JPS6031990Y2 - Thin box-shaped structure on the upper deck of a cargo ship - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a thin plate box-shaped structure that is newly installed on the upper deck of a cargo ship such as a car carrier and has a plurality of internal decks.

Currently, existing bulk carriers and the like are being converted into car carriers.

In this case, as shown in FIGS. 1 and 2, a thin plate box-shaped structure 4 having a plurality of internal decks 3 is built on the upper deck 2 of the cargo ship 1.
will be newly established.

Here, since the hull is subjected to vertical bending due to waves, the thin plate box-shaped structure 4 is provided with expansion joints 5 at about two locations to absorb expansion and contraction in the direction of travel of the hull.

This expansion joint 5 is made of steel and has an inwardly recessed cross-section, and is designed to close the notches formed in the uppermost deck 4A and the side outer plates 4B at right angles to the direction of movement of the hull.

Further, as shown in FIG. 3, the lower end portions of the side outer plates 4B of this expansion joint 5 are connected.

However, in the case of the thin plate box-shaped structure 4 having such a configuration, expansion and contraction due to vertical bending cannot be sufficiently absorbed, and many cracks occur in the connecting portions at the lower ends of the expansion joints 5 and the side outer panels 4B. There is.

This idea was devised in view of these circumstances,
The purpose is to provide a thin plate box-shaped structure that is free from cracks.

The thin plate box-shaped structure according to this invention has a continuous slit formed in the side outer plate and the top deck perpendicular to the direction of hull movement to absorb deformation caused by vertical bending, and the side outer plate The slit stop end at the bottom of the slit is a circular hole continuous with the slit to prevent cracks from forming at this stop end, and the top deck and side skin are further provided with a bar surrounding the entire length of the hole and slit. At the same time as welding, a plate-shaped expansion joint is bolted across the bar material, so that holes and slits are reliably and watertightly closed by simple means.

This invention will be explained below based on an illustrated embodiment.

Note that parts that are the same as or correspond to those in the prior art are given the same reference numerals, and description thereof will be omitted.

As shown in FIG. 4, the thin plate box-shaped structure 6 according to this invention has a continuous slit 7 in its uppermost deck 6A and side outer plate 6B, which is perpendicular to the direction of movement of the ship.

The slit in the side outer plate 6B is designed to gradually narrow downward as the deformation of the structure 6 decreases downward.

Furthermore, the slit stop end at the lower part of the side outer plate 6B is a circular hole 8 that is continuous with the slit 7.

A plurality of such slits 7 are provided depending on the length of the thin plate box-shaped structure 6, and can absorb deformation due to vertical bending.

Further, the stopping end of the slit 7 is a circular hole 8, which is deformed by vertical bending, and the connecting portion 6C at the lower part of the side outer plate 6B.
The external force acting on the structure can be alleviated and the occurrence of cracks can be prevented.

Furthermore, the slit 7 is covered with a rubber expansion joint 9 to prevent rainwater from entering.

A bar 10 is welded around the slit 7 on the outer surface so as to continuously surround the slit 7 and the hole 8.
A plate-shaped expansion joint 9 with a predetermined width as shown in FIGS.
is attached to the top deck 6A and side outer plate 6B by bolts and nuts 11 at its ends, thereby opening the slit 7.
will be sealed watertight.

Further, the expansion joint 9 is configured such that its central portion is curved outward to absorb vertical bending.

As mentioned above, the thin plate box-shaped structure according to this invention has a continuous slit in the side skin and the top deck that is perpendicular to the direction of hull movement, and the slit stopping end at the bottom of the side skin The circular hole continuous to the slit prevents the generation of excessive stress due to vertical bending deformation, eliminating the racking that occurs in the conventional case and also causing cracks in the connecting part of the side outer plate at the end of the slit stop. There's nothing to do.

Furthermore, a bar surrounding the entire length of the holes and slits is welded to the top deck and side panels, and a plate-shaped expansion joint is bolted across the bars to ensure that the holes and slits are watertight with a simple method. can be blocked.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a car carrier equipped with a conventional thin plate box-shaped structure, Fig. 2 is a plan view taken along line I-■ in Fig. 1, and Fig. 3 is a thin plate box-shaped structure in Fig. 1. 4 is a perspective view showing the thin plate box-shaped structure according to the invention, FIG. 5 is a cross-sectional view of the upper part of the side outer plate, and FIG. 6 is a similar cross-sectional view of the middle part. FIG. 7 is a similar cross-sectional view of the lower part. 1... Cargo ship, 2... Upper deck, 3...
... Deck, 4... Thin board box-shaped structure, 4A.
...Top deck, 4B...Side outer board, 5...
...Expansion joint, 6...Thin plate box-shaped structure, 6
A...Top deck, 6B...Side outer plate, 6
C...Connection part, 7...Slit, 8.
...Circular hole, 9...Rubber expansion joint, 10...Bar material, 11...Bolt/nut.

Claims (1)

[Scope of utility model registration request] A thin plate box-shaped structure consisting of multiple decks installed on the upper deck of a cargo ship and outer panels that cover these decks and form a box shape, with a continuous slit in the side outer panels and the top deck. is formed to be perpendicular to the direction of hull movement, and the slit stopping end at the bottom of the side shell plate is a slot-shaped hole continuous to this slit, and the entire length of the hole and slit is formed on the top deck and side shell plate. A thin plate box-shaped structure on the upper deck of a cargo ship, characterized in that a bar surrounding the bar is welded and a plate-shaped expansion joint is bolted across the bar.