cannot help submergence but has the effect of hindering submergence. The invention provides a novel wing-shaped towing anchor, which changes the form of the towing anchor, does not use the traditional anchor shank combination any more, adds a pair of wing-shaped plates capable of generating auxiliary cutting action on the anchor plate, and the wing-shaped plates are symmetrically arranged outwards by taking the anchor plate as a central line, so that the wing-shaped plates can also generate the cutting action in the process of the towing anchor submergence.

Disclosure of Invention

The invention provides a novel towing anchor which uses an airfoil plate to provide an auxiliary cutting effect for the towing anchor.

The technical scheme of the invention is as follows:

a wing panel drag anchor comprises an anchor plate, a wing panel and a drag anchor chain;

one end of each of the two extroversion wing-shaped plates is fixed on the upper surface of the anchor plate, the two extroversion wing-shaped plates are connected through a rib, and the other ends of the wing-shaped plates are connected with the traction anchor chain.

Taking a vertical plane vertical to the upper surface of the anchor plate as a reference plane, wherein the intersection line of the reference plane and the anchor plate is taken as an axis, an included angle alpha in the clockwise direction around the axis is positive, and an included angle alpha in the anticlockwise direction is negative; the included angle alpha between the plane of the wing plate 2 and the plane vertical to the anchor plate is 0-21.5 degrees.

The theoretical basis of the invention is as follows: the symmetrical wing-shaped plates are added on the anchor plate, in the process of submerging the towing anchor, the wing-shaped plates are obliquely placed outwards, so that the front end of the wing-shaped plates can be anchored into a seabed conveniently, the wing-shaped plates and the anchor plate jointly generate a cutting effect, the overall submerging capacity of the towing anchor is improved, and a larger bearing capacity is provided for a mooring foundation, so that the towing anchor can be exerted to the maximum extent.

The invention has the beneficial effects that:

examples of the invention are applicable to floating ocean platforms. New-type aerofoil drag anchor provides bigger dive degree of depth for drag anchor dive in-process, compares in traditional drag anchor, on the basis that does not increase the cost, provides bigger bearing capacity for the anchor system, makes the mooring basis more reliable and more stable.

Drawings

FIG. 1 is an overall block diagram of a novel airfoil plate drag anchor apparatus of an embodiment of the present invention;

FIG. 2 is a top plan view of the novel airfoil drag anchor apparatus of an embodiment of the present invention;

FIG. 3 is a rear elevational view of the novel airfoil plate drag anchor apparatus of an embodiment of the present invention;

FIG. 4 is a simplified model of a half of the symmetric tow anchor modeling;

FIG. 5 is a schematic view of the anchor plate defining an angle α with a vertical plane perpendicular to the upper surface of the anchor plate;

FIG. 6 is a graph of horizontal towing displacement versus vertical embedment depth for different alpha angles, i.e., embedment trajectory for the tow anchor;

FIG. 7 is a distribution rule of the relationship between the alpha angle and the embedding depth of a towing anchor at a certain moment;

in the figure: 1, anchor plate; 2. an airfoil plate; 3, dragging the anchor chain.

Detailed Description

The following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings.

Example 1

The included angle alpha between the plane of the wing-shaped plate and the plane of the vertical anchor plate is 0-21.5 degrees, a better diving result can be obtained, the diving performance of the drag anchor can be greatly improved compared with the conventional drag anchor which is used at present and corresponds to alpha >0, and the alpha value is determined by analyzing the CEL method of abaqus finite element software, which can be seen as follows:

the motion process of the drag anchor under the traction of the anchor chain is established by carrying out simulation on the existing MK5 drag anchor corresponding to the drag anchor of the type 15t, the simulation anchor chain is connected according to the cylinder modeling link unit, and the specific size of the drag anchor in the numerical simulation can be shown in an attached figure 4 and a table 1.

TABLE 1 numerical simulation drag anchor size

The motion process of the towing anchor is simulated by using different alpha values to obtain the track displacement corresponding to different alpha angles and a fitting relation curve between the embedding displacement of the towing anchor plate and alpha, which can be seen in the attached figures 6 and 7.

According to the results shown in FIG. 7, the towing anchor has a large embedding displacement when the alpha range is-21.5 degrees to 0 degrees, namely, the angle of the range can improve the embedding performance of the towing anchor to the maximum extent. Therefore, the alpha value is determined by taking the alpha value as a standard.

Example 2

(1) The drag anchor is first thrown into the sea and sunk to the surface of the seabed.

(2) And dragging the towing anchor chain 3 by using the towing installation ship to tow the towing anchor so that the towing anchor is submerged to the target depth.

(3) And tensioning the traction anchor chain 3 to complete the installation process of the drag anchor.

Example 3:

a wing panel towing anchor comprises an anchor plate 1, a wing panel 2 and a towing anchor chain 3;

one end of each of the two camber airfoil profiles 2 is fixed on the upper surface of the anchor plate 1, the two camber airfoil profiles 2 are connected through ribs, and the other ends of the airfoil profiles 2 are connected with the traction anchor chain 3.

Taking a vertical plane perpendicular to the upper surface of the anchor plate 1 as a reference plane, wherein the intersection line of the reference plane and the anchor plate 1 is taken as an axis, the clockwise included angle alpha around the axis is positive, and the counterclockwise included angle alpha is negative; the included angle alpha between the plane of the wing plate 2 and the plane vertical to the anchor plate 1 is 0-21.5 degrees.

The principle and the embodiment of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. A wing panel drag anchor is characterized by comprising an anchor plate (1), a wing panel (2) and a drag anchor chain (3);

one end of each of the two camber airfoil profiles (2) is fixed on the upper surface of the anchor plate (1), the two camber airfoil profiles (2) are connected through a rib, and the other end of each airfoil (2) is connected with a traction anchor chain (3);

determining a vertical plane perpendicular to the upper surface of the anchor plate (1) by using the intersection line of the wing plate and the anchor plate as a reference plane, wherein the reference plane extends along the direction perpendicular to the paper surface, the intersection line of the wing plate and the anchor plate (1) is taken as an axis, the included angle alpha is rotated around the intersection line to the direction of the symmetric axis of the anchor is positive, and the included angle alpha is rotated away from the direction of the symmetric axis of the anchor is negative; the included angle alpha between the plane of the wing plate (2) and the reference plane of the vertical anchor plate (1) is less than 0 degree and is more than or equal to-21.5 degrees.