JP3737259B2 - Hatch cover manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a method of manufacturing a ship hatch cover.
[0002]
[Prior art]
Conventionally, in order to ensure the rigidity of the top plate of the hatch cover, reinforcing angle members, valve plates, flat bars, and the like are fixed to the back surface of the top plate at predetermined intervals by welding to increase the rigidity.
[0003]
FIG. 4 shows the angle member 11 fixed to the top plate 10 of the hatch cover by welding from the inside. Beam members called large bones 12 are arranged on the top plate 10 at a predetermined interval so as to be orthogonal to the angle member 11.
[0004]
In the penetrating portion 13 through which the angle member 11 penetrates the large bone 12, the side surface of the angle member 11 is joined to the large bone 12 by welding, and the inside of the L shape is a space. And about the space part, the angle material 11 is couple | bonded with the large bone 12 with the reinforcement board 14, and it is mutually integrated. The bottom surface of the angle member 11 is not directly coupled to the large bone 12 and is provided with a slot 15.
[0005]
[Problems to be solved by the invention]
The top plate 10 of the hatch cover is bent by seawater from above, the loaded cargo, and the load of the container. For this reason, for each region surrounded by the angle member 11 and the large bone 12, Compression is applied from the left and right in parallel with the top plate surface, and the top plate 10 may partially buckle.
[0006]
In order to give the top plate 10 a predetermined buckling strength, it is necessary to make the interval (pitch) between these angle members 11 as small as possible. Also for the portion to be performed, very laborious work such as welding of the reinforcing plate 14 is required.
[0007]
For this reason, the workability and productivity of the hatch cover are poor, and there is a limit to cost reduction.
[0008]
The present invention has been proposed to solve such problems.
[0009]
[Means for Solving the Problems]
In the hatch cover of a ship, a large bone is arranged at a predetermined interval on the back surface of the top plate, and a penetrating portion through which a U-shaped or V-shaped beam penetrates is provided in the large bone, and orthogonal to these large bones. A guide roller having a U-shaped or V-shaped cross section with a welding roller provided with an arm having a guide roller in contact with the inclined side surface of the U-shaped or V-shaped beam perpendicularly to the top plate. was allowed to abut against the inclined side surface, welded and fixed is moved parallel to the U-shaped or V-shaped beam, the the penetrations while being welded to the large bone in U-or V-shaped beam is inclined sides of both sides A gap is formed so as to face the bottom surface of the beam with a predetermined distance.
[0010]
[Action / Effect]
According to the present invention, the U-shaped or V-shaped beam penetrates the large bone and is welded to the large bone on the inclined side surfaces on both sides of the beam to form a predetermined gap on the bottom surface. Is unnecessary and welding can be performed easily. Especially for fillet welding along the abutting surface of the top plate and the inclined side surfaces on both sides of the beam, the guide reaction force that the welding roller of the welding machine receives during traveling does not cause one-side contact, etc. The welding machine can be accurately and efficiently performed without tilting. Moreover, since the box-shaped structure is formed by the U-shaped or V-shaped beam, the rigidity and buckling strength of the top plate are increased, and therefore, the arrangement pitch of the beams can be increased, and the number of welding points is reduced accordingly. Workability can be improved. In addition, since there is a gap that is not welded in a part of the penetrating portion, the hole shape of the penetrating portion does not need to have a very high fitting accuracy with the shape of the U-shaped or V-shaped beam. It is a factor that can improve the sex.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0012]
In FIG. 1, reference numeral 1 denotes a hatch opening, and a peripheral cover 2 is provided with a hatch cover 3 for opening and closing the opening 1. For example, a pair of hatch covers 3 form a cover, and a side rolling type and a pontoon type are known.
[0013]
The top plate 4 of the hatch cover 3 is fixed with a U-shaped or V-shaped beam 5 on the back side thereof by welding in parallel with each other at a predetermined pitch interval.
[0014]
The U-type or V-type beam 5 is fixed by fillet welding from the outside with the abutting surfaces of the inclined side surfaces 5b on both sides in a state where the opening surface 5a is in close contact with the top plate 4.
[0015]
When the U-shaped or V-shaped beam 5 is welded to the back surface of the top plate 4, it forms a box-shaped structure with the top plate 4, which has a buckling strength in a direction parallel to the surface of the top plate 4. In order to increase, the beam interval can be increased as compared with the conventional angle material.
[0016]
Large bones 7 (beam members) are arranged at predetermined intervals on the back surface of the top plate 4 perpendicular to the U-shaped or V-shaped beam 5.
[0017]
As shown in FIG. 2, a penetrating portion 8 is opened in the large bone 7 at a portion where the U-shaped or V-shaped beam 5 and the large bone 7 cross, and the U-shaped or V-shaped beam 5 penetrates through the large portion. ing. The shape of the penetrating portion 8 is generally formed in accordance with the cross-sectional shape of the U-shaped or V-shaped beam 5, and a gap 9 having a predetermined distance is formed between the beam bottom surface 5c. The inclined side surfaces 5b on both sides of the U-shaped or V-shaped beam 5 are welded to the large bone 7 at the penetrating portion 8, but the bottom surface 5c is left as a space without being welded.
[0018]
With this configuration, the U-shaped or V-shaped beam 5 is welded to the large bone 7 only at the beam inclined side surface 5b at the penetrating portion 8 that penetrates the large bone 7, so that welding work is easy. Thus, many can be automatically welded, and the workability is improved. Further, since both side surfaces 5b are welded, a conventional reinforcing plate is not required, and the welding operation is simplified accordingly.
[0019]
Further, since the box-shaped structure is formed by the U-shaped or V-shaped beam 5, the rigidity and buckling strength of the top plate 4 are increased, so that the arrangement pitch of the beams can be increased, and the welding location is also increased accordingly. This also leads to improved workability.
[0020]
In this case, since there is a gap 9 in a part of the penetrating portion 8, the shape of the hole of the penetrating portion 8 does not greatly increase the shape alignment accuracy except for the inclined side surfaces 5 b on both sides of the U-shaped or V-shaped beam 5. Even if it is not increased, it can be dealt with, and this is also a factor that can improve the workability.
[0021]
By the way, when fillet welding the U-shaped or V-shaped beam 5 to the top plate 4, fillet welding along the abutting surfaces of the inclined side surfaces 5 b on both sides is performed as shown in FIG. 3. When welding is performed with 20, welding can be performed accurately and efficiently.
[0022]
That is, in the welding machine 20, the guide arm 21 is bent so as to be orthogonal to the inclined surface of the inclined side surface 5b of the beam 5, and the guide roller 22 is in contact with the inclined side surface 5b perpendicularly. For this reason, the guide reaction force received by the guide roller 22 during traveling does not cause one-side contact or the like, and the welding machine 20 does not tilt during traveling, so that accurate and stable automatic fillet welding can be performed. When the guide roller 22 does not contact the inclined side surface 5b perpendicularly, the guide roller 22 receives an upward component force, the welding machine is inclined, and stable welding cannot be performed.
[0023]
In this example, the U-shaped or V-shaped beam 5 is used. However, the present invention is not limited to this, and a semicircular, trapezoidal, or rectangular cross-section beam may be partially opened. Of course it is good.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.
FIG. 2 is a perspective view of the main part.
FIG. 3 is a schematic configuration diagram of a welding machine.
FIG. 4 is a cross-sectional view of a conventional example.
[Explanation of symbols]
3 hatch cover 4 top plate 5 U-shaped or V-shaped beam 5b inclined side surface 7 large bone 8 penetration 9 gap

Claims (1)

In the hatch cover of a ship, large bones are arranged at predetermined intervals on the back surface of the top plate, and a penetrating portion through which a U-shaped or V-shaped beam penetrates is provided in the large bones, and the cross section is U-shaped perpendicular to these large bones. Alternatively, the guide roller is placed on the inclined side surface by a welding machine having an arm having a guide roller at the tip that makes the opening of the V-shaped beam closely contact the top plate of the V-shaped beam and makes contact with the inclined side surface of the U-shaped or V-shaped beam. by abutment, welding and fixed is moved parallel to the U-shaped or V-shaped beam, the the through portion together with U-shaped or V-shaped beam is welded to the large bone sloped side on both sides, and the beam bottom Is a method of manufacturing a hatch cover , wherein a gap is formed to confront each other at a predetermined distance .

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