JP6750324B2 - Submarine mooring structure - Google Patents

Description

The present invention relates to a bottom mooring structure.

2. Description of the Related Art In recent years, a technique related to a water bottom mooring structure having a device for observing an underwater environment (hereinafter, also referred to as "observation-related device") is known. For example, a water bottom mooring having an observation-related device, a weight member, a cable connecting the observation-related device and the weight member, a separator capable of separating the observation-related device and the weight member, and a buoy attached to the cable. A technique related to a structure is disclosed (for example, see Patent Document 1).

In such a technique, when the observation of the underwater environment is completed, a predetermined signal is transmitted into the water by sound waves. When the separator detects the predetermined signal, the separator separates the weight member from the observation related equipment. After the weight member and the observation-related equipment are separated, the water bottom mooring structure excluding the weight member floats due to the buoyancy of the buoy. The water bottom mooring structure excluding the weight member is recovered by the user when it floats on the water surface.

International Publication No. 2013-039048

However, it is considered that the water bottom mooring structure excluding the weight member floats in the water in a substantially upward direction due to the buoyancy of the buoy. At this time, interference may occur between a plurality of constituents of the bottom mooring structure on the water surface or in water. Interference between multiple components can also cause damage to the components. Therefore, it is desired to provide a technique capable of reducing the possibility that a plurality of components forming the underwater mooring component interfere with each other.

In order to solve the above problems, according to one aspect of the present invention, a buoyant body that receives a predetermined buoyancy in water, an observation-related device related to observation of an underwater environment, and a first device connected to the observation-related device. Cable, a second cable that connects the buoyancy body and the observation-related equipment, a disconnecting portion that can separate the weight member installed on the water bottom and the first cable, and a water flow when floating in water. A flow receiving portion having a flow receiving surface for receiving the flow receiving portion, the flow receiving portion being present at a position opened at a predetermined angle with respect to the first cable, and receiving the water flow when settling in water, A bottom mooring structure is provided that rotates in a closing direction relative to a first cable .
According to another aspect of the present invention, a buoyant body that receives a predetermined buoyancy in water, an observation-related device related to observation of an underwater environment, a first cable connected to the observation-related device, and A second cable that connects the buoyant body and the observation-related equipment, a detachable portion that can detach the weight member installed on the water bottom from the first cable, and a receiving surface that receives a water flow when floating in water. And a flow receiving portion having a flow receiving portion having a predetermined angle opened with respect to the first cable, when the flow receiving surface receives a water flow during floating in water, A bottom mooring structure is provided that rotates in an opening direction relative to a first cable.

The bottom mooring structure may include a stop member that stops the flow receiving part so as not to open beyond the predetermined angle with respect to the first cable.

The flow receiving unit may be directly or indirectly attached to any one of the observation related device, the first cable, the second cable, and the disconnecting unit.

The flow receiving surface may have a flat surface or a curved surface.

The predetermined angle may be an acute angle or an obtuse angle.

The disconnecting section may disconnect the weight member and the first cable when a predetermined signal is detected.

As described above, according to the present invention, it is possible to reduce the possibility that a plurality of components forming the bottom mooring component interfere with each other.

It is a figure for demonstrating operation|movement at the time of underwater floating of a general bottom mooring structure. It is a figure for demonstrating operation|movement at the time of underwater floating of a general bottom mooring structure. It is a figure for demonstrating operation|movement at the time of underwater floating of a general bottom mooring structure. It is a figure for demonstrating operation|movement at the time of underwater floating of a general bottom mooring structure. It is a figure for demonstrating operation|movement at the time of underwater floating of a general bottom mooring structure. It is a figure which shows the schematic structural example of the water bottom mooring structure which concerns on this embodiment. It is a figure which shows the example of the state which the flow receiving part rotated to the direction which opens with respect to a cable. It is a figure which shows the example of the state which the flow receiving part rotated to the direction which closes with respect to a cable. It is a figure for demonstrating operation|movement at the time of submergence of a water bottom mooring structure. It is a figure for demonstrating operation|movement at the time of submergence of a water bottom mooring structure. It is a figure for demonstrating operation|movement at the time of submergence of a water bottom mooring structure. It is a figure for demonstrating operation|movement at the time of submergence of a water bottom mooring structure. It is a figure for demonstrating operation|movement at the time of floating in the water of a water bottom mooring structure. It is a figure for demonstrating operation|movement at the time of floating in the water of a water bottom mooring structure. It is a figure for demonstrating operation|movement at the time of floating in the water of a water bottom mooring structure. It is a figure for demonstrating operation|movement at the time of floating in the water of a water bottom mooring structure. It is a figure for demonstrating operation|movement at the time of floating in the water of a water bottom mooring structure. It is a figure which shows the example of the state which the flow receiving part which concerns on a 1st modification rotated in the direction which opens with respect to a cable. It is a figure which shows the example of the state which the flow receiving part which concerns on a 1st modification rotated in the direction which closes with respect to a cable. It is a figure which shows the example of the state which the flow receiving part which concerns on a 2nd modification rotated in the direction which opens with respect to a cable. It is a figure which shows the example of the state which the flow receiving part which concerns on a 2nd modification rotated in the direction which closes with respect to a cable.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, and duplicate description will be omitted.

In addition, in the present specification and the drawings, a plurality of constituent elements having substantially the same functional configuration are distinguished by attaching different numbers after the same reference numerals. In addition, similar components of different embodiments are distinguished by attaching different alphabets after the same reference numerals. However, when it is not necessary to specifically distinguish each of a plurality of constituent elements having substantially the same functional configuration, only the same reference numeral is given.

(0. Background)
First, the background of the embodiment of the present invention will be described. 2. Description of the Related Art In recent years, a technique relating to a water bottom mooring structure having a device for observing an underwater environment (hereinafter, also referred to as "observation-related device") is known. 1A to 1E are diagrams for explaining the operation of a general water bottom mooring structure during floating in water. As shown in FIG. 1A, the bottom mooring structure 90 includes a buoyant body 30, an observation-related device 40, a cable 50-1, a cable 50-2, a disconnecting section 20, and a weight member 60. Below, each of these structures which the bottom mooring structure 90 has may be called a "structure."

As shown in FIG. 1A, in the state in which the weight member 60 and the cable 50-1 are connected, the water bottom mooring structure 90 has more gravity than the buoyancy force that the water bottom mooring structure 90 receives. Is larger, so it sinks in water. Eventually, the bottom mooring structure 90 reaches the bottom and is moored to the bottom. When the observation of the underwater environment is completed, a predetermined signal is transmitted underwater. When the separation unit 20 detects a predetermined signal, the separation unit 20 separates the weight member 60 and the cable 50-1.

When the weight member 60 and the cable 50-1 are separated, as shown in FIG. 1B, the water bottom mooring structure 90 excluding the weight member 60 has a larger buoyancy than gravity, so that it floats in water. Go. The bottom mooring structure 90 excluding the weight member 60 is recovered by the user when it floats on the water surface. On the other hand, the weight member 60 is left behind on the bottom of the water.

At this time, it is considered that the water bottom mooring structure 90 excluding the weight member 60 floats in the water in a substantially right above direction. The smaller the horizontal water flow, the closer the floating direction of the bottom mooring structure 90 is to the upward direction. Here, the difference between the buoyancy force and the gravitational force that the underwater mooring structure 90 receives is considered to be different for each of the constituents of the underwater mooring structure 90, and thus the levitation speed may be different for each structural body.

For example, since the volume of the observation-related equipment 40 is larger than the volume of the cables 50-1 and 50-2, the buoyancy of the observation-related equipment 40 is larger than that of the cables 50-1 and 50-2. it is conceivable that. Therefore, it is considered that the observation-related equipment 40 has a larger buoyancy force with respect to gravity (that is, a higher floating speed) than the cables 50-1 and 50-2.

Due to such a difference in levitation speed for each structure, the plurality of structures forming the water bottom mooring structure 90 may interfere with each other when they float substantially right above. Specifically, when the water bottom mooring structure 90 excluding the weight member 60 floats in a substantially upward direction, the water bottom mooring structure 90 is floating during floating as shown in FIG. 1C due to the difference in the floating speed of each structure. Interference may occur between the multiple constituents of the.

When the buoyancy body 30 reaches the surface of the water regardless of whether or not there is a difference in the levitation speed for each structure, as shown in FIG. 1D, among the plurality of structures forming the underwater mooring structure 90. Interference can occur. Further, regardless of whether or not there is a difference in levitation speed for each structure, when all the water bottom mooring structures 90 excluding the weight member 60 reach the water surface, as shown in FIG. 1E, the water bottom mooring structure 90 is removed. Interference can occur between the constituent components.

Interference between the components that make up the bottom mooring component 90 can also cause damage to the components. In particular, since a structure used in water is required to have high watertightness, damage to the structure used in water puts a heavy burden on maintenance work.

Moreover, it is considered that as the depth from the water surface increases, the horizontal water flow becomes smaller, while the floating speed of the structure becomes higher. Therefore, it is considered that as the depth from the water surface increases, interference is more likely to occur between the multiple constituents of the underwater mooring constituent 90. Therefore, it is considered that the structure is more likely to be damaged as the depth from the water surface increases.

Therefore, in the present specification, a technique capable of reducing the possibility that the plurality of constituent members of the bottom mooring structure 90 interfere with each other will be mainly described. In addition, by reducing the possibility that the plurality of components forming the underwater mooring structure 90 interfere with each other, the possibility that the components will be damaged is also reduced, and the cable 50-1 or the cable 50-2 is not It is considered that the possibility of being entangled in the structure of is reduced.

(1. Details of the embodiment)
Next, details of the present embodiment will be described.

(1-1. Description of configuration)
First, the configuration of the bottom mooring structure according to the present embodiment will be described. FIG. 2 is a diagram showing a schematic configuration example of the water bottom mooring structure according to the present embodiment. As illustrated in FIG. 2, the water bottom mooring structure 1 according to the present embodiment includes a buoyant body 30, an observation-related device 40, a cable 50-1, a cable 50-2, a disconnecting portion 20, and a weight member 60. Have and. Further, in the present embodiment, the water bottom mooring structure 1 includes the flow receiving portion 10 (flow receiving portion 10A). Below, each of these structures which the bottom mooring structure 1 has may be called a "structure."

In addition, in this embodiment, the case where the bottom mooring structure 1 is moored especially to the seabed will be mainly described. However, the place where the underwater mooring structure 1 is moored is not limited to the seabed. For example, the submarine mooring structure 1 may be moored to the river bottom, to the lake bottom, to the bottom of a pool, or the like.

The buoyancy body 30 receives a predetermined buoyancy in water. More specifically, the buoyancy body 30 receives buoyancy larger than gravity in water. For example, the buoyancy body 30 may be a buoy or the like, but the buoyancy body 30 does not have to have a function as a mark that the buoy has. Further, in the example shown in FIG. 2, the buoyancy body 30 is a sphere, but the shape of the buoyancy body 30 is not limited to a sphere, and may be a rectangular parallelepiped or the like.

The observation related device 40 is a device related to observation of the underwater environment. In this specification, the case where the observation-related device 40 includes a recording device that records the detection data detected in water by the acoustic sensor is mainly described, but the observation-related device 40 may include any device. For example, the observation related device 40 may include an acoustic sensor instead of the recording device or in addition to the recording device.

The cable 50-1 is connected to the observation related device 40, and the cable 50-2 connects the buoyant body 30 and the observation related device 40. Note that the thickness and length of each of the cable 50-1 and the cable 50-2 are not particularly limited. For example, the length of the cable 50-2 may be appropriately adjusted according to the distance from the water surface to the observation point. Moreover, the total length of the cable 50-1 and the cable 50-2 may be appropriately adjusted according to the distance from the water surface to the water bottom.

The weight member 60 receives a predetermined gravity right below. More specifically, the weight member 60 receives gravity larger than buoyancy in water. For example, the weight member 60 may be a metal member. However, the material of the weight member 60 is not particularly limited as long as it is a material that receives gravity larger than buoyancy in water.

The disconnecting portion 20 connects the weight member 60 and the cable 50-1. Further, the disconnecting section 20 is configured to be able to disconnect the weight member 60 and the cable 50-1. For example, the disconnecting section 20 can disconnect the weight member 60 and the cable 50-1 when a predetermined signal is detected. In this specification, the case where the predetermined signal is a sound wave signal is mainly assumed, but the type of the predetermined signal is not particularly limited.

The flow receiving portion 10A has a flow receiving surface 16 (16A) that receives a water flow when floating in water. And the flow receiving part 10A can exist in the position opened by a predetermined angle with respect to the cable 50-1. In addition, the flow receiving unit 10A rotates in the closing direction with respect to the cable 50-1 and rotates in the opening direction with respect to the cable 50-1. The configuration of the flow receiving unit 10A will be described in more detail with reference to FIGS. 3A and 3B.

FIG. 3A is a diagram showing an example of a state in which the flow receiving unit 10A is rotated in the opening direction with respect to the cable 50-1. As shown in FIG. 3A, one end of the flow receiving portion 10A is fixed to the connecting member 14, and the fixing position with the connecting member 14 is used as a reference with respect to the cable 50-1 (or the connecting member 14). It can rotate in the opening direction. At this time, the water bottom mooring structure 1 has a stop member 12 (12A) that stops the flow receiving portion 10A so as not to open the cable 50-1 (or the connection member 14) beyond a predetermined angle. The shape, size, position, etc. of the stop member 12A are not particularly limited.

In the example shown in FIG. 3A, the predetermined angle is an acute angle. An acute angle means an angle greater than 0 degrees and less than 90 degrees. The shape of the flow receiving surface 16A is not particularly limited. For example, as shown in FIG. 3A, the flow receiving surface 16A may have a flat surface. Further, as shown in FIG. 3A, the flow receiving surface 16A may have a rectangular shape.

In the example shown in FIG. 3A, both ends of the connecting member 14 are connected to the cable 50-1 by shackles, so that the flow receiving portion 10A is indirectly connected to the cable 50-1. However, how the flow receiving unit 10A is connected to the cable 50-1 is not limited. For example, both ends of the connection member 14 may be indirectly connected to the cable 50-1 by members other than the shackle. Alternatively, the flow receiving portion 10A may be directly attached to the cable 50-1 without using the connecting member 14.

FIG. 3B is a diagram showing an example of a state in which the flow receiving unit 10A is rotated in the closing direction with respect to the cable 50-1 (or the connection member 14). As shown in FIG. 3B, the flow receiving portion 10A can rotate in the closing direction with respect to the cable 50-1 (or the connecting member 14) with the fixed position with the connecting member 14 as a reference. Referring to FIG. 3B, a state where the flow receiving portion 10A is completely closed with respect to the cable 50-1 (or the connecting member 14) is shown.

In the following description, a state in which the flow receiving portion 10A is opened at a predetermined angle with respect to the cable 50-1 (or the connecting member 14) may be referred to as an "open state". On the other hand, the state in which the flow receiving unit 10A is completely closed with respect to the cable 50-1 (or the connection member 14) may be particularly referred to as a "closed state".

The configuration of the bottom mooring structure 1 according to the present embodiment has been described above.

(1-2. Description of operation)
Then, operation|movement of the water bottom mooring structure 1 which concerns on this embodiment is demonstrated. 4A to 4D are views for explaining the operation of the water bottom mooring structure 1 according to the present embodiment during subsidence in water. As shown in FIG. 4A, for example, the underwater mooring structure 1 is carried by the ship 80 or the like to the water surface in a direction almost directly above the observation point. Before the submerged mooring structure 1 is put into water, the flow receiving portion 10A is in an open state as shown in FIG. 4A.

When the water bottom mooring structure 1 is put into water, the flow receiving portion 10A receives a water flow in an upward direction, and thus transitions from the open state to the closed state (to the cable 50-1), as shown in FIG. 4B. Rotate in the opposite direction). As a result, the flow receiving unit 10A is less likely to receive a horizontal force in water, and thus is less likely to flow in the horizontal direction, and the observation point can be more accurately reached.

When the weight member 60 and the cable 50-1 are connected, the gravitational force that the water bottom mooring structure 1 receives is larger than the buoyancy force that the water bottom mooring structure 1 receives. Therefore, as shown in FIG. 4C, the water bottom mooring structure 1 sinks in water after being put into water. At this time, as shown in FIG. 4C, the flow receiving portion 10A continues to receive the water flow in the upward direction, and thus the closed state is continued. Over time, as shown in FIG. 4D, the bottom mooring structure 1 reaches the bottom and is moored to the bottom.

When the bottom mooring structure 1 reaches the bottom of the water, the flow receiving portion 10A does not receive the water flow in the directly upward direction, so that the state changes from the closed state to the open state, as shown in FIG. In this state, the underwater environment is observed.

5A to 5E are views for explaining the operation of the underwater mooring structure 1 according to the present embodiment when floating in water. As shown in FIG. 5A, the underwater environment is observed while the flow receiving unit 10A continues to be in the open state. When the observation of the underwater environment is completed, a predetermined signal is transmitted underwater. For example, the predetermined signal is transmitted from a transmitter provided at the bottom of the ship 80 (FIG. 4A) triggered by a user operation. When the separation unit 20 detects a predetermined signal, the separation unit 20 separates the weight member 60 and the cable 50-1. The weight member 60 is left behind on the bottom of the water.

When the weight member 60 and the cable 50-1 are separated, as shown in FIG. 5B, the water bottom mooring structure 1 excluding the weight member 60 has a larger buoyancy than gravity, so that it floats in water. Go At this time, as shown in FIG. 5B, the flow receiving portion 10A receives the water flow in a straight downward direction, but since the flow receiving portion 10A exists at a position opened with respect to the cable 50-1, it is not only in the straight downward direction but also horizontal. You will receive directional force. Therefore, the flow receiving portion 10A floats and is also flowed in the horizontal direction.

When the flow receiving unit 10A is flown in the horizontal direction, the cable 50-1 pulled by the flow receiving unit 10A pulls the observation-related device 40 and the cable 50-2 in the horizontal direction. Therefore, as shown in FIG. 5C, the observation-related equipment 40 and the cable 50-2 also float and flow in the horizontal direction. Therefore, as described above, even if the levitation speed is different for each structure, it is possible to reduce the possibility that the plurality of structures forming the bottom mooring structure 90 interfere with each other.

When the bottom mooring structure 1 excluding the weight member 60 continues to float as described above, the buoyancy body 30 eventually reaches the water surface. However, a plurality of components that make up the bottom mooring component 1 are flowed horizontally during floating. Therefore, as shown in FIG. 5D, it is difficult for the plurality of components forming the bottom mooring component 1 to interfere with each other. Further, even when all the water bottom mooring structures 1 except the weight member 60 reach the water surface, as shown in FIG. 5E, the plurality of components forming the water bottom mooring structure 1 are less likely to interfere with each other.

In this way, the possibility that the plurality of constituent members of the bottom mooring structure 1 interfere with each other is reduced, and thus the possibility that the constituent members are damaged is also reduced. In addition, the possibility that the plurality of components that form the bottom mooring structure 1 interfere with each other is reduced, and thus the cable 50-1 or the cable 50-2 may be entangled with other components. Is reduced. The bottom mooring structure 1 excluding the weight member 60 is collected by the user.

(1-3. Description of effects)
According to the embodiment of the present invention, the buoyant body 30 that receives a predetermined buoyancy in water, the observation-related equipment 40 related to the observation of the underwater environment, and the cable 50-2 connecting the buoyancy body 30 and the observation-related equipment 40. And a receiving part 10 having a receiving surface 16A that receives a water flow when floating in water, and a water bottom mooring structure 1 provided with the cutting part 20 that can separate the weight member 60 and the cable 50-1. To be done. The flow receiving unit 10 is present at a position opened by a predetermined angle with respect to the cable 50-1.

According to such a configuration, when the water is levitated, the flow receiving portion 10A receives a water flow in a direct downward direction, but since the flow receiving portion 10A exists in a position opened with respect to the cable 50-1, the flow receiving portion 10A is not limited to a direct downward direction. Instead, it receives horizontal force. Therefore, the flow receiving portion 10A floats and is also flowed in the horizontal direction. Therefore, the possibility that a plurality of components forming the bottom mooring component 1 interfere with each other is reduced.

Moreover, since the possibility that a plurality of components forming the underwater mooring structure 1 interfere with each other is reduced, the possibility that the components are damaged is also reduced. In addition, the possibility that the plurality of components that form the bottom mooring structure 1 interfere with each other is reduced, and thus the cable 50-1 or the cable 50-2 may be entangled with other components. Is reduced.

(1-4. Description of Modification)
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to these examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

For example, in the above, the example in which the flow receiving unit 10A is directly or indirectly attached to the cable 50-1 has been described. However, the flow receiving unit 10A may be directly or indirectly attached to another structure. That is, the flow receiving unit 10A may be directly or indirectly attached to any of the observation-related device 40, the cable 50-1, the cable 50-2, and the disconnecting unit 20.

However, since the cable 50-2 is often attached to an electronic device (for example, an acoustic sensor), it is often hard, while the cable 50-1 is rarely attached to an electronic device. Because of this it is often soft. It is considered that the hard cable 50-2 is prone to be tilted by a slight water flow, while the soft cable 50-1 is hard to be tilted by a water flow. Therefore, attaching the flow receiving portion 10A to the cable 50-1 that is difficult to tilt is easier for the flow receiving portion 10A to receive a horizontal force when floating in water, rather than attaching the flow receiving portion 10A to the cable 50-2 that is easy to tilt. It is considered to be more suitable because it is easy to flow in the horizontal direction.

In the above example, the case where the flow receiving surface 16A is a flat surface has been mainly described. However, the flow receiving surface 16A does not have to be a flat surface. FIG. 6A is a diagram showing an example of a state in which the flow receiving unit 10B according to the first modification is rotated in the opening direction with respect to the cable 50-1. FIG. 6B is a diagram showing an example of a state in which the flow receiving unit 10B according to the first modification is rotated in the closing direction with respect to the cable 50-1. As shown in FIGS. 6A and 6B, the flow receiving surface 16B may be a curved surface.

Further, as described above, the flow receiving portion 10A can be present at a position opened by a predetermined angle with respect to the cable 50-1 in the open state, but the predetermined angle is an acute angle as shown in FIG. 3A. Not limited to. FIG. 7A is a diagram showing an example of a state in which the flow receiving unit 10A according to the second modification is rotated in the opening direction with respect to the cable 50-1. Moreover, FIG. 7B is a diagram showing an example of a state in which the flow receiving unit 10A according to the second modification is rotated in the closing direction with respect to the cable 50-1.

As shown in FIGS. 7A and 7B, the predetermined angle at which the flow receiving unit 10A is opened with respect to the cable 50-1 in the open state may be an obtuse angle. Obtuse angle means an angle greater than 90 degrees and less than 180 degrees. Even in such a case, the flow receiving portion 10A receives a force in the horizontal direction by receiving the water flow in the downward direction when floating in the water. However, in comparison with the case where the predetermined angle is an acute angle, You will receive the opposite force.

The predetermined angle may be adjusted in any way. For example, as shown in FIGS. 7A and 7B, the predetermined angle may be adjusted by making the shape of the stop member 12B different from the shape of the stop member 12A (FIGS. 3A and 3B). Alternatively, the predetermined angle may be adjusted by making the position of the stop member 12B different from the position of the stop member 12A (FIGS. 3A and 3B).

Further, in the above-described example, the cable 50 is divided into the cable 50-1 and the cable 50-2, and the cable 50-1 connects the disconnection unit 20 and the observation-related device 40, and the cable 50-2. Has mainly described the case where the buoyant body 30 and the observation-related equipment 40 are connected. However, the cable 50 may be divided into three or more pieces, or may be combined into one piece. That is, the cable 50 may connect the disconnecting section 20, the observation-related equipment 40, and the buoyancy body 30.

1 Water bottom mooring structure 10 (10A, 10B) Flow receiving part 12 (12A, 12B) Stop member 14 Connection member 16 (16A, 16B) Flow receiving surface 20 Disconnection part 30 Buoyancy body 40 Observation related equipment 50 Cable 60 Weight member 80 Ship

Claims (7)

A buoyant body that receives a predetermined buoyancy in water,
Observation-related equipment related to observation of the underwater environment,
A first cable connected to the observation-related equipment,
A second cable connecting the buoyant body and the observation-related equipment;
A separating portion capable of separating the weight member installed on the water bottom from the first cable,
A receiving part having a receiving surface that receives a water flow when floating in water,
The flow receiving portion is present at a position opened by a predetermined angle with respect to the first cable, and when receiving a water flow during settling in water, the flow receiving portion rotates in a closing direction with respect to the first cable,
Submarine mooring structure. A buoyant body that receives a predetermined buoyancy in water,
Observation-related equipment related to observation of the underwater environment,
A first cable connected to the observation-related equipment,
A second cable connecting the buoyant body and the observation-related equipment;
A separating portion capable of separating the weight member installed on the water bottom from the first cable,
A receiving part having a receiving surface that receives a water flow when floating in water,
The flow receiving portion is present at a position opened by a predetermined angle with respect to the first cable, and when the flow receiving surface receives a water flow during floating in water, the flow receiving portion moves in a direction of opening with respect to the first cable. Rotate,
Submarine mooring structure. The water bottom mooring structure has a stop member for stopping the flow receiving part so as not to open beyond the predetermined angle with respect to the first cable.
Sea bed anchoring construction according to claim 1 or 2. The flow receiving unit is directly or indirectly attached to any one of the observation related device, the first cable, the second cable, and the disconnecting unit,
Sea bed anchoring construction according to claim 1 or 2. The flow receiving surface has a flat surface or a curved surface,
Sea bed anchoring construction according to claim 1 or 2. The predetermined angle is an acute angle or an obtuse angle,
Sea bed anchoring construction according to claim 1 or 2. The disconnecting part disconnects the weight member and the first cable when a predetermined signal is detected,
Sea bed anchoring construction according to claim 1 or 2.

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