JP2713390B2 - Ship equipped with net cleaning device and net cleaning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ship equipped with a net cleaning device and a method for cleaning a net, and more particularly to a method for efficiently removing adhering substances from a net at sea without using an antifouling agent such as an organotin compound. It is to be removed.

[0002]

2. Description of the Related Art The present inventor has proposed a method of preventing marine organisms from adhering to a fish net by applying a paint containing a harmful organic tin compound, particularly, an antifouling agent such as a tributyltin compound or a triphenyltin compound. In order to restore the mesh of the fishnet to its original state by efficiently washing the fishnet instead of the above, a technique "cleaning apparatus for large fishnet" disclosed in Japanese Utility Model Laid-Open No. 5-21657 was proposed and good results were obtained. ing.

[0003]

Since such a large fishnet cleaning apparatus is suitable for onshore cleaning,
It is necessary to anticipate the labor required to collect large fish nets, such as fixed nets, on land at a cycle of, for example, one or two months, and to install them again in the sea after washing. If a large fishnet cleaning device is mounted on the deck of a ship, the fishnet can be cleaned on the deck, but part of the deck is occupied by the body, drive source, large-capacity pump, operation panel, etc. As a result, various operations on the deck are affected, and the labor for transporting the large fish net cleaning device between land and sea is increased. If the work such as washing by washing is not taken into account, the efficiency is reduced. Therefore, there is a problem that other offshore work is sacrificed only during that time.

The present invention has been made in view of such circumstances. (1) A large fish net or the like in which application of a paint containing an antifouling agent such as an organotin compound has been stopped is efficiently cleaned at the installation site. And restore it to its original state. (2) To be able to easily perform net cleaning work at any time, such as between fishing operations. (3) In the case of fixed nets, etc., the nets shall be restored without leaving the nets on the land, and semi-permanent use will be possible. (4) Efficiently wash the net using the tide and wind direction to restore the net and prevent the deck and the like from being stained by the detached deposits. (5) Return the marine life attached to the net to the sea as it is,
Reduce the impact on the ecological environment and prevent the destruction of the environment due to drying and spoilage of marine life. (6) A simple operation such as activation of a drive source can promptly start a washing operation by suction and ejection of seawater. And so on.

[0005]

In order to achieve the above object, a plurality of means have been proposed. The first means relates to a ship equipped with a net cleaning device, and includes a drive source and a large capacity pump mounted on a support base inside the hull , and a water suction connected to a suction port of the large capacity pump for sucking seawater. Means, and the high-capacity pump at the outlet at a high elevation in front of the hull.
A transfer pipe laid in a state where they are connected to a front support structure to transfer high-pressure water, and a portion to be washed connected to the end of the transfer pipe and exposing the wash water to the atmosphere.
An ejection nozzle for ejecting adhering matter toward the net, and an ejection nozzle disposed in a state interposed between the ejection nozzle and the front support structure of the hull, and having the ejection nozzle positioned above the deck in each direction. a swing supporting device for swingably supported, are mounted on the hull stretched shape to be cleaned network to a position above the deck
Lifting the state adopts a configuration comprising a winch or on-board crane. The second means is provided before the first means.
In place of the ship's wheelhouse instead of the head support structure
The upper support structure in
These between the pump outlet and the upper support structure.
A transfer pipe for transferring high-pressure water is installed in the
In each direction at a position above the steering room
Configuration supported by the upper support structure so that it can swing
I use it. The third means is a water-absorbing plenum portion, in addition to the first means and the second means, wherein a water-absorbing means (50) is arranged at a lower part of the body so as to be isolated from the inside of the hull and connected to a large-capacity pump. And a water intake port arranged in the water absorption plenum portion and communicated with the outside of the boat near the bottom of the boat. The fourth means is, in addition to the third means, provided with a separator plate having a water inlet integrally formed with an outward opening of the water-absorbing plenum portion, and a plurality of small holes formed in the separator plate. The configuration is adopted. The fifth means relates to a method of cleaning a net using a ship. The net to be cleaned is lifted above the sea surface in the vicinity of the installation location of the net to be cleaned, and the net to be cleaned is exposed to the atmosphere. The high-pressure water is jetted to separate the deposits on the net to be cleaned, and the separated deposits are removed together with the water flow to the space behind the fish net to be cleaned, and the high-pressure water is removed from the portion exposed to the atmosphere. After changing the discharge position of the cleaning net and cleaning the exposed portion of the net to be cleaned, move the hull along the installation direction of the net to be cleaned and return the washed portion of the net to be cleaned to the sea. A continuous configuration is adopted. The sixth means is, in addition to the fifth means, lifted at a plurality of locations of the net to be cleaned by spaced hanging points near the installation location of the net to be cleaned, and is supported in a crosslinked state. A configuration is adopted in which high pressure water is jetted to the portion and the portion supported in a hanging state to wash the net to be cleaned.

[0006]

According to the first means, when a ship is navigated to a place where a net is installed offshore or the like and a large-capacity pump is operated by activating a drive source, seawater sucked from the water absorbing means is converted into high-pressure water. Then, it is transferred to the separated position on the ship by the transfer pipe and jetted from the jet nozzle. By setting the direction of the jet nozzle to the desired direction with the swing support device, when high-pressure water is jetted to the net to be cleaned, the energy of the high-pressure water causes the attached matter such as marine organisms to be separated from the mesh, and the jet flows together with the water flow. Removed. At this time, the ejection nozzle is supported by the swing support device in a state in which swing movement in each direction is possible and without causing movement due to ejection half force. In the second means, in addition to the action based on the first means, the swing support device is set at a high position of the hull, so that the high pressure water jetting range becomes large, and the high pressure water is moved downward. When spouted toward it, the detached deposits are less likely to soar into the air, and are immediately returned to the sea with the water current. In the third means, in addition to the action based on the first means or the second means, seawater is directly introduced into the water-absorbing plenum from the water inlet at the bottom of the ship and is sent to the large-capacity pump. At this time, the water-absorbing plenum is kept in a state of being isolated from the inside of the ship. According to the fourth means, in addition to the action based on the third means, the occurrence of the phenomenon that the floating substance in the sea enters the water-absorbing plenum together with the seawater by the separator is suppressed, and the seawater is formed by the small holes. It is introduced into the water-absorbing plenum from the point in parallel. According to the fifth means, the net is drained by jetting high-pressure water to the exposed portion of the net, and the net is washed while checking the condition before and after the net is washed. Is shifted by the movement of the ship, and the net is continuously washed in the target direction. According to the sixth means, in addition to the action based on the fifth means, a wide area is washed while the net is bridged and spread, and the washing thickness of the net is reduced so that the high-pressure water is removed. The generation of uneven cleaning power due to the water flow is suppressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a ship equipped with a net cleaning device and a net cleaning method according to the present invention will be described below with reference to FIGS.

The embodiment shown in FIGS. 1 to 4 is an improvement of the above-mentioned prior art, that is, a technique for cleaning a large fish net, disclosed in Japanese Utility Model Laid-Open No. 21657/1993. The following technologies have been organically added to mount the device on a ship.

In these figures, the symbol X is a net to be washed (fish net to be washed), 2 is a drive source, 3 is a large capacity pump, 4 is a water absorption pipe (water absorption hose), 5 is a transfer pipe (transfer hose), 6 Is a jet nozzle, 7 is a stand base, 15 is a water absorption pipe, 40 is a hull, 40a is a ship bottom, 41 is a deck, 42 is a front support structure (support structure), 43 is a steering room, and 44 is an upper support structure. , 45 is a mast, 46 is a winch, 47 is a shipboard crane, 48 is an engine room, 49 is a support base, 50 is a water absorbing means, 51 is a water absorbing plenum portion, 52 is a water absorbing port, 53
Is a partition for water absorption, 54 is a separator, and S is a swing support device. In addition, the same reference numerals are given to the portions that overlap with the “large fish net cleaning device” described in Japanese Utility Model Laid-Open No. 5-21657, and a part of the description is omitted. The details will be described below.

The net X to be washed is a fixed net, a fish net, or the like, which is a large fish net, and those installed offshore or the like are to be washed.

The drive source 2 is supported by a support base 49 in an engine room 48, for example.
A high output and durable one is applied, such as a marine diesel engine or the like, which has high durability with respect to seawater and a high output with a rated output of 60 to 140 hp and a high rotation speed, for example, directly connected to a large capacity pump 3. In such a case, it is preferable that the motor satisfies the high output and high rotation characteristics of about 3150 to 3800 rotations / minute. The support base 49
May be a ceiling wall or the like of the partition wall 53 for water absorption.

As the large-capacity pump 3, a pump that satisfies high pressure characteristics with a large amount of water is applied.
Those having a discharge capacity of about 1000 to 2400 liters / minute at a rate of about 1000 / cm ² are suitable. In order to satisfy such specifications, application of a high-pressure large-capacity pump for firefighting or the like is considered. In addition, even in the large capacity pump 3, the engine room 4
8 is supported by a support base 49 inside and is directly connected to the rotation shaft of the drive source 2.

The water absorption pipe (water absorption hose) 4, the transfer pipe 5 (transfer hose), the jet nozzle 6, and the water absorption pipe 15
In consideration of handling a relatively high pressure and being mounted on the hull 40, a metal pipe having excellent corrosion resistance is applied. In the water absorption pipe 4, the water absorption pipe 15 is arranged to connect to the water absorption plenum 51, and the transfer pipe 5
Is connected to the discharge port of the large capacity pump 3 and, for example, as shown in FIG.
Are laid along the lower side or up from the deck 41 to the positions of the front support structure (support structure) 42 and the upper support structure 44 (support structure) . In addition, in the part of the water absorption pipe 4 and the transfer pipe 5, it is also possible to apply or use a reinforced synthetic resin hose in consideration of pressure resistance.

As shown in FIG. 4, the swing support device S is a general term for a portion constituted by a vertical tube portion 8 and a swing tube portion 9. In the example of FIG. It is attached to the base 7 and supports the ejection nozzle 6 so that it can rotate vertically and horizontally.

In the stand 7, an upper support structure above the front support structure (support structure) 42 and the steering room 43 in accordance with the number of swing support devices S and the number of jet nozzles 6 installed. It is arranged integrally on the object 44 by welding or bolting.

The hull (boat) 40 is a fishing boat or the like suitable for fishing work, and includes a front support structure 42 set at a position higher than a deck 41, a steering room 43, and an upper part of the steering room 43. , A winch 46 installed on a mast 45, a ship crane 47 installed as a part of a power machine, a support base 49 inside an engine room 48, and water absorbing means. 50.

The water absorbing means 50 is connected to the suction port of the large capacity pump 3 via the water absorbing pipe 4 and the water absorbing pipe 15, and is disposed in the engine room 48 inside the hull 40 in a state separated from the inside of the hull. A portion 51 and a water inlet 52 for connecting the water-absorbing plenum portion 51 to the outside (in the sea outside the ship) at a position near the ship bottom 40a.

The water-absorbing plenum portion 51 is disposed in a state partitioned from the inside of the engine room 48, and is formed integrally with a hollow water-absorbing partition wall 53 having a rectangular shape and closing the outward opening 51a. It is formed by the separator 54. The water inlet 52 is formed by forming a number of small holes 54 a in the separator 54. In addition, corresponding to the case where the ship bottom 40a is formed of glass fiber reinforced plastic (FRP), the water absorbing partition wall 53 and the separator 54 are also formed of, for example, the same material.

In addition, a required number of partition walls 55 for partitioning the water absorption plenum portion 51 into a plurality of portions and intentionally decelerating and rectifying the flow of seawater sucked from the small holes 54a are provided inside the water absorption plenum portion 51, and a water absorption pipe. A strainer 56 in a connected state is disposed at the end of the fourth.

The partition wall 55 has a small hole 54 in the water inlet 52 depending on the number of the water suction pipe 4 and the strainer 56.
a and a bent portion of the flow are formed between the a and the strainer 56. When the small holes 54a are formed in the entire area of the separator 54 and the strainers 56 are arranged on both sides as shown in FIG. Is set to a position between the strainers 56,
Further, as shown in FIG. 3, when the small hole 54a is formed in a part of the separator 54 and the strainer 56 is arranged on the opposite side,
It is set so as to partition between them in a step shape.

A required number of on-off valves 57 for switching the flow path and opening / closing the passage corresponding to the number of branches by the opening / closing operation are arranged at the connection point with the water absorption pipe 4 and the middle and branch points of the water absorption pipe 15. Is done.

The water-absorbing partition 5 above the water-absorbing plenum 51
In the ceiling part of 3, an air bleeding port 58 is provided.
The air discharged from the air vent pipe 59 and the seawater mixed with air are discharged from the side of the hull 40 as appropriate.

In a ship equipped with a net cleaning device configured as described above, if the ship (hull 40) is navigated to an installation location of the net X to be cleaned, such as offshore, the net cleaning device is simultaneously moved to a required work place. It has been transported.

Hereinafter, the net cleaning operation (method) will be described. The winch 46 and on-board crane 47 is operated, when lifting the example 2 places of the cleaning network X to above the sea surface WL, as shown in FIG. 1, the cleaned network X is, the hanging point P _1, P ₂ It is spread in a cross-linked state, exposed to the atmosphere, and drained.

If necessary, the swing support device S and the jet nozzle 6 are installed on the front support structure 42 to open and close the on-off valve 57.
With the ejection nozzle 6 facing the net X to be cleaned,
When the large capacity pump 3 is operated by starting the drive source 2,
Seawater is sucked in from the water suction port 52 located below the sea surface WL via the water absorption plenum 51 and is discharged from the large capacity pump 3 to become high pressure water,
The high-pressure water is transported by the transport pipe 5 to the jet nozzle 6 installed at a desired position on the ship and separated from the ship, and high-pressure water is jetted toward the net X to be cleaned.

When high-pressure water is jetted from the jet nozzle 6 to the net X to be cleaned in the spread state, the deposits of marine organisms and the like are separated from the net by the energy of the high-pressure water and pass through the net together with the water flow. Sea surface W while drawing a parabola
It is returned to L. In the example of FIG. 1, the swing support device S and the jet nozzle 6 can be installed for the two support structures 42 and 44, so that the high-pressure water is jetted from two directions to clean the net X to be washed. Can be washed.

When the jet nozzle 6 is supported by the swing support device S, a reaction force is generated when the high-pressure water is jetted.
The high-pressure water can be ejected in a desired direction by operating the operation lever 30 without the positional fluctuation of the ejection nozzle 6 being received by the ejection nozzles 2 and 44. In this case, in the high-pressure water in this case, the state of water flow such as jet water, an annular shape, and shower water is appropriately switched based on the state of attachment of marine organisms to the mesh of the net X to be cleaned by operating the water flow adjustment lever 31. .

When changing the washing location of the net X to be washed,
If the net X to be washed is a large fish net like a fixed net, it is more reasonable to move the ship (hull 40). In other words, washing of the net X to be washed is repeated by slightly moving the ship and shifting the position of suspension by the winch 46 and the crane 47 on the ship.

When the washing operation is performed, if the hull 40 is affected by the tidal current, the hull 40 is stopped by, for example, applying a propulsive force of the ship in the direction opposite to the tidal current, or the hull 40 is stopped by an anchor. The hull 40 is positioned upstream of the tidal current while securing the position of the hull 40 by a fixing method or the like, so that the separation distance between the hull 40 and the net X to be washed is maintained and interference is prevented. And even in the case of being affected by the wind, the hull 40 is arranged upstream (upwind) and the jet of the high-pressure water is directed to the leeward, so that the distance to the net X to be cleaned is secured and the cleaning is performed. The occurrence of the phenomenon in which the detached adhered substance returns to the hull 40 without the worker being sprayed with seawater is suppressed.

As described in Japanese Utility Model Laid-Open No. 5-21657, the washing water of the net by the high-pressure water needs to satisfy the conditions of high water volume and high pressure. According to the subsequent experimental results, in the above-described combination example of the driving source 2 and the large-capacity pump 3, the diameter of the ejection nozzle 6 was 20 to 26.
mm and two (or one) ejection nozzles 6, it was confirmed that in addition to seaweeds and seaweeds, attached marine organisms such as barnacles, mussels, and hydroins could be quickly and reliably removed. Was. The state of the net X to be washed after the washing was such that the attached marine organisms were completely removed from the surface of the yarn of the net, and the state of the net was restored to a new state.

[0031] Since all the marine organisms separated from the net X to be washed are returned to the sea in a living state, the influence on the ecological environment can be reduced.

In the ship equipped with the net cleaning device shown in FIG. 1, the water suction port 52 is provided on the bottom 40a except that the swing support device S for the front support structure 42 is not installed. , The drive source 2, the large-capacity pump 3, the water absorption pipe 4, the transfer pipe 5, the ejection nozzle 6, and the like are all set in advance, and the opening / closing valve 57 at a necessary portion is substantially opened, and the drive source By simple operation such as pushing the start button of 2,
High pressure water can be ejected.

When the seawater is sucked by the water absorbing means 50, the seawater is taken into the water absorbing plenum 51 through the small holes 54a of the separator 54, so that the floating substances in the sea together with the seawater are absorbed in the water absorbing plenum 51. Since seawater is introduced in a parallel state by a large number of small holes 54a, even if several small holes 54a are clogged, the water absorption is hardly affected. . The seawater introduced into the water-absorbing plenum 51 from the small holes 54a is
After the water flow is decelerated based on the large volume of the water-absorbing plenum portion 51, the strainer 5 on both sides in FIG.
6 is used, the seawater flows as shown by the solid arrow, and when one strainer 56 is used,
Seawater flows as shown by the dashed arrow, and in FIG.
Seawater flows in a meandering state, as indicated by the dashed arrows, and is sucked through the strainers 56, respectively.

As described above, the hull 40 is disposed in the vicinity of the net X to be washed, and seawater can be absorbed and high-pressure water can be ejected by a simple operation of operating the drive source 2 and the large-capacity pump 3. Then, the cleaning operation of the net X to be cleaned can be performed between the original fishing operations with a small amount of labor.

[Other Embodiments] In the present invention, the following technology can be adopted instead of the embodiment. a) The net to be cleaned X conceptually includes a fish net such as a fixed net, a culture net such as a shellfish and laver, a squid and other marine installations. b) To be applied to the cleaning work of in-water surface installations. c) An operation panel or a remote control device for starting and stopping the drive source is provided in the deck 41, the steering room 43, the engine room 48, and the like. d) The separator 54 at the water inlet 52 has a structure that can be disassembled and replaced. Further, the water-absorbing plenum portion 51 has a structure that can be opened by an upper lid or the like.

The ship equipped with the net cleaning device and the net cleaning method according to the present invention have the following excellent effects. (1) Since the hull is equipped with a drive source, a large-capacity pump, water absorption means, a transfer pipe, a swing support device, and a jet nozzle, the ship is navigated to the vicinity of the installation location of the net to drive the drive source and the large-capacity pump. When activated, high-pressure water is quickly and easily ejected to efficiently recover large fishnets, etc., for which application of paints containing antifouling agents such as organotin compounds has been stopped, to their original state, and to be used semipermanently. be able to. (2) In addition to the net cleaning device being built into the hull and the freedom of navigation of the ship, it is easy to clean the net for the required time at any time, such as during fishing. And simplification of the cleaning after that. (3) By moving the washing position while moving the ship near the place where the net is installed, it is possible to remove extraneous matter while the net is installed and restore the net, and reduce the labor for lifting the net on land. Can be omitted. (4) By arranging the swing support device on the upper support device, it is possible to increase a cleaning range by jetting high-pressure water, and to scatter jetted high-pressure water downward, thereby scattering a separated adhered substance. And the fouling of the hull can be reduced. (5) By arranging the ship upstream of the tidal current and wind to wash the net, the net can be efficiently washed using the tidal current and wind direction while checking the location of the net washing with high pressure water. And the workability can be improved by eliminating the influence of the backflow of the spray, such as contamination of the hull and the worker. (6) By returning the marine organisms attached to the net to the sea as it is, compared to on-land net cleaning work, it prevents environmental destruction due to drying and decay of marine organisms and reduces the impact on the ecological environment. can do. (7) The water absorption means includes a water absorption plenum at the bottom of the hull,
By having the water suction port communicated with the outboard, it is possible to quickly and surely absorb water without performing special preparation when the large capacity pump is operated. (8) The water intake port is provided with a separator and a number of small holes formed in the separator, thereby suppressing the occurrence of a phenomenon in which drifting substances in the sea enter the water absorption plenum and preventing accidents in the water absorption system. be able to. (9) The net can be lifted up to expose it to the atmosphere and blow high-pressure water to improve the washing efficiency, and the net can be moved without changing the net washing position by moving the hull. Cleaning can be performed continuously at the installation location. (10) By suspending the washing portion of the net and washing it in a cross-linked state, it is possible to easily remove the attached matter and to reduce the occurrence of unevenness in washing due to high-pressure water.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a ship equipped with a net cleaning device according to the present invention.

FIG. 2 is a front sectional view showing a structural example of a water absorbing unit in FIG.

FIG. 3 is a front sectional view showing another example of the structure of the water absorbing means in FIG. 1;

FIG. 4 is a side view showing an example of the swing support device in FIG.

[Explanation of symbols]

X Net to be washed (fish net to be washed X) S Swing support device WL Sea surface P1, P2 Hanging point 2 Drive source 3 Large capacity pump 4 Water absorption pipe (water absorption hose) 5 Transfer pipe (transfer hose) 6 Spout nozzle 7 Stand 8 Vertical pipe part 9 Swing pipe part 10 Horizontal rotary joint part 11 Vertical rotary joint part 13 Wire rope 15 Water absorption pipe 25 Elbow pipe part 26 Joint part 27 Flange 28 Horizontal rotation stop handle 29 Vertical rotation stop handle 30 Operation lever 31 Water flow adjustment lever 40 Hull 40a Ship bottom 41 Deck 42 Front support structure (Support structure) 43 Steering room 44 Upper support structure (Support structure) 45 Mast 46 Winch 47 Shipboard crane 48 Engine room 49 Support base 50 Water absorption plenum section 52 water suction port 53 partition wall for water absorption 54 separator 54a Small hole 55 Partition wall 56 Strainer 57 Open / close valve 58 Air vent 59 Air vent pipe

Claims (6)

(57) [Claims] 1. A drive source (2) and a large capacity pump (3) mounted on a support base (49) inside a hull (40) , and connected to a suction port of the large capacity pump to suck seawater. A water absorbing means (50) and a front support structure (4) at a position at a high position in front of the hull with the discharge port of the large capacity pump;
2) a transfer pipe (5) laid in a state where these are connected to each other to transfer high-pressure water, and a cleaning net connected to the end of the transfer pipe and exposing the wash water to the atmosphere.
(X) a jet nozzle (6) for separating adhering matter from the jet nozzle, and a jet nozzle disposed between the jet nozzle and the front support structure of the hull and having the jet nozzle higher than the deck (41). swing supporting device for swingably supported at a position above each direction (S) and, lifting the article to be cleaned network mounted on the hull in the tensioned state to a position above than the deck winch (46) or on-board crane (47) A ship equipped with a net cleaning device, comprising: 2. A support base inside a hull (40).
Driving source (2) and large capacity pump mounted on (49)
(3) and connected to the suction port of the large capacity pump to suck seawater.
Water suction means (50) to draw, discharge port of large capacity pump and ship
Upper support structure at a position higher than the body's wheelhouse (43)
It is laid with these connected to the structure (44).
A transfer pipe (5) for transferring high-pressure water;
Wash the part that is connected to the tip and exposes the wash water to the atmosphere
Spouting nose that spouts adhering matter toward the clean net (X)
Between the jet nozzle and the upper support structure of the hull.
Between the wheelhouse and the ejection nozzle
Swing to support swinging in each direction at the other side
And the net to be cleaned mounted on the hull
(41) A wire that is suspended in a stretched state to a position above
(46) or on-board crane (47).
A ship equipped with a net cleaning device. 3. A water- absorbing plenum portion (51) which is disposed below the hull (40) and is separated from the inside of the hull and connected to the large-capacity pump (3). 3. A ship equipped with a net cleaning device according to claim 1, further comprising a water intake port (52) arranged and communicated with the outside of the ship near the ship bottom (40a). 4. A water intake port (52) having a water absorption plenum (5).
The separator (5) which is integrally disposed in the outward opening (51a) of (1).
4. A boat equipped with a net cleaning device according to claim 3, comprising: (4) a plurality of small holes (54a) drilled in the separator. 5. A washing target net is lifted above a sea surface (WL) in the vicinity of a place where the washing target net (X) is installed, and high-pressure water is jetted onto a part of the washing target net exposed to the atmosphere to be washed. Peel off the deposits on the net and remove the detached deposits.
Move with the water flow to the space behind the fish net to be washed and remove it,
The portion exposed to the atmosphere is washed while changing the discharge position of high-pressure water. After the exposed portion is washed, the hull (40) is moved along the installation direction of the washed net. Washing the net by returning the washed portion of the net to be washed to the sea. 6. In the vicinity of the installation location of the net to be cleaned (X), a plurality of locations of the net to be cleaned are connected to spaced-apart suspension points (P1, P2).
6. The net according to claim 5, wherein the net to be cleaned is washed by jetting high-pressure water onto a portion supported in a bridged state and a portion supported in a hanging state. Cleaning method.