Hatch coaming partially numbered in total strength and hatchway stringer for bulk cargo ship

Abstract

The invention discloses a hatch coaming partially numbered in total strength and a hatchway stringer for a bulk cargo ship. The hatch coaming partially numbered in the total strength and the hatchway stringer for the bulk cargo ship comprise a longitudinal hatch coaming and a hatch stringer, wherein the longitudinal hatch coaming comprises an upper coaming and a lower coaming; the upper coaming and the lower coaming are of a detachable structure; the lower end surface of the upper coaming is fixedly connected with the upper end surface of the lower coaming; the lower coaming is continuous in a ship-length direction; the upper coaming is broken at a transverse bulkhead; the material elastic yield limit of the longitudinal hatch coaming is increased by 10% relative to that of a main deck; the height of the lower coaming is 600 mm or below; the height of the hatch stringer is less than that of a conventional hatch stringer. The hatch coaming partially numbered in the total strength and the hatchway stringer for the bulk cargo ship can promote the structural stiffness of a ship-body beam, improves the fatigue life of a hatch corner, and increases the cubage of a cargo hold; moreover, the structural weight of a longitudinal component in a cargo-hold area is averagely decreased by 2.5% or above.

Description

technical field [0001] The invention relates to the technical field of hatch coaming, in particular to a bulk carrier hatch coaming and a ship's girder. Background technique [0002] The longitudinal hatch coamings of traditional bulk carriers are generally designed as a discontinuous structural type, and the total longitudinal strength of the hull girder cannot be included in the calculation of the rules. The reality is that the hatch coamings contribute a small part to the overall strength, which is too conservative compared to reality for the main hull structure and dangerous for the hatch coamings themselves. In addition, the height of the hatch girders of traditional small and medium-sized bulk carriers is generally too high, which causes the entire topside tank sloping plate to be slightly closer to the neutral axis, and at the same time loses part of the cargo hold volume. Contents of the invention [0003] In view of the above-mentioned problems, the object of the...

AI Technical Summary

Problems solved by technology

[0002] The longitudinal hatch coamings of traditional bulk carriers are generally designed as a discontinuous structure, and the total longitudinal strength of the hull girder cannot be included in the calculation of the rules

The reality is that the hatch coamings have a small part to contribute to the overall strength, which is too conservative for the main hull structure compared to reality, and dangerous for the hatch coamings themselves

In addition, the height of the hatch girders of traditional small and medium-sized bulk carriers is generally too high, resulting in the entire topside tank sloping plate being slightly closer to the neutral axis, and at the same time losing part of the cargo hold volume

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