JP2000302190A - Tank with diaphragm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tank with a diaphragm, whose structure is simple, for which site work for assembly or the like and maintenance work, etc., of the completed tank are also easy, and which is capable of economically storing a liquid having corrosive gas dissolved therein. SOLUTION: A tank for storing a liquid in which corrosive gas is dissolved has a diaphragm 9 formed in an air layer portion 7 located above the liquid 6 stored in the tank. The diaphragm 9 is transversely developed so as to laterally partition the air layer portion 7 and is provided in a catenary state in such a manner that the circumferential edge thereof is joined to a ring-like girder 8 fixedly provided on an inner face of a side wall 2 of the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank for storing a liquid in which a corrosive gas is dissolved.

[0002]

2. Description of the Related Art Steel or concrete tanks such as distribution reservoirs for storing liquids containing corrosive gas, such as tap water containing chlorine gas for sterilization,
Condensation water generated from the gas in the gas layer above the storage liquid adheres to the inner surface of the roof and the inner surface of the side wall, and the condensed water absorbs the corrosive gas released from the storage liquid, for example, chlorine gas to reduce the concentration. High hydrochloric acid causes damage to the steel or concrete roof and side walls, and the side walls and roof facing the air layer inside the tank above the highest level of the stored liquid are taken with severe anticorrosion measures. .

As an example of the prior art, an example of a cylindrical dome-shaped steel tank for storing tap water will be described in more detail with reference to FIG. A steel cylindrical side wall 22 is connected to the outer peripheral edge of the steel circular flat plate-shaped bottom wall and erected, and the upper end of the side wall 22 is formed of a shaped steel or the like and erected in an arch shape. It is constructed by providing a roof 23 consisting of a roof bone 24 and a steel sheet roof plate 25 stuck on the roof bone 24, and stores tap water 26 in which chlorine gas for sterilization of corrosive gas is dissolved. In the dome roof type steel cylindrical tank described above, the side wall 22a facing the gas layer portion 27 formed above the highest liquid level of the storage liquid 26 of the general dome roof type steel cylindrical tank is stored. Liquid 26 More corrosion resistant than other side walls below the highest level Built using a high corrosion-resistant steel sheet that has been,
Further, a roof plate 25a made of a highly corrosion-resistant steel plate is attached to the lower surface of the roof bone 24 facing the gas layer portion 27 of the roof 23, so that severe anticorrosion measures against corrosion caused by dew condensation water are taken.

[0004]

In a tank as shown in FIG. 3 for storing a liquid 26 in which corrosive gas is dissolved, a roof plate 25 that surpasses rain and wind and a roof plate 25a that prevents corrosion are provided.
The upper and lower two roof shingles 25, 25a are stretched over the roof bone 24, so that the roof bone 24 supporting the two roof shingle loads has to have a more robust structure.

In addition, the work of attaching the steel sheet shingle 25a to be stretched under the roof bone 24 must be carried out in a difficult work involving an upward work, and also requires a work technique, workability, safety and the like. Due to the problem described above, there is also an economical problem that an expensive tank is required because the thickness of the lower roof plate 25a using an expensive high corrosion-resistant steel plate cannot be so thin.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and the like, and has a simple structure, is easy to perform on-site work such as assembly and maintenance work of a completed tank, and is economically advantageous for corrosive gas. To provide a diaphragm tank capable of storing a liquid in which is dissolved.

[0007]

A diaphragm tank according to the present invention is a tank for storing a liquid in which a corrosive gas is dissolved, wherein the gas layer above and below the stored liquid in the tank is vertically moved. And a ring-shaped girder fixedly attached to the inner surface of the tank side wall to join a peripheral edge thereof to form a catenary-stretched diaphragm.

Further, the ring-shaped girder of the diaphragm tank is formed to have a width allowing passage.

Further, the diaphragm of the diaphragm tank is formed of an airtight and foldable sheet body of a synthetic resin film material or a cloth film material obtained by coating a fiber with a synthetic resin, or a metal airtight sheet body. Things.

[0010] Furthermore, an air vent communicating with the atmosphere is provided in each of the upper and lower gas layers separated by the diaphragm.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A diaphragm tank according to the present invention will be described with reference to FIGS. 1 and 2 which show an example of the embodiment. FIG. 1 is an explanatory longitudinal sectional view showing a partially simplified embodiment of a diaphragm tank according to the present invention, and FIG. 2 is a joint portion between a diaphragm and a ring-shaped girder of the diaphragm tank shown in FIG. It is sectional explanatory drawing which expands and shows a case. The illustrated embodiment is an example of a diaphragm tank in a dome roof type steel cylindrical tank that stores tap water in which chlorine gas for sterilizing corrosive gas is dissolved.

First, a bottom wall 1 of a tank is formed of a circular flat plate formed by arranging thin steel members on a base (not shown) and welding them together. Of a steel roof bone 4 formed of shaped steel or the like at the upper end of the side wall 2 and erected in an arch shape, and a steel plate roof plate 5 stuck on the roof bone 4. A dome-shaped roof 3 is provided. A ring-shaped girder is provided on the gas layer 7 formed above the highest liquid level of the tap water 6 to be stored so as to traverse the gas layer 7 so as to partition the gas layer 7 up and down and to be fixed to the inner surface of the side wall 2. 8 is joined to the periphery to form a diaphragm 9 stretched in a catenary shape.

The materials used for the bottom wall 1, the side wall 2, and the roof 3 will be described in more detail. The part directly in contact with the tap water 6 to be stored, that is, the side wall 2L below the highest liquid level of the storage liquid 6 and the bottom. The wall 1 is made of a corrosion-resistant stainless steel plate having corrosion resistance, for example, an austenitic stainless steel plate. The portion where the chlorine gas released from the storage tap water 6 comes into direct contact, that is, the maximum storage level of the tap water 6 A portion 2M of the side wall between the upper side and the lower side of the connection portion of the side wall 2 to which the diaphragm 9 is bonded is provided with a stainless steel plate of a high corrosion resistant steel having a higher corrosion resistance than the corrosion resistant steel, for example, a two-phase system of austenitic ferrite. Use stainless steel sheet or ferritic stainless steel sheet, etc., and place where chlorine gas released from storage tap water 6 does not directly contact, Using general weathering steel material above the sidewall 2U and part of the roof 3 from the junction of the side wall 2 of the film 9, with severe corrosion structure is provided, an economical construction as a whole tank.

It is to be noted that the bottom wall 1,
When the side walls 2 and the roof 3 are constructed, a tank having excellent functions such as aesthetics, durability, and maintenance-free can be constructed. For example, a tank using an inexpensive weather-resistant steel material or a concrete structure is used. The whole is constructed, anti-corrosion coating or anti-corrosion coating is applied to the inner surface of the tank using the above-mentioned corrosion-resistant steel, and the anti-corrosion with more excellent anti-corrosion property is applied to the inner surface of the tank using the above-mentioned high corrosion-resistant steel In the case of painting or applying a high anticorrosion coating, it can be constructed more economically and cheaply than the case tank of the above-mentioned material.

A diaphragm 9 is provided so as to extend transversely so as to partition the gas layer 7 up and down. The diaphragm 9 is formed by joining the ends of a sheet member having airtightness, toughness, and high corrosion resistance, for example, a thin steel plate such as the high corrosion resistance steel. Formable metal sheet, foldable synthetic resin film material made of synthetic resin material such as vinyl chloride resin, or cloth film coated with synthetic resin such as vinyl chloride resin on fibers such as polyester fiber or glass fiber A foldable sheet or the like is used.

When the diaphragm 9 made of a metal sheet is used, the diaphragm 9 becomes more durable.
When the diaphragm 9 formed of a sheet of a synthetic resin film material or a cloth film material obtained by coating a fiber with a synthetic resin is used, since it can be folded, it is compactly folded from a manufacturing plant to a tank construction site. The diaphragm 9 that can be folded and conveyed, the folded-in diaphragm 9 can be unfolded in the tank, lifted up, easily attached to the inner peripheral surface of the side wall 3 and connected, and the ease of handling greatly shortens the construction period required for construction. Can be shortened.

The structure of connecting the diaphragm 9 formed of the above-mentioned sheet body to the tank side wall 2 will be described in detail in the case of FIG. 2A. Reference numeral 80 denotes a ring-shaped member made of high corrosion-resistant steel and formed in an L-shaped cross section. The girder 8 is an example, in which one end of the L-shape is fixed to the inner peripheral surface of the tank side wall 2 and a hole for coupling the diaphragm 9 is provided on the other side of the L-shape. The coupling holes provided on the peripheral edge of the diaphragm 9 are aligned with each other.
If necessary, the perforated holding plate 8P is covered with a gasket or paste for hermetic connection, bolts are passed through the holes, and nuts are tightened.
And airtight, and stretched in catenary shape with catenary curve.

When the diaphragm 9 is stretched in the catenary shape of the catenary line in this manner, dew water generated from the gas in the lower gas layer 7L and adhered to the lower surface of the diaphragm 9 is transmitted through the lower surface of the diaphragm 9 to the center. The condensed water drops along the inner surface of the side wall 2 and the anticorrosion property of the inner surface of the tank side wall 2 increases.

As shown in FIG. 2B, the ring-shaped girder 8 is formed by bending a stainless steel plate or the like of the above-mentioned high corrosion-resistant steel which is not corroded by chlorine gas released from the tap water 6 for storage. If the ring-shaped girder 81 is formed in an L-shape and has an extension width 8E extending in the direction toward the center of the inside of the tank, the width of the ring-shaped girder 81 is such that a tank construction worker, a completed tank maintenance worker, and the like can pass through. , Its ring-shaped girder 8
1 can be used as a work scaffold to facilitate the construction work of a tank construction worker, and can be used as a passage for inspection work or the like, thereby facilitating maintenance work of a completed tank maintenance worker.

Further, as shown in FIG.
When the inclination angle of the tip bent portion of the ring-shaped girder 81, that is, the attachment surface 8F of the diaphragm 9, is formed in accordance with the inclination angle of the catenary diaphragm 9 to be joined to the periphery of the catenary-like diaphragm 9, the joint portion of the diaphragm 9 is formed. Since the discontinuous force does not act, the durable diaphragm 9 can be connected, and the periphery of the diaphragm 9 is drawn to form the ring-shaped girder 81.
The work at the time of joining to the can be easily performed.

The upper and lower gas layers 7L and 7U separated by the extension of the diaphragm 9 are placed in the atmosphere so that a load is not applied to the diaphragm 9 due to a pressure difference generated between the upper and lower gas layers 7L and 7U. An air vent 10 composed of an upper air vent 10U and a lower air vent 10L communicating with the air vent 10 is provided.

For the upper air vent 10U, a steel pipe having a bent end, for example, as shown in FIG. 1, is attached through the top of the tank roof 3 so as to enhance ventilation performance so that rainwater or the like does not fall. Formed by

The lower air vent 10L is provided, for example, with an air-tight opening as shown in FIG. 1 so that rainwater or the like does not fall into the lower air layer 7L under the diaphragm 9 so as to enhance ventilation performance. Attached through the side wall 2 of the tank as the upper part, or while not shown, the rear end side of the bent steel pipe is passed through the roof 3 of the tank, and the lower end is inserted so as to enhance the ventilation performance. The ring-shaped girder 81, which is the uppermost portion of the layer portion 7L, is formed by penetrating an extension width 8E extending inward of the tank. The lower air vent 10L of the former opening structure with a refrigerator has a simple structure and can be formed at low cost, and the lower air vent 10L of the structure penetrating the ring-shaped girder 81 is easy to maintain after completion.
In addition, a structure having more excellent ventilation performance is obtained.

A pipe 11 for a liquid level gauge, etc., which penetrates the tank roof 3 and reaches the lower gas layer 7 L partitioned by the diaphragm 9,
As shown in FIG. 1, the ring-shaped girder 81 is provided so as to penetrate an extension width 8 </ b> E extending inside the tank. If the pipe 11 for the liquid level gauge or the like reaching the lower gas layer part 7L is installed without penetrating the diaphragm 9 in this manner, the diaphragm 9 is not restricted or distorted by the connection of the pipe 11, so that The durability of the diaphragm 9 increases.

Although the illustrated embodiment is an example of a cylindrical tank made of dome-shaped steel for storing tap water 6, the diaphragm tank according to the present invention has a storage material other than dilute sulfuric acid. A tank for storing a liquid in which a corrosive gas is dissolved, or a tank with another roof shape such as a conical roof, or a tank with another side wall shape such as a rectangular side wall, and a component made of a concrete structure The present invention can also be applied to a tank or the like formed of another constituent material.

[0026]

According to the diaphragm tank of the present invention, a ring-shaped girder is provided in the gas layer above the liquid stored in the tank so as to be transversely developed so as to partition the gas layer vertically and to be fixed to the inner surface of the side wall of the tank. To form a diaphragm that is stretched in a catenary shape by connecting the perimeter to the condensate.Condensation water adhering to the lower surface of the diaphragm drops from the central part of the catenary-like diaphragm toward the storage liquid surface, so that the anticorrosive properties of the tank sidewall inner surface In addition, it is not necessary to form the roof bone to a more robust strength like the conventional two-panel tank, and the structure is simple, so that the liquid in which the corrosive gas is dissolved can be economically used. Can be stored.

Further, in the diaphragm tank in which the ring-shaped girder is formed to have a passable width, the ring-shaped girder can be used for a work scaffold, a passage for inspection work, etc., so that tank construction work can be facilitated. In addition, maintenance work of the tank can be easily performed.

A diaphragm tank having a diaphragm formed of an airtight and collapsible sheet member can greatly shorten the construction period because the diaphragm can be easily transported and mounted, and a metal airtight sheet member can be provided. The diaphragm tank having the diaphragm formed therein can be a tank having excellent durability.

The upper and lower gas layers separated by the diaphragm are provided with air vents communicating with the atmosphere.
Since there is no pressure difference between the upper and lower gas layers, the load due to the pressure difference is not applied to the diaphragm, and the durability of the diaphragm can be increased.

[0030]

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing a partially simplified embodiment of a diaphragm tank according to the present invention.

FIG. 2 is an enlarged cross-sectional explanatory view showing an example of a connection structure between a diaphragm and a ring-shaped girder of the diaphragm tank shown in FIG. 1, wherein (a) illustrates an example of an L-shaped ring-shaped girder; FIG. 3B is an explanatory diagram of a case of a ring-shaped girder formed to have a passable width.

FIG. 3 is a partial perspective explanatory view showing a conventional tank.

[Explanation of symbols]

1 Bottom wall 2,2L, 2M, 2U
Side wall 3 Roof 4 Roof bone 5 Roof 6 Storage liquid (tap water) 7, 7L, 7U Gas layer 8, 80, 81 Ring-shaped girder 8E Extension width 8F Mounting surface 9 Diaphragm 10, 10U, 10L
Air release 11 piping

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 21, 1999 (1999.4.2
1)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

Claims (4)

[Claims] 1. A tank for storing a liquid in which a corrosive gas is dissolved, wherein a gas layer above the stored liquid in the tank is provided.
A diaphragm tank characterized by forming a diaphragm extending in a catenary shape by connecting the periphery to a ring-shaped girder fixedly provided on the inner surface of the tank side wall so as to traverse the gas layer portion so as to partition the gas layer vertically. 2. The diaphragm tank according to claim 1, wherein the ring-shaped girder has a width allowing passage. 3. The air conditioner according to claim 1, wherein the diaphragm is formed of an airtight and foldable sheet body of a synthetic resin film material or a cloth film material obtained by coating fibers with a synthetic resin, or a metal airtight sheet body. The diaphragm tank according to claim 1 or 2, wherein: 4. The diaphragm tank according to claim 1, wherein the upper and lower gas layers separated by the diaphragm are provided with air vents communicating with the atmosphere.