JPH06298162A - Corner part structure of hatch coaming - Google Patents

Abstract

PURPOSE:To prevent stress concentration and prevent stagnation of cargos and contact breakage of wire of a cargo handling grab. CONSTITUTION:At the corner part of an opening part 4 rectangularly formed on the upper deck 2, a cutout recessed part 7 cut out circular-arc-likely is formed outside the intersecting point C of respective sides 4a, 4b, and an inclined coaming part 8 of which the corner part of coaming materials 6A, 6B standingly provided along both sides 4a, 4b of the opening part 4 is spread from the upper end flange to the outside downward and connected to the outer circumferential edge of the cutout recessed part 7, is formed. Hereby, the curved radius of the opening part can be enlarged and inward projecting parts are eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a corner portion of hatch coaming provided around a cargo mouth of a bulk carrier type cargo carrier such as a bulk carrier (midship structure) at the mouth of a hold. .

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 3 and 4, a cargo hold opening 21 provided at the center of a hull is, for example, an upper deck 2
A hatch combing 26 composed of a pair of side combing materials 24 along the side deck 22a and a pair of end combing materials 25 along the cross deck 22b is provided in the opening 23 having a rectangular shape in plan view formed in 2. There is.
At the joint between the upper deck 22 and the hatch coaming 26, a narrow reinforcing portion 27 is projected into the opening 23 in the opening 23 of the upper deck 22, so that stress concentration on the corner portion of the opening 23 is concentrated. In order to alleviate the above, the corner member 28 in which the arcuate notch 28a having the radius r centered on the center point O on the center line L of the corner portion inside the opening 23 is formed is continuous to the reinforcing portion 27. It was projected. Reference numerals 29 and 30 denote side girders and end girders hanging down from the lower ends of the side combing material 24 and the end combing material 25.

[0003]

However, in the corner member 27, the stress concentration becomes smaller as the radius r of the cutout portion 27a becomes larger, but the amount of protrusion of the opening portion 23 to the inside becomes larger. There is a problem that the cargo tends to stay on the corner member 27 and the wire of the glove for cargo handling easily contacts the corner member 27, which increases the risk of damaging the corner member 27 and the wire of the grab.

The present invention solves the above problems and provides a corner structure for hatch coaming which can prevent the concentration of stress applied to the corners and prevent the accumulation of cargo and the damage of the wire of the grab for cargo handling. With the goal.

[0005]

In order to solve the above problems, the corner portion structure of the hatch coaming according to the present invention has a structure in which a corner portion of an opening formed in a rectangular shape on a deck has a circle outside the intersection of both sides. An angled combing is formed in which a notched recess cut out in an arc shape is formed, and a corner portion of the combing material that is erected upright along both sides of the opening spreads downward and outward from the upper end flange and is connected to the outer peripheral edge of the notched recess. It is formed on the part.

[0006]

According to the above construction, since the arc-shaped cutout recesses are formed outside the intersection of each side of the opening of the deck, the radius of the cutout recesses is formed in an arc shape which is in contact with each side as in the conventional case. It is possible to take a large amount in comparison with the above, and it is possible to significantly reduce the concentration of longitudinal bending stress applied in the bow-stern direction and bending stress applied in the cross-deck in the ship width direction. Moreover,
Since there is no member that protrudes inward from the opening at the corner, cargo does not stay and the wire of the cargo handling grab does not come into contact with and damage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of hatch combing according to the present invention will be described below with reference to the drawings. On the upper deck 2 above the hold located in the center of the hull, an opening 4 that forms a rectangular hold opening 3 is formed. In the opening 4, the edge portions along both sides 4a, 4b are formed in the reinforcing portions 5a, 5b, and from the side combing material 6A and the end combing material 6B hung vertically along both sides 4a, 4b. Hatch combing 6 is provided. The corners of the sides 4a and 4b of the opening 4 are formed on both sides 4a and 4b.
Outside the intersection C of the center point O on the middle line L of the corner
A notched recessed portion 7 is formed by cutting out in an arc shape having a radius R centering on the center of each side, and both ends of the notched recessed portion 7 are continuous to the respective sides 4a, 4b via convex connecting arc portions 7a, 7b. Has been done. Further, the corner portion of the hatch coaming 6 is formed in an inclined combing portion 8 which extends downward from the upper end flanges 6a and 6b and is connected to the outer peripheral edge of the cutout concave portion 7 while leaving an arcuate reinforcing portion 9.

The inclined combing portion 8 may have a curved surface shape, but in this embodiment, three triangular flat surface portions 8a and two rectangular flat surface portions 8b which are continuously bent and folded into a polyhedron through a folding line 8c. It is made of and facilitates its processing. In addition, the corner portions of the side girders 10A and the end girders 10B that are vertically provided below the side combins 6A and the end combing material 6B also have a corner girder 12 bent in a polygonal shape corresponding to the lower end joint portion of the inclined combing portion 8. It is provided.

According to the above-described embodiment, since the notch concave portion 7 having the radius R larger than that of the conventional notch portion 9 is formed at the corner portion of the opening 4, not only the longitudinal bending stress in the side deck 2a direction, It is possible to effectively alleviate stress concentration as much as the bending stress in the ship width direction along the cross deck 2b.
Moreover, since the notch recess 7 is located outside the inner edges of the upper end flanges 6a and 6b of the hatch coaming 6, the cargo does not stay and the wire of the grab used for cargo handling does not come into contact with it.

[0010]

As described above, according to the present invention, since the arcuate notch recesses are formed outside the intersection of each side of the opening of the deck, the radius of the notch recesses is different from the conventional one. It can be made larger than in the case of forming an arc shape in contact with the side, and the concentration of longitudinal bending stress applied to the bow-stern direction and bending stress applied to the cross deck in the ship width direction can be significantly relieved. Moreover, since there is no member projecting inward from the opening at the corner, cargo does not stay and the wire of the cargo handling grab does not come into contact with and be damaged.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a corner portion of hatch coaming according to the present invention.

FIG. 2 is a plan sectional view showing a corner portion of the hatch coaming.

FIG. 3 is a perspective view showing a corner portion of a conventional hatch combing.

FIG. 4 is a plan sectional view showing a corner portion of a conventional hatch coaming.

[Explanation of symbols] 2 Upper deck 3 Kuraguchi 4 Openings 4a, 4b Side 5 Reinforcing section 6 Hatch combing 6A Side combing material 6B End combing material 6a, 6b Top flange 7 Notch recessed section 8 Inclined combing section 8a Triangular plane section 8b Rectangular plane 8c Folding line 12 Corner girder L Corner midline C Side intersection O Side of arc of notched recess R Arc radius of notched recess

Claims (1)

[Claims] 1. A notched concave portion, which is cut out in an arc shape outside the intersection of both sides, is formed at a corner portion of the opening formed in a rectangular shape on the deck, and is erected along both sides of the opening portion. A corner portion structure of hatch coaming, characterized in that a corner portion of the combing material is formed into an inclined combing portion that extends downward from the upper end flange and is connected to the outer peripheral edge of the recess.