JP2018108797A - Landing ship, construction method for landing ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve lateral stability at the time of landing even when landing relatively shallowly in a single-body amphibious ship in which the bow portion is landed on the shore while ensuring propulsion performance and maneuvering performance. Provides amphibious ships and methods of building amphibious ships. SOLUTION: In a single-body amphibious ship 1 that enters the shore C from the bow 2 side and rides the bow portion on the shore C to land, a keel is attached to the bottom 3 of the landing ship that is in a state of being on the shore C at the time of landing. A ground contact portion 5 is provided at the same height as the line K or below the keel line K. The distance between the starboard side end portion 5a and the port side end portion 5b in the ship width direction of the ground contact portion 5 is set to be 20% or more and 90% or less of the maximum width B of the landing ship 1. [Selection diagram] Fig. 2

Description

  The present invention relates to a landing ship and a method for constructing a landing ship, and more specifically, in a single-body landing ship that performs landing by riding the bow portion on the coast while ensuring propulsion performance and maneuverability. The present invention relates to a landing ship that can improve lateral stability and a method for constructing a landing ship.

  Landing ships such as landing ships are known as ships that have the ability to land vehicles and personnel on the coast (the beach) without relying on harbor facilities such as quay walls. The landing ship is landed (beached) so as to ride on the coast from the bow side, and the crew and the mounted vehicle are landed from the bow with the bow on the coast.

  The landing ship includes a single-hull landing ship having one hull (hull) and two hulls, and a twin-hull landing ship capable of moving up and down the platform between the two hulls. Since this catamaran landing ship descends the platform and contacts the flat surface of this platform, it is possible to secure a large contact surface between the ship bottom and the coast during landing, and to ensure high lateral stability (for example, Patent Document 1). However, this twin-hull landing ship has a significantly more complicated structure than a single-hull landing ship, and it is difficult to secure the amount of drainage during navigation. There is a problem that the area becomes large.

  On the other hand, the conventional single-hull landing ship is easy to secure the amount of drainage, but the shape of the bottom of the bow portion tapers toward the center in the width direction in order to ensure the propulsion performance. . For this reason, it is difficult to ensure a large contact surface between the ship bottom and the sea bottom during landing. Therefore, in order to ensure sufficient lateral stability in the landing state, it is necessary to run deeply against the coast.

  However, if you ride deeply on the coast, it will be difficult to take off the landing ship that has landed, and a lot of time and labor will be required for the work. In order to cope with this problem, a drive plate that can be slid by a hydraulic cylinder is provided on the bow side, and the landing ship is taken off using a reaction force that presses the drive plate against the sandy beach and a thrust that moves the landing ship backward. A banking device has been proposed (see Patent Document 2).

  It is necessary to generate a sufficient reaction force in order to take off the landing ship in such a deep state, and it is necessary to equip the bow with a relatively large takeoff device. There will be a problem that such a rip-off device will be provided on the side, which may interfere with the entry and exit of vehicles and personnel.

JP 2008-515699 A JP 2002-114191 A

  The present invention has been made in view of the above situation, and in a single-body landing ship that climbs the bow portion on the coast and performs landing, of course, when ensuring a propulsion performance and a maneuvering performance, However, it is an object of the present invention to provide a landing ship and a method for constructing a landing ship that can improve the lateral stability at the time of landing even when boarding relatively shallowly.

  The landing ship according to the present invention for achieving the above-described object is a single-hull landing ship that enters the coast from the bow side and rides the bow portion on the coast to land on the coast when landing. A grounding part located at the same height as the keel line or below the keel line is provided at the bottom of the boarding ship to be in a state, and between the starboard side end part and the port side end part in the ship width direction of this grounding part The distance is 20% to 90% of the maximum width of the landing ship.

  According to this configuration, the landing ship bottom portion that rides on the coast when landing is provided with a ground contact portion, and the distance between the starboard side end portion and the port side end portion in the ship width direction of the ground contact portion is set to the maximum width of the landing ship. By setting the ratio to 20% or more, the lateral stability at the time of landing can be improved as compared with a conventional single-hull landing ship. As a result, it is not necessary to run deeply on the coast, so that the landing work and the offshore work can be performed more smoothly. Furthermore, by setting the distance between the starboard side end and the port side end in the ship width direction of the ground contact portion to 90% or less of the maximum width of the landing ship, the ground contact portion does not protrude outward on the ship side. Therefore, it is possible to reduce the risk that the grounding part contacts the quay or the like during navigation or berthing. More preferably, if the distance between the starboard side end and the port side end in the ship width direction of the grounding part is 50% or less of the maximum width of the landing ship, the hull shape and friction resistance are compared Therefore, it is advantageous to suppress a decrease in propulsion performance and steering performance during navigation.

  In the above-described collection vessel, when the grounding portion is constituted by a support leg portion that protrudes outward from a bottom plate that forms the landing bottom portion, the bottom portion of the landing boat is maintained in a state in which a conventional hull shape is maintained. It is possible to provide a grounding portion on the surface. Further, the support leg can be added not only to a newly built landing ship but also to an existing landing ship.

  In the above-mentioned lifting vessel, if the support leg is configured to have a streamlined shape, the frictional resistance and wave-making resistance due to the support leg can be further reduced. This is advantageous for suppressing a decrease in performance and steering performance.

  The above-mentioned lift ship may be configured to include a movable mechanism for projecting the support leg portion outward from the ship bottom skin plate and storing the support leg portion inside the ship bottom skin plate. By providing the movable mechanism, the support leg portion can be stored inside the ship bottom skin during navigation, so that the conventional hull shape can be maintained during navigation. Therefore, it is possible to improve the lateral stability at the time of landing while maintaining the propulsion performance and the steering performance at the time of navigation.

  In the above landing ship, when the grounding portion is constituted by a flat surface portion in which a part of a ship bottom outer plate constituting the boarding bottom portion is formed into a flat surface shape, the grounding portion at the time of landing and the coast Since it is possible to secure a large contact surface, it is advantageous for improving lateral stability during landing.

  The construction method of the landing ship to achieve the above-mentioned purpose is the state where the landing was carried out on the coast at the time of landing in the construction method of the single trunk landing ship that entered the coast from the bow side and climbed the bow part to the coast and landed A grounding part located at the same height as the keel line or below the keel line is provided on the bottom of the boarding ship, and the distance between the starboard side end and the port side end in the ship width direction of this grounding part Is set to 20% to 90% of the maximum width of the landing ship.

  According to this method, a grounding portion is provided at the bottom of a boarding ship that rides on the coast when landing, and the distance between the starboard side end and the port side end in the ship width direction of the grounding portion is set to the maximum width of the landing ship. By setting the ratio to 20% or more, a landing ship with improved lateral stability at the time of landing can be constructed as compared with a conventional single-hull landing ship. As a result, it is not necessary for the landing ship to run deeply on the shore, so the landing work and the berthing work can be performed more smoothly. Furthermore, by setting the distance between the starboard side end and the port side end in the ship width direction of the grounding part to 90% or less of the maximum width of the landing ship, the grounding part does not protrude outside the ship side. Therefore, it is possible to reduce the risk that the grounding portion contacts the quay or the like during navigation or berthing. More preferably, when the distance between the starboard side end portion and the port side end portion in the ship width direction of the ground contact portion is set to 50% or less of the maximum width of the landing ship, the hull shape has a frictional resistance or wave resistance. It can be maintained in a relatively small shape, which is advantageous for suppressing a decrease in propulsion performance and steering performance during navigation.

  According to the lifting device and the landing ship construction method of the present invention, a grounding portion is provided at the bottom of the landing ship, and the distance between the starboard side end and the port side end in the ship width direction of the grounding portion is determined as the landing ship. By setting the width to 20% or more and 90% or less of the maximum width, it is possible to improve the lateral stability at the time of landing while reducing the risk of the ground contact portion coming into contact with the quay or the like during navigation or berthing.

It is explanatory drawing which shows typically the state which the landing ship of 1st Embodiment concerning this invention landed in side view. It is explanatory drawing which shows typically the landing ship of FIG. 1 by a front view. It is explanatory drawing which shows typically the state which the landing ship of 2nd Embodiment which concerns on this invention landed by side view. It is explanatory drawing which shows typically the landing ship of FIG. 3 by a front view. It is explanatory drawing which shows typically the state which the landing ship of 3rd Embodiment which concerns on this invention landed by side view. It is explanatory drawing which shows typically the state which protruded the support leg part of the landing ship of FIG. 5 to the outer side of a ship bottom outer plate in front view. It is explanatory drawing which shows typically the state which accommodated the support leg part of the landing ship of FIG. 5 to the inner side of a ship bottom skin. It is explanatory drawing which shows typically the state which the landing ship of 4th Embodiment which concerns on this invention landed by side view. It is explanatory drawing which shows typically the state which protruded the support leg part of the landing ship of FIG. 8 to the outer side of a ship bottom outer plate with front view. It is explanatory drawing which shows typically the state which accommodated the support leg part of the landing ship of FIG. 8 to the inner side of a ship bottom skin. It is explanatory drawing which shows typically the landing ship of 5th Embodiment which concerns on this invention by a front view.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a landing ship and a construction method of a landing ship according to embodiments of the present invention will be described with reference to the drawings. 2, 4, 6, 7, and 9 to 11 schematically show the front view of the landing ship, and the alternate long and short dash line indicates the keel line K (at the height position of the lower surface of the keel). Horizontal line).

  The landing ship 1 of the first embodiment according to the present invention illustrated in FIGS. 1 to 2 enters the coast (beach) C from the bow 2 side, and rides the bow portion on the coast C to perform landing (beaching). It is a single-hull ship to perform. As shown in FIG. 1, the landing ship 1 has a ground contact portion located at the same height as the keel line K or below the keel line K on the landing ship bottom portion 3 that is in a state where it has been on the coast C when landing. 5 is provided.

The boarding ship bottom portion 3 is a ship bottom portion of the bow portion that is supposed to ride on the coast C when the landing ship 1 is landing. The range of the landing ship bottom 3 is appropriately determined depending on the size and hull form of the landing ship 1, and specifically, for example, 5% to 50% on the bow 2 side with respect to the total length _LOA of the landing ship 1 More preferably, the range of 5% to 20% is set as the boarding ship bottom portion 3.

  As shown in FIG. 2, the ground contact portion 5 of this embodiment is constituted by a support leg portion 6 that protrudes outward from the ship bottom outer plate 4 that constitutes the boarding ship bottom portion 3. The bottom shell plate 4 constituting the boarding bottom 3 has a shape in which the bottom of the bow portion tapers toward the center in the width direction as in the conventional hull shape. On the starboard side, support leg portions 6 projecting from the ship bottom outer plate 4 are provided.

  The support leg 6 of this embodiment is formed in a streamlined shape having a small frictional resistance and wave-forming resistance. More specifically, the support leg portion 6 is disposed so as to extend in the captain direction, and is tapered from the center portion in the captain direction toward the bow 2 side and the stern side. The support leg 6 protrudes obliquely downward from the hull center side toward the ship side in a front view, and has a shape that tapers from the root portion on the ship bottom skin 4 side toward the lower end. With regard to the arrangement of the support legs 6, it is desirable to provide the support legs 6 along the streamline of the water stream flowing along the hull in order to reduce resistance. Further, the joint portion between the ship bottom skin 4 and the support leg 6 is formed in a curved surface shape that is smoothly continuous with the streamline of the ship bottom skin 4 (hull). And the height position of the lower end part of the support leg part 6 in the ship length direction is set to the same height position as the keel line K.

In the landing ship 1 according to the present invention, the space between the starboard side end portion 5a and the starboard side end portion 5b in the ship width direction of the ground contact portion 5 located at the same height as the keel line K or below the keel line K is shown. Is set to 20% or more and 90% or less of the maximum width B of the landing ship 1, more preferably 20% or more and 50% or less. In this embodiment, the lower ends of the support legs 6 on both sides set at the same height as the keel line K constitute the grounding part 5 and the lower ends of the support legs 6 provided on the starboard side. Is the starboard side end portion 5a in the ship width direction of the ground contact portion 5, and the lower end portion of the support leg portion 6 provided on the port side is the port side end portion 5b in the ship width direction of the ground contact portion 5. In this embodiment, the bow-side end portion of the ground portion 5 in the Longitudinal is positioned in the range of 5% to 20% of the bow 2 side with respect to the total length L _OA of amphibious boat 1.

  In this embodiment, since the height position of the lower end portion of the support leg 6 is set to the same height position as the keel line K, the lower end portions of the support legs 6 on both sides are respectively connected to the grounding portion 5. The starboard side end 5a and the starboard side end 5b of the support leg 6 are provided. When the height position of the lower end of the support leg 6 is set below the keel line K, the support leg 6 The portion located at the same height as the keel line K and the portion located below the keel line K serve as the grounding portion 5. The most starboard side portion of the portion constituting the grounding portion 5 is the starboard side end portion 5 a of the grounding portion 5, and the most port side portion is the port side end portion 5 b of the grounding portion 5.

  In this way, in the present invention, the grounding portion 5 is provided on the landing ship bottom 3 that rides on the coast C when landing, so that the grounding portion 5 together with the ship bottom skin 4 with respect to the coast C when the landing ship 1 has landed. Is in a grounded state, or only the grounding portion 5 that is separated by floating the bottom shell plate 4 is in a grounded state. Therefore, the lateral stability at the time of landing can be improved as compared with the conventional single-hull landing ship 1. Furthermore, the distance W between the starboard side end portion 5a and the port side end portion 5b in the ship width direction of the ground contact portion 5 is set to be 20% or more of the maximum width B of the landing ship 1 so that it is shallow with respect to the coast C. Even when boarding, it is possible to ensure sufficient lateral stability during landing. Thereby, since it is not necessary to run deeply on the shore C, the landing work and the rip-off work can be performed more smoothly.

  Further, by setting the distance W between the starboard side end portion 5a and the port side end portion 5b in the ship width direction of the ground contact portion 5 to be 90% or less of the maximum width B of the landing ship 1, the ground contact portion 5 is located on the ship side. Since it does not protrude outward, it is possible to reduce the risk that the ground contact portion 5 contacts the quay or the like during navigation or berthing. More preferably, when the distance W between the starboard side end portion 5a and the port side end portion 5b in the ship width direction of the ground contact portion 5 is 50% or less of the maximum width B of the landing ship 1, the hull shape is reduced in friction resistance or The wave resistance can be maintained in a relatively small shape, which is advantageous for suppressing a decrease in propulsion performance and steering performance during navigation.

  If the grounding portion 5 is configured by the support leg portion 6 as in this embodiment, the grounding portion 5 can be provided on the boarding bottom portion 3 while maintaining the conventional hull shape. Therefore, the shape of the hull can be maintained in a shape with relatively small frictional resistance and wave-making resistance. Further, when the support leg 6 is formed in a streamline shape, the frictional resistance and wave-making resistance by the support leg 6 can be further reduced. Therefore, the propulsion at the time of navigation by providing the support leg 6 (the ground contact part 5). This is advantageous for suppressing a decrease in performance and steering performance. The support legs 6 can be added not only to a newly built landing ship 1 but also to an existing landing ship 1.

  In the case where the grounding portion 5 is configured by the supporting leg portion 6 fixed to the ship bottom portion 3 as in this embodiment, the height position of the lower end portion of the supporting leg portion 6 is the same height as the keel line K. It is good to set it. When the lower end portion of the support leg 6 is located below the keel line K, only the support leg 6 comes into contact with the coast C when riding on the coast C from the sea, Large impacts and loads may be applied. On the other hand, when the height position of the lower end portion of the support leg 6 is set to the same height as the keel line K, the ship bottom skin 4 and the support leg 6 are in contact with the coast C almost simultaneously. It can suppress more effectively that big load is applied to 6. FIG. Moreover, since the load of the landing ship 1 is dispersed and supported at the bottom of the ship and the lower end of the support leg 6 at the time of landing, the load applied to the support leg 6 is reduced, and the support leg 6 is damaged. It is advantageous to suppress.

Further, as in this embodiment, when the bow side end portion of the grounding portion 5 is located in the range of 5% to 20% on the bow 2 side with respect to the total length _LOA of the landing ship 1, the coast C On the other hand, as a matter of course, when riding deeply, sufficient lateral stability can be secured in a shallow riding state, which is advantageous for smoother landing work and berthing work.

In the landing ship 1 of the embodiment shown above, the configuration in which the bow side end of the ground contact portion 5 is located in the range of 5% to 20% on the bow 2 side with respect to the total length L _OA of the landing ship 1 is exemplified. However, as in the landing ship 1A according to the second embodiment of the present invention illustrated in FIGS. 3 and 4, the bow side end of the grounding portion 5 is on the bow 2 side with respect to the total length L _{OA of the} landing ship 1A. It is also possible to adopt a configuration located in the range of 20% to 50%.

Thus the landing ship 1A, when the structure is located in the range of 20% to 50% of the bow 2 side fore end of the grounding portion 5 with respect to the total length L _OA of landing ship 1A, landing previously shown Compared with the case where the support leg portion 6 that tends to be relatively large like the ship 1 is disposed in the vicinity of the bow 2, it is possible to configure the ground contact portion 5 having a large degree of stability with the smaller support leg portion 6. Therefore, the frictional resistance and wave-making resistance due to the support leg 6 can be further reduced, and thus the deterioration of propulsion performance and steering performance during navigation due to the provision of the support leg 6 (grounding part 5) is suppressed. Is advantageous.

  5 to 7 show a landing ship 1B according to a third embodiment of the present invention. The landing ship 1 </ b> B includes a movable mechanism 7 that projects the support leg 6 outward from the bottom shell plate 4 and stores the support leg 6 inside the bottom plate 4.

  As shown in FIGS. 5 and 6, the support leg portion 6 of this embodiment has a telescopic structure in which a plurality of elongated elliptical divided bodies are connected to be relatively movable. The movable mechanism 7 is composed of an expansion / contraction mechanism 7 a that expands and contracts the support leg 6. The bottom shell plate 4 constituting the boarding bottom 3 has a shape in which the bottom of the bow 2 is tapered toward the center in the width direction, like a conventional hull shape. A support leg 6 and an expansion / contraction mechanism 7a are built in a part of the side and starboard side, respectively. The support leg portion 6 is configured to extend obliquely downward from the center of the hull from the center of the hull toward the ship side by a telescopic mechanism 7a.

  In the landing ship 1B, the lower end portion of the support leg 6 is at the same height as the keel line K or from the keel line K by extending the support leg 6 so as to protrude outward from the bottom shell outer plate 4 by the expansion / contraction mechanism 7a. Can be set to the lower position. Then, the starboard side in the ship width direction of the ground contact portion 5 is extended with the support leg portion 6 having the lower end portion of the support leg portion 6 set at the same height as the keel line K or a position below the keel line K extended. The distance W between the side end portion 5a and the port side end portion 5b is configured to be 20% or more and 90% or less of the maximum width B of the landing ship 1B. The height position of the lower end portion of the support leg 6 can be adjusted to an arbitrary height position by changing the length by which the support leg 6 is extended by the expansion / contraction mechanism 7a. As shown in FIG. 7, when the support leg portion 6 is contracted by the expansion / contraction mechanism 7 a, the support leg portion 6 is accommodated inside the ship bottom outer plate 4.

  If the support leg portion 6 is provided with the movable mechanism 7 as in this embodiment, the support leg portion 6 can be stored inside the ship bottom skin 4, so that the conventional hull shape can be used during navigation. Can be maintained. Thereby, it is possible to improve the lateral stability at the time of landing while maintaining the propulsion performance and the maneuvering performance at the time of navigation.

  In addition, by providing the movable mechanism 7, when riding on the coast C from the sea, the support leg 6 is stored inside the ship bottom skin 4, and after landing on the coast C, the support leg 6 is outside the ship bottom. It is also possible to project outward from the plate 4. If it does in this way, since the impact force at the time of riding on the shore C will not be applied to the support leg part 6, it will become advantageous in reducing the risk that the support leg part 6 will be damaged. In addition, when leaving the sea from the state of landing on the coast C, the ground contact area between the coast C and the landing ship 1B can be reduced by placing the support legs 6 inside the ship bottom skin 4. As a result, the berthing work can be carried out in a more circular shape.

  Moreover, if it is made the structure which can change arbitrarily the height position of the lower end part of the support leg part 6 with the movable mechanism 7 like this embodiment, after landing on the coast C, it matches with the shape and surface state of the coast C. Thus, the height position of the lower end portion of the support leg 6 can be adjusted as appropriate, which is advantageous for improving the lateral stability during landing and the function of correcting the lateral inclination (heel). Specifically, for example, even when the shape of the shore C on board is not flat, the height position of the lower ends of the support legs 6 on both sides is adjusted to the shape of the shore C to adjust the height at the time of landing. In addition to the stability, it is possible to further improve the function of reducing the lateral inclination.

  The support leg 6 and the movable mechanism 7 can also be configured like the landing ship 1C of the fourth embodiment according to the present invention shown in FIGS.

  As shown in FIGS. 8 and 9, the support leg 6 of this embodiment is formed of a plate-like member. The movable mechanism 7 is composed of a movable hinge portion 7b provided on the boarding ship bottom portion 3. The movable hinge portion 7b is composed of, for example, a rotating hydraulic cylinder, a rotating air cylinder, a hydraulic motor, an electric motor, or the like. The rear end portion of the support leg portion 6 is rotatably connected to the movable hinge portion 7b. The front end portion of the support leg 6 is formed in a curved surface shape having a short cross-sectional shape of a substantially arc shape.

  As shown in FIG. 9, the lower end of the support leg 6 is at the same height as the keel line K by rotating the support leg 6 diagonally downward from the center of the hull to the ship side as viewed from the front by the movable hinge part 7b. The sheath can be set at a position below the keel line K. Then, with the lower end of the support leg 6 set to the same height as the keel line K or a position below the keel line K, the starboard side end 5a and the port side end in the ship width direction of the grounding unit 5 The distance W to the portion 5b is configured to be 20% or more and 90% or less of the maximum width B of the landing ship 1C.

  The height position of the lower end portion of the support leg portion 6 can be adjusted to an arbitrary height position by changing the rotation angle of the support leg portion 6 by the rotation hinge portion. As shown in FIG. 10, a storage groove 8 that can store the movable hinge portion 7b and the support leg portion 6 is formed in a part of the bottom shell outer plate 4, and the support leg portion 6 is arranged along the ship bottom. Then, the support leg 6 is accommodated inside the ship bottom skin 4. Even in the case where the movable mechanism 7 is configured by the movable hinge portion 7b and the support leg portion 6 is rotated as in this embodiment, the landing ship 1B of the third embodiment described above and Similar effects can be obtained.

  In the above first to fourth embodiments, the case where the ground contact portion 5 is constituted by the support legs 6 is exemplified. However, like the landing ship 1D of the fifth embodiment according to the present invention shown in FIG. Moreover, the ground contact portion 5 can also be constituted by a flat surface portion 9 in which a part of the ship bottom outer plate 4 constituting the boarding ship bottom portion 3 is formed in a flat surface shape.

  In this landing ship 1D, a part of the bottom shell 4 is composed of a flat surface portion 9 positioned at the same height as the keel line K. The starboard side end portion 5a and the port side of the flat surface portion 9 in the ship width direction are formed. The distance W between the ends 5b is set to 20% or more and 90% or less of the maximum width B of the landing ship 1D. The portion of the ship bottom outer plate 4 other than the flat surface portion 9 is formed in a streamlined shape with low frictional resistance and wave-forming resistance.

  As in this embodiment, when the ground contact portion 5 is constituted by the flat surface portion 9 in which a part of the ship bottom skin 4 is formed into a flat surface shape, a large ground contact surface between the ground contact portion 5 and the coast C when landing is secured. This is advantageous in improving the lateral stability during landing.

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C, 1D Landing ship 2 Bow 3 Riding ship bottom part 4 Ship bottom skin 5 Grounding part 5a Starboard side edge part 5b (of grounding part) Port side edge part 6 Support leg part 7 Movable Mechanism 7a Telescopic mechanism 7b Movable hinge 8 Storage groove 9 Flat surface C Coast K Keel line

Claims (6)

In a single trunk landing ship that enters the coast from the bow side and climbs the bow part to the coast to land
At the bottom of the boarding ship that will be on the coast when landing, a grounding part located at the same height as the keel line or below the keel line is provided, and the starboard side end part in the ship width direction of this grounding part A landing ship characterized in that the distance between the port and the port side end is 20% or more and 90% or less of the maximum width of the landing ship.   The landing ship according to claim 1, wherein the ground contact portion is configured by a support leg portion that protrudes outward from a ship bottom skin plate that constitutes the boarding ship bottom portion.   The landing ship according to claim 2, wherein the support leg has a streamlined shape.   The landing ship according to claim 2, further comprising a movable mechanism for projecting the support leg portion outward from the ship bottom skin plate and storing the support leg portion inside the ship bottom skin plate.   The landing ship according to claim 1, wherein the grounding portion is constituted by a flat surface portion in which a part of a ship bottom outer plate constituting the boarding ship bottom portion is formed in a flat surface shape. In the construction method of a single trunk landing ship that enters the coast from the bow side, and climbs the bow part to the coast to land.
At the bottom of the boarding ship that will be on the coast when landing, a grounding part located at the same height as the keel line or below the keel line will be provided, and the starboard side end and port side in the ship width direction of this grounding part A method for constructing a landing ship, characterized in that the distance between the ends is set to 20% to 90% of the maximum width of the landing ship.

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