JP2004299457A - Transverse material for vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transverse material for vessel serving also as an access trunk to a back face of an upper deck and being safe in terms of hull structure as well as maintenance work for solving all the inconveniences of a conventional access foothold. <P>SOLUTION: The transverse material for vessel is inserted from a longitudinal partition to each of the left and right sides of the vessel along the upper deck back face to separate from a cargo tank. The inside thereof is hollow having a width enough for a maintenance staff to pass through, and thus serving also as an access trunk to the upper deck back face. It is also characterized in that the cross-section surface of the transverse material has a trapezoidal shape widening toward the upper deck back face. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transformer material for a ship such as a tanker or a bulk carrier, and more particularly to a transformer material that also serves as an access trunk for maintenance.
[0002]
[Prior art]
In general, in a ship, a hold is partitioned by a longitudinal partition and a transverse partition. Girder and longitudinal members, which are reinforcement members in the longitudinal direction of the hull, are provided on the outer hull surface of the hull (the bottom of the hull, the side of the hull) and the underside of the upper deck.
Further, a floor member is provided as a reinforcing member in the height direction (ship side) or the lateral direction (ship bottom, upper deck), and has a lattice-like frame structure when viewed in plan.
[0003]
Further, a trans ring, which is a reinforcing material in the width direction of the ship, is provided at several places between the transverse bulkheads that partition the hold horizontally.
This transformer ring is composed of a vertical girder part erected along the vertical partition wall, and a horizontal girder part connected to the vertical girder part and laid horizontally along the backside of the upper deck. Since it is orthogonal to the reinforcing material in the direction, the reinforcing material in the vertical direction is penetrated.
[0004]
Incidentally, each part of such a hull (in the hold) requires maintenance for inspection and repair. In particular, since the transformer ring is welded to the underside of the upper deck and the side wall of the ship, and the vertical reinforcing member penetrates and is welded, maintenance of the weld is required.
For maintenance, the bottom and sides of the double hull structure are easily accessible, but the maintenance of the underside of the upper deck is very difficult.
[0005]
When performing maintenance on the underside of the upper deck, fill the hold with seawater and perform maintenance using a raft (boat) floating in the hold, or place a temporary scaffold on the underside of the upper deck along the horizontal girder of the trans ring. At present, it is suspended and maintained.
In any case, in such a method, the maintenance work is extremely large, and it is difficult to appropriately perform the maintenance.
[0006]
By the way, in recent years, ship accidents due to aging have increased, and environmental destruction due to the accidents has become an international problem. For this reason, the importance of annual inspection and maintenance of ships has been discussed at the International Maritime Organization, and as a result, permanent access to the underside of the upper deck has been required. In other words, it became necessary to provide a maintenance access fixed to the underside of the upper deck.
[0007]
However, when the access scaffold is fixedly provided, there are the following problems.
(1) Danger due to corrosion. In tankers, crude oil is loaded in the hold, so if the gas generated from the crude oil and the condensation on the underside of the upper deck due to the difference in the temperature during sailing are combined, an access scaffold will be installed. Places are exposed to severe corrosive environments. Since the access scaffold member has many welded portions and a structure having a small number of flat surfaces (plate materials) as compared with the structural material, the anticorrosion coating is difficult to apply and is easily corroded. For this reason, there is a higher risk of the access scaffold being eroded faster than the structure to be inspected.
[0008]
{Circle around (2)} In order to avoid the danger caused by the expansion and contraction of the hull structure and the above-mentioned corrosion, if the stiffness is set to the same level as that of the structural material, the access scaffold becomes locally very rigid. However, since the upper deck itself is a member that expands and contracts greatly depending on the state of the load, a rigid access scaffold may cause cracks. Also, if cracks occur, there is a risk of corrosion.
[0009]
(3) Danger due to sloshing. Due to regulations, only 98% of the capacity in the hold can be loaded. Therefore, depending on the weather conditions during navigation, the crude oil in the hold may be wavy (sloshing) and the access scaffolding may be severe. Risk of being beaten, damaged or cracked.
In addition, there is a risk of working at heights, and even if the inside of the hold is chemically cleaned and ventilated sufficiently, crude oil is generated on the backside of the upper deck, which is divided into a grid by longitudinal reinforcements and trans rings. It is pointed out that there is a risk that harmful gases may remain.
[0010]
[Patent Document 1]
JP-A-6-25098 (FIGS. 1 to 3)
[0011]
[Problems to be solved by the invention]
The present invention has been made to solve all the inconveniences of the access scaffold as described above, and has an access trunk to the backside of the upper deck, which is safe both in terms of hull structure and maintenance work. The purpose is to obtain a transformer material for a ship that also serves as a ship.
[0012]
[Means for Solving the Problems]
A transformer material of a ship, which runs along the back of the upper deck from the longitudinal bulkhead to each of the left and right ships, is isolated from the cargo tank, and has a hollow inside with enough space for maintenance personnel to be installed on the upper deck The manhole can be moved into and out of the hollow and the access trunk to the underside of the upper deck is also used.
It is also characterized in that the cross section of the transformer material has a trapezoidal shape extending toward the backside of the upper deck.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a hull provided with a transformer material according to the present invention, and FIG. 2 is a side cross-sectional view of a hull from the center.
[0014]
In the figure, 1 is a hull, 2 is an upper deck, 3 is a bottom of a double hull structure, and 4 is a side wall of a double hull structure.
Reference numeral 5 denotes a vertical partition wall which is arranged vertically in the longitudinal direction of the hold and partitions the hold in the vertical direction. Reference numeral 6 denotes a transverse partition wall which is disposed in the width direction of the hold and partitions the hold in the horizontal direction.
[0015]
Reference numeral 7 denotes a transformer material arranged along the rear surface of the upper deck 2 from the longitudinal bulkhead 5 to the left and right hull side walls 4, and serves as a reinforcing material in the width direction of the hull 1 between the transverse bulkheads 6, 6. Are installed in several places instead of conventional transformer rings.
Structurally, the transformer member 7 has a closed structure having a rectangular section in cross section having a ceiling on the back surface of the upper deck 2, a floor plate and side walls, and is completely isolated from the hold. The hollow inside of the transformer member 7 is large enough to allow maintenance personnel to pass through.
[0016]
Reference numeral 8 denotes a manhole provided on the upper deck 2 on the upper surface of the transformer material 7, and maintenance personnel can enter and exit the transformer material 7 from the manhole 8.
In the example shown in FIG. 2, the cross section of the transformer material 7 is formed in a trapezoid shape that spreads toward the back surface of the upper deck 2.
In the drawing, reference numeral 9 denotes a vertical reinforcing material, 10 denotes a back plate of the vertical partition wall 5, and 11 denotes a traffic passage in a hold provided on the transverse partition wall 6.
[0017]
The configuration of the present invention is as described above. Therefore, the maintenance personnel enters the hollow transformer member 7 from the manhole 8 and inspects the welding point between the transformer member 7 and the back surface of the upper deck 2 and the welding point between the vertical reinforcing member 9 from inside the transformer member 7. Maintenance will be required. At this time, inspection and maintenance can be performed by passing from the position of the vertical partition wall 5 to the position of the ship side wall 4.
In other words, the transformer member 7 is a reinforcing member in the width direction of the ship and also serves as a maintenance access trunk on the back surface of the upper deck 2.
[0018]
As described above, since the back surface of the upper deck 2 is maintained from within the transformer material 7, the maintenance can be performed whenever necessary.
In addition, since a necessary inspection tool can be brought into the transformer material 7, it is a matter of course that a welded portion on the outer surface of the transformer material 7 can be nondestructively inspected.
[0019]
In the example shown in FIG. 2, the cross section of the transformer material 7 is formed in a trapezoidal shape that spreads toward the back surface of the upper deck 2. In addition, the field of view of the foot of the transformer member 7 is widened, and maintenance becomes easy.
[0020]
【The invention's effect】
In the present invention, instead of the transformer ring, the inside is hollow and a transformer material also serving as a maintenance access trunk is used, so that an always fixed access trunk can be obtained. The access trunk is not affected by the load, the outer surface of the access trunk can be coated with anticorrosion, and corrosion can be suppressed.
In addition, the structure is isolated from the hold and is not affected by residual gas. In addition, work at height was eliminated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a hull provided with a transformer material according to the present invention.
FIG. 2 is a side sectional view of the side of the ship from the center.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hull 2 Upper deck 3 Ship bottom 4 Ship side wall 5 Longitudinal bulkhead 6 Transverse bulkhead 7 Transformer 8 Manhole 9 Vertical reinforcement 10 Back plate 11 Intersection in hold

Claims (2)

Along the backside of the upper deck, pass from the longitudinal bulkhead to each side of the ship, isolate from the cargo tank, make the inside hollow so that maintenance personnel can pass through, and enter and exit the hollow from the manhole provided on the upper deck A transformer material for a ship, characterized in that it can be used. 2. The transformer material for a ship according to claim 1, wherein a cross section of the transformer material is formed in a trapezoidal shape extending toward a back surface of the upper deck.

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