KR100516948B1 - Double hull structure - Google Patents

Abstract

The present invention discloses a novel hull structure in a novel manner.

The double hull structure used for oil tankers and container carriers is a high-strength structure that can be damaged by collision or stranding, causing marine pollution or sinking accidents. In order to prevent this, in the present invention, the inner plate structure and the outer plate structure are separated and connected to an elastic structure, which is preferably a longitudinal strength structure, so that the external force energy applied to the outer plate structure is absorbed and dispersed by the strain energy of the elastic structure. Damage to the inner plate structure was prevented.

Description

Double hull structure

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the hull structure of ships, and more particularly to the double hull structure used in tankers, container carriers and the like for carrying fluid cargo.

Oil tankers have been widely used as one of the salt water carriers for transporting liquid cargo such as crude oil, petroleum products, or chemicals. Restrictions were laid on the structure, and the US Coast Guard's proposal to meet the requirements led to the adoption of a double hull structure in the tanker area of tankers. This double hull structure is used to store and / or transport crude oil or petroleum products of a certain size, such as Floating Storage Offloading (FSO) or Floating Production Storage Offloading (FPSO), as well as crude oil carriers and chemical carriers in accordance with subsequent regulations such as SOLAS. Even production facilities have been applied.

On the other hand, in case of a container carrier, it is necessary to be configured as a box type with a large opening as long as possible for the transportation of a large quantity of containers and convenience of loading and unloading as unit freight of a predetermined standard such as 20ft or 40ft is loaded. In this case, the hull is also composed of a double hull structure to improve safety in case of longitudinal strength, torsional strength and collision.

1 and 2 show conventional methods used in tankers as an example of such a double hull structure.

In FIG. 1, the cargo area of the tanker collides with a double hull structure in which the side plate surrounding the cargo hold Tk is composed of an outer bottom plate Bo, an inner bottom plate Bi, an outer plate SO and an inner plate Si, respectively. Or fluid cargo such as oil stored in the cargo hold (Tk) is not leaked directly when stranded.

On the other hand, the deck Dk is composed of a single plate and is supported by a deck deck girder (Gd) in the longitudinal direction and a deck frame (Fd) in the transverse direction, and the bottom and side surfaces also have an inner plate (Bi). It is supported by a bottom girder (Gb), a side girder (Gs), etc. which connect Si) and outer plates Bo and So.

These girders (Gd, Gs, Gb) are mainly strength members that contribute to the longitudinal strength of the hull, the lateral strength of the hull deck frame (Fd) and the inner plate (Bi, arranged at a predetermined interval in the longitudinal direction of the hull The web frame (Fw) connecting the Si and the outer plates (Bo, So) is mainly in charge. In addition, the local strengths of the inner and outer shells (Bi, Si) and outer shells (Bo, So) for cargoes such as petroleum and external seawater are handled by stiffeners (Tl).

The side girder (Gs), the bottom girder (Gb) and the web frame (Fw) are plates that connect the inner plates (Si, Bi) and the outer plates (So, Bo) integrally, and are not actually continuous plates. A manhole (H) is formed for weight reduction, traffic, and reinforcement, and a flange or stiffener is installed around the manhole (H), and its cross section is shaped like a lower side girder (Gs) on the left side of FIG. Has

On the other hand, even when these side girders (Gs), bottom girders (Gb) and web frames (Fw) are assembled in L-shaped steel or T-shaped steel, brackets are provided at the ends for continuity and reinforcement of the structure. Since it is attached, it becomes substantially the same form as the case comprised with a board | plate material.

1 is a general longitudinal structure in which the stiffener Tl is arranged in the longitudinal direction of the hull, and the longitudinal stiffener Tl contributes not only to the local strength but also to the longitudinal strength. However, the double hull structure has a much larger section modulus than the single hull structure, and if the longitudinal stiffener (Tl) is adopted, the cross section coefficient becomes larger and becomes uneconomical. Neutral axis (NA) is significantly lowered there is a problem that the required thickness of the deck (Dk) is large.

As a result, the lateral structure method as shown in FIG. 2 is adopted in the tanker having a double hull structure, and the horizontal structure is mainly localized such as a conventional ore carrier, an icebreaker, or an ice-sea zone navigation line. Concentrated loads have been used in the hull structure, which is a problem.

In the lateral structure method, the stiffeners Tl for supporting the inner plate Si and the outer plate So are arranged in the transverse direction of the hull, that is, the vertical direction of the drawing. Although the local strength is high, it does not affect the hull longitudinal strength.In the case of adopting the double hull structure, the deck (Dk) is raised by raising the neutral axis (NA) by improving the lateral strength at the time of collision and preventing the increase of excessive cross-sectional coefficient. The thickness of the can be reduced.

In the horizontal structure method, the inner and outer plates Si and So are reinforced by the side girders Gs in the longitudinal direction and the web frames Fw arranged at predetermined intervals in the hull length direction so that the inner and outer plates Si and So are integrally formed. It will have a structure that is combined.

However, despite the double hull structure in which vertical and horizontal structural members are integrally combined, the inner plates (Si, Bi) and the outer plates (So, Bo) are damaged at the same time during collision or stranding, and oil leaks from the tanker's cargo hold (Tk). There are frequent accidents that pollute the sea and sink due to the flooding of cargo holds on container carriers.

According to the applicant's consideration, the cause can be summarized into two reasons. The first reason is that despite the one-piece structure according to the conventional structure, the impact energy due to collision or stranding is not transmitted efficiently to the adjacent structure, that is, the impact is not absorbed. Since energy is concentrated locally, it is believed that the energy is concentrated not only on the outer plate (So, Bo) but also on the inner plate (Si, Bi). The second reason is that even though the impact energy cannot be efficiently distributed, the vertical and horizontal structural members are integrally combined so that some structural damages such as outer plates (So, Bo) may be damaged by the frame (Fw) or girder (Gs, Gb). And inner plates Si, Bi, etc., i.e., local damage causes damage to adjacent structures.

Accordingly, there is an urgent need to provide a hull structure capable of efficiently propagating and absorbing the impact energy applied to the hull by collision or stranding and preventing the propagation of damage to the adjacent structure. An object is to provide a hull structure.

In order to achieve the above object, the double hull structure according to the present invention is characterized in that the inner plate structure and the outer plate structure are mutually separated from each other by connecting the inner plate structure and the outer plate structure instead of integrally combining the inner plate and the outer plate as in the related art. .

According to one aspect of the present invention, the elastic structure is composed of longitudinal strength structural members, and a compression member that directly absorbs the impact energy as strain energy, and, if necessary, while suppressing the deformation of the compression member, the impact energy is also strain energy It consists of a tension member to absorb.

(Example)

Such specific features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

In the following description, since the same member numbers as those of FIGS. 1 and 2 denote the same members, duplicate descriptions will be omitted with reference to the corresponding descriptions.

3 to 4, the inner side plate Si and the outer side plate So are integrally formed with side girders (Gs of FIGS. 1 and 2) or web frames (Fw of FIGS. 1 and 2) as in the prior art. Instead of being combined, it is separated into an inner plate structure 1 and an outer plate structure 2 according to the features of the invention.

Both structures (1, 2) are preferably plate (Si, So), respectively, half-ring frame (Fi, Fo) bonded to it, and stiffeners for local reinforcement of both plates (Si, So). The stiffeners are arranged in the longitudinal or transverse manner as shown in Figs. 1 and 2, but when they are shown in the drawings, the drawings are omitted because they are excessively complicated in the drawings.

Here, the names of the half ring frames Fi and Fo are partial frames that separately support the inner plate Si and the outer plate So, instead of integrally connecting the inner plate Si and the outer plate So. It means that it has the shape of a long C shape or half of an elongated circle shape, and preferably has flanges (Ni, No) as shown in Fig. 4 (especially shown in Figs. 5 and 6). It consists of a T-shaped cross section and the half frames (Fi, Fo) of both plates (Si, So) are alternately arranged.

The inner plate structure 10 and the outer plate structure 2 which are separated from each other are connected by the elastic structure 3. It should be noted that the side girders (Gs) and the webber frame (Fw), which have been integrally connected to the inner and outer plates (Si, So), also have some elasticity, but when the external force is applied to the hull side direction, they are largely plastically deformed. It is difficult to name the elastic structure because it absorbs external force.

Preferably, the elastic structure 3 is composed of a longitudinal strength structural member that intersects the inner and outer plate structures 1 and 2, which are lateral strength structural members, and has a substantially V-shape so as to have at least one knuckle portion 4a in its cross section. It includes a compression girder (4) bent to. The compression girder 4 has both ends joined to the outer plate So and the inner plate Si, respectively, to serve as a longitudinal strength member of the hull and to be compressed as described below when an external force is applied in the transverse direction of the hull. Absorb energy from external force into strain energy.

Meanwhile, if necessary, a tension girder 5 to assist the action of the compression girder 4 may be further included in the elastic structure 3. The tension girder 5 is formed in a substantially V-shape with a knuckle portion 5a bent at its cross section opposite to the compression girder 4. The tension girder 5 also acts as a longitudinal strength member and assists the energy absorption of the compression girder 4.

As such, when the compression girder 4 and the tension girder 5 are provided together, the compression girder 4 preferably has both ends of the outer plate So and the inner plate, as shown in FIG. 5. Each intermediate | middle is joined to (Si) and the flange Ni of the half ring frame Fi of the inner board structure 1 is joined. As a result, the node stiffness on the inner plate structure 1 side of the compression girder 4 is large, and when the external force is applied, the compression girder 4 is similar to the cantilever support together with the outer plate structure 2. It will be deformed.

On the other hand, both ends of the tension girder (5) may be joined to the inner and outer plates (Si, So), but both ends of the structure as shown in Figure 6 for the efficient assistance of the action of the compression girder (4) ( The flanges Ni and No of the half ring frames Fi and Fo of 1,2) are respectively joined.

The compression girder 4 is further preferably constituted in a substantially Z shape with a reverse bent portion 4b on the inner plate structure 1 side, and this reverse bent portion 4b is a compression girder 4. By increasing the joint stiffness at the inner plate structure (1) side of the inner plate structure (1) at the same time, the welding of the inner and outer plates (Si, So) in the same direction, that is, the lower view posture, respectively It will help you.

In addition, the compression girder 4 and the tension girder 5 are preferably arranged such that the knuckle portions 4a and 5a are adjacent to each other in accordance with the operation described later.

Such a double hull structure of the present invention will be described with reference to FIG.

The present invention basically connects the inner plate structure (1) and the outer plate structure (2) separated from each other by the elastic structure (3), the elastic structure (3) absorbs and distributes the external force applied to the outer plate structure (2) This is achieved in the above embodiment as follows so as not to be transmitted to the inner plate structure (1).

The impact energy applied to the outer plate So is transmitted to the half ring frame Fo of the outer plate structure 2 through a stiffener (not shown in FIG. 7). When Fo) is curved deformation to the right side of the drawing as shown by the dashed line, the compression girder 4 coupled to the outer plate structure 2 also absorbs the impact energy as strain energy while compressing as shown by the dashed line.

At this time, since the compression girder 4 has a large nodal rigidity on the inner plate structure 1 side, the knuckle portion 4a is deformed to approach the tension girder 5 side, so that the outer plate structure 2 is In the tension girder (5) position is to be deformed to the outside to tension the girder girder (5). As a result, the tension girder 5 absorbs a part of the impact energy as strain energy.

The tension girders 5 also stretch between both structures 1 and 2 during the deformation process, so that excessive deformation between the structures 1 and 2, that is, excessive compression deformation of the compression girder 4, can be achieved. Will be suppressed.

In this way, the impact energy due to the external force X applied to the outer plate Si side is not intensively transmitted to the inner plate SO side along the transverse strength member as in the prior art, and the compression girder 4 and the tensile strength member which are the longitudinal strength members are tensioned. While absorbed by the strain energy of the girder 5, it is dispersed in its longitudinal direction, that is, in the longitudinal direction of the hull, to mitigate the possibility of damage.

In addition, before the elastic structure 3 including the compression girder 4 and the tension girder 5 yields as a whole, the impact energy due to the external force X applied to the outer plate structure 2 is applied to the inner plate structure 1. Since it is not directly transmitted to the) it is possible to fundamentally prevent leakage or flooding of the cargo hold (Tk) due to damage of the inner plate structure (1).

Therefore, the present invention is used in oil tankers, container carriers, etc., thereby preventing marine pollution or sinking in a sea accident, thereby greatly improving safety and reliability of a ship.

According to the present invention having the above configuration, when the shell structure is damaged by collision or stranding, the impact energy is absorbed by the elastic structure is not absorbed directly to the inner plate structure damage of the inner plate structure and thus the cargo hold Leaks or sinking of ships can be solved.

1 is a cross-sectional view showing a conventional double hull structure by the longitudinal structure,

Figure 2 is a cross-sectional view showing a conventional double hull structure by the horizontal structure method,

3 is a cross-sectional view showing a double hull structure according to the present invention,

4 is a main part perspective view of FIG. 3;

5 and 6 are plan views taken along the lines V-V 'and VI-VI' of FIG. 3, respectively;

Figure 7 is an enlarged cross-sectional view showing the main part of the present invention in the collision of the double hull structure of the present invention.

<Description of the symbols for the main parts of the drawings>

One; Inner plate structure

Si; inner plate

Fi; half ring frame

2; outer plate structure

So; outer plate

Fo; Half frame

3; Elastic structure

4; compression girder

5; tension girder

4a, 5a; Knuckle

4b; reverse bend

Claims (8)

In a double hull structure of a ship having an inner plate and an outer plate, the inner plate and the transverse strength structural material and the outer plate and the transverse strength structural material connected thereto are separated from each other to separate and constitute the inner plate structure and the outer plate structure, and Is provided with an elastic structure connecting the inner plate structure and the outer plate structure, The elastic structure is a double hull structure, characterized in that consisting of a compression girder and a tension girder having a knuckle portion bent in a V-shape. The method of claim 1, The compression girder and the tension girder is a double hull structure, characterized in that consisting of longitudinal strength structural members extending in the longitudinal direction of the vessel. The method of claim 1, The compression girder and the tension girder is a double hull structure, characterized in that the bent portion is disposed facing each other. The method of claim 1, The inner plate structure and the outer plate structure each having a half ring frame extending in the vertical direction of the ship, the half ring frame of the inner plate structure and the half ring frame of the outer plate structure are arranged alternately with each other Hull structure. The method of claim 1, Both ends of the compression girder is a double hull structure, characterized in that bonded to the inner and outer plates, respectively. The method of claim 5, And a reverse bending portion bent in an opposite direction to an inner plate side end of the compression girder. The method of claim 4, wherein A double hull structure characterized in that the inner side of the inner side of the compression girder is joined to the half ring frame of the inner side plate structure. The method of claim 4, wherein Both ends of the tension girders are joined to the half ring frame of the inner plate structure and the half ring frame of the inner plate structure, respectively.

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