JPS62214085A - Hull construction - Google Patents

Abstract

PURPOSE:To prevent stress concentration at the tie-in point of a longitudinal bulkhead and an inner bottom of a double hull by jointing the longitudinal bulkhead and the inner bottom of a double hull hold in an arc shape. CONSTITUTION:A wing tank portion comprises an upper deck block 1, a shell plate block 2, a bottom bilge tank and a longitudinal bulkhead block 4. A tie-in point of a longitudinal bulkhead 6 and an inner bottom 8 of a double hull 7 is formed in an arc shape. Therefore, strength against a bending in a longitudinal direction is increased and then a longe and a balancing which have been conventionally required can be abolished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the hull structure of a ship having wing tanks, such as an ore carrier, ore or oil carrier.

[Prior Art] The wing tank section of an ore carrier, ore and oil carrier has a structure as shown in FIG. 4, for example, as a cross-sectional view.

That is, it consisted of an upper deck block 1, a ship side shell block 2, a bottom bilge tank block 3, a longitudinal bulkhead block 4, and a lower longitudinal bulkhead block 12, which formed a wing tank 13. As shown in FIG. 5, a sloped part 14 is formed at the joint between the longitudinal bulkhead 6 and the inner bottom 8 of the double hold 7, and this sloped part 14 is similar to the other parts. A considerable number of longi 10 were placed in the area.

In addition, the longitudinal bulkhead and double bottom members intersect with each other at this joint, and in order to relieve the stress concentrated at the double bottom end, as shown in Figure 6, Balancing 1
5 has been extended.

It is already known that there are problems such as stress concentration at this joint and the large number of members, and methods such as fixing the girder directly to the knuckle points have been proposed as a solution to these problems (especially Publication No. 60-8184).

[Problem to be solved by the invention 1 As mentioned above, there is stress concentration at the joint between the longitudinal bulkhead and the inner bottom of the double bottom, so a large number of members are used in this part, and the construction is time-consuming. There was a problem that it took a while. The method of fixing the girder directly to the knuckle point improved this problem, but it also simplified the structure, reduced the number of parts,
It was hoped that the strength would be improved and the construction work simplified accordingly.

Means for Solving Problems U] The present invention has been made to solve these problems, and achieves this purpose by connecting the longitudinal bulkhead and the inner bottom of the double-bottom hold in an arc shape. This has been achieved.

The arcuate portion is a portion where the longitudinal partition wall and the inner bottom of the double bottom join, and which is conventionally formed at an angle. The diameter of the circular arc may be such that it rises from the vicinity of the base of the conventional inclined portion. By making it arcuate, the bending strength in the longitudinal direction is increased, and the longitudinal portion of the arcuate portion becomes unnecessary. Further, since the longitudinal bulkhead and the inner bottom of the double bottom are continuously connected by a steel plate, a balancing member is not required. The arcuate section can be incorporated into the bottom bilge tank block, eliminating the need for a conventional lower longitudinal bulkhead block.

[Function] By connecting the longitudinal partition wall and the inner bottom of the double bottom in an arc shape, stress concentrated at this joint is dispersed. Moreover, the strength in the longitudinal direction of this joint is also increased.

On the other hand, cargo remains more easily than in the inclined type. However, even in conventional bulk ships, the front wall of the engine room, the bow bulkhead, etc. are vertical walls, and the degree of residual damage is smaller than these. Moreover, since the final stage of unloading is usually scraping out with a bulldozer, this is not a problem.

[Example] FIG. 1 is a cross-sectional view showing the hull structure of a wing tank section that is an example of the present invention. The wing tank section consists of an upper deck block 1, a side shell block 2, a bottom bilge tank block 3, and a longitudinal bulkhead block 4.

The conventional lower longitudinal bulkhead block 5 shown by dotted lines in the figure is divided into two parts, the upper part of which is absorbed into the longitudinal bulkhead block 4 and the lower part absorbed into the bottom bilge tank block 3.

As shown in FIG. 2, an enlarged view of the connecting portion 9 between the vertical partition wall 6 and the inner bottom 8 of the double bottom 7, the connecting portion (arc-shaped portion) 9 is formed in an arc shape and has a longitudinal shape. 10 is not provided. Incidentally, the arcuate dotted line in FIG. 2 indicates the position of the arcuate portion 9 when the intermediate floor surface is lowered.

The bottom bilge tank block 3, as shown in FIG.
It is assembled by welding the longitudinal 10 and the floor 12 to the bottom shell 11, and then welding the arcuate portion 9 together with other surface materials to predetermined locations. The procedure for loading and assembling blocks is to first load the double bottom block 7, then load and assemble the bottom bilge tank block 3, longitudinal bulkhead block 4, side shell block 2, and upper deck block 1 in this order. Bye.

[Effects of the Invention] With the structure of the present invention, it was possible to improve the tightness of the connecting portion between the longitudinal bulkhead and the inner bottom of the double bottom, and to eliminate longitudinal, balancing, etc. in this portion. This reduces the number of parts,
Furthermore, the number of blocks could be reduced, reducing the number of steps and making work easier. It was also possible to reduce the amount of steel used, leading to overall cost reductions.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the hull structure of the wing tongue section which is an embodiment of the present invention, and Fig. 2 is a cross-sectional view of the area around the joint between the longitudinal bulkhead and the inner bottom of the double bottom. It is an enlarged view. FIG. 3 is a perspective view showing the assembled state of this joint. FIG. 4 is a cross-sectional view showing the hull structure of a conventional wing tank section, and FIG. 5 is an enlarged view of the area around the joint between the longitudinal bulkhead and the inner bottom of the double bottom. FIG. 6 shows the balancing material. 6... Longitudinal bulkhead, 8... Inner bottom, 9... Arc-shaped part,
13...Wing tank

Claims (1)

[Claims] Hull structure of a ship having a wing tank formed by connecting the wing tank longitudinal bulkhead and the inner bottom of a double-bottom hold in an arc shape.