JP5159728B2 - Car carrier - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a dedicated automobile ship provided with a plurality of storehouses each accommodating a vehicle, and more particularly to a dedicated automobile ship having a ventilation device that reduces the wind pressure of the hull.

  Automobile ships that transport vehicles by sea include PCC that transports passenger cars exclusively and PCTC that transports passenger cars and trucks in a mixed manner. These automobile-only ships are provided with a plurality of loading decks, that is, car decks, in the hull, and a cargo hold is formed in the hull with a layered structure, for example, on the order of ten or more floors. When loading work is carried out to carry a vehicle from the quay of the departure port to an automobile dedicated ship, the vehicle travels in each hold. Similarly, when unloading work is carried out in order to carry the vehicle from the car carrier to the quay of the port of call, the vehicle travels in each hold. When loading and unloading operations are performed, each hold is ventilated by a ventilator so that exhaust gas discharged from the traveling vehicle does not fill the hold. When an automobile-only ship sails on the sea, the inside of the hold is regularly ventilated.

  In order to introduce outside air into the hold and discharge the air in the hold to the outside to ventilate the hold, vent ducts or ventilation ducts are arranged vertically along the left and right sides of the hull. In a conventional automobile-only ship, the upper end portion of the ventilation duct projects upward from the upper deck, and the opening provided at the upper end portion serves as a ventilation opening. The ventilation duct is provided with a ventilation opening that opens to the hold, and the ventilation opening and the ventilation opening are communicated by the ventilation duct. A ventilation fan driven by a motor is provided in each ventilation duct, and ventilation in the hold is performed by an air flow generated by the ventilation fan. In order to ventilate a plurality of layers of the cargo hold with one ventilation duct, the ventilation duct is provided with a plurality of ventilation openings corresponding to the plurality of layers of the hold.

  Since there is a limit to increasing the cross-sectional area of one ventilation duct, multiple ventilation ducts are arranged close to the hull wall of the hull, and the upper ends of the ventilation ducts protrude from the upper deck. Will be attached. A lid member for opening and closing the ventilation opening is provided at the upper end of each ventilation duct so as to be openable and closable as described in Patent Document 1, and the upper deck is covered so as to cover the upper ends of the plurality of ventilation ducts. Is fitted with a housing.

JP 2006-36118 A

  If the upper end portions of the plurality of ventilation ducts are projected upward from the upper deck and the housing is provided on the upper deck so as to cover the upper ducts, the wind pressure resistance at the time of navigation of the ship will increase. The resistance applied to the hull when navigating the hull includes a frictional resistance acting between the bottom of the ship and seawater, a wave-forming resistance caused by navigation and movement of the hull, and a wind pressure resistance generated in the hull structure on the surface of the water. In particular, in the case of an automobile-only ship, the volume ratio and surface area of the structure on the surface of the water are extremely large compared to other ship types, so the influence of navigation resistance due to wind pressure resistance is large.

Although the required horsepower cruising increases if the wind pressure based on the wind pressure resistance occurs in the opposite direction to sailing direction of the hull, the magnitude F is F = ρCSV ^2/2. Even if the wind speed increases compared to the navigation speed of the hull against the water surface, the specific gravity ρ of air is about 1/800 that of seawater, and the wind pressure resistance is considered to be relatively small compared to the resistance below the water surface.

  However, when the wind pressure works in the transverse direction of the ship when the ship navigates under the crosswind, the ship moves in an oblique direction due to the resultant force of the propulsion force of the hull engine and the wind pressure of the transverse wind. This is said to be a skew. Normally, the shape of the hull below the surface of the water is designed assuming that the vehicle is going straight ahead. Therefore, when the hull is in a skewed state, the hull resistance is remarkably increased, and the fuel consumption is deteriorated accordingly. In this way, when the hull tilts due to crosswind, the navigation resistance under the water surface increases, so the influence of crosswind is not small. Therefore, if the wind pressure resistance due to the hull structure on the water surface can be reduced, the effect of improving the fuel efficiency is increased.

  As described in Patent Document 1, if notched portions are provided on both sides of the upper deck of the hull and the both sides of the upper deck are cut off, air separation can be prevented and navigation resistance of the hull can be reduced. The hull rotation moment about the vertical axis can be suppressed. However, if the upper end of each ventilation duct protrudes into the notch step and the upper end of the ventilation duct is covered by the housing, the housing for covering the ventilation duct protrudes at the corner cut portion of the upper deck. Therefore, navigation resistance is increased.

  An object of the present invention is to reduce the wind pressure applied to the hull and to reduce the fuel consumption of the engine that drives the hull.

An automobile ship according to the present invention is an automobile ship having a plurality of stages of loading decks on the hull, and having a plurality of floors that are partitioned in the vertical direction by the loading deck to accommodate vehicles, respectively. A common duct that is provided on the dredging side and communicates with a ventilation opening that opens to the outside of the ship is arranged in the longitudinal direction of the hull on the inside of the dredging side. A plurality of ventilation ducts having different lengths are connected to the common duct, a ventilation fan for generating an air flow is provided in the ventilation duct, and a plurality of ventilation ducts communicated by the common duct are provided via the ventilation openings. It is characterized by ventilating the inside of the hold of the floor at the same time .

In the automobile-dedicated ship of the present invention, a plurality of the common ducts are arranged in the hull while being shifted from each other in the vertical direction of the hull, and the plurality of ventilation holes having different vertical lengths from each other. A duct is connected, and the inside of the hold of a plurality of floors is ventilated simultaneously through the plurality of common ducts .

In the automobile-dedicated ship according to the present invention, the plurality of ventilation ducts extending to the hold above the hold where the common duct is disposed are connected to the common duct, and the common duct is disposed in the common duct. Rukoto be placed the common duct to the intermediate floor of the cargo hold of the plurality of the hold which the connecting a plurality of said ventilation duct extending in the hold of the lower floor than the hold, is ventilated simultaneously through the ventilation opening It is characterized by.

  The exclusive boat for automobiles according to the present invention is characterized in that the ventilation port is positioned on the upper side of the minimum freeboard and provided on the lower side. The automobile ship according to the present invention is provided with an open / close door at the ventilation opening provided below the minimum freeboard, and prevents water from entering the hull when the open / close door is closed. It is characterized by a watertight structure.

  According to the present invention, the ventilation port that opens to the outside of the ship is provided on the side of the hull, and the ventilation port and the ventilation port are communicated with each other via the ventilation duct provided with the ventilation port that opens in the hold. The end of the ventilation duct does not protrude upward from the upper deck. If the upper end of the ventilation duct protrudes from the upper deck, it must be covered with a structure. When such a structure is provided on the upper deck, wind pressure resistance is applied to the hull by the wind blown to the hull. However, since the ventilation port is provided on the shore side and the end of the ventilation duct does not protrude outside the ship, the wind pressure resistance applied to the hull can be reduced. Thereby, the fuel consumption of the engine for driving the hull can be reduced.

  According to the present invention, the ventilation port and the ventilation port are made to communicate with each other via the ventilation duct provided with the ventilation port on the shore side and the ventilation port opened in the hold, so that all the holds can be ventilated. The total length of the ventilation duct can be shortened. In particular, if a ventilation opening is provided on the intermediate floor, the total length of the ventilation duct can be shortened. Thereby, the space in the hold for accommodating a vehicle can be expanded.

(A) is sectional drawing which shows the starboard side of the motor vehicle special ship which is one embodiment of this invention, (B) is the 1B-1B sectional view taken on the line in (A). It is an expanded sectional view of 2 parts in Drawing 1 (A). FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is sectional drawing which shows the part similar to FIG. 2 in other embodiment of this invention. FIG. 5 is a sectional view taken along line 5-5 in FIG. (A) is an expanded sectional view of 6 parts shown in Drawing 1 (A) as other embodiments of the present invention, and (B) is a 6B-6B sectional view taken on the line in (A). (A) is the expanded sectional view of 7 parts shown by FIG. 1 (A) as other embodiment of this invention, (B) is the 7B-7B sectional view taken on the line in (A).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1 (A), this automobile-only ship advances forward in the right direction in FIG. 1 by means of a screw or propeller 21 provided at the stern of the hull 20, and at the stern to steer the navigation direction. A ladder or rudder 22 is provided. The propeller 21 is driven by an engine provided in the engine room 23.

  In the hull 20, 13-level car decks, that is, loading decks 1 to 13 are provided in layers from the lowest level to the highest level. Inside the hull 20, a vehicle storage room on the thirteenth floor for storing vehicles as cargo, that is, a cargo hold 24, is formed by being vertically partitioned by loading decks 1 to 13. In FIG. 1A, reference symbols a to m are given from the lowermost hold 24 to the uppermost hold 24. The uppermost loading deck 13 is also called a garage deck. The loading deck 13 is provided with a shielding structure 25 for covering a vehicle accommodated therein, and on the bow side of the loading deck 13 is a bridge. A bow structure 26 provided with a residential area is provided.

  In FIG. 1 (B), the fifth loading deck 5 from the bottom is shown on the stern side, and the seventh loading deck 7 is shown on the bow side. As shown in the drawing, a vehicle gate 27 is provided at the stern of the fifth deck, that is, the loading deck 5, and the vehicle is carried into each hold 24 at the quay or carried out from each hold 24 to the quay. In this case, a rampway (not shown) is passed over the vehicle gate 27. As an automobile-only ship, there are a type in which a vehicle gate is provided on one of the left and right sides of the hull, and a type in which the vehicle gate is provided on the bow side and the stern side. In order to guide vehicle travel between the vehicle gate 27 and each hold 24, a slope (not shown) is spanned between the loading decks in the hull 20. The car carrier shown in FIG. 1 is provided with 13 floors in a stack 24 for accommodating vehicles, but the number of floors is not limited to that shown in the figure. An automobile ship usually has about 10 floors.

  As shown in FIG. 1 (B), ventilation devices 30a are arranged on the inner sides of the left and right side sides 31 and 32 forming the side wall of the hull 20, respectively. As shown in FIG. 1, the ventilation device 30 a has a common duct 33 that extends in the longitudinal direction of the hull 20 inside the left and right sides 31 and 32 of the hold 24 g on the seventh floor from the bottom. . Each of the common ducts 33 communicates with a ventilation port 34 formed to open to the outside of the ship on the shore sides 31 and 32. 2 and 3, the common duct 33 has an upper side wall 35a, a lower side wall 35b, and left and right side walls 35c and 35d. The common duct 33 has a quadrangular cross section, and both front and rear end portions are partition walls 36. It is blocked by. Thereby, a communication chamber 37 communicating with the ventilation port 34 is formed inside the common duct 33.

  A louver 38 made of a plurality of strips extending in the horizontal direction is provided in the ventilation port 34 that allows the communication chamber 37 to communicate with the outside of the ship so that rainwater does not enter the communication chamber 37. As the louver 38 constituting the door member, there are a fixed type and a movable type. When the louver 38 is movable, the louver 38 becomes an open / close door that opens and closes the ventilation port 34. The louver 38 as an open / close door is opened when ventilating the inside of the cargo hold, and is closed when ventilation is not performed. The opening / closing operation of the movable louver 38 is automatically performed by an actuator (not shown). As an opening / closing door, you may make it use what consists of a single door member, without using a some louver.

  A plurality of ventilation ducts 41 are connected to the common duct 33. In the ventilation device 30a, a total of twelve ventilation ducts 41 are connected to the common duct 33 in the hull 20, and symbols a to m are attached to FIG. The shape of the ventilation duct 41 may be rectangular or circular in cross section. A ventilation duct 41h extending vertically upward through the upper loading deck is connected to the upper side wall 35a of the common duct 33 as shown in FIGS. 1 (A) and 2. A vent 42 that opens to the hold 24h is provided at the tip of the vent duct 41h. Similarly, vent ducts 41i to 41m that pass through the upper loading deck and extend vertically upward are connected to the upper side wall 35a. The ventilation ducts 41i to 41m each have a length such that the tip part reaches the hold 24i to 24m, and the ventilation ducts 41i to 41m are provided with a vent 42 that opens to the corresponding hold.

  As shown in FIGS. 1 (A) and 2, a ventilation duct 41f that penetrates the lower loading deck below the common duct 33 and extends vertically to the first floor lower hold 24f is connected to the lower wall 35b of the common duct 33. The ventilation duct 41f is provided with a ventilation opening 42 that opens to the hold 24f at the tip of the ventilation duct 41f. Similarly, ventilation ducts 41a to 41e that pass through the lower loading deck and extend vertically downward are connected to the lower side wall 35b. The ventilation ducts 41a to 41e have such lengths that their respective leading ends reach into the hold 24a to 24e, and the ventilation ducts 41a to 41e are provided with vent holes 42 that open to the corresponding hold 24. Yes.

  As shown in FIG. 3, a vent duct 41 g provided with a vent 42 that opens to the hold 24 g in which the common duct 33 is disposed is connected to the side wall 35 c of the common duct 33.

  Each ventilation duct 41 is provided with a ventilation fan 52 that is driven by a motor 51 to generate an airflow in the ventilation duct 41. By driving the ventilation fan 52, the air outside the ship taken in from the ventilation port 34 is introduced from the ventilation holes 42 into the respective holds 24 through the respective ventilation ducts 41. On the other hand, by reversing the ventilation fan 52, the air in each hold 24 is discharged from the ventilation port 34 to the outside of the ship through the ventilation duct 41.

  The common duct 33 of the ventilation device 30a is disposed in the hold 24g on the seventh floor from the bottom, and a ventilation port 34 is provided in the common duct 33. Therefore, the ventilation port 34 is provided just in the middle floor of the 13th floor hold 24, and ventilation to each hold 24 is concentrated from there. However, the vertical position of the hold where the common duct 33 is disposed is not limited to this floor, and if it is disposed in the range of about 3 to 4 floors above and below this floor, concentrated ventilation from the intermediate floor can be performed. .

  As described above, the ventilation port 34 is provided on the berth sides 31 and 32 of the hull 20, and the end portion of the ventilation duct 41 does not protrude upward from the upper deck as in the conventional case. It is not necessary to provide a structure such as a housing on the upper deck so as to cover the protruding end portion of the ventilation duct 41. Thereby, it becomes possible to reduce the wind pressure resistance applied to the hull 20 by the wind blown to the hull 20, and it becomes possible to reduce the fuel consumption of the engine for driving the hull. Moreover, if the upper end portion of the ventilation duct 41 arranged corresponding to each hold 24 is provided so as to protrude from the loading deck 13 which is the upper deck as in the prior art, the total length of all the ventilation ducts 41 can be increased. It must be long. On the other hand, in the ventilator 30a, the ventilation port 34 is provided in the central part in the vertical direction of the eaves 31 and 32, and the common duct 33 communicating therewith is provided at a position corresponding to the ventilation port 34. The total length of all the ventilation ducts 41 connected to the common duct 33 can be shortened. Thereby, the space for accommodating a vehicle in the hold 24 can be widened. Further, since the total length of the ventilation ducts 41 can be shortened, the airflow resistance of the entire ventilation ducts generated by all the ventilation fans 52 can be reduced, and electric energy for driving all the ventilation fans 52 can be reduced. Can be reduced.

  The ventilation duct described above is formed with a ventilation opening 42 that opens in the lateral direction of the hull 20 and a ventilation opening 42 that opens in the longitudinal direction of the hull 20. Either one of the ventilation openings 42 is used as a ventilation duct. You may make it provide.

  The common duct 33 and the ventilation ducts 41a to 41m constitute a pair of ventilation devices 30a, and the hull 20 is provided with symmetrical ventilation devices 30a symmetrically arranged on the left and right sides 31 and 32. Yes. Therefore, when the left and right ventilators 30a are driven so as to introduce the outside air and the other ventilator 30a is driven so as to exhaust the air in the hull, each hull 24 has a lateral direction with respect to the hull 20. A ventilation flow flows, and the inside of the hold 24 is ventilated. Also, a plurality of ventilation devices 30a shown in FIG. 2 and FIG. 3 are arranged on the respective sides 31 and 32 at intervals in the longitudinal direction of the hull 20 so that a ventilation flow is caused to flow in the longitudinal direction in the hold 24. Will be ventilated.

  FIG. 4 is a cross-sectional view showing the same part as FIG. 2 in another embodiment of the ventilator, and FIG. 5 is a cross-sectional view taken along line 5-5 of FIG.

  The ventilator 30b has a common duct 33 having the same structure as the common duct 33 of the ventilator 30a described above. As shown in FIG. 4, three ventilation ducts 41a to 41c are connected to the lower side wall 35b of the common duct 33, and three ventilation ducts 41h to 41j are connected to the upper side wall 35a. Each ventilation duct is provided with vent holes 42 for the second floor. For example, the ventilation duct 41j is formed with a ventilation opening 42 that opens to the uppermost hold 24m and a ventilation opening 42 that communicates with the lower hold 24l. Therefore, since the two-floor hold can be ventilated by one ventilation duct 41, the total length of all the ventilation ducts 41 can be made shorter than that of the ventilation device 30a.

  Even when this type of ventilation device 30 b is provided on the hull 20, it is preferable to provide the ventilation device 30 b symmetrically inside the left and right sides 31 and 32 of the hull 20. When a plurality of the ventilation devices 30b are arranged at intervals in the longitudinal direction of the hull 20, a ventilation flow can flow in the longitudinal direction in the hold. Further, the air vent 42 may be formed in one ventilation duct 41 so as to correspond to the third floor or higher floors. Further, the ventilation ducts 41 of the ventilation device 30a are each provided with a vent 42 that communicates with the first-floor hold, and the ventilation duct 41 of the ventilation device 30b is provided with a vent 42 that communicates with the second-floor hold. However, as the ventilation ducts 41 in the respective ventilation devices 30a and 30b, there are a ventilation duct 41 provided with a ventilation hole 42 communicating with the first floor hold and a ventilation opening 42 communicating with the second floor hold. The ventilation duct 41 provided may be mixed.

  FIG. 1A shows a ventilator 30c as another embodiment. The ventilation device 30c includes a common duct 33 disposed in the hold 24j and a common duct 33 disposed in the hold 24e. The lower common duct 33 is connected to a vent duct 41 having vent openings that open to the holds 24a to 24f, respectively, and the upper common duct 33 has a vent opening that opens to the holds 24g to 24m, respectively. 41 is connected. The structure of each ventilation duct 41 is the same as that of each ventilation duct 41 described above.

  When the common ducts 33 are provided at two positions apart from each other as in the ventilation device 30c, the ventilation ducts 41 are each ventilated in the hold 24 of the first floor, as is apparent from comparison with the ventilation device 30a. Even so, the total length of all the ventilation ducts can be made shorter than that of the ventilation device 30a.

  The common duct 33 of the ventilating device 30c is provided in the fifth-floor hold 24e and the tenth-floor hold 24j from the bottom, and is common to each intermediate floor of the hold 24 divided into upper and lower groups. A duct 33 is provided.

  The ventilators 30a to 30c each have a common duct 33. Depending on the layout of various devices and devices such as slopes provided in the hull 20, the above-described type of ventilators 30 a to 30 c may be mixed, or any one type of ventilator may be used. Will be provided. What type of ventilation device is used can be arbitrarily selected.

  FIG. 6 (A) is an enlarged cross-sectional view of 6 parts of the ventilator shown in FIG. 1 (A) as another embodiment of the present invention, and FIG. 6 (B) is 6B- in FIG. 6 (A). It is a 6B line sectional view.

  This ventilation device 30d has a ventilation duct 41 that passes through the laminated deck and extends between two adjacent vertical holds, and each of the ventilation ducts 41 has an opening at the inner ends of the upper and lower ends of the ventilation duct 41. A vent 42 is provided. A communication opening 53 is formed at the upper end of the ventilation duct 41 so as to face the ventilation port 34 formed on the heel side 32, and a ventilation fan 52 driven by a motor 51 is incorporated at the upper end. FIG. 6 shows a ventilator 30d having a ventilation duct 41 attached through the loading deck 13 up and down, and a ventilation device 30d having a ventilation duct 41 installed through the loading deck 11 up and down. However, the ventilator 30d provided in the hold on the other floor has the same structure.

  This type of ventilator 30d is designed to ventilate the upper and lower floors 24 by means of a single air duct 41. Compared to the case of the ventilators 30a to 30c described above, the total of all the air ducts is provided. The length can be shortened. Even when this type of ventilation device 30d is provided on the hull 20, it is preferable to provide the ventilation device 30d symmetrically inside the left and right sides 31 and 32 of the hull 20, but the ventilation duct 41 is short, so that it has been described above. The degree of freedom of arrangement is higher than that of the ventilation devices 30a to 30c, and the arrangement position of the ventilation device 30d may be different on each floor.

  The ventilation device 30d may be provided in the hull 20 in a mixed manner with the above-described ventilation devices 30a to 30c. Further, the air vent 42 may be formed in one ventilation duct 41 so as to correspond to the third floor or higher floors.

  FIG. 7A is an enlarged cross-sectional view of part 7 shown in FIG. 1A as another embodiment of the present invention, and FIG. 7B is a cross-sectional view taken along line 7B-7B in FIG. 7A. FIG.

  The ventilation device 30e has a ventilation duct 41 that communicates with a ventilation port 34 formed on the side 31 and 32 corresponding to each hold 24, and the ventilation duct 41 extends in the horizontal direction and is disposed in the hold 24. Yes. Thus, if the ventilation port 34 is formed corresponding to each floor, the opening area of the ventilation port 34 can be made smaller than when the common duct 33 is used.

  A ventilation device 30f shown in FIG. 1 is a modified example of the above-described ventilation device 30d, and has ventilation ducts 41 that open to ventilation ports 34 respectively formed in the hold 24g on the seventh floor from the bottom. Each of the ventilation ducts 41 has a different vertical length. Except for the central ventilation duct, three other ventilation ducts 41 arranged on both sides of the ventilation duct correspond to the upper and lower holds. Two vent holes 42 are provided. The basic structure of the central ventilation duct 41 is the same as that of the ventilation duct 41 shown in FIG. Further, the basic structure of the other ventilation duct 41 is the same as the ventilation duct shown in FIG. 6 except that the vertical length is different and two ventilation holes 42 are provided in each ventilation duct 41. It is the same. In this ventilator 30f, the vent holes 34 opened to all the vent ducts 41 are concentrated on the side corresponding to the hold 24f, but the positions of the vent holes 34 are shifted in the vertical direction. May be. In addition, although two ventilation holes 42 are formed in each ventilation duct 41, the ventilation holes 42 may be formed corresponding to one or more floors.

  The ventilation device 30f may be provided in the hull 20 in a mixed manner with the above-described ventilation devices 30a to 30e. However, since the ventilation port 34 cannot be provided below the water line of the hull 20, the ventilators 30 d and 30 e of the type not including the common duct 33 should be used for ventilation of the hold on the relatively upper floor side. become. On the other hand, for the hold below the water line, the ventilation devices 30a to 30c having the common duct 33 and the common duct are not provided, but the ventilation port 34 is concentrated on the hold 24g at the center in the vertical direction. It is preferable to use a ventilator 30f that is arranged.

  Even when the ventilation port 34 is provided above the water line, a louver or the like for opening and closing the ventilation port 34 is provided in the ventilation port 34 provided below the minimum freeboard stipulated by the international full water line convention. The open / close door made of is made into a watertight structure. As the watertight open / close door, a type of open / close door provided with a sealing material made of rubber or the like is used. Thus, the sealing material seals the ventilation port 34 when the open / close door is closed.

  FIG. 1A shows a hull 20 having five types of ventilation devices 30a, 30c, 30d, 30e, and 30f. This is for convenience of explanation, and FIG. 4 and FIG. Only one type of ventilator including the ventilator 30b shown may be provided, or any plural types of ventilators may be mixed and provided in the hull 20. In any of the ventilators, the ventilation port 34 is provided on the shore side 31 and 32, and the upper deck does not protrude from the upper end of the ventilation duct 41. Therefore, the wind applied to the hull 20 by the wind blown to the hull 20 The pressure resistance can be reduced, and the fuel consumption of the engine can be reduced. In addition, the entire length of the ventilation duct 41 for ventilating all the holds can be shortened, and the vehicle accommodation space in each hold 24 can be widened. Particularly, since the ventilation opening 34 is provided at the position of the intermediate floor among the plurality of floors, the upper and lower floors can be intensively ventilated from there.

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

1-13 Loading deck (car deck)
20 Hull 24 Ship holds 30a-30e Ventilation devices 31, 32 Side 33 Common duct 34 Ventilation port 37 Communication chamber 41 Ventilation duct 42 Ventilation port

Claims (5)

A vehicle-dedicated ship having a plurality of stages of loading decks on the hull and partitioned by the loading deck in the vertical direction and having a plurality of floors each holding a vehicle,
A common duct that is provided on the shore side of the hull and communicates with a ventilation opening that opens to the outside of the ship is disposed inside the shore side in the longitudinal direction of the hull,
A plurality of ventilation ducts each having a vent opening that opens in the hold and having different vertical lengths are connected to the common duct,
A ventilation fan for generating an air flow is provided in the ventilation duct,
An automobile-only ship characterized in that the inside of the hold on a plurality of floors is simultaneously ventilated by the plurality of ventilation ducts communicated by the common duct via the ventilation opening . 2. The automobile-only ship according to claim 1 , wherein a plurality of the common ducts are arranged in the hull while being shifted from each other in the vertical direction of the hull, and the plurality of common ducts having different vertical lengths. A dedicated automobile ship characterized in that the ventilation ducts are connected and the inside of the hold on a plurality of floors is simultaneously ventilated through the plurality of common ducts . 3. The automobile dedicated ship according to claim 1, wherein a plurality of the ventilation ducts extending to the hold on the upper floor than the hold where the common duct is disposed are connected to the common duct, and the common duct is connected to the common duct. A plurality of ventilation ducts extending to the hold below the hold where the ship is disposed, and the common duct is connected to the hold on the intermediate floor of the hold that is ventilated simultaneously through the ventilation port. placed to car carrier which is characterized in Rukoto. The car carrier according to any one of claims 1 to 3 , wherein the ventilation port is located on the upper side of the minimum freeboard and provided on the shore side. The motor vehicle ship according to any one of claims 1 to 3 , wherein an opening / closing door is provided at the ventilation opening provided below the minimum freeboard, and the opening / closing door is closed when the opening / closing door is closed. A vehicle-dedicated ship characterized by having a watertight structure that prevents water from entering the hull.

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