JP6701487B2 - Landing ship, construction method of landing ship - Google Patents

Description

  The present invention relates to a landing ship and a method for constructing a landing ship, and more specifically, in a landing ship for landing by landing a landing portion of a bow part on a shore, even when the landing portion is damaged during landing and flooded, The present invention relates to a landing ship capable of keeping the inundation range small and a method of constructing a landing ship.

  Landing vessels such as landing boats and landing vessels are known as vessels that have the ability to land personnel and vehicles on the shore without relying on port facilities such as quays. This landing vessel lands (beaches) on the land of the coast from the bow side, and unloads crews and vehicles from the bow, etc., with the riding part of the bow portion riding on the shore or riverbank. .. Landing ships have a higher risk of damage to the landing area, as compared to general ships that do not land, because the outer skin of the landing area is in contact with the shore during landing.

  In a landing vessel, if the landing section is damaged and flooded, and the buoyancy on the bow side is greatly reduced, it will be difficult to leave the landing section on the coast and re-separate into the ocean. Even if it is possible to break off from the coast, if the inundation area on the bow side in the ocean expands, the bow trim becomes too large, resulting in a great hindrance to navigation. Therefore, in a landing ship, it is important to take measures to prevent damage to the riding part, but even if the riding part is damaged and flooded, it is very important to keep the inundation range small.

  In this regard, although not an invention relating to landing vessels, as a measure against inundation at the time of grounding, the inner bottom plate in the double bottom of the first cargo hold is more than the second cargo compartment adjacent to the rear of the first cargo. A ship installed at a high level has been proposed (see Patent Document 1). However, although this ship can protect the first cargo hold closest to the bow from inundation, no measures are taken at the bow. Therefore, when the bow portion is damaged, the entire bow portion is flooded and the buoyancy on the bow side is significantly reduced.

JP-A-8-133173

  The present invention has been made in view of the above situation, and in a landing ship that performs landing by riding the riding portion of the bow portion on the shore, even when the riding portion is damaged and the interior of the ship is flooded, its flooding range An object of the present invention is to provide a landing ship and a method for constructing the landing ship that can reduce the size of the landing ship.

A hoisting ship of the present invention for achieving the above-mentioned object is a landing ship that enters the coast from the bow side and hoists the landing portion of the bow portion on the coast, and the landing portion is provided inside the hull. And a watertight transverse bulkhead partitioning the inboard portion on the stern side of the riding section and a watertight bulkhead partition for partitioning the inboard portion of the riding section into at least two sections, and a bow valve is provided on the bow. However, as a watertight bulkhead for preventing water infiltration, a bulkhead valve bulkhead for partitioning the bow valve in a watertight manner is provided, and the position of the lower end of the bulkhead valve bulkhead that joins with the bottom material of the ship is a longitudinal cross-sectional view of the landing vessel at the hull centerline. According to the profile seen in the above, it is set in the range of 0.0m or more and 0.6m or less on the stern side with respect to the vertical line from the most stern side position on the front of the bow material, A watertight upper and lower partition bulkhead extending from the horizontal bulkhead to the bow valve bulkhead is provided on the bow side, and the position of the front end of the upper and lower partition bulkhead joined to the bow valve bulkhead is 0.6 m above the keel line. The range is set to 1.0 m or less, and the inboard portion of the riding section is divided into at least three sections by the partition for the bow valve and the upper and lower partitioning walls .

  According to this configuration, by providing a watertight transverse bulkhead inside the hull on the stern side of the riding portion, even if the riding portion is damaged and inundated, the watertight lateral bulkhead prevents the infiltration of water from the inboard portion of the riding portion. Can be prevented from spreading to the inner part of the ship on the stern side. Furthermore, by providing a watertight partition wall for preventing inundation that divides the interior of the riding part into at least two or more sections, even if the riding part is damaged, the inundation range of the inboard part of the riding part due to the damage can be kept small. You can This makes it possible to suppress a decrease in buoyancy on the bow side even when the riding portion is damaged.

In the above-mentioned hoisting ship, for example, a front end of the upper and lower partition bulkheads that are joined to the bow material are provided with watertight upper and lower partition bulkheads that extend from the watertight horizontal bulkhead to the bow material on the bow side as the watertight partition wall for water infiltration prevention. The position may be set to a range of 0.6 m or more and 1.0 m or less above the keel line (the horizontal line at the height position of the lower surface of the keel). With this configuration, even when the lower portion of the inboard portion of the riding portion is damaged and inundated, the upper and lower partition walls can prevent the infiltration of water to the upper portion of the inboard portion of the riding portion. Furthermore, the part that is relatively easily damaged during landing is less than 0.6m above the keel line, but the front end position of the upper and lower partition walls is set to 0.6m or above above the keel line. By doing so, it is possible to reduce the possibility that the damaged position will be above the upper and lower partition walls, and thus to reduce the risk that water will spread to the partition above the upper and lower partition walls. Furthermore, by setting the position of the front end of the upper and lower partitioning walls to a range of 1.0 m or less above the keel line, it is possible to reduce the flooding range in the section below the upper and lower partitioning walls.

In the unloading ship of the present invention, a bow valve is provided on the bow, and a bow valve bulkhead for partitioning the bow valve in a watertight manner is provided as the watertight partition wall for water infiltration prevention. The position is set in the range of 0.0m or more and 0.6m or less to the stern side with respect to the perpendicular line from the most stern side position on the front of the bow material in the profile of the landing ship in a longitudinal sectional view at the center line of the hull. It is configured to be.

  In other words, when the bow has a bow valve such as a spherical bow, the bow valve is a portion that is relatively easily damaged during landing. With this configuration, a bow valve partition wall that partitions the bow valve in a watertight manner is provided. Thus, even when the bow valve is damaged and infiltrated, it is possible to prevent the water from spreading to a section on the stern side of the bow valve partition wall, that is, to a rear portion of the riding portion inside the ship. Further, the position of the lower end of the partition wall for the bow valve, which is joined to the bottom material of the ship, is 0. By setting it in the range of 0 m or more and 0.6 m or less, it is possible to reliably prevent the infiltration of water due to the damage of the bow valve to the section on the stern side of the bow valve bulkhead, and to reduce the infiltration range of the damage to the bow valve. be able to.

Furthermore, as a watertight partition wall for preventing water infiltration , a watertight upper and lower partition partition wall extending from the watertight horizontal partition wall to the partition wall for the bow valve on the bow side is provided, and the position of the front end of the upper and lower partition partition wall to be joined with the partition wall for the bow valve is , The upper part of the riding section is divided into at least three or more sections by the partition for the bow valve and the partition walls for the upper and lower sides, which are set to a range of 0.6 m or more and 1.0 m or less above the keel line. The structure is divided . With this configuration, by dividing the riding portion into three or more sections by the upper and lower partitioning bulkheads and the partition wall for the bow valve, even if the riding portion is damaged, it is advantageous to suppress the inundation range due to the damage. .

The method for constructing a landing ship of the present invention to achieve the above object is to enter the shore from the bow side, in the method of constructing a landing ship for landing by riding on the shore of the bow part of the bow part, inside the hull, A watertight transverse bulkhead for partitioning the riding section and an inboard portion on the stern side of the riding section, and a watertight partition wall for preventing inundation that partitions the interior of the riding section into at least two sections, and a bow valve on the bow. Is provided, and as a watertight bulkhead for preventing inundation, a bulkhead valve bulkhead for partitioning the bow valve in a watertight manner is provided, and the position of the lower end of the bulkhead valve bulkhead joined to the bottom material of the ship is the longitudinal cross section of the landing vessel at the centerline of the hull. According to the profile viewed from the front, the range from 0.0m to 0.6m on the stern side with respect to the vertical line descending from the most stern side position on the front of the bow material is set, and the watertight lateral wall is used as the watertight bulkhead to prevent water infiltration. A watertight upper and lower partition bulkhead extending from the bulkhead to the bow valve bulkhead is provided, and the position of the front end of the upper and lower partition bulkhead joined to the bow valve bulkhead is 0.6 m or more above the keel line. It is set to a range of 1.0 m or less, and the inboard portion of the riding section is divided into at least three sections by the partition for the bow valve and the upper and lower partitioning walls .

  According to this method, by providing a watertight transverse bulkhead that divides the inboard portion on the stern side inside the hull of the riding portion, even if the riding portion is damaged and flooded, the watertight lateral bulkhead prevents the infiltration of water from the riding portion. Can be prevented from spreading to the inner part of the ship on the stern side. Furthermore, by providing a watertight partition wall for preventing inundation that divides the interior of the riding part into at least two or more sections, even if the riding part is damaged, the inundation range of the inboard part of the riding part due to the damage can be kept small. Will be possible. This makes it possible to suppress a decrease in buoyancy on the bow side even when the riding portion is damaged.

  According to the method of constructing a hoisting ship and a landing ship of the present invention, a watertight transverse bulkhead partitioning the hull into the stern side inside the hull of the landing section and a flooding partitioning the inboard part of the landing section into at least two sections. By providing the watertight partition wall for prevention, even when the riding portion that is in a state of riding on the coast at the time of landing is damaged and the inboard portion of the riding portion is flooded, the flooded range can be suppressed to be small.

It is explanatory drawing which shows typically the state which the landing ship of the 1st Embodiment which concerns on this invention landed on the shore by the longitudinal cross-sectional view in a ship centerline. FIG. 2 is an enlarged view of the vicinity of a riding portion of FIG. 1. It is explanatory drawing which shows typically the landing part vicinity of the landing ship of the 2nd Embodiment which concerns on this invention by the longitudinal cross-sectional view in a hull centerline. It is explanatory drawing which shows typically the landing part vicinity of the landing ship of the 3rd Embodiment which concerns on this invention by the longitudinal cross-sectional view in a ship centerline. It is explanatory drawing which shows typically the landing part vicinity of the landing ship of the 4th Embodiment which concerns on this invention by the longitudinal cross-sectional view in a ship centerline.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings, a landing ship and a method for constructing a landing ship.

The landing ship 1 of the first embodiment according to the present invention illustrated in FIGS. 1 and 2 enters the coast from the bow side, and the landing portion 3 of the bow portion rides on the coast to perform landing. The landing portion 3 is a bow portion that is supposed to land on the shore when the landing vessel 1 is landed. The range of the landing section 3 is appropriately determined depending on the size and hull form of the landing vessel 1, but specifically, for example, at the end portion on the bow side, the total length L _OA of the landing vessel 1 is 0 on the bow side. % And 20% or less, and more preferably 5% or more and 10% or less is set as the riding portion 3.

  As shown in FIG. 2, the landing vessel 1 includes a watertight transverse bulkhead 10 for partitioning the riding section 3 and the hull on the stern side of the riding section 3 inside the hull, and at least two or more inside of the riding section 3 A watertight partition 11 for preventing water from entering is divided into sections A1 and A2.

The watertight horizontal bulkhead 10 is arranged on the stern side of the riding portion 3. Specifically, the position of the lower end 10a of the watertight transverse bulkhead 10 that is joined to the ship bottom material 5 is set within the range of 5% to 20% of the total length L _OA of the landing ship 1 from the bow end 2 to the stern side, for example. It In this embodiment, a watertight transverse bulkhead 10 is provided so as to extend upward from the ship bottom material 5 to the upper deck 6. The watertight horizontal partition 10 is preferably erected vertically to the keel line KL (horizontal line at the height position of the lower surface of the keel), but the watertight horizontal partition 10 may be inclined with respect to the keel line KL. Good.

  The watertight partition wall 11 for preventing inundation is provided in the inboard portion of the riding section 3 divided by the watertight horizontal partition wall 10. In this embodiment, a watertight upper and lower partitioning partition wall 12 extending from the watertight lateral partition wall 10 to the bow member 4 on the bow side is provided as the watertight partition wall 11 for preventing inundation. The interior of the riding section 3 is divided into two sections A1 and A2 by the upper and lower partition walls 12. The position of the front end 12a of the upper and lower partition bulkheads 12 to be joined to the bow member 4 is set in the range of 0.6 m or more and 1.0 m or less above the keel line KL.

  In this embodiment, the upper and lower partition bulkheads 12 are arranged so as to extend parallel to the keel line KL, and the position of the rear end 12b of the upper and lower partition bulkheads 12 joined to the watertight horizontal bulkhead 10 is also relative to the keel line KL. It is set to a range of 0.6 m or more and 1.0 m or less above. The upper and lower partitioning walls 12 may be inclined with respect to the keel line KL, but the positions of the front end 12a and the rear end 12b of the upper and lower partitioning walls 12 are each 0.6 m or more above the keel line KL. The upper and lower partition walls 12 may be formed so as to have a range of 1.0 m or less.

  As described above, in the present invention, the watertight transverse bulkhead 10 is provided inside the hull of the landing vessel 1 on the stern side of the riding section 3 so that the inboard portions A1 and A2 of the riding section 3 and the stern side of the riding section 3 are provided. The inboard portion Aa is divided. Therefore, even when the riding portion 3 is damaged and flooded, the watertight lateral bulkhead 10 can prevent the flooding from spreading to the inboard portion Aa on the stern side of the riding portion 3.

  Further, by providing the watertight partition wall 11 for preventing inundation that divides the riding portion 3 into at least two sections A1 and A2, even when the riding portion 3 is damaged, the inboard portion A1 of the riding portion 3 due to the damage, The flooded range of A2 can be kept small. As a result, even if the riding portion 3 is damaged, it is possible to suppress a decrease in buoyancy on the bow side.

  As in this embodiment, when the watertight partition wall 11 is provided with the watertight horizontal partition wall 10 and the watertight upper and lower partition bulkheads 12 extending to the bow side, the riding portion 3 is damaged and the riding portion 3 Even when the lower portion A1 of the inboard portions A1 and A2 is inundated, the upper and lower partition walls 12 can prevent the inundation from spreading to the upper portion A2 of the inboard portions A1 and A2 of the riding portion 3.

  Further, the portion that is relatively easily damaged during landing is within a range of less than 0.6 m above the keel line KL, but the position of the front end 12a of the upper and lower partitioning wall 12 is set above the keel line KL by 0. By setting the length to 6 m or more, the possibility that the damaged position will be above the upper and lower partitioning walls 12 can be reduced, so that the risk of flooding spreading to the section A2 above the upper and lower partitioning walls 12 can be reduced. Further, by setting the position of the front end 12a of the upper and lower partitioning walls 12 in the range of 1.0 m or less above the keel line KL, the water immersion range in the section A1 lower than the upper and lower partitioning walls 12 is reduced. be able to.

  FIG. 3 shows a landing ship 1A according to a second embodiment of the present invention. This landing ship 1A has a bow valve 7 on the bow and is provided with a bow valve partition wall 13 for partitioning the bow valve 7 in a watertight manner as a watertight partition wall 11 for preventing inundation. In the landing vessel 1A, the interior of the riding section 3 is divided into two sections A3 and A4 by the partition 13 for the bow valve.

  The bow valve partition wall 13 of this embodiment includes a first wall portion 13a extending upward from the bottom material 5 and a first wall portion 13b which is bent toward the bow side with respect to the first wall portion 13a and extends to the bow material 4. It is composed of two walls 13b. The position of the lower end 13c of the partition wall 13 (first wall portion 13a) for the bow valve that joins with the bottom material 5 is the most stern side position on the front surface of the bow material in the profile of the landing vessel 1 as seen in a longitudinal sectional view at the hull centerline. It is set in a range of 0.0 m or more and 0.6 m or less on the stern side with respect to a perpendicular line from 4a, for example, a bow perpendicular line. The position of the front end 13d of the bow valve partition wall 13 (second wall portion 13b) to be joined to the bow material 4 is set in the range of 0.0m to 0.3m above the upper end 7a of the bow valve 7. There is.

  When the landing ship 1 has a bow valve 7 such as a spherical bow portion at the bow as in this embodiment, the bow valve 7 is a portion that is relatively easily damaged during landing, but the bow valve 7 is partitioned in a watertight manner. Even if the bow valve 7 is damaged and inundated by including the bow valve partition wall 13, the submerged section A3 is on the stern side of the bow valve partition wall 13, that is, the inboard portion A3 of the riding portion 3, It is possible to prevent the rear side portion A3 of A4 from spreading.

  Furthermore, the position of the lower end 13c of the partition wall 13 for the bow valve is 0.0m to the stern side with respect to the perpendicular line from the most stern side position 4a on the front of the bow material 4 in the profile seen in a longitudinal sectional view at the hull centerline. By setting the range to 0.6 m or less, it is possible to reliably prevent the infiltration of water due to the damage of the bow valve 7 to the section A3 on the stern side of the bow valve bulkhead 13, and the inundation range of the bow valve 7 for damage. Can be made smaller.

  The bow valve partition wall 13 may be configured to extend, for example, upward from the ship bottom material 5 to the upper deck 6. However, as in this embodiment, the bow valve partition wall 13 is provided above the ship bottom material 5. When the first wall portion 13a extending to the front wall portion and the second wall portion 13b that extends to the bow member 4 by bending to the bow side with respect to the first wall portion 13a are formed, the inundation range due to damage to the bow valve 7 It is advantageous to reduce the. Furthermore, if the position of the front end 13d of the partition wall 13 for the bow valve, which is joined to the bow material 4, is set to a range of 0.0m or more and 0.3m or less above the upper end 7a of the bow valve 7, damage to the bow valve 7 will occur. It is more and more advantageous to surely prevent the infiltration of water from spreading to the section A3 on the stern side of the bow valve partition wall 13 and to reduce the inundation range due to damage of the bow valve 7.

  FIG. 4 shows a landing ship 1B according to a third embodiment of the present invention. In addition to the configuration of the landing ship 1A of the second embodiment shown above, this landing ship 1B extends from the watertight lateral partition wall 10 to the bow side partition wall 13 for the bow valve as a watertight partition wall 11 for preventing water infiltration. A watertight upper and lower partition wall 12 is provided.

  The position of the front end 12a of the upper and lower partition bulkheads 12 joined to the bow valve bulkhead 13 is set to a range of 0.6 m or more and 1.0 m or less above the keel line KL. In the landing vessel 1B, the interior of the riding section 3 is divided into three sections A5, A6, and A7 by the bow valve bulkhead 13 and the upper and lower partition bulkheads 12.

  In this embodiment, the upper and lower partition bulkheads 12 are arranged so as to extend parallel to the keel line KL, and the position of the rear end 12b of the upper and lower partition bulkheads 12 joined to the watertight horizontal bulkhead 10 is also relative to the keel line KL. It is set in a range of 0.6 m or more and 1.0 m or less above. The upper and lower partition bulkheads 12 may be inclined with respect to the keel line KL, but the positions of the front end 12a and the rear end 12b of the upper and lower partition bulkheads 12 are each 0.6 m or more above the keel line KL. The upper and lower partition walls 12 may be formed so as to have a range of 1.0 m or less.

  When the riding section 3 is divided into three or more sections A5, A6, and A7 by the upper and lower partition bulkheads 12 and the bow valve bulkheads 13 as in this embodiment, the inundation caused by the damage of the bow valves 7 is prevented from occurring. Can be limited to the section A7 on the bow side, and water leakage due to damage to the lower portion of the riding portion 3 excluding the bow valve 7 is on the stern side of the bow valve bulkhead 13 and below the upper and lower partition bulkheads 12. It can remain in section A5. Therefore, even when the riding portion 3 is damaged, it becomes more and more advantageous to suppress the inundation range due to the damage.

  FIG. 5 shows a landing ship 1C according to a fourth embodiment of the present invention. This landing ship 1C is provided with an internal deck 8 (a hold) for loading vehicles and cargo inside the ship. In this embodiment, the watertight transverse bulkhead 10 is configured to extend upward from the ship bottom material 5 to the internal deck 8, and the bow valve bulkhead 13 is configured to extend upward from the ship bottom material 5 to the internal deck 8. .. When the inner deck 8 and the watertight vertical partition wall are provided between the ship bottom material 5 and the upper deck 6 in the vertical direction as in this embodiment, the watertight horizontal partition wall 10 and the bow valve partition wall 13 are attached to the ship bottom material 5. It is also possible to have a structure that extends from the upper side to the internal deck 8 or the vertical bulkhead.

  In this embodiment, a watertight horizontal bulkhead 14 is further provided to divide the sections A8 and A9 surrounded by the ship bottom 5, the watertight horizontal bulkhead 10, the upper and lower partition bulkheads 12 and the bow valve bulkhead 13 into two sections. ing. In the landing vessel 1C, the inboard portions A8, A9, A10, A11 below the internal deck 8 of the landing section 3 are divided into four sections A8, A9, A10 by the partition 13 for the bow valve, the upper and lower partition partitions 12, and the lateral partition. , A11.

  In this embodiment, a horizontal bulkhead 14 is provided so as to extend upward from the ship bottom material 5 to the upper and lower partition bulkheads 12. The position of the lower end 14a of the horizontal bulkhead 14 that is joined to the bottom material 5 is set between the watertight horizontal bulkhead 10 and the bow valve bulkhead 13 in the ship length direction. If the watertight partition wall 11 for preventing water infiltration that further partitions the sections A8, A9 partitioned by the partition wall 12 for upper and lower partitions and the partition wall 13 for the bow valve like this horizontal partition wall 14 is provided, even when the riding portion 3 is damaged, The inundation range due to the damage can be further reduced.

1, 1A, 1B, 1C Landing vessel 2 Bow end 3 Riding section 4 Bow material 4a Position on the most stern side in front of bow material 5 Bottom material 6 Upper deck 7 Bow valve 7a Upper end 8 Internal deck 10 Watertight Horizontal partition wall 10a (watertight horizontal partition wall) lower end 11 Watertight prevention watertight partition wall 12 Upper and lower partition partition wall 12a (upper and lower partition partition wall) front end 12b (upper and lower partition partition wall) rear end 13 Bow valve partition wall 13a First wall portion 13b Second Wall 13c Lower end 13d (of bulkhead valve bulkhead) Front end 14 Lateral bulkhead 14a (of horizontal bulkhead bulkhead) KL Keel line

Claims (2)

In a landing ship that enters the coast from the bow side and rides the riding part of the bow part on the coast to land.
Inside the hull, comprising a watertight transverse partition wall for partitioning the inboard portion of the stern side of the riding portion and the riding portion, a flood prevention watertight bulkhead for partitioning the inboard portion of the riding portion into at least two compartments ,
A bow valve is provided on the bow, and a bow valve bulkhead for watertightly partitioning the bow valve is provided as the watertight bulkhead for preventing water infiltration, and the position of the lower end of the bulkhead valve bulkhead joined to the bottom material of the ship is the hull. It is set in the range of 0.0m or more and 0.6m or less on the stern side with respect to the vertical line that descends from the most stern side position on the front of the bow material in the profile viewed from the longitudinal section at the center line,
Further comprises a watertight upper and lower partition bulkheads extending from the watertight lateral bulkhead to the bow valve bulkhead on the bow side as the watertight prevention watertight bulkhead, and the position of the front end of the upper and lower partition bulkheads joined to the bow valve bulkhead. It is set in a range of 0.6 m or more and 1.0 m or less above the keel line, and the inboard portion of the riding portion is divided into at least three or more sections by the partition for the bow valve and the upper and lower partitioning walls. A landing ship characterized by being In the method of constructing a landing ship that enters the coast from the bow side and rides the riding part of the bow part on the coast to land.
Inside the hull, a watertight transverse bulkhead for partitioning the riding part and an inboard portion on the stern side of the riding part, and a watertight bulkhead for preventing inundation partitioning the interior of the riding part into at least two or more partitions ,
A bow valve is installed on the bow, and a partition for the bow valve that water-tightly divides the bow valve is provided as the watertight partition for preventing water infiltration, and the position of the lower end of the partition for the bow valve that joins with the bottom material of the ship is the center of the landing ship. Set to a range of 0.0m or more and 0.6m or less on the stern side with respect to the vertical line that descends from the most stern side position on the front of the bow material in the profile viewed from the longitudinal section of the line,
Furthermore, as the watertight partition wall for preventing water infiltration, a watertight upper and lower partition partition wall extending from the watertight horizontal partition wall to the bow partition wall for the bow valve is provided on the bow side, and the position of the front end of the upper and lower partition partition wall to be joined with the partition wall for the bow valve, Setting to a range of 0.6 m or more and 1.0 m or less above the keel line, and dividing the inboard portion of the riding portion into at least three or more sections by the partition for the bow valve and the upper and lower partitioning partitions. A method of constructing a landing ship.

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