CN106938284A - Method and device for manufacturing spiral ribbed steel pipe - Google Patents

Abstract

The invention relates to a method and a device for manufacturing a spiral ribbed steel pipe. To this end, the present invention provides a method for manufacturing a spiral ribbed steel pipe wound in a spiral form and then cut, the method including: a coated steel plate setting step of setting the coated steel plate with the coating on an uncoiler; a rib initial forming step of forming preliminary formed ribs in a deepened manner by a rib initial forming portion of a forming portion through a coated steel sheet unwound from the uncoiler; a rib intermediate stage forming step of making the edge curvature of the coating type bent steel sheet located between the preliminary formed ribs small by a rib intermediate stage forming section; a rib post-forming step of pressing the edge by a rib post-forming section and forming a coated rib flat steel plate having a complete rib on the coated flat steel plate; a lockseam forming step of pressing both side edges of the coated ribbed flat steel sheet to a lockseam forming portion to form a lockseam; a pipe making step, wherein the coating type rib flat steel plate with the seaming seam is formed into a spiral rib steel pipe through a pipe making part; and a steel pipe cutting step of cutting the spiral ribbed steel pipe to be formed into a pipe by a cutting portion. Thus, the present invention can prevent the reverse friction from being generated on the surface of the coated steel sheet by keeping the rotation speed or rotation amount of the roll provided with the forming part uniform, thereby preventing the coating from being damaged by the reverse friction.

Description

Method and device for manufacturing spiral ribbed steel pipe

technical field

The present invention relates to a method and device for manufacturing a spiral ribbed steel pipe, in particular, in the process of passing a coated steel plate wound on an uncoiler (uncoiler) through a forming (Forming) section, passing through an idler The initial rib forming part of the bearing, the rib intermediate forming part and the rib post forming part sequentially make the edge curvature of the coated bending steel plate between the pre-formed rib and the pre-formed rib smaller, and the edge is pressed into At right angles, the left and right sides of the rolls of the initial rib forming part, the rib intermediate forming part and the rib post forming part can be separated at the same time.

Background technique

Generally, concrete Hume pipes are mainly used as pipes to guide the movement of fluids in roads, harbors, sewage treatment plants, etc., but there is a problem that the concrete Hume pipes are difficult to carry and handle due to the increase in their own weight and volume. It may be necessary to invest in heavy equipment, and due to the decrease in workability and the increase in joints due to the installation and removal of molds during construction, the construction period is longer, and it is affected by the initial cement (cement) that connects the joints. Seasonal constraints due to freezing.

Recently, in the process of providing lock seams on both side parts at right angles to the longitudinal direction of a galvanized steel sheet and rolling them into a hollow spiral shape, a plated seam that connects the lock seams to each other is used. Zinc steel.

The galvanized steel sheet is all smooth except for the seam connection part of the pipe body, or formed in a spiral form using the rest part except the seam connection part of the pipe body Corrugated corrugated galvanized steel sheet.

However, there is a problem in that the surface strength of the galvanized steel sheet in which all parts of the pipe body are smooth except for the seam connection is weak, so the larger the diameter of the large steel pipe, the more it is formed. The deformability is more serious, and in the embedding operation of the galvanized steel sheet, the hemming seam connection part is detached due to twisting.

In addition, there is still another problem that in the case of inadvertently applying an impact from the outside during the embedding work of the galvanized steel sheet, the surface of the pipe body is easily crushed, or when the impact is severe, torn.

As a solution to the above-mentioned problems, a method of manufacturing a flat corrugated steel pipe registered in Patent Publication No. 10-0780862 (2007.11.23) has been proposed, and the proposed method of manufacturing a flat corrugated steel pipe is rolled into a roll in a set After the flat-shaped galvanized steel sheet is installed in the uncoiler, when the uncoiler is operated, the galvanized steel sheet is released from the uncoiler and passes through the roll forming section on one side, At the same time, according to the forming roll structure of the roll forming part, plane folds are formed in the longitudinal direction, and the steel plate passing through the roll forming part is rolled into a spiral shape through the forming part, and the rolled edge part is connected with the seam. The steps of forming planar wrinkles are carried out sequentially as follows: After the step of forming convex parts in multiple steps, for the rest of the parts except the part where the planar wrinkles are formed, the width is gradually narrowed to the specified width, and the height is gradually increased. High; through the step of forming the concave portion curvedly in multiple steps, while pressing the convex portion flatly, the remaining part is pushed to its sides, and at the same time, the parts on both sides have angles, so that its width does not change greatly, and its height gradually become lower.

However, there is a problem in that the method of manufacturing flat corrugated steel pipes is only effective for pure galvanized steel sheets, in the case where a film to protect the surface is applied, due to the process of passing through the roll forming section The difference in the line speed of the upper and lower rolls in the medium causes reverse friction on the surface of the galvanized steel sheet.

In addition, there is a problem that, due to the above, the galvanized layer and the thin film coating formed on the surface of the galvanized steel sheet are damaged.

In addition, there is still another problem that since the diameter of the upper roll and the lower roll of the roll forming part becomes larger, the weight will be heavier, so that the operator will not be able to work during the production, inspection and replacement of the upper and lower rolls. There is a risk of accidents and it requires a lot of time and expense.

【Prior technical literature】

【Patent Literature】

(Patent Document 1) Registered Patent Publication No. 10-0780862 (2007.11.23)

Contents of the invention

In the present invention, the rotation speed or the amount of rotation of the upper and lower parts of the forming part is kept uniform through the idle bearing, thereby, since the linear speed is kept uniform, reverse friction on the surface of the coated steel sheet is prevented, and the coating layer is prevented from being damaged. At the same time, the left and right sides of each roll in the forming section are separated, so that manufacturing, inspection and replacement can be easily realized.

Regarding the manufacturing method of the spiral-ribbed steel pipe that is cut and formed after being wound into a spiral shape, the present invention is characterized in that the manufacturing method of the spiral-ribbed steel pipe includes: a coated steel plate setting step S100, a coated steel plate having a coating C The layered steel plate S1 is set in the uncoiler 100; the initial rib forming step S200, the coated steel plate S1 released from the uncoiler 100 passes through the rib initial forming part 230a of the forming part 200 to make the pre-formed rib RR with a certain interval along the Forming in a form that gradually deepens along the length direction; the mid-rib forming step S300, the coating-type curved steel plate S2 located between the pre-formed rib RR and the pre-formed rib RR passes through the mid-rib forming part 230b to make the edge curvature gradually smaller; Rib post-forming step S400, the edge of the coated curved steel plate S2 and the edge of the pre-formed rib RR are pressed into a right angle by the rib post-forming part 203c, and a complete rib CR is formed on the coated flat steel plate S3 The coating-type ribbed flat steel plate S4; seam forming step S500, the lower seam forming roll 241- 2 and the higher seam seam forming roll 242-2 to obtain pressurization and form the seam seam L; the pipe making step S600, the coated rib flat steel plate S4 formed with the seam seam L is passed through the pipe making The part 300 is formed into a spiral-ribbed steel pipe RP; and a steel pipe cutting step S700, the spiral-ribbed steel pipe RP being made into a pipe is cut off by the cutting part 400.

In addition, it is characterized in that the pre-formed rib RR in the initial rib forming step S200 and the complete rib CR in the rib intermediate forming step S300 and rib post-forming step S400 pass through the roller bearing 232-4 of the variable pressure roll part 232. The higher pressure idler roll 232-3 is used to keep the linear velocity of the higher pressure fixed roll 232-2 consistent with the lower support concave roll 231-3 supporting the fixed roll portion 231.

In addition, regarding the spiral-ribbed steel pipe manufacturing apparatus A, the spiral-ribbed steel pipe manufacturing apparatus A includes: an uncoiler 100 on which the coated steel sheet S1 having a coating is wound; a forming section 200 to uncoil from the The coated steel sheet S1 released by the machine 100 is pressed in the form of the rib R and the seam L; The steel plate S4 is wound into a spiral shape by the pipe making part 300, thereby forming a spiral ribbed steel pipe RP, and causing the spiral ribbed steel pipe RP to be cut off. The feature of the present invention is that the forming part 200 is configured to have The upper part of the support frame 220 of the part 210 is arranged with the rib forming part 230 formed with the rib R and the seam forming part 240 formed with the seam L from the front to the rear, and the supporting and fixing roll part 231 is set to be fixed on the support. The shaft 231-1 is fixed with a lower (lower) support convex roll 231-2 and a lower support concave roll 231-3 in the form of repeated arrangement along the axial direction. -1 Along the axial direction, a higher pressure fixed roll 232-2 and a higher pressure idler roll 232-3 are arranged in a repeated arrangement, and the higher pressure fixed roll 232-2 is fixed on a pressure variable shaft 232-1, and the higher pressurized idler roll 232-3 is rotatably provided on the pressurized variable shaft 232-2 through an idler bearing 232-4, and the lower support convex roll 231- 2 and the higher pressure fixed roll 232-2 are arranged so that the left and right sides are separated.

In addition, in the higher pressurized idler roll 232-3, the outer ring of the idler bearing 232-4 is coupled to a roller main body 232-3a having a short ridge groove 232-3b formed on one side in the form of an interference fit. Inner peripheral portion, and the inner ring of the idle bearing 232-4 is combined with the variable pressurization shaft 232-1 in the form of interference fit, and the outer ring of the idle bearing 232-4 is fixed by the stop ring 232-3d , the stop ring 232-3d is combined with the ring groove 232-3c formed on the other side of the short rib groove 232-3b, and the roller body 232-3a is formed to have a width W narrower than the width W of the roller body 232-3a. The rib forming pressing ring part 232-3e of width W' protrudes from the outer edge part, and the higher pressing fixed rolls 232-2 located on both sides of the roll main body 232-3a are respectively formed with roll main body insertion grooves 232. -3f.

In addition, it is characterized in that the rib forming part 230 includes a rib initial forming part 230a, a rib intermediate forming part 230b, and a rib post forming part 230c, and the seam forming part 240 supports the fixed roll part 241 at the seam. The upper part of the seam seam is provided with a seam pressure variable roller part 242, and the seam seam support fixed roller part 241 is provided with lower seam seam joints at both ends of the seam seam support fixed shaft 241-1. seam forming roll 241-2, the seam seam pressing variable roll part 242 is provided with higher seam seam forming rolls 242-2 at both ends of the seam seam variable shaft 242-1.

The present invention has the effect that in the process of passing the coated steel plate with coating wound on the uncoiler through the forming section, the rib initial forming section, the rib intermediate forming section and the rib post forming section with idle bearings are used to make each The rotational speed or amount of rotation of the rolls provided with the forming section is kept constant.

In addition, there is an effect obtained by making the line speed uniform, thereby preventing reverse friction from occurring on the surface of the coated steel sheet.

In addition, this has the effect that the coating provided on the surface of the coated steel sheet is prevented from being damaged due to reverse friction, and a high-quality product can be obtained.

At the same time, an effect can be obtained in that the left and right sides of the rolls of the initial rib forming part, the rib intermediate forming part and the rib post forming part are separated, thereby reducing the weight and making it easy to manufacture, inspect and replace.

In addition, there can be obtained the effect of reducing the labor, time, and cost required for inspection and replacement, and at the same time, the effect of further improving the production rate can be obtained.

Description of drawings

FIG. 1 is an illustration showing a spiral-ribbed steel pipe manufacturing apparatus according to the present invention.

Fig. 2 is a perspective view showing a rib mid-stage forming part of the forming part in the spiral-ribbed steel pipe manufacturing apparatus according to the present invention.

3 is a perspective view showing a variable pressure roll section in a rib intermediate forming section of a forming section in a spiral ribbed steel pipe manufacturing apparatus according to the present invention in a separated form.

4 is a cutaway perspective view showing the inside and outside of the variable pressure roll section in the rib intermediate forming section of the forming section in the spiral ribbed steel pipe manufacturing apparatus according to the present invention.

Fig. 5 is a perspective view showing in a separated form a support fixed roll part in a rib intermediate forming part of a forming part in a spirally ribbed steel pipe manufacturing apparatus according to the present invention.

Fig. 6 is a perspective view showing, in cutaway form, a support fixed roll portion in a rib intermediate forming section of a forming section in a spiral ribbed steel pipe manufacturing apparatus according to the present invention.

Fig. 7 is a sequence diagram showing a method of manufacturing a spiral-ribbed steel pipe according to the present invention.

8a to 8n are illustrations sequentially showing a method of manufacturing a spiral-ribbed steel pipe according to the present invention.

9 is an enlarged longitudinal sectional view of a concave portion of a spiral-ribbed steel pipe manufactured by a spiral-ribbed steel pipe manufacturing apparatus according to the present invention.

detailed description

Embodiments of the present invention are described below with reference to the accompanying drawings.

Fig. 1 is an illustration showing a spiral-ribbed steel pipe manufacturing device according to the present invention, Fig. 2 is a perspective view showing a rib mid-stage forming part of a forming part in a spiral-ribbed steel pipe manufacturing device according to the present invention, and Fig. 3 is a The separated form shows the perspective view of the variable pressure roll part in the rib intermediate forming part of the forming part of the spiral ribbed steel pipe manufacturing device according to the present invention, and Fig. 4 shows the spiral ribbed steel pipe according to the present invention in cut form Figure 5 is a perspective view of the inside and outside of the variable pressure roll part in the forming section of the rib mid-stage forming section in the ribbed steel pipe manufacturing device, Figure 5 is a separate form showing the ribs of the forming section in the spiral ribbed steel pipe manufacturing device according to the present invention The perspective view of the support and fixed roll part in the intermediate forming part, Fig. 6 is a perspective view of the support and fixed roll part in the rib intermediate forming part of the forming part in the forming part of the spiral ribbed steel pipe manufacturing device according to the present invention in cutaway form.

As shown in FIGS. 1 to 6 , before describing the manufacturing method of the spiral-ribbed steel pipe according to the present invention, the manufacturing apparatus A for manufacturing the spiral-ribbed steel pipe, as a device for manufacturing the spiral-ribbed steel pipe, includes uncoiling Machine 100, forming part 200, pipe making part 300 and cutting part 400, the coated steel sheet S1 with the coating is set in the uncoiler 100 in the form of winding, and the coated steel sheet S1 unwound from the uncoiler 100 is set In order to form the rib R and the hemming seam L in the process of being pressed by the forming part 200.

The coated ribbed flat steel plate S4 formed with the rib R and the seam L is arranged to be wound in a spiral form by the pipe making part 300, thereby forming a spiral ribbed steel pipe RP, and passed through the cutting part 400 The spiral ribbed steel pipe R P is truncated to have a certain length.

In the process, the forming part 200 is provided to prevent reverse friction from occurring on the surface made of galvanized steel sheet during roll forming of the coated steel sheet S1 formed with the coating layer C having a prescribed thickness, thereby preventing The coat C is broken or damaged, and a high-quality product can be obtained.

To this end, the forming part 200 is configured such that the rib forming part 230 and the seam forming part 240 can be driven simultaneously from the front to the rear by the driving part 210 on the upper part of the supporting frame 220 having the driving part 210 .

The rib forming part 230 is used to form a quadrilateral rib R on the coated steel sheet S1 having a flat plate shape without damage to the coating C, and is provided in such a way that a rib initial forming part 230a and a rib intermediate forming part 230b are provided in this order. And the rib post-forming part 230c, and can be pressurized in sequence.

The rib initial forming part 230a, the rib intermediate forming part 230b and the rib post forming part 230c are arranged to be respectively connected to the driving part 210 of the lower part with a chain (chain) etc., and are directly driven by the supporting fixed roll part 231 and the upper part. The variable pressure roll parts 232 may face each other.

The supporting and fixing roll part 231 is configured so that it cannot move from the upper part to the lower part or from the lower part to the upper part in the state of being rotatably installed on the supporting frame 220 by bearings (bearings) etc. -1 is fixed with a lower (lower) support convex roll 231-2 and a lower (lower) support concave roll 231-3 in the form of repeated arrangement in the axial direction.

The variable pressurizing roll part 232 is repeatedly arranged on the support fixed on the support frame 220 along the axial direction in the form that the lower part can face the lower support convex part roll 231-2 and the lower support concave part roll 231-3. directly above the shaft 231-1, and arranged so that the upper (Upper) pressurized fixed roll 232-2 and the lower pressurized shaft 232-1 parallel to the support fixed shaft 231-1 are repeatedly arranged along the axial direction. High (Upper) pressurizes the idle roll 232-3, and is set so that the line speed can be kept consistent during the process of being driven.

In terms of the linear velocity, although the diameter of the lower support concave roll 231-3 of the support fixed roll portion 231 described later is smaller than the diameter of the lower support convex roll 231-2, the support fixed shaft 231-1 is moving forward. In the process of producing a difference in peripheral speed during rotation, reverse friction occurs, but at this time, by the higher pressure idler roll 232-3 of the variable pressure roll portion 232 facing the lower support concave roll 231-3, to compensate for the difference in peripheral speed. In other words, since the line speed is kept uniform, reverse friction is prevented from being generated on the surface of the coated steel sheet S1 passing therebetween, whereby the coating C can be prevented from being damaged or broken.

For this purpose, the higher pressure fixed roll 232-2 is fixed to the pressure variable shaft 232-1, and the higher pressure idle roll 232-3 is rotatably installed on the idler bearing 232-4. Pressurized variable shaft 232-2.

As for the lower support convex roll 231-2 and the higher pressurized fixed roll 232-2, the left and right sides are separated, and since the size and weight are significantly reduced, it is necessary to perform manufacturing, storage, inspection, and replacement. During the process, the operator can easily operate. At this time, in the higher pressurized idler roll 232-3, the outer ring of the idler bearing 232-4 is combined with the roller (roller) main body 232-232- with a short ridge groove 232-3b formed on one side in the form of interference fit. 3a inner peripheral portion, and the inner ring of the idling bearing 232-4 is combined with the variable pressure shaft 232-1 in the form of interference fit.

The outer wheel of the idling bearing 232-4 is fixed by a stop ring 232-3d, so as to prevent the idling bearing 232-4 from being moved during the driving process, and the stop ring 232-3d is formed on the short The ring groove 232-3c on the other side of the flange groove 232-3b is combined.

The roller main body 232-3a is formed to have a rib-forming pressing ring portion 232-3e having a width W' narrower than the width W of the roller main body 232-3a protruding from the outer edge, and the roller main body 232-3a is located at the outer edge. The higher pressurized fixed rolls 232-2 on both sides of the upper side are respectively formed with roll body insertion grooves 232-3f.

As shown in FIG. 9, the seam forming part 240 forms seams L on both sides of the coated flat steel plate S4 so that they face each other during the rolling process by the pipe making part 30, On the upper portion of the seam supporting fixed roller portion 241, a seam pressing variable roll portion 242 is provided.

Here, the seam seam support and fixed roll part 241 is provided with lower seam seam forming rollers 241-2 at both ends of the seam seam support fixed shaft 241-1, and the seam seam The pressure variable roll unit 242 is provided with higher seam forming rolls 242-2 at both end portions of the variable seam shaft 242-1.

FIG. 7 is a sequence diagram showing a method of manufacturing a spirally ribbed steel pipe according to the present invention, and FIGS. 8a to 8n are illustration diagrams sequentially showing a method of manufacturing a spirally ribbed steel pipe according to the present invention.

As shown in FIGS. 7 and 8a to 8n, with respect to the spiral-rib steel pipe A as described above, first, as a coated steel plate setting step S100, a coated steel plate S1 coated with a coating C having a predetermined thickness is After being installed in the uncoiler 100 , the coated steel sheet S1 is released from the uncoiler 100 at a constant speed and supplied to the forming unit 200 .

Next, as shown in FIGS. 8a to 8e, the loosened coated steel sheet S1 passes through the rib initial forming part 230a of the forming part 200 so that the pre-formed ribs RR with a certain interval are formed in a form that gradually deepens along the length direction ( Initial rib formation step S200).

Next, as shown in Fig. 8f to Fig. 8h, as the rib mid-stage forming step S300, the coating type curved steel plate S2 with the pre-formed rib RR is formed as the coating of the part between the pre-formed rib RR and the pre-formed rib RR. After the edge curvature of the layer-type curved steel plate S2 is gradually reduced by the rib mid-stage forming part 230b, as shown in FIG. At right angles, and a coated-type ribbed flat steel plate S4 having complete ribs CR is formed on the coated-type flat steel plate S3 (rib post-forming step S400). At this time, the pre-formed rib RR in the initial rib forming step S200 and the complete rib CR in the rib intermediate forming step S300 and rib post-forming step S400 pass through the variable pressure roller part 232 with the idler bearing 232-4. Pressurizing the idle roll 232-3 keeps the line speeds of the higher pressurized fixed roll 232-2 consistent with the lower support recessed roll 231-3 supporting the fixed roll portion 231, thereby preventing the coating on the coated steel sheet S1. The coating C on the surface is damaged due to reverse friction.

Next, as shown in FIG. 8j to FIG. 8n, as a seam forming step S500, the lower seam forming rollers of the seam forming part 240 pass through the two side edges of the coated ribbed flat steel plate S4 241-2 and the higher seam forming roll 242-2 are pressed to form the seam L, as shown in Figures 1 and 7, the coated ribs of the seam L are formed The flat steel plate S4 is formed into a spiral ribbed steel pipe RP by the pipe making part 300 (pipe making step S600).

Next, as shown in FIG. 9 , the spirally ribbed steel pipe RP having the rib R and the seam L is manufactured by the steel pipe cutting step S700 in which the spirally ribbed steel pipe RP to be piped is cut through the cutting part 400 .

Label description

C: Coating CR: Rib

L: Rolled Seam RP: Spiral Ribbed Steel Tube

RR: Preformed rib S1: Coated steel plate

S2: Coated type curved steel plate S3: Coated type flat steel plate

S4: Coated ribbed flat steel plate S100: Coated steel plate setting procedure

S200: Rib formation step S300: Rib formation step

S400: Rib post-forming step S500: Hemming seam forming step

S600: Pipe making step S700: Steel pipe cutting step

100: Uncoiler 200: Forming department

200: Forming section 210: Driving section

220: Support frame 230: Rib forming part

230a: Rib initial forming part 230b: Rib intermediate forming part

203c: Rib post-forming part 231: Supporting and fixing roll part

231-1: Support fixed shaft 231-2: Lower support convex roll

231-3: Low support concave roll 232: Variable pressure roll

232-1: Variable pressure shaft 232-2: Higher pressure fixed roll

232-3: Higher pressure idling roll 232-4: Idling bearing

240: Seam forming section 241-1: Lower seam forming roll

242-2: High Seam Forming Rolls 300: Tube Department

400: Truncation Department

Claims (5)

1. A method for manufacturing a spiral-ribbed steel pipe, which is a method for manufacturing a spiral-ribbed steel pipe formed after being wound into a helical form, characterized in that, the method for manufacturing a spiral-ribbed steel pipe comprises: The coated steel plate setting step (S100), so that the coated steel plate (S1) with the coating (C) is set on the uncoiler (100); In the rib initial forming step (S200), the coated steel sheet (S1) released from the uncoiler (100) passes through the rib initial forming part (230a) of the forming part (200) to make preliminary forming ribs (RR ) is formed in the form of gradually deepening along the length direction; The mid-rib forming step (S300), the coated curved steel plate (S2) located between the pre-formed rib (RR) and the pre-formed rib (RR) passes through the rib mid-stage forming part (230b) to gradually reduce the edge curvature ; Rib post-forming step (S400), the edge of the coated type curved steel plate (S2) and the edge of the pre-formed rib (RR) are pressed into a right angle by the rib post-forming part (203c), and the coated type flat steel plate (S3) Formed with a coating-type ribbed flat steel plate (S4) having complete ribs (CR); A seam forming step (S500), passing the lower seam forming rolls (241-2) of the seam forming part (240) on both sides of the coated ribbed flat steel plate (S4) With higher seam forming rolls (242-2) to get pressurized and form seam (L); The pipe making step (S600), the coated ribbed flat steel plate (S4) formed with the seam seam (L) is formed into a spiral ribbed steel pipe (RP) by the pipe making part (300); and A steel pipe cutting step (S700) such that the spirally ribbed steel pipe (RP) made into a pipe is cut through a cutting part (400). 2. The manufacturing method of spiral ribbed steel pipe according to claim 1, characterized in that, The pre-formed rib (RR) in the initial rib forming step (S200) and the complete rib (CR) in the rib intermediate forming step (S300) and rib post-forming step (S400) pass through the variable pressure roll part (232). The higher pressurized idler roll (232-3) with idler bearing (232-4) makes the higher pressurized fixed roll (232-2) and the lower support recessed roll (231-2) supporting the fixed roll portion (231) 3) The line speed remains the same. 3. A spiral-ribbed steel pipe manufacturing device, which is a spiral-ribbed steel pipe manufacturing device (A), and the spiral-ribbed steel pipe manufacturing device (A) includes: an uncoiler (100), which is wound with a coated a layered steel sheet (S1); a forming section (200) for pressing the coated steel sheet (S1) unwound from said uncoiler (100) in the form of ribs (R) and hemmed seams (L); The cut-off part (400) is arranged such that the coated ribbed flat steel plate (S4) formed with the rib (R) and the seam (L) is wound into a spiral form by the pipe-making part (300), thereby A spiral-ribbed steel pipe (RP) is formed, and the spiral-ribbed steel pipe (RP) is cut off, the spiral-ribbed steel pipe manufacturing apparatus is characterized in that, The forming part (200) is arranged such that the rib forming part (230) formed with the rib (R) and the rib forming part (230) formed with the hemming seam are arranged from the front to the rear on the upper part of the support frame (220) having the driving part (210). (L) seam seam forming part (240), the supporting fixed roll part (231) is arranged as, on the supporting fixed shaft (231-1) along the axial direction, the lower supporting convex part rolls are fixed in the form of repeated arrangement (231-2) and the lower support concave roll (231-3), the variable pressure roll part (232) is provided with higher pressure in the form of repeated arrangement along the axis direction of the variable pressure shaft (232-1). Press the fixed roll (232-2) and the higher pressurized idler roll (232-3), the higher pressurized fixed roll (232-2) is fixed on the pressurized variable shaft (232-1), and the The higher pressurized idler roll (232-3) is rotatably provided on the pressurized variable shaft (232-2) by an idler bearing (232-4), and the lower support convex roll (231-2 ) and higher pressurized fixed rolls (232-2) are set to be separated on the left and right sides. 4. The spiral ribbed steel pipe manufacturing apparatus according to claim 3, characterized in that, In the higher pressurized idler roll (232-3), the outer ring of the idler bearing (232-4) is combined with the roll body (232) with a short ridge groove (232-3b) formed on one side in the form of interference fit. -3a) The inner peripheral portion, and the inner ring of the idle bearing (232-4) is combined with the variable pressurization shaft (232-1) in the form of interference fit, and the outer ring of the idle bearing (232-4) Fixed by a stop ring 232-3d combined with a ring groove 232-3c formed on the other side of the short ridge groove 232-3b, the roller main body (232-3a) is formed to have The rib-forming pressing ring part (232-3e) of width (W') narrower than the width (W) of the roller main body (232-3a) protrudes from the outer edge part, and is positioned at the roller main body (232-3a) The higher pressure fixed rollers (232-2) on both sides of the roller body are respectively formed with roller body insertion grooves (232-3f). 5. The spiral ribbed steel pipe manufacturing apparatus according to claim 3, characterized in that, The rib forming part (230) includes a rib initial forming part (230a), a rib intermediate forming part (230b) and a rib post forming part (230c), and the hemming seam forming part (240) is formed at the hemming seam The upper part of the supporting fixed roll part (241) is provided with a crimp seam pressurized variable roll part (242), and the crimp seam supporting fixed roll part (241) supports the fixed shaft (241-1) at the crimp seam ) are provided with lower seam forming rolls (241-2), and the seam press variable roll part (242) is on the variable shaft (242-1) of the seam The two side ends of the side are provided with higher crimping seam forming rolls (242-2).