JPS62198595A - Method of spreading bulk into sea and working ship therefor - Google Patents

Abstract

PURPOSE:To spread a bulk onto a sea bottom uniformly and efficiently, by moving a working ship in a direction perpendicular to a longitudinal direction of the ship, and dropping a bulk from a bottom opening having a length equal to that of a hold into the sea as a quantity of the bulk to be dropped is adjusted. CONSTITUTION:A hold 3 has a hopper structure such that both side walls 9 are tapered downwardly. The hole 3 is provided at its lower portion with a plurality of elongate spaces 10 divided longitudinally and connected to a bottom opening. A rotor 13 is located in each of the elongate spaces 10, and four sets of rotary feeder type discharging devices 12 are provided independently along the longitudinal direction. When a working ship is moved in a direction perpendicular to the longitudinal direction, the bottom opening having a length equal to that of the hold 3 follows such movement, and a bulk is dropped from the bottom opening over the width equal to the length of the hold 3. A quantity of the bulk to be dropped from the bottom opening is adjusted by the discharging device 12.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a method for distributing materials into the sea, which is useful in sand drain construction methods, etc., which are used in soft ground improvement work on the seabed, and a conventional work boat used therein. BACKGROUND OF THE INVENTION Conventionally, for various purposes, it has sometimes become necessary to spread materials such as earth and sand on the seabed.An example of this is the sand drain method used in soft ground improvement work on the seabed. Hereinafter, for convenience of explanation, the explanation will be based on this sand drain construction method.

Methods for distributing earth and sand onto the seabed in the sand drain method generally include a placement method, a conveyor method, and an earth-lifting boat method.

As for the methods of installation, there are methods such as open-bottomed soil transport vessels as shown in Figure 8 (a), side-beam type soil transport vessels, and gatsuto vessels as shown in Figure 8 (b). , open-bottom and side-barrel type soil transport vessels require less time for spreading, and the common advantage of these vessels is that they are economical because their hulls serve as both carriers and the amount of material to be spread. has.

In addition, as shown in Figure 8 (c), conveyor systems have multiple hoppers on the hull, and the earth and sand flowing out from these hoppers is guided by a conveyor to an overboard discharge port and then discharged into the sea. When using this method, the amount of soil to be spread can be adjusted by adjusting the amount of soil flowing out from the hopper.
It also has the advantage of being able to be sprayed continuously and approximately evenly.

Next, as a method belonging to the earth-lifting ship method, as shown in Fig. 8 (d), there is a method in which the earth and sand transported by the earth-carrying ship is lifted up using packets P, and then it is further spread by a conveyor Q. As shown in Figure 8 (E), there is a method of adding water to the earth and sand transported by an earth carrier and pumping it up with a pump R, which has the advantage of allowing continuous spreading. .

Problems to be Solved by the Invention By the way, when distributing earth and sand to the seabed using the sand drain construction method, in order to achieve rationality, it is necessary to make the amount of earth and sand spread as evenly as possible on the seabed and to make it as efficient as possible. It is required that the material be able to be widely distributed.

However, the above-mentioned conventional installation methods have disadvantages such as difficulty in uniformly distributing a quantitative amount, and similarly, the conveyor method and the earth-lifting boat method lack efficiency because the amount of material that can be spread at one time is small. Currently, there is no spreading method or device that satisfies both uniform and efficient spreading on the seabed.

SUMMARY OF THE INVENTION Therefore, the present invention aims to solve the above-mentioned problems, and provides a method for removing material into the sea that enables uniform and efficient spreading of material into the sea at the same time, and a work boat for use in the method. This is what I am trying to do.

Means for Solving the Problems The technical means of the present invention for achieving the above objects will be explained with reference to FIGS. 1, 2, and 3 corresponding to embodiments.

That is, the first invention, the method for distributing pellets into the sea, moves the work boat in a direction perpendicular to its longitudinal direction using the ship maneuvering winch 8a.
. . , 8b . . . , etc., while moving the material in the hold 3 along the longitudinal direction of the work boat.・・・
・A work boat used for scattering material into the sea, which is the second invention, has a structure that has approximately the same length as the hold section along the longitudinal direction of the work boat. A bottom opening 11 is provided. In addition, a discharge device 12 such as a rotary feeder is provided to drop the material in the cargo hold 3 into the sea from the bottom opening 11 in a manner that allows the amount of fall to be adjusted freely.

When the working vessel is moved in a direction perpendicular to its longitudinal direction,
The bottom opening 11, which is formed along the longitudinal direction of the work boat and has approximately the same length as the hold section 3, is also perpendicular to the moving direction of the work boat, and the scattering material is approximately the same as the hold section 3 of the work boat. It will fall from the bottom opening 11 with the width of the length. Further, as the work boat moves in a predetermined direction, the scattering material falls from the bottom opening 11 of the work boat, the amount of which is adjusted by the discharge device 12 . Therefore, the amount of falling material can be arbitrarily adjusted depending on the position of the work boat. However, if the material is heavy, such as earth and sand, the material discharged into the sea will inevitably reach the seabed, and the thickness of the material on the seabed can be adjusted freely, allowing it to be spread not only uniformly but also arbitrarily. It becomes possible to do so. In addition, if the removed material is light, it will not fall directly to the seabed, but depending on the purpose, scattering of such material can be effectively used.

Embodiments Hereinafter, specific embodiments of the present invention will be described in detail based on the drawings.

1 to 3 show a work boat according to the present invention, and 1 is a hull roughly divided into a shell section 2, a hold section 3, and a living quarters section 4,
On the upper deck 5 there are bollards 6 fixed along the side outer panels...
・Fairleader 7 fixed along the front and rear edges...
mooring devices such as . . . , four ship maneuvering winches 8 a for moving the hull 1 in the front-back direction, four winches 8 b for moving the hull 1 in the left-right direction, etc. are provided. The hold section 3 has a hopper structure in which both side walls 9.9 gradually narrow downward, and the upper edge thereof is extended upwards from the upper deck to increase the loading capacity of scattering materials. .

Further, the hold section 3 has an elongated hollow section 10 divided into a plurality of sections in the longitudinal direction at its lower part, and the lower end of the elongated hollow section 10... is as shown in FIG. The bottom opening 11 is connected to the bottom opening 11. A discharging device 12 for dropping the scattering material loaded in the cargo hold 3 into the sea along the elongated space 11.
The main parts of... are located.

In FIG. 4, this discharge device 12 is explained as follows: 13
are rotors located in each of the elongated hollow spaces 10, and each rotor 13 is connected in series by a rotation center shaft 15 supported by bearings 14, and this rotation center shaft 15 is In this embodiment, four sets of rotary feeder-type discharge devices 12 as described above are independently arranged in the front and rear directions, and are connected in conjunction with a hydraulic motor 16 that is variably rotated in forward and reverse directions by a hydraulic pump (not shown). It is arranged. To explain the rotor 13 in more detail with reference to FIG. 5 showing a cross-sectional view thereof, an outer cylinder 17 is fixed to the rotation center shaft 15 by a donut-shaped disc 18 . From there, vanes 19 having substantially the same length as the elongated hollow space 10 are radially fixed, and the tips of the vanes 19 rotate in close proximity to the arcuate inner surface of the scattering material guide 20. It is made to move. 21 is a blast material inlet formed by the upper component 20a of the blast material guide 20; 22 is the upper component 20 of the blast material guide 20;
This is the discharge port formed by □. This sprinkling material entrance 2
The material flowing in from the rotor 13 under its own weight is filled between the blades 19 on the upper part of the rotor 13, and the hydraulic motor 1
6 rotates around the rotation center axis 15, and the blade 1
9... and the material removal guide section 20, and are sequentially displaced toward the bottom opening 11, and when the material reaches the discharge port 22, it falls into the sea from the bottom opening 11. During this period, the following blades 19 are continuously connected to the hold section 3.
The blast material inside flows down and is similarly caused to fall from the bottom opening 11. In this way, the discharge device 12 is able to continuously drop the scattering material from the hold 3 into the sea, and the amount of falling scattering material is proportional to the rotation speed of the rotor 13.

Next, 23 is a hydraulic motor 16 of the second ejection device 12 from the front and a hydraulic motor 1 of the third ejection device 12 from the front.
6 is a hydraulic motor room in which . . . is installed, and 24 is a space in which a bearing 14 of a rotation center shaft 15 is installed, and both are located between the elongated hollow space 10 . The tops of these casings are all made into a sharp point so that the scrapped material in the hold 3 can flow smoothly. In addition, 25... are pillars hanging from the four corners of the hull 2,
At its tip is a roller 26 that guides the wire that is wound or unwound by the ship maneuvering winch 8b.
is provided.

27 is a tidal current suppression device, a hanging curtain 28.28, a weight 2
9...- and rotors 32, 32 for winding up the frame 30 and the vertical movement wire 31 as shown in FIG. Note that the vertical movement wire is prevented from moving by appropriate guides 33 and 34 as shown in FIG.

Although not shown in the living area, there are a measurement system for determining the position of the ship, a measurement system for determining the thickness of the bamboo spread on the seabed, and a hydraulic motor 16 for the discharge device 12. Control devices that control the rotation of... are centrally installed.

The method of using the work boat described above will be explained using the sand drain method as an example. First, the earth and sand carried by the earth carrier are loaded into the hold 3 of the work boat, which is held above the soft ground to be covered with sand. Next, the ship maneuvering winch 8a...
, 8b..., the wire whose tip is fixed with an anchor or the like is wound up or unwound to move it in a direction perpendicular to the longitudinal direction of the work boat. At the same time, the hydraulic motor 16 operates the discharge device 12...
... is rotated, and the earth and sand in the hold 3 is caused to fall from the bottom opening 11 by the discharge action of the rotor 13. Further, since the rotor 13 disposes a certain amount of earth and sand between its blades 19, it has the function of dropping almost the same amount of earth and sand over its entire length. Therefore, the discharge device 12 has approximately the same width as the length of the hold section 3 along the longitudinal direction of the work boat, and drops a certain amount of earth and sand in the width direction. As a result, the sand on soft ground can be laid properly.In addition, during this sand laying work, the worker always monitors the thickness of the sand spread on the seabed, and if the sand is spread on the seabed, If the thickness of
6. On the other hand, if the thickness of the earth and sand is insufficient, perform the adjustment in the same way as when the thickness of the earth and sand is excessive. Therefore, sand laying on soft ground can be carried out as planned and with high precision.

Additionally, if the amount of earth and sand in the cargo hold 3 decreases during sand-laying work, it is possible to continuously supply earth and sand by placing the earth carrier next to the work boat while the sand-laying work is in progress. This makes it possible to perform sand laying work.

Effects of the Invention As described above, according to the method of the present invention, while moving the workboat in a direction perpendicular to the longitudinal direction of the workboat, the molten material in the cargo hold is moved along the longitudinal direction of the workboat substantially in the same direction as the cargo hold. Since the material is allowed to fall into the sea from an opening formed in the bottom of the ship in a controlled manner, the amount of persimmon sprayed is approximately the same as the length of the hold section along the longitudinal direction of the work boat. Moreover, since the amount of spraying can be adjusted arbitrarily, there is a remarkable effect that it becomes possible to spray the mast material in the hold of the ship toward the sea with high precision and efficiency. , a bottom opening is provided along the longitudinal direction of the work boat and is formed to have approximately the same length as the cargo hold;
By installing a discharge device that allows the timber in the hold to fall into the sea from the bottom opening, the amount of fall can be adjusted freely, making it possible to efficiently scatter the timber in the hold into the sea with high precision. In addition, it can be used to move the workboat in its longitudinal direction when not spraying, which has the effect of reducing hull resistance and making the workboat easier to handle.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a work boat according to the present invention, FIG. 2 is an overall side view of the work boat, FIG. 3 is a plan view showing the upper deck surface of the work boat, and FIG. 4 (A) , (B) is a partially enlarged view and overall layout of the ejection device, FIG. 5 is a sectional view of the main parts of the ejection device, FIG. 6 is a perspective view of the frame, and FIG. 7 is a guide for the vertical movement wire. Perspective view showing the structure, Figure 8 (A)
-(E) are explanatory diagrams showing conventional examples. (Symbol) 1... Hull 3... Holds 3a, 8b... Maneuvering winch 11... Bottom opening 12... Discharge device Applicant Omotogumi Co., Ltd. Agent
Eiji Omura Figure 1 1... Hull 3... Hold 11... Vessel ffl1 openings 8a, 8b... Maneuvering winch 12... Discharge %M @ Figure 5 Procedure amendment Patent] Mr. Director, 1. Indication of 1. 2. Name of the invention. Method of dispersing equipment into the sea and the work boat used for it. 3. Relation to the case that will be amended. Patent applicant's address: Yama'E1-cho, Ichiyama, Okayama. El 1 No. 13 Name
Oki Kumizo Co., Ltd. 11 President and CEO Fumi Oki - 4. Attorney's specification 11 Name of the invention A method for dispersing equipment into the sea and a work boat used therein 2. Claim 1. While moving a work boat, (3) The equipment in the bottom opening (11) formed in the work boat's hold 1 (3)
) into the sea under a falling fLaim condition. 2. The bottom opening (
11) and a discharge device t (12) for freely dropping the equipment in the cargo hold (3) from the bottom opening (11) into the sea. Work boat used. 3. Detailed Description of the Invention Industrial Field of Application This invention is a method of underwater equipment useful in the sand drain construction method for soft ground improvement work on the seabed.
Conventional technology regarding methods and work vessels used. BACKGROUND OF THE INVENTION Conventionally, it has sometimes become necessary to spread materials such as earth and sand on the seabed for various purposes, and an example of this is the sand drain method used in repair work for soft seabed 111 decks. Hereinafter, for convenience of explanation, the explanation will be based on this sand drain construction method. Methods for distributing earth and sand to the seabed in the sand drain method generally include a direct method, a conveyor method, and an earth-lifting boat method. Direct casting methods include methods such as open-bottom soil transport vessels as shown in Figure 8 (a), side-barrel type soil transport vessels, and gatsuto vessels as shown in Figure 8 (b). However, open-bottom and side-barrel type soil transport vessels require less time to spread, and what they all have in common is that they are economical because their hulls serve as both carrier and spreading vessels. be. As for conveyor methods, as shown in Figure 8 (c), there are multiple hoppers on the ship's hull, and a conveyor guides the earth and sand flowing out from the hoppers to the overboard discharge port, where it is then discharged into the sea. By the scattering ships that were made to do so! 111rI, and when this occurs, it flows out of the hopper.''-The advantage is that the amount of spread can be adjusted by adjusting the spread of the grain, and that a substantially uniform I11 cloth can be produced continuously. . Next, as for the soil transport method, as shown in Figure 8 (d), the soil transported by the soil transport ship is stored in a packet P.
There are methods such as lifting the soil with a conveyor Q and then distributing it with a conveyor Q, or adding water to the MWI earth and sand using an earth carrier and lifting it with a pump R, as shown in Figure 8 (E). This has the advantage of allowing continuous spraying. Problems to be Solved by the Invention By the way, when it comes to the Wk distribution of earth and sand to the seabed in the sand train method, in order to improve its rationality, it is necessary to make the thickness of the earth and sand spread as evenly as possible on the sea bed and to improve efficiency. I
It is required that I cloth is possible. However, with the above-mentioned conventional standing method, it is difficult to distribute uniformly in a quantitative manner, and similarly, the conveyor method and the earth-lifting boat method are difficult to distribute at once. There are inconveniences such as a lack of efficiency due to the extremely small kln width, and there are currently no 11-spraying methods and devices that can achieve both uniform and efficient sprinkling on the seabed. Therefore, the present invention aims to solve the above-mentioned problems, and to provide a method for distributing equipment into the sea that makes it possible to uniformly and efficiently spread equipment into the sea at the same time, and a work boat for use in the method. It is something to do. Means for Solving the Problems The technical means of the present invention for achieving the above objects are described in the first section corresponding to the embodiment. Second. This will be explained using Figure +83. That is, the first invention, the method of spreading gold material to the ship, involves moving the work boat using appropriate ship maneuvering devices such as ship maneuvering winches (8a), (8b), etc. The equipment in L) is caused to fall into the sea from the bottom opening formed in the hold (3) of the work boat. The work boat used for dispersing equipment into the sea, which is the second project I11, has an opening in the bottom of the work boat's hold. In addition, a discharge device (12) such as a rotary feeder for dropping the bottle material in the cargo hold (3) into the sea from the +m bottom opening into the sea is provided. When the work boat is moved, the bottom opening formed in the hold section (3) of the work boat will also be perpendicular to the direction of movement of the work boat, and the equipment will be in the hold of the work boat! It will fall from the bottom opening with a width that is almost the same as (3). Further, as the work boat moves in a predetermined direction, the equipment falls from the bottom opening of the work boat while its falling amount is controlled by the discharge devices 21 (12). Therefore, the fall rate of the equipment can be adjusted arbitrarily depending on the position of the work boat. If the m material is heavy, such as earth and sand, the equipment ejected into the sea will inevitably reach the seabed, and the thickness of the equipment on the seabed will be adjusted freely. It becomes possible to do so. In addition, if the finger material is light, it will not fall directly to the seabed, but depending on the intended use, such scattering of the finger material may be effectively utilized. Embodiments Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. Figures tjS1 to tIS3 show the work boat of this invention, l is the outer plate a (2) and the cargo hold al (3) ToliJ living areaffl
(4) Bollards (6) fixed along the side outer panels on the upper deck (5)...1 Fairleads (1) fixed along the front and rear edges. 7)...
Four ship handling winches (8a) that move the mooring vessel (vtia) and the hull (1) in the longitudinal direction...and four winches (8a) that move the hull (1) in the left-right direction
...etc. are provided. Said hold! 'ffi (3) has a hopper structure with both side walls (9) narrowing downward, and its upper edge extends upwards from the upper deck to increase the loading capacity of finger materials. It is being In addition, the hold section (3) has an elongated space section (10)... which is divided into a plurality of sections in the longitudinal direction at its lower part, and the lower end of this elongated space section (lO)... is shown in figure f55. As shown in the figure, it is continuous with the bottom opening (11). Then, along this long space ff1 (10)..., a discharge device is used to drop the finger material loaded in the cargo hold (3) into the sea! 1 (12) ... 11 parts are located. In FIG. 4, to explain this ejecting device I (12)..., (13) is a rotor located in each of the elongated hollow spaces (10), and each rotor (13) is equipped with a bearing (14). )
... are connected in series by a rotation center shaft (15) supported by a hydraulic motor that is variably rotated in forward and reverse directions by a hydraulic pump (not shown). (16) and is immediately connected. In this embodiment, four sets of rotary feeder type discharge devices (12) as described above are independently arranged in the front and back direction. To explain in more detail with reference to FIG. 5, which shows the rotor (13) as a cross-sectional view, the rotation center shaft (15)
An outer cylinder (17) is fixed by a donut-shaped disk (18)..., and from the circumferential surface of this outer cylinder (17) there is a hole of approximately the same length as the above-mentioned Rinchoakikusho fig (10). Feather (1)
9)... are fixed radially and the blades (19)...
The tip of the seed material guide member (20) rotates in close proximity to the arc-shaped inner surface of the seed material guide member (20). (21) is the upper component (20a) of the seed material guide (20)
(22) is an outlet formed by the lower component (20b) of the seed material guide (20). The finger material flowing in from this finger material inlet (21) under its own weight is the blade (19) of the rotor (13) 1: mutual nt.
The blades (19) rotate around the central axis of rotation (15) as the hydraulic motor (16) rotates.
... and the bottle material guide (20) and are sequentially displaced toward the bottom opening (11). When the finger reaches the discharge port (22), the bottom opening (l)
fall into the sea from l). During this time, there is i1! between the following blades (19)...
As a result, the finger material in the hold (3) flows down and similarly falls from the bottom opening (11). And the ejection device! ! (12) allows the finger materials to be continuously dropped into the sea from the hold (3). Moreover, the falling value of the finger material is proportional to the rotation speed of the rotor (13). Next, (23) is the second discharge from the front*a(12
) hydraulic motor (16) and discharge device 21 (t5E) (
12) is a hydraulic motor room where the hydraulic motor (16) is installed, and (24)... is a space where the bearing (14) of the rotation center shaft (15) is installed. Local part (10)...located between each other, and both of these casing rri parts are sharp-pointed so that the finger material in the hold part (3) can flow smoothly. In addition, (25)... are pillars hanging from the four corners of the hull (2), and the above-mentioned ship maneuvering winch (8b)...
A roller (26) is provided for guiding the wire to be wound up or unwound. (27) is the N# flow suppression device, and the hanging curtain (28), (
28), weight (29)... and a frame (3) as shown in Figure 6.
It consists of rotors (3z), (32), etc. that wrap around wires (31), etc. for vertical movement. Incidentally, the vertical effect wire is prevented from moving by a suitable guide tool (33), <34) as shown in FIG. Although not shown in the living area, there are a measurement system for determining the position of the ship, a weighing system for determining the thickness of the finger material spread on the seabed, and a discharge device r1 (12)...
The control W1fi that controls the rotation of the hydraulic motor (16), etc. is intensively provided. The method of using the work boat described above will be explained using the sand drain construction method as an example. First of all, the hold of a work boat was held above this soft ground, where sand was to be applied! ! 1 (3) Load the earth and sand carried by the earth carrier. Next, the ship steering winch (8a)..., (8b)...
By winding and unwinding the wire whose tip is fixed with an anchor, it is moved in a direction perpendicular to the longitudinal direction of the work boat. Eject at the same time! In order to operate all (12)..., the hydraulic motor (16)... is rotated, and the discharge action of the rotor (13) causes the earth and sand in the hold 1s (3) to fall through the bottom opening (11)... let In addition, the rotor (13) is designed to interpose a certain amount of sand between its blades (19) and discharge the sand, so it has the ability to drop almost the same amount of sand over its entire length. There is. Therefore, the discharge device fi (12)... is approximately the same length as the hold section (3) along the longitudinal direction of the work boat, and also drops a certain amount of earth and sand in 10 directions. Therefore, sand on soft ground can be applied appropriately.Also, during this sand laying work, one worker always monitors the thickness of the sand spread on the seabed, and if there is If the thickness is too large, speed up the movement of the hull (1) or remove the rotor (13) of the ejector (12)...
Adjust the hydraulic motor (16) to slow down the rotation.2 Conversely, if the thickness of the earth and sand is insufficient, perform the adjustment in the opposite manner as when the thickness of the earth and sand is too thick. . In this way, the sand on the soft ground is spread as planned.
It will be enforced at 111/1 degree. In addition, if the earth and sand in the cargo hold PI (3) becomes low during sand-laying work, it is possible to move the earth-carrying vessel alongside the work vessel to supply earth and sand while the sand-laying work is in progress. ,'A systematic sand laying work becomes possible. Effects of the Invention As described above, according to this method of application, while moving a workboat, the finger material in the hold of the workboat is dropped from the bottom opening formed in the hold of the workboat into the sea. Since the material is allowed to fall 1 meter below the surface and the amount of spray can be adjusted arbitrarily, it has the remarkable effect of making it possible to spray the material in the hold of the ship toward the sea with high precision and efficiency.
Further, according to the work boat of the present invention, since a discharging device is provided which allows the finger material in the hold to fall into the sea from the bottom opening formed in the hold of the work boat, the finger material in the hold can be freely adjusted by the falling amount. It has now become possible to spray wood into the sea with high precision and efficiency. 4. Brief description of the drawings Figure 1 is a front sectional view of the work boat according to the present invention, Figure 2 is a sectional view of the work boat according to the present invention.
The figure is also an overall side view of the work boat, the third figure is a plan view showing the upper deck surface of the work vessel, and M4 figures (a) and (b) are partially enlarged views of the discharge device and the overall layout 2. , tj45 is a sectional view of the main part of the ejection device, and FIG. 6 is a perspective view of the frame.
Figure 7 is top and bottom! ! A perspective view showing the guide structure of the I river wire, mBPA (A) to (E) are explanatory views showing conventional examples. (Symbol) l... Hull 3... Hold parts 8a, 8b... Ship maneuvering winch 11... Bottom opening 12... Discharge device

Claims (1)

[Claims] 1. While moving the work boat in a direction perpendicular to its longitudinal direction, the scattering material in the hold section (3) is moved along the longitudinal direction of the work boat to approximately the same length as the hold section (3). The bottom opening (1
1) A method for distributing material into the sea, which is characterized by dropping the material into the sea under controlled conditions. 2. In order to spread the scattering material evenly on the seabed, the scattering material in the cargo hold (3) is inserted into the sea through the bottom opening (11), which is formed to have approximately the same length as the cargo hold (3), along the longitudinal direction of the work boat. A method for distributing pellets into the sea, characterized by dropping the pellets into the sea under controlled conditions. 3. The method for spreading spray material into the sea according to claim 2, wherein the spray material is earth and sand. 4 A bottom opening (11) formed along the longitudinal direction of the hull (1) to have approximately the same length as the hold (3);
11) A work boat used for distributing pellets into the sea, characterized by being equipped with a discharge device (12) for dropping the pellets in the cargo hold (3) from the cargo hold section (3) into the sea in an adjustable amount. 5. The ship (1) is equipped with ship steering winches (8a, 8b) that can guide it in any direction, forward, backward, left or right, a measurement system for determining the position of the ship, and a measurement system for determining the thickness of the blast material on the seabed. 5. A work boat used for distributing seedlings into the sea as set forth in claim 4, comprising: 6 The hold section (3) has a hopper structure that is continuous with the bottom opening (11), the material to be spread is earth and sand, and the discharge device (12
5. A work boat used for distributing seedlings into the sea according to claim 4, wherein said bar is a rotary feeder.