CN114408096B - Detachable and reusable towing anchor submersible vehicle - Google Patents

Abstract

The invention belongs to the field of ocean platforms and relates to a detachable and reusable towed anchor submersible. The towed anchor submersible aid includes an anchor plate, an anchor shin, and a shin plate; the two shin plates are respectively placed on both sides of the anchor shin to form a submersible aid; the two shin plates are connected by a plurality of ribs; The adjacent ribs are arranged in parallel. The invention is suitable for helping the towed anchor of the floating ocean platform to have stronger diving ability. The detachable submersible is only used as an auxiliary tool when the towed anchor is installed and dived. After the installation of the towed anchor is completed, it can be disassembled, recovered and reused. The submersible aid can deepen the embedding depth of the towed anchor, making the mooring foundation more stable and safe.

Description

A detachable and reusable towed anchor submersible

technical field

The invention belongs to the field of ocean platforms and relates to a detachable and reusable towed anchor submersible.

technical background

In recent years, the depth of marine exploration has gradually entered the field of deep water and ultra-deep water, which puts forward higher requirements for marine mooring systems. Deep water mooring foundation is an important component of deep water mooring system. With the accelerated development of offshore oil and gas resources development, the key technology of deep water mooring system has become an important research field of international offshore oil and gas resources development. As a new type of mooring foundation, the drag anchor 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 traditional towing anchor is to assemble the anchor shin on the anchor plate and embed it into the seabed under the traction of the towing anchor installation ship. After the towing is completed, the anchor is left on the seabed for mooring work. The anchor plate and the anchor shin of the traditional dragging anchor form a certain angle, and the anchor plate and the seabed soil produce a cutting action at a certain angle through the pulling of the anchor chain, so as to realize the submersion of the anchor in the soil. Under general geological conditions, the deeper the anchor is embedded in the soil, the greater the bearing capacity the anchor can provide. The traditional towed anchor only realizes the towed submersion through the anchor's own submersion ability, and the final submerged depth is limited. The present invention proposes a method of adding a pair of detachable flared shin plates on both sides of the anchor shin as a submersible aid, which produces a greater cutting effect and enables the entire dragging anchor to have a greater dive capability.

Contents of the invention

In order to solve the above technical problems, the present invention provides a detachable and reusable towed anchor submersible.

Technical scheme of the present invention is as follows:

A detachable and reusable towed anchor submersible device, including an anchor plate, an anchor shin, and a shin plate; the two shin plates are respectively placed on both sides of the anchor shin to form a submersible aid; A plurality of ribs are connected; adjacent ribs are arranged in parallel.

The anchor shin is fixed above the anchor plate, and one end of the two shin plates is connected to the anchor plate respectively; The angle between the surfaces is defined as α, where the intersection of the datum plane and the anchor plate is taken as 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 included angle α of the plane of the plate is 0°～-21.5°.

The detachable and recoverable shin plate is called a towed anchor submersible. The submersible aid can make the towed anchor have stronger submergence performance, thus providing higher bearing capacity. Based on the traditional towed anchor, two shin plates are placed on both sides of the anchor shin to form a submersible aid. The shape of the submersible aid remains the same as that of the anchor shin. Install.

In the towed anchor, the vertical plane perpendicular to the upper surface of the anchor plate is taken as the datum plane, and the angle between the shin plate of the submersible aid and the datum plane is defined as α, where the intersection line of the datum plane and the anchor plate is taken as the axis, and clockwise The included angle α in the direction is positive, and the included angle α in the counterclockwise direction is negative, and its specific definition can be found in Figure 5.

Beneficial effects of the present invention:

The invention is suitable for helping the towed anchor of the floating ocean platform to have stronger diving ability. The detachable submersible is only used as an auxiliary tool when the towed anchor is installed and dived. After the installation of the towed anchor is completed, it can be disassembled, recovered and reused. The submersible aid can deepen the embedding depth of the towed anchor, making the mooring foundation more stable and safe.

Description of drawings

Fig. 1 is an overall structural diagram of a dragging anchor thruster device according to an embodiment of the present invention;

Fig. 2 is a top view of the towed anchor thruster device according to the embodiment of the present invention;

Fig. 3 is a rear view of the towed anchor thruster device according to 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 shin plate (submersible aid); 3 anchor shin; 4 install anchor chain; 5 load 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:

A detachable and reusable towed anchor submersible aid, comprising an anchor plate 1, an anchor shin 3, and a shin plate 2; the two shin plates 2 are placed on both sides of the anchor shin to form a submersible aid; the two shin plates The plates 2 are connected by a plurality of ribs; adjacent ribs are arranged in parallel.

The anchor shin 3 is fixed above the anchor plate 1, and one end of the two shin plates 2 is connected to the anchor plate 1 respectively; The angle between the shin plate 2 and the reference plane is defined as α, where the intersection of the reference plane and the anchor plate 1 is taken as 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 included angle α between the plane of the shin plate and the plane perpendicular to the anchor plate is 0°～-21.5°.

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 and install the anchor chain 4, tow the submersible aid 2 and the towed anchor, so that the submersible aid ② and the towed anchor dive to the target depth.

(3) Disconnect the connection between the submersible aid 2 and the towed anchor, and recover the submersible aid by installing the anchor chain 4 .

(4) Tension the bearing anchor chain 5 to complete the installation process of the dragging anchor.

Example 3:

At this time, the angle α between the shin plate plane of the submersible aid and the plane of the vertical anchor plate is 0° to -21.5°, which can get the best diving result and give full play to the diving performance of the towed anchor. The value is determined according to abaqus The CEL method of the finite element software is used for analysis, and the details can be seen as follows:

Through the simulation of the existing MK5 model 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 cylindrical link unit is used to simulate the anchor chain. The specific size of the towed anchor in the numerical simulation can be seen in Figure 4 and Table 1 below.

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.

The submersible aid is connected with the original towed anchor by a detachable device, and the submersible aid and the original towed anchor are respectively towed by two anchor chains: the installation anchor chain is only connected to the submersible aid; the load-bearing anchor chain is only connected to the towed anchor. Pull and install the anchor chain during the installation operation. At this time, the submersible aid and the towed anchor are connected as a whole, and the anchor chain is installed to drag the submersible aid and the towed anchor to dive together; after diving to the specified depth, control the submersible aid and the towed anchor Separate, drag and install the anchor chain to recover the submersible aid; finally tension the load-bearing anchor chain to complete the installation process of the drag anchor.

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. A towing anchor submersible vehicle capable of being detached and reused is characterized by comprising an anchor plate (1), an anchor shank (3) and a shank plate (2); the two shin plates (2) are respectively arranged on two sides of the anchor shin to form a diving aid; the two shin plates (2) are connected through a plurality of ribs; the adjacent ribs are arranged in parallel;

the anchor shank (3) is fixed above the anchor plate (1), and one end of each of the two shank plates (2) is connected with the anchor plate (1);

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

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