Prefabricated arch construction panel having high-strength corrugated structure and method for constructing a construction structure using the same

Abstract

The present invention relates to a prefabricated arch construction panel having a high-rigidity corrugated structure and a method for constructing a construction structure using the same. A plurality of prefabricated arch construction panels made of a metal material are curved to have a predetermined curvature and are curved in the longitudinal direction to form an arch shape when joined together. The cross-section of the prefabricated arch construction panel is formed with a macroscopic corrugated structure having a predetermined pitch (P1) and depth (D1), and the ratio of the pitch (P1) to the depth (D1) of the macroscopic corrugated structure is within the range of 1.5:1 to 2.0:1. The above-described prefabricated arch construction panel has flange portions formed at both ends to connect with the side of an adjacent prefabricated arch construction panel, and the flange portions on both sides are characterized by being curved in the opposite direction to the macroscopic corrugated structure. This high-rigidity corrugated structure increases the moment of inertia of the section by more than 50 times compared to a flat steel plate, enabling the panel to stand on its own without a separate internal support frame and further support even the concrete pouring load.

Description

Technology Field

[0001] The present invention relates to a prefabricated arch construction panel having a high-rigidity corrugated structure and a method for constructing a construction structure using the same. More specifically, the invention relates to a prefabricated arch construction panel having a high-rigidity corrugated structure in which the cross-sectional shape of a double corrugated structure consisting of a macro corrugated structure and a micro corrugated structure is optimized so that the panel can stand independently solely by its own rigidity without a separate internal support frame, and a method for constructing a construction structure using the same. Background Technology

[0002] Generally, arched structures forming large spaces, such as tunnels, hangars, shelters, and warehouses, are widely used due to their excellent internal space utilization resulting from the absence of central support columns. However, to support the upper load while maintaining the arched curve, they are typically constructed by first installing internal support frames, such as H-beams or trusses, and then attaching panels to the exterior; consequently, these internal support frames complicate the construction process and are a major cause of increased material and labor costs.

[0003] To solve this problem, Korean Published Patent Application No. 10-2023-0190842, 'Corrugated Panel for Arch-shaped Hangar,' discloses a technology for constructing a self-supporting hangar by fastening panels that are curved in the longitudinal direction and formed with a corrugation in the width direction using bolts.

[0004] However, conventional freestanding panels had limitations in withstanding heavy construction loads, such as concrete pouring to form a protective layer, even though they could stand on their own, because the rigidity of the panels themselves was not sufficiently optimized.

[0005] The method of integrating corrugated steel plates and concrete in advance at a factory, as described in Korean Registered Utility Model Publication No. 20-0417221, 'Precast Arch Panel Using Corrugated Steel Plates,' intended to solve these problems, had the issue of increased production costs and difficulties in transportation and on-site assembly due to the excessive increase in the weight of the panel itself.

[0006] In addition, Korean Registered Patent Publication No. 10-1261069, 'Building Panel and Building Structure,' had a problem where twisting occurred in the panel or it was difficult to control deformation, such as in a novel central section composed of radially arranged longitudinal reinforcing ribs that transition to the side and allow for the joining of panels, while the metal panel was curved into an arch shape, and there was a problem of vulnerability to corrosion due to the characteristics of the metal material. Prior art literature

[0007] Republic of Korea Published Patent Application No. 10-2023-0190842 Republic of Korea Registered Utility Model Application No. 20-0417221 Republic of Korea Registered Patent Application No. 10-1261069 The problem to be solved

[0008] The present invention aims to solve the aforementioned problems. First, it is intended to provide a prefabricated arch construction panel with a maximized moment of inertia, which not only enables self-standing through the assembly of the panel itself without a separate internal support frame but also sufficiently withstands subsequent concrete pouring loads.

[0009] Second, another objective is to provide a panel structure that ensures precise constructability by preventing warping when metal panels are bent into an arch shape.

[0010] Third, another objective is to significantly extend the durability of the structure by ensuring superior corrosion resistance through the combination of a special multi-stage surface treatment and electrodeposition coating on the hot-dip galvanized layer.

[0011] Fourth, the purpose is to provide a construction method for a construction structure that is easy and economical to construct and has excellent protective performance after completion by using the aforementioned high-rigidity, high-durability panels. means of solving the problem

[0012] The prefabricated arch construction panel having a high-rigidity corrugated structure according to the present invention is a metal panel curved to have a predetermined curvature, and is curved in the longitudinal direction to form an arch shape when a plurality of them are joined together.

[0013] In addition, the cross-section of the prefabricated arch construction panel is formed into a macroscopic corrugated structure having a predetermined pitch and depth, wherein the pitch-to-depth ratio of the macroscopic corrugated structure is within the range of 1.5:1 to 2.0:1.

[0014] In addition, the panel has flange portions (100) formed at both ends to be joined to the side of an adjacent panel, and the flange portions (100) on both sides are characterized by being curved in a direction opposite to the macroscopic corrugated structure.

[0015] In addition, preferably, the macroscopic corrugated structure further includes a microscopic corrugated structure formed in a direction intersecting the arch curvature direction, wherein the microscopic corrugated structure is formed in a direction substantially perpendicular to the arch curvature direction, or is formed in a pattern in which multiple corrugations of different lengths intersect to facilitate the formation of curvature of the panel and prevent twisting, thereby having an effect of having a second moment of area 50 times greater than that of a flat steel plate.

[0016] In addition, the pitch of the macroscopic waveform structure is 550 to 650 mm and the depth is 300 to 400 mm, and the microscopic corrugated structure has a corrugated shape with a pitch of 30 mm to 45 mm and a depth of 5 mm to 8 mm.

[0017] In addition, the prefabricated arch construction panel comprises a plurality of prefabricated arch construction panels and a plurality of fastening members for fixing the prefabricated arch construction panels to each other, and further comprises a corrosion-resistant coating layer that is electrodeposited after surface treatment using an electrolyte containing baking soda and borax on a surface that has been hot-dip galvanized or hot-dip galvanized with a zinc-magnesium alloy.

[0018] The method of surface treatment using an electrolyte containing baking soda and borax on the above-mentioned plated surface follows the following procedure.

[0019] The surface treatment method using an electrolyte containing baking soda and borax comprises: a preparation step (S100) of a prefabricated arch construction panel and fastening member plated with hot-dip galvanizing or hot-dip galvanizing-magnesium-ion alloy; a surface modification treatment step (S200) using baking soda and borax in which the prefabricated arch construction panel and fastening member plated with hot-dip galvanizing or hot-dip galvanizing-magnesium-ion alloy is immersed in a surface treatment composition electrolyte to perform surface modification treatment; an electrolytic corrosion treatment step (S300) in which the prefabricated arch construction panel and fastening member plated with hot-dip galvanizing or hot-dip galvanizing-magnesium-ion alloy, which has been surface modified by immersing in the surface treatment composition electrolyte, are connected to an anode (+) and a corrosion-resistant electrode is connected to a cathode (-) to complete electrolytic corrosion treatment, and then a washing process is performed to remove electrolyte components remaining on the surface; and a surface treatment step (S400) in which the prefabricated arch construction panel and fastening member plated with hot-dip galvanizing or hot-dip galvanizing-magnesium-ion alloy, which has been electrolytically corrosion treated, are surface treated using a surface treatment composition. It includes a washing and coating step (S500) in which a resin coating is performed after washing a surface-treated prefabricated arch construction panel and fastening member plated with hot-dip galvanized zinc or hot-dip galvanized magnesium alloy, and a drying and curing step (S600) in which the resin-coated prefabricated arch construction panel and fastening member plated with hot-dip galvanized zinc or hot-dip galvanized magnesium alloy are passed through a drying oven to cure the coating film and completely adhere to the zinc plating layer.

[0020] In addition, in the surface modification treatment step (S200) using baking soda and borax, the surface treatment composition electrolyte is prepared by mixing 2 to 15 parts by weight of baking soda and 0.5 to 8 parts by weight of borax with respect to 100 parts by weight of total water content.

[0021] In addition, in the surface treatment step (S400), the surface treatment composition is a solution containing a zirconium compound, wherein the solution containing the zirconium compound is prepared by including 0.5 to 3.0 g / L of hexafluorotitanoic acid, 1.0 to 5.0 g / L of hexafluorozirconium acid, 0.1 to 2.0 g / L of aminomethyl-substituted polyvinylphenol, and the remainder being water.

[0022] In addition, the present invention provides a method for constructing a construction structure using a prefabricated arch construction panel having a high-rigidity corrugated structure.

[0023] This method comprises: (a) a step of providing the panels; (b) a step of connecting the panels sequentially to form a self-supporting arch structure without an internal support frame; and (c) a step of pouring concrete on top of the self-supporting arch structure to form a protective layer.

[0024] At this time, the panel serves as formwork during concrete pouring, and at the same time functions as a tensile reinforcement and spall liner after the concrete is cured. Effects of the invention

[0025] The prefabricated arch construction panel having a high-rigidity corrugated structure according to the present invention optimizes the pitch-to-depth ratio of the 'macroscopic corrugated structure' to a specific range of 1.5:1 to 2.0:1, and through the unique high-rigidity corrugated structure that adds a 'microscopic corrugated structure' thereto, it has the effect of having a second moment of area more than 50 times that of a flat steel plate of the same thickness.

[0026] Furthermore, when constructing multi-purpose facilities such as general hangars and warehouses, as well as large culverts and tunnels, using prefabricated arch construction panels with a high-rigidity corrugated structure allows for sequential connection of these panels without the need for any separate internal support framework. Additionally, the panels themselves have the effect of supporting the entire load, including the concrete pouring load required to form the protective layer.

[0027] In addition, the unique high-rigidity corrugated structure, which incorporates a 'macroscopic waveform structure' and a 'microscopic corrugated structure,' suppresses the warping phenomenon that occurs during the processing of the panel's main curve (arch), thereby enabling the easy manufacturing of panels with precise curvature.

[0028] In addition, the surface treatment method of the present invention using an electrolyte containing baking soda and borax on a surface plated with hot-dip galvanized zinc or hot-dip galvanized magnesium alloy is an eco-friendly method that does not use any harmful heavy metals such as chromium, and has the effect of ensuring safety in the working environment.

[0029] In addition, the surface treatment method for steel sheet formed products using an electrolyte containing baking soda and borax can selectively apply various coating methods, such as electrodeposition coating alone, a multilayer structure of electrodeposition coating followed by general coating, or general coating alone, thereby having the effect of being able to respond customizedly to the requirements of various industrial fields. Brief explanation of the drawing

[0030] FIG. 1 is a perspective view of a prefabricated arch construction panel having a high-rigidity corrugated structure according to the present invention. Figure 2 is a cross-sectional view of the BB panel of Figure 1, and is a drawing for explaining the high-rigidity corrugated structure. Figure 3 is a surface enlargement view of the panel in Figure 1, and is a drawing to explain the microscopic wrinkle structure. FIG. 4 is a flowchart illustrating a surface treatment method for a steel sheet forming product using an electrolyte containing baking soda and borax according to the present invention. FIGS. 5a to 5e are test reports measuring the physical properties of specimens prepared according to a surface treatment method for steel sheet formed products using an electrolyte containing baking soda and borax. Figure 6 is a graph comparing the surface roughness measurement results of specimens according to the example of the present invention and the comparative example. Specific details for implementing the invention

[0031] The advantages and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described in detail below. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete, and to ensure that the spirit of the present invention is sufficiently conveyed to those skilled in the art.

[0032] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise.

[0033] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0034] Hereinafter, with reference to the attached drawings, a preferred embodiment of a prefabricated arch construction panel having a high-rigidity corrugated structure according to one embodiment of the technical concept of the present invention and a method for constructing a construction structure using the same will be described in detail.

[0035] FIG. 1 is a perspective view of a prefabricated arch construction panel having a high-rigidity corrugated structure according to the present invention, and FIG. 2 is a cross-sectional view of the BB panel of FIG. 1, which is a drawing for explaining the high-rigidity corrugated structure.

[0036] In addition, Figure 3 is a surface enlargement view of the panel in Figure 1, and is a drawing to explain the microscopic wrinkle structure.

[0037] The main material of the prefabricated arch construction panel (100) having a high-rigidity corrugated structure of the present invention (hereinafter referred to as the 'prefabricated arch construction panel') is metal, preferably steel plate, but the technical concept (geometric shape) of the present invention is not limited thereto and can be implemented with various materials capable of achieving sufficient strength, such as high-strength plastic, fiber-reinforced composite material, etc.

[0038] The metal material of the prefabricated arch construction panel (100) having a high-rigidity corrugated structure of the present invention is preferably made of a steel plate coated with hot-dip galvanized steel or hot-dip galvanized magnesium alloy.

[0039] As illustrated in FIGS. 1 and 3, the prefabricated arch construction panel (100) having a high-rigidity corrugated structure of the present invention is pre-curved in the factory through roll forming or press processing to have a predetermined curvature (R) in the longitudinal direction (L). This curvature (R) is determined according to the design of the arch structure to be finally constructed, and when a plurality of panels (100, 100') are assembled sequentially at the site, they form a natural arch tunnel shape.

[0040] The prefabricated arch construction panel having a high-rigidity corrugated structure according to the present invention is a metal panel curved to have a predetermined curvature, and includes a curved body (100) that has a shape curved in the longitudinal direction to form an arch shape when joined together in a plurality, and has a groove (110) formed in the width direction, and the groove (110) structure is defined by a 'pitch (P)' which means the horizontal distance between the peak and valley of the wave, and a 'depth (D)' which means the vertical distance between the peak and valley.

[0041] The above groove (110) is formed as a macroscopic waveform structure having a predetermined pitch and depth, wherein the pitch to depth ratio of the macroscopic waveform structure is within the range of 1.5:1 to 2.0:1.

[0042] When the ratio of pitch to depth of the above macroscopic waveform structure is less than 1.5 (P / D < 1.5), the waveform becomes too narrow and sharp relative to its depth. This causes excessive deformation of the steel plate during roll forming, which lowers productivity, and there is a problem that local buckling is likely to occur in the web section when compressive force is applied.

[0043] Conversely, if the P / D ratio exceeds 2.0 (P / D > 2.0), the waveform becomes too wide and flat relative to its depth. This drastically reduces the moment of inertia, which is an indicator of the cross-sectional bending resistance. Such panels are difficult to form a self-supporting structure and, in particular, cannot support the concrete pouring load (C).

[0044] The present invention maximizes the moment of inertia while ensuring processability by adopting an ‘optimal ratio’ of 1.5 to 2.0.

[0045] The above-mentioned macroscopic corrugated structure is not only curved so that its cross-section forms an arch shape to increase its own rigidity, but also includes a plurality of corrugated structures that are microscopic in the width direction of the groove (110), and the above-mentioned microscopic corrugated structures are formed in a direction substantially perpendicular to the curvature direction of the arch, or are formed in a pattern in which a plurality of corrugations of different lengths intersect to facilitate the formation of curvature of the panel and prevent twisting.

[0046] That is, the curved body (100) of the prefabricated arch construction panel (10) is not only curved so that its cross-section forms an arch shape to increase its own rigidity, but also has a plurality of wavy sections (120) formed as microscopic corrugated structures in the width direction of the groove (110). In addition to reinforcing rigidity, such microscopic corrugated structures perform a very important function of preventing 'twisting' that occurs during arch bending processing. When the panel is bent in the longitudinal direction (L), the inner radius of the curvature is compressed and the outer radius is tensioned. Due to this difference in deformation, the panel is prone to twisting and cannot maintain a flat surface.

[0047] In the present invention, micro-wrinkles may be formed in a pattern in which multiple wrinkles of different lengths intersect (e.g., a herringbone or diamond pattern). This intersecting pattern serves to effectively disperse and absorb compressive and tensile stresses generated during bending processing. Therefore, the panel can be precisely processed according to the designed curvature (R) without warping.

[0048] That is, a pattern in which multiple folds of different lengths intersect can form micro-folds, such as a pattern in which a first fold with a longer length intersects a second fold with a length shorter than that of the first fold.

[0049] In addition, the pitch (P1) of the macroscopic corrugated structure is 550 to 650 mm and the depth (D1) is 300 to 400 mm, and the microscopic corrugated structure is formed as a corrugated shape pattern having a pitch (P2) of 30 mm to 45 mm and a depth (D2) of 5 mm to 8 mm, thereby having the effect of having a second moment of area more than 50 times that of a flat steel plate.

[0050] In addition, the curved body (100) of the prefabricated arch construction panel (10) of the present invention has flange portions (130) formed at both ends to be joined to the sides of adjacent corrugated panels, and the flange portions (130) on both sides are also curved in the opposite direction to the arched curve of the curved body (100) of the corrugated panel to increase the rigidity of the corrugated panel. That is, the flange portions (130) at both ends are curved in the opposite direction to the arched curve of the curved body (100).

[0051] When the valley portion of the macroscopic wave shape in the curved body (100) of the prefabricated arch construction panel (10) faces downward, the flange portion is curved upward. If the flange portion is in the same direction as the wave shape, the worker must insert their hand and tool into the deep valley (D) of the wave shape to fasten the bolt (B), making the work very difficult. By curving in the opposite direction as in the present invention, the joint point where the two flange portions (130) meet protrudes outward, allowing the worker to quickly perform the bolt fastening work in a very comfortable position. This reverse curvature acts as an 'edge stiffener' that reinforces the flange portion itself, preventing deformation of the panel end. Additionally, it is easy to insert sealant or waterproof tape between the two flange portions when fastening the bolt, and since the joint is located on the ridge rather than the valley, it is easy to prevent leakage.

[0052] In addition, the curved body (100) of the prefabricated arch construction panels (10) has a connecting part (140) formed at the longitudinal ends where a wavy shape, which is a microscopic wrinkle structure, is not formed, and a plurality of fastening holes (141) are formed in the connecting part (140).

[0053] As such, the prefabricated arch construction panel (10) having a high-rigidity corrugated structure according to the present invention is curved in a macroscopic corrugated structure in the longitudinal direction and has multiple corrugations formed in a microscopic corrugated structure in the width direction, and the flange portions (130) at both ends are also curved in opposite directions, so that when forming an arch structure, it has sufficient rigidity without a separate supporting structure such as a supporting column.

[0054] In addition, the prefabricated arch construction panel comprises a plurality of prefabricated arch construction panels and a plurality of fastening members for fixing the prefabricated arch construction panels to each other, and may further include a corrosion-resistant coating layer that is electrodeposited after surface treatment using an electrolyte containing baking soda and borax on a surface that has been hot-dip galvanized or hot-dip galvanized with a zinc-magnesium alloy.

[0055] The prefabricated arch construction panel having a high-rigidity corrugated structure according to the present invention can exhibit an independent structural effect of standing on its own without a separate support frame and supporting even concrete pouring loads, but to provide a more corrosion-resistant coating layer, it may further include a corrosion-resistant coating layer applied by electrodeposition after surface treatment using an electrolyte containing baking soda and borax on the plated surface.

[0056] FIG. 4 is a flowchart illustrating a surface treatment method for a steel sheet forming product using an electrolyte containing baking soda and borax according to one embodiment of the technical concept of the present invention.

[0057] Referring to FIG. 4, a surface treatment method for a steel sheet formed product using an electrolyte containing baking soda and borax on the plated surface includes a steel sheet formed product preparation step (S100), a surface modification treatment step using baking soda and borax (S200), an electrolytic corrosion treatment step (S300), a surface treatment step (S400), a washing and coating step (S500), and a drying and curing step (S600).

[0059] 1. Preparation stage for steel sheet formed products (S100)

[0060] The above steel plate forming product preparation step (S100) is a step for preparing a steel plate forming product.

[0061] In the above steel plate forming product preparation step (S100), the steel plate forming product may be a formed product manufactured from a base steel plate. For example, the base steel plate may be a hot-rolled steel plate or a cold-rolled steel plate, and may include carbon steel, alloy steel, or stainless steel.

[0062] A zinc-based plating layer may be formed on the above-mentioned substrate steel sheet. Specifically, the zinc-plated steel sheet (GI) is formed by a hot-dip galvanizing method and has a plating layer with a pure zinc content of 99% or more, the zinc-aluminum alloy plated steel sheet (GL) is composed of a zinc-aluminum alloy (Zn-55%Al-1.6%Si), and the zinc-magnesium alloy plated steel sheet (ZAM) is composed of a zinc-aluminum-magnesium alloy (Zn-6%Al-3%Mg).

[0064] 2. Surface modification treatment step using baking soda and borax (S200)

[0065] The surface modification treatment step (S200) using baking soda and borax is a step of surface modification treatment by immersing the steel plate forming product in a surface treatment composition electrolyte.

[0066] That is, the surface modification treatment step (S200) using baking soda and borax may be a step of electrochemically modifying the surface of the steel sheet forming product using a surface treatment composition electrolyte to impart roughness, and the surface treatment composition electrolyte can be prepared by dissolving baking soda (NaHCO3) and borax (Na2B4O7·10H2O) in water.

[0067] Specifically, the above surface treatment composition electrolyte may be prepared by mixing 2 to 15 parts by weight of baking soda and 0.5 to 8 parts by weight of borax with respect to 100 parts by weight of total water content for optimal performance.

[0068] Preferably, in order to optimize the mixing ratio of the electrolyte of the surface treatment composition, the surface roughness and uniformity according to the weight ratio of baking soda and borax were evaluated, and it was confirmed that the baking soda and borax showed excellent effects in a weight range of 1.5:1 to 4:1.

[0069] When the process conditions of the above surface treatment composition electrolyte are as follows, actual values ​​of Ra 4.11㎛ and Rz 23.56㎛ can be obtained at a weight ratio of 2:1 (40g baking soda, 20g borax / 1.5L) for the baking soda and borax.

[0070] Process conditions:

[0071] · Electrolyte temperature: 20℃ to 85℃ (Optimal: 70℃)

[0072] · Applied voltage: DC 15V to 30V (Optimal: 20V)

[0073] · Processing time: 30 to 180 seconds (Optimal: 60 seconds)

[0074] · Current density: 10 to 50 mA / cm² 2

[0076] 3. Electrolytic corrosion treatment step (S300)

[0077] The above electrolytic corrosion treatment step (S300) is a step of connecting a steel sheet formed product, which has been surface-modified by immersing it in the surface treatment composition electrolyte, to the positive electrode (+) and connecting a corrosion-resistant electrode to the negative electrode (-) to complete the electrolytic corrosion treatment, and then removing the electrolyte components remaining on the surface through a washing process.

[0078] For example, in the zirconium compound coating step (S300), the corrosion-resistant electrode connected to the cathode (-) may be one or more corrosion-resistant electrodes selected from lead (Pb), copper (Cu), graphite, or stainless steel.

[0080] 4. Surface treatment step (S400)

[0081] The above surface treatment step (S400) is a step of surface treating the electrolytically etched steel sheet formed product using a surface treatment composition.

[0082] In the above surface treatment step (S400), the surface treatment composition may be a solution containing a zirconium compound, wherein the solution containing the zirconium compound is prepared by including 0.5 to 3.0 g / L of hexafluorotitanoic acid, 1.0 to 5.0 g / L of hexafluorozirconic acid, 0.1 to 2.0 g / L of aminomethyl-substituted polyvinylphenol, and the remainder of water, and is formed into a colored coated metal plate that exhibits sufficient color development and excellent processability, while preventing discoloration or fading of the colored coating film over time due to light irradiation.

[0083] The above-mentioned molten zinc-plated steel sheet formed product is immersed in a zirconium compound solution to form a coating film, and the heat treatment of the coating film may be carried out at a temperature of 100°C or higher.

[0085] 5. Washing and coating step (S500)

[0086] The washing and coating step (S500) is a step of washing the surface-treated steel sheet formed product and then performing a resin coating.

[0087] In the above washing and coating step (S500), the resin coating is intended to provide excellent corrosion resistance, weather resistance, and a beautiful appearance, and one or more of the following methods may be selectively applied.

[0088] (1) Electroplating applied alone

[0089] The above electrodeposition coating is a method of uniformly coating the workpiece by immersing it in an electrodeposition paint to the interior, and is performed to improve the adhesion between the steel sheet formed product and the subsequent general coating layer.

[0090] The above-mentioned electrodeposition coating is a process performed to form a thick resin coating layer on a galvanized steel sheet formed product and to improve the adhesion between the hot-dip galvanized steel sheet formed product and a second general coating resin coating layer, and is a coating method widely used as a primer for metal substrates.

[0091] The above electrodeposition coating is a method of uniformly coating not only the exterior but also the interior of an object to be coated by immersing it in an electrodeposition paint. Specifically, it is a coating method in which a molten zinc-plated steel sheet formed product is immersed in a tank containing the electrodeposition paint, and then a voltage is applied between the molten zinc-plated steel sheet formed product and an electrode to form an electrodeposition coating layer on the surface of the molten zinc-plated steel sheet formed product.

[0092] In the above electrodeposition coating process, both cationic and anionic paints can be used as electrodeposition paints. Epoxy-based paints with excellent corrosion resistance are mainly used as primers for metals, but acrylic-based paints can also be applied to products requiring weather resistance and a beautiful appearance.

[0094] In addition, the above epoxy-based electrodeposition paint may be used by being composed of 10 to 20 vol% titanium dioxide, 10 to 20% 2-butoxyethanol, 5 to 10% kaolin, 1 to 5% dibutyl tin oxide, 1 to 5% Poly[oxy(methyl-1,2-ethanediyl)], α-(methylphenyl)-ω-hydroxy, 0.1 to 1% hexone, 0.1 to 1% trimethylolpropane, 0.1 to 1% carbon black, and as binders, 1 to 5% bis(2-(2-butoxyethoxy)ethoxy)methane, 1 to 5% 4,4'-Isopropylidenediphenol, and 0.1% or less of a mixture of 2-methyl-3(2H)-isothiazolone and 5-chloro-2-methyl-3(2H)-isothiazolone.

[0096] In the present invention, the electrodeposition coating conditions are as follows.

[0097] · Coating temperature: 150℃ to 300℃ (preferably, 200℃ to 250℃)

[0098] · Electrodeposition voltage: DC 200V to 400V

[0099] · Immersion time: 2 to 5 minutes

[0100] · Film thickness: 0.1mm to 0.4mm (preferably, 0.1mm to 0.2mm)

[0101] If the formation temperature of the first electrodeposition resin coating layer is less than 150°C, the first electrodeposition resin coating layer is not sufficiently melted, so a uniform electrodeposition resin coating layer cannot be formed on the surface of the steel plate, and if it exceeds 300°C, the resin coating layer may decompose thermally, and the adhesive strength may be significantly reduced.

[0103] (2) General coating multilayer structure after electrodeposition coating

[0104] The above-described multilayer structure of general coating following electrodeposition coating is a process of recoating a steel sheet formed product coated with the electrodeposition resin using a conventional general coating process. All types of resins, such as acrylic, urethane, and epoxy resins, can be used, and various colors can be realized depending on the intended use. In this case, by forming a multilayer coating layer of electrodeposition coating and general coating, enhanced durability and appearance quality can be secured.

[0105] The above general painting process is a second general painting resin coating process, which is a process of recoating the substrate steel plate coated with the first electrodeposition paint resin using a conventional general painting process.

[0106] The composition used in the second general resin coating process allows for the use of all types of resins, such as acrylic, urethane, and epoxy resins, and also enables the realization of various colors depending on the application.

[0108] (3) General paint only

[0109] Depending on the specific application, it is also possible to directly apply only general coating without electrodeposition. In this case, the required performance can be secured through an economical and simple process.

[0111] 6. Drying and curing step (S600)

[0112] The above drying and curing step (S600) is a step of passing the resin-coated steel sheet forming product through a drying oven to cure the coating film and completely adhere it to the zinc plating layer.

[0113] In the above drying and curing step (S600), the heating temperature of the drying oven can be performed in the range of 150 to 250°C depending on the type of paint used, and after the curing process, cooling can be performed using air cooling or water cooling.

[0115] Hereinafter, with reference to the attached drawings, an example of a surface treatment method for a steel sheet formed product using an electrolyte containing baking soda and borax according to one embodiment of the technical concept of the present invention will be described in more detail.

[0117] < Examples >

[0118] First, a galvanized steel (GI) specimen was prepared.

[0119] Next, an electrolyte was prepared by dissolving 40g (2.67 wt%) of baking soda (NaHCO3) and 20g (1.33 wt%) of borax (Na2B4O7·10H2O) in 1.5L of water. At this time, the weight ratio of baking soda to borax is 2:1.

[0120] Next, the electrolyte temperature was maintained at room temperature (25±2℃), and a DC 20V voltage was applied for 60 seconds with the specimen as the anode and the copper electrode as the cathode to perform surface modification treatment.

[0121] Next, after surface modification treatment, the specimen was washed with distilled water and dried, then immersed in a zirconium compound solution (hexafluorotitanoic acid 2.0 g / L, hexafluorozirconium acid 3.0 g / L, aminomethyl-substituted polyvinylphenol 1.0 g / L) to perform a coating treatment, and then heat-treated at 100°C for 10 minutes.

[0123] < Comparative Example >

[0124] The same galvanized steel sheet specimen as in Example 1 was used, but the electrolyte was prepared by dissolving only 30g (2.0 wt%) of baking soda (NaHCO3) in 1.5L of water, excluding borax. It was treated under the same conditions (DC 15V, 60 seconds), but no zirconium coating treatment was performed.

[0126] < Measurement of physical properties >

[0127] The physical properties of the specimens according to the above examples and comparative examples were measured.

[0129] 1. Surface roughness measurement

[0130] The surface roughness of the specimen according to the example was measured according to the KS B ISO 4287:1997 method.

[0131] As a result of measuring the surface roughness of the specimen according to the example, the centerline average roughness (Ra) was measured to be 4.11 μm and the maximum height roughness (Rz) was measured to be 23.56 μm.

[0132] In contrast, when the surface roughness of the specimen according to the comparative example was measured, the average roughness (Ra) was measured to be 1.12 μm and the maximum height roughness (Rz) was measured to be 9.02 μm.

[0133] The results of tissue imaging showed a relatively smooth surface compared to the sample treated with the mixed electrolyte.

[0134] From the results of the above examples and comparative examples, it can be confirmed that the surface roughness is significantly increased by using a mixed electrolyte solution in which borax is added to baking soda. In addition, by adding a zirconium coating treatment, the effect of further improving paint adhesion and corrosion resistance can be obtained.

[0136] 2. Test Report

[0137] FIGS. 5a to 5e are test reports measuring the physical properties of specimens prepared according to the examples.

[0139] Referring to FIGS. 5a to 5e, the specimen prepared according to the example has a [BK-1] surface roughness (test method: KS B ISO 4287:1997) (㎛) of 1.12 Ra and 9.02 Rz, and a [BKBS-1] surface roughness (test method: KS B ISO 4287:1997) (㎛) of 4.11 Ra and 23.56 Rz, and it can be confirmed that the upper and cross-sectional structures are uniform.

[0141] 3. Comparative Analysis of Surface Roughness

[0142] Figure 6 is a graph comparing the surface roughness measurement results of specimens according to the example and comparative example.

[0144] Referring to Fig. 6, when treated with a mixed electrolyte of baking soda and borax as in the example, the surface roughness increased significantly, for example, Ra improved by 267% (1.12㎛ → 4.11㎛) and Rz improved by 161% (9.02㎛ → 23.56㎛).

[0145] Through this, uniformity can be expected to be secured by maximizing the physical bonding area with the coating layer.

[0147] Baking soda creates a slightly alkaline environment (pH 8.3) to prevent excessive corrosion of the zinc plating layer and maintain the stability of the overall reaction. At the same time, HCO3 - OH ions generated at the anode - reacts with CO3 2- Forms, and Zn 2+ It reacts with to precipitate insoluble ZnCO3·Zn(OH)2, forming a porous nanostructure.

[0148] Borax inhibits local pH changes through buffering action, and B4O7 2- The ion forms a coordination bond with the zinc ion to produce a zinc-borate complex (2ZnO·3B2O3·7H2O). This complex induces preferential growth of a specific crystal plane (0001) of zinc, forming a uniform surface of a hexagonal plate-like nanostructure.

[0149] The role of zirconium coating treatment: Zirconium compound coating treatment forms a chemically stable zirconium compound layer on the fine uneven structure formed after surface modification treatment.

[0150] This film layer enhances the chemical activity of the surface to strengthen the chemical bonding with the subsequent coating layer and improves corrosion resistance to ensure long-term durability. It also acts as an intermediate layer before painting to contribute to improved adhesion and has the effect of preventing discoloration and fading of the colored film over time caused by light irradiation.

[0152] As described above, the present invention provides an eco-friendly and economical surface treatment method that can secure significantly improved surface characteristics and paint adhesion compared to conventional technology by combining surface modification treatment using a mixed electrolyte of baking soda and borax with zirconium coating treatment.

[0154] In addition, the present invention provides a method for constructing a construction structure using a prefabricated arch construction panel having a high-rigidity corrugated structure.

[0155] This method comprises: (a) a step of providing the panels; (b) a step of connecting the panels sequentially to form a self-supporting arch structure without an internal support frame; and (c) a step of pouring concrete on top of the self-supporting arch structure to form a protective layer.

[0156] At this time, the panel serves as formwork during concrete pouring, and at the same time functions as a tensile reinforcement and spall liner after the concrete is cured.

[0158] In the present invention, the step of (a) providing the panels of a construction structure using a prefabricated arch construction panel having a high-rigidity corrugated structure is to produce a finished prefabricated arch construction panel (10) that is pre-curved in the longitudinal direction (L) in advance at a factory through roll forming or press processing, and then has a corrosion-resistant coating layer applied after surface treatment using an electrolyte containing baking soda and borax on the surface of the panel, and then transport it to the construction site.

[0159] (b) In the step of forming a self-supporting arch structure, prefabricated arch construction panels (10, 10') are assembled sequentially using equipment such as a crane on a foundation (F) that has been pre-constructed at the site. The flange portions (130) of the panels are fastened with bolts (B) from the foundations (F) on both sides toward the center, and the panels are assembled into an arch shape.

[0160] The key feature of the construction method of the present invention is that, during the assembly process, no temporary support (scaffolding) or separate support frame (H-beam, etc.) is required inside the arch structure (S), which is made possible solely by the “high-rigidity corrugated structure,” and as soon as the panel is assembled, it supports its own weight and forms a self-supporting structure (S).

[0161] (c) The protective layer formation step (concrete pouring) is formed by directly pouring concrete (C) onto the upper (exterior) part of the fully self-supporting steel arch structure (S), after placing a mesh as needed.

[0162] At this time, the prefabricated arch construction panel (10) of the present invention simultaneously performs three key composite functions. Formwork function: Due to its own ultra-high rigidity, the prefabricated arch construction panel (10) perfectly supports the massive weight and lateral pressure of unhardened wet concrete (C) without the need for separate supports. Additionally, the tension reinforcement function: after the concrete (C) is cured and hardened, the prefabricated arch construction panel (10) becomes permanently integrated with the concrete and functions as a 'tension reinforcement' (acting as rebar) to reinforce the concrete's weak tensile strength.

[0163] The spall liner function is such that the prefabricated arch construction panel (10) becomes the finished interior (I) surface of the structure. In the event of an explosion or impact inside, the prefabricated arch construction panel (10) acts as a 'spall liner' to prevent the scattering of concrete fragments, thereby maximizing the protective performance and internal stability of the structure.

[0165] In addition, the construction method for a construction structure using a prefabricated arch construction panel having a high-rigidity corrugated structure according to the present invention is applied in various forms depending on the required protection grade or usage environment at the site.

[0166] First, the prefabricated arch construction panel having a high-rigidity corrugated structure according to the present invention can be used alone, and a self-supporting arch (lightweight warehouse, shelter, etc.) is constructed solely by the rigidity of the panel itself.

[0167] Second, there is a case where the prefabricated arch construction panel having the high-rigidity corrugated structure of the present invention and concrete are used, and there is a composite structure (HAS hangar, etc.) described above.

[0168] Thirdly, there are underground structures (ammunition depots, igloos, culverts, 'cut-and-cover tunnels', etc.) that are completed by covering the self-supporting arch panel with soil (earth) on top of the prefabricated arch construction panel having a high-rigidity corrugated structure according to the present invention.

[0169] Fourth, it can also be used to maximize protective performance by covering the top of a composite structure using the above concrete with soil.

[0171] The present invention is not limited to the specific preferred embodiments described above, and any person skilled in the art to which the invention pertains can make various modifications without departing from the essence of the invention as claimed in the claims, and such modifications will be within the scope of the claims. Explanation of the symbols

[0173] 10 : Prefabricated arch construction panel 100 : Curved body 110 : Groove 120 : Waveform section 130 : Flange section 140 : Connection section

Claims

Claim 1 A plurality of prefabricated arch construction panels made of metal or composite material, curved to have a predetermined curvature, are curved in the longitudinal direction to form an arch shape when joined together, and the cross-section of the prefabricated arch construction panel is formed with a macroscopic corrugated structure having a predetermined pitch (P1) and depth (D1), and the ratio of pitch (P1) to depth (D1) of the macroscopic corrugated structure is within the range of 1.5:1 to 2.0:1, and flange portions are formed at both ends of the prefabricated arch construction panel to join with the side of an adjacent prefabricated arch construction panel, and the flange portions on both sides are curved in the opposite direction to the macroscopic corrugated structure, and the prefabricated arch construction panel includes a plurality of prefabricated arch construction panels and a plurality of fastening members that fix the prefabricated arch construction panels to each other, and further includes a corrosion-resistant coating layer that is electrodeposited after surface treatment using an electrolyte containing baking soda and borax on a surface plated with hot-dip galvanizing or hot-dip galvanizing magnesium alloy, and the electrolyte containing baking soda and borax The surface treatment method comprises: a preparation step (S100) of prefabricated arch construction panels and fastening members plated with hot-dip galvanizing or hot-dip galvanizing-magnesium-ion alloy; a surface modification treatment step (S200) using baking soda and borax, wherein the prefabricated arch construction panels and fastening members plated with hot-dip galvanizing or hot-dip galvanizing-magnesium-ion alloy are immersed in a surface treatment composition electrolyte to perform surface modification treatment; an electrolytic corrosion treatment step (S300) wherein the prefabricated arch construction panels and fastening members plated with hot-dip galvanizing or hot-dip galvanizing-magnesium-ion alloy, which have been surface modified by immersing them in the surface treatment composition electrolyte, are connected to an anode (+) and a corrosion-resistant electrode is connected to a cathode (-) to complete electrolytic corrosion treatment, and then a washing process is performed to remove residual electrolyte components from the surface; and a surface treatment step (S400) wherein the prefabricated arch construction panels and fastening members plated with hot-dip galvanizing or hot-dip galvanizing-magnesium-ion alloy, which have undergone electrolytic corrosion treatment, are surface treated using a surface treatment composition.A prefabricated arch construction panel having a high-rigidity corrugated structure, comprising: a washing and coating step (S500) in which a resin coating is performed after washing the surface-treated hot-dip galvanized or hot-dip galvanized zinc-magnesium alloy plated prefabricated arch construction panel and fastening member; and a drying and curing step (S600) in which the resin-coated hot-dip galvanized or hot-dip galvanized zinc-magnesium alloy plated prefabricated arch construction panel and fastening member are passed through a drying oven to cure the coating film and completely adhere to the zinc plating layer, wherein in the surface modification treatment step (S200) using baking soda and borax, the surface treatment composition electrolyte is prepared by mixing 2 to 15 parts by weight of baking soda and 0.5 to 8 parts by weight of borax with respect to 100 parts by weight of total water content. Claim 2 The prefabricated arch construction panel according to claim 1 further comprises a curved body including a micro-fold structure formed in a direction intersecting the arch curvature direction, wherein the micro-fold structure of the curved body is formed in a direction intersecting the arch curvature direction or in a pattern in which a plurality of folds of different lengths intersect, in order to facilitate the formation of the arch curvature of the panel and prevent twisting. Claim 3 A method for constructing a construction structure using a prefabricated arch construction panel according to claim 1 or 2, characterized by comprising the steps of: (a) providing a plurality of prefabricated arch construction panels; and (b) sequentially connecting the prefabricated arch construction panels to form a self-supporting arch structure without an internal support frame. Claim 4 delete Claim 5 delete

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