JPH11139382A - Method for painting ballast tank of ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with the work of repairing the burned-out part of a paint film on a painted part by performing inboard hot work, etc. SOLUTION: The upper inner surface part 7a of a side shell and the outer surface part 8a of a side block 8, which will take high positions in a ballast tank that require scaffolding for inboard painting, are painted using a low grinding/polishing/cleaning type tar epoxy paint while being laid on their sides on the ground. Next, after the ballast tank is constructed and inboard hot work or the like is complete, the inner painted surface of the ballast tank other than the parts painted on the ground is painted at a time inside the ship. This inboard painting is performed by painting the low grinding/polishing/ cleaning type tar epoxy paint at a time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for painting a ballast tank mainly used for painting a ballast tank having a double bottom portion among ballast tanks when building a ship having a double shell structure.

[0002]

2. Description of the Related Art Ships are in an extremely severe corrosive environment as compared with general onshore structures. That is, each structural member of the hull is in an environment that is extremely susceptible to corrosion due to the influence of seawater, high temperature, high humidity, and the like. Particularly, the ballast tank uses seawater as a ballast, and thus is under severe corrosion.

[0003] Of the ballast tanks, a ballast tank 1 having a double bottom portion has a double bottom structure as shown in FIGS. 3 (a) and 3 (b). An inner bottom plate 4 is mounted inside the board 3 via a plurality of reinforcing members 5 extending in the bow and stern directions and a plurality of reinforcing members 6 extending in the sideward direction. Hole 1
1 is formed so that ballast water can flow in and out, and on both sides, a ship-side outer plate 7 as an SL block is erected on the ship bottom outer plate 3, and inside and outside of the ship-side inner plate 9. A side block (LT block) 8 to which a large number of triangular reinforcing members 10 are attached is assembled so that the reinforcing members 10 are on the outside, and ballast water can flow to and from the ship-side inner plate 9 of the blocks 8. In this manner, the distance between the bottom shell 3 and the bottom shell 4 and the side shell 7 serving as the SL block is equal to L.
It is formed between the T block 8.

Conventionally, the ballast tank 1 which is easily corroded has been coated with an epoxy resin paint such as a tar epoxy paint. This tar epoxy paint requires a very high grade base treatment such as completely removing rust on the painted surface at the time of painting, and when it can not meet the required grade, it fully demonstrates the performance as a coating film You cannot do it.

Conventionally, about 90% of the paint is applied on the ground with good workability, and the remaining one is on the ship with poor workability.
The ballast tank 1 was painted at a rate of about 0%.

More specifically, when building a hull by combining individual blocks assembled on the ground in a dock, the ballast tank 1 is mounted on the ship side as an SL block as shown in FIGS. The outer panel 7, the side blocks 8, and the bottom 2 are divided into central and side blocks 2a and 2b, which are individually assembled on the ground. After assembling the blocks on the ground, workability is good. On the ground, approximately 90% of the so-called ground coating, in which a high-grade groundwork is applied to the painted surface of each block, and then tar epoxy paint is applied over substantially the entire surface, and then the painted block 2 of the ship bottom 2 is applied. The joints A are welded by abutting the joints 2a and 2b in the dock, and a joint B between the ship side outer plate 7 and the ship bottom outer plate 3 as an SL block, a block 8 and a ship side outer plate 7, and a block. In order to build the ballast tank 1 by welding the joints C and D with the b, and after the construction, in a ship with poor workability, repainting of the welded portion and the like are applied to a limited portion, so-called shipboard painting. About 10% went.

[0007]

However, in the above-mentioned conventional method of coating the ballast tank 1, the ground coating is mainly performed because the high-grade groundwork is performed on the ground with good workability. Since the blocks will be welded on board, the heat applied during the welding will burn and damage the ground-painted coating and generate dirt. Repairing after roughening and chamfering of the coating film with tools is necessary, and cleaning of dirt is required, so much later work is required, and labor and work time are increased. There is a problem that the cost required for painting the ballast tank 1 increases.

Accordingly, the present invention is to provide a method for painting a ballast tank for a ship, which can eliminate a conventional work requiring a lot of labor and time, such as repair of a burnt portion of a coating film and removal of dirt. Things.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, after a double-bottom ballast tank is constructed, a scaffold is required when painting the inside of the ballast tank. When only the parts that will be in place are to be assembled on the ground by blocking each part of the ballast tank on the ground, apply low-cleaning type tar epoxy paint to the ground,
Then, after assembling the blocks assembled on the ground to build the above ballast tank, performing fire work inside the ship, etc. Is a method of performing in-vessel painting in which batch painting is performed onboard and painting in a ballast tank.

[0010] Since the ballast tank is coated using a low-cleaning type tar epoxy paint, it is not necessary to perform a high-grade base treatment, and a simple base treatment is performed even on a ship with poor workability. Only the part that requires the inboard scaffold is limited to the part where the ground coating is performed, and only that part is previously painted on the ground, so that the ground coating is small and the construction work can be performed immediately. Therefore, when building a ballast tank by welding a plurality of blocks, it is possible to eliminate the burning and dirt of the coating film, and it is possible to omit the subsequent work such as repairing the burnt portion of the coating film and removing the dirt. it can.

In addition, by applying a brush-coated stripe coat prior to spray coating on all welded parts and narrow parts such as corners and corners, the welded parts, corners and edges caused by the fact that rust is not removed by a simple base treatment. It is possible to eliminate the possibility that the paint does not penetrate well into narrow portions such as corners.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 (a), 1 (b) and 3 (c) show an embodiment of the method for painting a ballast tank of a ship according to the present invention, which is the same as that shown in FIGS. 3 (a) (b) (c). When the ballast tank 1 at the bottom is coated, the ballast tank 1 having the same configuration as that shown in FIG. 3A is divided into a ship side outer plate 7 as an SL block, a block 8 as an LT block, and a divided block of the ship bottom 2. After assembling and constructing 2a and 2b, painting work is carried out collectively on the ship, so that the painting inside the ship is increased to about 80%, and the remaining about 20% is to be painted on the ground. It is necessary to minimize the subsequent work associated with the burnout of the coating film.

The places where the ground coating is performed by the coating method of the present invention are the inner surface of the upper side 7a of the ship side outer plate 7 and the LT block as SL blocks which are located at a high position where a scaffold is required after the ballast tank 1 is constructed. Block 8 as
The outer surface of the upper part 8a of the above is used as the ground coating when assembling on the ground, and the other parts are painted as ballast tanks 1 on the ship at once after construction.

For this purpose, in the coating method of the present invention, a special resin such as a low molecular petroleum resin or fish oil is blended as a penetrant instead of the conventional tar epoxy paint, and penetrates deep into the rust layer to form a rust layer. Contains an amine-based resin that can penetrate and stabilize and fix the particles, and a water-reactive amine-based resin. Dehydration ability to be able to perform dehydration and a special epoxy resin that reacts with rust to form a chelate wraps rust, and gradually converts the wrapped rust into stable black iron (Fe ₃ O ₄ ). Use a so-called low scouring type tar epoxy paint which has chelate convertibility and further has magnetite convertibility of converting red rust into stable magnetite using a ferromagnetic pigment. This low-cleaning tar epoxy paint has the characteristic that it can be applied directly on rust. Therefore, when the low-cleaning tar epoxy paint is applied, the surface to be coated has rust. However, the coating can be performed only by a sweeping cleaning and a simple base treatment that removes oil and moisture without completely removing the rust.

Next, the method of coating the ballast tank 1 of the present invention will be described in detail. First, as shown in FIG. 1 is placed on the ground sideways as shown in FIG. 1 (b), and a low scouring type tar is applied to the outside of the upper portion 8a of the block 8, that is, the surface which becomes the inner surface of the ballast tank 1. Paint using an epoxy paint.
Next, as shown in FIG. 1 (c), the ship side outer plate 7 as an SL block is placed on the ground with the outer surface of the hull facing down, and the block is placed at a required position on the ship side outer plate 7 as the SL block. 8 is placed upside down, and the end of the reinforcing member 10 is welded to the inner surface of the ship side outer plate 7 to be integrated with the GSL block 12.
And so on. Next, the coating film on the block 8 side generated during the welding is repaired and cleaned of burnout and dirt, and the coating on the ship side outer plate 7 side as the SL block is performed using a low-cleaning type tar epoxy paint.

When the above-mentioned painting is performed on the ground, each block is carried into the dock and the divided blocks 2a and 2b of the bottom 2 are joined together. The GS assembled as shown in Fig. 1 (c)
The L block 12 is placed upright, and the joint between the block 12 and the bottom 2 is joined to construct a double bottom ballast tank 1 as shown in FIG. Next, unpainted portions in the ballast tank 1 are subjected to collective painting in the ship using a low-cleaning type tar epoxy paint.

In the coating method of the present invention, when the coating is carried out using a low-cleaning type tar epoxy paint, a simple undercoating treatment that does not remove rust is performed prior to the coating. Prior to spray coating, a stripe coat by brushing is applied to all welded portions and narrow portions such as corners and corners in order to eliminate the possibility that the paint does not penetrate well into narrow portions due to processing.

According to the coating method of the present invention in which the ballast tank 1 is coated with a low-cleaning type tar epoxy paint, a high-grade base treatment is not required, and even a ship with poor workability can be easily cleaned and cleaned. The coating process can be performed at a stretch by performing processing.On the other hand, the ground coating, which performs coating on a block-by-block basis, can be limited to high places where scaffolding is required in shipboard coating. The painting operation can be performed only in the minimum number of places, and can be about 20% of the entire painting range. Other parts are subjected to collective coating after completion of fire work on the ship, so that the coating on the ship can be reduced to 80%.

Therefore, in order to paint a large area at a stretch with in-vehicle coating, which has poor workability, it is necessary to repair the burned-out portion of the coating and clean the dirt, etc., as in the conventional 90% ground coating and 10% in-vehicle coating. Hanging work can be eliminated, so that labor and work time can be reduced, and the cost required for painting the ballast tank 1 can be reduced.

FIG. 2 shows a case I of the coating method of the present invention in which 20% of the entire coating area of the ballast tank 1 is ground block coated (20% ground conversion ratio) using a low-cleaning type tar epoxy paint. When using 90% of the total coating area as the ground coating (90% ground conversion rate) using the cleaning type tar epoxy paint II
And 90% of the total painted area is ground-based (90% ground-based)
In the case of the conventional coating method using a tar epoxy paint, the process difference in III is shown.
In the case of the coating method I of the present invention, the total man-hour required for the entire coating in the ballast tank 1 is 1834H, whereas the total man-hour required for painting the same area by the conventional coating method III is half that of the total man-hour 3912H. Therefore, the number of steps can be significantly reduced as compared with the conventional coating method.

Also, even when a low-cleaning type tar epoxy paint is used, if the grounding rate is 90% as in II, the total man-hour is 2301H and the grounding rate of the present invention is 20%.
%, The number of steps can be reduced.

[0023]

As described above, according to the method for painting a ballast tank of a ship according to the present invention, the painting of the ballast tank at the double bottom portion is performed at a high position where a scaffold is required after the ballast tank is constructed. When assembling parts in blocks on the ground before building the ballast tank in advance, apply a low-cleaning type tar epoxy paint to make the ground coating about 20%, and paint other places with fire after building the ballast tank After completion of construction, etc., low-clean tar-epoxy paint is applied on the ship at once to achieve 80% paint on the ship. Because it is possible to paint simply by performing basic ground treatment, it is possible to limit the part to be ground-painted to only the minimum number of places, and to paint other painting places at once on the ship It is possible to eliminate the possibility of burning and dirt on the paint film coated on the ground when joining each block when building a ballast tank, and to perform postponed work such as repair of burnt parts of the paint film and cleaning of dirt Can be eliminated,
In addition, a surface equivalent to about 80% of the total painting area of the ballast tank can be collectively painted on the ship, thereby improving work efficiency, and is required for painting the ballast tank as compared with the conventional painting method. An excellent effect is achieved in that labor and work time can be greatly reduced and costs can be reduced.

Further, by performing a stripe coating of a brush coating prior to spray coating on a narrow portion such as a whole welded portion and a corner and a corner portion, low-cleaning can be performed on the narrow portion only with a simple base treatment. There is also an effect that the possibility that the type tar epoxy paint does not penetrate well can be eliminated.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a method for painting a ballast tank of a ship according to the present invention, wherein (a) is a cut-away front view of a ballast tank, and (b) is a part of a side block constituting the ballast tank. FIG. 3C is a diagram illustrating a posture when painting is performed, and FIG. 3C is a diagram illustrating a posture when performing painting on a GSL block including a side block and a ship side outer plate in FIG.

FIG. 2 shows a comparison of man-hours when a ballast tank coating method for a ship according to the present invention is applied to a ground coating method using a low-cleaning type tar epoxy paint in the same manner as the conventional coating method and the coating method according to the present invention. FIG.

FIG. 3 schematically shows a conventional ballast tank coating method, in which (a) is a partially cutaway perspective view showing an example of a double-bottom ballast tank, and (b) is a side block and a ship side outer plate. FIG. 3C is a view showing a state in which the bottom of the ship is divided into blocks.

[Explanation of symbols]

 Reference Signs List 1 ballast tank 2 ship bottom 2a ship bottom block (block) 7 ship side outer plate (SL block) 8 side block (LT block) 12 GSL block (block)

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroyuki Yajima 2-1-1 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries, Ltd.

Claims (2)

[Claims] After building a ballast tank having a double bottom portion, each portion of the ballast tank is blocked on the ground only at a high position where scaffolding is required when painting the inside of the ballast tank. When assembling, apply ground coating using low-cleaning tar epoxy paint,
Then, after assembling the blocks assembled on the ground to build the above ballast tank, performing fire work on the ship, etc., and then applying the low-cleaning type tar epoxy paint to places other than the places where the ground coating was performed A method for painting a ballast tank of a ship, comprising performing in-vessel painting in which the whole vessel is painted on and then painting in a ballast tank. 2. The method for painting a ballast tank of a ship according to claim 1, wherein a stripe coating of a brush coating prior to the spray coating is performed on all welded parts and narrow parts such as corners and corners.