JPH11222179A - Bottom structure for high speed catamaran ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively relax the impact force of massive water concentrated onto a ship bottom part while being splashed by a center hull, and thereby prevent a ship from being damaged. SOLUTION: This invention is related to the bottom structure of a high speed catamaran provided with a center hull 5 at the bow side center part between a port demi hull 2A and a starboard demi hull 2B, which are provided for a port and a starboard hull, cushioning members 10 are provided for a cross deck 3a above a cushioning air apace 4 formed in a space among the center hull, and demi hulls 2A and 2B, in which the cushioning members are formed out of a plurality of divided air chambers 12 dividing the upper air space of the cushioning air space 4 by a plurality of partitioning plates 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom structure of a high-speed catamaran.

[0002]

2. Description of the Related Art As shown in FIG. 9, the bottom of a high-speed catamaran has a structure in which port and starboard hulls 1A and 1B are connected by a connecting portion 3, and is provided at the bottom of port and starboard hulls 1A and 1B. In the figure, Demihulls 2A and 2B are provided along the bow and tail direction, respectively. Further, in order to reduce the impact caused by contact with the sea surface HWL rising due to pitching or the like, air is blown between the inner walls of the curved left and right demil hulls 2A and 2B and the outer bottom plate (cross deck 3a) of the connecting portion 3. A buffer space 4 is formed to contain and utilize the compression effect. A wedge-shaped center hull 5 is provided at the bow bottom to improve drainage performance.

[0003]

However, the buffer space 4 effectively functions as a buffer against the sea surface uniformly rising due to pitching or the like. The impact of the splashed water mass cannot be mitigated, and the wave impact force concentrates on the connecting portion between the cross deck 3a and the inner walls of the demil hulls 2A and 2B, and particularly the cross deck 3a in rough sea areas. It is considered that there is a risk of causing fatigue and breakage.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and can effectively reduce the impact force of a body of water that is splashed off by a center hull and concentrated on the bottom of a ship, thereby preventing a breakage accident or the like. It is an object of the present invention to provide a bottom structure of a high-speed catamaran that can be used.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a high-speed dual hull in which a center hull is provided at the center on the bow side between a port side demil hull and a starboard demil hull provided at the bottom of the right and left hulls. In the bottom structure of a hull, a buffer member is provided on a bottom plate of a buffer space formed in a bottom portion between a center hull and a demil hull to divide the buffer space into a plurality and form a divided air chamber. Things.

According to the above configuration, the water mass bounced off by the center hull collides with the divided air chamber divided by the partition plate in the buffer space, and compresses the air in the divided air chamber to reduce its kinetic energy. It is possible to effectively reduce the impact force of the water mass that is absorbed and acts intensively on the bottom of the ship in the buffer space, thereby preventing damage to the bottom plate of the ship and the like.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the bottom structure of a high-speed catamaran according to the present invention will be described with reference to FIGS. The same members as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 1 to FIG.
A plurality of partition plates 11 that divide the upper part of the buffer space 4 into a plurality of portions in the direction of the ship's stern are provided on a cross deck 3a (ship bottom plate) that forms a buffer space 4 between the stern side and the demil hulls 2A and 2B. A cushioning member 10 is provided which protrudes in the direction and forms a plurality of divided air chambers 12 each having an open end along the bow and tail direction. The partitioning plate 11 has a plate-shaped cross section having a predetermined thickness, and has a length L from the rear end of the center hull 5 from the bow.
The length is set to L × １ ／ to １ ／ to the rear position by b. Here, L is the length of the hull on the waterline LWL during navigation, and Lb ／ L / 10. The height h of the partition plate 11 is, for example, 200 mm, and the interval W is 500 mm.

In the above configuration, in the buffer space 4, a plurality of divided air chambers 12 are formed in the side along the cross deck 3 a by the partition plate 11 in the direction of the side of the boat, so that the water mass splashed to the center hull 5 is formed. Even if it rises along the cross deck 3a, the air in the divided space 12 can be compressed and its kinetic energy can be effectively absorbed, its impact force is effectively attenuated, and the bottom outer plate of the cross deck 3a Will not damage.

As shown in FIG. 4, a partition plate 13 having a wedge-shaped cross section may be used instead of the partition plate 11 having a plate-shaped cross section.

FIGS. 5 to 8 show another embodiment. In the previous embodiment, the divided space 12 was opened in the bow-stern direction, whereas in this embodiment, only the bottom surface was provided. The divided air chambers 21 which are opened and independent of each other are formed.

That is, the cross deck 3a has, for example, four vertical partitioning plates 22 having a length = L × １ ／ to １ ／ from the forward end of the center hull 5 to a position slightly backward Lb from the bow. Cross deck 3a parallel to each other in bow direction
A plurality of horizontal partitioning plates 23 projecting from the vertical partitioning plate 22 at a predetermined interval in the bow and stern direction intersect with the vertical partitioning plate 22. Buffer members 20A and 20B having the chamber 21 are formed. Further, a bow horizontal partition plate 23a having a curved cross section is attached to the bow end of the vertical partition plate 22 for the purpose of minimizing the resistance of air and water mass flow, and a stern horizontal partition plate 23b is mounted to the aft end. I have.

By forming the cushioning members 20A and 20B in a lattice-shaped three-dimensional structure as described above, the strength of the partition plates 22 and 23 can be improved, and only the bottom surface is opened, the periphery is closed, and the divided air is independent. A chamber 21 is formed, whereby the effect of absorbing and damping kinetic energy due to the compression of air is greatly improved.

The partition plates 22 and 23 are arranged in a lattice shape in the bow and stern direction and in the side direction, but the present invention is not limited to this, and a honeycomb structure having a hexagonal shape in front view, a three-dimensional structure such as a triangle or a circle is used. You can also.

[0015]

As described above, according to the first aspect of the present invention, the water mass bounced off by the center hull collides with the divided air chamber divided by the partition plate in the buffer space, The kinetic energy is absorbed by compressing the air in the divided air chamber, and the impact force of the water mass concentrated on the bottom of the buffer space can be effectively mitigated to prevent damage to the outer shell of the bottom. be able to.

[Brief description of the drawings]

FIG. 1 is a transverse sectional view of a bow showing a high-speed catamaran according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a cross deck portion of the high-speed catamaran.

FIG. 3 is an overall side view of the high-speed catamaran.

FIG. 4 is an enlarged cross-sectional view of a cross deck portion showing a modified example of a partition plate of the high-speed catamaran.

FIG. 5 is an overall bottom view showing another embodiment of the high-speed catamaran according to the present invention.

FIG. 6 is a perspective view showing a bottom portion of the high-speed catamaran.

FIG. 7 is a side view showing a partition plate of the high-speed catamaran.

FIG. 8 is a bottom view showing a partition plate of the high-speed catamaran.

FIG. 9 is an enlarged cross-sectional view showing a cross deck portion of a conventional high-speed catamaran.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A, 1B Hull 2A, 2B Demil hull 3 Connecting part 3a Cross deck 4 Buffer space 5 Center hull 10 Buffer member 11 Partition plate 12 Split air chamber 20A, 20B Buffer member 21 Split air chamber 22 Vertical partition plate 23 Horizontal partition plate

Claims (3)

[Claims] 1. A bottom structure of a high-speed catamaran provided with a center hull in a center part on a bow side between a port side demil hull and a starboard demil hull provided at the bottom of the left and right hulls, wherein the center hull and the demil hull are provided. A bottom structure of a high-speed catamaran, characterized in that a buffer member for dividing the buffer space into a plurality of parts and forming a divided air chamber is provided on a bottom outer plate of the buffer space formed at the bottom of the ship. 2. The high-speed catamaran according to claim 1, wherein the shock-absorbing member is constituted by a partition plate arranged at least at a predetermined distance in a shipboard direction from a bottom outer shell at a shipboard side. Ship bottom structure. 3. The high-speed catamaran according to claim 1, wherein the shock-absorbing member is constituted by a plurality of partition plates forming a plurality of divided air chambers whose only sides are open and whose periphery is closed. Ship bottom structure.