JP2012231732A - Method for recovering middle-layer floating fish bank and recovering tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for recovering a middle-layer floating fish bank, superior in workability and reliability, in which a recovery rope can be easily and surely attached to an underwater mooring cable without requiring a complex operation and the middle-layer floating fish bank can be recovered in a short time.SOLUTION: The method for recovering the middle-layer floating fish bank includes: a locking part holding process to which a locking part formed in a larger ring shape than an outer shape of a fish bank body of the middle-layer floating fish bank is externally inserted above the fish bank body to hold in a connection position of the fish bank body and the mooring cable; a locking part-mounting process for reducing the diameter of the locking part and winding it on the circumference of the mooring cable; and a recovery process for pulling the locking part to pull up the fish bank body together with the mooring cable on the water.

Description

  The present invention relates to a method for collecting a middle-floor floating fish reef moored in water by a mooring line and a collecting tool used therefor.

In general, a floating fish reef has a structure in which a sinker sinking on a fish reef body and the bottom of the sea is connected by a mooring cable and moored to float in water.
This floating fish reef is recovered by attaching a recovery cable to the mooring line and rolling up the recovery cable with a winch equipped on a trolley after reaching the service life of about 10 years.
In the case of surface floating fish reefs that float the reef body above the water surface in the floating reef, divers can dive and attach the recovery rope, but in the case of middle-floating fish reefs that float the reef body below the water surface For example, there is a problem that it is necessary to attach the recovery cable to the connection position between the fish reef body and the mooring cable at a water depth of about 100 m, and it is difficult to attach the diver.
Therefore, (Patent Literature 1) states that “the recovery rope that is fed out from the work ship after moving the tip side of the guide rope suspended from the work ship and locking it at an appropriate position of the fish reef body to fix the work ship. Unmanned submersible with a detachable fitting attached to one end side is suspended near the reef body using a guide rope, and the unmanned submersible is operated under the reef body to operate the unmanned submersible. The middle-floating fish reef is characterized by separating the recovery metal fitting and the unmanned submersible after being coupled to the mooring line in the sea, lifting the unmanned submersible, and then rolling up the collecting rope on the work boat to lift the middle-floating fish reef. Is disclosed.

JP 2010-207106 A

  However, in the method of (Patent Document 1), it is necessary to operate the unmanned submersible to connect the recovery metal fitting to a mooring line below the fish reef body, which is difficult to operate. It takes time to connect to the position (the mooring line), and there is a problem of lack of operability and workability.

  The present invention solves the above-described problem, and can easily and reliably attach a recovery line to an underwater mooring line without performing a complicated operation, and can recover a middle-floating fish reef in a short time. A recovery tool with excellent workability and reliability in connection between the mooring line and the recovery line. The purpose is to provide.

In order to solve the above-mentioned problems, a method for recovering a middle-floor floating reef of the present invention and a recovery tool used therefor have the following configurations.
The method for recovering a middle-floating fish reef according to claim 1 of the present invention is a method for collecting a middle-floating fish reef moored in the water by a mooring line, and is formed in a ring shape larger than the outer shape of the fish reef body of the middle-floating fish reef. A locking part holding step for extrapolating the locked part from above the fish reef body and holding it at the connection position of the fish reef body and the mooring line, and reducing the diameter of the locking part to the outer periphery of the mooring line It has the structure provided with the latching | locking part mounting process to wind, and the collection | recovery process of pulling up the said latching part and pulling up the said fish reef main body on the water with the said mooring line.
This configuration has the following effects.
(1) An engaging portion holding step of extrapolating an engaging portion formed in an annular shape larger than the outer shape of the reef body of the middle-floating reef from the upper side of the reef body and holding it at the connection position between the fish reef body and the mooring line; The locking portion is predetermined by having a locking portion mounting step of reducing the diameter of the locking portion and winding it around the mooring line, and a recovery step of pulling the locking portion and lifting the reef body together with the mooring line to the water. Since it can be securely attached to the mooring line simply by reducing the diameter after being held at the position of, the middle floating fish reef can be recovered in a short time without performing complicated operations, Excellent certainty.
(2) In the locking portion holding step, since the locking portion formed in an annular shape larger than the outer shape of the fish reef body of the middle-floating fish reef is extrapolated from above the fish reef body, it is locked in advance according to the outer shape of the fish reef body. By adjusting the size of the section, it can be used for mid-floating floating reefs of various sizes and shapes, and is highly versatile.
(3) In the locking portion mounting step, the locking portion is reduced in diameter and wound around the mooring line, so that the locking portion can be securely mounted on the mooring line, and the locking portion is pulled in the recovery step. In this case, the locking portion does not come off from the mooring line, and the locking portion is stable and reliable.

Here, the latching part should just be formed in the cyclic | annular shape which can be diameter-reduced freely. The locking part may be formed integrally with the tip of the recovery line for pulling the locking part, or a separately formed member is connected to the front end of the recovery line using a connecting member such as a ring or a hook. Also good. For example, when forming a locking part at the tip of the recovery line, an annular member such as a shackle having an insertion hole may be attached to one end of the recovery line, and the other end of the recovery line may be inserted into the insertion hole of the annular member. If the other end of the recovery line is pulled with a winch or the like, the diameter of the locking portion is automatically reduced and wound around the mooring line. By further pulling, the fish reef body can be pulled up with the mooring line to the water. .
In addition, although a wire, a rope, etc. are used suitably as a latching | locking part, a nylon sling can also be used. As the recovery cord, a wire or rope wound around a winch drum may be used as it is, or a wire or rope may be separately connected to the tip.

In the locking portion holding step, when the locking portion is extrapolated from above the fish reef body, it is preferable that the locking portion is attached to a frame body having shape retaining property to hold the shape. For example, if the locking portion is attached along the annular portion of the frame body, the locking portion can be easily extrapolated from above the fish reef body together with the frame body, and the workability is excellent. In the locking part holding process, it is necessary to hold the locking part at the connection position between the fish reef body and the mooring line. However, since the frame body has a certain amount of mass, it is suspended by a crane or the like mounted on the recovery ship. The latching portion can be lowered and held at a predetermined position (height). If necessary, a weight or the like may be attached to the frame.
The locking portion and the annular portion (frame body) are preferably fixed by a fixing member such as a thread or string that is easily cut. This is because, when the diameter of the locking portion is reduced in the locking portion mounting step, the fixing member is cut and can be removed from the annular portion (frame body).
In addition, in order to collect the middle floating fish reef, it is necessary to confirm the position of the middle floating fish reef in advance. Therefore, it is preferable to perform a position confirmation process for detecting the position and depth of the middle floating fish reef on a survey ship equipped with a GPS receiver, a water depth device, a sonar, etc. on the day before the collection operation.

The recovery tool according to claim 2 of the present invention is a recovery tool used in the method for recovering a middle-floating floating reef according to claim 1, and has a locking portion formed in an annular shape that can be reduced in diameter on one end side. A recovery line, a frame having an annular part to which the locking part of the recovery line is detachably attached, and a suspension part disposed on the frame for suspending the frame from the recovery ship, It has the composition provided.
This configuration has the following effects.
(1) A recovery cable having an annularly formed locking portion that can be reduced in diameter on one end side, a frame body having an annular portion to which the locking portion of the recovery cable is detachably attached, and a frame body Since it has a suspension part for hanging the frame from the recovery vessel, it can be easily suspended from the recovery vessel, and can be easily aligned with the middle-floating floating reef. The other end of the recovery line By simply pulling with a winch or the like mounted on a recovery ship, the engaging portion can be reduced in diameter and securely attached to the mooring line, and the workability and reliability of the connection between the mooring line and the recovery line are excellent.
(2) Since the frame has an annular portion to which the locking portion of the recovery cable is detachably attached, the shape of the locking portion can be held by the annular portion in a state where the frame is suspended. The locking portion can be extrapolated from above the main body, and can be reliably held at the connection position between the fish reef main body and the mooring line, and the workability is excellent.
(3) Since the locking portion of the recovery cable is detachably attached to the annular portion of the frame, a part of the locking portion is removed until the locking portion completely contracts and comes off the annular portion. The diameter can be reliably reduced while being held by the annular portion, and the operation stability and reliability are excellent.

Here, since the locking portion and the recovery cable are as described in the first aspect, the description is omitted.
Moreover, although the frame body was demonstrated also in Claim 1, what is necessary is just to have an annular part at least. Although the shape of the annular portion and the entire frame can be selected as appropriate, the annular portion is preferably formed in a circular shape or an elliptical shape. This is because it is easy to attach the locking portion, and it is excellent in mass productivity, and is excellent in shape stability and durability. In addition, you may form in square shape or polygonal shape. This is because it is easy to disassemble and assemble and has excellent transportability and storage.
The material of the frame can be selected as appropriate, but metals and synthetic resins are preferably used. Each part of the frame may be formed of a hollow pipe-shaped member or a solid bar-shaped member. When the frame is made of metal, a shape steel or a steel pipe may be used.
The suspension part only needs to be able to suspend the frame body on a crane or the like mounted on the recovery vessel, and may have only a connecting member formed in an annular shape or a hook shape, or a wire or rope may be connected to the connecting member. It may be done.

The invention according to claim 3 is the recovery tool according to claim 2, wherein the locking portion of the recovery cable is fixed along the annular portion of the frame body, and the locking portion is contracted. It has the structure provided with the latching | fixed part fixing member cut | disconnected at the time of a diameter.
With this configuration, in addition to the operation of the second aspect, the following operation is provided.
(1) The locking portion of the recovery cable is fixed along the annular portion of the frame body, and has a locking portion fixing member that is cut when the diameter of the locking portion is reduced. When the locking portion fixing member is gradually cut and the last locking portion fixing member is cut, the locking portion is separated from the annular portion (frame body), so that the locking portion is surely reduced in diameter. It is excellent in stability and certainty of operation.

Here, as described in claim 1, as the locking portion fixing member, a thread, a string, or the like that is easily cut is preferably used. In particular, by using a material that is less elastic than the locking portion or the annular portion of the frame, it is possible to reliably cut with a small force when the locking portion is reduced in diameter, and hinder the diameter reduction of the locking portion. In addition, there is no occurrence of deformation of the annular portion or breakage of the locking portion, and the reliability is excellent.
Specifically, ropes made of synthetic fibers such as polypropylene rope, Cremona rope (registered trademark), and twain rope are preferably used.

The invention according to claim 4 is the collection tool according to claim 2 or 3, wherein the suspension part is connected to a crane mounted on the collection ship, and the other end side of the collection line is the collection ship. It has the structure connected so that winding-up was possible to the winch mounted in.
With this configuration, in addition to the operation of the second or third aspect, the following operation is provided.
(1) The suspension part is connected to the crane mounted on the recovery ship, and the other end side of the recovery line is connected to the winch mounted on the recovery ship so that it can be wound up, so that the frame body is connected to the crane via the suspension part. The locking part can be held at a predetermined position in a state where the locking part is suspended, and by pulling the recovery cable from the other end side with a winch, the diameter of the locking part is reduced, and the locking cable is securely wound around the mooring cable. Wearable, easy to operate, excellent in operational stability, certainty and reliability of locking.

A fifth aspect of the present invention is the collection tool according to any one of the second to fourth aspects, comprising a camera disposed on the frame.
With this configuration, in addition to the operation of any one of claims 2 to 4, the following operation is provided.
(1) By providing a camera disposed on the frame, the locking portion is placed at a predetermined position while confirming the positional relationship between the frame and the locking portion and the reef body and mooring line of the middle-floating reef fish reef. It is easy to work remotely and is excellent in labor saving and operability.

  Here, the number and arrangement of the cameras can be selected as appropriate, but it is preferable to arrange the cameras so that the central direction can be photographed from the peripheral edge of the frame. This is because it is easy to confirm the position of the mooring line by reliably extrapolating the frame body to the fish reef body. In particular, when a plurality of cameras are provided, the frame body can be prevented from buffering with the fish reef body, and the position of the mooring line can be reliably grasped, and the operability and positioning reliability are excellent.

According to invention of Claim 1, it has the following effects.
(1) A work that can be securely attached to a mooring line simply by reducing the diameter of a locking portion held in a predetermined position, does not require complicated operations, and can recover a middle-floating floating reef in a short time. It is possible to provide a method for recovering a middle-floor floating reef that is excellent in efficiency and certainty.

According to invention of Claim 2, it has the following effects.
(1) While being suspended from the recovery vessel, it can be easily aligned with the middle-floor floating reef, and the other end of the recovery line can be simply pulled by a winch mounted on the recovery vessel. It is possible to provide a collection tool that is excellent in workability and certainty in connection between a mooring line and a recovery line that can be securely attached to the mooring line by reducing the diameter.

According to invention of Claim 3, in addition to the effect of Claim 2, it has the following effects.
(1) Excellent stability and reliability of operation that can surely reduce the diameter of the locking part while gradually cutting the locking part fixing member while holding the locking part in a predetermined position. A collection tool can be provided.

According to invention of Claim 4, in addition to the effect of Claim 2 or 3, it has the following effects.
(1) The locking portion can be held at a predetermined position while being suspended from the crane via the hanging portion, and the locking portion is pulled by pulling the recovery cable from the other end side with a winch. It is easy to perform an operation that can be surely wound around the mooring line by reducing the diameter, and it is possible to provide a recovery tool that is excellent in operational stability, reliability, and reliability of locking of the engaging portion.

According to invention of Claim 5, in addition to the effect of any one of Claims 2 thru | or 4, it has the following effects.
(1) It is possible to perform remote operation while confirming the position of the fish reef body and mooring line of the middle-floating reef, and it is excellent in labor saving and operability that can be placed and held in a predetermined position. A collection tool can be provided.

The schematic side view which shows the position confirmation process of the collection method of middle-layer floating fish reef of Embodiment 1 The schematic side view which shows the latching | locking part holding | maintenance process of the collection method of the middle-floating floating reef of Embodiment 1 The schematic top view which shows the latching | locking part holding | maintenance process of the collection method of the middle-floating floating reef of Embodiment 1 The model perspective view which shows the collection | recovery tool used for the collection | recovery method of middle-layer floating fish reef of Embodiment 1 The schematic side view which shows the latching | locking part mounting | wearing process of the collection method of the middle-floating floating reef of Embodiment 1 The schematic side view which shows the collection | recovery process of the collection method of the middle-floating floating fish reef of Embodiment 1

(Embodiment 1)
A method for collecting a middle-floor floating fish reef and a collecting tool used therefor according to Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic side view showing a position confirmation step of the method for collecting a middle-floating floating reef of the first embodiment.
In FIG. 1, 1 is a middle-floating fish reef moored in water such as the sea 10, 1 a is a mooring line moored by connecting a fish reef body 1 b of the middle-floating fish reef 1 and a sinker (not shown) set on the seabed, Reference numeral 20 denotes a surveying ship equipped with a water depth device 21, a sonar 22, a GPS receiver 23, and the like and used in the position confirmation process of the middle-floating floating reef recovery method of the first embodiment.
In the first embodiment of the middle-floating floating reef collection method, first, as shown in FIG. 1, the depth checker 21, sonar 22, GPS reception mounted on the surveying ship 20 is performed by the position confirmation process on the day before the collection operation. Using the machine 23 or the like, the position and depth of the middle floating fish reef 1 are detected and recorded.

FIG. 2 is a schematic side view showing the locking portion holding step of the middle-floating fish reef recovery method of the first embodiment, and FIG. 3 shows the locking portion holding step of the middle-floating fish reef recovery method of the first embodiment. It is a schematic plan view.
2 and 3, 30 is a recovery ship used in the method for recovering the middle-floating floating reef of the first embodiment, 35 is a crane mounted on the recovery ship 30, 40 is a winch mounted on the recovery ship 30, and 45 is an implementation. It is a collection | recovery tool used for the collection | recovery method of the middle-floating floating fish reef of the form 1.

Here, the detail of the collection | recovery tool used for the collection method of the middle-layer floating fish reef of Embodiment 1 is demonstrated.
FIG. 4 is a schematic perspective view showing a recovery tool used in the method for recovering a middle-floating floating reef of the first embodiment.
In FIG. 4, reference numeral 50 denotes a collection line such as a wire or rope, 51 denotes an annularly formed locking portion on one end side of the collection line 50, and 52 denotes an attachment part 52 attached to one end of the collection line 50 and inserted into the insertion hole 52 a. An annular member using a shackle that is inserted through the other end and holds the locking portion 51 so that the diameter of the locking portion 51 can be reduced. 60 is a frame of the collection tool 45 formed of a synthetic resin or metal pipe or rod, 61 is An annular portion formed on the bottom of the frame body 60 to which the locking portion 51 is detachably attached, 62 is a plurality of column portions of the frame body 60 erected at the main points of the annular portion 61, and 63 is an annularly formed plurality. An annular coupling portion of the frame body 60 connecting the upper ends of the column portions 62, 63 a is a reinforcing portion disposed in a cross shape inside the annular coupling portion 63, and 64 is a collection tool 45 disposed in the annular coupling portion 63. The camera 65 has a locking portion 51 of the recovery cable 50 along the annular portion 61 of the frame 60. A locking part fixing member using a polypropylene rope to be fixed, 66 is a hanging part for connecting the annular connecting part 63 and the crane 35 to suspend the frame 60 from the recovery ship 30 (see FIGS. 2 and 3). It is.

Each process of the collection method of the middle-floor floating fish reef of Embodiment 1 performed using the collection tool comprised as mentioned above is demonstrated.
As shown in FIG. 2, in the locking portion holding step, the frame 60 of the collection tool 45 is lowered into the water using the crane 35, thereby forming an annular shape larger than the outer shape of the fish reef body 1 b of the middle-floating reef fish reef 1. The engaged locking portion 51 is extrapolated from above the fish reef body 1b and held at the connection position of the fish reef body 1b and the mooring line 1a.
At this time, the camera 64 can be operated while confirming the positional relationship between the frame 60 and the locking portion 51 (annular portion 61) and the fish reef body 1b and the mooring line 1a of the middle-floating fish reef 1. The number and arrangement of the cameras 64 can be selected as appropriate. However, by arranging the camera 64 so that the center direction (the central part of the annular part 61) can be photographed from the peripheral part of the frame body 60, Easy to check the position and excellent remote workability. In particular, by providing a plurality of cameras 64, the frame 60 can be prevented from buffering with the fish reef body 1b, and the position of the mooring line 1a can be surely grasped. Excellent.

FIG. 5 is a schematic side view showing a locking part mounting step of the method for collecting the middle-floating floating reef of the first embodiment.
In FIG. 5, by pulling the other end side of the recovery cable 50 with the winch 40, the recovery cable 50 passes through the insertion hole 52a of the annular member 52 and the locking portion 51 is narrowed (see FIG. 4). Then, it is wound around the outer periphery of the mooring line 1a.
At this time, the locking portion 51 is fixed by the locking portion fixing member 65 along the annular portion 61 of the frame 60, but as the locking portion fixing member 65, by using a polypropylene rope that is easily cut, When the locking portion 51 is reduced in diameter, the locking portion 51 is gradually cut from the locking portion fixing member 65 at a position far from the annular member 52, and when all the locking portion fixing members 65 are cut, the locking portion 51 is framed. Disconnected from 60. Thereafter, the frame 60 is lifted by the crane 35 above the fish reef body 1b and collected.
In addition, although the thing formed in the shape of a thread | yarn or a string is used suitably as the latching | locking part fixing member 65, the material can be selected suitably. In particular, by using a material made of a material having lower rigidity than the locking portion 51 and the annular portion 61 of the frame body 60, the locking portion 51 can be reliably cut with a small force when the diameter of the locking portion 51 is reduced. The diameter of the stop 51 is not hindered, the annular portion 61 is not deformed, the locking portion 51 is not damaged, and the reliability is excellent.

FIG. 6 is a schematic side view showing a recovery step of the method for recovering a middle-floating floating reef of the first embodiment.
In the locking portion mounting step of FIG. 5, after the locking portion 51 is wound around the outer periphery of the mooring line 1a, in the recovery step, the recovery line 50 is further pulled by the winch 40 to wind up, along with the mooring line 1a. The fish reef body 1b can be pulled up on the water (on board) and collected. Thereafter, the mooring line 1a is wound up by the winch 40, and the mooring line 1a and the sinker are collected.

As described above, according to the method for recovering a middle-floating fish reef in the first embodiment, the following actions are provided.
(1) An engaging portion holding step of extrapolating an engaging portion formed in an annular shape larger than the outer shape of the reef body of the middle-floating reef from the upper side of the reef body and holding it at the connection position between the fish reef body and the mooring line; The locking portion is predetermined by having a locking portion mounting step of reducing the diameter of the locking portion and winding it around the mooring line, and a recovery step of pulling the locking portion and lifting the reef body together with the mooring line to the water. Since it can be securely attached to the mooring line simply by reducing the diameter after being held at the position of, the middle floating fish reef can be recovered in a short time without performing complicated operations, Excellent certainty.
(2) In the locking portion holding step, since the locking portion formed in an annular shape larger than the outer shape of the fish reef body of the middle-floating fish reef is extrapolated from above the fish reef body, it is locked in advance according to the outer shape of the fish reef body. By adjusting the size of the section, it can be used for mid-floating floating reefs of various sizes and shapes, and is highly versatile.
(3) In the locking portion mounting step, the locking portion is reduced in diameter and wound around the mooring line, so that the locking portion can be securely mounted on the mooring line, and the locking portion is pulled in the recovery step. In this case, the locking portion does not come off from the mooring line, and the locking portion is stable and reliable.

As explained above, according to the recovery tool used in the method for recovering a middle-floating fish reef in the first embodiment, it has the following effects.
(1) A recovery cable having an annularly formed locking portion that can be reduced in diameter on one end side, a frame body having an annular portion to which the locking portion of the recovery cable is detachably attached, and a frame body Since it has a suspension part for hanging the frame from the recovery vessel, it can be easily suspended from the recovery vessel, and can be easily aligned with the middle-floating floating reef. The other end of the recovery line By simply pulling with a winch or the like mounted on a recovery ship, the engaging portion can be reduced in diameter and securely attached to the mooring line, and the workability and reliability of the connection between the mooring line and the recovery line are excellent.
(2) Since the frame has an annular portion to which the locking portion of the recovery cable is detachably attached, the shape of the locking portion can be held by the annular portion in a state where the frame is suspended. The locking portion can be extrapolated from above the main body, and can be reliably held at the connection position between the fish reef main body and the mooring line, and the workability is excellent.
(3) Since the locking portion of the recovery cable is detachably attached to the annular portion of the frame, a part of the locking portion is removed until the locking portion completely contracts and comes off the annular portion. The diameter can be reliably reduced while being held by the annular portion, and the operation stability and reliability are excellent.
(4) By fixing the locking portion of the recovery cable along the annular portion of the frame and having a locking portion fixing member that is cut when the locking portion is reduced in diameter, the locking portion is reduced in diameter. When the locking portion fixing member is gradually cut and the last locking portion fixing member is cut, the locking portion is separated from the annular portion (frame body), so that the locking portion is surely reduced in diameter. It is excellent in stability and certainty of operation.
(5) The suspension part is connected to the crane mounted on the recovery ship, and the other end side of the recovery line is connected to the winch mounted on the recovery ship so that it can be wound, so that the frame body is connected to the crane via the suspension part. The locking part can be held at a predetermined position in a state where the locking part is suspended, and by pulling the recovery cable from the other end side with a winch, the diameter of the locking part is reduced, and the locking cable is securely wound around the mooring cable. Wearable, easy to operate, excellent in operational stability, certainty and reliability of locking.
(6) By providing a camera disposed on the frame, the locking portion is placed at a predetermined position while checking the positional relationship between the frame and the locking portion and the reef body and mooring line of the middle-floating reef fish reef. It is easy to work remotely and is excellent in labor saving and operability.

  The present invention is a middle layer excellent in workability and reliability that can easily and reliably attach a recovery line to a mooring line in water without complicated operations, and can recover a middle floating fish reef in a short time. Offering a collection method of floating fish reef and easy operation, easy positioning, providing a recovery tool with excellent workability and reliability of connection between mooring and recovery rope, Can contribute to the efficiency of the collection work.

DESCRIPTION OF SYMBOLS 1 Middle-floating fish reef 1a Mooring line 1b Reef main body 10 Sea 20 Surveying vessel 21 Depth instrument 22 Sonar 23 GPS receiver 30 Recovery vessel 35 Crane 40 Winch 45 Recovery tool 50 Recovery rope 51 Locking part 52 Annular member 52a Insertion hole 60 Frame 61 Annular part 62 Column part 63 Annular connecting part 63a Reinforcing part 64 Camera 65 Locking part fixing member 66 Hanging part

Claims (5)

A method of collecting a middle-floor floating reef moored underwater by a mooring line,
A locking part holding step of extrapolating a locking part formed in an annular shape larger than the outer shape of the fish reef body of the middle-floating reef from the top of the fish reef body and holding it at the connection position of the fish reef body and the mooring line; A locking part mounting step of reducing the diameter of the locking part and winding it around an outer periphery of the mooring line; and a recovery process of pulling the locking part and pulling up the fish reef body together with the mooring line to the water. A method for recovering middle-floor floating reefs. A recovery tool for use in the method for recovering a middle-floating floating reef according to claim 1,
A recovery line having a locking portion formed in an annular shape that can be reduced in diameter on one end side, a frame body having an annular portion to which the locking portion of the recovery cable is detachably attached, and a frame body. And a suspension part for suspending the frame body from the recovery ship.   3. The locking portion fixing member that fixes the locking portion of the recovery cable along the annular portion of the frame and is cut when the diameter of the locking portion is reduced. The collection tool as described in.   The suspension part is connected to a crane mounted on the recovery ship, and the other end side of the recovery line is connected to a winch mounted on the recovery ship so as to be able to wind up. The collection tool described.   The collection tool according to any one of claims 2 to 4, further comprising a camera disposed on the frame.

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