JP2006125609A - Heat insulation cold reserving panel of dike of cryogenic liquid storage tank, and heat insulation cold reserving structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the heat insulation property, the strength, and the durability in a heat insulation cold reserving panel of a dike of a cryogenic liquid storage tank. <P>SOLUTION: A heat insulation cold reserving panel laid on the bottom surface or the side surfaces inside the dike surrounding the cryogenic liquid storage tank suppresses the evaporation and the boiling of the cryogenic liquid leaked out from a storage tank within the dike. The heat insulation cold reserving panel 1 is a heat insulation plate 2 made of light weighted cellular concrete. A water proof coating film 3 is stuck on all or some surfaces of the heat insulation plate 2. The heat insulation cold reserving panels 1 are fixed to the bottom surface or the side surfaces in the dike, and the surfaces of the heat insulation plate 2 made of light weighted cellular concrete coated with the water proof coating film 3 are exposed outdoors. Rain and snow fall upon the exposed surfaces, and the cryogenic liquid leaked out from the storage tank into the dike comes into contact with the exposed surfaces. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat insulation cold insulation panel and a heat insulation cold insulation structure used for a liquid barrier in a cryogenic liquid storage tank.

  Low temperature liquid storage tanks such as LNG tanks and LPG tanks on the ground are provided with a breakwater surrounding them. When the cryogenic liquid that is being stored leaks due to an accident, the cryogenic liquid is kept in the dike to prevent it from flowing out. When the low temperature liquid flows into the breakwater, it receives heat from the outside air and the ground, evaporates, and boils. In order to suppress the evaporation and boiling, the breakwater is provided with a heat insulating cold insulation layer on the bottom and side surfaces of the inner surface to reduce the amount of heat inflow.

  In the floor structure in a breakwater disclosed in Patent Document 1, a heat insulating layer of a foam glass panel is formed on a concrete layer on the ground, and a waterproof sealing layer of latex mortar is formed on the heat insulating layer. Furthermore, a waterproof layer of acrylic resin or hyperon rubber is formed on the waterproof sealing layer.

  The liquid breakwater disclosed in Patent Document 2 has a heat insulating layer of an inorganic heat insulating material such as foam glass, foamed concrete or vermiculite concrete formed on the inner surface of the concrete wall, and a protective coating of latex mortar formed on the heat insulating layer. . Further, a waterproof film such as an acrylic resin or a hypalon rubber is formed on the protective film.

  In the heat insulation structure of a breakwater disclosed in Patent Document 3, a panel material is pasted on the concrete foundation and the inner surface of the wall. The panel material has bonded the nonflammable flexible board (asbestos cement board) on the urethane foam board which mixed glass fiber.

  In the breakwater disclosed in Patent Document 4, concrete segments are laid and arranged on a sand layer on the ground, a formwork is assembled on the concrete segment, and heat insulating concrete mixed with reinforcing fibers is placed in the formwork.

Japanese Utility Model Publication No.57-57280 Japanese Utility Model Publication No. 57-122899 JP 2002-115799 A JP 2003-240199 A

  When foam glass is used for the heat insulating material of the breakwater, the glass wall between the bubbles is thin and easy to break. Low strength. When lightweight cement is used for the heat insulating material, the light weight cement board has an upper limit in the blending ratio of the lightweight aggregate, and high heat insulating properties cannot be obtained. When glass fiber reinforced urethane foam is used, the urethane foam is flammable and has low safety. Low weather resistance.

  In addition, when a protective layer of latex mortar or asbestos cement board is provided on the heat insulating material, the protective layer of latex mortar or asbestos cement board becomes reinforced and waterproof, but has a certain thickness and volume, Large heat capacity and large amount of heat storage. Accordingly, when the low temperature liquid leaking from the storage tank comes into contact with the protective layer, the amount of heat transferred from the normal temperature protective layer to the cryogenic leaked liquid is large. Even if the heat transfer rate of the heat insulating material is low, the initial evaporation rate of the low-temperature liquid is increased by the heat stored in the protective layer. Cooling properties deteriorate.

  In addition, the construction method in which the insulation and cold insulation layer of the breakwater is fired on-site is different from the prefabricated construction method in which panels manufactured at the factory are pasted on site, and it is difficult to make the quality such as thermal conductivity and strength uniform over a wide construction range. In addition, in terms of safety and construction period, it is not suitable for the renovation work of the heat insulation and cold insulation layer that is performed during the storage of the cryogenic liquid.

[Idea for solving problems]
1) We decided to use the prefabricated construction method for the insulation and cold insulation layer of the breakwater, which is superior in quality uniformity, safety and construction period than the on-site construction method. We decided to provide a heat insulation and cold insulation panel suitable for the prefabrication method.

  2) The insulation cold insulation panel of a breakwater needs heat insulation. In addition, it does not receive external force as much as the heat insulation block laid under the cryogenic liquid storage tank, but it must be strong enough to withstand transportation, construction, and walking by maintenance personnel. Therefore, we decided to adopt lightweight aerated concrete with many bubbles in the heat insulating material. Lightweight cellular concrete can adjust thermal properties by controlling the amount of foam and the form of the foam. In addition, the strength can be ensured by optimizing the blending ratio of raw materials and curing conditions. Strength and durability can be increased from foam glass and urethane foam, and heat insulation can be increased from lightweight cement boards. Therefore, it can be set as the performance calculated | required by the heat insulation cold insulation layer of a breakwater.

  3) Unlike the heat insulation block under the low temperature liquid storage tank, the heat insulation and cold insulation panel of the breakwater is exposed to the outdoors, and rain and snow fall on it. The lightweight cellular concrete thermal insulation material is infiltrated with rainwater, and its thermal properties deteriorate when absorbed. Moreover, if water absorption repeats freezing and thawing, durability will deteriorate. Therefore, we decided to waterproof the lightweight cellular concrete as a heat insulating material.

  4) In the heat insulation and cold insulation panel of the breakwater, the outdoor exposed surface on which rain or snow falls is also the surface where the low temperature liquid leaking from the storage tank comes into contact. When mortar or cement is used for the waterproof material on the outdoor exposed surface of the heat insulating material, as described above, the waterproof layer becomes thick and the heat capacity or heat storage amount increases. Coolability deteriorates. Therefore, a paint is used for the waterproof material. Generally speaking, waterproof coatings are orders of magnitude thinner than mortar and cement layers, and have very little heat capacity or heat storage. The initial evaporation rate of the low-temperature liquid is not increased, and the cold insulation property is hardly deteriorated. Further, the waterproof coating film hardly deteriorates the heat passage rate of the heat insulating and cold insulating panel. When the thickness of the waterproof coating is limited to a certain range, desired waterproof properties and low heat capacity can be obtained.

1) In a panel that suppresses evaporation and boiling of low temperature liquid that leaks from the storage tank into the breakwater by being attached to the bottom or side of the breakwater surrounding the cryogenic liquid storage tank.
This heat insulation cold insulation panel is a lightweight cellular concrete heat insulation board, and a waterproof coating is adhered to all or a part of the heat insulation board.

2) In the above heat insulation and cold insulation panel,
The thickness of the waterproof coating is 50 μm or more, and is not more than 1 / 40th of the thickness of the lightweight cellular concrete heat insulating plate.

3) In the above heat insulation and cold insulation panel,
The paint for the waterproof coating is one or two of a urethane resin paint and a fluororesin paint.

4) In the above heat insulation and cold insulation panel,
Lightweight cellular concrete insulation board is composed of silicic acid powder and calcareous powder as main raw materials, mixed with water and foaming agent to make raw material slurry, foamed and cured raw material slurry, autoclaved calcium silicate hydrate It has 50 vol% or more of bubbles having a diameter of 0.2 mm or more.

5) In the above heat insulation and cold insulation panel,
The lightweight cellular concrete heat insulating plate has a bulk specific gravity of 0.35 to 0.42 in an absolutely dry state and a thermal conductivity of 0.07 to 0.12 W / mK.

6) In the heat insulation and cold insulation structure of the breakwater in the cryogenic liquid storage tank,
The above-mentioned heat insulation cold insulation panel is fixed to the bottom or side of the breakwater surrounding the cryogenic liquid storage tank, and the surface with the waterproof coating of the lightweight cellular concrete insulation plate is exposed to the outdoors. Rain and snow are falling, and low temperature liquid leaking from the storage tank into the breakwater is in contact.

  Thermal insulation panels of the breakwater are controlled by adjusting the thermal characteristics by controlling the foaming amount and foam form of the lightweight cellular concrete insulation plate of the component, and the necessary strength by adjusting the blending ratio and curing conditions of the raw materials It is possible to ensure the performance required for the heat insulation and cold insulation layer of the breakwater. Strength and durability can be increased from foam glass and urethane foam, and heat insulation can be increased from lightweight cement boards.

  The lightweight cellular concrete insulation board has a waterproof coating surface exposed to the outdoors, and rain and snow fall on the surface, and low temperature liquid leaking from the storage tank into the breakwater is in contact. Water penetration from the surface is stopped by the waterproof coating, and deterioration of thermal characteristics and durability is prevented. In addition, the waterproof coating is thinner than the mortar layer and the cement layer, and hardly deteriorates the thermal characteristics of the heat insulation and cold insulation panel.

  Insulated cold insulation panels are used in the prefabricated method, which is manufactured at the factory and transported to the site of the breakwater. In construction, quality such as thermal conductivity and strength can be made uniform over a wide range of construction, ensuring safety and shortening the construction period.

  As shown in FIG. 1, the heat insulation and cold insulation panel 1 has a rectangular flat plate shape, and is composed of a lightweight cellular concrete heat insulating plate 2 and a waterproof coating 3 attached to all and six surfaces of the heat insulating plate 2. ing. In addition, the lightweight cellular concrete heat insulation board 2 has embedded the reinforcement of the lath net. Bending strength is reinforced. The rectangular plate-like heat insulation and cold insulation panel 1 penetrates through bolt holes 4 for fixing the panel at a plurality of locations.

  The lightweight cellular concrete heat insulating plate 2 is a lightweight cellular concrete plate in which many fine closed cells are inherent. This manufacturing method is as follows.

  The main raw materials are siliceous powders such as silica and quartz, and calcareous powders such as quicklime, slaked lime and Portland cement. Other raw materials are a metal powder foaming agent such as aluminum and a viscosity modifier such as gypsum and methylcellulose. These raw materials are mixed with water to form raw slurry. The raw material slurry is put into a mold, foamed by generation of hydrogen gas, and cured. In a semi-cured state, it is cut to a desired size, or without being cut, it is autoclaved and hydrothermally reacted to produce calcium silicate hydrate.

  The lightweight cellular concrete board is selected in terms of strength and thermal characteristics by adjusting the blending ratio of raw materials, curing conditions, the amount of foaming and the form of cells.

  The light-weight cellular concrete heat insulating plate 2 contains 50 vol% or more of air bubbles having a diameter of 0.2 mm or more. The range of 55-75 vol% is preferable. With such an amount of foaming, the bulk specific gravity in the absolutely dry state is adjusted within the range of 0.35 to 0.42. When the bubbles are smaller than 0.2 mm in diameter, the walls between the bubbles are thin, and it is difficult to ensure the strength.

The mixing ratio of the siliceous powder and the calcareous powder as the main raw material is optimally 0.7 to 0.4 in terms of a CaO / SiO ₂ molar ratio. The autoclave curing conditions are preferably a temperature of 175 to 190 ° C., a pressure of 8 to 15 atmospheres, and a time of 4 hours or more. With such a blending ratio and curing conditions, the compressive strength is 1.5 to 3 N / mm ² . The thermal conductivity is 0.07 to 0.12 W / mK when the moisture content is about 0.9 vol% and the temperature is about 20 ° C. The more closed cells, the lower the thermal conductivity.

  The lightweight cellular concrete heat insulating plate 2 has a thickness of 30 to 100 mm, and has a planar dimension of, for example, a rectangular shape of about 600 × 1800 mm or a square shape of about 600 × 600 mm. A size that can be handled manually is preferable.

  The waterproof coating 3 is slightly different in configuration between the surface exposed outdoors, the back surface not exposed outdoors, and the four surrounding sides.

The surface of the lightweight cellular concrete heat insulating plate 2 and the waterproof coating 3 on the outdoor exposed surface are composed of undercoat, undercoat, and overcoat for base adjustment. The surface of the lightweight cellular concrete heat insulating plate 2 has a filler attached as an undercoat for undercoat adjustment, a water-based urethane resin paint as an intermediate coat thereon, and a water-based fluororesin paint as an overcoat thereon. A filler is a sealing agent, and the adhesion amount is 500-800 g / m < ² >. The water-based urethane resin paint is excellent in durability for a long period of time, and its adhesion amount is 200 to 300 g / m ² . The water-based fluororesin paint has a slight elasticity and is excellent in weather resistance, and its adhesion amount is 100 to 200 g / m ² .

The waterproof coating 3 on the side surface of the lightweight cellular concrete heat insulating plate 2 is composed of a base adjustment undercoat, intermediate coat and top coat. On the side surface of the lightweight cellular concrete heat insulating plate 2, a filler is attached as an undercoat for undercoating, a water-based urethane resin paint is attached as an intermediate coating thereon, and a water-based urethane resin paint is attached as an overcoat thereon. The filler of the undercoat is the same sealant as that adhered to the surface of the heat insulating plate 2, and the adhesion amount is 500 to 800 g / m ² . The intermediate-coated water-based urethane resin paint is the same paint as that attached to the surface of the heat insulating plate 2 and is excellent in durability for a long period of time. The adhesion amount is 200 to 300 g / m ² . The water-based urethane resin paint of the top coat is the same paint as that of the intermediate coat, has excellent long-term durability, and the adhesion amount is 100 to 200 g / m ² .

The waterproof coating 3 on the back surface of the lightweight cellular concrete heat insulating plate 2 and the outdoor non-exposed surface is composed of a base adjustment undercoat and topcoat. On the back surface of the lightweight cellular concrete heat insulating plate 2, a sealer is attached as an undercoat for undercoat adjustment, and a water-based urethane resin paint is attached as an overcoat thereon. The undercoat sealer is a sealing agent, and its adhesion amount is 100 to 200 g / m ² . The top-coated water-based urethane resin paint is the same paint as that adhered to the surface and side surfaces of the heat insulating plate 2 and has excellent long-term durability, and the amount of adhesion is 200 to 300 g / m ² .

  The thickness of the waterproof coating 3 is 400 to 700 μm. Considering the surface roughness of the lightweight cellular concrete heat insulating plate 2, the thickness of the waterproof coating 3 is preferably 50 μm or more. If it is thinner than 50 μm, it is difficult to ensure waterproofness. In consideration of the thermal conductivity of the heat insulating and cold insulating panel 1, the thickness of the waterproof coating 3 is preferably 1/40 or less of the thickness of the lightweight cellular concrete heat insulating plate 2. Based on the following theory.

  The thermal conductivity λ of the laminated state in which the waterproof coating film 3 is adhered to the surface of the lightweight cellular concrete heat insulating plate 2 is obtained. The lightweight cellular concrete heat insulating plate 2 has thermal conductivity and thickness of λ2 and δ2. The waterproof coating 3 has a thermal conductivity and thickness of λ3 and δ3. The thermal conductivity λ in the stacked state is expressed by the following equation.

    λ = λ2 · (δ3 / δ2 + 1) / {(λ2 / λ3) · (δ3 / δ2) +1}

The thickness δ2 of the lightweight cellular concrete insulating plate 2 is set to the minimum value in the above range, 30 mm. The thickness δ3 of the waterproof coating 3 is set to 700 μm, which is the maximum value in the above range. Δ3 / δ2 in the above formula is (700/30) × 10 ⁻³ = (7/3) × 10 ⁻² . It is negligible and negligible for 1.

The thermal conductivity λ3 of the waterproof coating 3 is 2 to 3 times the thermal conductivity λ2 of the lightweight cellular concrete heat insulating plate 2, for example, 0.084 Kcal / mh ° C. In the above formula, λ2 / λ3 is 1/2 to 1/3. (Λ2 / λ3) · (δ3 / δ2) in the above formula is (1/2 to 1/3) × (7/3) × 10 ⁻² = (7/6 to 7/9) × 10 ⁻² It becomes. It is negligible and negligible for 1.

  Therefore, the above equation is λ≈λ2. The thermal conductivity λ in the laminated state is substantially the same as the thermal conductivity λ2 of the lightweight cellular concrete heat insulating plate 2.

In the heat insulation and cold insulation panel 1, the waterproof coating 3 is orders of magnitude thinner than the lightweight cellular concrete insulation plate 2 and does not increase the thermal conductivity λ in the laminated state. (Thickness δ3 of waterproof coating 3 / thickness δ2 of lightweight cellular concrete insulation board 2) ≦ (7/3) × 10 ⁻² ≈1 / 40, the waterproof coating 3 has a heat conduction in a laminated state. The rate λ is not substantially increased.

  As shown in FIG. 2, the breakwater 11 surrounds the outer periphery of the cryogenic liquid storage tank 12 such as an LNG tank or an LPG tank. The inside of the breakwater 11 becomes a pond where the low temperature liquid leaking from the storage tank 12 is kept. The inner surface of the liquid breakwater 11 has a heat insulation and cold insulation structure in which the heat insulation and cold insulation panels 1 are attached to the bottom and surrounding side surfaces, respectively.

  As shown in FIG. 3, the heat insulation and cold insulation structure of the bottom surface of the liquid barrier 11 spreads and spreads the dry mortar 22 on the concrete base 21 on the ground, and the heat insulation and cold insulation panel 1 is laid and fixed thereon. . The heat insulating and cold insulating panel 1 has a back surface that is in contact with the dry mortar 22 and is an outdoor non-exposed surface, and a surface that is in contact with the outside air and is an outdoor exposed surface. Rain or snow falls on the exposed outdoor surface of the surface, and the low-temperature liquid leaked from the storage tank 12 into the breakwater 11 contacts.

  The concrete base 21 is casted with ready-mixed concrete or laid with precast concrete boards. The dry mortar 22 is a mixture of cement and sand. The heat insulation and cold insulation panel 1 is fixed to the concrete base 21 with anchor bolts 23 penetrating the bolt holes 4. It is prevention of floating.

  As shown in FIG. 4, the heat insulation and cold insulation structure on the side surface of the liquid barrier 11 includes an adhesive layer 32 formed on the side surface of the dam housing 31, and the heat insulation and cold insulation panel 1 is bonded and fixed to the adhesive layer 32. The heat insulation cold insulation panel 1 has the back surface adhered to the adhesive surface of the adhesive layer 32 and is an outdoor non-exposed surface, the surface is in contact with outside air, and is an outdoor exposed surface. Rain or snow falls on the exposed outdoor surface of the surface, and low-temperature liquid leaked from the storage tank 12 into the breakwater 11 contacts.

  The structure 31 of the bank is made of concrete and is established on the ground. The heat insulation and cold insulation panel 1 is fixed to the concrete frame 31 with anchor bolts 33 penetrating the bolt holes 4.

[Modification]
1) In the above embodiment, the heat insulation cold insulation panel 1 has the waterproof coating 3 attached to the back surface of the outdoor non-exposed surface. In the case of a mounting structure that does not absorb water from the outdoor non-exposed surface, the waterproof coating 3 is not attached to the back surface.
2) In the above embodiment, the heat insulating cold insulation panel 1 has the waterproof coating 3 attached to the surrounding four side surfaces, but does not absorb water from the side surface when attached to the bottom surface or the side surface in the liquid barrier 11. When waterproofing the joint structure, for example, the joint between the heat insulation and cold insulation panels 1, the waterproof coating 3 is not attached to the side surface.
3) In said embodiment, although the lightweight cellular concrete heat insulation board 2 of the heat insulation cold insulation panel 1 contains the reinforcing bar, it makes it non-rebar.

[Comparison test]
The following various tests were performed on the panels of the following examples and comparative examples.

<Compressive strength of panel>
The compressive strength of the panel was measured according to the compression test of JIS A5416 “Lightweight cellular concrete panel”. The panel was qualified with a compressive strength of 1.5 N / mm ² or more. However, those that buckled with a finger were disqualified.

<Initial evaporation of low temperature liquid>
As shown in FIG. 5, the measurement apparatus is configured such that a heat insulating container 41 is installed on a weight measuring device 42, a test body 43 is fitted to the bottom of the heat insulating container 41, and cryogenic liquid nitrogen 44 is charged into the heat insulating container 41. To do. The weight change with time after the charging is measured by the weight measuring device 42. The input amount of the liquid nitrogen 44 is 4 kg. The measurement time is 20 minutes. The test environment is an air temperature of 20 ° C. and a relative humidity of 60%. After 20 minutes of measurement time, the amount of liquid nitrogen 44 reduced and the amount of evaporation were determined. The panel qualified that the evaporation amount after 20 minutes passed was 700 g or less.

<Panel thermal conductivity>
The thermal conductivity of the panel was measured according to the thermal flow meter method of JIS A1412 “Measurement method of thermal resistance and thermal conductivity of thermal insulator”. The test body has dimensions of 200 × 200 × 20 mm. The measurement temperature is 20 ° C. Panels were qualified with a thermal conductivity of 0.12 W / mK or less.

<Repetition test of panel heating and cooling>
Using an environmental test apparatus, heating and cooling at a set temperature of 80 ° C. and −20 ° C. were repeated at a relative humidity of 98%. The holding time at the set temperature is 3 hours. The transition time between set temperatures is 2 hours. One cycle is 10 hours. After 50 cycles, the panel was observed on the surface with a magnifying glass and examined for abnormal appearance. Panels with no abnormalities were durable and qualified.

<Accelerated weathering test of panel>
The irradiation device is a dual cycle weather meter from which the filter of the sunshine carbon type weather meter is removed. The irradiation time is 300 hours. After the irradiation time, the panel was observed with a magnifying glass to examine the appearance abnormality. Panels with no abnormalities were weatherproof and qualified.

<Panel permeability test>
The water permeability of the panel was measured in accordance with JIS A6909 “Building finish coating material 7.13 Water permeability test B method”. A funnel is placed on the surface of the panel, the wide mouth at the lower end of the funnel is stopped with a silicone sealant, water is poured into the funnel at a height of 250 mm, and after 24 hours, the head height of the funnel is measured and reduced. The amount of water was determined. Panels with a water loss of 50 ml or less were waterproof and qualified.

[Example 1]
This heat insulation cool panel was manufactured as follows. The raw materials were 38 parts by weight of quartzite, 4.5 parts by weight of quicklime, 38.5 parts by weight of early strength Portland cement, 2.5 parts by weight of gypsum, and 16.5 parts by weight of ALC crushed material, with aluminum as a foaming agent in an external ratio 0.11 part by weight of powder, water and a viscosity modifier were mixed to form a slurry. The raw material slurry was put in a mold, foamed and cured. It was cured in an autoclave. The curing conditions were a temperature of 180 ° C., a pressure of 10 atm, and a time of 6 hours. A lightweight cellular concrete board having a bulk specific gravity of 0.37 was obtained. On the surface, an undercoat filler 500 g / m ² , an intermediate water-based urethane resin paint 250 g / m ² and a top-coat water-based fluororesin paint 150 g / m ² were adhered to form a waterproof coating film.
The insulated cold insulation panel of Example 1 was qualified for all the above tests.

[Example 2]
This heat insulation cold insulation panel reduced the foaming agent in the raw material in Example 1 to 0.09 weight part in manufacturing a lightweight cellular concrete board, and made others the same as in Example 1. The lightweight cellular concrete board had a bulk specific gravity of 0.41. In forming the waterproof coating on the surface, the same amount of water-based urethane resin paint was used instead of the top-coated water-based fluororesin paint in Example 1, and the others were the same as in Example 1.
The insulated cold insulation panel of Example 2 was qualified for all the above tests.

[Comparative Example 1]
For this panel, a lightweight cellular concrete board having a bulk specific gravity of 0.37 was produced in the same manner as in Example 1, and 10000 g / m ^{2 of} latex mortar was adhered to the surface.
The panel of Comparative Example 1 had a large initial evaporation amount and was not suitable. Other studies were eligible.

[Comparative Example 2]
This panel produced a lightweight cellular concrete board having a bulk specific gravity of 0.37 in the same manner as in Example 1. On the surface of the panel, an undercoat filler 500 g / m ² , a primer 200 g / m ² and an inorganic paint enamel A coating material of 50 g / m ² was adhered.
The panel of Comparative Example 2 was ineligible because fine cracks were generated in the hot and cold repeated test and the accelerated weather resistance test. Durability and weather resistance are inferior. Other studies were eligible.

[Comparative Example 3]
As in Example 1, this panel produced a lightweight cellular concrete board having a bulk specific gravity of 0.37, and on the surface thereof, an undercoat filler 50 g / m ² , an aqueous urethane resin paint 30 g / m ² and an aqueous system were produced. Fluorine resin paint 15 g / m ² was sequentially deposited.
The panel of Comparative Example 3 was not qualified in the water permeability test. The coating is thin and waterproof. Moreover, in the hot and cold repeated test and the accelerated weather resistance test, a slight fine crack was generated, and it was not qualified. Other studies were eligible.

[Comparative Example 4]
In producing this lightweight cellular concrete board, this panel was increased in the foaming agent in the raw material in Example 1 to 0.15 parts by weight, and the others were the same as in Example 1. The lightweight cellular concrete board had a bulk specific gravity of 0.32. A waterproof coating film was formed on the surface in the same manner as in Example 1.
The panel of Comparative Example 4 was unsuitable because of its low compressive strength. Other studies were eligible.

[Comparative Example 5]
In producing this lightweight cellular concrete board, this panel was the same as in Example 1 except that the foaming agent in the raw material in Example 1 was reduced to 0.08 parts by weight. The lightweight cellular concrete board had a bulk specific gravity of 0.44. A waterproof coating film was formed on the surface in the same manner as in Example 1.
The panel of Comparative Example 5 was not suitable because of a large initial evaporation amount. In addition, the thermal conductivity was high and was unqualified. Other studies were eligible.

[Comparative Example 6]
For this panel, a foam glass plate was used instead of the lightweight cellular concrete plate. The foam glass plate had a bulk specific gravity of 0.22. Its surface was sequentially deposited latex mortar 10000 g / m ² and an acrylic resin paint 200 g / m ^2.
The panel of Comparative Example 6 was unsuitable because of its low compressive strength. In addition, the initial evaporation amount was large and it was unqualified. Other studies were eligible.

[Comparative Example 7]
For this panel, a light-weight concrete pearlite concrete plate was used instead of the lightweight cellular concrete plate. The pearlite concrete board had a bulk specific gravity of 0.7. A waterproof coating was not formed on the surface.
The panel of Comparative Example 7 had a large initial evaporation amount and was not suitable. In addition, the thermal conductivity was high and was unqualified. Other studies were eligible.

<Test results>
The test results are shown in the following table. In the table, ○ indicates qualification. X indicates ineligibility.

The partially broken schematic cutaway perspective view of the heat insulation cold insulation panel in embodiment of this invention. The schematic longitudinal cross-sectional view of the liquid breakwater which stuck the heat insulation cold insulation panel. The general | schematic fragmentary longitudinal cross-section of the heat insulation cold insulation structure which stuck the heat insulation cold insulation panel on the bottom face of the liquid breakwater. The general | schematic fragmentary longitudinal cross-section of the heat insulation cold insulation structure which stuck the heat insulation cold insulation panel on the side of the liquid breakwater. The partial longitudinal cross-sectional schematic front view of the measuring apparatus of the initial evaporation amount of a cryogenic liquid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat insulation cold insulation panel 2 Lightweight foam concrete heat insulation board 3 Waterproof coating 4 Bolt hole for panel fixation 11 Liquid breakwater 12 Cryogenic liquid storage tank, storage tank 21 Concrete base 22 Dry mortar 23 Anchor bolt 31 Body 32 of liquid breakwater Bonding Layer 33 Anchor bolt 41 Insulated container 42 of initial evaporation measuring device Weight measuring device 43 of measuring device Test specimen 44 of measuring device Liquid nitrogen of measuring device

Claims (6)

In a panel that suppresses evaporation and boiling of low-temperature liquid that leaks into the breakwater from the storage tank by arranging it on the bottom or side of the breakwater surrounding the cryogenic liquid storage tank,
This panel is a lightweight aerated concrete insulation board, and a waterproof coating is attached to all or a part of the insulation board. panel.   The thickness of the waterproof coating is 50 µm or more, and is 40 times or less of the thickness of the lightweight cellular concrete insulation board. Insulated cold insulation panel.   The heat insulating cold insulation panel for a breakwater in a cryogenic liquid storage tank according to claim 1 or 2, wherein the paint of the waterproof coating is one or two of urethane resin paint and fluororesin paint.   Lightweight cellular concrete insulation board is composed of siliceous powder and calcareous powder as main raw materials, mixed with water and foaming agent into raw slurry, foamed and cured raw slurry, and autoclaved calcium silicate hydrate The heat insulation and cold insulation panel for a breakwater of a cryogenic liquid storage tank according to claim 1, wherein the air bubbles have a diameter of 0.2 mm or more and 50 vol% or more.   The lightweight cellular concrete heat insulating plate has a bulk specific gravity of 0.35 to 0.42 in an absolutely dry state and a thermal conductivity of 0.07 to 0.12 W / mK. A heat insulation and cold insulation panel for a breakwater of the cryogenic liquid storage tank according to any one of the above.   The heat insulation cold insulation panel according to any one of claims 1 to 5 is fixed to a bottom surface or a side surface in a breakwater surrounding a cryogenic liquid storage tank, and a surface with a waterproof coating of a lightweight cellular concrete heat insulating plate is exposed outdoors. Insulated and cold insulation structure of the breakwater in the cryogenic liquid storage tank, where the outdoor exposed surface is exposed to rain and snow, and the cryogenic liquid leaking from the storage tank into the breakwater is in contact.

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