JP2000302188A - Tank with flexible diaphragm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tank with a flexible diaphragm, which can achieve a highly corrosionproof function in a simple structure and is easily assembled, on which repair work is also easy, and which is capable of economically storing a liquid having corrosive gas dissolved therein. SOLUTION: A tank has a flexible diaphragm 8 provided in an air layer portion 7 located above a liquid 6 stored in the tank for storing a liquid in which corrosive gas is dissolved, and the flexible diaphragm 8 is transversely developed so as to laterally patition the air layer portion 7 and is formed in such a manner as to be kept in a loose state. The flexible diaphragm 8 is provided with parts 9P to be supported, which are supported on a tank roof 5, and the circumferential edge of the flexible diaphragm 8 is airtightly joined to 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 separated from the storage liquid absorbs the corrosive gas, for example, chlorine gas, and reduces 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. .

[0003] An example of the prior art of a dome-shaped steel cylindrical tank for storing a storage liquid of tap water will be described in more detail with reference to FIG. A steel cylindrical side wall 32 is joined to the outer peripheral edge of a circular flat bottom wall (not shown) and is erected, and is formed at the upper end of the side wall 32 with a shaped steel or the like and is arched. It is constructed by providing a roof 35 consisting of a steel roof frame 33 and a steel plate roof plate 34 stuck on the roof frame 33, and a storage liquid in which chlorine gas for sterilizing corrosive gas is dissolved ( In the case of a dome-roof-type steel cylindrical tank for storing the tap water (water) 36, the gas layer portion 37 and the surface formed above the highest liquid level of the stored liquid 36 of the above-mentioned general dome-roof-type steel cylindrical tank The side wall 32a is a storage liquid (tap water) 3
6 is constructed using a high corrosion-resistant steel plate having higher corrosion resistance than the other side wall materials below the highest liquid level, and a roof plate 34a made of a high corrosion-resistant steel plate is provided on the lower surface of the roof bone 33 facing the gas layer portion 37. Attachment has been made to prevent severe corrosion from dew condensation water.

[0004]

In a tank as shown in FIG. 6 for storing a storage liquid (tap water) in which corrosive gas is dissolved, a roof plate 34 that surpasses rain and wind and a roof plate 34a that prevents corrosion are provided. The upper and lower two steel plate roof plates 34, 34a are stretched over the roof frame 33, so that the roof frame 33 that supports the load of the two steel plate panels must have a more robust structure. Was.

In addition, the work of attaching the steel plate 34a to be stretched under the roof frame 33 involves many difficult operations to be performed in an upward direction. In addition, the work of welding the steel plate 34a to be stretched is also many. Therefore, there was also an internal problem of an economic problem such as a tank requiring a large construction cost.

Further, when damage such as corrosion occurs on the steel roof plate 34a stretched under the roof frame 33, the repair work involves many dangerous upward work in the upward direction, and the repair work is extensive. With many difficulties.

The present invention has been made to solve the above-mentioned problems and the like, and achieves a severe anticorrosion function with a simple structure, is easy to assemble, easy to repair, and economically reduces corrosive gas. An object of the present invention is to provide a flexible diaphragm tank capable of storing dissolved liquid.

[0008]

A flexible diaphragm tank according to the present invention traverses a gas layer above a stored liquid of a tank for storing a liquid in which a corrosive gas is dissolved so as to partition the gas layer vertically. A tank provided with a flexible diaphragm which is developed and slackened, wherein the flexible diaphragm has a supported portion provided on the flexible diaphragm supported by a roof of the tank, and a periphery of the flexible diaphragm is formed on a periphery of the tank. It is airtightly connected to the side wall.

Further, the flexible diaphragm of the flexible diaphragm tank is suspended and supported on a roof by a cord connected to a supported portion provided on the upper surface of the flexible diaphragm.

Further, the flexible diaphragm of the flexible diaphragm tank extends the periphery of the flexible diaphragm, which is airtightly connected to the side wall of the tank, below the highest liquid level of the stored liquid, so that the side wall is liquid-tight and airtight. It is what combines.

Further, the central portion of the flexible diaphragm of the flexible diaphragm tank is formed of a multilayer film in which gas is sealed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flexible diaphragm tank according to the present invention will be described with reference to the drawings of FIGS. FIG. 1 is a longitudinal sectional explanatory view showing a partially simplified embodiment of a flexible diaphragm tank according to the present invention, and FIG. 2 is a sectional view showing the periphery of the flexible diaphragm of the flexible diaphragm tank shown in FIG. FIG. 3 is an enlarged partial cross-sectional explanatory view showing an example of a structure of a connecting portion with a side wall, FIG. 3 is a vertical cross-sectional explanatory view showing a partly simplified construction process of the flexible diaphragm tank of FIG. 1, and FIG. FIG. 5 is a partial cross-sectional explanatory view showing another embodiment of the joint structure between the peripheral edge and the side wall of the flexible diaphragm. FIG. 5 shows another example of the flexible diaphragm having a central portion formed of a multilayer film body in which gas is sealed. It is a longitudinal section explanatory view showing a partly simplified embodiment example. The illustrated embodiment is an example of a flexible diaphragm tank in a dome-roof-type steel cylindrical tank for storing tap water stored in a storage liquid containing chlorine gas for sterilizing corrosive gas.

First, the bottom wall 1 of the tank is formed of a circular flat plate formed by arranging thin steel members and welding them together on a base (not shown). Side walls 2 are erected and connected to each other, and a steel roof bone 3 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 sheet roof plate 4 stuck on the roof bone 3 A dome-shaped roof 5 is provided. And the stored liquid (tap water) 6
Gas layer 7 formed above the highest liquid level of
Is provided with a flexible diaphragm 8 which is transversely developed and slackened so as to partition the upper and lower sides of the flexible diaphragm.

The material examples used for the bottom wall 1, the side wall 2, and the roof 5 will be described in detail. The part directly in contact with the storage liquid (tap water) 6 to be stored, that is, the highest liquid of the storage liquid (tap water) 6 A stainless steel plate of corrosion-resistant steel having corrosion resistance, for example, an austenitic stainless steel plate, is used for a portion of the side wall 2L and the bottom wall 1 below the surface, and chlorine gas separated and vaporized from the storage liquid (tap water) 6 comes in direct contact therewith. That is, the portion of the side wall 2M between the uppermost liquid level of the storage liquid (tap water) 6 and the lower side of the connecting portion of the side wall 2 to which the flexible diaphragm 8 is connected is more corrosion-resistant than corrosion-resistant steel. Use a stainless steel sheet of superior corrosion-resistant steel, such as an austenitic / ferritic duplex stainless steel sheet or a ferritic stainless steel sheet, and use a storage liquid (water (Water) 6 is not directly in contact with the vaporized chlorine gas, that is, the side wall 2U and the roof 5 above the joint between the side walls 2 of the flexible diaphragm 8, if a general weather-resistant steel material is used, An anticorrosion structure is provided, and the tank as a whole is economical.

By the way, as shown in FIG. 4, the flexible diaphragm after being air-tightly coupled to the side wall 2 so as to cover the inner surface of the side wall 2M with which the chlorine gas separated and vaporized from the storage liquid (tap water) 6 comes into direct contact. 8 around the storage liquid (tap water)
6 is extended to below the highest liquid level and is liquid-tightly and air-tightly fastened to the side wall 2L by a detachable fastening structure such as bonding or screwing. It is not necessary to use expensive high-corrosion-resistant steel, so that the entire tank has a more economical structure.

Further, the bottom wall 1 is formed by using the above materials.
When the side walls 2 and the roof 5 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 can be used. The entire tank is constructed, a corrosion-resistant coating or a corrosion-resistant coating is applied to the tank inner surface side of the portion (bottom wall 1, side wall 2L) using the corrosion-resistant steel, and the tank (portion 2M) using the high corrosion-resistant steel. When a high anti-corrosion coating or a high anti-corrosion coating with more excellent anti-corrosion properties is applied to the inner surface, the tank can be constructed more economically and cheaply than the above-mentioned material example tank.

The flexible diaphragm 8 is provided so as to be transversely developed so as to partition the gas layer 7 in the tank up and down and to be slackened downward.
Airtight, tough, and highly corrosion-resistant sheet material, for example, a sheet material made of a foldable cloth film material in which fibers such as polyester fiber and glass fiber are coated with a synthetic resin such as vinyl chloride resin, or a foldable synthetic resin A sheet member made of, for example, is used.

Since the flexible diaphragm 8 is formed of a sheet of cloth material formed by coating a fiber with a synthetic resin or a sheet of synthetic resin, the flexible diaphragm 8 is much lighter than a steel plate. The roof bone 3 can be constructed more economically because its robustness can be greatly reduced compared to the conventional tank with a two-sheet roofing structure made of steel plate, and it can be folded. The flexible diaphragm 8 that can be folded and transported compactly to the construction site, and is further deployed in the tank, lifted and mounted on the inner peripheral surface of the side wall 2 is also easy, and the handling is easy. The construction period required for construction can be significantly reduced.

Further, since the flexible diaphragm 8 is provided with a slack, even if a pressure difference occurs between the gas layers 7 and 7 above and below the flexible diaphragm 8, it is possible to respond by changing the deformation of the slack. It is difficult to be damaged because it is possible. Furthermore, even if the stored liquid (tap water) 6 is sloshed under the influence of an earthquake or the like and collides with the flexible diaphragm 8, the amount of slack deformation is changed to cope with it. Is possible, so that the structure is hardly damaged.

The support of the flexible diaphragm 8 formed of the sheet member on the roof 5 will be described in more detail. First, the flexible diaphragm 8 carried into the tank construction site is developed on the bottom wall 1 in the tank. (Not shown), the supported part 9 including the peripheral supported part 9P provided on the upper surface of the flexible diaphragm 8 and the cable 10 are connected, and the other side of the cable 10 connected to the supported part 9 is As shown in FIG. 3, the flexible diaphragm is engaged with the roof 5 such as the roof bone 3 and the cable 10 engaged with the roof 5 is towed by a manpower or a crane or a winch or the like, not shown, to operate the towing machine. 8 is lifted, and the pulled ropes 10 are fixedly engaged with the roof 5 to allow the flexible diaphragm 8 to be suspended and supported by the roof 5 with slack.

The peripheral supported portion 9P is a supported portion 9 provided in the vicinity of the peripheral edge of the flexible diaphragm 8 slightly closer to the center of the tank than the peripheral edge of the flexible diaphragm 8 connected to the side wall 2 and supported by the peripheral portion 9P. Although not shown in detail, the portion 9 is formed by, for example, a ring-shaped tab or the like firmly fixed at both ends of the strip to the upper surface of the flexible diaphragm 8 by sewing, welding, bonding, or a combination thereof. , A rope 10 made of, for example, a string or a stainless steel wire, a synthetic fiber rope, or the like.
Are formed to be strong so that the flexible diaphragm 8 can be lifted. In addition, the number of installations, arrangement positions, and the like are determined in consideration of strength, workability, and the like.

The fastening engagement between the roof 5 and the cable 10 is
1 and 3, the engaging member 11 is fixed to the engaging member 11 such as a metal annular hook or hook-shaped hook 11F, or a pulley 11P. 5, the rope 10 is guided between the roof 5 directly above the supported portion 9 and the opening 5H provided at the center of the roof 5, for example. Pulleys 11P, 11P, 11P ...
And hook-shaped hooks 11F, 11 attached in the opening 5H.
F, 11F... Are provided.
Cable 1 that is guided by pulley 11P and extends from opening 5H
0 is pulled by a towing machine (not shown) to lift the flexible diaphragm 8, and in a state where the flexible diaphragm 8 is lifted, the rope 10 is engaged with the hook-shaped hook 11 </ b> F to stop the rope 10 on the roof 5. I'm wearing

When the rope 10 is fixedly engaged with the roof 5 by using the engaging member 11 composed of the pulley 11P and the hook 11F as described above, the unfolded state in which wrinkles are less generated. The flexible diaphragm 8 can be easily lifted with
In addition, the work of fixing the cable 10 to the roof 5 can be performed very easily.

However, the supported portion 9 of the flexible diaphragm 8
The structure for fastening and engaging the roof with the roof 5 is the same as that shown in FIG.
As shown in the fixing engagement structure example of P ', the flexible diaphragm 8
The peripheral supported portion 9P ′ of the flexible diaphragm 8 is directly pressed against the roof 5 without forming the above-described tab or the like on the peripheral supported portion 9P ′ provided at the peripheral support portion 9P ′. May be employed in such a manner that it is directly engaged and fixed to the roof 5 by a detachable connection such as a screw connection using a holding plate or the like. It is easy to increase the number of fastening points, and by increasing the number of fastening points, the shape of the flexible diaphragm 8 that is provided to be slackened downward can be easily adjusted, so that it is easy to prevent the locally occurring deformation.

Then, as shown in FIG. 2, the flexible diaphragm 8
Of the supported portions 9 provided in the above, at least a peripheral supported portion 9P provided in the vicinity of the peripheral edge of the flexible diaphragm 8 is supported by the roof 5 and is in a hanging state as indicated by a two-dot chain line. 8 is pressed against a ring girder 12 fixed to the inner peripheral surface of the side wall 2 of the tank.
The hole for connection provided on the periphery of the flexible diaphragm 8 is aligned with the hole for connection provided on the flexible diaphragm 8. 12P, the bolt is passed through the hole, and is detachably connected to the tank by a detachable connection such as a screw connection tightened with a nut, as shown by a solid line, and is airtightly connected to the side wall 2 of the tank.

The flexible diaphragm 8 is supported on the roof 5 by the supported portions 9 provided on the flexible diaphragm 8 as described above.
Is formed into a structure that joins the periphery of the tank to the side wall 2 of the tank.
Since the weight of the flexible diaphragm 8 is dispersedly supported by the roof 5, the entire weight of the flexible diaphragm 8 does not act on the joint between the flexible diaphragm 8 and the side wall 2, so that the flexible diaphragm 8 and the side wall 2 The joining operation can be performed very easily, and the sealing property of the joining portion between the flexible diaphragm 8 and the side wall 2 can be secured for a long time because a large load is not applied.
Better airtight coupling is possible.

The connecting structure between the flexible diaphragm 8 and the side wall 2 is formed by using a detachable connection such as a screw connection in a state where the flexible diaphragm 8 is suspended and supported on the roof 5 by the cords 10. When the flexible diaphragm 8 is damaged, the detachable connection between the flexible diaphragm 8 and the side wall 2 is released.
Loosen the cable 10 and drop the flexible diaphragm 8 down onto the bottom wall 1 in the tank to remove the new flexible diaphragm 8 from the cable 1.
0, which is lifted up and hung on the roof 5 to be supported, and the flexible diaphragm 8 and the side wall 2 are detachably connected to each other so that the new flexible diaphragm 8 can be replaced and repaired very safely and easily. Can be.

As shown in FIG. 5, the flexible diaphragm 8
Is formed by the multilayer film body 8W in which the gas 8G is sealed, the rigidity of the central portion in which the gas 8G is sealed is increased by the sealing pressure of the gas 8G. Since it becomes easy, the installation work of the flexible diaphragm 8 and the removal work at the time of replacement can be easily performed. Further, when the gas 8G to be filled in the multilayer film body 8W is filled with a gas 8G lighter than air such as helium and buoyancy is given to the flexible diaphragm 8, the load applied to the supported portion 9 of the flexible diaphragm 8 is reduced. Therefore, the durability of the flexible diaphragm 8 can be increased. Although the embodiment of the flexible diaphragm 8 shown in FIG. 5 has a medium bulging disk shape, the shape of which is not shown, but the tubular multi-layer film body 8W is attached to the outer peripheral portion. The shape of the flexible diaphragm on the bottom wall 1 described above can be formed into a shape provided in an annular shape, a shape provided radially from the central portion to the outer peripheral portion, or a shape obtained by combining those shapes. The deployment work can be easily performed, which is useful for shortening the construction period of the deployment work and preventing the flexible diaphragm from being damaged during the deployment work.

Although not shown in the drawings, the flexible diaphragm is provided so that a load is not applied to the flexible diaphragm due to a pressure difference generated between the upper and lower gas layers separated by the provision of the flexible diaphragm in the tank. If an air vent communicating with the atmosphere is provided in each of the upper and lower gas layers separated by the stretching, no extra load is applied to the supported portion of the flexible diaphragm and the joint between the flexible diaphragm and the side wall. In addition, the durability of the flexible diaphragm can be further increased.

Further, the illustrated embodiment is an example of a cylindrical tank made of dome-shaped steel for storing the storage liquid of tap water. In the flexible diaphragm tank according to the present invention, the storage material is diluted sulfuric acid. A tank storing a liquid in which other corrosive gas is dissolved, or a tank having another roof shape such as a conical roof, or a tank having another side wall shape such as a rectangular side wall, and components Can also be applied to tanks and the like made of other components such as concrete structures.

[0031]

In the flexible diaphragm tank according to the present invention, the flexible diaphragm provided so as to be transversely developed and slackened so as to partition the gas layer above the stored liquid up and down is supported by the flexible diaphragm provided on the flexible diaphragm. The load applied to the flexible diaphragm can be accommodated by the deformation of the slack, because the periphery of the flexible diaphragm is airtightly connected to the side wall of the tank, and the weight of the flexible diaphragm is reduced to the roof. Since the flexible diaphragm is supported in a dispersed manner, it is easy to join the flexible diaphragm to the side wall, and the durability of the sealing function of the joint can be increased. Therefore,
A severe anticorrosion function can be achieved with a simple structure, and a liquid in which corrosive gas is dissolved can be stored economically.

Further, the flexible diaphragm tank which suspends and supports the flexible diaphragm on the roof with a cord connected to the supported portion provided on the upper surface of the flexible diaphragm can be easily replaced with a new flexible diaphragm. Therefore, even if the flexible diaphragm is damaged, it can be easily replaced and repaired.

Further, in the flexible diaphragm tank, the periphery of the flexible diaphragm airtightly connected to the side wall of the tank extends to below the maximum liquid level of the stored liquid and is connected to the side wall in a liquid-tight and airtight manner. It is not necessary to use expensive high-corrosion-resistant steel as an anti-corrosion component, so that a more economical tank can be provided.

Further, the flexible diaphragm tank, which forms the central portion of the flexible diaphragm with a multilayer film body filled with gas,
Since the rigidity of the central portion in which the gas is sealed is increased, the work of lifting and lowering is extremely easy, so that the installation work and the removal work at the time of replacement can be easily performed.

[0035]

[Brief description of the drawings]

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

FIG. 2 is an enlarged partial cross-sectional view showing an example of a structure of a joint between a peripheral edge and a side wall of the flexible diaphragm of the flexible diaphragm tank shown in FIG. 1;

FIG. 3 is an explanatory longitudinal sectional view showing a partially simplified construction process of the flexible diaphragm tank shown in FIG. 1;

FIG. 4 is a partial cross-sectional explanatory view showing another embodiment of the structure of the joint between the peripheral edge and the side wall of the flexible diaphragm.

FIG. 5 is an explanatory longitudinal sectional view showing a partially simplified example of another embodiment of a flexible diaphragm having a central portion formed of a multilayer film in which gas is sealed.

FIG. 6 is a partial perspective view illustrating a conventional tank.

[Explanation of symbols]

1 Bottom wall 2, 2L, 2M, 2
U side wall 3 roof bone 4 roof plate 5 roof 5H roof opening 6 stored liquid (tap water) 7 gas layer 8 flexible diaphragm 8W multi-layered film body 8G gas 9 supported part 9P, 9P 'peripheral supported part 10 rope Article 11, 11P, 11F Engagement tool 12 Ring girder

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kotaro Tanaka 6-5-1 Higashi-Kojiya, Ota-ku, Tokyo F-term in Ishii Iron Works Co., Ltd. (Reference) 3E070 AA03 AB09 BA10 BB10 DA01 DA10 DA18 RA01 RA16

Claims (4)

[Claims] A tank provided with a flexible diaphragm which is transversely developed and slackened in a gas layer above a stored liquid in a tank for storing a liquid in which a corrosive gas is dissolved, so as to partition the gas layer vertically. The flexible diaphragm is characterized in that a supported portion provided on the flexible diaphragm is supported on a roof of a tank, and a periphery of the flexible diaphragm is airtightly connected to a side wall of the tank. tank. 2. The flexible diaphragm according to claim 1, wherein a supported portion is provided on an upper surface of the flexible diaphragm, and the flexible diaphragm is suspended and supported on a roof by a cord connected to the supported portion. Flexible diaphragm tank. 3. The flexible diaphragm is characterized in that the periphery of the flexible diaphragm airtightly connected to the side wall of the tank extends below the maximum liquid level of the stored liquid and is liquid-tightly and airtightly connected to the side wall. The flexible diaphragm tank according to claim 1 or 2, wherein: 4. The flexible diaphragm according to claim 1, wherein a central portion of the flexible diaphragm is formed of a multilayer film in which gas is sealed.
Or the flexible diaphragm tank according to 3.