JP2017226404A - Container ship with loading capacity increased for reefer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container ship with a loading capacity increased to load a large quantity of refrigeration containers (reefers).SOLUTION: A hull comprises a plurality of transverse bulkheads 16, 17 that longitudinally divide a cargo hold into a plurality of container bays. Each transverse bulkhead is associated with a box type beam 20, and each box type beam extends over the full width of the hull to connect side parts of the upper edge of the hull or in a vicinity of the upper edge. The box type beam has a hollow rectangular cross section having four side faces 25, 26. Out of four side faces in at least one of the box type beams, at least one side face 26 facing the container bays is provided with an array of maintenance opening parts 22, and adjacent maintenance opening parts in the array are separated with a pitch P to make the shape and size of the maintenance opening part sufficient for access and maintenance, via the maintenance opening part, to the cooling unit of a refrigeration composite transportation container that faces the maintenance opening part.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates to container ships, i.e. ships configured for storage and transport of shipping containers. In particular, the present disclosure relates to a container ship having an increased loading capacity for loading a large amount of refrigerated containers (reefers).

background

  A container ship is a ship (cargo ship) designed and constructed to store and transport shipping containers (compound shipping containers). In general, container ships carry all cargo in truck-sized composite shipping containers. Container ships are a common means of commercial composite freight transportation, and currently carry most of the sea freight except bulk. The loading capacity of container ships is measured in units of TEU (Twenty-foot Equivalent Unit). In general cargo, 20 feet and 40 feet (2 TEU) ISO standard containers are combined, and the mainstream is 40 feet containers. Some current container ships have a capacity of over 20,000 TEUs.

  The transport container is loaded in a cargo hold in the hull, that is, below and on the main deck of the container ship. The storage space is divided into container bays in the longitudinal direction of the container ship, and is divided into a plurality of rows in the transverse direction of the hull. This storage space is divided in the vertical direction into a plurality of horizontal container layers called stages.

  Transport containers are stacked as high as possible, and some container ships operate with a maximum of 10 to 11 stages on the main deck.

  A refrigerated container, that is, a reefer, is one that is cooled for the transportation of cargo that is susceptible to temperature among the composite transportation containers (transport containers) used for composite cargo transportation. The reefer has an integrated cooling unit and relies on external power from power points such as land bases, container ships, and wharfs.

  Some reefers have an air cooling system, while others have a water cooling system. If the reefer is stored under the deck of a container ship, the water cooling system should significantly reduce the ventilation capacity requirements for removing the heat generated by the reefer from the cargo space compared to air cooling alone. Can do.

  The reefer cooling system is provided at one of the longitudinal ends of the container, and an access door to the interior of the container is provided at the other of the longitudinal ends. The cooling unit generally comprises a compressor and one or more fans. That is, it is equipped with components that can fail during operation and damage the contents of containers that require cooling. For this reason, the longitudinal end of the reefer where the cooling unit is provided needs to be accessible during transport for various reasons. First, access is required to connect the cooling unit to the power point. In the case of a water-cooled reefer, access is required to connect a water-cooling hose.

  Furthermore, it is necessary to access for maintenance and replacement of compressors and fans. Therefore, access must be provided so that the electrician on board can change the compressor and other parts of the cooling unit while the container is housed in the cargo compartment.

  In the past, the number of reefer containers has increased rapidly compared to regular containers. Therefore, it is necessary to increase the loading capacity of the container ship for carrying cargo including “large amount of reefer”.

  The reefer can be loaded into the ship or on the deck. However, the top level on the deck is generally not used for refrigerated containers. This is because lashing bridges and reefer access platforms are not high enough to allow sailors to reach the topmost container on the deck. Similarly, the uppermost stage in the hull cannot be used for a refrigerated container. This is because the box-shaped beam (also called a torsion beam) at the top of the transverse bulkhead cannot access the longitudinal end of the container at the same level as the box-shaped beam.

Abstract

  It is an object of the present invention to provide a container ship hull that overcomes or at least mitigates the above problems.

  These and other objects are achieved by the features indicated in the independent claims. Further embodiments will become apparent from the dependent claims, the description and the drawings.

  According to a first aspect, a hull of a container ship is provided. The hull is a cargo hold for loading a non-refrigerated combined transport container and a frozen combined transport container, the refrigerated container having a cooling unit provided with a cooling unit at one of its longitudinal ends, and the cargo hold extending in the longitudinal direction. A plurality of horizontal bulkheads that are divided into a plurality of container bays in the direction and box beams associated with the respective horizontal bulkheads, each box beam extending over the entire width of the hull, and Near the edge, the sides of the hull are connected to each other, the box beam has a hollow cross section having at least one side parallel to the transverse bulkhead, and the width of the container bay is divided into a plurality of container rows At least one service opening on at least one side of at least one of the box beams, the service opening being aligned with one of the rows, Above The shape and size of the equipment opening is such that the cooling unit of the refrigerated combined transport container facing the maintenance opening can be accessed and maintained via the at least one maintenance opening. To do.

  By providing a maintenance opening in the box beam so that the cooling unit provided in the refrigeration container can be accessed so as to face the maintenance opening, a crew member such as an electrician on board can Since such a refrigerated container can be maintained through the maintenance opening, the refrigerated container can be loaded on the upper level in the cargo hold at the same height as the box beam. Accordingly, unlike the case where only the non-refrigerated container can be loaded on the uppermost stage in the cargo hold in the conventional hull of the container ship, one or two additional stages can be used for loading the refrigerated container.

  In a first possible implementation of the first aspect, the pitch P between the container rows is somewhat larger than the width of one composite transport container, and the container of the four side faces of at least one of the box beams A row of maintenance openings is provided on the at least one side facing the bay, and each maintenance opening in the row is aligned with one of the container rows and is adjacent to the maintenance row in the row. Access to the cooling unit of the refrigerated combined transport container facing the maintenance opening via the maintenance opening, spaced from the opening by the pitch P, and the shape and size of the maintenance opening facing the maintenance opening And can be maintained.

  In a second possible implementation of the first aspect, the maintenance opening is a rounded rectangular opening.

  In a third possible implementation of the first aspect, the radius of the rounded corner is 200 mm or more.

  In a fourth possible implementation of the first aspect, a preferred peripheral reinforcement is welded to the contour of the maintenance opening.

  In a fifth possible implementation of the first aspect, the width of the maintenance opening is at least 1500 mm, preferably at least 1750 mm, more preferably at least 1890 mm.

  In a sixth possible implementation of the first aspect, the height of the maintenance opening is at least 400 mm, preferably at least 1200 mm, more preferably at least 2075 mm.

  In a seventh possible implementation of the first aspect, the four side surfaces of the box-shaped beam are formed of steel plates, and the thickness of the side surface provided with the one row of maintenance openings is defined in the box-shaped beam. Are formed by a steel plate that is thicker than would be required if the maintenance opening was not provided on the side surface at the same position.

  In an eighth possible implementation of the first aspect, the hull is provided with a connection point near a maintenance opening for connection to a cooling water hose of the cooling unit, and / or the hull comprises: A power point for supplying power to the cooling unit is provided in the vicinity of the maintenance opening.

  In a ninth possible implementation of the first aspect, an access opening is provided in an upper side surface of the box beam, and a lower side surface of the box beam is formed in the box beam from the access opening. A ladder stage extending to is provided.

  In a tenth possible implementation of the first aspect, a distance sufficient to accommodate a compressor of the cooling unit of the refrigerated container between the opposing sides of the box beam facing the container bay There is.

  In an eleventh possible implementation of the first aspect, the box beam forms the top of the partition.

  In a twelfth possible implementation of the first aspect, the pitch P is greater than or equal to 2438 mm. This pitch may be somewhat larger than the width of a composite shipping container having a width of 2438 mm. Further, this pitch may be a multiple of the width of the composite shipping container. The purpose is to align the maintenance openings with container rows in the container bay.

  In a thirteenth possible implementation of the first aspect, the pitch P is the same among all service openings in the row.

  In a fourteenth possible implementation of the first aspect, the height of the maintenance opening closest to the longitudinal end of the box beam is lower than the height of the other maintenance openings.

  In a second aspect, there is provided a container ship comprising a hull according to the first aspect or any of its implementations.

  The above-described aspects and other aspects of the present invention will be made clear by the embodiments described below.

  In the following detailed description of the present disclosure, the present invention will be described in more detail with reference to exemplary embodiments shown in the drawings.

It is a side view of a container ship concerning one embodiment. It is sectional drawing of the container ship shown in FIG. It is an elevation view of the hull of the container ship concerning one embodiment, and is a figure showing superstructure. FIG. 4 is a cutaway view of a part of the hull shown in FIG. 3, showing a container bay between a watertight bulkhead and an open bulkhead. FIG. 5 is an elevational view of the open bulkhead shown in FIG. 4 showing the position of the container relative to the bulkhead and the box beam. It is an elevational view of a partition provided with a box beam, and is a view showing a row of maintenance openings in a box beam according to an embodiment. It is a front view of the opening part for maintenance which concerns on one Embodiment. It is sectional drawing of the opening part for maintenance shown in FIG. 7, Comprising: It is a figure which shows a part of freezing container arrange | positioned so that a longitudinal direction edge part provided with a cooling unit may face the opening part for maintenance. It is a front view of the opening part for maintenance which concerns on another embodiment. FIG. 10 is a cross-sectional view of the maintenance opening shown in FIG. 9, showing a part of a refrigerated container arranged such that a longitudinal end portion provided with a cooling unit faces the maintenance opening. It is a side view of the longitudinal direction edge part of the refrigeration container provided with the cooling unit. It is a perspective side view of the horizontal partition which concerns on another embodiment. FIG. 4 is a longitudinal cross-sectional view of a portion of the hull shown in FIG. 3 showing two container bays between an open bulkhead and a closed bulkhead.

Detailed description

  FIG. 1 shows a side view of a container ship 1, that is, a ship suitable for loading and transporting a large number of transport containers, and FIG. 2 shows a stern view thereof.

  The container ship 1 includes a hull 2 that extends over the entire length between the spherical bow 7 and the stern 8 of the container ship 1. The hull 2 accommodates one or more engine rooms, fuel tanks, and other facilities necessary for the operation of the container ship 1. Most of the hull 2 is loaded with containers. A part of the cargo hold is shown in FIG. The container ship 1 is provided with one or more large-sized internal combustion engines for propulsion, that is, for driving the propeller 9. Moreover, in order to supply electric power and heat to various elements on the container ship 1 that consume electric power and heat, one or more auxiliary engines (generator sets) are provided. One or more steerings 10 are provided for controlling the direction of the container ship 1.

  The container ship 1 is provided with a bridge 3 and one or more chimneys 4. In the embodiment shown in FIG. 1, the design of this type of container ship 1 is called “twin island” because the superstructure of the bridge 3 is separated from the superstructure of the chimney 4. However, the container ship may have a so-called “single island” design where the bridge and chimney are a single unit.

  The containers 19 and 21 are refrigerated containers and non-refrigerated containers, and are loaded in a plurality of bays 12 distributed over the entire length of the container ship 1 in the hull 2 and on the main deck 29. Containers to be loaded are arranged in a plurality of rows 15 distributed over the width of the container ship 1 and arranged in a plurality of stages 14 in the height direction of the container ship 1. The bay 12 is generally partitioned by a lashing bridge 13 on the deck and partitioned by horizontal partition walls 16 and 17 in the cargo hold below the deck. The lashing bridge 13 extends to a height of about the fourth level, and is used to fix the composite shipping container by lashing.

  As shown in FIG. 3, the hull 2 has an elongated shape having a length, a width, and a height. The hull 2 is an embodiment built around a keel / double bottom. In the hull 2, steel plates and reinforcing beams similar to ribs / frames are arranged in a complicated manner, and a frame forming the side portion 5 of the hull 2 is fixed to the keel at an arbitrary angle. The main deck 29 is a metal plate work / plate structure / exposed deck that covers the upper part of the frame structure of the hull, and is supported by a box beam 20 attached to the upper part of the frame 31. The box beam 20 extends over the entire width of the container ship 1. The box beam 20 increases the strength of the entire hull 2. That is, not only the main deck 29 is supported, but also the hull 2 is strengthened and reinforced together with the deck, the frame, and the transverse bulkhead.

  The horizontal partition walls 16 and 17 divide the cargo hold into container bays in the longitudinal direction. In general, the distance between bulkheads corresponds to two 20 foot composite shipping containers 19, 21 or one 40 foot composite shipping container 19, 21. The transverse bulkheads 16 and 17 extend between the side portions 5 of the hull 2 and extend from the bottom 6 of the hull 2 to the box beam 20. The transverse bulkheads 16 and 17 are joined to the side portion 5 (frame 31), the bottom portion 6 of the hull, and the box beam 20 by welding. Since each horizontal partition 16, 17 is joined to the box beam 20, the box beam 20 becomes a part of each horizontal partition 16, 17. The horizontal partition walls 16 and 17 may be a closed type or an open type. Reference numeral 16 in the figure indicates a closed transverse partition, and reference numeral 17 indicates an open transverse partition. In general, the cargo hold in the hull 2 is divided into container bays 12 in the longitudinal direction by open transverse bulkheads 17 and closed transverse bulkheads 16 arranged alternately.

  As shown in more detail in FIGS. 4 and 5, the closed transverse partition wall 16 is provided with a plurality of stringer decks 18 at substantially the same height as the step 14. The stringer deck 18 functions as a sailor's platform. Together with the vertical beams, the stringer deck forms the frame of the transverse bulkheads 16,17. The closed transverse bulkhead 16 is open on one side and closed on the other side by a steel plate welded to the stringer deck 18 and the vertical beam. A crew member can access the longitudinal ends of the composite transport containers 19 and 21 facing the open side of the closed partition wall 16 from the stringer deck 18 for maintenance. Since the open bulkhead 17 is open on both sides, the crew can access the longitudinal ends of the combined transport containers 19 and 21 from both sides of the open bulkhead 17 for maintenance.

  The box beam 20 at the upper end of the horizontal partition walls 16 and 17 is a hollow beam constructed of a metal plate. The metal plate is a mild steel plate or the like normally used for construction of a ship hull, but other materials such as high-grade steel and composite materials may be used. The box beam 20 has a substantially rectangular cross section. This cross section need not be a perfect rectangle. That is, the beam may be substantially box-shaped, and one or more side surfaces of the box beam may have an arbitrary angle with respect to the adjacent side surface or the opposite side surface.

  In one embodiment, the box beam 20 has four side surfaces each formed of a steel plate. The lower lateral side surface 28 of the box beam 20 is welded to the upper ends of the partition walls 16 and 17. The upper side surface 25 of the box beam 20 is almost the same height as the main deck 29. At least one of the opposing vertical side surfaces 26 and 27 of the box beam 20 faces the container bay 12. The side surfaces 26 and 27 may be provided with a maintenance opening 22 for a crew member to access the cooling unit 30 at the longitudinal end of the refrigerated combined transport container 21 and perform maintenance. The interior of the box beam 20 serves as a passage for sailors, and generally a ladder stage is provided so that the box beam 20 can be accessed from the upper side surface 25 / main deck 29.

  As shown in FIGS. 4 to 13, the box beam 20 is provided with at least one maintenance opening 22. The maintenance opening 22 is arranged in alignment with the row 15 and the step 14 of the combined transport containers 19 and 21 in the container bay 12 facing the side surfaces 26 and 27 of the box beam 20. A plurality of maintenance openings 22 may be provided in the box beam 20, and each maintenance opening 22 may be aligned with the row 15 and the step 14 of the composite shipping container.

  In one embodiment, the at least one box beam 20 is provided with at least one service opening 22. In another embodiment, two or more box beams 20 are provided with at least one service opening 22. In one embodiment, at least one box beam 20 is provided with a row of maintenance openings 22, and each maintenance opening is aligned with row 15 and step 14, so that the pitch P between the maintenance openings is Is the same as the pitch P between the rows 15 of the composite transport containers 19, 21. Since the combined transport containers 19 and 21 have a width of 2.438 m, the pitch P between the rows 15 and the pitch P between the maintenance openings 22 are at least 2.438 m.

  Even if the box beam 20 is provided with one or more maintenance openings 22 on one of the side surfaces 26 and 27 facing the container bay 12, one or more are provided on both the side surfaces 26 and 27 facing the container bay 12. The maintenance opening 22 may be provided.

  The thickness of the side surfaces 26 and 27 of the box-shaped beam 20 provided with one maintenance opening 22 or a row of the maintenance openings 22 is equal to the side opening 26 and 27 at the same position in the box-shaped beam 20. It is formed of a steel plate that is thicker than would be required if the portion 22 was not provided.

  In one embodiment, there is sufficient distance between the opposing side surfaces 26, 27 of the box beam 20 facing the container bay 12 to accommodate the compressor of the cooling unit 30.

  In one embodiment, most or all of the service openings 22 are the same shape and dimensions. However, in particular, the maintenance opening 22 located near the side 5 of the hull 2 may need to be reduced in height for structural (strength) reasons. FIG. 6 shows a box beam 20 in which maintenance openings 22 with equal intervals are provided in a row. Each service opening 22 is aligned with row 15. The height of the maintenance opening 22 arranged closer to the center is significantly larger than the maintenance opening 22 arranged on the outermost side. In the present embodiment, the width B of the maintenance openings 22 in the row is the same for all the maintenance openings 22.

  The height at which the maintenance opening 22 is disposed with respect to the container bay 12 (or the bottom 6) is properly aligned with the step 14 as shown in FIGS. 8 and 10, for example. To choose. There are two different heights for the combined shipping container (2.591 m for the normal combined shipping container and 2.896 m for the high cube combined shipping container), so the position (height) of the maintenance opening 22 is of the level 14. It is necessary to plan at the time of construction and loading of the hull 2 so as to surely match the height.

  7 and 8 show an embodiment of the maintenance opening 22. In particular, these figures show the contour shape of the maintenance opening 22. 7 and 8 show a method of aligning the position of the refrigerated combined transport container 21 with the position of the maintenance opening 22. The maintenance opening 22 has a height above the bottom 6 of the container bay 12 and is disposed at substantially the same height as the step 14. Thereby, the refrigerated composite transport container 21 can be arranged in a state in which the cooling unit 30 faces the maintenance opening 22 of the box beam 20.

  The maintenance opening 22 shown in the present embodiment has a rectangular outline having a height H and a width B. However, the maintenance opening need not be rectangular, and the contour of the maintenance opening 22 may be other shapes such as an oval, an ellipse, or a triangle. Service opening 22 may be formed with a plurality of smaller openings that are sized and shaped to allow access to serviceable equipment of cooling unit 30. By providing the maintenance opening 22 with a hatch structure (not shown) such as a cover that is structurally engaged with the maintenance opening, the box beam 20 is reinforced and the maintenance opening 22 is provided. The reduction in the strength of the box beam 20 due to this may be compensated. Furthermore, the horizontal partition walls 16 and 17 or the box beam 20 are provided with additional end support portions and / or vertical support portions to reinforce the structure, and the strength reduction due to the provision of the opening 22 for maintenance on the box beam is reduced. It may be supplemented. Similarly, the main deck may be extended into the box beam by an arbitrary distance to reinforce the structure and compensate for the strength reduction caused by providing the opening 22 for maintenance on the box beam.

  The corners of the contour of the maintenance opening 22 are rounded with a radius R to prevent cracking of the metal plate from these corners. In one embodiment, the radius R is at least 200 mm. In one embodiment, the width of the service opening 22 is at least 1500 mm, preferably at least 1750 mm, more preferably at least 1890 mm. In one embodiment, the height of the service opening 22 is at least 400 mm, preferably at least 1200 mm, more preferably at least 2075 mm.

  9 and 10 show another embodiment of the maintenance opening 22. This embodiment is basically the same as the embodiment shown in FIGS. 7 and 8, but in this embodiment, the edge (inner side) of the maintenance opening 22 is reinforced by the peripheral flange 24. In one embodiment, the circumferential flange 24 is a steel plate welded to the inside of the maintenance opening 22, that is, welded to the plates 26 and 27 of the box beam 20. The reinforcing flange 24 reinforces the maintenance opening 22, whereby the corner radius R of the maintenance opening 22 can be made less than 200 mm.

  The size of the service opening 22 is preferably selected so that all serviceable components of the cooling unit 30 can be properly accessed and serviced. The cooling unit 30 includes a compressor, a fan 33 and a controller, a display, an expansion valve, a data logger, and other components. FIG. 11 illustrates some of the serviceable components of the exemplary cooling unit 30. The serviceable components include a fan 33, a compressor, and the like.

  The outline of the compressor is shown by a dotted rectangle 34 in FIG. The hatched area 35 shows the general location of the connection point for connecting the hose of the ship's water cooling system to the refrigerated combined shipping container 21. The maintenance opening 22 should be sufficiently sized and placed in an appropriate position so that not only the compressor can be serviced, but also the compressor can be removed and replaced. Rounded rectangle 32 shows the contour of maintenance opening 22 properly sized and shaped for proper maintenance and access to the components of cooling unit 30.

  FIG. 13 shows two container bays 12 between the three horizontal partition walls 16 and 17. In the container bay 12, composite transport containers 19 and 21 are loaded, respectively. The central transverse bulkhead 17 is an open bulkhead, and the two outer lateral bulkheads 16 are closed bulkheads. In FIG. 13, six-stage composite transport containers 19 and 21 are loaded in the container bay 12. The height of each stage is substantially the same as that of the stringer deck 18 at the lower stage, and is substantially the same as the height of the opening 22 for maintenance at the uppermost stage.

  The container bay 12 shown on the left side of FIG. 13 is loaded with 20 feet of combined transportation containers 19 and 21, and the container bay 12 shown on the right side of FIG. 13 is loaded with 40 feet of combined transportation containers 19 and 21. Yes. Any of these bays 12 can carry 20 feet of combined shipping containers 19, 21 or 40 feet of combined shipping containers 19, 21. Which one is loaded may be selected at the time of loading. FIG. 13 also shows an access point X for connecting the refrigerated combined transport container 21 to the electrical system of the container ship 1. When the container ship 1 is provided with a water cooling system and the refrigerated combined transport container 21 is suitable for water cooling, the access point X indicates a hose of the water cooling system of the container ship. The access point X is located near the maintenance opening 22 so that the crew can easily connect the refrigerated combined shipping container 21 to the power distribution network of the container ship and / or the water cooling system of the container ship.

  FIG. 13 shows an embodiment in which maintenance openings 22 are provided on the side surfaces 26 and 27 of the box beams 20. This is a matter of design choice, and one or more maintenance openings 22 can be provided in only one box beam 20 of the hull 2. The number of box beams 20 provided with maintenance openings 22, the number of side surfaces 26 and 27 of box beams 20 provided with maintenance openings 22, and the number of maintenance openings 22 on side surfaces 26 and 27 are as follows. The selection may be made according to the necessity of loading the refrigerated composite transport container 21 onto one or a plurality of stages 14 having the same height as the box beam 20. Although not shown, in the case of a large box beam 20 having a height extending over a plurality of steps 14, the maintenance openings 22 are formed at a plurality of heights in the box beam 20 so as to correspond to the plurality of steps 14. It may be provided.

  When the opening 22 for maintenance is provided in the box-shaped beam 20, when the longitudinal end portion of the composite transport container 21 including the cooling unit 30 faces the maintenance opening 22 of the box-shaped beam 20, the frozen composite The transport container 21 can be arranged on the same level as the box beam. Therefore, by providing the maintenance opening 22, it is possible to increase the number of refrigerated composite transport containers 21 that can be loaded.

  While the invention has been described with reference to the above embodiments, other modifications to the disclosed embodiments can be made by practicing the claimed invention by studying the drawings, the disclosure, and the appended claims. It can be understood and performed by those skilled in the art. In the claims, the word “comprising” does not exclude other elements or steps, and the singular does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used effectively. Any reference signs in the claims should not be construed as limiting the scope.

Claims (12)

The hull (2) of the container ship (1),
A cargo hold for loading a non-refrigerated combined transportation container (19) and a frozen combined transportation container (21), the refrigerated container (19) having a cooling unit (30) at one of its longitudinal ends. And
A plurality of transverse bulkheads (16, 17) for dividing the cargo hold into a plurality of container bays (12) in the longitudinal direction;
A box beam (20) associated with each transverse bulkhead (16, 17),
Each box beam (20) extends across the entire width of the hull (2) and connects between the sides (5) of the hull at or near the upper edge of the hull (2),
The box beam (20) has a hollow cross section with at least one side (26, 27) parallel to the transverse bulkhead (16, 17);
The width of the container bay (12) is a hull (2) divided into a plurality of container rows (15),
At least one service opening (22) is provided in the at least one side surface (26, 27) of at least one of the box beams (20), and the service openings (22) are arranged in the row. The shape and size of the maintenance opening (22) aligned with one of (15), the cooling unit (30) of the refrigerated combined transport container (21) facing the maintenance opening (22), Hull (2) characterized in that it can be accessed and maintained through said at least one maintenance opening (22). The pitch (P) between the container rows (15) is somewhat larger than the width of one combined transport container (19, 21),
Of the four side surfaces of at least one of the box beams (20), a row of maintenance openings (22) is provided on the at least one side surface (26, 27) facing the container bay (12). Each service opening (15) in the row is aligned with one of the container rows (15) and spaced from the adjacent service opening (22) in the row by the pitch P. The shape and size of the maintenance opening (22) is such that the cooling opening (22) of the refrigerated combined transport container (21) facing the maintenance opening (22) has the maintenance opening (22). The hull (2) according to claim 1, wherein the hull (2) can be accessed and maintained via the.   Hull (2) according to claim 1 or 2, wherein the at least one maintenance opening (22) is a rounded rectangular opening.   The hull (2) according to claim 3, wherein a radius R of the rounded corner is 200 mm or more.   Hull (2) according to any of the preceding claims, wherein a preferred peripheral reinforcement (24) is welded to the contour of the maintenance opening (22).   Hull (2) according to any of the preceding claims, wherein the width of the maintenance opening (22) is at least 1500 mm, preferably at least 1750 mm, more preferably at least 1890 mm.   Hull (2) according to any of the preceding claims, wherein the height of the maintenance opening (22) is at least 400 mm, preferably at least 1200 mm, more preferably at least 2075 mm.   The four side surfaces of the box beam (20) are formed of a steel plate, and the thickness of the side surface provided with the row of maintenance openings (22) is the side surface at the same position of the box beam (20). The hull (2) according to any of claims 1 to 7, wherein the hull (2) is formed of a steel plate that is thicker than would be required if the maintenance opening (22) was not provided.   In the hull (2), a connection point (X) for connecting to the cooling water hose of the cooling unit (30) is provided in the vicinity of the maintenance opening (22) and / or the hull (2) The hull (2) according to any of claims 1 to 8, wherein a power point (X) for supplying power to the cooling unit (30) is provided in the vicinity of the maintenance opening (22).   Between the opposing side surfaces (26, 27) of the box beam (20) facing the container bay (12), the compressor of the cooling unit (30) of the refrigerated container (21) is accommodated. Hull (2) according to any of the preceding claims, wherein there is a sufficient distance.   The box beam (20) includes four side surfaces (25, 26, 27, 28) including the one side surface (26, 27) having the maintenance opening (22) facing the container bay (12). Hull (2) according to any of the preceding claims, having a hollow rectangular cross section with   A container ship (1) comprising the hull (2) according to any one of claims 1 to 11.