JP4936156B2 - Concrete storage tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete storage tank for storing a liquid.
[0002]
[Prior art]
In the storage tank in which the inner wall surface of the bottom wall and the side wall of the concrete storage tank is lined with a steel plate seal layer, and the inner wall surface of the concrete roof above it is covered with a film body, Japanese Patent Laid-Open No. 6-136989 discloses a “concrete roof”.
[0003]
Further, a storage tank using a corrosion-resistant steel plate as a side wall material of the storage tank and a coating lining provided with a film body under the roof includes, for example, the invention of Japanese Patent Application Laid-Open No. 2000-302188 “flexible diaphragm tank” by the present applicant. . The present invention uses a steel plate having corrosion resistance on the side wall that comes into contact with the storage liquid in which the corrosive gas is dissolved, and the corrosive gas separated and vaporized from the storage liquid is separated by a film body, thereby increasing the height of the upper part of the side wall and the roof. A general steel plate is used without using a corrosion-resistant steel plate.
[0004]
[Problems to be solved by the invention]
In the invention of Japanese Patent Laid-Open No. 6-136989 “Concrete roof” introduced above, the inner wall surface of the bottom wall and the side wall made of concrete is previously lined with a steel plate, and then the inner wall surface of the roof is covered with a flexible film body. However, it is necessary to use a steel plate having high corrosion resistance against the corrosive gas contained in the gas phase as the side wall steel plate in contact with the uppermost water surface and the fluctuating water surface of the stored liquid.
[0005]
Further, the invention of the above-described conventional Japanese Patent Laid-Open No. 2000-302188 “flexible diaphragm tank” is suitable for covering the inner wall surface above the side wall of the steel plate, but the steel plate is applied to the inner wall surface below the side wall of the concrete storage tank. It was not the structure which united the lower edge part of the film body which coat | covers this steel plate and coat | covers a concrete side wall upper inner wall surface to this steel plate.
In other words, when lining steel plates and membranes on the inner wall of a concrete storage tank by post-installation, liquid-tightness is required in the range of the liquid phase at the bottom of the storage tank, i.e., the area immersed in the stored liquid. A structure in which a steel plate and a film body are liquid-tightly coupled to the wall surface has been desired.
[0006]
If metal parts such as nuts are exposed at the joints, there is a risk of damage due to corrosion, or the corrosive substances may be mixed into the stored liquid, and the sealing material will deteriorate, resulting in liquid tightness. I was worried about being damaged. Furthermore, there is a possibility that impurities contained in the stored liquid adhere and accumulate during use of the storage tank.
[0007]
In addition, there is a concern that the fixed part deteriorates and is damaged due to pressure fluctuations that change due to the storage liquid being put in and out during use of the storage tank due to the protrusion of the metal part at the joint location, or during the work. .
[0008]
The object of the present invention has been made in view of the problems of the prior art as described above, and is a concrete product in which the inner wall surface of a concrete storage tank is lining formed functionally and economically by combining a film body and a steel plate. A storage tank is provided.
[0009]
[Means for Solving the Problems]
The concrete storage tank according to the invention of claim 1 is formed by lining the inner wall surface of a concrete storage tank composed of a lithographic bottom wall, a cylindrical side wall, and a roof covering the top wall in combination with a film body and a steel plate. It is a concrete storage tank, and the inner wall surface of the side wall extending from the inner wall surface of the roof and the gas phase part of the storage tank to the liquid phase part below the highest liquid level of the storage liquid is a film body having corrosion resistance against the stored liquid and corrosive gas. The inner wall surface of the lower side wall and the inner wall surface of the bottom wall lined with this film body are lined with a corrosion-resistant steel stainless steel plate having corrosion resistance against the stored liquid, and the lower peripheral edge of the film body is the highest liquid level. more sidewall positions lower, superposed on the steel plate upper surface, while the film body the lower end of the film body that is extended downward, the anchor bolt projecting on the upper surface of the steel plate upper end, via a sealing material, Rate, washers, and attached in a liquid-tight with a nut, the upper portion that binds to the liquid-tight, and coated by reversing the film body lower portion obtained by the extension, such as by welding or bonding at junctions A bag-like covering film that is liquid-tightly fixed is provided .
[0011]
Further, the concrete storage tank according to the invention of claim 2 is a soft material having elasticity and adhesion on top of the anchor bolt, washer and nut of the concrete storage tank of claim 1 where the liquid-tight connection is made. A cap for film protection using a member made of a material is provided .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a concrete storage tank according to the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 shows an embodiment in which the inner wall surface of a concrete storage tank is lined by combining a film body and a steel plate. FIG. 2 shows an enlargement of the joint location between the steel plate and the film body of FIG. 1, and FIG. 3 shows an embodiment of the joint location.
[0014]
FIG. 1 is a bottomed cylindrical concrete storage tank, in which 1 is a dome-shaped roof, 2 is a cylindrical side wall, and 3 is a lithographic bottom wall. 4 is a storage liquid such as tap water, and 5 is a gas phase above the storage liquid 4.
A horizontal line 6 indicated by a solid line indicates the highest liquid level of the stored liquid 4, and a horizontal line 7 indicated by a one-dot chain line indicates an operation lowest liquid level. The water level difference H between the highest liquid level 6 and the operation lowest liquid level 7 is a liquid fluctuation part during normal water supply.
The inner wall surface of the concrete storage tank is formed by lining by combining the film body 11 and the steel plate 12, and the upper part of the roof inner wall surface 8 and the side inner wall surface 9 of the roof 1 is closely attached by the flexible film body 11. The bottom inner wall surface 9 of the side wall 2 and the bottom inner wall surface 10 of the bottom wall 3 are lined in close contact with a corrosion-resistant steel plate 12.
[0015]
As shown in FIGS. 1 and 2, the steel plate 12 is lined from the lower end of the side inner wall surface 9 to a position above the operation lowest liquid level 7 of the storage liquid 4 and from the highest liquid level 6 to a water level indicated by a broken line below. The film body 11 has an immersion liquid range L from the highest liquid level 6 downward to the water level indicated by the broken line by adapting the continuous film body 11A along the inner wall surface 9 from the roof inner wall surface 8 to the wall surface shape. It extends only to the position where it is lowered, and to the position above the operation minimum liquid level 7. And the lower-end peripheral part of the film body lower end part 11a of this film body 11A is overlap | superposed on the upper surface of the upper end part 12a of the said steel plate 12, and is fixed liquid-tightly by the fixing | fixed part 13. FIG.
[0016]
Thus, the film body having corrosion resistance to the stored liquid 4 and the corrosive gas in the range from the immersion liquid range L above the lowest operating liquid level 7 to the side inner wall surface 9 of the gas phase 5 above the highest liquid level 6. Since the lining is performed using 11A, the steel plate 12 such as an expensive high corrosion-resistant steel stainless steel plate such as SUS329J4L is not used, so that the lining structure is excellent in economic efficiency.
[0017]
The lining steel plate 12 uses a corrosion-resistant steel stainless steel plate having corrosion resistance to the stored liquid 4, such as SUS304, for the bottom inner wall surface 10 and the side inner wall surface 9 below the lowest operation liquid surface 7. For the portion of the side inner wall surface 9 above the liquid level 7, SUS304 of the above corrosion resistant steel stainless steel plate or SUS316 having further excellent corrosion resistance is used.
[0018]
The membrane body 11 lining the inner wall surface 8 of the roof uses a flexible membrane material that has corrosion resistance against the corrosive gas contained in the gas phase 5 above the inside of the storage tank, and is strong and excellent in airtightness. Further, the film body 11A corresponding to the portion immersed in the storage liquid 4 and the immersion liquid range L uses a flexible film material that is durable and strong in liquid-tightness with respect to the storage liquid 4. To do. The sheet body made of this film material is, for example, a sheet body formed of a synthetic resin material such as a polyolefin resin, an ethylene vinyl acetate resin, a polyvinyl chloride resin, or a fiber such as polyester fiber or glass fiber. A sheet body such as a cloth film material coated with a synthetic resin such as a resin is used.
[0019]
As described above, the roof inner wall surface 8 and the side wall inner wall surface 9 are lined with the film bodies 11, 11 A up to a position above the operation minimum liquid surface 7, and the side inner wall surface 9 is above the operation minimum liquid surface 7 and the bottom wall 3. The bottom inner wall surface 10 is lined with a steel plate 12, and the film body 11 </ b> A and the steel plate 12 are liquid-tightly coupled with the fixing portion 13, so that the roof inner wall surface 6 may be exposed to a corrosive gas contained in the gas phase 5. As a result, it is possible to prevent damage and deterioration of the concrete roof inner wall surface 6 and improve durability, and the range from the range immersed in the storage liquid 4 of the side inner wall surface 9 to the upper gas phase 5 Since the inner wall surface 9 of the side wall is protected by the film body 11A without being immersed in the storage liquid 4, damage deterioration of the side inner wall surface 9 made of concrete can be prevented and the strength and water shielding can be improved.
Moreover, since the fixed part 13 of the film body 11A and the steel plate 12 is bonded at the liquid phase part of the storage liquid 4, it is not exposed to a corrosive gas for a long period of time, so that it does not easily deteriorate and has a service life. improves.
[0020]
Based on FIG. 2, the example of embodiment of the fixing | fixed part 13 of the steel plate 12 to line and the film body 11A is demonstrated in detail.
An anchor bolt 14 is planted on the side inner wall surface 8 of the side wall 2, and the upper end portion 12 a of the steel plate 12 is fixed to the anchor bolt 14, and the lower end portion 11 a of the film body 11 A is overlapped and joined to the upper surface. An elastic liquid-tight sealing material 15 is provided in a predetermined range around the anchor bolt 14 projecting from the upper surface of the upper end 12a of the steel plate, the lower end 11a of the film body is inserted, and the strip plate 16 is inserted. Then, the washer 17 is inserted and tightened with the nut 18 so as to be liquid-tightly coupled.
[0021]
For the members such as the anchor bolt 14, the plate 16, the washer 17, and the nut 18, a corrosion-resistant and strong material, for example, a metal material such as a stainless steel material or an alloy material, a synthetic resin material, or the like is used. The sealing material 15 is made of a material having elasticity, corrosion resistance, liquid tightness, etc., for example, a synthetic rubber material such as silicon rubber or chloroprene rubber.
[0022]
FIG. 3 is an example of an embodiment of a connecting portion, in which (a) is provided with a bag-like covering film 19 on the upper part of a fixing portion 13 connected using an anchor bolt 14, and (b) The case where a cap 21 for protecting the membrane is provided above the washer and nut at the tip of the bolt of the fixing portion 13 is shown.
The lower end portion 11a of the film body is connected to the anchor bolt 14 protruding from the upper surface of the upper end portion 12a of the steel plate with a plate, washer, and nut through a sealing material in a state where the lower portion is extended. The film 19 inverts the extended film body lower end portion 11 a to cover the upper part of the joint, and is fixed in a liquid-tight manner by welding or adhesion at the joint portion 20. The covering film 19 is made of a flexible film material that is excellent in liquid tightness, strong, corrosion resistant, and durable.
Thus, by providing the bag-like cover film 19, metal members such as bolt tips, plates, washers, and nuts are not exposed to the liquid phase, so that the metal members are not corroded and are expensive and have high corrosion resistance. Since it is not necessary to use a member and an inexpensive member can be used, the economy is improved.
And since it is possible to follow the fluid pressure fluctuation due to the storage liquid in and out by the elasticity of the bag-seal-like covering film 19 and the sealing material and maintain the close contact state, the fixing portion 13 is not deteriorated or damaged. , More durable and safer.
[0023]
The cap 21 for protecting the film uses a member made of a soft material having elasticity, adhesion and the like, for example, a synthetic rubber material. Thus, by providing the cap 21 for protecting the membrane, protrusions such as nuts at the tip of the bolt do not directly contact the covering membrane 19 and are not rubbed or damaged, and the pressure is prevented against fluctuations in the hydraulic pressure. Since the pressure can be absorbed and relieved, the durability is further improved.
[0024]
【Effect of the invention】
As is apparent from the above description, the concrete storage tank according to the invention of claim 1 is formed by coating the inner wall surface of a concrete storage tank composed of a lithographic bottom wall, a cylindrical side wall, and a roof covering the top wall. A concrete storage tank formed by combining a body and a steel plate, and the inner wall surface of the side wall extending from the gas phase part of the roof and the liquid phase part below the highest liquid level of the storage liquid to the storage liquid and corrosive gas The inner wall surface of the lower side wall and the inner wall surface of the bottom wall lined with the film body are lined with a corrosion-resistant steel stainless steel plate having corrosion resistance against the stored liquid. lower peripheral edge of at sidewall position lower than the highest liquid surface, superimposed on the steel plate upper surface, the film body the lower end of the film body in a state of being extended downwards, anchor bolts protruding upper surface of the steel plate upper end To, via a sealing material, plate, washer, and attached in a liquid-tight with a nut, the upper portion that binds to the liquid-tight, and coated by reversing the film body lower portion obtained by the extension, joining Since a bag-like cover film that is liquid-tightly fixed by welding or adhesion is provided at the part , metal members such as plates, anchor bolts, and nuts are not exposed to the stored liquid and are not exposed to the liquid. Therefore, corrosion or deterioration does not occur, the stored liquid is not contaminated, and the liquid tightness of the fixed part is improved by the bag binding cover film. Since the adhesive state can be maintained by following the elasticity of the covering film and the sealing material, the durability and safety can be further improved without the fixing part being deteriorated or damaged. And as said metal member, since it is not necessary to use an expensive highly corrosion-resistant material and an inexpensive member can be used, it becomes an economical fixed part. Furthermore, since the cover is covered with a bag-like covering film, the fixing part does not protrude and the surface becomes smooth, so that objects are not caught and deposits are not attached. It becomes a concrete storage tank.
[0025]
Since the film body is lightweight and flexible, it adheres along the shape of the wall under pressure, so that it is easy to handle and work, and it has airtightness and liquid-tightness, resulting in long-term durability. Further, the steel sheet covers and protects the surface of the concrete wall with a rigid strength, and long-term corrosion resistance and durability can be obtained.
And since it was coated with a film body having corrosion resistance up to the lowermost liquid level of the side inner wall surface, it becomes a lining structure excellent in economic efficiency without using an expensive high corrosion-resistant steel sheet, and the flexible film body has a wall shape Since it can be easily and easily installed, it is possible to coat the side inner wall surface with better workability.
[0026]
Further, portions which bind to the liquid-tight is, around a predetermined range of the anchor bolt projecting on the steel plate on the end upper surface, a liquid-tight sealing member having elasticity is provided, the membrane body lower end to the upper Inserted and band plate-like plate is inserted, and the plate and washer and nut are liquid-tightly connected, so it can be attached to the inner side wall with good workability, and even if it is subject to fluctuations in hydraulic pressure, the sealing part Since the liquid tightness is maintained and the elastic follow-up is performed, a concrete storage tank having a lining structure having a joint portion excellent in liquid tightness and durability can be obtained.
[0028]
Further, the concrete storage tank according to the invention of claim 2 is a soft material having elasticity and adhesion on top of the anchor bolt, washer and nut of the concrete storage tank of claim 1 where the liquid-tight connection is made. Since a cap for film protection using a member made of material is provided ,
The membrane does not rub against the projections such as the nuts at the tip of the anchor bolt, and is not damaged by rubbing. Since it is possible to absorb and relieve the pressing force against fluctuations in hydraulic pressure without causing damage, a concrete storage tank with a lining structure having a joint portion with higher durability can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional explanatory view showing an embodiment of a concrete storage tank according to the present invention.
FIG. 2 is an enlarged explanatory view of a fixing portion shown in FIG.
3 (a) is an embodiment in which a bag binding cover film is provided on the upper part of the joint shown in FIG. 2, and FIG. 3 (b) is an embodiment in which a cap for protecting the film is provided on the upper part of the joint. is there.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roof 2 Side wall 3 Bottom wall 4 Storage liquid 5 Gas phase 6 Maximum liquid level 7 Operation lowest liquid level 8 Roof inner wall surface 9 Side inner wall surface 10 Bottom inner wall surface 11, 11A Film body 11a Film body lower end part 12 Steel plate 12a Steel plate upper end part 13 Fixing part 14 Anchor bolt 15 Sealing material 16 Plate 17 Washer 18 Nut 19 Cover film 20 Joining part 21 Cap H Liquid fluctuation part L Immersion range

Claims (2)

A concrete storage tank in which an inner wall surface of a concrete storage tank composed of a lithographic bottom wall, a cylindrical side wall, and a roof covering the flat wall is formed by lining a combination of a film body and a steel plate, the inner wall surface of the roof and the storage tank The inner wall surface of the side wall extending from the gas phase part to the liquid phase part below the highest liquid level of the storage liquid is lined with a film body having corrosion resistance against the storage liquid and corrosive gas, and the lower side wall lined with this film body The inner wall surface and the inner wall surface of the bottom wall are lined with a corrosion-resistant steel stainless steel plate having corrosion resistance against the stored liquid, and the lower peripheral edge of the film body is overlaid on the upper surface of the steel plate at the side wall position below the highest liquid surface. combined, in the state the film body the lower end of the film body that is extended downward, the anchor bolt projecting on the upper surface of the steel plate upper end, via a sealing material, plate, liquid-tight using washers and nuts Bound, the upper portion that binds to the liquid-tight, and coated by reversing the film body lower portion obtained by the extension, provided Fukurotoji shaped Kutsugaemaku for securing in a liquid-tight, such as by welding or bonding at junctions A concrete storage tank characterized by that. Anchor bolt locations to bind to the liquid-tight, the top of the washer and the nut, elasticity, according to claim 1, wherein the providing a cap for membrane protection using a member composed of a soft material having adhesion Concrete storage tank.

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