JP2000280974A - Bow structure of ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the bow structure of a ship which can manufacture the bow part projecting to the front side from the bow vertical line, by a simple combination of tube surfaces. SOLUTION: This bow structure is formed by projecting the bow part 4 projecting to the front side of a bow vertical line, to cross tube surfaces with a specific cross section form respectively at the hull center surface at the front side of the bow vertical line, from the left and the right sides of the bow. And by composing by providing a tubular projection 4 the width direction is narrowed as going to the bow front side, and a curved surface connecting the crossing parts of the tube surfaces smoothly, the manufacture of the bow part which has been considered difficult formerly is made possible to carry out easily, in a simple combination of curved surfaces to project the simple form of tube surfaces, not to be a complicated free curved surface, to the front side of the bow vertical line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bow structure of a ship having a bow portion projecting forward from a vertical line below the bow of the ship.

[0002]

2. Description of the Related Art In a ship, as shown in FIGS. 10 (a) and 10 (b), in order to reduce wave-making resistance when sailing on the water surface, a bow portion a is provided below a full load draft line b. The formation of a bow portion projecting forward from the bow perpendicular c is performed.

Conventionally, such a bow portion has a structure in which a free-form surface is combined to form a protruding portion d having a complicated free-form surface as shown in FIGS.

[0004]

However, such a protruding portion d of the bow portion is formed with a complicated free-form surface.

[0005] For this reason, the production of the protruding portion d requires laborious operations such as performing different bending processes or performing different assembly processes on the workpiece in accordance with a complicated free-form surface. In addition, it is difficult to automate the processing because a complicated free-form surface is formed, and this poor workability has led to an increase in ship building costs.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bow structure of a ship capable of manufacturing a bow portion protruding forward from a bow perpendicular by simply combining simple curved surfaces. Is to do.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a bow portion projecting forward from a vertical line of a bow has a cylindrical surface having a predetermined cross-sectional shape from each of the right and left sides of the bow. It is configured to have a protruding portion formed so as to protrude in the direction intersecting with the center plane of the hull in front of the bow and narrowing in the forward direction, and a curved surface for smoothly connecting the intersecting portion of the respective cylinder surfaces.

[0008] In addition to the above object, the invention described in claim 2 provides the projecting portion of claim 1 with a pair of the same radius from both the left and right sides of the bow, so that the bow can be manufactured more rationally. The structure is such that the cylindrical surface protrudes forward of the bow perpendicular to the direction crossing the hull center plane.

In addition to the above-mentioned object, the invention according to claim 3 further includes the projecting portion of claim 1 which is formed from both the left and right sides of the bow so that a bow having an appropriate outer shape can be manufactured according to the type of ship. A pair of cylindrical surfaces having different radii on the upper side and the lower side, respectively, are formed so as to protrude forward of the bow in a direction intersecting with the center plane of the hull.

According to a fourth aspect of the present invention, in addition to the above object, the projecting portion of the first aspect further comprises a cylindrical surface other than a pair of cylindrical surfaces formed by quadratic curved surfaces from both the left and right sides of the bow. The structure is formed so as to protrude forward of the bow perpendicular to the direction intersecting with the center plane of the hull.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on a first embodiment shown in FIGS.

FIG. 1 is a side view of the bow side of a ship, wherein 1 is a hull, and 2 is a bow portion of the hull 1.

A bow portion 4 is formed below the full water draft line L of the bow portion 2 so as to protrude forward from a bow perpendicular H. The present invention is applied to the bow portion 4.

To explain the bow part 4, reference numeral 4 in the figure is a projection. The projecting portion 4 has a structure in which a cylindrical surface having a predetermined cross-sectional shape is projected from the left and right sides of the bow in a direction intersecting in front of the bow perpendicular. This structure forms most of the outer surface of the bow portion 4.

That is, for example, the projecting portion 4 is a plan sectional view of the hull 1 shown in FIG. 2 (a view taken in the direction of arrows II-II in FIG. 1), and FIG.
As shown in the front sectional view of the hull 1 shown in FIG. 1 (view taken along the line III-III in FIG. 1), the hull center line α (the center in the width direction of the hull 1)
A part of a cylindrical surface, for example, two (one pair) of right and left cylindrical walls 4a and 4b having the same radius, is formed in front of the bow perpendicular to the hull center plane (hull center line α of each height) 1 in the width direction center plane). Specifically, the protruding portion 4 is formed by protruding the radially outer wall portions of the left and right cylindrical walls 4a and 4b forward of the bow so as to intersect with the center plane of the hull. More specifically, as shown in FIG. 2, the port side cylindrical wall 4a is, for example, an outer wall portion of a cylindrical surface whose center line 7a is a line substantially parallel to the port side curved surface 6a transitioning from the hull parallel portion to the bow perpendicular H. Formed by
The cylindrical wall 4b on the starboard side is formed symmetrically with an outer wall of a cylindrical surface having a center line 7b that is substantially parallel to the curved surface 6b on the starboard that transitions from the hull parallel part to the bow perpendicular H, for example. The radius r of each cylindrical surface is the same. Then, the outer wall portions on the left and right sides are joined (intersecting) to form an outer surface that projects forward in the vertical direction of the bow while gradually narrowing in the width direction toward the front, thereby forming the protrusion 4. In addition,
In FIG. 2, reference numerals 8a and 8b denote bus lines outside the cylinder centered on the respective center lines 7a and 7b, and reference numerals 9a and 9b denote bus lines (virtual) inside the cylinder centered on the center lines 7a and 7b.

Most of the outer surface of the bow portion 4 is constituted by a structure in which a part of the two right and left cylindrical surfaces intersecting at the front end is combined. As can be seen from this point, if a cross section perpendicular to the center lines 7a and 7b in FIG. 2 (cross section along the line AOB in FIG. 2) is shown in FIG. 4, the left and right cylindrical walls 4a and 4a in FIG.
It will be appreciated from the combination of the outer walls of 4b that it forms most of the outer surface of the bow portion 4.

The intersections of the front ends of the left and right cylindrical walls 4a, 4b are connected so as to be continuous with a smooth curve.

The rear ends of the left and right cylindrical walls 4a, 4b are both curved surfaces 6a, 6 which transition from the hull parallel part to the bow perpendicular H.
b is connected smoothly. Note that 12a, 1 in FIG.
2b indicates an extension of the cylindrical bus in the vertical direction of the cylindrical walls 4a, 4b.

In a structure in which a pair of cylinder surfaces having a predetermined cross-sectional shape are protruded from both sides of the bow so that the front ends thereof intersect at the center plane of the hull ahead of the vertical line of the bow, the bow portion 4 is constituted. Instead of a complicated free-form surface as in the related art, a cylindrical surface having a predetermined cross-sectional shape specified in advance, that is, a cylindrical surface having a simple shape can be formed by protruding forward of the bow. That is, the bow portion 4 protruding forward from the bow perpendicular can be manufactured by a simple combination of curved surfaces.

Therefore, bending and assembling of the work required for manufacturing the protruding portion 4 become easy. In addition, since the processing provides regularity, automation is facilitated, the production of the bow part 4 can be rationally advanced, and the construction cost of the ship can be reduced. In addition, a structure in which a pair of cylindrical surfaces having the same radius protrude from both sides of the bow so as to intersect with the center plane of the hull in front of the bow perpendicular to form the bow 3 makes bending and assembly of the work simpler. Thus, more efficient automation can be promoted, and the manufacture of the bow portion 4 can be proceeded more rationally, and the construction cost of the ship can be further reduced.

FIG. 5 shows a second embodiment of the present invention.

In the present embodiment, the projecting portion 4 is not formed by combining a pair of cylindrical surfaces as in the first embodiment, but by cylindrical walls 4a and 4b formed with different radii on the upper side and the lower side, respectively.
An example is shown using a cylindrical surface (both sides).

That is, FIG. 5A shows a common radius r1.
The upper part of the cylindrical walls 4a, 4b (left and right) is formed by the upper part, and the lower part of the cylindrical walls 4a, 4b (left and right) is formed by the radius r2 having a value larger than the same radius r1. 4 shows an example of the structure of FIG.

FIG. 5 (b) shows the upper surface of each of the cylindrical walls 4a, 4b (left and right) formed with a radius r3, respectively, and the cylindrical walls 4a, 4a, 4b with a radius r4 larger than the radius r3.
4b (left and right) bow part 4 forming each lower cylindrical surface
2 shows an example of the structure.

FIG. 5C shows the position of the joint of the upper and lower circular arcs on each of the cylindrical walls 4a and 4b shown in FIG.
The structure changed to 4a and 14b is shown.

FIGS. 5A to 5C all show cross sections corresponding to the portion along the line AOB in FIG. However, each of O1 to O4 indicates the center position of each of the radii r1 to r4.

With such a structure in which the projecting portion 4 is formed by a pair of cylindrical surfaces having different radii on the upper side and the lower side, depending on how the radius is set, a fattening ship such as a tanker or a thin type such as a container ship can be used. A more suitable bow shape can be formed according to the type of ship such as a ship, and the effect of reducing wave-making resistance can be further improved.

FIGS. 6 to 9 show a third embodiment of the present invention.

This embodiment is a modification of the second embodiment, in which the cylindrical walls 4a and 4b are formed, for example, on a cylindrical surface other than a cylindrical surface (a quadratic curved surface which can be developed on a plane) suitable for reducing wave-making resistance. It is what it was.

Specifically, as shown in FIG. 9, for example, the cross section of the left and right cylindrical walls 4a and 4b corresponding to the portion along the line AOB in FIG. 2 is formed by a substantially inverted water-drop-shaped cylindrical surface. Thus, a curved surface that can be developed into a plane is used.

FIG. 6 is a side view of a boat 1 having a bow portion 4 adopting a cylindrical surface other than this cylinder. FIG. 7 is a plan sectional view of the hull 1 (the VII-VII arrow in FIG. 6). FIG. 8 is a front sectional view of the hull 1 (a view taken in the direction of arrows VIII-VIII in FIG. 6).

When such a quadratic curved surface is adopted,
By setting the quadric surface, a more appropriate bow shape can be formed according to the type of ship than in the second embodiment,
Further, the effect of reducing wave making resistance can be further improved.

6 to 9, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
However, the curved surface 6 which transitions from the hull parallel part to the bow perpendicular H
a, 6b and the rear ends of the quadratic curved cylindrical walls 4a, 4b are shown in FIG.
Instead of touching like
a and 15b are connected by a smooth curved surface.

[0034]

As described above, according to the bow structure of the present invention, most of the bow portion is not a complicated free-form surface as in the prior art, but a cylindrical surface having a predetermined cross-sectional shape, that is, a simple-shaped cylindrical surface. Can be formed by projecting forward of the bow normal, and a bow portion projecting forward from the bow normal can be manufactured by a combination of simple curved surfaces.

Therefore, the bending and assembling work of the work required for manufacturing the bow portion can be easily performed, and the automation of the processing can be easily performed. The construction cost can be reduced.

Further, by forming the bow portion using a pair of cylindrical surfaces having the same radius, each processing of the work is simplified, and more efficient automation is promoted.
The production of the bow portion can be proceeded more rationally, and the construction cost can be further reduced.

In addition, by using a cylindrical surface having different radii on the upper side and the lower side, or by forming a bow using a cylindrical surface of a quadratic curved surface, a fertilized ship such as a tanker or a container ship may be used. A bow having an appropriate outer shape can be manufactured according to the type of boat such as a lean boat, and a bow having an excellent effect of reducing wave-making resistance can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a side view on a bow side showing a bow structure of a ship according to a first embodiment of the present invention.

FIG. 2 is a plan sectional view taken along the line II-II in FIG.

FIG. 3 is a front sectional view partially in section along the line III-III in FIG. 1;

FIG. 4 is a sectional view of a bow portion taken along a line AOB in FIG. 2;

FIG. 5 is a view for explaining a bow structure of a ship according to a second embodiment of the present invention.

FIG. 6 is a side view of a bow side showing a bow structure of a ship according to a third embodiment of the present invention.

FIG. 7 is a plan view along the line VII-VII in FIG. 6;

8 is a partial sectional front view taken along the line VIII-VIII in FIG. 6;

FIG. 9 is a sectional view of the bow portion taken along line AOB in FIG. 6;

FIG. 10A is a side view of a bow side showing a bow structure of a conventional ship. 10B is a front sectional view partially sectioned along the line XX in FIG.

FIG. 11 is a plan sectional view taken along the line XI-XI in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hull 2 ... Bow part 4 ... Bow protruding part 4a, 4b ... Cylindrical wall 11 ... Tip part H ... Bow perpendicular L ... Full load waterline.

Claims (4)

[Claims] In a bow structure of a ship, wherein a bow portion protruding forward of a bow perpendicular line below a full load draft line of the ship is formed, said bow portion is a cylinder having a predetermined cross-sectional shape from both the left and right sides of said bow portion. A projection that is formed by projecting in a direction intersecting with the center plane of the hull in front of the bow perpendicular to the bow and that narrows in the width direction as it faces forward, and a curved surface that smoothly connects the intersections of the respective cylindrical surfaces. A bow structure of a ship characterized by being constituted. 2. The protruding portion is formed by projecting a pair of cylindrical surfaces having the same radius from both the left and right sides of the bow in a direction intersecting the hull center plane forward of the bow perpendicular. Item 2. The bow structure of a ship according to Item 1. 3. The projecting portion is formed by projecting a pair of cylindrical surfaces having different radii on the upper and lower sides from both the left and right sides of the bow in a direction intersecting the forward of the bow at the center plane of the hull. The bow structure of a ship according to claim 1, wherein: 4. The protruding portion is formed by protruding a cylindrical surface other than a pair of cylindrical surfaces formed by quadratic curved surfaces from the left and right sides of the bow in a direction intersecting the bow center plane forward of the bow perpendicular. The bow structure of a ship according to claim 1, wherein