JP4482191B2 - Basics of storage tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foundation for supporting a storage tank for storing various liquids, such as a swimming pool, a storage tank, and an oil tank.
[0002]
[Prior art]
The swimming pool for storing water among the storage tanks for storing various liquids will be described as an example with reference to FIG.
[0003]
As shown in FIG. 4, the swimming pool 21 body is formed in a liquid-tight box shape from the bottom plate 23 and the side plate 24 so as to store the pool water 22, and an overflow groove 25 is formed around the upper edge of the side plate 24. And a pool deck 26 are provided.
[0004]
The bottom plate 23 and the side plate 24 are integrally joined by welding or welding using a thin flat plate made of a metal material such as iron, aluminum or stainless steel, or a synthetic resin material such as fiber reinforced plastics. Has been.
[0005]
The side base plate 28 that supports the lower portion of the side plate 24 is formed in a thick standing wall shape made of concrete or the like and has a rigid structure. The side plate 24 is vertically fixed to the upper surface of the side base plate 28 and the outer periphery of the side plate 24 is fixed. Is supported by a side support member 27 made of a shape steel material such as an angle material or a channel material.
[0006]
The foundation 31 at the bottom of the bottom plate 23 is provided on the inner side surrounded by the side base plate 28, and is formed on a horizontal floor plate with concrete, or crushed stones are arranged and solidified with gravel, and then discarded. The bottom base plate 29 is provided by applying concrete, and a support layer 30 is provided on the bottom base plate 29.
[0007]
For the support layer 30 provided on the foundation 31, generally a thick foundation sand having a thickness of about 10 centimeters to 60 centimeters, for example, which is necessary for elastically supporting the storage tank body is used. Even when subjected to load fluctuations such as pool water 22, it is formed so as to follow well with bottom plate 23 which causes deflection and deformation and to obtain elasticity by fluctuation of gaps between particles of foundation sand. Has been. The foundation sand used for the support layer 30 is generally mountain sand or river sand that is inexpensive and easily available.
[0008]
[Problems to be solved by the invention]
In the conventional foundation 31 as shown in FIG. 4, the general foundation sand used for the support layer 30 contains a lot of extremely fine soil or clay, such as powder, or a lot of fine and fine particles of sand. Therefore, when used for a long time, it was consolidated and solidified, and its elasticity was lowered. For this reason, the support layer 30 is difficult to follow the bottom plate 23 which is deformed by a load variation such as the pool water 22.
[0009]
In addition, the foundation sand may contain many components that promote corrosion, such as chlorine ions and sulfate ions, and may contain many impurities such as soil and organic matter, moisture, and the like. When the main body is formed of a metal material such as iron, aluminum, stainless steel, etc., there is a possibility that corrosion proceeds on the back surface of the bottom plate 23 that is in contact with the foundation sand. In particular, when a stainless steel material is used, the weld heat-affected zone on the back surface of the welded portion of the bottom plate 23 is caused by high heat generated by welding, so that components having corrosion resistance such as chromium are precipitated between crystal grains. There was a tendency for the uniform corrosion resistance to deteriorate and for local corrosion to proceed in the vicinity of the weld. When the bottom plate 23 was perforated and the pool water 22 leaked due to corrosion, the leaked pool water 22 stayed in the support layer 30 and further promoted corrosion of the bottom plate 23. Therefore, when there is a structure below or around the pool 21 such as an indoor pool, there is a concern that damage may be caused by flooding.
[0010]
As described above, the foundation 31 that has been consolidated and solidified and has reduced elasticity, or the existing pool 21 in which the back surface of the bottom plate 23 made of a metal material has been corroded and has a hole, 23 repairs and replacements were required.
[0011]
When the foundation 31 of the existing pool 21 is to be repaired, it is necessary to carry out a large amount of heavy foundation sand of the support layer 30 and dispose of the old and dirty foundation sand as industrial waste. Industrial waste treatment also had problems in terms of protecting the natural environment. In addition, it took a lot of labor and cost to carry in and install new, large and heavy foundation sand that is clean and hard and durable and does not contain impurities such as soil and organic matter.
[0012]
The object of the present invention has been made in view of the above-mentioned problems of the prior art, and maintains the elasticity of the foundation, provides the corrosion resistance of the bottom plate back surface, and is used as the foundation of a storage tank with improved durability. Is. Moreover, in the foundation of the existing storage tank, without replacing the entire existing foundation, only a part of the upper layer is easily and easily replaced, and the foundation is excellent in durability.
[0013]
[Means for Solving the Problems]
The foundation for supporting the storage tank according to the present invention includes a bottom base plate in the lowermost horizontal plate, a side base plate surrounding the outer periphery of the bottom base plate, and an inner bottom base plate surrounded by the side base plate. A lower support layer provided on the upper side of the lower support layer, and a waterproof flexible membrane body having a peripheral edge fixed to the inner wall surface of the side base plate, and an upper portion of the flexible membrane body. It is formed with an elastic upper support layer that does not contain corrosive components, the upper support layer is composed of an upper support material made of No. 7 crushed stone or crushed sand, and the lower support layer is formed by foaming synthetic resin The lower support material is made up of .
[0014]
Further, the peripheral edge portion of the flexible film body is bent and extended along the side inner wall surface, is raised vertically upward, and a belt-like presser plate provided with a plurality of attachment holes is provided. The plurality of mounting holes are inserted into the mounting member embedded in the inner wall surface and applied to the raised portion and tightened by the tightening member, thereby being fixed in close contact with the side base plate .
[0015]
Further, the peripheral edge portion of the flexible film body is bent and extended along the side inner wall surface, raised vertically upward, extended to the upper surface of the side base plate and folded, and the bottom plate of the storage tank thereon Is fixed .
[0018]
DETAILED DESCRIPTION OF THE INVENTION
The foundation of the storage tank according to the present invention will be described with reference to FIGS. 1 to 3 by taking the foundation of a swimming pool for storing water as an example.
[0019]
FIG. 1 is an explanatory side sectional view showing an embodiment of the foundation of a swimming pool, and FIG. 2 is an enlarged view of a part of FIG.
[0020]
The bottom plate 3 and the side plate 4 of the pool 1 main body are integrated by welding or welding using a thin flat plate made of a metal material such as iron, aluminum or stainless steel, or a synthetic resin material such as fiber reinforced plastic. To form a liquid-tight box. In addition, 5 is an overflow ditch of the pool water 2, and 6 is a pool deck.
[0021]
The side base plate 8 that supports the lower part of the side plate 4 is formed in a thick wall shape with a rigid structure made of a concrete body or the like, and the side plate 4 is placed and erected on the upper surface of the side base plate 8. Is supported vertically by a side support member 7 made of a shape steel material such as an angle material or a channel material.
[0022]
The base 10 for supporting the bottom plate 3 is provided on the inner side of the side base plate 8 surrounded by the outer periphery. The bottom base plate 9 on the lowermost horizontal plate and the lower portion provided on the bottom base plate 9 are provided. Provided on the support layer 11, the lower support layer 11, the flexible film body 12 having waterproofness with the periphery fixed to the inner wall surface of the side base plate 8, and the flexible film body 12. And an upper support layer 13 having elasticity that does not contain corrosive components.
[0023]
The bottom base plate 9 provided at the bottom of the foundation 10 is formed on a horizontal plate-like floor body such as reinforced concrete in the case of an indoor pool or the like inside a building, or in the case of an outdoor pool or the like installed on the ground. Arranged quarry stones, spread gravel, and then throw it away and cast concrete to form a horizontal plate-like rigid structure.
[0024]
The lower support layer 11 provided on the upper portion of the bottom base plate 9 uses, for example, foundation sand such as mountain sand or river sand that is generally inexpensive and easily available. The lower support layer 11 using such foundation sand has elasticity and is a tightened support layer. Further, as the lower support layer 11, for example, among the single-grain crushed stones defined in JIS A5001 “road crushed stone”, the single-grain crushed stone having the nominal name S-5 (No. 7) having a particle size of about 2.5 to 5 millimeters. In other words, when using crushed stone of the common name No. 7, or when using crushed sand specified in JIS A5005 “Crushed stone for concrete and crushed sand”, that is, crushed sand having a particle size of 5 mm or less, it is hard and durable. In addition, since it does not contain impurities such as thin stone pieces, elongated stone pieces, or dust, mud, organic matter, etc., there are more voids between the particles than the above-mentioned general basic sand, and the elasticity is improved.
[0025]
In addition, when a lower support material formed by foaming a synthetic resin, for example, a lower support material such as a polystyrene foam board material, is used as the lower support layer 11, it is lightweight, durable, homogenized and high. Improvement of porosity, elasticity, weight reduction of foundation, etc. can be achieved. Thus, when the lower support layer 11 is reduced in weight, the weight burden on the bottom base plate 9 that supports the lower portion is reduced, and the strength of the support floor that becomes the bottom base plate 9 can be reduced. It becomes a structure suitable for the foundation 10 of the pool 1 provided indoors or on the roof of a building. In this case, even if the support layers 11 and 13 provided above and below the flexible film body 12 are elastic, the flexible film body 12 can flexibly cope with it, so that an excessive load or restraining force is not applied to the bottom plate 3. Can respond gently.
[0026]
The flexible membrane 12 spread on the upper surface of the lower support layer 11 is made of a waterproof material that does not allow water to pass through, for example, a synthetic rubber material such as ethylene / propylene rubber or butyl rubber, vinyl chloride resin, ethylene vinyl acetate resin. For example, a synthetic resin material such as fabric or a material waterproofed on the upper and lower surfaces of a base fabric such as fabric, with a thickness of about 0.5 to several millimeters and a width of several tens to several meters. In addition, a flexible sheet body having a length of about several tens of meters is used.
[0027]
The flexible film body 12 made of the sheet body is spread on the upper surface of the lower support layer 11, and the peripheral edges of the sheet bodies are overlapped by about several centimeters to several tens of centimeters. And this overlapped part is selected from adhesives such as butyl rubber, chloroprene rubber, or acrylic resin that are suitable for the material of the sheet body and have excellent adhesive performance. To do.
[0028]
For example, as shown in FIG. 2, the peripheral portion of the flexible film body 12 is bent and extended along the inner wall surface of the side base plate 8 immediately below the side plate 4, and rises vertically upward. Then, for example, a thin flat plate such as a hardware such as a stainless steel plate, that is, a belt-like presser plate 14 provided with a plurality of anchor attachment holes is brought into close contact with the raised portion, and an attachment member 15 such as a hole-in anchor, for example. Is embedded in the inner wall surface of the side base plate 8, and the nut at the tip is tightened and fixed. Alternatively, although not shown, if the peripheral portion of the flexible film body 12 is extended to the upper surface of the side base plate 8 and folded, and the bottom plate 3 is placed thereon, the peripheral edge of the flexible film body 12 is formed. It is easy to fix the part and the liquid tightness is improved. In addition, for example, a synthetic rubber primer, a synthetic rubber adhesive, a mortar or a synthetic resin filler, a rubber or silicone sealant, and the like are applied to the fixing portion on the periphery of the flexible film body 12. Adhesion and liquid tightness are improved.
[0029]
The flexible film body 12 formed as described above keeps the liquid-tight space between the upper and lower support layers 11 and 13 and blocks moisture and the like from moving in the vertical direction. The flexible membrane body 12 freely expands and contracts and moves up and down depending on the flexibility of the flexible membrane body 12 and the like. As it can follow freely, etc., durability and liquid tightness are maintained without tearing or aging.
[0030]
The upper support layer 13 provided on the upper part of the flexible film body 12 is, for example, the above-mentioned commonly known No. 7 crushed stone or crushed sand, which is hard, durable, thin stone piece or elongated stone piece, or dust, mud, Use an upper support with a uniform and coarse particle shape that does not contain impurities such as organic matter. In such a coarse upper support material such as No. 7 crushed stone, the surface of the particles has sharp irregularities, and there are many voids between the particles, and when the load increases, they are intricately engaged and gradually fill the voids. When the volume changes and the load decreases, the volume is restored. Therefore, the upper support layer 13 using such an upper support material follows the bottom plate 3 which deforms due to increase / decrease in the load such as the pool water 2 and elastically absorbs the displacement. Can be maintained. In addition, the upper support layer 13 formed using the upper support material such as No. 7 crushed stone contains almost no components or impurities that promote corrosion, such as chloride ions, sulfate ions, moisture, soil, and organic matter. Corrosion prevention of the back surface of the metal bottom plate 3 applied to the upper surface is achieved.
[0031]
In addition, the upper support layer 13 using the upper support material made of No. 7 crushed stone or crushed sand protects the lower flexible film body 12 without transferring welding heat when the bottom plate 3 is constructed on the upper surface thereof, The flexible membrane body 12 is not burned or damaged. Moreover, the upper support layer 13 with many voids also has a role of absorbing and dispersing the heat of welding to prevent deterioration due to high temperatures in the vicinity of the weld.
[0032]
FIG. 3 shows a slope having an inclination angle through which water flows naturally, that is, a flexible membrane body 12 is spread on the upper surface of the lower support layer 11 so as to obtain a natural slope, and the vicinity of the drain groove 16 at the bottom of the pool. The drainage ports 17 and 17 are provided on the upper portion of the flexible film body 12 at the lowest position. The drain port 17 is formed by, for example, using a piping material provided with a large number of water collecting holes, or a half-divided pipe material, and extending the terminal portion of the piping material. Is discharged to the outside.
[0033]
In the case where the drainage port 17 is provided in this way, in the unlikely event that the pool water 2 leaks into the upper support layer 13 from the bottom plate 3, the leakage is quickly discovered and the leaked water is retained. It can be discharged to the outside as soon as possible. Further, the air permeability and drainage in the upper upper support layer 13 shielded by the flexible film body 12 are improved, and the inside of the upper support layer 13 can be kept well dried. Accordingly, when the pool 1 is provided indoors or on the roof of the structure, the drainage port 17 is provided, so that there is no concern that condensed water or leaked water penetrates into the lower floor.
[0034]
The case of refurbishing the existing pool foundation is described in detail below. Generally, an existing foundation is provided with a support layer of foundation sand having a thickness of about 10 cm to 60 cm. For existing foundations that have been used for a long time and have been hardened by consolidation and reduced in elasticity, or existing foundations that have been corroded on the bottom of the bottom plate, support the upper and lower sides as described in detail above by unloading the old foundation sand support layer. The new base plate 10 having the layers 11 and 13 and the flexible film body 12 provided therebetween is repaired and the new bottom plate 3 is constructed.
[0035]
Alternatively, without replacing the entire existing foundation, a part of the surface layer of the existing support layer, that is, a layer having a thickness that can gently support the bottom plate 3 and a necessary minimum thickness is replaced and repaired. In this case, for example, the surface layer is scraped thinly by a thickness of about 2 to 10 centimeters, the flexible film body 12 is spread on the upper surface of the remaining existing support layer, and the above-mentioned No. 7 crushed stone is placed on the upper part. A new upper support layer 13 is formed by applying an upper support material such as.
[0036]
Thus, when replacing and repairing only a part of the surface layer without replacing the entire support layer of the existing thick foundation sand, it is not necessary to carry out a large amount of heavy foundation sand, and a large amount of heavy foundation sand. No new upper support layer 13 is carried in. In addition, there is less industrial waste treatment of old soiled foundation sand, which is excellent from the viewpoint of protecting the natural environment. In addition, the construction period for repairing the foundation is shortened and the economy is improved.
[0037]
The repaired foundation is blocked by the flexible membrane body 12 from the foundation sand containing the corrosive components contained in the existing support layer, and the rise of corrosive components such as chlorine ions, sulfate ions and moisture is prevented, Moreover, since it does not mix with the lower foundation sand, the back surface corrosion of the metal bottom plate 3 is prevented. And since the new upper support layer 13 is provided via the flexible film body 12, it follows the bending and deformation | transformation of the baseplate 3, and becomes the foundation of the pool excellent in elasticity and durability.
[0038]
In addition to the metal pool 1 described in detail above, a thin plate made of a synthetic resin material such as fiber reinforced plastics, etc., and a pool 1 that is integrally joined by welding or the like to form the bottom plate 3 or the like In this case, there is no concern about the back surface corrosion of the bottom plate 3, but when the foundation is hardened by consolidation and contact with the upper bottom plate 3 is deteriorated, the existing foundation is used as described above. By providing the flexible film body 12 and the upper support layer 13 on the upper part of the substrate, the foundation 10 having excellent elasticity and durability can be repaired.
[0039]
In addition, although the above embodiment details the basics of the swimming pool for storing water, it repeatedly bends in response to changes in liquid load, temperature changes, etc., such as a storage tank for storing liquid such as water and oil. Needless to say, the present invention can be similarly applied to a flexible foundation having a thin flat bottom plate that is deformed and formed using foundation sand or the like.
[0040]
【The invention's effect】
As is apparent from the above description, the foundation of the storage tank according to the present invention is surrounded by the bottom horizontal plate-shaped bottom base plate, the side base plate surrounding the outer periphery of the bottom base plate, and the side base plate. A lower support layer provided on the inner bottom base plate, a waterproof flexible membrane body provided on an upper portion of the lower support layer and having a peripheral edge fixed to the inner wall surface of the side base plate, and the flexible membrane The flexible film body easily follows the deformation of the lower support layer and the upper support layer, as well as moisture and corrosiveness, because it is formed with the elastic upper support layer that does not contain corrosive components. Since the upper support layer has elasticity and does not contain corrosive components, the load on the bottom plate is elastically supported, and the corrosion resistance of the bottom plate back surface is obtained, resulting in excellent durability. Can be the basis.
Furthermore, the upper support layer formed using the upper support material made of No. 7 crushed stone or crushed sand well follows the bottom plate that deforms due to the increase or decrease of the load such as pool water, and elastically absorbs the displacement. Durability can be maintained. In addition, the upper support layer formed using the upper support material made of No. 7 crushed stone or crushed sand contains almost no components or impurities that promote corrosion, such as chlorine ions, sulfate ions, moisture, soil, and organic matter. Corrosion prevention of the back surface of the metal bottom plate 3 applied to the upper surface is achieved. Further, the upper support layer using the upper support material made of No. 7 crushed stone or crushed sand protects the lower flexible film body without transferring the welding heat when constructing the bottom plate on the upper surface thereof. Does not burn or damage the body. Further, the upper support layer with many voids also has a role of absorbing and dispersing the heat of welding to prevent deterioration due to a high temperature in the vicinity of the weld.
Furthermore, the lower support layer using the lower support material formed by foaming synthetic resin is lightweight and durable, and homogenization and high void ratio, improved elasticity, weight reduction of the foundation, and the like can be achieved. Thus, when the weight of the lower support layer is reduced, the weight burden on the bottom base plate that supports the lower portion is reduced, and the strength of the support floor serving as the bottom base plate can be reduced. The structure is suitable for the foundation of a pool that is provided indoors or on a rooftop.
[0041]
In addition, a belt-like presser plate having a plurality of mounting holes provided on the peripheral portion of the peripheral portion is bent at the peripheral portion of the flexible film body and extended along the inner side wall surface. Since the plurality of mounting holes are inserted into the mounting member embedded in the inner wall surface and tightened by the tightening member, the side base plate is fixed in close contact with each other. Etc. are blocked from moving up and down. Also, it can freely expand and contract and move up and down depending on the flexible performance of the flexible membrane body, etc., and flexibly and repeatedly deform the bottom plate due to load fluctuations due to entering and exiting pool water, etc. Because it follows, it maintains durability and liquid tightness without tearing or aging.
[0042]
Further, the peripheral portion of the flexible film body is bent and extended along the side inner wall surface, raised vertically upward, extended to the upper surface of the side base plate and folded, and the bottom plate of the storage tank is placed thereon. Since it is placed and fixed, it is easy to fix the periphery of the flexible film body, the liquid tightness is improved, the upper and lower support layers are kept liquid tight, and moisture and the like are prevented from moving in the vertical direction. Also, it can freely expand and contract and move up and down depending on the flexible performance of the flexible membrane body, etc., and flexibly and repeatedly deform the bottom plate due to load fluctuations due to entering and exiting pool water, etc. Because it follows, it maintains durability and liquid tightness without tearing or aging.
[Brief description of the drawings]
FIG. 1 is a vertical cross-sectional explanatory view showing a case of a foundation of a swimming pool that stores water in an embodiment of a foundation of a storage tank according to the present invention.
FIG. 2 is an explanatory diagram showing an enlarged part of FIG. 1;
FIG. 3 shows another embodiment of the foundation of the storage tank according to the present invention. In the foundation of the swimming pool for storing water, a drainage port is provided on the upper part of the flexible membrane body that is provided with a natural gradient. It is perspective explanatory drawing which made a part the cross section which shows the case where it provided.
FIG. 4 is a perspective explanatory view, partly in section, showing the case of a swimming pool foundation for storing water as the foundation of a conventional storage tank.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pool 2 Pool water 3 Bottom plate 4 Side plate 5 Overflow groove 6 Pool deck 7 Side support material 8 Side base plate 9 Bottom base plate 10 Base 11 Lower support layer 12 Flexible film body 13 Upper support layer 14 Presser material 15 Mounting member 16 Drain groove 17 Drain port 21 Pool 22 Pool water 23 Bottom plate 24 Side plate 25 Overflow groove 26 Pool deck 27 Side support material 28 Side base plate 29 Bottom base plate 30 Support layer 31 Foundation

Claims (3)

The foundation for supporting the storage tank is the bottom horizontal plate-shaped bottom base plate, the side base plate surrounding the outer periphery of the bottom base plate, and the lower portion provided on the inner bottom base plate surrounded by the side base plate Contains a support layer, a waterproof flexible membrane body provided on the upper portion of the lower support layer and having a peripheral edge fixed to the inner wall surface of the side base plate, and a corrosive component provided on the flexible membrane body. The upper support layer is formed of an upper support material made of No. 7 crushed stone or crushed sand, and the lower support layer is formed by foaming synthetic resin. The foundation of the storage tank, characterized by comprising . The peripheral portion of the flexible film body is bent and extended along the side inner wall surface, and is raised vertically upward to form a band-shaped presser plate provided with a plurality of mounting holes. 2, wherein the plurality of mounting holes are inserted into a mounting member embedded in the inner wall surface and tightened by a tightening member to be fixed in close contact with the side base plate . The basics of the storage tank. The peripheral portion of the flexible membrane body is bent and extended along the side inner wall surface, raised vertically upward, extended to the upper surface of the side base plate and folded, and the bottom plate of the storage tank is mounted thereon. The storage tank foundation according to claim 1 , wherein the foundation is fixed .

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