JPH052399Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to ship structure.

Structure of conventional example and its problems When a ship is sailing, its hull is subjected to various forces, such as vertical bending moment and torsional force on the hull itself, water pressure on the bottom skin and side skin, and water pressure on the hull ( (oil storage) The load due to the weight of cargo oil acts on the inner bottom plate and side walls. In order to cope with such various forces, for example, in a product carrier, at least one of the ship side part 2, bottom part 3 and upper deck part 4 around the oil storage 1 is used, as shown in FIGS. 1 and 2. , the ship side part 2 and the ship bottom part 3, the hull outer plating 5, the hull internal board 6, longitudinal members in the bow and stern direction (longitudinal materials, girders, etc.) 7, and transverse members in the ship width direction (transformer materials, floor materials, etc.) >> (not shown).

According to this configuration, since the longitudinal members 7 and the transverse members are provided to intersect with each other, automation of work during ship construction, particularly automation of welding, is hindered. In addition, as shown in Figure 3a, the distance between the longitudinal members 7 of the hull plating 6 is s, the thickness is t, and the bending moment and shear applied to the hull plating 6 when a uniform load w is applied. The forces are as shown in b and c in Figure 3, and the bending moment applied to the center is particularly small compared to the bending moment applied to the edges. Therefore, it is necessary to increase the wall thickness near the longitudinal members 7 of the hull plating 6, but the wall thickness elsewhere may be small, and the inner plating 6 of uniform thickness as described above is used. This is uneconomical. The same can be said of the hull outer plate 5.

Purpose of the invention The purpose of the present invention is to provide a hull structure that eliminates the above-mentioned conventional drawbacks.

Structure of the Invention In order to achieve the above object, the hull structure of the present invention is constructed of a double-structured plate material consisting only of a large number of section steels with the side edges of opposing face members welded to each other. In addition to forming the entire or main part of the bottom, the side edges of the face material of the section steel are formed to be thinner than the center.

Embodiment and Operation A first embodiment of the present invention will be described below with reference to FIGS. 4 to 7. In FIG. 4, reference numeral 9 denotes a double-structured plate body, with face members 10A facing each other,
It is composed only of a large number of I-section steels 10 whose side edges 10B are welded together. Further, as shown in FIG. 6, the thickness t ₁ at the center of the face members 10A, 10B of each I-beam 10 is made larger than the thickness t ₂ at the side edges thereof. Furthermore, as shown in FIG. 5, the plate 9 forms all or the main parts of the ship's side part 2 and the ship's bottom part 3 around the hold 1. Reference numeral 12 denotes a ship side corner, which includes an arc-shaped hull inner board 13 and a hull outer board 14.
and a longitudinal member 15 connecting the inner and outer panels 13 and 14.
The side edges of the inner and outer plates 13 and 14 are welded to the side edges of the opposing face plates 10A and 10B, respectively.
1 and get warped. 16 is a passage hole.

Hereinafter, the effects of the above configuration will be explained. As shown in Fig. 7a, the distance between the webs 10C of the I-beam 10 is s, and when a uniform load w is applied, the bending moment and shear force applied to the face plates 10A and 10B are as shown in Fig. 7b. As shown in FIG. 7c, the bending stress distribution is equalized, and as a result, the amount of the face materials 10A and 10B can be reduced by the shaded area in FIG. 7a. Moreover, it is sufficient to weld 11 the side edges of the opposing face materials 10A and 10B, and the welding length can be significantly reduced compared to the conventional method.

In the above embodiment, the plate 9 is made of an I-shaped steel 10, but in addition to this, a shaped steel 20 formed by welding three T-shaped steels 17, 18, and 19 to each other may be used, for example, as shown in FIG. Alternatively, as shown in FIG. 10, a steel section 22 formed by welding together two T-shaped steels 17 and 18 and one U-shaped steel 21 may be May be used. (3rd
example). In short, any shape steel that can form the plate body 9 with a double structure may be used. Furthermore, the 8th
The protrusion 19A of the central T-shaped steel 19 in the figure and the protrusion 21A of the U-shaped steel 21 in FIG. 9 serve as stiffeners.

Effects of the invention As described above, according to the invention, since the double-structure plate forming the whole or main part of the ship's side and bottom is constructed from only a large number of section steels, the section steels are welded together. The welding length can be significantly reduced compared to conventional methods, and the construction period can be shortened. In addition, since the side edges of the face material of the above-mentioned section steel are made thinner than the center, the bending stress applied to the face material is equalized,
This allows the amount of steel material to be reduced.

[Brief explanation of drawings]

1 to 3 show a conventional example, in which FIG. 1 is a cross-sectional view, FIG. 2 is a cross-sectional view of a main part, and FIGS. 3a to 3c are diagrams of bending moment and shear force when a uniform load is applied between the longitudinal members of the inner hull plate.
FIG. 7 shows a first embodiment of the present invention, FIG. 4 is a cross-sectional view of the plate, FIG. 5 is a cross-sectional view of the main part of the hull,
Fig. 6 is a perspective view of an I-beam, Figs. 7a-7c are diagrams of bending stress and shear force when a uniform load is applied to the surface material between the webs. Fig. 8 is a cross-sectional view of the main part showing the second embodiment of the present invention, and Fig. 9 is a cross-sectional view of the main part showing the second embodiment of the present invention. 1...oil hold, 2...ship side, 3...ship bottom, 9
...Plate, 10...I-beam, 10A, 10B...
Surface material, 11...welding, 20, 22...structural steel.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. At least all or the main parts of the ship's side and bottom parts around the hold are covered by a double-structured plate material made only of a large number of section steels, the side edges of which are facing each other are welded together. A hull structure characterized in that the side edges of the face members of the section steel are formed thinner than the center thereof. 2. The hull structure according to claim 1 of the utility model registration claim, characterized in that the section steel is an I section steel.