JP5415590B2 - Insulation tank corrosion prevention structure - Google Patents

Description

  The present invention relates to a corrosion prevention structure for a thermal insulation tank comprising a thermal insulation material installed on the outer periphery of the thermal insulation tank and an exterior plate covering the thermal insulation tank. In addition, the present invention relates to a corrosion prevention structure for a heat retaining tank, which includes a heat insulating material on the lower side, and a connected exterior plate that connects exterior plates that respectively cover these heat retaining materials.

Conventionally, a heat insulating material made of rock wool or the like has been installed around the outer periphery of the lower side plate of the heat insulating tank. Furthermore, this heat insulating material was covered with an exterior plate made of steel or the like to prevent direct exposure to rainwater.
However, since there is a gap between the exterior board and the insulation tank floor board, rainwater enters through this gap. Furthermore, there is a problem that rainwater that has entered is absorbed by the heat insulating material and moisture directly contacts the metal tank side plate, causing corrosion. Further, since rainwater absorbed by the heat insulating material repeats drying and wetting, moisture gradually permeates around the tank side plate, and there is a problem that corrosion occurs in this portion after a certain period of time.
Therefore, in order to solve such problems, in recent years, a technology related to a corrosion prevention structure for a heat retaining tank has been developed, and several inventions and devices have already been disclosed in this regard.

Patent Document 1 discloses an invention relating to a corrosion prevention structure that can prevent rainwater from entering from the lower end portion of the outer surface of the storage tank under the name “corrosion prevention structure of the lower end portion of the outer surface of the outdoor storage tank”.
Hereinafter, the invention disclosed in Patent Document 1 will be described. The invention related to the corrosion prevention structure of the outer surface lower end portion of the outdoor storage tank disclosed in Patent Document 1, the outer surface lower end portion of the outdoor storage tank is annularly covered with a corrosion-resistant cover, and a vent hole is formed at the outer end of the cover. It is characterized by applying a rust and corrosion resistant material to the tank surface in the bar.
The anticorrosion structure for an outdoor storage tank having such a feature has the effect of preventing rainwater from entering from the lower end of the outer surface of the outdoor storage tank. Moreover, the dew condensation generated in the cover flows out due to the formation of the vent hole. Furthermore, by applying the rust and corrosion preventive material, the vicinity of the boundary between the tank side plate and the annular plate (annular plate) is prevented from being directly exposed to the circulating air. Accordingly, a waterproof and anticorrosive effect is exhibited in the cover provided at the lower end of the outer surface of the outdoor storage tank, and maintenance management of the storage tank can be facilitated.

Next, Patent Document 2 discloses an invention relating to a rainwater intrusion prevention structure having a structure in which a heat insulation exterior plate on a side wall of a high temperature water tank is extended downward under the name “a structure for preventing rainwater intrusion into a hot water tank floor plate”. ing.
The invention disclosed in Patent Document 2 is characterized in that, in a ground-installed high-temperature water tank, a concrete ring is disposed on the lower surface of the tank floor plate, and a heat insulating exterior plate on the outer periphery of the tank side wall is extended downward from the upper surface of the concrete ring. To do.
In the rainwater intrusion prevention structure having such a feature, rainwater that has flowed through the heat insulating exterior plate has an action of dripping onto the foundation without entering the tank floor plate. Moreover, it has the effect | action that the invasion of rain water to a tank floor board lower surface is prevented by raising a tank with a concrete ring. Therefore, it is possible to prevent corrosion of the tank side wall and the floor board, and since the heat insulating material can be applied to the tank floor board, heat loss can be remarkably reduced as compared with the conventional case.

JP 57-114486 A Japanese Utility Model Publication No. 1-66395

  However, in the invention disclosed in Patent Document 1, a plurality of covers are bonded to the tank while being joined. A sealing material is provided in the annular groove at the upper end of the cover, but such a description is not found in the joint. Therefore, there is a possibility that rainwater may enter from the joint, and in this case, corrosion of the tank may not be prevented.

  Next, in the invention disclosed in Patent Document 2, the length of the heat insulating exterior plate extending downward from the upper surface of the concrete ring is slightly shorter, and the end surface of the tank floor plate is in direct contact with the outside air. Therefore, in the case of rainwater with strong wind, it is considered that rainwater may enter the tank floor. Therefore, there is a possibility that corrosion of the tank cannot be prevented.

  The present invention has been made in response to such a conventional situation, and the upper and lower heat insulating materials that are installed to be raised to a certain height, respectively, and the exterior plates that respectively cover these heat insulating materials. It is an object of the present invention to provide a corrosion prevention structure for a heat retaining tank that can reliably prevent corrosion around a tank side plate.

In order to achieve the above object, the structure for preventing corrosion of a heat retaining tank according to the first aspect of the present invention includes a heat retaining material that is installed on the outer periphery of the side plate of the heat retaining tank to retain the contents in the heat retaining tank, and the heat retaining material. A vertical cross section provided on the outer plate that covers the outer periphery of the material to prevent rainwater from entering the heat insulating material and the bottom plate that protrudes to the outer periphery of the side plate of the heat insulating tank to reinforce the lower part of the heat insulating tank. A heat insulating tank corrosion prevention structure having a reinforcing member formed in a letter shape, wherein the heat insulating material is installed at a constant height inside the reinforcing member, An upper heat insulating material that is raised at a certain height on the upper surface of the ceiling, and the exterior plate has a lower exterior plate that covers the outer periphery of the lower heat insulating material and the bottom portion connected thereto, and the upper heat insulating material. An upper exterior plate covering the outer periphery of the material, and an upper And connecting the exterior plate for connecting the Soban and the bottom plate, characterized in that it is composed of.
In the corrosion prevention structure of the heat insulating tank having such a configuration, the lower heat insulating material and the upper heat insulating material are divided by the ceiling of the reinforcing member. Further, since the lower heat insulating material is installed inside the reinforcing member, the lower outer plate and the upper outer plate covering the outer periphery of the lower heat insulating material and the upper heat insulating material, respectively, are also divided. It has become. Regarding the material, the heat insulating tank, the exterior plate and the connection exterior plate are steel, and the heat insulating material is calcium silicate, rock wool or the like.
In such a structure, since the lower heat insulating material is installed at a certain height inside the reinforcing member, a space appears between the reinforcing member and the lower heat insulating material. In addition, since the upper heat insulating material is installed at a certain height on the upper surface of the ceiling of the reinforcing member, a space similarly appears between the upper surface of the reinforcing member and the upper heat insulating material. Therefore, since the lower part of both heat insulating materials can each ventilate, it has the effect | action that moisture does not stay. In addition, the height at which both the heat insulating materials are raised is, for example, about 50 mm. Moreover, as a supporting member for that purpose, for example, a steel lumber having a substantially T-shaped longitudinal section is used.
Furthermore, especially in the part where both the heat insulating materials are raised, when the lower exterior plate and the upper exterior plate do not cover these heat insulation materials, the above-mentioned ventilation is further promoted, so that the moisture increases. It has the effect | action that generation | occurrence | production of the dew condensation by is suppressed.
Further, since the connecting exterior plate connects the upper exterior plate and the bottom plate, one space is formed between the side plates of the heat insulation tank, and the lower heat insulation material and the upper heat insulation material are accommodated in this space. It will be. Therefore, it is prevented that rainwater penetrates beyond the lower exterior plate and the upper exterior plate, and does not reach the periphery of the side plates of the lower and upper heat insulating materials and the heat insulating tank.

Next, the corrosion prevention structure of the heat insulation tank according to the invention described in claim 2 is the corrosion prevention structure of the heat insulation tank according to claim 1, wherein the bottom plate projects outward from the ceiling of the reinforcing member, The upper end is fixed to the upper exterior plate to form the upper fixed portion, and the lower end is fixed to the outer end surface of the bottom plate to form the lower fixed portion, and the outer periphery of the lower fixed portion and the lower heat insulating material Is a distance equal to or greater than the distance between the upper fixing portion and the outer periphery of the upper heat insulating material.
In the anti-corrosion structure of the heat retaining tank having such a configuration, the bottom plate protrudes outward from the ceiling of the reinforcing member. Therefore, when the connecting exterior plate is not provided, the bottom plate is more than the ceiling of the reinforcing member. A lot of rainwater falls into the structure. Therefore, if a connecting exterior plate is provided and the distance between the lower fixing portion and the outer periphery of the lower heat insulating material is greater than the distance between the upper fixing portion and the outer periphery of the upper heat insulating material, the lower heat insulating material is reached. The effect of further reducing rainwater is exhibited. In addition, since the connecting exterior plate forms an upper fixing portion and a lower fixing portion, the connecting outer plate is firmly fixed to the outer end surfaces of the upper outer plate and the bottom plate, and the connecting outer plate is not displaced or dropped. Specifically, for example, the fixing portion is fixed by a screw that can replace the connecting exterior plate or locked by a locking member.

Furthermore, the corrosion prevention structure for a thermal insulation tank according to the invention described in claim 3 is the corrosion prevention structure for a thermal insulation tank according to claim 2, wherein both the upper fixing portion and the lower fixing portion are covered with a sealing material. It is characterized by a waterproof structure.
In the corrosion prevention structure of the heat retaining tank having such a structure, since the upper fixing portion and the lower fixing portion are both waterproof structures, these fixing portions have water tightness, and the connection exterior plate and the heat insulating tank Rainwater can be prevented from entering the enclosed space formed between the side plates. Specifically, for example, as the sealing material, a caulking material having a waterproof property and a rust-proof property, a packing, a gasket, and the like are used.

According to a fourth aspect of the present invention, there is provided a corrosion prevention structure for a heat retaining tank according to the second or third aspect of the present invention, wherein the lower adhering portion is capable of draining intruding rainwater. It is characterized by having.
In the structure for preventing corrosion of the heat insulation tank having such a structure, although the rainwater intrusion into the heat insulation tank side wall or the like is sufficiently prevented by the connecting exterior plate or the like, the drain is taken into consideration in the event that condensation still occurs. A hole is provided. In other words, the closed space formed between the connecting exterior plate and the side plate of the heat retaining tank has water tightness and air tightness, but it is also possible that condensation occurs due to changes in the ambient outside air temperature. It is. Therefore, having such a drain hole has an effect that condensation, which is excessive moisture, is naturally discharged.

And the corrosion prevention structure of the heat retaining tank according to the invention of claim 5 is the corrosion prevention structure of the heat retention tank according to any one of claims 1 to 4, wherein the upper surface of the bottom plate and the reinforcement member A rust preventive paint and a water resistant paint are applied to the upper surface of the wall surface and the ceiling of the reinforcing member, and at least the water resistant paint is applied in multiple layers.
In the corrosion prevention structure of the heat retaining tank having such a configuration, the waterproof paint is applied after the antirust paint is applied to the bottom plate or the like.
Of these, the water-resistant paint is applied in multiple layers, and is mainly intended to prevent moisture from penetrating into the tank side walls and the like. Therefore, even if condensation that occurs in the closed space between the connection exterior plate and the side plate of the heat retaining tank adheres to the side plate of the tank, the penetration of moisture into these portions is suppressed. The number of times of application of the water resistant paint may be multiple.
In addition, since rust-proof paint is applied between the waterproof paint and the bottom plate, for example, even if moisture penetrates from slight scratches on the painted surface of the waterproof paint, the occurrence of rust is prevented. The The anticorrosion paint may be applied in multiple layers, and the number of times is not particularly specified.

According to the structure for preventing corrosion of a heat retaining tank according to claim 1 of the present invention, since the heat retaining material below and above is raised, moisture is prevented from staying temporarily or for a long time. It is possible to prevent the occurrence of rust such as rust prevention effect. In addition, the connection exterior plate accommodates the lower heat insulating material and the upper heat insulating material, and prevents rainwater from reaching these heat insulating materials and the side plates of the heat insulating tank, so that a waterproof effect can be exhibited. Therefore, maintenance and management of the heat retaining tank can be facilitated and the useful life of the tank can be extended.
If moisture is stored as water in the reinforcing member and on the top surface of the ceiling, it becomes moisture again during drying and is released from both heat insulating materials. However, since the water is not absorbed by the heat insulating material due to the increase in the height, it is possible to prevent moisture from staying repeatedly for a long time.
In addition, such a heat insulation tank corrosion prevention structure raises the lower and upper heat insulating materials and connects the lower and upper outer cover plates respectively covering the lower and upper heat insulating plates, so that the simple technology This is also advantageous in terms of cost. Furthermore, it is possible to install not only a new heat retaining tank but also an existing tank with a slight improvement.
In addition, although it is thought that the heat insulation effect of a heat retention tank generate | occur | produces by raising both heat insulating materials, since the raised height is as small as about 50 mm, it does not need to worry.

According to the anti-corrosion structure of the heat retaining tank according to claim 2 of the present invention, in addition to the effect of the invention according to claim 1, rainwater reaching the heat retaining material below can be further reduced. Since the lower heat insulating material is installed on the bottom plate from which more rainwater falls than the ceiling of the reinforcing member, rain water absorbed by the lower heat insulating material is more efficiently reduced.
Moreover, since the connection exterior plate is firmly fixed by the fixing portion and does not shift or drop, a stable rustproofing / waterproofing effect is exhibited over a long period of time. On the other hand, since the fixed portion allows the connection exterior plate to be replaced, the heat insulating material can be inspected and replaced.

  According to the structure for preventing corrosion of a heat retaining tank according to claim 3 of the present invention, in addition to the effect of the invention according to claim 2, rainwater can be prevented from entering from the fixed portion of the connected exterior plate. It is possible to avoid the disadvantage caused by installing the plate. Therefore, generation | occurrence | production of the moisture in the closed space formed between a connection exterior board and the side plate of a heat retention tank can be suppressed.

  According to the structure for preventing corrosion of a heat retaining tank according to claim 4 of the present invention, in addition to the effect of the invention according to any one of claims 1 to 3, the connection outer plate and the side plate of the heat retaining tank Since the moisture in the closed space is naturally discharged, the amount of moisture in the closed space can always be adjusted to a saturation state or less. Therefore, it is possible to suppress the occurrence of rust caused by changes in the outside air temperature.

  According to the corrosion prevention structure of the heat retaining tank according to claim 5 of the present invention, in addition to the effect of the invention according to any one of claims 1 to 4, the tank is made of rust preventive paint and multiple waterproof paints. Since the penetration of moisture into the side walls and the like is suppressed and the generation of rust is suppressed, corrosion of the heat retaining tank can be reliably prevented.

1 is a longitudinal sectional view of a corrosion prevention structure for a heat retaining tank according to Example 1. FIG. It is an AA arrow line view of FIG. It is a longitudinal cross-sectional view of the corrosion prevention structure of the heat retention tank which concerns on Example 2. FIG.

The heat insulation tank corrosion prevention structure of Example 1 according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2 (mainly corresponding to claims 1 to 4).
In addition, about the component shown in FIG. 1, the same code | symbol is attached | subjected also in FIG. 2, and the description is abbreviate | omitted.
FIG. 1 is a longitudinal cross-sectional view of a corrosion prevention structure for a heat retaining tank according to a first embodiment.

As shown in FIG. 1, the insulation tank corrosion prevention structure 1 of the present embodiment is provided slightly above the ground surface 17 and the side wall 3 that is installed perpendicularly to the ground surface 17 and is provided around the heat insulation tank 2. Bottom plate 4, flange 5 parallel to bottom plate 4, reinforcing member 6 installed on bottom plate 4, heat insulating materials 7 and 8, and exterior plates 11 to 13. Among these, the side wall 3, the bottom plate 4, the flange 5, the reinforcing member 6 and the exterior plates 11 to 13 are made of steel, and the heat insulating materials 7 and 8 are made of calcium silicate and rock wool, respectively.
Further, the reinforcing member 6 has a substantially U-shaped longitudinal section, and is formed of a ceiling 6a, a vertical inner wall 6b, and a floor surface 6c. The lower heat insulating material 7 is supported by the fixing member 9 and is raised from the floor surface 6 c and accommodated inside the reinforcing member 6. On the other hand, the upper heat insulating material 8 is supported by the heat insulating material receiver 10 between the ceiling 6 a and the flange 5 and raised from the upper surface of the ceiling 6 a, and is closely attached to the lower surface of the flange 5. The height of the raising is about 50 mm in all cases. The heat insulating material receiver 10 is made of steel, and has a structure in which a plurality of leg portions 10b that are provided at regular intervals are supported by a flat plate portion 10a. The fixing member 9 is a steel rod-like body, and the tip that penetrates the lower exterior plate 11 and the lower heat insulating material 7 is fixed to the vertical inner wall 6 b of the reinforcing member 6. The upper exterior plate 12 is screwed (not shown) to the connection exterior plate 13 at the upper fixing portion 13a.

Next, the lower exterior plate 11 and the upper exterior plate 12 have a structure in which the lower portions are not extended to the height portions raised by the fixing member 9 and the heat insulating material receiver 10, respectively. Among these lower portions, the lower exterior plate 11 is formed with a corner portion 11a having a right angle. And the connection exterior board 13 is adhering to the surface of the upper exterior board 12, and the baseplate end surface 4a. This connecting exterior plate 13 is formed by integrally forming an upper vertical portion 13b, a horizontal portion 13c, a lower vertical portion 13d, and a lower fixed portion 13e following the upper fixed portion 13a.
Further, the horizontal distance (X in the figure) between the lower vertical portion 13d and the lower heat insulating material 7 is several times compared to the horizontal distance (Y in the drawing) between the upper fixing portion 13a and the upper heat insulating material 8. It is about twice as long. Since the lower vertical portion 13d is substantially in the vertical direction of the lower fixing portion 13e, the horizontal distance (X ′ in the figure) between the lower fixing portion 13e and the lower heat insulating material 7 is substantially the same. And the upper end of the upper exterior plate 12 is in close contact with the flange 5 and has no gap.
Further, the upper fixing portion 13a is covered with a sealing material 14a, and the lower fixing portion 13e is covered with a sealing material 14b. Further, the lower fixing portion 13e has a structure in which the lower plate end face 4a is tightly fixed by the exterior plate fixing bolt 15. In addition, a drain hole 16 is formed in the lower fixing portion 13e. The sealing materials 14a and 14b are caulking materials having waterproofness and rust prevention properties.

Next, the corrosion prevention structure 1 for a heat retaining tank according to the first embodiment will be described with reference to FIG. FIG. 2 is a view taken along line AA in FIG.
As shown in FIG. 2, the lower heat insulating material 7 is penetrated by the fixing member 9, and the upper heat insulating material 8 is supported by the heat insulating material receiver 10. The leg portion 10 b of the heat insulating material receiver 10 is fixed to the upper surface of the ceiling 6 a of the reinforcing member 6 by welding. Further, the lower vertical portion 13d is fixed to the bottom plate end surface 4a by a plurality of exterior plate fixing bolts 15 at regular intervals.
In addition, although the thermal insulation tank is substantially columnar shape and is not illustrated, the corrosion prevention structure 1 of a plurality of thermal insulation tanks is installed in parallel in this circumferential direction. Therefore, the upper exterior board 12 and the connection exterior board 13 of each pair have a junction part, and this junction part is waterproofed by the sealing material.

According to the corrosion prevention structure 1 of the heat retaining tank of the present embodiment, the lower space S ₁ between the floor surface 6 c and the lower heat insulating material 7, and the upper space between the ceiling 6 a and the upper heat insulating material 8. and S _2, it appears. Further, a closed space S that is surrounded by the side wall 3, the flange 5, the upper exterior plate 12, the connection exterior plate 13, the bottom plate 4, and the reinforcing member 6 appears. Since the lower heat insulating material 7 and the upper heat insulating material 8 are accommodated in the closed space S, rainwater falls on these heat insulating materials 7 and 8 and reaches the side wall 3, the bottom plate 4, and the reinforcing member 6. Is prevented.
Furthermore, in the spaces S ₁ and S ₂ , the lower part of the lower exterior plate 11 and the upper exterior plate 12 do not extend to the upper surfaces of the floor surface 6c and the ceiling 6a, respectively, and therefore ventilation between the spaces S ₁ and S ₂ . Is promoted, and the occurrence of condensation due to an increase in moisture in the closed space S is suppressed. Further, the corner portion 11 a of the lower exterior plate 11 supports the lower heat insulating material 7 together with the fixing member 9.

Next, when the connection exterior board 13 is not provided, the amount of rainwater reaching the lower heat insulating material 7 is larger than that reaching the upper heat insulating material 8 due to the structure. Therefore, by providing the connecting exterior plate 13 and making the horizontal distance X as long as several times the horizontal distance Y, rainwater reaching the heat insulating material 7 below is further reduced, and the size of the closed space S is expanded. Thus, the ventilation between the space S ₁ and the space S ₂ described above is further promoted.
Further, since the connecting exterior plate 13 is fixed by screws at the upper fixing portion 13a and fixed by the outer plate fixing bolt 15 at the lower fixing portion 13e, the connecting outer plate 13 is not displaced or dropped. Furthermore, since the upper fixing portion 13a and the lower fixing portion 13e are respectively covered with the sealing materials 14a and 14b, water tightness is exhibited in these portions. In addition, since the upper end of the upper exterior plate 12 is in close contact with the flange 5, the upper exterior plate 12 to the lower fixing portion 13 e, that is, the closed space S, has a high water-tightness throughout. Moreover, having watertightness means having high airtightness at the same time. And since the corrosion prevention structure 1 of a plurality of sets of heat retaining tanks is arranged in parallel in the circumferential direction of the tank and the joint portions that are waterproofed are connected to each other, the heat retaining tank is surrounded by the closed space S. Will be. Accordingly, it is possible to prevent rainwater from entering beyond the upper exterior plate 12 and the connection exterior plate 13 over the entire circumference of the heat retaining tank.

  As described above, the closed space S has high water tightness and air tightness over the entire space, but it is also conceivable that dew condensation occurs due to a change in ambient outside air temperature. Therefore, when the drain hole 16 is penetrated into the lower fixing portion 13e, condensation is discharged, and the humidity in the closed space S is naturally adjusted so as not to be excessive.

As described above, according to the heat insulation tank corrosion prevention structure 1 of the present embodiment, rainwater is prevented from reaching the heat insulation materials 7 and 8, the side wall 3, the bottom plate 4, and the reinforcing member 6. Moisture that causes corrosion of water does not enter, and corrosion of the heat retaining tank can be prevented. Further, ventilation between the spaces S ₁ and S ₂ is promoted, and in addition, the closed space S is expanded by extending the horizontal distance X to several times the horizontal distance Y. It is possible to prevent moisture from staying for a long time. Therefore, it is possible to prevent the heat insulating materials 7 and 8 from absorbing moisture, and to prevent the heat insulating tank from being corroded over a long period of time.
Furthermore, since the closed space S has high watertightness and airtightness due to the close contact between the sealing members 14a and 14b and the upper exterior plate 12 and the flange 5, it is possible to inhibit slight rainwater and moisture from entering. On the other hand, since the drain hole 16 is pierced, in the unlikely event that condensation occurs, it can be discharged. As described above, the corrosion prevention structure 1 of the heat retaining tank is provided with multiple countermeasures for the purpose of waterproofing and rust prevention.
Further, the lower heat insulating material 7 and the lower exterior plate 11 are penetrated by the fixing member 9, and the fixing member 9 is fixed to the vertical inner wall 6 b of the reinforcing member 6. There is no movement or dropping. And since the upper heat insulating material 8 is sandwiched and accommodated between the heat insulating material receiver 10 and the flange 5, and the leg portion 10b is welded and fixed to the upper surface of the ceiling 6a of the reinforcing member 6, the upper heat insulating material is similarly provided. It can avoid that 8 falls. Therefore, even if water is stored on the upper surface of the floor surface 6 and the ceiling 6a, the lower heat insulating material 7 and the upper heat insulating material 8 are prevented from absorbing this. Therefore, it is possible to prevent the heat retaining materials 7 and 8 from releasing this moisture during drying and retaining moisture for a long period of time.
Next, since the upper exterior plate 12 is fixed to the connection exterior plate 13 with screws, and the connection exterior plate 13 is secured to the bottom plate end surface 4a, the upper exterior plate 12 is firmly supported by the bottom plate 4 together with the connection exterior plate 13. Is done. Therefore, the heat insulating materials 7 and 8, the exterior plates 11 and 12, and the connection exterior plate 13 have almost no possibility of distortion or displacement due to vibration, and have sufficient earthquake resistance.

  In addition, the structure of the corrosion prevention structure of the heat retaining tank of the present invention is not limited to that shown in this embodiment. For example, the close contact portion between the upper exterior plate 12 and the flange 5 may be covered with a sealing material. Further, the number and size of the drain holes 16 are not particularly limited.

The heat insulation tank corrosion prevention structure of Example 2 according to the embodiment of the present invention will be described in detail with reference to FIG. 3 (mainly corresponding to claim 5).
In addition, about the component shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
FIG. 3 is a longitudinal cross-sectional view of the corrosion prevention structure for a heat retaining tank according to the second embodiment.
As shown in FIG. 3, the anti-corrosion paint 1 and the waterproof paint 19 are applied to the heat insulation tank corrosion prevention structure 1a of this embodiment in addition to the heat insulation tank corrosion prevention structure 1. These paints 18 and 19 follow a part of the side wall 3 facing the upper heat insulating material 8, the upper and lower surfaces and end surfaces of the ceiling 6 a of the reinforcing member 6, the vertical inner wall 6 b and the floor surface 6 c, the upper surface of the bottom plate 4 and It is applied over the entire bottom plate end face 4a. These rust preventive paints 18 are applied once to the above surface, and the waterproof paint 19 is applied three times on the rust preventive paint 18. The waterproof paint 19 is an epoxy resin special swelling charcoal paint.
Other configurations are the same as those of the heat insulation tank corrosion prevention structure 1 according to the first embodiment.

  According to the heat insulation tank corrosion prevention structure 1a of the present embodiment, when the heat insulation materials 7 and 8 absorb moisture generated in the closed space S by the multiple waterproof paints 19 or when dew condensation occurs on the side wall 3 of the tank. Even if it adheres, the penetration of moisture into these parts is suppressed. Further, the rust preventive paint 18 prevents the generation of rust even when moisture penetrates the waterproof paint 19. Other functions are the same as those of the insulation tank corrosion prevention structure 1 according to the first embodiment.

As described above, according to the insulation tank corrosion prevention structure 1a of the present embodiment, the penetration of moisture into the side walls 3 and the like, and thus the generation of rust, is suppressed by the antirust coating material 18 and the multiple waterproof paints 19. Therefore, corrosion of the heat retaining tank can be surely prevented.
Other effects are the same as those of the insulation tank corrosion prevention structure 1 according to the first embodiment.

  In addition, the structure of the corrosion prevention structure of the heat retaining tank of the present invention is not limited to that shown in this embodiment. For example, the rust preventive paint 18 may be applied one or more times, and the waterproof paint 19 may be applied a plurality of times other than three times. Further, the surface to be applied may be at a position other than that illustrated.

  The invention described in claims 1 to 5 can be used as a corrosion prevention structure for a heat insulating tank including a heat insulating material installed in the outer periphery of the heat insulating tank and an exterior plate covering the heat insulating material.

  DESCRIPTION OF SYMBOLS 1, 1a ... Corrosion prevention structure of heat insulation tank 2 ... Inside of heat insulation tank 3 ... Side wall 4 ... Bottom plate 4a ... Bottom plate end surface 5 ... Flange 6 ... Reinforcement member 6a ... Ceiling 6b ... Vertical inner wall 6c ... Floor surface 7 ... Lower heat insulation material 8 ... Upper heat insulating material 9 ... Fixing member 10 ... Heat insulating material receiver 10a ... Flat plate portion 10b ... Leg portion 11 ... Lower exterior plate 11a ... Square portion 12 ... Upper exterior plate 13 ... Linked exterior plate 13a ... Upper fixing portion 13b ... Upper vertical portion 13c ... Horizontal portion 13d ... Lower vertical portion 13e ... Lower fixing portion 14a, 14b ... Sealing material 15 ... Exterior plate fixing bolt 16 ... Drain hole 17 ... Ground surface 18 ... Rustproof paint 19 ... Waterproof paint

Claims (5)

A heat insulating material installed on the outer periphery of the side plate of the heat insulating tank to retain the contents in the heat insulating tank, an outer plate for covering the outer periphery of the heat insulating material and preventing rainwater from entering the heat insulating material, And a reinforcing member having a U-shaped longitudinal section provided on a bottom plate projecting from the outer periphery of the side plate of the heat retaining tank to reinforce the lower portion of the heat retaining tank. And
The heat insulating material is a lower heat insulating material that is raised and installed at a certain height inside the reinforcing member, and an upper heat insulating material that is raised and installed at a constant height on the upper surface of the ceiling of the reinforcing member, With
The exterior plate includes a lower exterior plate that covers an outer periphery of the lower heat insulating material and a bottom portion connected thereto, an upper exterior plate that covers an outer periphery of the upper heat insulating material, and the upper exterior plate; A connecting exterior plate that connects the bottom plate;
A corrosion prevention structure for a thermal insulation tank, characterized by comprising: The bottom plate protrudes outward from the ceiling of the reinforcing member;
The connection exterior plate has an upper end fixed to the upper exterior plate to form an upper fixed portion, and a lower end fixed to the outer end surface of the bottom plate to form a lower fixed portion,
The heat insulation according to claim 1, wherein a distance between the lower fixing portion and the outer periphery of the lower heat insulating material is equal to or more than a distance between the upper fixing portion and the outer periphery of the upper heat insulating material. Tank corrosion prevention structure.   The anti-corrosion structure for a heat retaining tank according to claim 2, wherein both the upper fixing portion and the lower fixing portion are waterproof structures covered with a sealing material.   The structure for preventing corrosion of a heat retention tank according to claim 2 or 3, wherein the lower fixing portion has a drain hole so that rainwater that has entered can be discharged. A rust preventive paint and a water resistant paint are applied to the upper surface of the bottom plate, the inner wall surface of the reinforcing member, and the upper surface of the ceiling of the reinforcing member, and at least the water resistant paint is applied in multiple layers. The corrosion prevention structure for a heat retaining tank according to any one of claims 1 to 4.

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