KR20220114200A - Manufacturing method for corrugated steel pipe withmulti-coated layer - Google Patents

Abstract

An objective of the present invention is to provide a method for manufacturing a flange-type coated corrugated steel pipe, in which a plurality of resin coating layers are formed on the inner and outer surfaces of a corrugated steel pipe after the corrugated steel pipe is welded to a flange, and a coated corrugated steel pipe manufactured thereby. The method for manufacturing a flange-type coated corrugated steel pipe comprises: a step (S10) of manufacturing a main body of a corrugated steel pipe by slantly inserting a steel plate into a forming unit and a pipe assembling unit; a primary welding step (S20, S30) of inserting the body of the corrugated steel pipe into a flange to temporarily joining the body of the corrugated steel pipe and the flange; a secondary welding step (S40, S50) of completely joining the body of the corrugated steel pipe and the flange after pressing the body of the corrugated steel pipe to the flange by an expansion process; a step (S60) of preheating the flange-type corrugated steel pipe manufactured through the welding steps; a step (S70) of coating the heated flange-type corrugated steel pipe with adhesive resin in a first resin coating device; a step (S80) of recoating the coated flange-type corrugated steel pipe with general resin in a second resin coating device; and a step (S90, S100) of reheating the recoated flange-type corrugated steel pipe and cooling the flange-type corrugated steel pipe in the air.

Description

Manufacturing method of flanged coated corrugated steel pipe {MANUFACTURING METHOD FOR CORRUGATED STEEL PIPE WITHMULTI-COATED LAYER}

An object of the present invention is to manufacture a flange-type coated corrugated steel pipe that can efficiently and mass produce a flange-type coated corrugated steel pipe in which multiple resin coating layers are formed on the inner and outer surfaces of the corrugated steel pipe after welding the flange to the corrugated steel pipe Another object of the present invention is to coat an adhesive resin containing no colorant on the body surface of a galvanized corrugated steel pipe, and to contain a colorant on the surface of the adhesive resin layer. By coating the resin, it is possible to prevent peeling of the resin in advance when it is buried in the ground and treats various sewage and sewage, and has excellent durability, corrosion resistance and abrasion resistance, and is very economical flange-type coating because it can be mass-produced. It is intended to provide a corrugated steel pipe.

The present invention relates to a method for manufacturing a flange-type clad corrugated steel pipe and a corrugated corrugated steel pipe by the method, in particular, treating sewage, wastewater, and sewage by coating multiple resin layers on the inner and outer peripheral surfaces of a corrugated steel pipe. The present invention relates to a method for manufacturing a flange-type coated corrugated steel pipe which minimizes peeling of the coated resin layer when used for this purpose, and has flanges at both ends to provide excellent bondability and workability, and to a coated corrugated steel pipe thereby.

In general, a corrugated steel pipe is a member widely used as a drainage channel of sewage/waste water in the civil engineering field, a water supply channel for living or industrial water, or a hollow formwork or a building suit in the construction field. In particular, corrugated steel pipe is an alternative material to the existing concrete drainage pipe due to the increasing awareness of the manpower shortage, cost, and environmental problems in the construction field. It provides structural stability, durability, economy, assembly and productivity, and can be manufactured in a desired diameter and length. Typically, such a corrugated steel pipe is an annular band ( annularband) is used. The annular band is a return-type band, and by fastening the extended ends fixedly formed at or near the end with stud bolts and nuts, respectively, the main bodies of the corrugated steel pipe are connected.

However, the conventional coated steel pipe takes a pipe joint method by an annular band, so that when the axial directions between the main bodies do not coincide with each other, a poor coupling state is maintained, or it takes a lot of time to pipe the main bodies, There is a disadvantage of providing an inefficient piping work environment. In addition, since the conventional coated steel pipe uses an annular band, it is difficult to maintain watertightness when internal pressure is generated compared to the flange method, and since the bonding force between the steel pipes is relatively weak, the bonding portion Therefore, in recent years, prototypes of corrugated steel pipes with flanges attached to both ends have been developed, but these are manufactured by manually welding and attaching a flange to the outer diameter of a body having a large diameter. Therefore, due to the absence of facilities for mass production, the manufacturing cost is very high, and there is a problem in that it is not possible to mass-produce a double-coated high-quality product.

In particular, since the conventional corrugated steel pipe is attached by welding the flange to the body, corrosion easily occurs at the welded portion, which is a very big problem due to the characteristics of the corrugated steel pipe used for construction or civil engineering. In the past, products of coated steel pipe coated with corrugated steel pipe were shipped one after another as steel pipe products, but this

Since a resin of a material different from a metal is coated on the plating surface to form a layer, in the case of a coated steel pipe after a predetermined use time has elapsed, the resin layer is separated from the steel pipe or peeled off. In particular, in the conventional Because the coated corrugated steel pipe has a spiral surface shape bent by multiple threads or threads, it is difficult to form a resin layer of uniform thickness on the outer peripheral surface, or the coating operation is very cumbersome and mass production is difficult, so the manufacturing cost is relatively low. It has a disadvantage of being expensive. Considering the disadvantages of the prior art, it is urgent to develop a manufacturing method for mass production in terms of price and productivity.

An object of the present invention is to manufacture a flange-type coated corrugated steel pipe that can efficiently and mass produce a flange-type coated corrugated steel pipe in which multiple resin coating layers are formed on the inner and outer surfaces of the corrugated steel pipe after welding the flange to the corrugated steel pipe Another object of the present invention is to coat an adhesive resin containing no colorant on the body surface of a galvanized corrugated steel pipe, and to contain a colorant on the surface of the adhesive resin layer. By coating the resin, it is possible to prevent peeling of the resin in advance when it is buried in the ground and treats various sewage and sewage, and has excellent durability, corrosion resistance and abrasion resistance, and is very economical flange-type coating because it can be mass-produced. It is intended to provide a corrugated steel pipe.

An object of the present invention is to prepare a body of a corrugated steel pipe by inserting a steel plate into a forming unit and a pipe making unit obliquely, and inserting the body of the corrugated steel pipe into a flange, respectively, to temporarily join the body and the flange of the corrugated steel pipe. After attaching the body of the corrugated steel pipe to the flange by the pipe expansion process, the second welding step of completely joining the body and the flange of the corrugated steel pipe, and preheating the flanged corrugated steel pipe manufactured through the welding steps and the heated flange type coating the corrugated steel pipe with an adhesive resin in a first resin coating device; Re-coating the coated flange-type corrugated steel pipe with a general resin in a second resin coating device; This is achieved by a method for manufacturing a flange-type coated corrugated steel pipe, comprising reheating the re-coated flanged corrugated steel pipe and cooling it in air.

In addition, another object of the present invention is to provide a corrugated steel pipe with a flange assembly tack welding device, a flange auto welding device, a pre-heating device, a first resin coating device, a second resin coating device, a post heating device and a cooling device. In a flange-type coated corrugated steel pipe manufactured by sequentially passing through, it is a zinc steel strip for a corrugated steel pipe, and a base portion having an ultra-thick plating layer and a surface of the flange are double coated with resin layers to have an integrated double coating structure. It is achieved by topographic coated corrugated steel pipe.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings, FIG. 1 is a flowchart illustrating a method for manufacturing a flange-type coated corrugated steel pipe according to the present invention, and FIGS. 2 and 3 are flange-type according to the present invention. It is a perspective view for explaining the process of manufacturing the body of the corrugated steel pipe in the manufacturing method of the coated corrugated steel pipe. In addition, FIG. 4 is a plan view for explaining the manufacturing facility of the flange-type coated corrugated steel pipe used in the present invention, and FIG. 5 is a cross-sectional view for explaining the arrangement relationship of the manufacturing facility shown in FIG. 4 . 6A and 6B are a perspective view and an enlarged cross-sectional view for explaining a flange-type coated corrugated steel pipe manufactured by the manufacturing method of the flange-type coated corrugated steel pipe shown in FIG. 1. First, as shown in FIG. The manufacturing method of the flange-type coated corrugated steel pipe according to the present invention is largely divided into a forming unit and a tube forming unit.

It starts by manufacturing the body of the corrugated steel pipe (S10). Thereafter, in the manufacturing method of the present invention, the body of the manufactured corrugated steel pipe is inserted into the flange, respectively (S20), and 1 for temporary joining of the body and the flange of the corrugated steel pipe is performed. Secondary welding is performed (S30), and the body and flange of the corrugated steel pipe are brought into close contact through the pipe expansion process (S40), and secondary welding is performed for complete bonding of the body and flange of the corrugated steel pipe (S50), flange type Produce corrugated steel pipe. The flange-type corrugated steel pipe manufactured in this way is pre-heated for resin coating (S60), firstly coated with an adhesive resin in the first resin coating device (S70), and secondly re-coated with general resin in the second resin coating device (S80), undergoes a post-processing process by reheating (S90), and is cooled in air to become a finished product (S100)

The manufacturing method of the flange-type coated corrugated steel pipe of the present invention described above proceeds with a manufacturing facility for the flange-type clad corrugated steel pipe, which will be described in detail below.

As shown in FIG. 2, in the body manufacturing step (S10) of the corrugated steel pipe, the forming unit 12 transports the hot-dip galvanized steel sheet (10: strip) wound to a constant length to the roller-type die 13 at an angle, A wave formed of mountains and valleys is formed on the steel plate 10 . The steel sheet 10 having such a corrugation has a spiral strip shape while passing through the guide roller 14 and the forming roller 15 . At this time, in the forming unit 12, the spiral strip-shaped steel sheet contact portion is welded by a welding device (not shown), or when passing through the forming roller 15, both sides of the steel sheet 10 are folded and pressed to overlap each other. By doing so, having a constant diameter

The spiral pipe 3 is made. As shown in Fig. 3, the spiral pipe 3 passes through the re-bending process of a pipe making unit (not shown), and forms a spiral-shaped mountain and valley in the center of the body 32, and The end 31 has straight peaks and valleys, and after being cut to a certain length (approximately 6 m), it is manufactured as a body 30 of a hot-dip galvanized corrugated steel pipe having a basic structure through a finishing process such as painting a sealing material. . The body 30 of the corrugated steel pipe manufactured in this way is stacked and stored in the loading area before being transferred to the flange mounting and coating steps. After transporting the stacked corrugated steel pipe body to the flange-type coated corrugated steel pipe manufacturing facility, it is positioned on the first rail 901. Then, the corrugated steel pipe body is inserted into the flange, respectively, and 1 for provisional joining is performed. Secondary welding, adhesion of the body and flange of the corrugated steel pipe, secondary welding for complete joining, and multi-coating coating and cooling processes (S20 ~ S100) are available for flange assembly installed in the installation space of the ground or underground (10) A welding device 100, a flange auto welding device 200, a pre-heating device 300, a first resin coating device 400, a second resin coating device 500, and high-pressure air are resin coated A high-pressure blower 450 for pressurizing the inside of the devices 400 and 500, a post-heating device 600, a cooling device 700, and from the flange mounting operation to the flange-attached corrugated steel pipe cooling operation. It is implemented by the manufacturing facility of the flange-type clad corrugated steel pipe consisting of a centralized PLC control panel 800 that performs the overall management and control process, the rail system 900, and basic facilities that transmit power to each device. .

In particular, the rail system 900 is a pair of standard corrugated steel pipe standards, for example, with a spacing set based on a 6 m long corrugated steel pipe, and a plurality of rails 901 to 910 installed between devices in the longitudinal direction. Consists of lifting means (921 ~ 925).

The rail system 900 gradually decreases in height from the starting point (left side of the drawing) to the end point (right side of the drawing). Accordingly, the body of the corrugated steel pipe can naturally roll down by its own weight.

Below, when describing a plurality of devices 100 to 800 sequentially arranged along the rail system 900 described above, since the upper and lower portions of FIG. 4 are approximately symmetrical, one of the First, the flange assembly tack welding apparatus 100 has two flange fixing roller shafts 101 and 102 fixed vertically to the upper plate of the transfer bed 103 , and a welding gun 105 . A tag welding machine 104 is provided. In particular, the roller shafts 101 and 102 are each formed with seating slits for mounting flanges on the circumferential surface of the rollers. It is fitted into the seating slit 107 of (101, 102).

In addition, the first lifting means 921 and 922 disposed on the inside of the flange assembly tack welding apparatus 100 are hook-type actuating arms that are hinged in the upper and lower circumferential directions by hydraulic struts, respectively. These first lifting means (921, 922) is a corrugated steel pipe at the shaft center of the flange.

The hinge operation is repeatedly performed while supporting the body of the corrugated steel pipe separately so that the axial center of the body is aligned and the body of the corrugated steel pipe is moved toward the flange. In this case, the end of the body of the corrugated steel pipe is adjusted to be inserted into the inner diameter of the flange, and at this time, the operator uses the welding gun 105 of the tag welding machine 104 to tag-weld the insertion part to temporarily attach the flange to the body of the corrugated steel pipe. The body of the corrugated steel pipe to which the flange is temporarily joined in this way moves toward the inclined second rail 902 as the right hook-type actuating arm 921 of the first elevating means hinges upward. , rolls along the second rail 902 and moves to the third rail 903 installed near the flange auto welding device 200 .

In the present invention, the guide operation shaft (201, 202, 301, 302, 401, 402, 601, 602, 701, 702) of the steel pipe feeding system (210, 310, 410, 510, 610, 710) is a roller in a vertical state. When rotating, since the height of the end of the roller is higher than the height of each rail 901 to 910, the body of the corrugated steel pipe together with the rotating roller can freely rotate on the upper part of the rails 901 to 910. Flange Auto The welding device 200 is an apparatus for welding the corrugated steel pipe body to which the flange is temporarily joined, by placing the body of the corrugated steel pipe on the third rail 903, and then welding the contact surface between the flange and the corrugated steel pipe body through a pipe expansion process. This flange auto welding apparatus 200 includes a first steel pipe feeding system 210, a tower-type frame 220, and an auto welding machine 230. The first steel pipe feeding feeding system 210 includes two pipes arranged at a predetermined interval. A chain power transmission mechanism using an electric motor to hinge the first and second guide actuating shafts 201 and 202 of the

has For example, the basic state is when the first and second guide operating shafts 201 and 202 are hinged in opposite directions to become horizontal.

Thereafter, when the second guide operating shaft 202 operates vertically while the first guide operating shaft 201 is horizontal, the body of the rolling corrugated steel pipe is the third rail near the flange auto welding device 200 . Stopped at 903. After that, when the first guide actuating shaft 201 becomes vertical again, the body of the corrugated steel pipe is spaced apart from the third rail 903, and is rotatable by the rollers of the respective guide actuating shafts 201 and 202. do.

On the other hand, the tower-type frame 220 is provided with an elevator device using an electric reduction motor, a pulley, a chain, and a vertical rail on the upper portion, and a compression rotation mechanism for lifting and lowering by the elevator device. The compression rotation mechanism is the main body of the aforementioned tube expansion process, and includes a first compression roller positioned below and rotating by a hydraulic motor, and a second compression roller positioned above and movable in the up and down directions by a hydraulic actuator. do. By the operation of these first and second compression rollers, the tentatively joined flange and the end of the body of the corrugated steel pipe rotate on the rollers of the guide operation shafts 201 and 202 described above while closely contacting each other. The welding gun of the auto welding machine 230 is fixed near the crimp rotation mechanism by the support so that the welding rod is located on the contact line of the corrugated steel pipe. Since the auto welding machine 230 performs welding while the joined flange and the corrugated steel pipe rotate, the contact line between the corrugated steel pipe and the flange is completely joined, thereby completing a basic flanged corrugated steel pipe. Thereafter, the flanged corrugated steel pipe is moved to the following coating process. For example, in the coating process, among the first and second guide operating shafts 201 and 202, which are vertical, the second guide operating shaft 202 is horizontal. At the same time as the furnace hinge operation, when the first guide actuating shaft 202 moves slightly to the right, the flanged corrugated steel pipe rolls along the inclined third rail 903 and fourth rail 904, and the second lifting means It arrives at 923. The second lifting means 923 is a hook-type actuating arm hinged in the upper and lower circumferential directions by hydraulic struts, and is similar to the above-mentioned first lifting means, and is a flange-type corrugated steel pipe. The pre-heating device 300 on the fifth rail 905 side stops and rotates the rolled down steel pipe by taking the same form as the above-mentioned steel pipe input and transport system. , a second steel pipe input/transfer system 310 for transporting, a heating unit 320 that is connected to a pipeline from an external gas supply source and burns the supplied gas to generate a flame in the burner nozzle, and a flange-type corrugated steel pipe It consists of a contact sensor unit 311 for position control.

The second steel pipe feeding system 310 rotates the flange-type corrugated steel pipe with the rollers of the guide operation shafts 301 and 302 . And, the heating unit 320 generates a flame by arranging a plurality of burner nozzles in a line. Accordingly, the flange-type corrugated steel pipe and the entire flange are evenly heated. The first resin coating device 400 is configured to coat the inner and outer surfaces of the heated flange-type corrugated steel pipe with an adhesive resin, so that the third steel pipe is fed in and moved up and down. A rotation system 410 is provided. The third steel pipe input transfer and elevating and lowering rotation system 410 is a rectangular first

Pulley-type elevating means 924 coupled to both side ends of the resin powder box 420, and each coupled to these elevating means 924 to rotate hydraulic rollers, and hinged operation in different directions respectively It consists of shafts 401 and 402 .

In particular, the first resin coating device 400 further includes a high-pressure blower 450, and is configured to pressurize high-pressure air to the lower chamber 454 of the first resin powder box 420 through the duct 451. . When viewed from the side, the first resin powder box 420 has an upper chamber 453 filled with an adhesive resin, a diaphragm 452 having a plurality of minute holes, and a lower chamber 454 penetrating the duct 451 . ), and by injecting the supplied high-pressure air into the upper chamber 453 through the holes of the diaphragm 452 , the adhesive resin powder is blown into the air of the upper chamber 453 during the resin coating operation. In addition, after the pulley-type elevating means 924 of the third steel pipe feed and elevating and lowering rotation system 410 descends to the upper chamber 453 of the first resin powder box 420, hydraulic rollers 401 and 402 By rotating, as a result, the heated flange-type corrugated steel pipe rotates inside the upper chamber 453 . At this time, the adhesive resin is evenly adhered to all surfaces of the heated flange-type corrugated steel pipe to be coated.

After that, the third steel pipe feed and elevating rotation system 410 raises and lowers the pulley-type elevating means 924, and then transfers the flange-type coated corrugated steel pipe coated with the primary and still maintaining a high temperature to the sixth rail ( 906) and transferred to the second resin coating device 500.

The second resin coating device 500 fills the inside of the second resin powder box 421 with a general coating resin, and the same mechanism as the mechanism of the first resin coating device 400. 510). Thereafter, the flange-type coated corrugated steel pipe coated with the general resin secondarily through the second resin coating device 500 is moved along the seventh rail to the post-heating device 600. Post-heating device 600 ) as having substantially the same configuration as the aforementioned pre-heating device 300, using the guide operating shafts 601 and 602 and the heating unit 620 of the steel pipe feeding system 610, multi-coated plan Reheat the topographic coated corrugated steel pipe. That is, the post-heating device 600 smoothes the irregularly adhering general resin to the surface after passing through the second resin coating device 500, thereby forming a homogeneous surface. And, the post-heating device 600 The flanged clad corrugated steel pipe heated in the is transferred to the cooling device 700 along the eighth rail 908 by the guide operation shafts 601 and 602 of the steel pipe feeding system 610 .

The cooling device 700 rotates the post-heated flange-type coated corrugated steel pipe from the upper part of the ninth rail 909 using the guide operation shafts 701 and 702 of the steel pipe input and transfer system 710, and is cooled by natural cooling. The flange-type coated corrugated steel pipe is cooled. After that, the cooled flange-type coated corrugated steel pipe is moved to the 10th rail 910 by the guide operation shafts 701 and 702 of the steel pipe feeding system 710, The finished product is transported to the loading area by means of transportation. Hereinafter, the flange-type coated corrugated steel pipe of the present invention manufactured by the manufacturing method as described in detail above will be described in detail.

6A and 6B, the flange-type coated corrugated steel pipe 930 according to the present invention is provided with coated flanges 20 attached to both ends, and a hot-dip galvanized steel sheet having a thickness of 5t or less is applied to the body of the body. Since it is used as a material, it basically has a base portion 931 on which a galvanized layer is laminated. In addition, the coated corrugated steel pipe 930 manufactured according to the present invention has an integral double-coated structure in which the resin layers 932 and 933 are double coated on both the base portion 931 and the surface of the flange 20. For example, The base 931 is made of a zinc steel strip dedicated to corrugated steel pipe, and is made of a material having an ultra-thick gold layer with a zinc content of 600 g/m 2 .

In addition, the adhesive resin layer 932 is fused to a heated metal component to have excellent adhesive strength, and has excellent adhesive performance to bond resins of other materials to each other, and does not contain a colorant. The material of the adhesive resin layer 932 is a polyolefin-based plastic powder resin such as polyethylene (PE) and polypropylene (PP), which are high-temperature adhesive resins with excellent transparency. As a result, the adhesive resin layer 932 plays a role in preventing the delamination of the coated corrugated steel pipe, which is caused by different resin components of the metal base portion 931 and the general resin layer 933 . The resin layers 932 and 933 are formed on the surface of the bolt hole 934 of the flange 20 and also cover the welded portion 935 of the flange 20 and the base 931, so that the welded portion (935) has the advantage of being able to prevent corrosion in advance.

As described above, the method for manufacturing a flange-type coated corrugated steel pipe according to the present invention includes a flange assembly tack welding device, a flange auto welding device, a pre-heating device, a first resin coating device, a second resin coating device, a post heating device, and cooling. By continuously manufacturing flange-type clad corrugated steel pipe by manufacturing equipment that sequentially arranges equipment, PLC control panel, rail system, and basic equipment in the longitudinal direction of the rail, the product completion cycle is relatively short, and productivity and work efficiency are reduced. It has very good advantages.

In addition, the manufacturing method of the flanged corrugated steel pipe according to the present invention can take a very short factory work line, so that it is possible to complete the cladded corrugated steel pipe products in a large quantity in a relatively short time. For example, the flanged corrugated steel pipe according to the present invention The flange-type coated corrugated steel pipe produced by the steel pipe manufacturing method has a multi-coated structure consisting of an adhesive resin layer and a general resin layer, so that the resin can be peeled off even in an acidic and wastewater treatment environment.

It can be minimized, and has excellent corrosion resistance and wear resistance. In addition, the flange-type coated corrugated steel pipe of the present invention has a uniform thickness on the body surface and flange of the corrugated steel pipe, which is very difficult to form a coating layer by forming corrugated threads and troughs. Due to the formation of the coating layers, it is a high-quality product that can prevent local corrosion and peeling of the resin in advance. In addition, the flange-type coated corrugated steel pipe of the present invention has a seamless pipe structure without welding parts, and Since the pipe work can be easily performed through the For those skilled in the art, various modifications, changes, additions, etc. will be possible within the spirit and scope of the present invention, and such modifications and changes will be regarded as belonging to the scope of the following claims.

1 is a flowchart illustrating a method for manufacturing a flange-type coated corrugated steel pipe of the present invention;
2 and 3 are perspective views for explaining the process of manufacturing the body of the corrugated steel pipe in the manufacturing method of the flange-type coated corrugated steel pipe according to the present invention;
4 is a plan view for explaining the manufacturing facility of the flange-type coated corrugated steel pipe used in the present invention, FIG. 5 is a cross-sectional view for explaining the arrangement relationship of the manufacturing facility shown in FIG.
6A and 6B are a perspective view and an enlarged cross-sectional view for explaining a flange-type coated corrugated steel pipe manufactured by the manufacturing method of the flange-type coated corrugated steel pipe shown in FIG. 1;

An object of the present invention is to manufacture a flange-type coated corrugated steel pipe that can efficiently and mass produce a flange-type coated corrugated steel pipe in which multiple resin coating layers are formed on the inner and outer surfaces of the corrugated steel pipe after welding the flange to the corrugated steel pipe Another object of the present invention is to coat an adhesive resin containing no colorant on the body surface of a galvanized corrugated steel pipe, and to contain a colorant on the surface of the adhesive resin layer. By coating the resin, it is possible to prevent peeling of the resin in advance when it is buried in the ground and treats various sewage and sewage, and has excellent durability, corrosion resistance and abrasion resistance, and is very economical flange-type coating because it can be mass-produced. It is intended to provide a corrugated steel pipe.

100: flange assembly tack welding device 200: flange auto welding device
300: pre-heating device 400: first resin coating device
450: high pressure blower 500: second resin coating device
600: post heating device 700: cooling device
800: PLC control unit 900: rail system
930: flange type sheathed corrugated steel pipe

Claims (6)

A method for manufacturing a flange-type coated corrugated steel pipe for forming and processing a steel sheet, the method comprising:
A step (S10) of manufacturing the body of a corrugated steel pipe by inserting the steel plate into the forming unit and the pipe making unit at an angle to the forming unit and the first welding step of temporarily joining the body and the flange of the corrugated steel pipe by inserting the body of the corrugated steel pipe into the flange, respectively ( S20, S30) and the flange type manufactured through the welding steps and the secondary welding step (S40, S50) of completely joining the body and the flange of the corrugated steel pipe after the body of the corrugated steel pipe is brought into close contact with the flange by the pipe expansion process Preheating the corrugated steel pipe (S60) and coating the heated flanged corrugated steel pipe with an adhesive resin in a first resin coating device (S70) and coating the coated flanged corrugated steel pipe with an adhesive resin in a second resin coating device Re-coating with a general resin (S80) and reheating the re-coated flanged corrugated steel pipe, and then cooling in air (S90, S100), In the first welding step (S20, S30), the The flange is fitted into the seating slit of the flange fixing roller shafts 101 and 102 of the flange assembly tack welding apparatus 100, and the body of the corrugated steel pipe is seated on the first elevating means 921 and 922, and then the first By the repeated hinge operation of the lifting means 921 and 922, the body of the corrugated steel pipe is inserted into the inner diameter of the flange while the shaft center of the body of the corrugated steel pipe coincides with the shaft center of the flange, and then the tag welder 104 A method for manufacturing a flange-type coated corrugated steel pipe, characterized in that the main body of the corrugated steel pipe to which the flange is temporarily joined is manufactured by tag welding the insertion part with a furnace.
According to claim 1, In the second welding step (S40, S50), after closely contacting and rotating a part of the main body of the corrugated steel pipe to which the flange is temporarily joined and the flange with the compression rotation mechanism of the flange auto welding apparatus 200, By completely joining with the auto welding machine 230, the basic flange
A method for manufacturing a flange-type coated corrugated steel pipe for manufacturing a shaped corrugated steel pipe. According to claim 1, The flange-type corrugated steel pipe is moved by rolling by the rails (901 to 910) and elevating means (921 to 925) of the rail system 900, the height of which is gradually reduced from the starting point to the end point. A method for manufacturing a flange-type coated corrugated steel pipe, characterized in that According to claim 1, The flange-type coated corrugated steel pipe is a guide operation shaft (201, 202) when the operation of the steel pipe feeding system (210, 310, 410, 510, 610, 710) respectively disposed along the rail system (900) , 301, 302, 401, 402, 601, 602, 701, 702) and
A method for manufacturing a flange-type coated corrugated steel pipe, characterized in that it is rotated. The body 30 of the corrugated steel pipe includes a flange assembly tack welding device 100, a flange auto welding device 200, a pre-heating device 300, a first resin coating device 400, and a second resin coating device In the flange-type coated corrugated steel pipe 930 manufactured by sequentially passing through 500 and a post-heating device 600 and a cooling device 700, the resin layers 932 and 933 have a base portion having an ultra-thick plating layer ( 931) and the surface of the flange 20 are double coated so as to be integrated
Flanged clad corrugated steel pipe, characterized in that it has a double clad structure The flange-type coated corrugated steel pipe according to claim 6, wherein the resin layers (932, 933) are made of an adhesive resin coated to surround the base part (931) and a general resin coated to surround the adhesive resin. .

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