KR200294335Y1 - Cylinder type storage tank - Google Patents

Abstract

The present invention can provide more stable structural performance by stacking cylindrical units having a cylindrical shape that is bent in the transverse direction and having a flange portion bent in a cross-sectional shape at the top and bottom ends in multiple stages. The plurality of bending grooves formed in the circumference of the to provide a cylindrical storage tank that is excellent in thermal deformation performance and smooth the internal rotation rate of water.

Cylindrical storage tank of the present invention is a cylindrical unit (100, 100 ', 100 ", 200, 300) is a casing 50 and the bottom plate 11 is sealed in a multi-stacked unit assembly, cylindrical unit (100) Flange portions (110, 110 ", 111, 111 ', 111" of the letter' C 'cross-section formed integrally on the top and bottom of the 100, 100 ", 200, 300); A heat insulating material 38 seated by the edge walls 110a and 111a of the flange portions 110, 110 ", 111, 111 ', and 111"; Thin plates 39, 39a, 39b, 39c screwed to the rim walls 110a, 111a to bring the heat insulating material 38 into close contact with the cylindrical units 100, 100 ′, 100 ″, 200, 300.

Description

Cylindrical Storage Tank {CYLINDER TYPE STORAGE TANK}

The present invention relates to a cylindrical storage tank, in particular, stainless steel material can be used semi-permanently in the storage of liquids such as water, oil, etc., the 'c' cross-section flange is formed integrally bent at the upper and lower ends A cylindrical storage tank providing a cylindrical structure in which modular cylindrical units are stacked in multiple stages.

In general, the storage tank is made of various materials depending on the size and use of the storage medium, and its shape and size also vary. Commercial buildings such as apartments are equipped with water tanks for stocking water or heavy water. These tanks have a large storage capacity for use by many people, and most of them are made of concrete or steel sheets for construction economy. Also forms a cube. In contrast, water tanks for agricultural water storage are generally circular.

On the other hand, since water tanks must consider economics with their use, they have a small size and have a FRP (Fiber Reinforced Plastics) material with a life span of 7 to 8 years, or a sheet molding compound (SMC) material that can be used for 10 years. It has a stainless material which can be used semi-permanently.

In particular, the cylindrical storage tank is excellent in structural rigidity, and the flow of the water stored by the cylindrical structure is rotated, so that many people study the storage tank having a cylindrical structure due to the advantages such as long retention time of water and chlorine Efforts and prototype development are attempted.

As shown in FIG. 1, the cylindrical stainless steel water tank according to the prior art is disclosed in Korean Patent Laid-Open Publication No. 49248 in 2001, and a connecting portion 1a having a plurality of fastening holes at its edge is bent outward. A plurality of arc-shaped stainless panels 1 formed; Installed on the upper and lower portions of the arc-shaped stainless panel (1), respectively, to form a conical top and bottom surface, a plurality of fan-shaped stainless panel formed by connecting the connection portion (2a) having a plurality of fastening holes at the edges (2); A plurality of packing members 3 interposed between the plurality of arc-shaped stainless panels 1 and the connecting portions 1a and 2a of the fan-shaped stainless panel 2; A plurality of reinforcing members 4 which are interposed on both sides of the connecting portions 1a and 2a of the arc-shaped stainless panel 1 and the fan-shaped stainless panel 2, respectively, and have a “L” shaped cross-sectional shape formed on one side thereof. ) By fastening a plurality of bolts and nuts, they are joined together to form a cylindrical body. This prior art cylindrical stainless steel water tank is fixed to both ends of the air vent (5) installed at the top, the drain pipe (not shown) installed at the bottom, and the inner surface of the fan-shaped stainless panel (2) disposed at the top and bottom A plurality of vertical reinforcing bars 6 for supporting the water tank in a state, an inlet 7, an outlet 8 and an entrance 9 are provided.

However, the cylindrical stainless steel water tank according to the prior art, after manufacturing the stainless panel having the bent portion at the edge in different shapes, and then bolts to form a number of bolt holes for fastening bolts and nuts, resulting in an increase in manufacturing cost, Because of the assembly by hand, the mass production is almost impossible.

In addition, the conventional cylindrical stainless steel water tank is relatively expensive because it is installed through the complex bolt assembly between the assembly of a large number of parts, but apart from the cost is inevitable, using expensive materials such as stainless, The installation time is long and requires a lot of work force, so that the price of the product is very expensive and very uneconomical.

From the viewpoint of productivity and economy, the cylindrical stainless steel water tank of the prior art involves inconvenient and inefficient assembling work, and does not consider the fatigue and safety of the worker performing the water tank assembling work at high altitude. , Problems such as corrosion of the packing member.

In addition, since the cylindrical stainless steel water tank of the prior art is assembled, a reinforcing member for reinforcing the panel is necessarily required, so that the assembly work is very complicated.

In addition, the prior art cylindrical stainless steel water tank does not have any protection against thermal deformation when installed outdoors, and thus does not secure thermal stability, and if any slight distortion occurs, the stored water immediately There is a problem that can be leaked to the outside.

In addition, the cylindrical stainless steel water tank of the prior art has a thermal insulation performance is reduced due to the absence of the fixing means for the insulation during thermal insulation / insulation construction, or even in the case of a water tank with some insulation heat insulation performance due to the gap formed between the insulation and the panel This has the disadvantage of being very low and lacking a finish.

An object of the present invention is to provide a more stable structural performance by stacking modular cylindrical units having a cylindrical shape bent in the circumferential direction and having a flange portion bent in the cross-sectional shape of the upper and lower ends 'c' shape, In addition, the present invention provides a cylindrical storage tank capable of excellent thermal deformation resistance and smooth internal rotation rate of water by a plurality of bending grooves formed in the circumference of the cylindrical unit.

1 is a perspective view cut out a predetermined portion to explain the configuration of a cylindrical stainless steel water tank according to the prior art,

Figure 2 is a perspective view cut out a predetermined portion to explain the configuration of a cylindrical storage tank according to an embodiment of the present invention,

3a to 3c are perspective views for explaining a manufacturing method of the first cylindrical unit,

4 to 6 are cross-sectional views for explaining a method for manufacturing a cylindrical storage tank using the first cylindrical units,

FIG. 7 is a front view for explaining a method of constructing a heat insulating material in the first cylindrical units of the multi-stage shown in FIG. 6;

8 is an enlarged cross-sectional view for explaining a method of finishing the heat insulating material shown in FIG.

9 is a perspective view for explaining a second cylindrical unit of the cylindrical storage tank of the present invention,

10 is a perspective view for explaining a third cylindrical unit of the cylindrical storage tank of the present invention,

11 is a perspective view for explaining a completed state of the cylindrical storage tank of the present invention.

12 is a perspective view for explaining a fourth cylindrical unit of the cylindrical storage tank of the present invention.

<Description of the symbols for the main parts of the drawings>

11: bottom plate

38: heat insulation

39, 39a, 39b, 39c: sheet

50: cover

53: outer ladder

60: prop shaft

61: internal ladder

100, 100 ', 100 ", 200, 300: Cylindrical Unit

110, 110 ", 111, 111 ', 111": flange

110a, 111a: border wall

112, 112 ": Cylinder

113, 114, 115, 116, 117: bending part

161, 162, 163, 164: welding part

An object of the present invention as described above is a cylindrical storage tank in which a cover and a bottom plate are sealed in a unit assembly in which cylindrical units are stacked in multiple stages, and a 'c' cross-sectional shape formed integrally with the upper and lower portions of the cylindrical units. A flange portion; A heat insulating material seated by an edge wall of the flange portion; It is achieved by a cylindrical storage tank, characterized in that it comprises thin plates screwed to the rim wall to bring the insulation into close contact with the cylindrical units.

In addition, according to the present invention, the flange portions of the 'c' cross section are each welded welded to the bent portion of the inner and outer sides where the bending force is applied so as to increase the adhesion of the cylindrical units stacked in multiple stages It is preferable.

In addition, according to the present invention, the flange portion of the cross-section '' 'is formed with a bolt hole for the road surface installation, it is preferable that the reference hole is formed to increase the work efficiency by matching the coupling direction between the cylindrical units. .

In addition, according to the present invention, it is preferable that the cylindrical unit has a plurality of bent grooves which protrude outwardly or inwardly by integrally bending the circumference to attenuate the load on the welded portion by contraction and expansion due to external temperature change. Do.

In addition, according to the present invention, it is preferable that the cylindrical unit has a plurality of inclined bent grooves in order to facilitate the flow of the water filled therein and help the water and the chlorine contact.

In addition, according to the present invention, it is preferable that the bottom plate is formed with a plurality of bolt holes to be fixed to the installation road surface at predetermined intervals.

In addition, according to the present invention, it is preferable that the outer plate is formed in the thin plate to prevent the appearance deformation due to thermal deformation.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

In the drawings, Figure 2 is a perspective view cut out a predetermined portion to explain the configuration of a cylindrical storage tank according to an embodiment of the present invention. 3A to 3C are perspective views illustrating a method of manufacturing the first cylindrical unit, and FIGS. 4 to 6 are cross-sectional views illustrating a method of manufacturing the cylindrical storage tank using the first cylindrical units. And, Figure 7 is a front view for explaining a method for constructing the heat insulating material in the first stage cylindrical units of the multi-stage shown in Figure 6, Figure 8 is to explain a method of finishing the heat insulating material shown in Figure 7 with a thin sheet of aluminum It is an enlarged section.

As shown in FIG. 2, the present invention can be used as a means for storing stocks such as water, oil, powdered raw materials, and the like, and is a cylindrical storage tank mainly used for storing living and factory water.

Cylindrical storage tank of the present invention is basically welded by stacking four modular first cylindrical unit 100 of the same shape in each of the first to fourth stages (10 to 40) or more.

The upper portion of the cylindrical storage tank is covered with a cover 50 having an entrance and exit 51 and a vent pipe 52 on the upper surface of the first end 10, and then sealed by welding the edge thereof, and the lower portion of the cylindrical storage tank is fourth After the bottom plate 11 is disposed on the lower surface of the stage 40, the edge is welded and sealed.

Here, the inner space of the storage tank and the feed water pipe 12 penetrated to the circumferential surface of the first end 10, the drain pipe 13 is attached to the circumferential surface of the fourth end 40 in the same manner. . In addition, the bottom plate 11 has a flat disk shape or a cone shape in which the shaft center is recessed slightly downward, and a plurality of bolt holes for fixing to the installation road surface are formed at predetermined intervals in the edge portion.

In addition, the cylindrical storage tank is provided with a support shaft 60 perpendicular to the inner shaft core, the upper and lower ends are fixed to the shaft core of the bottom plate 11 and the cover 50. The prop shaft 60 is responsible for the structural load of the cylindrical storage tank, and has an internal ladder 61 attached to the circumferential surface and extends in the axial direction, so that the worker can safely enter the cylindrical storage tank for the purpose of cleaning the tank. To be able.

In addition, the outer ladder 53 is provided on the outside of the cylindrical storage tank to the worker ladder up to the entrance 51 near the ground, the fixing of the outer ladder 53 is the fourth end 40 and the first end It is fixed to the first cylindrical unit 100 of (10).

In particular, since the cylindrical storage tank is composed of the first cylindrical unit 100 made of stainless steel, the heat transfer efficiency is higher than that of the plastic material, and when installed outdoors, the cylindrical storage tank can maintain a relatively high high temperature. It is wrapped with heat insulating material 38, such as processed glass fiber, and thin plate 39, such as aluminum, as a finishing material.

In particular, the first cylindrical unit 100 forms flange portions 110 and 111 having a 'c' cross-section at upper and lower portions of the circumferential portion 112, respectively, and serves as a pedestal for fixing the heat insulating material 38. In addition, by providing a relatively wider welding surface to prevent bending deformation of the cylindrical structure, as well as more excellent water tightness.

These 'c' cross-sectional flange portion (110, 111) is fixed to the edge wall (110a, 111a) bent in the vertical direction by wrapping the thin plate (39) wrapped around the outside using a screw, thereby relatively suppressing the formation of voids The cylindrical storage tank of the invention has better sealing performance and insulation performance. As such, the thin plate 39 is fixed to the first cylindrical unit 100 directly through the screw, thereby eliminating the need for a separate coupler that is responsible for the load in the vertical direction of the thin plate 39.

In the following, the first cylindrical unit 100 of the present invention will be described in detail.

As shown in Figure 3a, the raw material of the initial stainless strip (strip) state is made of a basic first cylindrical unit 100 by a sheet metal equipment capable of the press-in / cut / bend operation. The basic first cylindrical unit 100 has a circumferential portion 112 having a cylindrical shape in a lateral direction (circumferential direction), and a flange portion 110 having a 'C' cross-sectional shape at the top and bottom of the circumferential portion 112. 111).

Here, the flange portion (110, 111) of the cross-section '' 'is provided with a border wall (110a, 111a) formed integrally bent to provide a joint surface between the cylindrical units, and the inside and outside of the cylindrical storage tank Dual welding is possible at, and serves to increase the durability of the cylindrical structure. In addition, the flange portion (110, 111) of the cross-sectional shape of the '' 'form a space such as a channel in the inner side of the edge walls (110a, 111a), and serves as a stand for the heat insulating material and a fixing plate of the thin plate as a finishing material It is a very important component.

Thereafter, the basic first cylindrical unit 100 is subjected to sheet metal processing such as chamfering by manual or predetermined cutting equipment. That is, the sheet metal working worker cuts out the four corner parts 101-104 divided by the cutting line 105, and forms the vertical walls 140 and 141 in the both ends of the circumference part 112, respectively.

The vertical walls 140 and 141 of the circumferential portion 112 thus formed are folded in the outward direction a with respect to the fold lines 120 and 121 by a bending machine such as a folding / holding machine. Lose.

As shown in FIG. 3B, the folded vertical walls 140 and 141 are closely adhered to the edge walls 110a and 111a, respectively, so as to act as flanges arranged in the transverse direction. This tight contact is welded along the seam.

And, when the operator tightens the circumferential portion 112 of the first cylindrical unit 100 in the transverse direction by using a rope, the vertical walls (140, 141) facing each other gradually come closer (b), eventually to interview each other do.

As shown in FIG. 3C, the joint lines of the vertical walls 140 and 141 which are in contact with each other are welded to complete the first cylindrical unit 100 having the flange portions 110 and 111 having a cross-sectional shape of the letter 'C'.

On the other hand, the first cylindrical unit 100 can be formed to have a 'c' cross-sectional shape in the vertical wall (140, 141) in order to further strengthen the load in the vertical direction. In addition, it is also possible to form a plurality of bolt holes in the vertical walls 140 and 141 to joint the bolts and nuts, respectively, for the purpose of further increasing the joining force by welding. In addition, road surface mounting bolt holes 119 are formed in the flange portions 110 and 111 of the 'C' cross section of the first cylindrical unit 100, and the coupling efficiency between the cylindrical units is matched to improve work efficiency. A reference hole 118 is formed that can be increased.

Hereinafter, a process of assembling the cylindrical storage tank by stacking the first cylindrical unit 100 in multiple stages will be described in detail.

As shown in FIG. 4, the bottom plate 11 is disposed on the storage tank installation road surface 90, and the first cylindrical unit of the fourth stage 40 carried by the carrying facility 156 such as a crane thereon. (100 "). Then, the lower part of the first cylindrical unit (100") of the fourth end 40 is welded to the bottom plate (11) by a T-joint, thereby closing the opened lower part of the storage tank. . At this time, the weld portions 161 and 162 of the first cylindrical unit 100 "are formed on the surface of the bent portion 113 of the lower flange portion 111" and the outer joint line. Here, the bent portion 113 is a bent portion vertically bent at the circumferential portion 112 ″, and provides a relatively wide welding surface to increase the joining force of the welding, and because the bending force acts, By sufficiently supporting the hydraulic pressure of the storage tank, it increases the durability and structural rigidity of the cylindrical storage tank of the present invention.

In addition, since the inner welding portion 161 butt weld each bending portion 113 to which the bending force is applied to each other, the bonding force is relatively large, and there is no need to form a separate chamfering surface, so the welding construction is very easy. There is.

In addition, since the welding portion 162 is formed on the outer joint line, the bonding force between the first cylindrical unit 100 "of the fourth end 40 and the bottom plate 11 can be further increased.

Thereafter, the worker fastens the nut to the stud bolt 91 passing through the road surface bolt hole 119 of the first cylindrical unit 100 and the bolt hole 92 of the bottom plate 11, thereby providing a first cylindrical unit ( 100) and the bottom plate 11 are fixed to the installation road surface 90.

Then, the operator arranges the first cylindrical unit 100 ′ of the third stage 30 on the upper portion of the first cylindrical unit 100 ″ of the fourth stage 40 using the transport facility 156.

Referring to the enlarged view of FIG. 5, the first cylindrical units 100 ′ and 100 ″ disposed as described above may have upper flange portions 110 ″ and lower flange portions 111 ′ having a cross-sectional shape of a letter “C”. You will be interviewed.

The operator butt welds the inner bent portions 114 and 115 and the outer bent portions 116 and 117 of the flange portions 110 " and 111 &quot; that are in contact with each other in the circumferential direction, respectively, to the weld portions 163 to the inner and outer joint lines. , 164, respectively.

Thus, each of the first cylindrical units 100 ', 100 "is welded in duplicate as mentioned above, so that the watertightness is relatively high and the bonding strength is very strong.

As shown in FIG. 6, each of the first cylindrical units 100, 100 ′, 100 ″ is stacked to have four stages 10 to 40 by the assembly method described above, and then the lid 50 is formed. By covering the opened upper part of the 1st cylindrical unit 100 of the 1st stage 10, it becomes a unit assembly which has a cylindrical structure.

In the following, it will be described in detail how to the heat treatment and finishing treatment to the unit assembly described above.

As illustrated in FIG. 7, each of the first cylindrical units 100, 100 ′, 100 ″ having the shape of the storage tank is thermally insulated from each end 10-10 for thermal insulation and insulation. 40. The length of the insulation 38 has a width and a length to enclose the circumferential portion 112 "of the first cylindrical unit 100", in particular, the edge walls 110a and 111a. It has a thickness that can be seated in the channel formed inside of.

Thus, the heat insulator 38 is wound correspondingly to the surface of the circumferential portion 112 ″, and both ends of the heat insulator are disposed to fit snugly to the left and right sides of the vertical walls 140 and 141 vertically, and the upper and lower flange portions It is hermetically fitted to the channels of the 110 "and 111", and the edge walls 110a and 111a serve as the fixing jaw, and can hermetically wrap the first cylindrical unit 100 ".

As shown in FIG. 8, the insulating materials 38 are respectively wrapped on the outside of the cylindrical units 100 ′ and 100 ″ stacked in each stage, and thin plates 39a and 39b such as aluminum are finished for finishing. It is attached slightly overlapping in the circumferential direction.

At this time, the thin plates 39a and 39b are tightly fixed to the edge walls 110a and 111a of the upper and lower flange portions 110 "and 111" which are in contact with each other by screwing using the drill screw 37.

Since the insulator 38 has superior swelling than the structural member, the insulation 38 hermetically fills the inner space (inside the channel) surrounded by the surfaces of the thin plates 39a and 39b and the cylindrical units 100 'and 100 ", Cylindrical storage tanks installed on the floor allow for excellent thermal insulation.

Thus assembled cylindrical storage tank of the present invention consists of a modular cylindrical unit, a bottom plate and a cover, it is relatively easy to work high compared to bolting work, because it adopts a method of welding a small number of cylindrical units And assembling cost can be significantly reduced, it is possible to easily produce a large-capacity water tank, mass production is easy.

In addition, the cylindrical storage tank of the present invention can be manufactured with second and third cylindrical units, which provide similar but very excellent performance.

As shown in FIG. 9, the second cylindrical unit 200 forms flange portions 1110 and 111 having a 'c' cross-sectional shape at the top and the bottom thereof as described above.

The second cylindrical unit 200 is a cylindrical storage tank that is installed outdoors, so that even in the summer can not be blocked with insulation, when the temperature changes in summer and winter, by repeating the contraction and expansion of the cylindrical unit itself, The circumferential portion 112 is integrally bent and has a plurality of bent grooves 201 protruding outward or inwardly so as to attenuate the load on the welded portion.

Here, the bending grooves 201 have an inner diameter of about 3 mm to 4 mm in a semicircular cross-sectional shape and extend in the circumferential direction of the second cylindrical unit 200.

The purpose of the bending groove 201 is to prevent bending of the cylindrical structure due to the surface thermal expansion of the cylindrical unit or increasing the load on the welding site, unlike the purpose of forming a bending portion in the general structural material and increasing the structural rigidity. to be.

For this purpose, the second cylindrical unit 200 forms two to three bending grooves 201.

In addition, the bending groove 201, by making a bone, when the water filled in the cylindrical storage tank is naturally rotated, and smoothly the flow of water, thereby playing an additional role of lengthening the residence time of water and chlorine.

As shown in FIG. 10, the cylindrical storage tank of the present invention provides a third cylindrical unit 300 having a plurality of inclined bent grooves 202. The role of the inclined bent groove 202 is similar to the inclination angle of the water screw that occurs when the water filled in the cylindrical storage tank is discharged or entered into the outside, so that the flow of water and chlorine contact more smoothly It is to help.

As shown in Figure 11, the cylindrical storage tank of the present invention is a cylindrical unit having the flange portion of the 'c' cross-section formed integrally bent in a multi-stage (10 to 40) and then welded to each other, By providing a cylindrical storage tank structure that can be manufactured and assembled economically, and does not require a separate internal reinforcement, it doubles the strength of the product with the construction economic effect.

In addition, the cylindrical storage tank of the present invention, by using a thin plate (39c) having an outer inclined groove 203, to prevent the appearance deformation due to thermal deformation, the assembly line is made very clean and beautiful.

As shown in FIG. 12, the cylindrical storage tank of the present invention is integrally bent to form a multi-stage stack of fourth cylindrical units 300 ′ having flange portions 301 and 302 having a cross-sectional shape close to the letter 'W'. Then, by welding with each other, it can be manufactured and assembled very economically, and by providing a cylindrical storage tank structure with a larger structural rigidity, it is possible to maintain the robustness of the product with the construction economic effect.

As described above, since the cylindrical storage tank according to the present invention is assembled with a cylindrical unit in which the flange portion of the 'c' cross section is integrally formed, the bonding force between the cylindrical units is relatively very large as compared with the conventional flange coupling. There is a solid advantage.

In addition, the cylindrical storage tank of the present invention is fixed to the heat insulating material because it is in close contact with the thin plate screwed to the rim wall of the flange portion after the heat insulating material is seated inside the flange portion of the '' 'cross-sectional shape during insulation / insulation construction Has the effect, there is an advantage that can further improve the thermal insulation / insulation performance.

In addition, the cylindrical storage tank of the present invention is manufactured and assembled as compared to the conventional storage tank that can be mass-produced by welding construction and multiple plates are joined by bolting by stacking modular cylindrical units in multiple stages. There is an advantage that the work and altitude work is very easy.

In addition, the cylindrical storage tank of the present invention is excellent in watertightness due to the double welding portion, there is an advantage to improve the safety of the storage tank without the internal reinforcement.

In addition, the cylindrical storage tank of the present invention has the advantage of minimizing the load due to heat deformation that can be applied to the welding portion through the bent groove formed in the circumference of the cylindrical unit.

In addition, the cylindrical storage tank of the present invention has the advantage that by temporarily leaving the flow of water in the bent groove, double the rotational force of the water and thereby make the residence time of water and chlorine long.

In addition, the cylindrical storage tank of the present invention can seal the heat insulating material of the cylindrical unit with a thin plate, the appearance is beautiful and clean finish, there is an advantage to improve the product quality.

Although the technical idea of the cylindrical storage tank of the present invention has been described together with the accompanying drawings, this is illustrative of the best embodiment of the present invention and is not intended to limit the present invention. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (8)

In the cylindrical storage tank in which the lid 50 and the bottom plate 11 are sealed in a unit assembly in which cylindrical units 100, 100 ', 100 ", 200, and 300 are laminated in multiple stages, A flange portion (110, 110 ", 111, 111 ', 111") having a' C 'cross section formed integrally with the upper and lower portions of the cylindrical units (100, 100', 100 ", 200, 300); A heat insulating material (38) seated by the edge walls (110a, 111a) of the flange portions (110, 110 ", 111, 111 ', 111"); Thin plates 39, 39a, 39b and 39c screwed to the edge walls 110a and 111a to closely contact the heat insulating material 38 to the cylindrical units 100, 100 ′, 100 ″, 200 and 300. Cylindrical storage tank comprising a. The method of claim 1, The flange portions 110, 110 &quot;, 111, 111 &quot;, and 111 " of the '' 'cross section increase the adhesion of the cylindrical units 100, 100', 100 &quot;, 200, and 300 stacked in multiple stages. And a welded portion (161, 163, 164) welded to the inner and outer bent portions (113, 114, 115, 116, 117) to which the bending force acts, respectively. The method of claim 1, The flange portion (110, 111) of the '' 'cross-sectional shape is formed with a bolt hole 119 for the road surface installation, the reference hole 118 that can increase the working efficiency by matching the coupling direction between the cylindrical units Cylindrical storage tank, characterized in that is formed. The method of claim 1, The cylindrical unit 200 is a plurality of bending grooves 201 protruding outside or inside by integrally bending the circumferential portion 112 so as to attenuate the load on the welded portion by contraction and expansion due to external temperature change. Cylindrical storage tank, characterized in that having. The method of claim 1, The cylindrical unit 300 is a cylindrical storage tank, characterized in that it has a plurality of inclined bent grooves (202) in order to facilitate the flow of water filled therein and to help the contact of water and chlorine. The method of claim 1, The bottom plate (11) is a cylindrical storage tank, characterized in that a plurality of bolt holes (92) for fixing to the installation road surface is formed at predetermined intervals on the edge portion. The method of claim 1, The thin plate (39c) is a cylindrical storage tank, characterized in that the outer inclined groove (203) is formed to prevent the appearance deformation due to thermal deformation. The method of claim 1, The cylindrical unit 300 'is integrally bent and assembled into flange portions 301 and 302 having a cross-sectional shape close to the letter' W 'to provide a cylindrical storage tank structure with more structural rigidity. Cylindrical storage tank.