JPH06211290A - Floating-roof heat-insulation method of floating roof-type tank - Google Patents

Abstract

PURPOSE:To prevent a heat insulating material from separating from a deck plate while adhesive hardens, even if the deck plate is deformed in the manner of undulating by wind pressure, etc., in the heat-insulating application for bonding, by adhesive, the heat insulating material to the deck plate constituting the floating roof of a floating roof-type tank. CONSTITUTION:When a waterproof and heat insulating material composed of a heat insulating material 4 having fire resistance and flexibility and waterproof sheet member 6 is bonded to a deck plate 1 constituting the floating roof of a tank by the use of adhesive 5 having flexibility also after hardening, a weight 8 made by filling e.g. a bag composed of flexible synthetic resin with water is placed on the waterproof and heat insulating material 4 and the adhesive 5 is hardened. Thus, even if an undulating deformation occurs in the deck plate 1 by wind pressure, etc., during application; the weight 8 is deformed in the manner of following the deformation of the deck plate 1 and a load by the weight changes from a concentrated state to a dispersed state, i.e., a concentrated load is expanded to become a dispersed load so that the separation phenomenon of the waterproof and heat insulating material is prevented beforehand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating roof heat insulating construction method for a floating roof tank used for storing heavy oil, crude oil and the like.

[0002]

2. Description of the Related Art Generally, in a storage tank for heavy oil, crude oil or the like having a high viscosity at room temperature, the oil storage temperature is maintained at 50 to 60 ° C. in order to ensure the fluidity of the oil storage. Therefore, it is necessary to install a heat insulating material on the tank from the viewpoint of energy saving. However, many tanks for storage of heavy oil, crude oil, etc. are of floating roof type, and most of them are of single deck type.

FIG. 2 schematically shows the structure of a storage tank having a single-deck floating roof. In the figure, T is a tank, B is a circular floating roof, 1 is a steel deck plate constituting the floating roof, 2 is a pontoon, and 3 is a sealing member. Since the deck plate of the single-deck floating roof is made of steel plate with a thickness of about 4.5 mm, it easily undulates and deforms due to wind pressure and walking of inspection workers. It is difficult to apply the heat insulating material, and many of the existing single deck tank deck plates do not have the heat insulating material.

The following conditions are required for a heat insulating structure for a deck plate of a single deck tank. Since the temperature inside the tank is 50 to 60 ° C., the heat insulating material does not deform at this temperature, and peeling or cracking does not occur. Excellent weather resistance. Since it is often exposed to rainwater, it has a structure that does not absorb water. It has the flexibility to always follow the deformation of the deck material. Does not promote corrosion of deck materials. Pass the fire resistance standards of the Fire Service Act.

[0005]

Conventionally, a construction method shown in FIG. 3 is known as a heat insulation method for an existing single-deck type floating roof. In the figure, reference numeral 1 denotes a deck plate, on which a heat insulating material 4 having fire resistance and flexibility is provided, and an adhesive 5 having flexibility even after curing.
When the waterproof sheet member 6 is provided on the surface of the heat insulating material 4 to form a heat insulating structure, the deck plate 1 is deformed by wind pressure or the like until the adhesive hardens, and the waterproof heat insulating material 4 becomes the deck plate 1. Since there is a high possibility of peeling from the surface, it is necessary to place the weight 7 on the waterproof heat insulating material until the adhesive hardens.

However, when a rigid material such as a concrete block is used as the weight, the weight cannot follow the undulating deformation of the deck plate when the deck plate is deformed by wind pressure or the like, so that as shown in FIG. 3B. In addition, the waterproof insulation may peel off the deck plate. In order to prevent this, it is sufficient to prepare a weight with sufficient weight so that the deck plate will not be deformed by wind pressure etc. However, the thickness of the deck plate is thin at about 4.5 mm, and the waterproof insulation material is used. Considering the mechanical strength of, it is not preferable to use a heavy weight.

[0007]

It is an object of the present invention to sufficiently maintain the mechanical safety of a waterproof heat insulating material in the heat insulating construction of a deck plate of an existing single-deck type tank, and at the same time, while the adhesive hardens, The main object of the present invention is to provide a heat insulating construction method for a deck plate of a floating roof type tank, which allows the heat insulating material to follow the deformation reliably.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a deck plate of a floating roof tank is provided with a waterproof heat insulating material composed of a fireproof and flexible heat insulating material and a waterproof sheet member, and is flexible even after curing. When adhering with an adhesive, the gist is to put a weight that can be deformed following the deformation of the deck plate due to wind pressure on the waterproof heat insulating material and cure the adhesive. .

The heat insulating material used in the present invention comprises, for example, a fire resistant powder made of a fire resistant powder such as aluminum hydroxide or calcium carbonate as a main component, and an organic binder and a foaming agent added thereto for foaming. A molded heat insulating material which has flexibility and whose cells mainly consist of closed cells and does not absorb water can be mentioned.

Further, the adhesive used in the present invention is required to have a high adhesive strength, a heat resistant temperature of 60 ° C. or higher, and be flexible even after curing. An example is a modified silicone adhesive.

[0011]

According to the above heat insulation construction method, when the deck plate is wavy and deformed due to wind pressure during the curing of the adhesive, the weight on the waterproof heat insulating material is deformed following the deformation of the deck plate, and Since the concentrated load due to is spread as a dispersed load, the peeling phenomenon of the waterproof heat insulating material is prevented in advance.

[0012]

EXAMPLE FIG. 1 shows an example in which the present invention is applied to an existing single deck floating roof. In the figure, 1 is a deck plate, 4 is a heat insulating material, 5 is an adhesive, and 6 is a waterproof sheet member.

In this embodiment, the heat insulating material 4 is made of aluminum hydroxide as a main component, and is added with an organic binder and a foaming agent to be foamed. A width of 1260 mm and a thickness of 25 mm) was used, and a modified silicone adhesive was used as the adhesive. First, the surface of the deck plate 1 is surface-treated with an anticorrosive paint, and then the adhesive is applied, and the waterproof heat insulating material 4 to which the waterproof sheet member 6 is bonded is adhered to the flexible polyethylene bag. A weight 8 made of water was placed on the body to cure the adhesive.

Deformation of the deck plate was observed due to wind pressure and walking of the inspector during the curing of the adhesive, but as shown in FIG. 1 (B), the followability of the weight 8 to the deformation of the deck plate was observed. Since it was good, the waterproof heat insulating material did not peel off from the deck plate during the curing of the adhesive. Further, even if the weight is removed after the adhesive is cured, the adhesive remains flexible even after curing, and the waterproof heat insulating material also has flexibility.
It was able to follow the deformation of the deck plate, and the waterproof insulation did not peel off.

[0015]

As described above, according to the present invention,
When a waterproof insulating material composed of a fireproof and flexible insulating material and a waterproof sheet member is adhered to a deck plate of a floating roof tank by using an adhesive having flexibility even after curing, the waterproof insulating material is used. Since the method is to cure the adhesive by placing a weight on the material that can be deformed following the deformation of the deck plate due to wind pressure, etc., the waterproof heat insulating material is removed from the deck plate during the curing of the adhesive. It does not peel off, and even if the weight is removed after the adhesive is hardened, the adhesive remains flexible even after hardening and the waterproof heat insulating material also has flexibility, so it does not cause wavy deformation of the deck material. It can be followed and the waterproof insulation will not come off. Further, according to the construction method of the present invention, when a weight in which a flexible bag body is filled with water is used, the water in the bag body may be discarded after the construction is completed, and the collection is easy.

[Brief description of drawings]

1A and 1B show an embodiment of the present invention, in which FIG. 1A is a heat insulating structure diagram in which a deformable weight is placed on a heat insulating material applied to a deck plate, and FIG. 1B is a corrugated deck plate. It is a heat insulation structure figure of the state at the time of deformation.

FIG. 2 is a schematic configuration diagram of a tank having a single deck floating roof.

FIG. 3 shows a conventional example, (A) is a heat insulating structure diagram in which a rigid weight is placed on a heat insulating material applied to a deck plate, and (B) is a state when the deck plate is wavy and deformed. It is a heat insulation structure figure of.

[Explanation of symbols]

 T tank 1 deck plate 2 pontoon 3 seal member 4 heat insulating material 5 adhesive 6 waterproof sheet member 7 rigid weight 8 deformable weight

Claims (1)

[Claims] 1. A deck plate constituting a floating roof of a floating roof tank is provided with a waterproof heat insulating material composed of a fireproof and flexible heat insulating material and a waterproof sheet member, and an adhesive having flexibility even after curing. A floating roof type characterized by placing a weight that can be deformed following the deformation of the deck plate due to wind pressure or the like on the waterproof heat insulating material when the adhesive is cured by using the adhesive. Insulation method for floating roof of tank.