Work boat

Abstract

To provide a workboat that can be easily switched between offshore wind power generation and other uses such as marine resource development. [Solution] The work vessel has a cargo loading area located below the upper deck, which has a plurality of compartments separated by partitions, and the plurality of compartments includes a dual-purpose compartment with an opening leading to the upper deck and an inlet / outlet section for loading liquid cargo.

Description

[Technical Field]

[0001] The present invention relates to a work boat. [Background technology]

[0002] When constructing a floating offshore wind power generation facility such as that shown in Patent Document 1, it is necessary to transport mooring ropes and other equipment used to moor the float to the construction site. A work vessel is used for such transportation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-163979 Summary of the Invention [Problem to be solved by the invention]

[0004] The construction of floating offshore wind power generation facilities can have busy and slow seasons. For this reason, if a dedicated work vessel is prepared for floating offshore wind power generation facilities, the utilization rate will decrease during the slow season, and the maintenance costs of the vessel will not be recouped. Therefore, it is conceivable to repurpose work vessels used for marine resource development, such as oil and gas, for the construction of floating offshore wind power generation facilities. However, conventional work vessels are not easily repurposed, posing challenges in terms of cost and operational efficiency.

[0005] The present invention has been made in consideration of these circumstances, and aims to provide a work boat that can be easily switched between offshore wind power generation and other uses such as marine resource development. [Means for solving the problem]

[0006] In order to solve the above problem, a work vessel according to one aspect 1 of the present invention has a cargo loading area arranged below the upper deck, the cargo loading area having a plurality of compartments separated by partitions, and the plurality of compartments including a dual-purpose compartment having an opening leading to the upper deck and an inlet / outlet section for loading liquid cargo. [Effects of the Invention]

[0007] According to the above-described aspects of the present invention, a work boat can be provided that can be easily switched between offshore wind power generation and other uses such as marine resource development. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view showing an example of the layout of a cargo ship according to an embodiment of the present invention. [Figure 2] FIG. 1 is a plan view showing an example of the layout of a cargo ship according to an embodiment of the present invention. [Figure 3] FIG. 3 is a perspective view illustrating the layout of FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2. [Figure 5] FIG. 3 is an enlarged view showing a portion of FIG. 2 in more detail. DETAILED DESCRIPTION OF THE INVENTION

[0009] The work boat of this embodiment will be described below with reference to the drawings. As shown in FIG. 1, the work boat 1 includes an upper deck area A1, a cargo loading area A2, a living area A3, and an engine area A4. The upper deck area A1 is an area above the upper deck 3. Some cargo may be loaded in the upper deck area A1, i.e., on the upper deck 3. The cargo loading area A2 is an area below the upper deck 3. The cargo loading area A2 will be described later. An engine room and the like are located in the engine area A4. Note that the layout of each area A1 to A4 shown in FIG. 1 is a schematic diagram and does not limit the present disclosure.

[0010] The work vessel 1 can be switched between offshore wind power generation and other uses (for example, marine resource development). When constructing a floating offshore wind power generation facility, the work vessel 1 is used to tow floating structures and transport anchors, mooring lines, anchor chains, etc. for mooring the floating structures to the seabed. When developing marine resources, the work vessel 1 transports liquid cargo, powdery cargo, solid cargo, etc. Examples of liquid cargo include fuel oil, methanol, mud, brine, fresh water, etc. Examples of powdery cargo include dry bulk, etc. Dry bulk includes barite, bentonite, cement, etc.

[0011] FIG. 2 is a plan view of the work boat 1. As shown in FIG. 2, the work boat 1 is provided with multiple compartments 101-118. These compartments 101-118 are arranged, for example, in the cargo loading area A2, i.e., below the upper deck 3. The compartments 101-118 are each separated from one another by a partition B. The partition B is, for example, a steel wall. The work boat 1 is equipped with two propeller power shafts 11, 12. The propeller power shafts 11, 12 extend in the longitudinal direction L of the hull 2 ​​and are arranged side by side in the width direction W. The propeller power shafts 11, 12 are arranged, for example, to transverse the cargo loading area A2 in the longitudinal direction L in a plan view.

[0012] Propellers 11a, 12a are provided at the rear ends of the propeller power shafts 11, 12. A drive unit 10 is disposed at the tip ends of the propeller power shafts 11, 12. The drive unit 10 is disposed in the engine area A4. When the drive unit 10 rotates the propeller power shafts 11, 12, power is transmitted to the propellers 11a, 12a, and propulsion force for the work boat 1 is obtained.

[0013] An example of allocation of uses to the multiple compartments 101-118 will be described below. However, the allocation described below is merely an example and may be changed. Compartments 101-106 are used as dedicated fuel compartments, for example, to store fuel oil. Compartments 107 and 108 are used as dedicated anchor chain compartments, for example, to store anchor chain. Compartments 109 and 110 are used as dual-purpose compartments, for example, to store fuel oil or anchor chain. Compartments 111-116 are used as dual-purpose compartments, for example, to store anchor chain or liquid cargo. Compartments 117 and 118 are used as dual-purpose compartments, for example, to store dry bulk tanks T or mooring lines.

[0014] <Dual-use sections 111-116> The dual-purpose sections 111 to 116 are arranged in three rows in the longitudinal direction L and in two rows in the width direction W. The dual-purpose sections 111 to 113 are arranged in the longitudinal direction L and partially overlap the propeller power shaft 11 in plan view. The dual-purpose sections 114 to 116 are arranged in the longitudinal direction L and partially overlap the propeller power shaft 12 in plan view.

[0015] 3, in the compartments 101 to 118, sloped sections S are provided at the bottoms of the portions that overlap the propeller power shafts 11, 12 in a plan view. By providing sloped sections S in this way, the bottom walls of the compartments 101 to 118 do not interfere with the propeller power shafts 11, 12, and arrangement space for the propeller power shafts 11, 12 can be secured.

[0016] Figure 4 is a cross-sectional view taken along the line IV-IV in Figure 1. Note that cross sections at positions other than the line IV-IV in the longitudinal direction L also have the same positional relationship with the inclined portion S and the propeller power shaft 12 as in Figure 4. Although not shown, cross sections of portions that overlap with the propeller power shaft 11 in plan view also have the same positional relationship with the inclined portion S of each section and the propeller power shaft 11 as in Figure 4.

[0017] As shown in FIG. 4 , the dual-purpose compartment 115 is provided with an opening H and a filling and discharging section P. The opening H is provided in the ceiling wall of the dual-purpose compartment 115. For example, by opening a closing device (such as a hatch) of the opening H, the upper part of the dual-purpose compartment 115 can be opened to the upper deck 3, and anchor chains and the like can be stored in the dual-purpose compartment 115. Alternatively, by opening the closing device of the opening H, anchor chains and the like stored in the dual-purpose compartment 115 can be removed. In other words, the opening H can be used when the work vessel 1 is used for offshore wind power generation. The filling and discharging section P is used to store liquid cargo in the dual-purpose compartment 115 and to remove liquid cargo from the dual-purpose compartment 115. In other words, the filling and discharging section P can be used when the work vessel 1 is used for marine resource development. The filling and discharging section P is, for example, piping.

[0018] When storing an anchor chain in the multi-purpose compartment 115, for example, deck equipment (such as a crane) provided on the upper deck 3 is used to hang the anchor chain through opening H equipped with a closing device into the multi-purpose compartment 115 and allow it to gradually fall. Here, as shown in FIG. 4 , opening H equipped with a closing device and sloped portion S are positioned so that they overlap in the width direction W. Although not shown, opening H and sloped portion S are also positioned so that they overlap in the longitudinal direction L. In other words, sloped portion S is located directly below opening H. Therefore, when the anchor chain is hung from opening H, it slides down along sloped portion S at the bottom of the multi-purpose compartment 115. This makes it possible to prevent the anchor chain from getting tangled inside the multi-purpose compartment 115.

[0019] The partitions B of the compartments 101 to 118 may be corrugated to ensure the strength of the hull 2. This makes it possible to prevent liquid cargo or cleaning liquid from accumulating on the uneven surfaces when cleaning the multi-purpose compartments 111 to 116.

[0020] 5, stiffeners M may be provided in the partitions B between the compartments 101-118. The stiffeners M are members extending in the vertical direction Z and are arranged, for example, sandwiched between the bottom wall and the top wall of the compartments 101-118. This ensures the strength of the hull 2. When the work vessel 1 is switched from marine resource development to offshore wind power generation, liquid cargo adhering to the walls of the dual-purpose compartments 111-116 may need to be cleaned. In this case, if the stiffeners M are arranged inside the dual-purpose compartments 111-116, the liquid cargo and cleaning liquid are likely to accumulate in corners formed by the stiffeners M and the partitions B. Therefore, in this embodiment, the stiffeners M are not arranged inside the dual-purpose compartments 111-116, but are arranged outside the dual-purpose compartments 111-116. The bottom walls of the multi-purpose compartments 111 to 116 have inclined portions S, so that liquid cargo and cleaning fluid can be collected along the inclined portions S in one place.

[0021] Although not shown in the figures, the dual-purpose compartments 111-114, 116 are each provided with an inlet / outlet section P, an opening H equipped with a closing device (such as a hatch), and an inclined section S. Therefore, all of the dual-purpose compartments 111-116 can be used for both storing anchor chains for offshore wind power generation and storing liquid cargo for marine resource development. The other compartments may also be provided with similar openings H or inlet / outlet sections P equipped with closing devices.

[0022] <Second dual-use section 117, 118> As shown in FIG. 2 , the second dual-purpose compartments 117, 118 are located at the outer ends in the width direction W and face the side wall 4 of the hull 2. The two second dual-purpose compartments 117, 118 are arranged in the width direction W so as to sandwich the dual-purpose compartments 111-116 therebetween. The second dual-purpose compartments 117, 118 have a larger occupied area than the dual-purpose compartments 111-116 in a plan view. More specifically, the dimensions of the second dual-purpose compartments 117, 118 in the longitudinal direction L are larger than those of the dual-purpose compartments 111-116. However, the size of the second dual-purpose compartments 117, 118 may be changed. The second dual-purpose compartments 117, 118 may not have the inclined portion S, and the partition B may not be provided between the second dual-purpose compartments 117, 118 and the propeller power shafts 11, 12.

[0023] When the work vessel 1 is used for marine resource development, the second multi-purpose compartments 117, 118 can accommodate, for example, a tank T for dry bulk cargo. When the work vessel 1 is used for offshore wind power generation, the second multi-purpose compartments 117, 118 can accommodate, for example, a reel for winding up a mooring line. In either of the above uses, the second multi-purpose compartments 117, 118 can also accommodate fuel oil or the like. Since the second multi-purpose compartments 117, 118 face the side wall 4, it is possible, for example, to drill a hole in the side wall 4 and move the tank T or reel in and out of the second multi-purpose compartments 117, 118 through the hole.

[0024] As described above, the work boat 1 of this embodiment has a cargo loading area A2 located below the upper deck 3. The cargo loading area A2 has multiple compartments 101-118 separated by partitions B, and each of the compartments 101-118 includes dual-purpose compartments 111-116 equipped with an opening H equipped with a closing device that leads to the upper deck 3 and an inlet / outlet portion P for loading liquid. When the work boat 1 is used for offshore wind power generation, anchor chains and the like can be stored in the dual-purpose compartments 111-116 through the opening H equipped with a closing device. When the work boat 1 is used for marine resource development, liquid cargo can be stored in the dual-purpose compartments 111-116 through the inlet / outlet portion P. This makes it easy to change the use of the work boat 1.

[0025] The work vessel 1 also includes propeller power shafts 11, 12 and a drive unit 10 that drives the propeller power shafts 11, 12. The propeller power shafts 11, 12 are disposed in positions that overlap the multi-purpose compartments 111-116 in a plan view, and sloped sections S are provided on the bottom walls of the multi-purpose compartments 111-116 at portions that overlap the propeller power shafts 11, 12. With this configuration, when the multi-purpose compartments 111-116 are used to store anchor chains, the anchor chains can be stored so that they slide along the sloped sections S. This prevents the anchor chains from becoming tangled in the multi-purpose compartments 111-116. Furthermore, when the multi-purpose compartments 111-116 are cleaned after being used to store liquid cargo, cleaning liquids and the like can be collected in one place along the sloped sections S and easily discharged from the multi-purpose compartments 111-116.

[0026] The multiple compartments 101-118 also include multiple dual-purpose compartments 114-116. The multiple dual-purpose compartments 114-116 are arranged side by side in the axial direction (longitudinal direction L) of the propeller power shaft 12, and a sloped section S is provided on the bottom wall of each of the multiple dual-purpose compartments 114-116 at a portion that overlaps with the propeller power shaft 12 in a plan view. With this configuration, the propeller power shaft 12 can be arranged in the space created by the sloped section S. In other words, the sloped section S, which is provided to ensure the space for arranging the propeller power shaft 12, can be used to store mooring chains in the dual-purpose compartments 114-116 or to clean the dual-purpose compartments 114-116. The same effects as those described above can also be obtained with the arrangement of the dual-purpose compartments 111-113 and the propeller power shaft 11.

[0027] The multiple compartments 101-118 also include two second dual-purpose compartments 117, 118 capable of accommodating a tank T, and the two second dual-purpose compartments 117, 118 are located at the outer ends of the hull 2 ​​in the width direction W. With this configuration, for example, a temporary opening can be provided in the side wall 4 of the hull 2, and the tank T can be loaded and unloaded into the second dual-purpose compartments 117, 118 through the opening. This makes it easy to switch between a state in which the tank T is located in the second dual-purpose compartments 117, 118 and a state in which the tank T is not located. When the tank T is located in the second dual-purpose compartments 117, 118, dry bulk cargo can be stored in the tank T. When the tank T is not located in the second dual-purpose compartments 117, 118, reels for winding up mooring ropes used in the construction of offshore wind power generation can be located in the second dual-purpose compartments 117, 118.

[0028] Furthermore, the two second dual-purpose compartments 117, 118 are arranged so as to sandwich the dual-purpose compartments 111-116 between them. With this arrangement, the dual-purpose compartments 111-116 are arranged in positions that overlap with the propeller power shafts 11, 12 in a plan view, and the two second dual-purpose compartments 117, 118 can be arranged at the outer ends in the width direction W. Therefore, the space inside the hull 2 ​​can be used without waste.

[0029] Furthermore, stiffeners M extending in the vertical direction may be arranged in the partition B. In the example of FIG. 5, the stiffeners M do not protrude into the inside of the dual-purpose compartments 111-116. Therefore, when the dual-purpose compartments 111-116 are cleaned after liquid cargo has been stored in them, it is possible to prevent the liquid cargo or cleaning liquid from accumulating in the unevenness caused by the stiffeners M. This makes it easier to clean the dual-purpose compartments 111-116. Furthermore, the stiffeners M ensure the strength of the hull 2.

[0030] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0031] For example, the work boat 1 in the above embodiment was equipped with six dual-purpose compartments 111-116. However, the number of dual-purpose compartments can be changed, and may be only one. Similarly, the number of second dual-purpose compartments 117, 118, the number of dedicated anchor chain compartments 109, 110, and the number of dedicated fuel compartments 101-106 can also be changed. Similarly, the number of propeller power shafts may be changed. Note that the dual-purpose compartments 111-116 may be referred to as first dual-purpose compartments 111-116 to distinguish them from the second dual-purpose compartments 117, 118.

[0032] In addition, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and variations may be combined as appropriate, without departing from the spirit of the present invention. [Explanation of symbols]

[0033] 1...Work boat 2...Hull 3...Upper deck 10...Drive unit 11, 12...Propeller power shaft 101-118...Compartments 111-116...Multipurpose compartments 117, 118...Second multipurpose compartment A2...Cargo loading area B...Partition H...Opening M...Stiffener P...Inlet / outlet section S...Slope T...Tank W...Width direction Z...Vertical direction

Claims

1. a cargo loading area located below the upper deck; a propeller power shaft; a drive device that drives the propeller power shaft, the cargo loading area has a plurality of compartments separated by partitions; The plurality of compartments include a dual-purpose compartment having an opening leading to the upper deck and an inlet / outlet for loading liquid cargo; The propeller power shaft is arranged at a position overlapping with the dual-use compartment in a plan view, A work boat, wherein a sloped portion is provided at the bottom of the dual-purpose compartment at a portion that overlaps with the propeller power shaft in a plan view.

2. The plurality of compartments includes a plurality of the dual-purpose compartments, The multiple dual-purpose compartments are arranged side by side in the axial direction of the propeller power shaft, The work boat according to claim 1 , wherein an inclined portion is provided in a portion of the bottom wall of each of the plurality of dual-purpose compartments that overlaps with the propeller power shaft in a plan view.

3. the plurality of compartments include two second dual-purpose compartments capable of accommodating tanks; The work boat according to claim 1 or 2, wherein the two second dual-purpose compartments are arranged at outer ends in the width direction of the hull.

4. The work boat according to claim 3 , wherein the two second dual-purpose compartments are arranged to sandwich the dual-purpose compartment therebetween.

5. A stiffener extending in the vertical direction is disposed on at least a portion of the partition, 2. The work vessel according to claim 1, wherein the stiffeners do not protrude into the interior of the dual-purpose compartment.

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