JPH0840347A - Tip structure of submerged ship with submerged body - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a structure of a tip portion of a connecting body which prevents stress concentration at the joints with the lower surface of a main hull and the upper surface of a buoyancy body and facilitates work such as welding during assembly. A connecting body 3 has an outer wall 4 and an inner wall 5 which extend from the main hull 1 to the buoyancy body 2 in a substantially vertically downward direction and are parallel to each other, and the front end edges of the both walls are arcuate toward the rear. And a front end wall 6 curved rearward is formed between the main wall and the buoyant body between the two walls,
Along the front edges of the both walls, a FRP cover plate 7 having a horizontal cross-sectional shape that bulges forward in a curved shape is fixed by stud bolts 8 so as to block between the both walls.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end structure of a connecting body of a ship having a submerged body. More specifically, in a connecting body for connecting an upper main hull and a lower immersion body of a submerged-equipped ship, such as a catamaran, for example, the strength of the joint between the main hull and the submerged body at the distal end thereof The present invention relates to a structure of a leading end portion of a connector which is significantly improved.

[0002]

2. Description of the Related Art The above-mentioned submerged body-equipped ship is, for example, a catamaran, a hydrofoil or a composite support type ship (obtaining lift from both a buoyant body and a hydrofoil). Means a ship equipped with a submerged body. A catamaran is equipped with a buoyant body as a submerged body, a hydrofoil is equipped with a hydrofoil and a support for supporting the same, and a composite support type ship is equipped with a hydrofoil and a buoyant body as a support for the hydrofoil. It has. Hereinafter, a catamaran will be described as an example.

As shown in FIGS. 6 and 7, a catamaran 51 is provided with a pair of buoyant bodies 53 parallel to each other in the front-rear direction at the lower part of a main hull 52 of the catamaran. Each of the pair of buoyancy members 53 is fixed to a lower end edge of a connecting body 54 extending substantially vertically downward from the main hull 52. Figure 6 (a)
6B is a front view of the catamaran 51, and FIG. 6B is a catamaran 51.
FIG. 4 is a side view of the vicinity of the front end of FIG.

As shown in FIG.
Stands substantially vertically, and the lower surface of the main hull 52 and the buoyant body 5
3 The shape is joined substantially at right angles to the upper surface. This point is disclosed in JP-A-56-43080 and JP-B-58-58.
Also disclosed in Japanese Patent No. 44451/44 and the like.

Further, as shown in FIG. 7, a conventional connecting member 54 is used.
The width of the catamaran is gradually narrowed toward the front in order to reduce the resistance of seawater during navigation of the catamaran, and the front end of the connecting body has a horizontal cross-sectional shape that bulges forward in a curved shape. Presents. The connecting body 54 having such a shape is generally integrally formed by bending from an aluminum alloy plate, a steel plate or the like, and is fixed to the lower surface of the main hull 52 (FIG. 6) and the upper surface of the buoyant body 53 by welding. ing. The width of the connecting body 54 is normally wide enough for an operator to enter, but is so narrow that it becomes impossible to enter the connecting body 54 toward the front end.

On the other hand, the catamaran is subjected to an external force such as pitching or slamming during the navigation so that the space between the front of the main hull and the front of the buoyant body alternately expands and contracts as the bow rises and descends. Works. That is,
When the bow descends, the resistance of seawater acts upward on the front of the buoyancy body, and when the bow rises, the resistance of seawater acts downward on the front of the buoyancy body. Further, due to slamming (a phenomenon in which the bottom of a ship or a buoyant body is hit by waves), an upward external force acts on the bottom of the ship, and an upward external force also acts on the bottom of the buoyant body at times. Such an external force accompanies the pitching or slamming of the catamaran and therefore acts repeatedly.

[0007]

The conventional catamaran having the above-mentioned structure has the following problems. That is, (1) Since the front edge of the connecting body and the joints of the lower surface of the main hull and the upper surface of the buoyancy body are at a right angle, stress concentration occurs at the above-mentioned part when an external force as described above acts. Fatigue damage occurs in a short time due to high cyclic stress.

(2) It is necessary to cut the lower end edge of the connecting body 54 so as to match the upper surface of the buoyancy body 53 which is a cylindrical curved surface, and furthermore, since it is integrally formed by bending from a metal plate, the connecting body 54 is connected. The manufacturing of the body 54 is cumbersome and the manufacturing cost is high.

(3) Since the width of the front end portion 54a of the connecting body is extremely narrow, it is difficult to weld from the inside when the connecting body is attached, and the front end portion 54a of the connecting body, in particular, the lower end portion is circular. Since it is vertical to the upper surface of the buoyant body 53, which is a columnar curved surface, positioning and welding work during welding become difficult.

That is, in the conventional catamaran, there was a structural weak point at the joint between the connecting body and the main hull and the buoyancy body. In fact, there have been many reports on damage to the site.

The present invention has been made in view of the above problems of the prior art, and stress concentration occurs at the joints between the tip of the connecting body and the lower surface of the main hull and the upper surface of the submersible body represented by the buoyancy body. It is an object of the present invention to provide a structure for connecting a tip end portion of a submersible body equipped ship represented by a catamaran that facilitates work such as welding during assembly.

[0012]

In order to achieve the above object, the present invention has a connecting body which has an outer wall and an inner wall which extend substantially vertically downward from a main hull to a submersible body and which are parallel to each other. At each tip edge of each wall, at least the vicinity of the joint between the main hull and the submerged body is recessed in a curved shape, and a tip wall extending from the main hull to the submerged body is formed between the both walls. I am trying.

If at least the vicinity of the joint between the main hull and the submerged body in the tip wall is curved rearward so as to substantially follow the concave curve of the front end edges of the inner and outer walls, the stress concentration of the joint can be improved. It is preferable because the prevention effect is improved.

A cover plate having a horizontal cross-sectional shape that bulges forward in a curved shape along the leading edges of the outer wall and the inner wall is mounted so as to close the space between the two walls.
It is preferable from the viewpoint of reducing resistance when navigating a ship equipped with a submersible body.

Further, it is preferable that the cover plate is fixed to the tip wall by at least one bolt member because it can be detachable.

Further, it is preferable to interpose a hinge member at the intermediate portion of the bolt member because it can be bent in the middle.

If the cover plate is made of a synthetic resin material that is softer than steel or aluminum alloy, which is the material of the hull structure, it is possible to sufficiently follow the minute deformation in the vicinity of the tip of the connecting body during the navigation of the submersible equipped vessel. It is preferable because it is possible.

In addition, it is preferable to fill the space between the cover plate and the tip wall with synthetic resin foam from the viewpoint of reinforcing the tip of the connecting body and watertightness between the inner and outer walls.

It is preferable that the tip wall is formed of a flat plate extending in the vertical direction because the assembling work becomes easy.

The leading edges of the outer wall and the inner wall are
It is also possible to have a shape that is recessed in an arc shape toward the rear over the entire length.

The "outer wall" referred to in the claims is
Regarding the `` inner wall '', when a pair of connected bodies are viewed in the front-rear direction of a submerged vessel, the one located laterally outside the submerged vessel is called the outer wall, and the one located laterally inside is called the inner wall. In. Further, “rear” means the rear when the direction of the tip of the connected body is the front. Further, the “horizontal cross section” means a cross section obtained by cutting a connected body that is directed substantially vertically downward on a horizontal plane.

The structure of the distal end portion of the connecting body of the present invention can be applied not only to the front end portion but also to the rear end portion of the connecting body. In addition, the present invention is naturally applicable to a connected body such as a hydrofoil ship in which only one connected body is mounted at the lower center of the main hull (therefore, there is only one submerged body). Further, there are ships in which a plurality of connected bodies are mounted in the front-rear direction of the main hull, but it is needless to say that the present invention can also be applied to the connected bodies of these ships.

[0023]

With the above construction, the connecting body tip structure (hereinafter simply referred to as the tip structure) of the present invention is connected to the lower surface of the main hull and the upper surface of the submerged body by a partially circular curve, thereby preventing the occurrence of stress concentration. . Therefore, the fatigue life of the submerged vessel against pitching and slamming is greatly extended. Furthermore, since two parallel wall plates called inner and outer walls are fixed to the lower surface of the main hull and the upper surface of the submerged body,
Welding work including alignment is easy. In addition, since one wall plate called a tip wall is fixed to each of the above-mentioned surfaces and the inner and outer wall surfaces between the opened inner and outer walls, furthermore, the site in the connected body can be easily inserted by an operator. Since the width is as small as possible, welding from the inside is also easy.

Further, in the case of the tip structure having the cover plate attached, the resistance of seawater at the tip is reduced. Further, if the cover plate is attached with a bolt member, the assembling work and the replacing work become easy. In addition, it is possible to make the cover plate deformable to some extent by making the bolt member a so-called folding type by a hinge member, or by forming the cover plate from synthetic resin, or by adopting either of them. . By doing so, it is possible to sufficiently follow a minute deformation near the distal end of the coupled body during the navigation of the submerged vessel.

It is also possible to fill the space between the cover plate and the tip wall with synthetic resin foam at the time of assembling or after assembling, and by doing so, the function of preventing water from entering the inside of the connected body can be further enhanced. At the same time, the rigidity of the tip of the connected body is also improved.

[0026]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view showing an embodiment of the tip portion structure of the present invention, FIG. 2 shows the tip portion structure of FIG. 1, and FIG. 2 (a) is a transverse sectional view thereof. Yes FIG. 2 (b) is a vertical sectional view, FIG. 3 is a vertical sectional view showing another embodiment of the tip structure of the present invention, FIG. 4 is a sectional view taken along line XX of FIG. 2 (a), and FIG. It is a cross-sectional view showing another embodiment of the tip structure of the present invention.

As the name suggests, the structure of the front end of the connected body of the present invention is applied to both the front end and the rear end, but in the following embodiments, the front end will be described as an example. Therefore, the “tip wall” in the claims is referred to as a “front end wall” in the following embodiments.

In FIGS. 1 and 2, 1 is a main hull, 2 is a buoyant body, and 3 is a connecting body. The buoyancy body 2 may be submerged in its entirety when the catamaran sails.
As shown in (a), it may partially come out on the water surface. The connecting body 3 has an outer wall 4 extending vertically downward from the lower surface of the main hull 1 and reaching the upper surface of the buoyant body 2, and an inner wall 5 provided inside and parallel to the outer wall 4. The outer wall 4 and the inner wall 5 are separated from each other so that a person can perform construction, and are fixed to the main hull 1 and the buoyancy body 2 by welding. Further, both the outer wall 4 and the inner wall 5 have a shape in which the front edges 4a, 5a are cut in an arc shape toward the rear as shown in the figure.

A front end wall 6 is attached slightly rearward from the front ends of the outer wall 4 and the inner wall 5 so as to close the walls 4 and 5. The front end wall 6 is a front end edge 4a, 5a of both walls 4, 5.
The four sides are welded to the main hull 1, the buoyant body 2, the outer wall 4 and the inner wall 5.
The front end wall 6 functions to reinforce the front end of the connector 3 and prevent water from entering the connector 3.

The magnitudes of the curvatures of the front end edges 4a, 5a of the inner and outer walls and the front end wall 6 are not particularly limited, and any curvature may be larger. Furthermore, the shape of the connecting portion 3 need not necessarily be arc-shaped, but may be any shape as long as the joint between the front end edge of the connecting body 3 and the main hull 1 or the buoyant body 2 intersects smoothly, not at a right angle or the like. Therefore, as for the front end edges 4a and 5a of the inner and outer walls, as shown in FIG. 3, the central portions 4b and 5b are linear sides, and only the joining portions 4c and 5c with the main hull 1 and the buoyancy body 2 are provided. It may be recessed in a curved shape. The overall shape of the cover plate 7, which will be described later, in the longitudinal direction is also substantially the same as the front end edge of the connecting body 3. On the other hand, the front end wall 6 is not particularly limited to a curved one, and may be, for example, a flat plate as shown in FIG. In this way, the front end edges 4a, 5a and the front end wall 6 of the inner and outer walls having various shapes can be combined. By having such a shape, it is possible to prevent stress concentration from occurring in the joint portion.

Both front and rear edges 4a and 5a of the inner and outer walls are provided with both 4a,
5a so as to close the space between the fibers 5a.
RP) is attached. The cover plate 7 includes front end edges 4a, 5 of the inner and outer walls.
The edges 4a, 5a are curved at substantially the same curvature along the line a. The horizontal cross section has a substantially semicircular shape, which is effective for reducing the resistance of seawater during navigation of the catamaran. However, the horizontal cross-sectional shape is not particularly limited to a semi-circular shape, and may be, for example, a semi-elliptical shape (especially cut in an end axis direction). Also, by forming this cover plate 7 from FRP which is more flexible than the main hull 1 and the buoyant body 2 (both are usually made of metal), the main hull 1, which will occur when the catamaran sails, The buoyant body 2 can sufficiently follow a minute deformation such as expansion and contraction between the distal ends of the buoyancy body 2, so that there is no possibility of damage.

As will be apparent from FIG. 4 as well, the cover plate 7 in this embodiment has stepped portions 7a formed on both side edges thereof so as to be fitted with the front end edges 4a and 5a of the inner and outer walls. Further, it is fixed by three stud bolts 8 protruding from the front end wall 6. Therefore, it is easy to attach the catamaran when assembling it, and the replacement work is also easy. Further, since the stud bolt 8 is an elongated member, the deformability of the cover plate 7 is not significantly impaired. The number of stud bolts 8 is not particularly limited to three, and can be increased or decreased as appropriate according to the size of the connecting body or the size of the stud bolts. Further, the mounting method of the cover plate 7 is not particularly limited to stud bolts, and other known mounting means such as drilling a bolt hole in the front end surfaces of the inner and outer walls and directly mounting the cover plate with bolts and nuts. And a suitable one can be selected.

Although not shown in the drawings, it is preferable that the stud bolt is of a center-folding type by forming a hinge portion such as a pin joint in the middle portion thereof. By doing so, the deformation followability of the cover flange is improved. Further, although not shown, if the space (shown by 9 in FIGS. 1 and 4) between the cover plate 7 and the front end wall 6 is filled with synthetic resin foam such as urethane foam, Since the rigidity of the front end portion of the connecting body 3 is improved and the function of preventing water from entering the inside of the connecting body 3 is improved, a rust prevention effect is also exhibited, which is preferable. The filling of the synthetic resin foam may be performed by filling and foaming the foamable synthetic resin after attaching the cover plate, or a foam is formed in advance in an outer shape corresponding to the shape of the space 9, and this is formed at the time of assembly. It may be accommodated in the space 9.

FIG. 5 shows a catamaran in which the buoyant body 11 is attached in a different shape from the above-described embodiment (FIGS. 1, 2 and 4). That is, the buoyant body 11 is attached so that the entire buoyant body 11 is located inside the connecting body 12. The front end structure of the connecting body can be applied to the catamaran as it is.

[0036]

According to the structure of the connecting body tip portion of the present invention described above, stress concentration is prevented from occurring at the joints between the tip portion of the connecting body and the lower surface of the main hull and the upper surface of the buoyancy body, and at the time of assembly. The work such as welding becomes easy.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing one embodiment of a tip structure according to the present invention.

FIG. 2 is a cross-sectional view (FIG. 2 (a)) and a vertical cross-sectional view (FIG. 2 (b)) of the tip structure of FIG.

FIG. 3 is a longitudinal sectional view showing another embodiment of the tip portion structure of the present invention.

FIG. 4 is a sectional view taken along line XX of FIG.

FIG. 5 is a cross-sectional view showing another embodiment of the tip structure of the present invention.

6 is a cross-sectional view showing an example of a conventional tip structure (FIG.
It is (a)) and a longitudinal cross-sectional view (FIG.6 (b)).

FIG. 7 is a perspective view showing a main part of the distal end structure of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main hull 2 ... Buoyant body 3 ... Connection body 4 ... Outer wall 5 ... Inner wall 6 ... Front end wall 7 ... Cover plate 8 ... Stud bolt 11 ... Buoyant body 12 ・ ・ ・ Connected body

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tadashi Matsuzaka 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd. Kobe factory (72) Kenshiro Higashi Higashikawasaki, Chuo-ku, Kobe-shi, Hyogo 3-1, 1-1, Kawasaki Heavy Industries Ltd. Kobe factory

Claims (9)

[Claims] 1. A tip structure of a connecting body for connecting an upper main hull and a lower submersible body of a ship equipped with a submersible body, said connecting body being substantially vertically downward from the main ship to the submerged body. Having an outer wall and an inner wall that are parallel to each other and are extended to
At the leading edge of each of the both walls, at least the vicinity of the joint between the main hull and the submerged body is recessed in a curved shape,
A front end wall structure extending from the main hull to the submerged body is formed between the both walls. 2. The tip wall is curved rearward so that at least the vicinity of the joint between the main hull and the submerged body is substantially along the concave curve of the tip edges of the inner and outer walls.
The structure of the distal end portion of the connected body described. 3. A cover plate having a horizontal cross-sectional shape that bulges forward in a curved shape along the front edges of the outer wall and the inner wall is mounted so as to close the space between the both walls. 1. The structure of the tip of the connected body according to 1. 4. The cover plate is fixed to the tip wall by at least one bolt member.
The structure of the distal end portion of the connected body described. 5. The tip structure of a connecting body according to claim 1, wherein the bolt member has a hinge member at an intermediate portion thereof so that the bolt member can be bent inside. 6. The distal end structure of a connecting body according to claim 1, wherein the cover plate is made of a synthetic resin material. 7. A synthetic resin foam is filled in a space between the cover plate and the tip wall.
The structure of the distal end portion of the connected body described. 8. The connecting body tip structure according to claim 1, wherein the tip wall is a flat plate extending in the vertical direction. 9. The leading edges of the outer wall and the inner wall,
The distal end portion structure of the connecting body according to claim 1, wherein the connecting body tip portion structure has a shape recessed in an arc shape toward the rear over the entire length.