JPS64277B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-temperature tank mounted on a ship, and particularly to a covering structure for the upper part of the tank.

Generally speaking, for low-temperature tanks made of aluminum alloy, etc., it is necessary to cover the upper part of the tank that protrudes upward from the hull to protect against fire. Glass is used as the main material, and glass wool is packed between the foam glasses as a cushioning material, and a special coating layer is applied to the outermost layer.

A steel cover is installed on the ship to cover the upper part of the tank at a location away from the above-mentioned coating layer on the upper part of the tank, thereby preventing radiant heat from the fire source.

However, in the tank upper coating structure of conventional low-temperature tank ships, the main material of the coating layer, foam glass, is brittle and vulnerable to impact and friction, so it is necessary to apply a special coating layer to its surface. However, forming the curved surface of the foam glass layer requires a lot of man-hours, and
There is a problem in that a considerable amount of material loss occurs.

Another problem is that since the steel cover is provided at a position separated from the outer surface of the upper part of the tank, a separate support structure is required for the steel cover.

The present invention aims to solve these problems by using polyurethane foam, which has sufficient toughness and is easy to install, as the main insulation material, and by incorporating a steel cover into a simple structure. An object of the present invention is to provide a tank upper covering structure for a low-temperature tank ship, which can efficiently protect the tank upper part with a simple configuration.

For this reason, the present invention provides a cryogenic tank mounted on a ship's hull with a steel cover that is integrally incorporated on the outside of the tank's upper part to cover the tank's upper part that protrudes upward from the hull of the ship. A first glass wool layer along the inner surface of the glass wool layer and an aluminum foil layer along the inside of the glass wool layer are provided, and a second glass wool layer is provided along the outer surface of the upper part of the tank. polyurethane foam is filled between the layer and the second glass wool layer, and
A fireproof coating layer is provided on the outer surface of the steel cover, and the upper and lower edges of the steel cover are fixed to a pair of wooden joists vertically spaced apart from each other on the outer periphery of the upper part of the tank. It is characterized by being

Hereinafter, a tank upper covering structure of a cryogenic tank ship as an embodiment of the present invention will be explained with reference to the drawings.
Fig. 2 is a side view showing a part of it in section, Fig. 3 is an enlarged sectional view of the part shown in Fig. 2, Fig. 4 is an enlarged sectional view showing the part shown in Fig. 2, and Fig. 5 is an enlarged sectional view showing the part shown in Fig. 2. The figure is the first
FIG. 3 is a cross-sectional view showing an enlarged portion of the figure.

As shown in these figures, the cryogenic tank 1 installed inside the hull is arranged so that the upper part 1a of the tank protrudes above the upper deck 2 of the hull, and a steel tank covering the upper part 1a of the tank is installed. cover 3
is integrally integrated with a wooden joist 4a adhered to the outer periphery of the upper part of the tank on the upper deck 2 of the hull, and a wooden joist 4b adhered to the top of the tank using adhesive and wood screws 3a.

Then, the first
A glass wool layer 5 is provided, and a second glass wool layer 6 is provided along the outer surface of the tank upper portion 1a.

Further, an aluminum foil layer 7 is provided inside the first glass wool layer 5, and a polyurethane foam 8 is provided in the space between the aluminum foil layer 7 and the second glass wool layer 6 formed in this way.
are filled by foaming in place or by installing slabs.

Further, on the outer surface of the steel cover 3, there is provided a fireproof and waterproof coating layer 9 consisting of a metal lath 9a and an epoxy resin 9b sprayed onto the metal lath 9a.

In addition, the code|symbol 10 in a figure is a spacer, 11 is a silicone sealing, 12 is a urethane filler, and 13
indicates a small cover.

With the above-described structure, the polyurethane foam 8 as the main heat insulating material is only filled in the space between the aluminum foil layer 7 inside the first glass wool layer 5 and the second glass wool layer 6, and the tank 1 Even if the tank 1 cools and contracts, it will not be directly affected by the displacement of the tank 1. That is, since the displacement of the tank 1 is absorbed by the first and second glass wool layers 5 and 6 disposed on both sides of the polyurethane foam 8, the polyurethane foam 8 is completely free from thermal stress during tank cooling. In addition to being in a free state and eliminating the fear of destruction, the steel cover 3 and the coating layer 9 along its outer surface provide insulation against radiant heat from the fire source, and also prevent flames from entering the internal insulation material. can do.

And the aluminum foil layer 7 is made of steel cover 3.
It can block the radiant heat from the

Furthermore, the presence of the steel cover 3 has the advantage that the polyurethane foam 8 can be easily foamed in-situ.

A coating layer 9, a steel cover 3 and an aluminum foil layer 7 are used to prevent moisture from entering from the outside.
can sufficiently counter and prevent this.

Since the coating layer 9 also functions to protect the steel cover 3 from corrosion, ordinary steel can be used for the cover 3, and together with the installation of the steel cover 3 into the tank upper part 1a, the It can bring about cost reduction.

As described in detail above, according to the tank top covering structure for a low-temperature tank ship of the present invention, the polyurethane foam as the main insulation material is formed by a pair of wooden joists disposed vertically apart from each other on the outer periphery of the tank top. The polyurethane layer is filled in the space between the aluminum foil layer inside the first glass wool layer to be formed and the second glass wool layer, and since the polyurethane layer is not bonded to the tank, the tank is cooled. Even if the tank contracts, it will not be directly affected by the displacement of the tank. That is, since the displacement of the tank is absorbed by the first and second glass wool layers disposed on both sides of the polyurethane foam,
The above-mentioned polyurethane layer becomes completely stress-free against thermal stress during tank cooling, eliminating the risk of breakage and providing long-lasting fire and water resistant performance. Since it is directly supported on the top, it has the advantage of not requiring a separate support structure, which is advantageous in terms of strength, improves workability, and can be constructed at low cost because common materials are used. There are advantages that can be achieved.

[Brief explanation of drawings]

The figures show a tank upper covering structure of a cryogenic tank ship as an embodiment of the present invention, in which Fig. 1 is a partially cutaway plan view, and Fig. 2 is a partially cutaway side view. Fig. 3 is an enlarged sectional view of the part shown in Fig. 2, Fig. 4 is an enlarged sectional view of the part shown in Fig. 2, and Fig. 5 is an enlarged sectional view of the part shown in Fig. 1. FIG. 1...Low temperature tank, 1a...tank upper part, 2...
...Hull upper deck, 3... Steel cover, 3a... Wood screws, 4a, 4b... Wooden joists, 5... First glass wool layer, 6... Second glass wool layer, 7...
...Aluminum foil layer, 8...Polyurethane foam, 9...Fireproofing and waterproofing coating layer, 9a...
Metal lath, 9b...Epoxy resin, 10...Spacer, 11...Silicon sealing, 12...
Urethane filler, 13...Small cover.

Claims (1)

[Claims] 1. In a cryogenic tank mounted on a ship's hull, a steel cover is provided integrally on the outside of the upper part of the tank to cover the upper part of the tank that protrudes upward from the hull of the cryogenic tank, and a steel cover is provided on the inner surface of this steel cover. A first glass wool layer along the inner surface of the glass wool layer and an aluminum foil layer along the inside of the glass wool layer are provided, and a second glass wool layer is provided along the outer surface of the upper part of the tank, and the aluminum foil layer and the second glass wool layer are provided along the outer surface of the upper part of the tank. A polyurethane foam is filled between the steel cover and the glass wool layer, and a fireproof and waterproof coating layer is provided on the outer surface of the steel cover, and the upper and lower edges of the steel cover are connected to the outer periphery of the upper part of the tank. A tank upper covering structure for a cryogenic tank ship, characterized by being fixed to a pair of wooden joists vertically spaced apart from each other.