JPH0986479A - Bow part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify processing of a protrusion bow and to reduce a cost, in a bow part structure having the protrusion bow to reduce the occurrence of wave making resistance of a hull. SOLUTION: The shells 3 on both sides of a protrusion bow 2 are formed in a plate-form manner, and a knuckle 5 is formed at a joining part with a main hull 1. This constitution facilitates workmanship of the protrusion bow 2 itself and besides simplifies workmanship to join the protrusion bow 2 with the main hull 1, and remarkably reduces a processing cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bow structure, and more particularly to a bow structure having a protruding bow for reducing wave resistance.

[0002]

2. Description of the Related Art A conventional bow structure is shown in FIG. 5 (side view) and FIG. 6 (C-C sectional view of FIG. 5), in which the main hull is below the water surface 8 at the bow. A projecting bow 2 for reducing the wave-making resistance that projects forward from 1 is provided. In this example, at the front edge of the protruding bow 2, there is provided a linear portion 2c vertically formed from the upper end 2a to the lower end 2b.

[0003]

By the way, in the conventional bow structure as described above, the main hull 1 and the projecting bow 2 are joined by a smooth curve 2d, and the projecting bow 2 itself is also composed of a curved outer plate. Therefore, the outer plate 2 is composed of a thick steel plate having almost the same thickness as the outer plate of the main hull 1,
There is a problem in that it is difficult to work the protruding bow 2, resulting in a significant increase in cost. The present invention is intended to solve such a problem, and an object of the present invention is to provide a bow structure that simplifies the processing of the protruding bow and reduces the cost.

[0004]

In order to achieve the above-mentioned object, the bow structure of the present invention is provided with a projecting bow for reducing the wave-making resistance, which projects forward from the main hull below the water surface at the bow, The protruding bow is constructed so as to have flat plate-shaped outer shells extending from the front edge to the vicinity of the bow perpendicular to the rear, and the upper and lower joints between the rear edges of the outer shells and the main hull. It is characterized in that a knuckle extending in the direction is formed. In this way, when the projecting bow has the outer plates on both sides formed in a flat plate shape and the knuckle in the vertical direction is formed at the joint with the main hull, even if the outer plate is a thick plate, it projects due to a reduction in bending work. The work of the bow as a whole will be greatly simplified.

Further, in the bow structure of the present invention, the front edge portion of the projecting bow is constituted by a substantially partially cylindrical front wall plate extending vertically from its upper end to its lower end. The front edges of the outer plates on both sides are joined to the left and right rear edges. This allows most of the structure of the protruding bow to
Since it is composed of both side plate-shaped outer plates and a partially cylindrical front wall plate joined to the front edges of the both side plate, working of the protruding bow is further simplified.

Further, in the bow portion structure of the present invention, the bow portion is provided with a protruding bow for reducing the wave-making resistance that projects forward from the main hull below the water surface, and the thickness of the outer plate forming the protruding bow is reduced. In order to do so, a watertight partition for partitioning the inside of the protruding bow from the inside of the main hull is provided, and a large number of small holes are formed in the outer plate forming the protruding bow. In this way, when the inside of the projecting bow is partitioned from the inside of the main hull by a watertight partition wall and a large number of small holes are formed in the outer plate forming the projecting bow, the water pressure inside and outside the projecting bow will be Since the pressures become equal and the differential pressure does not become extremely large even in a sailing state, the plate thickness of the outer plate can be significantly reduced from the plate thickness of the outer plate of the main hull. Therefore, the work of constructing the protruding bow with the curved plate is facilitated, and the work of smoothly joining the protruding bow to the main hull is facilitated.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a bow structure as a first embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIGS. 3 and 4 show a bow structure as a second embodiment of the present invention, FIG. 3 is a side view thereof, and FIG. 4 is B of FIG. It is a -B sectional view.

First, the first embodiment of the present invention will be described. As shown in FIGS. 1 and 2, a projection for reducing wave-making resistance is projected forward from the main hull 1 below the water surface 8 at the bow portion. The bow 2 is provided, and the protruding bow 2 is
It is configured so as to have flat plate-shaped outer plates 3 extending from its front edge portion to the vicinity of the bow perpendicular FP at the rear,
The thickness of the outer plate 3 is substantially the same as the thickness of the outer plates of the adjacent main hulls 1.

A knuckle 5 extending in the vertical direction is formed at a joint between each rear edge of the outer shells 3 on both sides and the main hull 1. The front edge of the protruding bow 2 is composed of a substantially partially cylindrical front wall plate 4 extending from the upper end 2a to the lower end 2b as a vertical straight portion 2c. The front edges of both outer plates 3 are joined to the rear edge.

As described above, when the outer side plates 3 forming the majority of the protruding bow 2 are formed in a flat plate shape, the outer side plates 3 are the same.
Even if is composed of a thick steel plate similar to the adjacent outer skin of the main hull 1, the work of the protruding bow 2 as a whole is significantly simplified by a large reduction in three-dimensional bending,
Along with this, the construction cost will be reduced. Further, when the protruding bow front wall plate 4 joined to the front edges of the both side outer plates 3 is formed in a partially cylindrical shape, the processing of the protruding bow 2 is combined with the fact that both side outer plates 3 are formed in a flat plate shape. It will be even simpler.

Next, the structure of the bow portion according to the second embodiment of the present invention will be described. As shown in FIGS. 3 and 4, in the case of the present embodiment as well, the bow portion is mainly below the water surface 8. A projecting bow 2 for reducing the wave-making resistance that projects forward from the hull 1 is provided. Then, in order to reduce the thickness of the outer plate forming the protruding bow 2, the protruding bow 2
A watertight partition wall 6 for partitioning the inside of the ship from the inside of the main hull 1 is provided, and a large number of small holes 7 for allowing the inflow and outflow of seawater are freely formed in the outer plate (mainly the outer plates on both sides) forming the projecting bow 2. Has been formed.

As a result, the structural strength of the protruding bow 2 which has conventionally been required to withstand the buoyancy due to water pressure and the fluctuation of the buoyancy in waves can be relaxed, and the plate thickness of the steel material forming the protruding bow 2 can be reduced. Since it can be made thin, the number of steps required for bending the protruding bow 2 can be significantly reduced. In this way, when the protruding bow 2 is formed by using a relatively thin steel plate, the portion where the protruding bow 2 is joined to the main hull 1 is also smoothly faired on the curved surface 2d.
Since an outer plate having a can be used in a simple process, compared with the case where a knuckle 5 as shown in FIGS.
There is an advantage that resistance is not increased.

Further, in the case of the second embodiment, the structural strength of the projecting bow 2 is relaxed and is relatively small as compared with the conventional case, so in the event of a collision of the bow portion with the quay or the like. When raised, the projecting bow 2 is also damaged and deformed, absorbing collision energy and not damaging the main hull 1.

[0014]

As described in detail above, according to the bow structure of the present invention, the following effects can be obtained. (1) When the projecting bow has flat plates on both sides of the projecting shell and a knuckle is formed in the vertical direction at the joint with the main hull, even if the projecting bow is a thick plate, the projecting bow is reduced due to a reduction in bending work. The work as a whole is significantly simplified, resulting in a significant cost reduction. (2) Most of the structure of the protruding bow is a flat plate-like outer shell,
If it is configured with a partially cylindrical front wall plate joined to the front edges of the outer plates on both sides, the work of the protruding bow is further simplified. (3) When the inside of the projecting bow is partitioned from the inside of the main hull by a watertight partition and a large number of small holes are formed in the outer plate forming the projecting bow, the water pressure inside and outside the same shell is equal when the ship is stopped. Since the differential pressure does not become extremely large even in a sailing state, it becomes possible to significantly reduce the thickness of the outer plate than that of the main hull. Therefore, the work of constructing the protruding bow with a curved plate is facilitated, resulting in cost reduction, and the work of smoothly joining the protruding bow to the main hull is also facilitated, which has the advantage of not increasing the resistance. . (4) According to the above (3), the structural strength of the protruding bow is relaxed and becomes comparatively small, so in the event of a collision of the bow with the quay, etc., the protruding bow will be damaged and deformed. There is an advantage that it absorbs collision energy and does not damage the main hull.

[Brief description of drawings]

FIG. 1 is a side view showing a bow structure as a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a side view showing a bow structure as a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a side view showing an example of a conventional bow structure.

FIG. 6 is a sectional view taken along the line CC of FIG. 5;

[Explanation of symbols]

 1 main hull 2 projecting bow 2a projecting bow upper edge of leading edge 2b projecting bow leading edge lower end 2c straight portion 2d curved surface 3 both sides of projecting bow 4 front wall of projecting bow 5 knuckle 6 watertight bulkhead 7 small hole 8 water surface

Claims (3)

[Claims] 1. The bow comprises a wave-reducing resistance-reducing bow that projects forward from the main hull below the surface of the water, and the projecting bow extends from the front edge of the bow to the vicinity of the bow perpendicular to the rear. A bow structure constructed so as to have both side skins, in which a knuckle extending in the vertical direction is formed at a joint between each rear edge of the both side skins and the main hull. . 2. The bow structure according to claim 1,
The front edge of the protruding bow is composed of a substantially partially cylindrical front wall plate extending vertically from the upper end to the lower end, and the front edges of the both outer plates are formed on the left and right rear end edges of the front wall plate. The bow structure, which is characterized by being joined to each other. 3. The bow portion is provided with a projecting bow for reducing wave resistance that projects forward from the main hull below the water surface, and the inside of the projecting bow is reduced in order to reduce the thickness of the outer plate forming the projecting bow. A watertight partition for partitioning the inside of the main hull is provided, and a large number of small holes are formed in an outer plate forming the protruding bow, and a bow structure.