JP3187232B2 - Hull double shell structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double hull structure of a hull in which an outer shell and an inner shell each reinforced with a plurality of radial protection members are connected by a trans web, a horizontal girder and struts. In particular, it has been improved to prevent the inner shell from cracking when it encounters a collision with another ship or stranded.

[0002]

2. Description of the Related Art In recent years, it has become mandatory to form a double hull of a tanker hull in order to prevent oil from flowing out of a large tanker when a large tanker collides with another ship. Various hull double shell structures have been proposed with measures taken. For example, as shown in FIGS. 10 and 11, a common hull double-shell side wall structure 100 includes a plurality of radial protection members 5 extending in the longitudinal direction of the ship (perpendicular to the plane of FIG. 10). A plurality of transformer webs 108 which are provided with an outer shell 6 provided on the inner side and an inner shell 7 having a plurality of radial protection members 5 extending in the longitudinal direction of the ship on the outer side of the inner plate 4 and a plurality of trans-webs 108 are provided in the longitudinal direction of the ship. A plurality of horizontal girders 109 spaced apart in the direction are integrally connected to form a highly rigid structure. In this high-rigidity double-shell side wall structure 100, in order to minimize the deformation at the time of collision with another ship S and to minimize the occurrence of cracks that cause oil spillage, (1) anti-radiation material (longitudinal or longitudinal ribs) , Stiffeners), 5 (2) increase the distance between the outer shell 6 and the inner shell 7 (depth of the double shell), (3) plate thickness of the double shell constituent member Measures such as enlarging the dimensions are taken to further increase the structural rigidity. A prior art as an example of such a device is described in, for example, Japanese Utility Model Laid-Open No. 4-48097.

[0003]

However, in the conventional double-shell side wall structure 100 of the hull, the number of the railing members 5 is increased, and the thickness of the double-shell constituent members such as the thickness is increased. Not only increases the weight of the hull, increases the number of man-hours and construction costs, but also increases the depth of the double hull, restricting the loading capacity, increasing the required propulsion horsepower of the ship and deteriorating maneuverability And it was not favorable from the viewpoint of both economic efficiency and performance of the ship. Furthermore, although the high rigidity double shell side wall structure is effective for minor collisions, the outer shell is not used for large collisions where the sharp corners such as the bow of a large ship plunge into the ship at a very high speed. Because of the high integration between the inner shell 6 and the inner shell 7, the inner shell 7 is also deformed in the same manner as the outer shell 6, resulting in a portion having a large curvature,
Cracks are generated not only in the outer shell 6 but also in the inner shell 7 at locations where those curvatures are large, causing outflow of the loaded oil outboard.

[0004] The present invention has been proposed in consideration of the current situation, and has been proposed by changing the way of thinking. Even if the ship lands or collides with another ship, the outer shell having high rigidity can absorb the shock as much as possible. Separate the shell from the outer shell to prevent large deformation of the outer shell from being transmitted to the inner shell and to allow the inner shell to bend gently,
It is an object of the present invention to provide a double hull structure of a hull in which cracks are prevented from being generated in an inner hull, thereby preventing outflow of a load such as oil onboard.

[0005]

In order to achieve the above object, a double hull structure of a hull according to the present invention comprises an outer shell having a plurality of radially extending members extending in a longitudinal direction of the hull on an inner side of an outer plate. A double hull structure of a hull in which a plurality of radially extending materials extending in the longitudinal direction of the ship are connected to an inner shell having an outer side of the inner plate by a plurality of transwebs separated in the longitudinal direction of the ship. A shelf cruciform joint extending in the vertical direction of the ship and having a tearable portion which is strong against compression but weak against tension, is provided on the trans web, and a plurality of horizontal girder is provided inside the outer shell of the outer shell. The horizontal girder and the inner shell-mounted anti-corrosion member are connected to each other by struts between the trans webs, and at least one of the front and rear portions (ends) of the strut (or the connection thereof) Near the part. The same applies to the following.) Is characterized in that a weak tear portion by.

[0006] Preferably, the tear portion of the cross joint of the shelf plate is formed by reducing the leg length of the fillet welding between the transweb and the shelf plate, and at least one of the connecting portions before and after the strut is torn. The part is constructed by reducing the leg length of the strut weld. In addition, the tear portion of the shelf cross joint and at least one of the connecting portions before and after the strut and / or the tear portion near the connecting portion are formed by cutouts. Further, the shelf cruciform joint is provided near the inner shell of the trans web, and at least one of the connecting portions before and after the strut and / or the tearing portion near the connecting portion is connected to the strut and the inner shell-provided radial defense. It is provided on the connection side with the material.

[0007]

In the double hull structure of the hull having the above construction, the outer shell having a plurality of radially extending members extending in the longitudinal direction of the hull on the inner side of the outer plate includes:
Coupling with a plurality of trans-webs spaced in the longitudinal direction of the inner shell having a plurality of radially extending materials extending in the longitudinal direction of the inner plate on the outer side of the inner plate and cooperating with the hull bulkheads, large bone webs, etc. To form a robust side wall structure and bottom wall structure, and to constitute a hull structure that can withstand loads of crude oil and the like and external forces such as waves and water pressure.

According to the present invention, as a countermeasure for preventing the outflow of cargo in the event of a grounding or collision with another ship, the idea is changed from the conventional high rigidity double shell structure and a large current is applied when the outer shell is greatly deformed. In order to protect the important circuit by acting like a fuse, the inner shell is separated and a tearing part (equivalent to the above fuse) that gives flexibility to the inner shell is interposed in the double shell structure. is there.

First, as a specific example, a shelf cross joint extending vertically in a ship and having a tearing portion which is strong in compression but weak in tension is provided on a transformer web. A plurality of horizontal girders are vertically spaced apart from each other on the inside of the ship, and the horizontal girders and the inner shell anti-corrosion material are connected by struts between the transwebs, and at least one of the struts before and after the struts is provided. Since the connecting portion is provided with a tear portion that is strong against compression but weak against pulling, a plurality of radial protection members extending in the longitudinal direction of the ship against the compressive force generated by the impact even if the ship lands or collides with another ship. The outer shell reinforced with horizontal girder protects the inner shell against the maximum. At the same time, when large deformation due to a large impact is mainly transmitted to the inner shell through the transformer web, at least one of the connecting portions and / or the vicinity of the connecting portion in front of and behind struts on both sides of the transweb. The tears are separated by the pulling of the inner shell pushed by the transweb, which allows the inner shell to bend loosely over a wide span, thereby preventing the occurrence of cracks due to local curvature of large curvature. In addition, when a large deformation due to a large impact is mainly transmitted to the inner shell through the horizontal girder and the strut, the tearing portion of the shelf web cross joint of the trans web on both sides of the horizontal girder and the strut is pushed. The inner shell is pulled apart to allow the inner shell to bend loosely over a wide span, thereby preventing the occurrence of cracks due to local curvature having a large curvature. In this way, instead of increasing the rigidity of the conventional double shell structure to protect the inner shell in case of a ground strike or collision with another ship, the idea is changed and the inner shell is separated from the high rigid outer shell. To increase the hull weight, increase the number of man-hours, increase construction costs, restrict the loading capacity, increase the propulsion horsepower of the ship, worsen maneuverability, etc. It is not inviting and is preferable from both the economical and performance aspects of the ship.

Further, the tear portion of the cross joint of the shelf plate is configured such that the leg length of the fillet welding between the transweb and the shelf plate is reduced, and at least one of the front and rear struts is formed. Of the connecting part and the tearing part near the connecting part,
When the strut welding leg length is reduced, the tears can be easily formed by a series of straightened simplified welding operations.

According to a third aspect of the present invention, when the tearing portion of the shelf cross joint and the tearing portion of at least one of the connecting portions before and after the strut are formed by notches, welding is performed after forming the notches in advance. It can be assembled, and the tear strength can be easily adjusted by adjusting the size.

Further, as in claim 4, the shelf plate cross joint is provided near the inner shell of the trans web, and as in claim 5, at least one of the connecting portions in front of and behind the strut is torn. When the inner shell is separated from the outer shell at the tearing part at the time of collision with a stranded or another ship, the rigidity of the outer shell side is maintained high when the In addition, it gives flexibility to the inner shell side, which is desirable in preventing the occurrence of cracks in the inner shell.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a double hull structure of a hull according to the present invention.

FIG. 1 is a partial longitudinal sectional view showing a double shell structure of a port side wall of a large tanker according to a first embodiment of the present invention.
Is a horizontal sectional view showing the deformation state of the double shell structure when another vessel collides with the trans web at the level of arrow II-II in FIG. 1, and FIG. 3 is another vessel to the horizontal girder and strut at the same level. FIG. 4 is a horizontal sectional view showing a deformed state of the double shell structure at the time of collision, FIG.
FIG. 5 is an enlarged horizontal sectional view of a portion V in FIG.

In FIG. 1, a double shell structure 1 of a large tanker (generally symmetrical, so the port side is illustrated here) is attached to the outer plate 3 and its inner side by welding, and is attached in the longitudinal direction of the ship. An outer shell 6 composed of a plurality of radial protection members 5 extending in a longitudinal direction and an inner shell 7 composed of an inner plate 4 and a plurality of radial protection members 5 attached to the outer side of the ship by welding and extending in the longitudinal direction of the ship.
And a plurality of transformer webs 8 spaced in the longitudinal direction of the ship.
And a plurality of horizontal girders 9 and struts 10 which are spaced apart in the vertical direction of the ship. The port side wall double shell structure 1 is connected to the starboard side wall double shell structure, which is substantially symmetrical to port on the port side, by a bulkhead and a large bone web together with the ship bottom double shell structure 2 to form a basic hull of a large tanker. Make up the structure. By the way, anti-radiation material 5
Is formed by welding a face plate 5b to a web 5a in a T-shape by welding and extending horizontally through an opening 8a of the transformer web 8 to reinforce the outer plate 3 and the inner plate 4.

As shown in FIGS. 2 and 4, the trans web 8 is provided with a shelf cross joint 11 having a tear portion 12 extending in the vertical direction of the ship and having a strong compressive force but a weak tensile force. Is interposed. That is, the outer shell side portion and the inner shell side portion of the trans web 8 are arranged in the vertical direction of the ship at an intermediate position between the inner end of the horizontal girder 9 of the outer plate 3 and the face plate 5b of the radial protection member 5 with the inner plate. Extended shelf 1
3 are connected by welding. Here, the tearing portion 12 of the shelf plate cross joint 11 is formed by reducing the leg length of the fillet weld w that attaches the outer shell side portion of the transformer web 8 to the shelf plate 13, such as water pressure, loading load, or the like. And the inner shell 7 is pushed by a locally concentrated compressive force such as in the case of a grounding or collision, and when a large tensile force acts on an adjacent portion, the inner shell 7 is torn and deformed. The inner shell 7 is cut off. The inner shell side portion of the trans web 8 is attached to the shelf plate 13 by fillet welding W having a normal leg length.

As shown in FIGS. 1, 3 and 5, the horizontal girder 9 extends through the opening 8b of the transformer web 8 in the lengthwise direction of the ship and is separated from the outer shell 6 in the vertical direction of the ship. Of the outer shell 3 is welded to the inside of the ship, thereby increasing the rigidity of the outer shell 6 together with the anti-radiation material 5. The horizontal girder 9 comprises a web 9a extending horizontally to a substantially central portion of the double shell structure 1 and a face plate 9b at an inner end thereof. 10
Is connected to the anti-radiation material 5 of the inner shell 7. Here, the tearing portion 15 that protects the inner shell 7 at the time of collision is
The length of the fillet weld w forming the connecting portion between the inner plate 5 and the face plate 5b of the inner shell 5 is made smaller in leg length. Etc., as well as the inner shell 7 due to the locally concentrated compressive force as in the case of grounding or collision.
Is pressed and a large pulling force acts on the adjacent portion, thereby tearing, and separating the inner shell 7 from the deformed outer shell 6. The outer shell side end of the strut 10 is attached to the face plate 9b of the horizontal girder 9 by fillet welding W having a normal leg length.

In the first embodiment having the above-mentioned structure, as shown in FIGS. 2 and 3, even if the bow B of the other ship S collides with the double-shell structure 1 on the side wall of the large tanker. The outer shell 6 reinforced by a plurality of radial protection members 5 extending in the longitudinal direction of the ship and the horizontal girder 9 against the compressive force generated by the ship protects the inner shell 7 as much as possible. At the same time, as shown in FIG. 2, when a large deformation due to a large impact is mainly transmitted to the inner shell 7 through the transformer web 8, the struts 10 on both sides of the transformer web 8 are connected to the inboard side. The torn portion 15 is torn apart by the tension of the inner shell 7 generated by being pushed by the impacted transformer web 8, so that the inner shell 7 can be bent gently over a wide span by a local curvature having a large curvature. Prevent cracks and prevent oil from leaking outboard. As shown in FIG. 3, when a large deformation due to a large impact is mainly transmitted to the inner shell 7 through the horizontal girder 9 and the strut 10, the shelves of the trans webs 8 on both sides of the strut 10 are used. The inboard tearing portion 12 of the plate cross joint 11 is torn off and separated by the tension of the inner shell 7 generated by being pushed by the horizontal girder 9 and the strut 10 which have been hit, so that the inner shell 7 can bend smoothly over a wide span. This prevents the occurrence of cracks due to the local curvature having a large curvature, and prevents the outflow of oil onboard.

FIG. 6 is a partial longitudinal sectional view of the hull of the double hull structure near the inner shell around the transweb according to a second embodiment of the present invention, and FIG. FIG. 8 is a partial longitudinal sectional view of the hull near the inner shell around a double-shell horizontal girder, and FIG. 9 is an inner shell around a double-shell horizontal girder of the ship. FIG.

The double shell structure of the hull according to the second embodiment is also basically the same as the double shell structure 1 of the side wall of the large tanker according to the first embodiment. 2
The configuration of the tear portion unique to the double shell structure of the hull according to the embodiment will be described.

As shown in FIGS. 6 and 7, the transweb 8 has a shelf cruciform joint 11 which extends in the vertical direction of the ship near its inner shell and has a tear portion 12 which is strong in compression but weak in tension. It is interposed. That is, the outer shell side portion and the inner shell side portion of the trans web 8 are connected to the inner end of the horizontal girder 9 of the outer plate and the face plate 5 of the radial protection member 5 with the inner plate 4.
At a substantially intermediate position with the center line b, it is connected by a fillet weld W having a standard leg length via a shelf plate 13 extending in the vertical direction of the ship. The tearing portion 12 of the shelf board cross joint 11 is formed of a cutout formed at a portion where the inner side of the transformer web 8 is attached to the shelf 13, and is sufficient for a large compressive force such as a water pressure or a loading load. When a large tensile force acts on an adjacent portion due to a compressive force that can withstand but is locally concentrated as in the case of a collision, the notch is torn from the notch.

On the other hand, as shown in FIGS. 8 and 9, the horizontal girder 9 extends through the opening 8b of the trans web 8 in the lengthwise direction of the ship and is separated from the outer shell 6 in the vertical direction of the ship. The outer shell 6 is attached to the inner side of the ship by welding to increase the rigidity of the outer shell 6 together with the anti-radiation material. The horizontal girder 9 has a web 9a extending horizontally to almost the center of the double shell structure and a face plate 9 at the inner end thereof.
b, and the face plate 9b and the radial protection member 5 with the inner plate 4 are connected via struts 10 by fillet welding W having a standard leg length at a substantially central portion between the adjacent trans webs 8. . The tearing portion 15 that protects the inner shell 7 at the time of a collision is formed of a cutout formed in a connecting portion of the strut 10 to the face plate 5b of the inner shell anti-corrosion member 5, and a large compression such as a water pressure or a loading load. When a large tensile force acts on an adjacent portion due to a compressive force that can withstand the force but is locally concentrated, such as at the time of a collision, the inner shell 7 is separated from the strut 10 by tearing from the notch of the adjacent portion. I have.

In the second embodiment having the above configuration, FIG.
As in the first embodiment shown in FIG. 3, even if the bow of another ship collides with a large tanker having a double-walled side wall structure according to the present embodiment, the compression caused by the impact occurs. The outer shell 6 reinforced with a plurality of radial protection members and a horizontal girder 9 extending in the longitudinal direction of the ship against the force protects the inner shell 7 with maximum opposition, and at the same time, a large deformation due to a large impact, FIG. As shown in FIG. 5, even when the transmission is mainly made to the inner shell 7 via the transweb 8, the notch tearing portions 15 of the inboard connecting portions of the struts 10 on both sides of the transweb 8 are hit. The inner shell 7 which is pressed by the trans-web 8 is pulled and separated by pulling, and the inner shell 7 can be bent gently over a wide span, thereby preventing the occurrence of cracks due to local curvature having a large curvature. When a large deformation due to a large impact is mainly transmitted to the inner shell 7 through the horizontal girder 9 as shown in FIG. 3, the inboard shelves of the trans webs 8 on both sides of the horizontal girder 9. Notch tear part 12 of cruciform joint
However, the horizontal shell girder 9 and the strut 10 which are struck by the collision pull the inner shell 7 to be separated by tearing, so that the inner shell 7 can bend slowly over a wide span,
Prevent cracks due to local curvature with large curvature and prevent outflow of loaded oil.

In the first and second embodiments described above, the present invention is applied to the double shell structure of the side wall of a large tanker. However, the present invention is applied to the double shell structure of the ship bottom as shown in FIG. Needless to say, the invention can be applied to the double shell structure of the side wall of the chemical tanker and the double shell structure of the ship bottom.

In the second embodiment, the notch tear portion 1 is used.
Although 5 is formed on the connecting portion of the strut 10 to the face plate 5b of the inner shell anti-diaphragm 5, it is also formed on the strut 10 body close to the connecting portion.

In addition to the above-described embodiment, a tear portion formed by reducing the length of the welding leg and a tear portion formed by the notch may be appropriately connected to at least one of the cross joint of the shelf and the strut. It is possible to adopt a configuration in which the components are mixed in the vicinity of the unit and / or the connecting portion, and it is also possible to adopt a configuration in which the components are provided side by side.

[0027]

As described above, according to the double shell structure of the hull of the present invention, a shelf cross-joint having a strong tearing portion which is strong against compression but weak against tension is attached to the trans web and the tearing portion. At least one connecting part before and after the strut and at or near one of the connecting parts, respectively. (1) In particular, the hull weight is increased, the number of man-hours is increased, the construction cost is increased, and the loading capacity is reduced. Even if a collision occurs with a stranded ground or another ship, the shock is absorbed as much as possible by the highly rigid outer shell without restricting and causing problems such as an increase in horsepower and deterioration in maneuverability of the ship's impact propulsion (2) In addition, even if a large deformation reaches the inner shell due to collision, the inner shell is separated from the outer shell to prevent the large deformation of the outer shell from being transmitted to the inner shell,
The inner shell can be curved gently to prevent the inner shell from cracking, and to prevent the outflow of cargo such as loading oil from the ship.

According to a second aspect of the present invention, the tear portion of the cruciform joint is formed by reducing the length of the fillet welding leg between the transformer web and the shelf, and at least one of the connecting portions before and after the strut is formed. If the tearing portion is also configured with a shorter strut welding leg length, the tearing portion can be formed relatively easily by performing linear welding with a welding robot or the like.

According to a third aspect of the present invention, at least one of the connecting portion and the connecting portion and / or the connecting portion in the vicinity of the connecting portion and / or the connecting portion is formed with a notch. A tear portion can be formed in the opening, which is advantageous in the procedure, and the tear strength can be adjusted relatively easily by adjusting the size of the notch.

According to the fourth and fifth aspects of the present invention, the shelf cross joint is provided near the inner shell of the trans web, and at least one of the connecting portions before and after the strut and / or the tearing portion near the connecting portion is formed by the strut. When it is provided on the connection side between the outer shell and the inner shell-equipped anti-rust material, it is advantageous for maintaining the rigidity of the outer shell and the flexibility of the inner shell.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing a double shell structure on a port side wall of a large tanker according to a first embodiment of the present invention.

FIG. 2 is a horizontal sectional view showing a deformed state of the double shell structure when another vessel collides with the trans web at the level of the line of sight II-II in FIG.

FIG. 3 is a horizontal sectional view showing a deformed state of the double shell structure at the same level when the horizontal girder and the strut eb collide with each other.

FIG. 4 is an enlarged horizontal sectional view of an IV section in FIG. 2;

FIG. 5 is an enlarged horizontal sectional view of a portion V in FIG. 3;

FIG. 6 is a partial longitudinal sectional view of a double shell structure of a hull according to a second embodiment of the present invention, near an inner shell around a trans web.

FIG. 7 is a partial horizontal cross-sectional view of the double hull structure of the hull near the inner shell around the trans web.

FIG. 8 is a partial longitudinal sectional view of a hull of a double shell structure around a horizontal girder near an inner shell.

FIG. 9 is a partial longitudinal sectional view of the hull near the inner shell around a double shell structure horizontal girder.

FIG. 10 is a partial longitudinal sectional view showing a double shell structure on a port side wall of a large tanker according to a conventional example.

11 is a horizontal sectional view showing a deformed state of the double shell structure when another vessel collides with the trans web at the level of the arrow line XI-XI in FIG.

[Explanation of symbols]

 Reference Signs List 1 double shell structure of hull 3 outer plate 4 inner plate 5 radial protection material 6 outer shell 7 inner shell 8 trans web 9 horizontal girder 10 strut 11 shelf cross joint 12 tearing part (fillet welding with short leg length) 13 shelf board 15 Tear (notch) w Fillet welding with short leg length W Fillet welding with normal leg length

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-143187 (JP, A) JP-A-6-298161 (JP, A) JP-A-5-49591 (JP, U) JP-A-4-49591 48097 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B63B 3/20 B63B 3/68 B63B 25/08

Claims (5)

(57) [Claims] 1. An outer shell having a plurality of radial protection members extending in the longitudinal direction of the ship inside the outer plate, and an inner shell having a plurality of radial protection materials extending in the longitudinal direction of the inner plate outside the ship. Is a double shell structure of a hull constructed by connecting a plurality of transformer webs spaced apart in the longitudinal direction of the ship, the shelf having a tearing portion extending in the vertical direction of the ship and having a strong compression resistance but a weak tension. A cross joint is interposed in the transformer web, and a plurality of horizontal girder is provided on the inner side of the outer plate of the outer shell in a vertical direction of the ship, and the horizontal girder and the inner shell-mounted anti-rust material are connected to the trans web. A double shell structure for a hull, characterized in that struts are connected between the struts, and at least one of the joints before and after the struts is provided with a tear portion that is strong in compression but weak in tension. 2. The tearing portion of the shelf cross joint is formed by reducing a leg length of fillet welding between the transweb and the shelf, and the tearing portion of at least one of the connecting portions before and after the strut. The hull double shell structure according to claim 1, wherein the hull is configured to reduce the leg length of the strut weld. 3. The double shell of a hull according to claim 1, wherein the tear portion of the cross joint of the shelf and the tear portion of at least one of the connecting portions at the front and rear of the strut are formed by notches. Construction. 4. The double shell structure of a hull according to claim 1, wherein the shelf cross joint is provided near an inner shell of the trans web. 5. The hull according to claim 1, wherein the tearing portion of at least one of the connecting portions before and after the strut is provided on the connecting side between the strut and the inner-shell anti-shear material. Double shell structure.