JPH0452151Y2 - - Google Patents

Description

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

BACKGROUND TECHNOLOGY The structure of the fixing portion between the upper deck transverse beam and the upper wing tank will be explained based on FIG. 6. Reference numeral 1 designates an inner plate of the upper wing tank 2 in the bow and stern direction, which stands up vertically at the upper part of the tank 2 and is fixed to the lower surface of the upper deck 3 at right angles. Reference numeral 4 denotes an upper deck cross beam provided on the upper surface of the upper deck 3, and is arranged directly above the horizontal frame 5 in the upper wing tank 2 in correspondence with it. 6 is a bracket;
It is arranged on the upper surface of the upper deck 3 on the extension line of the inner board 1,
It is fixed to the web of the upper deck 3 and the upper deck transverse beam 4.

Problems to be Solved by the Invention According to the above conventional configuration, stress concentration occurs at point A where the inner plate 1 and the upper deck transverse beam 4 intersect due to the shape, but in addition, the torsion of the upper wing tank The reaction force flowing from the inner plate to point A due to rigidity acts to promote this, and as shown in Figure 6, BA
Even if the brackets 6 are provided in the direction of the extension line and fixed to the upper deck 3 on the inner plate 1 and the web of the upper deck transverse beam 4 for strength reinforcement, there is a problem that stress concentration cannot be avoided. Ta.

The present invention is intended to solve the above problems, and aims to provide a hull structure that can reduce the stress concentration on the upper deck transverse beam due to the inner plate of the upper wing tank and significantly reduce the applied stress. .

Means for Solving the Problems In order to solve the above problems, the present invention provides a ship with an upper wing tank and an upper deck transverse beam provided on the upper surface of the upper deck. The plate is inclined so that the upper end of the plate is positioned inward in the ship width direction and is fixed to the lower surface of the upper deck, and on the extension line of the inclination direction of the inner plate, a bracket inclined in the same direction is attached to the upper deck and the upper deck transverse girder. The structure is such that it is fixed to the web of the web.

Effect In the above configuration, by tilting the inner plate and arranging the bracket on the extension line thereof, the concentrated stress applied to the lower end of the upper deck transverse beam by the inner plate is reduced along the two directions of the inclined bracket and the upper deck. The stress is effectively distributed, the applied stress is significantly reduced and the concentrated stress is relaxed.

Embodiment An embodiment of the present invention will be described below based on the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a view taken along the line X--X in FIG. 1, and FIG. 3 is a view taken along the Y-Y arrow in FIG. In Figures 1 to 3,
11 is the inner plate of the upper wing tank 12;
It is fixed to the lower surface of the upper deck 13 at an inclination angle θ. Reference numeral 14 denotes an upper deck cross beam provided on the upper surface of the upper deck 13, and is arranged directly above the horizontal frame 15 in the upper wing tank 12. Reference numeral 16 denotes a bracket provided on the upper deck 13, which is arranged on an extension line of the inclination direction of the inner plate 11 so as to be inclined in the same direction, and is fixed to the webs of the upper deck 13 and the upper deck transverse beam 14.

In the above configuration, the concentrated stress applied to the lower end of the upper deck transverse beam 14 by the inner plate 11 acts in an angular direction between the vertical line and the horizontal line, and is applied on the extension line of the inner plate 11 that is inclined at an inclination angle θ. Since the stress is effectively distributed along the surface of the bracket 16 and upper deck 13 which are inclined in the same direction, the applied stress is significantly reduced and the concentrated stress is alleviated compared to the case of a conventional vertical bracket. angle θ
The larger the obtuse angle, the greater the degree.

FIGS. 4a and 4b show the analysis results of local principal stress in the upper deck transverse beam 14 and the transverse frame 15 around point A in an embodiment of the present invention and a conventional structure. As shown in Figure 4b, the concentrated stress around point A is inclined at an angle of approximately 45° with respect to the horizontal line. The linear bracket reduces the local principal stress around point A, and the maximum value in the conventional upper deck transverse beam was 31 kg/mm ² , but in the present invention it has been reduced to 21 kg/mm ² .

Figure 5 shows the principal stress distribution at the lower end of the upper deck transverse beam (joint part with the upper deck) in both structures, centered on point A. The vertical axis shows the principal stress σ and the standard descending stress σ of the steel material. It is expressed by taking the ratio with _Y ,
The solid line shows the characteristic curve of the conventional structure, and the broken line shows the characteristic curve of the structure of the present invention. As is clear from FIG. 5, the curve of the structure of the present invention shows a decrease in the principal stress at point A and the lower end of the upper deck transverse beam near point A, compared to the curve of the conventional structure.

Effects of the Invention As described above, according to the structure of the present invention, the inner plate of the upper wing tank is inclined, and the bracket is provided at an angle on the extension line, and is fixed to the web of the upper deck transverse beam. The concentrated stress applied to the lower end of the upper deck transverse beam is distributed and relieved along the inclined bracket.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is the X-X arrow view in Figure 1, and the figure 3 is Y in Figure 2.
-Y arrow view, Figures 4a and b are analytical diagrams of local principal stress around point A in the present invention and the conventional example, Figure 5
The figure is a principal stress distribution diagram of the lower end of the upper deck transverse beam in the present invention and the conventional example, and FIG. 6 is a perspective view showing the conventional structure. 11...Inner plate, 12...Upper wing tank, 13...Upper deck, 14...Upper deck transverse beam, 15
...Horizontal frame, 16...Bracket.

Claims (1)

[Scope of utility model registration request] In a ship having an upper wing tank and having an upper deck transverse beam provided on the upper surface of the upper deck, the inner plate of the upper wing tank is inclined so that the upper end of the inner plate is positioned inward in the ship width direction to improve the lower surface of the upper deck. A hull structure characterized in that a bracket is fixed to the upper deck and the web of the upper deck transverse beam and provided on an extension line of the inclination direction of the inner plate and inclined in the same direction.