KR200302277Y1 - Cylindrical storage tank using arc-type unit - Google Patents

Abstract

Cylindrical storage tanks are manufactured by combining a plurality of arc-shaped units in a pre-fabricated state, the base 12; A cylindrical unit (30) lying on the base; And a cover 16 installed on an upper portion of the upper annular frame, wherein the cylindrical unit is manufactured by combining a plurality of arc-shaped units 40, 50, and 80 with each other, and the arc-shaped unit is in a left-right direction. Arc-shaped steel sheets 42, 52, and 82 constituting an arc of a predetermined angle; A lower arc-shaped frame (44, 54, 84) installed on the outer surface of the lower end of the arc-shaped steel sheet; And upper arc-shaped frames 46, 56, and 86 installed on the outer surface of the upper end of the arc-shaped steel sheet.

Description

Cylindrical storage tank using arc-type unit {CYLINDRICAL STORAGE TANK USING ARC-TYPE UNIT}

The present invention relates to a cylindrical storage tank, and more particularly to a cylindrical storage tank manufactured by combining a plurality of arc-shaped units in a pre-fabricated state.

In general, a storage tank for storing a liquid, such as a water tank, is formed in a cylindrical shape and is installed outdoors or on the roof of a building. In the related art, in order to manufacture such a storage tank, a method of forcibly bending the upper and lower portions of the steel sheet through a rolling process and the like, forcing the bent steel sheet into a circular shape, is used.

However, this method is a cause of corrosion due to scratches on the surface in the process of bending the steel sheet, and also in the process of bending the bent steel sheet in a circle, the bent portion is loosened or bent, causing the cylindrical unit to be replaced with other cylindrical units. There were difficulties in welding when combined with the base or the cover. In addition, there is a problem that the bent portion forms a gap with the adjacent structure and the internal fluid leaks.

In particular, such a conventional method has a hassle that has to be transported to the site after being manufactured in advance in the factory because a separate auxiliary equipment is required in the process of bending or bending the steel sheet. For this reason, bulky cylindrical storage tanks have been a difficult task to transport to high-rise rooftops or mountainous areas, and large equipment such as cargo cranes must be used.

In addition, even in the case of manufacturing a small storage tank that requires a high degree of precision, the conventional method of necessarily causing bending in the bent portion is very inadequate. In addition, due to the above-described bending, in particular, the stainless steel sheet is easily broken due to fatigue accumulated in the bent portion, and in order to prevent this, a very thick steel sheet is generally used. This increases the material cost and makes the processing difficult.

The present invention is devised to overcome the above-mentioned disadvantages of the prior art, and an object of the present invention is to fabricate a plurality of arc-shaped units in advance, and then combine the arc-shaped units with each other so that no scratches or bends are formed on the surface of the steel sheet. It is to provide a cylindrical storage tank that does not occur.

The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the detailed description of the present invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

1 is a perspective view showing an overall appearance of a cylindrical storage device according to the present invention.

FIG. 2 is a perspective view of a cylindrical unit forming part of the cylindrical storage tank of FIG. 1; FIG.

3 shows the process of installing an additional arcuate unit on the cylindrical unit of FIG.

4 is a diagram illustrating an example of a process of manufacturing an arc-shaped unit.

FIG. 5 shows an example of an arcuate unit constituting the cylindrical unit of FIG. 2. FIG.

FIG. 6 shows another example of an arcuate unit constituting the cylindrical unit of FIG. 2. FIG.

7 is a view showing another example of the arc-shaped unit constituting the cylindrical uni of FIG. 2. FIG. 8 is a cross-sectional view showing a coupling state of a ladder and a base installed in the cylindrical storage device of FIG.

9 is an exemplary view showing the internal structure of a cylindrical storage device according to the present invention.

<Explanation of symbols for important parts of the drawing>

10. Cylindrical storage tank 12. Base 14. Piping

16.cover 18.ladder 20.opening and closing door

24. Handrail 30. Cylindrical unit 40, 50.60. Arc unit

42,52,62..Arcular steel plate 44,54,64.The lower arc-shaped frame

46,56,66..Top arc frame 48,52a, 52b..Extension

62a, 62b.vertical frame 80.outlet 82.overflow outlet 86.inlet 88.valve 90.buoy 92bypass

Cylindrical storage tank using the arc-shaped unit according to the present invention to achieve the above object is a base; A cylindrical unit overlying the base; And a cover installed on an upper portion of the upper annular frame, wherein the cylindrical unit is manufactured by combining a plurality of arc-shaped units with each other, and the arc-shaped unit comprises: an arc-shaped steel sheet forming an arc of a predetermined angle in a left and right direction; A lower arc-shaped frame installed on an outer surface of the lower end of the arc-shaped steel sheet; And an upper arc-shaped frame is installed on the outer surface of the upper end of the arc-shaped steel sheet.

Preferably, the arc-shaped steel sheet of the arc-shaped unit has one side extending from the upper and lower arc-shaped frames, and the extension portion is attached to the inner circumferential surface of the arc-shaped steel sheet of the adjacent arc-shaped unit.

As another example, the arc-shaped steel sheet of the arc-shaped unit is formed on both sides extending from the upper and lower arc-shaped frame, both sides of the arc-shaped steel sheet is bent toward the upper and lower arc-shaped frame, the arc-shaped The units may be configured to be coupled to each other by the bent extensions.

As another example, the arc-shaped steel sheet of the arc-shaped unit is formed on both sides extending from the upper and lower arc-shaped frame, the both sides of the arc-shaped steel sheet is coupled to the vertical frame having a flat surface on the outside, respectively, The arc-shaped units may be configured to be coupled to each other by the vertical frame.

Or, a vertical frame having a flat surface outwardly between the upper and lower arc-shaped frame is coupled to the side end of the arc-shaped steel plate of the arc-shaped unit, the arc-shaped unit is coupled to each other by the vertical frame It is also possible.

Such cylindrical units may be combined in a plurality of vertical units.

In addition, a handrail for guiding an operator is formed on an upper surface of the cover, and the base is preferably provided with a ladder connected to the handrail.

In this case, an inlet pipe and an outlet pipe for inflow and outflow of fluid are installed in the storage tank, and a buoy for detecting a specific water level and a valve operated by the buoy are installed at an outlet side of the inlet pipe. It is also preferred that a bypass pipe is installed between the pipe and the outlet pipe to sense fluid at a particular level so that when the valve is locked the fluid moves directly from the inlet pipe to the outlet pipe.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors will properly interpret the concept of terms in order to best explain their own design. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical ideas of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 shows the overall appearance of a cylindrical storage tank 10 according to the present invention. Referring to FIG. 1, the cylindrical storage tank 10 of the present invention is provided with one or more cylindrical units 30 on the base 12, which is the basis of the entire structure, and is approximately at the top of the cylindrical unit 30. The conical cover 16 is provided.

The base 12 is generally manufactured by pouring concrete at the work site. The base 12 may be installed so that a plurality of pipes 14 including inlet pipes and outlet pipes communicate with the interior of the storage tank. The pipe 14 does not necessarily penetrate the base 12, but may be formed to pass through the side of the cylindrical unit 12 in some cases.

The lid 16 has an approximate cone shape that slopes down from the center toward the edge. Due to the conical shape, dust or rainwater accumulated on the upper portion of the cover 16 naturally flows down. In addition, the predetermined opening of the cover 16 is provided with an opening and closing door 20 for the operator to enter and exit the storage tank 10.

Ladder 18 is installed on the side of the storage tank 10 adjacent to the opening and closing door 20 so that the operator can move up and down. Ladder 18 is installed to be firmly fixed to the base 12, the upper end is adjacent to the opening and closing door 20 to facilitate the operator's convenience. In addition, a handrail 24 for guiding an operator is installed around the cover 16. The handrail 24 serves as a handrail for a worker to hold by hand, and is coupled to the cover 16 by a plurality of pillars 28.

At this time, the ladder 18 and the handrail 24 may be installed separately from each other, but is preferably configured to be connected to each other through the connection portion 26. That is, the ladder 18 and the handrail 24 are integrally formed so that the operator can use the ladder 18 and the handrail 24 at the same time naturally. At this time, the connection portion 26 connecting the ladder 18 and the handrail 24 may use an L-shaped pipe, or may join the ladder 18 and the handrail 24 by soldering or the like. Do.

In addition, the ladder 18 should be free of shaking for the safety of the operator. At this time, the upper end of the ladder 18 maintains firmness by coupling with the handrail 24, the lower end of the ladder 18 is firmly coupled to the base 12. An example of installing the ladder 18 to the base 12 is shown in FIG. 8, and referring to FIG. 8, a support plate 18a is installed at the lower end of the ladder 18. The support plate 18a is firmly coupled to the upper surface of the base 12, and an insertion hole into which the lower end of the ladder 18 is inserted is formed therein. In addition, in the state where the ladder 18 is inserted into the insertion hole of the support plate 18a, the cap 18b is covered by the lower end of the ladder 18. As shown in FIG. Cap 18b is preferably tightly fixed to the bottom of the ladder 18, preferably made of the same material as the ladder. Steel or stainless steel may be used as the material of the cap 18b. In addition, the support plate 18a is firmly fixed to the base 12 by the fastening member 18c, and the fastening member 18c may be a bolt or an anchor.

Referring back to FIG. 1, a vent pipe 22 is installed at a central portion of the cover 16 so as to communicate with the inside of the storage tank 10. The vent pipe 22 serves to discharge the gas generated from the liquid stored in the storage tank 10 to the outside. The vent pipe 22 is bent so that the upper end is directed downward to prevent foreign substances from flowing in.

2 shows a cylindrical unit 30 of the storage tank 10 according to the present invention. 2, this cylindrical unit 30 consists of a plurality of arcuate units. The arc-shaped unit forms an arc of an angle, and in the drawing, eight arc-shaped units are shown combined for one cylindrical unit 30.

Such a cylindrical unit 30 can be stacked in plurality. 3 illustrates, as an example, the process of stacking arc-shaped units one by one in order to stack additional cylindrical units on one completed cylindrical unit 30. At this time, in the process of stacking cylindrical units, the arc-shaped units of each layer are preferably stacked alternately with the arc-shaped units of adjacent layers. That is, as shown in FIG. 3, the arcuate units on the upper layer are stacked to span the two arcuate units on the lower layer.

4 shows a process of manufacturing such an arc-shaped unit. Referring to FIG. 4, the arcuate unit 40 is manufactured by joining the upper and lower frames 44 and 46 to the arcuate steel sheet 42 by welding or the like. Of course, when the side frame is additionally installed in addition to the upper and lower frames 44 and 46 in the arc-shaped unit 40, the side frame is also coupled to the arc-shaped unit by welding or the like.

5 to 8 show various examples of the arc-shaped unit constituting the cylindrical unit of FIG. 2.

First, the arc-shaped unit 40 shown in FIG. 5 will be described. The arc-shaped unit 40 includes an arc-shaped steel sheet 42 having a predetermined length in the vertical direction and forming an arc of a predetermined angle in the left and right directions. The arc-shaped steel sheet 42 is made of a material having appropriate strength and being weldable. Preferably, the arc-shaped steel sheet 42 is made of steel or stainless steel, most preferably a double stainless steel sheet.

The arc-shaped steel sheet 42 is provided with upper and lower arc-shaped frames 46 and 44. The lower arc-shaped frame 44 is installed on the outer side of the lower end of the arc-shaped steel plate 42, and the upper arc-shaped frame 46 is installed on the outer side of the upper end of the arc-shaped steel plate 42. The upper and lower arc-shaped frames 46 and 44 have the same length as each other, and are shown to be made of 'a' angles in the drawings. However, the shape of the upper and lower arc-shaped frame 46, 44 is not necessarily limited to this, it can be made of an angle or square pipe of the '' 'shape, of course.

At this time, in the present embodiment, the arc-shaped steel sheet 42 is formed with an extension portion 48 so that one side portion extends from the upper and lower arc-shaped frames 46 and 44. Extension 48 is indicated by hatching in the figure. This extension part 48 is a part which overlaps with the inner peripheral surface of the adjacent arc-shaped steel plate, when it joins several arc-shaped steel plate 42 together. That is, the outer surface of the extension part 48 is sealed by welding or the like in the state where it overlaps with the inner peripheral surface of the adjacent arc-shaped steel plate.

When the above-described circular arc unit 40 is continuously coupled, the cylindrical unit 30 shown in FIG. 2 is completed.

6 shows another example of an arcuate unit used to fabricate the cylindrical unit 30 in the present invention.

The arcuate unit 50 according to the present embodiment is similar to the arcuate unit 40 of FIG. 5 in that it has an arcuate steel plate 52 and upper and lower arcuate frames 56 and 54. However, in the arcuate unit 50 of this embodiment, both side portions of the arcuate steel plate 52 are formed to extend outward from the upper and lower arcuate frames 56 and 54, and the extension portions 52a and 52b on both sides. Is different in that it is formed. In addition, these extensions 52a and 52b are bent toward the upper and lower arcuate frames 56 and 54 as shown to form an outwardly flat surface. The extensions 52a and 52b are preferably coupled to the side ends of the upper and lower arcuate frames 56 and 54 by welding or the like.

Extensions 52a, 52b having an outwardly flat surface are brought into contact with each other with extensions of adjacent arcuate units when joining a plurality of arcuate units 50. At this time, each extension portion is joined to the sealing surface to be completely sealed by welding or the like. When the arc unit 50 is continuously coupled in this manner, the cylindrical unit 30 shown in FIG. 2 is completed. The bent extensions 52a and 52b described above in the cylindrical unit 30 thus completed serve to support the cylindrical unit 30 in the vertical direction.

Figure 7 shows another example of the arc-shaped unit constituting the cylindrical unit 30 according to the present invention. The arc-shaped unit 60 according to the present embodiment is an arc-shaped steel plate 62 and the upper and lower arc-shaped Similar to the arcuate units 40, 50 of FIGS. 5 and 6 in that they have frames 66, 64. However, the arcuate unit 60 of the present embodiment does not extend outwardly from the upper and lower arcuate frames 66 and 64, and the pair of vertical arcuate steel plates 62 is arranged on both sides of the arcuate steel plate 62. The difference is that the frames 62a and 62b are provided. That is, the vertical frames 62a and 62b are coupled in a fitting manner between the upper and lower arcuate frames 66 and 64, and each frame is approximately square. In addition, the vertical frames 62a and 62b and the arcuate frames 66 and 64 are joined so that the edges of each other are engaged, with the end portions being partially removed. In this case, the vertical frames 62a and 62b and the arc-shaped frames 66 and 64 have a stable structure supported structurally with respect to each other. In the drawing, the vertical frames 62a and 62b have a '-' shape. Although illustrated as being an angle of, the shape of the vertical frames 62a and 62b is not necessarily limited thereto, and angles of the 'c' shape or the 'ㅁ' shape may also be used. The vertical frame 62a may also be used. 62b) has an outwardly flat surface as shown. The flat outer surfaces of the vertical frames 62a and 62b abut against each other with the outer surfaces of adjacent arcuate units when engaging a plurality of arcuate units 60. At this time, the outer surface of each vertical frame is joined to be completely sealed by welding or the like. When the arc unit 60 is continuously coupled in this manner, the cylindrical unit 30 shown in FIG. 2 is completed. In the cylindrical unit 30 completed as described above, the vertical frames 62a and 62b serve to support the cylindrical unit 30 in the vertical direction.

Next, Figure 9 shows the internal structure of the cylindrical storage tank according to the present invention. 9, the cylindrical storage device of the present invention includes a plurality of pipes for the inflow and outflow of fluid therein. Referring to this in more detail with reference to the drawings, the center tube 80 is installed in the inner center of the storage tank 10 first. The central tube 80 extends to the outside through the base 12, and extends in the vertical direction from the inner center of the storage tank 10. The center tube 80 is extended to the cover 16 via the intake portion 84 to be described later, by this structure the center tube 80 serves to structurally support the storage tank of the present invention. .

The overflow outlet pipe 82 is formed at a predetermined height above the center pipe 80. The installation position of the overflow outlet pipe 82 is determined according to the flow rate limit of the liquid contained in the storage tank 10. The overflow outlet pipe 82 is connected to the outside through the center pipe 80, when the liquid flows in more than the limit of the storage tank 10 to automatically discharge the excess amount to the outside.

An intake portion 84 is installed at an upper portion of the central tube 80, and a gas exhaust pipe 22 is connected to an upper end of the intake portion 84. The intake unit 84 is formed with a gas permeation space for sucking the gas to the side, to suck the gas outflow from the liquid contained in the storage tank (10). In addition, the gas exhaust vent 22 installed at the upper end of the intake portion 84 communicates with the outside through the center of the cover 16 to discharge the gas sucked into the intake portion 84 to the outside.

The storage tank 10 is also provided with an inlet pipe 86 for introducing liquid into the storage tank 10. Inlet pipe 86 is installed in a vertical direction at a specific position in the storage tank 10, the upper end is extended to a position slightly higher than the water surface of the storage in consideration of the storage limit of the storage tank 10. In addition, the inlet pipe 86 is bent so that the end is directed downward, it is preferable to prevent the flow of the incoming fluid to the upper side.

A valve 88 is provided at the end of the inflow pipe 86, and a buoy 90 linked with the valve 88 is connected to the valve 88. The buoy 90 is moved by buoyancy when the water level in the storage tank 10 becomes higher than a specific value, and is operated to close the valve 88 by the buoy 90 moving.

At this time, a bypass pipe 92 is installed between the inlet pipe 86 and the outlet pipe 80. The bypass pipe 92 extends to the outlet pipe 80 in a state extending to a position higher than the outlet of the inlet pipe 86. In addition, the bypass pipe 92 preferably communicates with the outlet pipe 80 at a position lower than the overflow outlet pipe 82. Due to the structure of the bypass tube 92, when the water level is lower than the buoy 90, all the fluid flowing in is introduced into the storage tank 10 through the outlet of the inlet tube 86. However, when the water level becomes high enough to move the buoy 90, the valve 88 is closed by the buoy 90, so that the fluid introduced through the inlet pipe 86 moves to the bypass pipe 92 and outflows. Out of the tube (80).

In general, a storage tank for storing natural water is sterilized by putting a certain concentration of chlorine in the natural water stored in the tank. If there is no bypass pipe 92, the surplus fluid is introduced into the storage tank 10 and then discharged to the outside through the overflow outlet pipe 82, and the discharged fluid contains chlorine, so that the storage tank ( 10) Natural water gradually decreases the chlorine concentration. However, when the bypass pipe 92 is installed, the surplus fluid does not flow into the storage tank 10, but exits through the outlet pipe 80 as it is, so that chlorine remains in the natural water in the storage tank 10. It remains.

In addition, the natural water generally contains a small amount of impurities, the bypass pipe 92 also provides an effect of reducing the impurities accumulated in the storage tank 10 by flowing out an unnecessary amount of natural water as it is.

Next, an internal ladder 94 for workers is installed inside the storage tank 10, and the internal ladder 94 is preferably positioned at an upper end thereof adjacent to the opening / closing door 20 of the cover 16. At this time, the inlet pipe 86 described above may be installed in connection with the internal ladder 94. That is, the inlet pipe 86 may be configured to function as part of the ladder 94 by replacing one of the columns of the internal ladder 94 with the inflow pipe 86.

The storage tank 10 is also provided with one or more drain pipes. For example, in the figure, the drain pipe 96 connected to the outside through the base 12 from the bottom of the storage tank 10 and from the bottom of the storage tank 10 to the outside through the base 12 from a position slightly above. The drain pipe 98 is shown to be connected. At this time, the former drain pipe 96 is for discharging all the fluid in the storage tank 10 to the outside, generally can be used for the purpose of cleaning the inside of the storage tank (10). On the other hand, the latter drain pipe 98 may be used to drain the fluid contained in the storage tank 10 for other purposes or to adjust the fluid level.

Next, look at the method of manufacturing a cylindrical storage tank according to the present invention configured as described above. Here, it is illustrated that one cylindrical unit 30 is installed on the base 12 for convenience of description.

Referring to the case of manufacturing the cylindrical unit 30 of the present invention in the field as an example, first, the base 12 is placed on the installation surface on which the storage tank 10 is to be installed. At this time, the base 12 may be manufactured on-site by pouring and curing concrete directly. In addition, although not shown, the base 12 may be manufactured with a plurality of pipes embedded therein.

Next, the bottom plate 13, which is the bottom surface of the storage tank 10, is fixed on the base 12. The lower plate 13 should have a diameter equal to or larger than the outer circumferential surface of the cylindrical unit 30.

On the lower plate 13, one arc unit 40, 50, 60 is first installed. The arcuate units 40, 50, and 60 have a lower surface sealed with the upper surface of the lower plate by welding or the like. Thereafter, additional arcuate units are placed next to the arcuate units 40, 50 and 60 described above. Two adjacent arcuate units are joined together and sealed together, and further arcuate units are also sealed by bottom plate and welding. In this way, a predetermined number of arcuate units are installed to complete the cylindrical unit 30.

At this time, the method of coupling each arc unit 40, 50, 60 unit to each other should proceed according to the above-described embodiments, a separate description will be omitted.

Thus, in the process of installing the cylindrical unit 30, it is also possible to perform the installation of various pipes and components necessary therein in advance. In particular, since the present invention makes a cylindrical unit by a plurality of arc-shaped units, it is possible to manufacture the cylindrical unit even if the work of the internal space is performed in advance. Of course, it is also possible to install the internal parts after completion of the cylindrical unit.

After installing both the cylindrical unit and the internal parts, the cover 16 is installed, and then the cylindrical storage tank is completed by installing external parts such as a ladder or a railing.

On the other hand, by loading the cylindrical unit 30 in a multi-layer it can be configured a larger storage tank. That is, by stacking up and down a plurality of cylindrical units 30 manufactured in the same manner except for the lower plate 13 and the base 12, it is possible to make one large-capacity storage tank communicating with each other inside. When using a plurality of cylindrical units 30, each cylindrical unit 30 is coupled to the upper surface of the upper arc-shaped frame (46, 56, 66) and the lower surface of the lower arc-shaped frame (44, 54, 64). The storage tank 10 shown in Figure 1 shows a total of three cylindrical units are loaded.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Various modifications and variations can be made within the equivalent scope of the utility model registration claims to be described.

Cylindrical storage tank according to the present invention is to produce a cylindrical unit by combining the respective arc-shaped unit in a state in which a plurality of arc-shaped unit is made in advance, scratches or bending caused by bending in the state of bending a conventional steel sheet It is possible to prevent the occurrence of the original, solved the problem of shortening the product life due to corrosion caused by scratches and at the same time solved the disadvantages of difficult to maintain the tightness of the bonding of each frame by bending.

In addition, since the cylindrical storage tank of the present invention is simply assembled without forming each frame separately, each frame can be transported in a disassembled state and assembled in the field, making it difficult to transport equipment such as a rooftop or a mountainous area of a high-rise building. There is an advantage that can be easily installed in the place.

In addition, since the airtightness of the container is ensured because the bending does not occur during the frame joining process, it is not only suitable for small storage tanks requiring high precision, but also suitable for manufacturing large storage tanks because of easy transportation and installation of parts.

In addition, when the cylindrical unit is made of an arc-shaped unit, since the operator can fully work even inside the cylindrical unit, it is possible to install the internal components at the same time as or before the production of the cylindrical unit, thereby increasing the work efficiency. There is an advantage.

In addition, the cylindrical storage tank of the present invention, as well as the ladder for the operator is installed adjacent to the lid, the outer ladder installed on the side of the storage tank and the handrail installed on the cover is integrally connected to each other, which is structurally very durable. In addition, there is an advantage that the operator can use very conveniently.

In addition, the cylindrical storage tank of the present invention by installing a valve and a buoy in the inlet pipe, by connecting the inlet pipe and the outlet pipe to the bypass pipe, when the water level in the storage tank exceeds a certain level, the fluid flowing into the outlet pipe as it is In this case, the chlorine concentration in the storage tank can be prevented from being unnecessarily diluted, and the accumulation of impurities can be reduced.

Claims (8)

Base 12; A cylindrical unit (30) lying on the base; And A cover 16 installed on an upper portion of the upper annular frame, The cylindrical unit is manufactured by combining a plurality of arc-shaped units 40, 50, 60, The arc unit, Arc-shaped steel sheets 42, 52, and 62 constituting an arc of a predetermined angle in the left and right directions; A lower arc-shaped frame (44, 54, 64) installed on the outer side of the lower end of the arc-shaped steel sheet; And Cylindrical storage tank using an arc-shaped unit, characterized in that the upper arc-shaped frame (46, 56, 66) is installed on the outer surface of the upper end of the arc-shaped steel sheet. The method of claim 1, The arc-shaped steel sheet 42 of the arc-shaped unit 40 is formed with one side extending from the upper and lower arc-shaped frame 46, 44, Cylindrical storage tank using the arc-shaped unit, characterized in that the extension portion 48 is attached to the inner peripheral surface of the arc-shaped steel sheet of the adjacent arc-shaped unit. The method of claim 1, The arc-shaped steel sheet 52 of the arc-shaped unit 50 is formed on both sides extending from the upper and lower arc-shaped frame (56, 54), Both extension portions 52a and 52b of the arc-shaped steel sheet are bent toward the upper and lower arc-shaped frames, The arc-shaped unit is a cylindrical storage tank using the arc-shaped unit, characterized in that coupled to each other by the bent extension. The method of claim 1, The arc-shaped steel plate 62 of the arc-shaped unit 60 is provided with vertical frames 62a and 62b engaged with the upper and lower arc-shaped frames 66 and 64 at both sides thereof. The vertical frames 62a and 62b each have a flat surface outward, The circular frame (66, 64) and the vertical frame (62a, 62b) is a cylindrical storage tank using an arc-shaped unit, characterized in that the edges of each other is engaged by removing a part of the abutment. delete The method according to any one of claims 1 to 4, Cylindrical storage tank using an arc-shaped unit, characterized in that the plurality of cylindrical unit 30 is loaded and coupled in the vertical direction. The method of claim 6, The upper surface of the cover is formed with a handrail 24 for guiding the operator, Cylindrical storage tank, characterized in that the base is provided with a ladder (18) connected to the handrail. The method of claim 6, An inlet pipe 86 and an outlet pipe 80 for inflow and outflow of fluid are installed in the storage tank. At the outlet side of the inlet pipe, a buoy 90 for detecting a specific water level and a valve 88 operated by the buoy are installed. Between the inlet pipe and the outlet pipe, the buoy detects a specific water level and when the valve is locked, a bypass pipe 92 for moving the fluid directly from the inlet pipe to the outlet pipe is installed. Cylindrical storage tank.