KR200331709Y1 - Multistage wave water tank - Google Patents

Abstract

The present invention extends and welds the first, second, and third wave panels to a plurality of stages at least in the up and down direction, and includes a reinforcing bracket, a reinforcing column, and a reinforcing beam. It is to provide a multi-stage wave water tank capable of providing the identified product to the consumer.

The multi-stage wave water tank of the present invention includes a bottom plate 201 for sealing a lower portion of the sidewalls 202 and 203 of a round curved surface; It consists of a top plate 204 for sealing the upper portion of the side wall (202, 203), the stainless material thickness and height of the side wall (202, 203) can be welded to each other in the height direction to cook according to the water storage capacity A plurality of first, second and third having at least one stage of the base (208, 209), the lower flange 210 and the upper flange 220 welded to the upper end and the lower end of the base (208, 209) Wave panels 200, 200 ', and 200 "; the first and second connected to the sidewalls 202 and 203 in a state where the wave panels 200, 200' and 200 " And a plurality of reinforcing brackets 300 and 320 welded horizontally to the respective round valley portions 241 on the contact lines between the third wave panels 200, 200 ′ and 200 ″ to be mass-produced by standardizing the storage capacity. Can be.

Description

Multistage wave water tank {MULTISTAGE WAVE WATER TANK}

The present invention relates to a wave water tank, and more particularly, to form a volume to hold water by connecting each side of each of the round panels or wave panels made of stainless steel, such as a water tank having a continuous round square structure The present invention relates to a multi-stage wave water tank that disperses and absorbs most of the water pressure in the sidewalls of the round curved surface.

In general, large water tanks installed in factories, construction, agricultural and livestock, and buildings have a variety of forms depending on the size and use of the facility. These large water tanks are formed by masonry, masonry, concrete placing, panel assembly, which is formed by pre-formed steel panels or plastic resin panels by bolts or welding, and plastic resin molding. It is classified into a LIPP method in which the longitudinal side of the steel strip is welded in the spiral direction, and a cylindrical unit stacked type in which a plurality of cylindrical flange units are laminated and bonded in the height direction.

In addition, the water tanks are concrete materials that are unsanitary and difficult to maintain after a long time due to the characteristics of the materials, FRP (Fiber Reinforced Plastics) materials that are small and have a lifespan of 7 to 8 years, and SMC (for 10 years). Sheet Molding Compound) and semi-permanent use make stainless steel material highly economical compared to water tank.

In particular, stainless steel water tank is known for minimizing water pollution due to its excellent durability, corrosion resistance, and corrosiveness as well as semi-permanent use due to the characteristics of the material. Although the material cost is relatively high compared to other materials, once installed, it is 20 years Due to the nature of the water tank used above, the economic efficiency compared to the service life is incomparable with other materials.

Currently, commercial buildings used by many people have a large capacity of water tanks, so it is common to have a hexahedron shape rather than a cylindrical shape.

Further, as a conventional technique, the tank panel disclosed in Japanese Patent Application Laid-open No. Hei 09-286489 forms a swelling portion over the entire longitudinal direction, and at the same time forms a narrow flat portion on both sides of the swelling portion. A connecting portion connected to the flat portion is provided, and reinforcing plates are provided to block the upper and lower ends of the bulge portion, and a plurality of panels are continuously formed integrally.

In addition, as another conventional technique, the tank disclosed in Japanese Patent Laid-Open No. 12-177790 has a bottom plate portion formed of a flat plate material and a square cylinder shape which is provided upright at intervals adjacent to the outer circumference of the bottom plate portion. A support plate and a side plate which are installed by coupling a lower end portion to an outer rim of the bottom plate portion are provided, and when the side plate is formed, the side plate piece is curved in a one-way arc shape at the center of the side plate piece, and A connecting member formed by forming a straight flat portion on both curved edges of the center portion, butt-welding in the center to be welded to the center so that the flat portion of the side plate piece overlaps the angular cylindrical surface of the support. Excreted.

However, the above-mentioned conventional techniques do not standardize the appropriate material thickness for various sizes and capacities by modeling by stainless material and thickness and capacity, and not only requires a lot of manufacturing costs for the commercialization, but also for products ranging from small to large capacities. There is a disadvantage that can not satisfy the consumer having a variety of capacities to buy the structural safety can not be guaranteed.

In addition, conventional panels or tanks have a relatively large amount of connection materials because of the use of a connection material in which the pillars are arranged in a lattice shape, and it is insufficient to absorb most of the water pressure in the side wall itself. Water tank is not enough.

In order to secure such a point, the applicant has devised a water tank having a continuous rounded square structure of September 11, 2002, Republic of Korea Patent Application No. 55033, its Utility Model Registration No. 20-2002-0027276. As shown in FIG. 1, it has a continuous rounded square structure 1 having a continuous rounded curved sidewall, an upper plate 20 fixed to the upper sidewall of the continuous rounded square structure 1, and a lower portion of the sidewall. And a fixed bottom plate 30. In addition, the conventional water tank is installed vertically on the upper surface of the bottom plate 30, welded in the horizontal direction, the left and right bending portions and the upper and lower sides of the round curved surface respectively bent in the front direction on the left and right sides of the round curved surface A plurality of round panels 10 each having upper and lower bent portions bent in the rearward direction; A plurality of stud bolts fixed perpendicular to the side walls for thermal insulation and exterior construction; Insulation material coupled to surround the side wall; A thin plate sheathing material surrounding the outer surface of the heat insulating material; By including the pole poles (83, 85) for fixing such a sheathing bolt to the stud bolts to be in close contact with the side wall, the insulation and the sheathing material has a '3' cross-sectional shape continuously corresponding to the continuous round outer surface of the side wall. will be.

Reference numerals '21' and '22' are hook-shaped fixtures, '23' is a manhole cover, '24' is an air exhaust pipe, '31' is a foundation, and '40' is a piping member.

In addition, the applicant can model the continuous rounded square structure from small capacity (tens of tons) to large capacity (thousands of tons) in the stage of continuous technical development and realistic commercialization. The proper material thickness for the capacity can be standardized, and the corresponding reinforcement structures have been identified, resulting in the following results.

Accordingly, an object of the present invention is to solve the problems of the prior art described above, welding the first, second, and third wave panels of a continuous rounded square structure in multiple stages in accordance with product capacity, reinforcing beams, reinforcing columns, It is equipped with a reinforcement bracket and can be manufactured at the minimum manufacturing cost by standardizing the appropriate material thickness for various sizes and capacities by modeling by stainless material and thickness and capacity, and can provide products with confirmed structural safety to consumers. To provide a multi-stage wave water tank.

1 is a perspective view for explaining a water tank having a continuous rounded square structure according to the prior art,

Figure 2 is a perspective view for explaining the configuration of a multi-stage wave water tank according to an embodiment of the present invention,

3 is an exploded perspective view of the multi-stage wave water tank shown in FIG.

4 is a perspective view for explaining a manufacturing method and a bonding method of the first wave panel shown in FIG.

5 is a stress and strain distribution diagram of the multi-stage wave water tank shown in FIG.

Figure 6 is a perspective view for explaining the configuration of a multi-stage wave water tank according to an application of the present invention,

7 is a perspective view for explaining a manufacturing method and a bonding method of the second wave panel shown in FIG.

8 is a stress and strain distribution diagram of the multistage wave water tank shown in FIG.

9 is a perspective view for explaining the configuration of a multi-stage wave water tank according to another application of the present invention,

10 is a stress and strain distribution diagram of the multistage wave water tank shown in FIG.

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

200, 200 ', 200 ": 1st, 2nd, 3rd wave panel 201: bottom plate

202, 203: side wall 204: top plate

208, 209: base material 300, 320: reinforcement bracket

340: reinforcement pillar 360: reinforcement beam

An object of the present invention as described above and the bottom plate for sealing the lower portion of the side wall of the round curved surface; A panel welded water tank comprising an upper plate sealing an upper portion of the side wall, the panel weldable water tank comprising: at least one base material weldable to each other in a height direction so as to cook and select a stainless material thickness and height of the side wall in accordance with a water storage capacity; A plurality of first, second, and third wave panels having lower and upper flanges welded to upper and lower ends of the base material; A plurality of reinforcement brackets horizontally welded to the respective round valley portions on the contact line between the first, second, and third wave panels connected at the sidewalls in a state of being horizontal to the width direction of the sidewalls and aligned at a predetermined height; It is achieved by a multi-stage wave water tank comprising a.

In addition, the continuous rounded square structure provided throughout the embodiment is a single body in which no panels are assembled or welded in the up and down direction, and the first, second, third wave panels or round panels are manufactured to have a bending deformation from the beginning. It refers to a planar wall structure in which any one of the cylindrical panels is continuously welded in the left direction and the vertical direction such that '3' cross sections are continuously connected.

The continuous rounded square structure of the present invention is a wave panel or a cylindrical panel that is generally rectangular or curved, respectively, by placing each wave panel and the cylindrical panel in the height direction on the bottom surface and then welding both sides thereof continuously. It is a structure that can disperse the hydraulic pressure, and the welding site itself plays a role of the transverse direction and is distributed along the round curved surface, so that the stress can be naturally distributed in the shear direction without the need for the horizontal reinforcement angle.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention in more detail as follows.

In the drawings, Figure 2 is a perspective view for explaining the configuration of a multi-stage wave water tank according to an embodiment of the present invention, Figure 3 is an exploded perspective view of the multi-stage wave water tank shown in Figure 2, Figure 4 is a FIG. 5 is a perspective view illustrating a manufacturing method and a bonding method of the first wave panel, and FIG. 5 is a stress and strain distribution diagram of the multi-stage wave water tank shown in FIG. 2. In addition, Figure 6 is a perspective view for explaining the configuration of the multi-stage wave water tank according to the application of the present invention, Figure 7 is a perspective view for explaining the manufacturing method and the coupling method of the second wave panel shown in Figure 6, FIG. 8 is a stress and strain distribution diagram of the multistage wave water tank shown in FIG. 6. In addition, Figure 9 is a perspective view for explaining the configuration of a multi-stage wave water tank according to another application of the present invention, Figure 10 is a stress and strain distribution of the multi-stage wave water tank shown in FIG.

The present invention is to use a stainless material 'POSCO-304' or 'POSCO-329J3L' having the physical properties as shown in Table 1 below.

This stainless material is unitized with the first, second, and third wave panels in which the round curved surface and the flange are integrally formed by a welding joint method or a foam block molding method after individual sheet metal processing as shown in FIG. 4 below. .

Here, the first wave panel is 950 mm in width, 1940 mm in height, and the thickness is indicated in the following [Table 2] or [Table 3]. The second wave panel welds the second rounded base material equally rounded at half height on the first base material of the first wave panel, and as a result, has a height 1.5 times higher than that of the first wave panel. The third wave panel is welded to extend the first base material in the height direction, and as a result, it is preferable that the third wave panel has a height twice that of the first wave panel.

The present invention is to weld the wave panel in the transverse direction in one side, that is, there is only one stage, there is no top, there is only a bottom, there is a tank having a water storage capacity of 20 to 50 tons, and a plurality of stages, that is, the bottom and the top, but the height of the top It is a tank having a water storage capacity of 100 to 200 tons and a tank having a water storage capacity of 300 to 1500 tons because the height of the bottom and the top is the same in multiple stages.

Table 2 below lists multi-stage wave water tank optimization analysis data for various product models using a reinforcement column with a thickness of 4.0t.

Yield safety factor (yield strength / maximum stress) of the material 'POSCO-304' is 20.9 / maximum stress, as indicated by the note number a) in [Table 2], and yields the material of 'POSCO-329J3L' as shown in b). The safety factor is 45.9 / maximum stress, and the fracture safety factor (maximum tensile strength / maximum stress) of 'POSCO-304' material is 53.1 / as shown in c), and the fracture safety factor of 'POSCO-329J3L' is 63.3 / Maximum stress

The optimization analysis is a linear static analysis of the structural analysis program product name 'IDEAS (Ver. 8)' which examines the strength and stiffness side, and modeled the beam elements of reinforcement beams, reinforcement columns and bridge type reinforcement brackets. Except for the fact that all the plate parts are modeled by 'Thin Shell element', the analysis of the bottom plate is omitted on the premise that it is structurally safe because the base and the bottom plate are in perfect contact.

As a result, the present invention has a thickness of 1.0 to 2.0 ton as shown in the above [Table 2], and a breakdown safety factor of 1.6 to 8.2 when the 'POSCO-304' material is applied and a breakdown safety factor of 1.9 when the 'POSCO-329J3L' material is applied. 9.7 to have a sufficient strength to withstand the water pressure of the water of the corresponding capacity and to safely store the water.

The multi-stage wave water tank of the present invention shown in FIGS. 2 and 3 is a small-capacity (20-50 ton) single-stage tank having only one stage, which is combined by the first wave panels 200, and the multi-stage type of the present invention. The wave water tank may be erected vertically on the foundation 100 with various tubing 101.

The bottom plate 201 of the same stainless material is installed on the upper surface of the foundation 100, and the plurality of first wave panels 200 are welded upward from four peripheries of the bottom plate 201, and each of the plurality of first plates One wave panels 200 are welded to each other in the horizontal direction (width direction of the side wall) to form a continuous three-sided round curved sidewalls (202, 203).

The upper portions of the side walls 202 and 203 are sealed by the upper plate 204 having at least one manhole cover 240. The top plate 204 is made of stainless steel or a honeycomb panel.

The side walls 202 and 203 have two short widths and two long widths, and have a round or wave curved surface and are formed in a box shape that is almost rectangular in shape.

In the small capacity (20-50 ton) single-stage tank, each short width side wall 202 requires 3 to 4 (EA) first wave panels 200, and each long width side wall 203 4-5 pieces are needed.

The reinforcement brackets 300 and 320 may use a bridge type (leg type), a fan shape, a triangular plate member or a pipe member having a gentle round curve, and the like for reinforcing the side walls 202 and 203.

The reinforcement brackets 300 and 320 are horizontally aligned with the width directions of the side walls 202 and 203 and aligned at a predetermined height, and are connected to the first wave panels connected to the outer side (outer surface side) of the side walls 202 and 203. It is welded to each round valley 241 formed symmetrically on the contact line between them.

The reinforcement brackets 300 and 320 are round bone portions 242 which are formed symmetrically by connecting the lower flanges 210 of each of the first wave panels 200 to each other for the purpose of reinforcing the side walls 202 and 203. The upper flanges 220 are also welded to the round valley 243 which is formed symmetrically in contact with each other. The thickness of the reinforcement brackets (300, 320) is 1.5t when the tank is applied to 20/30/50 tons, 2.0t when the tank is applied to 100/200 tons, and 300/500/600/1000/1500 tons. Is preferably 2.0t.

The reinforcement column 340 is a reinforcement of stainless steel having a cross section such as a straight, 'b' shape, 'c' shape, 'C' shape, 'ㅁ' shape, 'I' shape, triangle, hook type.

The reinforcement column 340 is formed at each of the round tip portions 244, 244a, and 244b symmetrically formed on the contact line between the first wave panels 200 connected at the inner side (inner surface side) of the side walls 202 and 203. ) Is fixed in the height direction.

The thickness of the reinforcing column 340 is preferably 2.0 to 4.0t over the entire product (model) of the present invention.

In the 20/30/50 ton tank, even if the reinforcement column 340 having a thickness of 2.0 to 4.0t was used, there was no difference in yield safety or breakdown safety factor. However, in a tank of 100 tons or more, the thickness of the reinforcement column 340 was 2.0t. When used, there was a significant difference in yield and fracture safety rates (see shaded areas). For example, the above [Table 2] is a result table when using the reinforcement column 340 having a thickness of 4.0t, and the following [Table 3] is a result table when using the reinforcement column 340 having a thickness of 2.0t.

On the other hand, the reinforcement beam 360 has a size of 50mm × 30mm × 1.5t.

The reinforcement beams 360 are arranged in plural only in the sidewalls 203 of the long width facing each other and standing apart. At this time, both ends of the reinforcing beams 360 are welded to the tip portions 244a and 244b of the long sidewall 203, respectively, and are connected to each other in a bridge shape.

The reinforcement beam 360 serves to support the top plate 204 and serves as a tension bar or a beam that pulls the sidewalls 203 of the long widths in a hydraulic operation.

As shown in FIG. 4, the first wave panel 200 welds the lower flange 210 and the upper flange 220 vertically at the upper and lower ends of the first base material 208 of the round curved surface. It is produced by.

The first base material 208 has a round curved surface curved by a predetermined slope over the entire longitudinal direction by pressing the stainless material of the flat plate.

The lower flange 210 and the upper flange 220 have a 휜 shape corresponding to the round curved slope of the first base material 208.

The lower flange 210 and the upper flange 220 provide an assembly environment that can be stacked by providing a smooth surface perpendicular to the first base material 208.

Therefore, each of the first wave panels 200 having the lower flange 210 and the upper flange 220 is welded with other first wave panels in the width direction, or the flanges are welded with each other in the height direction to form sidewalls. It is possible.

Further, although the first base material 208 of the round curved surface or the second and third base materials to be described below are not visually shown in the present description, the utility model registration double application number 20-2002-0027276 filed by the present applicant It is fabricated with various surface shapes (embossing, dimples, pleats, double round curved surfaces, continuous round borders, etc.) as disclosed in a water tank having a continuous rounded square structure of arcs.

In addition, the lower flange 210 and the upper flange 220 or the reinforcing flange and the band of the following to increase the rigidity of the unit of the building integrated rainwater collecting tank of the utility model registration dual application No. 20-2003-0014380 filed by the applicant Like the cross-sectional shape of the upper and lower flange bent portion, it is preferable that the end is bent into any one of the shapes of 'a', 'b', 'c', 'ㅁ' and 'ㅇ'. .

FIG. 5 exemplarily shows a stress and strain distribution diagram of a 20 ton multistage wave water tank using a first wave panel having a thickness of 1.5t.

In terms of yield safety factor (which causes plastic deformation at yield safety factor of 1 or less), which shows the limit that causes plastic deformation (permanent deformation), it showed safe results as 1.4 to 7.1 when applying 'POSCO-329J3L' material, but 'POSCO-303' In the application of the material, plastic deformation of 0.4 to 3.2 may cause plastic deformation in some products.

6 is a medium-capacity (100-200 ton) 1.5 stage tank having the same layout as described in detail above except for being combined by the second wave panels 200 '.

However, in the medium-capacity 1.5 stage tank, each short width side wall 202 requires 5 to 7 (EA) second wave panels 200 ', and each long width side wall 203 is 8 to 11 are required.

As shown in FIG. 7, the second wave panel 200 ′ used to manufacture the 1.5-stage tank has the same curved shape at the height of half of the first base material 208 and the first base material 208 of a round curved surface. After welding the second base material 209 to extend in the height direction, the lower flange 210 is welded to the lower end of the first base material 208 and the upper flange 220 is welded to the upper end of the second base material 209.

If necessary, the second wave panel 200 ′ or the third wave panel below may have a plurality of upper and lower flanges 210 and 220 along the welding line where the first base material 208 and the second base material 209 meet. Reinforcing flanges 290, 291, 292 or bands of the (bend) may be further welded in the horizontal direction.

FIG. 8 exemplarily shows a stress and strain distribution diagram of a 100-ton multistage wave water tank using a second wave panel having a thickness of 1.5t of a lower end (first base material) and a thickness of 1.5t of an upper end as multiple stages.

Since the multi-stage wave water tank using the second wave panel 1.5 times higher and 1.5 times higher than that of the first wave panel forming one stage may have weak rigidity (strain), the first and second base materials may be It is preferable not to apply the thickness below 1 mm.

The present invention as shown in FIG. 9 is a large capacity (300-1500 ton) two-stage tank having the same layout as described in detail above except that it is combined by the third wave panels 200 ", Description is omitted.

However, in the medium-capacity two-stage tank, each short width side wall 202 requires 8 to 19 (EA) third wave panels 200 ", and each long width side wall 203 is 8 to 11 are required.

FIG. 10 exemplarily shows a stress and strain distribution diagram of a 1500-ton multistage wave water tank using a third wave panel having a thickness of 2.0t of a lower end (first base material) and a thickness of 1.5 of an upper end as multiple stages.

In general, since the rigidity and strength of the reservoir is related to the hydraulic pressure and the hydraulic pressure is related to the reservoir height, it is preferable that the height of the reservoir is designed to minimize the height in consideration of the sensitivity of the height influence.

On the other hand, since the second wave panel or the third wave panel is welded with the first base material and the second base material, thickness 1.5t and 2.0t can be selectively selected and economically selected for the product installation environment.

The multi-stage wave water tank of the present invention configured as described above can be manufactured at the minimum manufacturing cost by standardizing the selection of appropriate material thickness and reinforcement beams for various sizes and capacities by modeling by stainless material and thickness and capacity. There is an advantage in that it is possible to provide the consumer with a confirmed product safety.

In addition, the multi-stage wave water tank of the present invention has the effect of being able to be commercialized in a state where structural safety has been verified, even though a large-sized reservoir such as 1500 tons despite the use of a reinforcement beam of a straight array rather than a lattice shape.

In addition, the multi-stage wave water tank of the present invention is further optimized by fabricating the first, second, and third wave panels by welding a second base material having a height of half or a first base material having the same height to a first base material having a reference height. Based on the analysis result, it can be mass-produced as a reservoir in consideration of optimum stability and economical efficiency by selectively combining thicknesses as needed, and thus, there is an advantage that it can provide consumers with a lean, economical, cheap and safe product. .

In addition, the water tank of the present invention can be assembled and installed in a very short time relative to the conventional assembled panel plant tank according to the wave panel welding construction, it has an economic effect according to the air shortening.

In addition, the water tank of the present invention is a characteristic product, such as various forms of embossing, dimples, pleats, double round curved surfaces, a top plate having a continuous round border, there is a wide range of choices compared to a simple rectangular water tank .

Although the technical idea of the multi-stage wave water 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 (10)

A bottom plate 201 for sealing a lower portion of the sidewalls 202 and 203 of the round curved surface; In the wave water tank consisting of a top plate 204 for sealing the top of the side walls (202, 203), At least one stage of the base materials 208 and 209 weldable to each other in the height direction so that the stainless material thickness and the height of the side walls 202 and 203 can be selected according to the water storage capacity, and the base materials 208 and 209 A plurality of first, second and third wave panels 200, 200 ′, 200 ″ having a lower flange 210 and an upper flange 220 welded to the upper end and the lower end; The first, second, and third wave panels 200, 200 ', 200 "connected to the sidewalls 202, 203 in a state where the sidewalls 202, 203 are horizontal and aligned at a predetermined height. Multi-stage wave water tank, characterized in that it comprises a plurality of reinforcing brackets (300, 320) horizontally welded to each round bone portion (241) on the contact line between. The method of claim 1, The reinforcement brackets 300 and 320 are round bone portions 242 symmetrically formed by connecting the lower flanges 210 and the upper flanges 220 symmetrically connected to each other ( 243), wherein the multistage wavewater tank has any one of a bridge shape, a fan shape, and a triangular shape having a gentle round curve. The method according to claim 1 or 2, The reinforcement brackets 300 and 320 have a thickness of 1.5 tons when the reinforcement brackets 300 and 320 are applied to a 20/30/50 ton water tank, and have a thickness of 2.0 tons when applied to 100/200 tons, and 300/500 /. Multi-stage wave water tank, characterized in that the thickness is 2.0t when applied to 600/1000/1500 tons. The method of claim 1, As fixed to the respective round tip portions 244, 244a and 244b of the side walls 202 and 203, the straight, 'b', 'c', 'C', 'ㅁ' and 'I' Multi-stage wave water tank, characterized in that it further comprises a plurality of reinforcement pillars (340) of a stainless material having a cross section, such as a shape, a triangle, a hook. The method of claim 4, wherein Multi-stage wave water tank, characterized in that the thickness of the reinforcing column (340) is 2.0 to 4.0t. The method of claim 1, And a plurality of reinforcing beams 360 made of stainless material welded to only the tip portions 244a and 244b of the long sidewall 203 among the sidewalls 202 and 203 and connected to each other in a bridge shape. Multi-stage wave water tank. The method of claim 6, The reinforcement beam 360 is a multi-stage wave water tank, characterized in that the width 50mm × 30mm × 1.5t. The method of claim 1, The lower flange 210 and the upper flange 220 is characterized in that it has a cross-sectional shape of any one of the letter 'b', 'b', 'c', 'ㅁ', '' Multistage wave water tank. The method of claim 1, The first, second, third wave panel (200, 200 ', 200 ") is a multi-stage wave water tank, characterized in that the thickness is 1.0 to 2.0t. The method of claim 1, The second and third wave panels 200 ′ and 200 ″ may include a plurality of reinforcing flanges 290, 291, and 292 or bands along a weld line where the first base material 208 and the second base material 209 meet. Multistage wave water tank, characterized in that they can be further welded in the horizontal direction.