JP4894188B2 - U-shaped steel sheet pile roller straightening method and apparatus - Google Patents

Description

  The present invention relates to a roller correction method and apparatus for a U-shaped steel sheet pile having an arm portion between a flange portion and a joint portion.

  The U-shaped steel sheet pile is deformed in the longitudinal direction after rolling and cooling due to a difference in rolling end temperature due to a difference in sheet thickness between the flange and the web. FIG. 10 is a diagram showing a deformation called upper warping of the U-shaped steel sheet pile 100, showing a state of warping toward the web portion 101, and FIG. 11 is a deformation called lower warping, warping toward the arm portion 102 supporting the joint. Indicates the state.

  In the roller straightening method, the upper and lower sides of the web of the U-shaped steel sheet pile in which such warpage occurs are constrained by rolls, and the U-shaped steel sheet pile is bent by applying a force that causes partial plastic deformation so that the upper and lower sides are alternated. It returns and removes the warp.

  FIG. 12 shows a general arrangement of rolls in the roller straightening method. In the material passing direction of the U-shaped steel sheet pile 100, upper rolls 200a to 200d are arranged on the upper side of the web, and lower rolls 300a to 300e are arranged on the lower side of the web. Are arranged in a staggered pattern.

  Furthermore, these upper and lower rolls are arranged so that the lowermost end of the outer peripheral surface of each roll of the upper rolls 200a to 200d is below the uppermost end of the outer peripheral surface of each roll of the lower rolls 300a to 300e. The sheet pile 100 passes through a material passage (pass line) having irregularities in the vertical direction.

  As a result, the U-shaped steel sheet pile is supported at three points between each of the upper rolls 200a to 200d and the lower rolls 300a to 300e, and it is possible to remove the warp by alternately bending and bending back from the vertical direction. .

    On the other hand, steel sheet piles with various cross-sectional shapes have been developed due to the increase in civil engineering work and the development of new construction methods. In U-type steel sheet piles, the flange part and joint are provided with a joint part directly at the tip of the flange part. It is divided roughly into the form which provided the arm part between the parts.

  Patent Document 1 relates to the former U-shaped steel sheet pile roller straightening machine, and in order to prevent the waviness of the steel sheet pile grip part, a part of the U-shaped steel sheet pile web and a part of the shoulder part from the web to the flange are moved up and down. In order to prevent deformation in the width direction of the roll group constrained in the direction and the U-shaped steel sheet pile, grip side rolls that are in contact with the right and left joint portions from the outside are arranged.

  Patent Document 2 relates to a roller correction method for a U-shaped steel sheet pile in which an arm portion is provided between a flange portion and a joint portion, and the angle of attachment of the arm portion 34 to the flange portion 32 when three points are supported by an upper roll and a lower roll. The purpose is to prevent change.

  FIG. 13 shows a cross-sectional shape of the straightening roll, and has a cross-sectional shape that constrains the web portion 101, the flange portion 102, and the arm portion 103 together so that the arm portion 103 is further restrained by the web portion 101 and the flange portion 102. A roll 105 and a lower roll 106 are used, and an outer roller 107 that restrains the joint portion 104 from the outside is disposed in order to restrain the arm portion 103.

By adopting the roll arrangement described above, deformation of the arm portion 103 is prevented when bending deformation is repeatedly applied to the U-shaped steel sheet pile.
JP-A-55-70418 Japanese Patent No. 2874611

  When the roller straightening machine described in Patent Document 1 is used as a correction method for a U-shaped steel sheet pile having an arm portion between the flange portion and the joint portion, the arm portion is not restrained, so the angle of attachment of the arm portion to the flange portion is It changes and the cross-sectional shape is damaged.

  Moreover, since the correction method of patent document 2 uses the up-and-down roll which integrated the part corresponding to a web part, a flange part, and an arm part, the appropriate amount of reduction according to a deformation | transformation state is set with a web part. It cannot be set individually at the arm part, and the web part or the arm part cannot be selectively reduced to impart bending deformation.

  In actual operation, in the case of a U-shaped steel sheet pile having an arm part between the flange part and the joint part, the warp of the web part and the warp of the left and right arm parts often differ in the direction and size, and the warp of the web part. Even if it was set to a rolling condition that could correct the web, the warp of the arm part could not be corrected, or conversely, even if it was set to a rolling condition that could correct the warp of the arm part, the warp of the web part could not be corrected. .

  In addition, the roll surface that rolls down the web and the roll surface that rolls down the arm have the same rotational speed despite the roll diameter being different, resulting in a circumferential speed difference between the roll and the U-shaped steel sheet pile. It has also been pointed out that scuffing occurs in the product (U-shaped steel sheet pile).

  The present invention has been made in view of these problems, and it is possible to appropriately correct both the web portion of the U-shaped steel sheet pile provided with an arm portion between the flange portion and the joint portion, and the warp of the arm portion. It is an object of the present invention to provide a roller straightening method and apparatus.

  The present inventors use an integrated upper roll 13 and an integrated lower roll 14 shown in FIG. 5 in which the shape of the cross section of the U-shaped steel sheet pile is engraved on the roll surface as an upper roll and a lower roll of a roller straightening machine. A straightening experiment was conducted to investigate the deformation state and warping correction effect of the U-shaped steel sheet pile during straightening.

  In this investigation, all of a plurality of upper rolls (lower rolls) of the roller straightening machine were integrated upper rolls 13 (integrated lower rolls 14) shown in FIG.

  The deformation state of the U-shaped steel sheet pile during straightening is schematically shown in FIGS. In the U-shaped steel sheet pile 1, the portion where the reduction is applied by the integrated upper roll 13 is deformed in the direction in which the entire width is reduced, so that the reduction force is not applied to the arm portion, and the desired plastic strain can be applied. I can't (Figure 6).

  On the other hand, the portion where the rolling is applied by the integrated lower roll 14 is deformed in the direction in which the entire width is widened, so that the arm is not loaded with the rolling force, and the desired plastic strain cannot be applied. (FIG. 7).

  For this reason, although it was possible to correct the warp of the web part, it was not possible to completely correct the warp of the arm part, resulting in partial warping of the arm part.

  Next, the roll width is reduced only in the vicinity of the arm portion, the width of the roll is set such that the arm portion is sandwiched from the lower part of the flange, and a part of the joint portion can be rolled. As a roll), a straightening experiment was conducted in which the arm part was crushed down intensively, and the warp straightening effect of the U-shaped steel sheet pile was investigated.

  As a result, although it was possible to correct the warp of the arm portion, the web portion could not be warped because a rolling force could not be applied to the web portion.

  From these results, when the upper and lower straightening rolls in the roll straightening machine are rolls that selectively roll down only the web part and other rolls that selectively roll down only the arm part, the web part and arm It was found that both parts can be corrected.

  A. When the reduction position of at least two adjacent straightening rolls is the web portion or arm portion of the steel sheet pile, and either the web portion or the arm portion is continuously rolled down, these straightening rolls are connected to the web portion. More effective bending / unbending deformation can be applied as compared with the case where the arms are alternately rolled down. In this case, the correction rolls only need to be adjacent to each other in the material passing direction, regardless of the upper and lower order.

  For example, when the web part (arm part) is squeezed in the order of the upper roll (lower roll) and the lower roll (upper roll) in the material passing direction, the web part (arm part), lower roll ( The correction effect is greater than when the arm (web portion) is rolled down with the upper roll).

b. Furthermore, by restraining the outer surface side of the joint portion, fluctuation in the width direction of the U-shaped steel sheet pile is suppressed, and the correction effect is enhanced.
I also found something new.

The present invention has been made on the basis of the obtained knowledge, that is, the present invention has been made. That is, the present invention includes: 1. a web portion, a flange portion, a joint portion, and an arm portion between the joint portion and the flange portion. In the method of correcting a roller of a U-shaped steel sheet pile, the roller correction of a U-shaped steel sheet pile having an arm portion, wherein the web portion and the arm portion are selectively imparted with at least one bending deformation in the longitudinal direction. Method.

2. 2. The method for correcting a roller of a U-shaped steel sheet pile having an arm part according to 1 , wherein the bending deformation in the longitudinal direction is applied to either the arm part or the web part at least twice continuously.

3. The roller correction method for a U-shaped steel sheet pile having arm portions according to 1 or 2, further comprising constraining the left and right joint portions from the outside when imparting bending deformation in the longitudinal direction .

4). A roller correction device for a U-shaped steel sheet pile having an arm portion between a web portion, a flange portion, a joint portion, and a joint portion and a flange portion, wherein the web portion or the arm portion is selectively rolled down to the part A roller straightening device for a U-shaped steel sheet pile having arm portions, comprising a straightening roll that selectively imparts bending deformation in the longitudinal direction .

  5. The roller correction device for a U-shaped steel sheet pile having an arm portion according to 4, wherein at least two adjacent correction rolls selectively reduce the web portion or the arm portion.

  6). The roller straightening device for a U-shaped steel sheet pile having arms as described in 4 or 5, wherein the lower roll of the straightening roll further restrains fluctuations in the width direction of the U-shaped steel sheet pile.

  7). The straightening roll has a plurality of sleeves and an arbor to which the sleeves are fitted, and the sleeves are rolled onto a part of the U-shaped steel sheet pile cross-sectional shape, and the part of the cross-section is rolled down. Any one of 4 to 6, wherein the sleeve has a roll diameter capable of loading a force, and the sleeve is fitted to the arbor so that the rolling surface is along a cross section of the U-shaped steel sheet pile. A roller straightening device for a U-shaped steel sheet pile having the arm portion according to claim 1.

  8). The roller correction device for a U-shaped steel sheet pile having an arm portion according to any one of 4 to 7, wherein a sleeve constituting the correction roll is rotatably attached to the arbor.

  According to the present invention, after rolling and cooling, even when the web part and the arm part are warped differently, each part can be corrected, and the surface of the product (U-shaped steel sheet pile) by roller correction can be corrected. It is extremely useful industrially because it can prevent generation of scratches.

That is,
1. A step of selectively lowering the arm portion with upper and lower rolls to impart bending deformation of the arm portion, and a step of selectively lowering the web portion with upper and lower rolls to impart bending deformation of the web portion, respectively. By doing it at least once, you can arbitrarily correct the warpage of the web part and the warp of the arm part.
2. Since the outer surface of the joint part of the U-shaped steel sheet pile is restrained when the web part or the arm part is rolled down, a larger correction effect can be imparted while preventing the U-shaped steel sheet pile from spreading and deforming in the full width direction. .
3. Since a predetermined diameter difference is provided between the sleeve for lowering the web and the sleeve for lowering the arm, a roll for selectively lowering the web and a roll for selectively lowering the arm can be freely selected. , It is possible to easily change the roll diameter difference in accordance with fluctuations in the total height and width of the actual product (U-shaped steel sheet pile).

  4). Since the sleeve is attached to the arbor so as to be freely rotatable, even when the sleeve for lowering the web portion and the sleeve for lowering the arm portion are incorporated in one arbor, the sleeve for lowering the web portion and the sleeve for lowering the arm portion The circumferential speed difference between the product and the surface of the product (U-shaped steel sheet pile) can be prevented.

  The present invention is characterized in that, in the roller correction of a U-shaped steel sheet pile, the web portion or the arm portion is selectively crushed and at least two bending deformations are imparted independently to each portion.

  Independence in the present invention means that the web portion and the arm portion are not simultaneously squeezed by one straightening roll, but differ in time.

  “Selective” refers to intensive reduction of a specific part from the cross-sectional shape of the U-shaped steel sheet pile, and selective reduction of the web part or arm part means intensive reduction of only the web part or arm part. Means.

In addition, when the web part or the arm part is squeezed, in the case of the web part, it means that the web part or the part of the web part and the flange part includes the part adjacent to the web and is squeezed down. Indicates that the arm part is rolled down including only the arm part, a part of the arm part and the joint part, and a part of the flange including the part adjacent to the arm part.
Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram for explaining an embodiment of a roll correction method according to the present invention. In the figure, 1 is a U-shaped steel sheet pile having arms, 2a (2b, 2c, 2d) are upper rolls, 3a (3b, 3c) 3d) shows a lower roll, and the upper roll and the lower roll are arranged so as to form a zigzag shape at the top and bottom, and are adjusted so that each of them can apply a rolling force at a portion in contact with the U-shaped steel sheet pile 1. The generic term for the upper roll and the lower roll is the straightening roll.

  The upper roll 2a, the lower roll 3b, and the upper roll 2b, which are sequentially arranged in the material passing direction of the U-shaped steel sheet pile 1, reduce the arm portion, and the lower roll 3c, the upper roll 2c, the lower roll 3d, and the upper roll 2d are the web portion. Press down. The lower rolls 3a and 3e are drive rolls for conveying the U-shaped steel sheet pile 1, and roll down the arm portion and the web portion.

  In the above figure, the U-shaped steel sheet pile 1 is continuously rolled down a plurality of times in the order of the arm portion and the web portion, but the present invention is independently bent and deformed at least once on the arm portion or the web portion. There is no particular limitation on the order of correcting the arm portion or the web portion in the roller correction or the upper limit of the number of times of bending deformation.

For example, as shown in FIG. 9, the web part is crushed by the lower roll 3j, the arm part is crushed by the upper roll 2i, the web part is crushed by the lower roll 3k, and the arm part is crushed by the upper roll 2j.
However, when the arm part or the web part is continuously reduced at least twice with the adjacent correction roll, the angle of the flange part with respect to the web part changes, and the deformation in the cross section (illustrated in FIGS. 6 and 7). This is preferable because it is possible to suppress the occurrence of the bending and to more effectively impart the bending deformation necessary for correction.

  8A and 8B show a case where the arm portion or the web portion is crushed by the adjacent upper and lower straightening rolls. FIG. 8A shows a case where the web portion is crushed and FIG. 8B shows a case where the arm portion is crushed.

  In FIG. 8A, the web portion is continuously crushed by the adjacent upper roll 2e and the lower roll 3g, and in FIG. 8B, the arm portion is continuously crushed by the adjacent upper roll 2g and lower roll 3i.

  In the case of FIG. 8 (a), the U-shaped steel sheet pile is selectively bent in the upward warping direction (downward reduction) between the three straightening rolls of the lower roll 3f, the upper roll 2e and the lower roll 3g. ) Is added, a bending back deformation (upward reduction) in the downward warp direction is selectively applied to the web portion between the three straightening rolls of the upper roll 2e, the lower roll 3g, and the upper roll 2f. In the case of FIG. 8B, the arm portion is similarly pressed down.

  In the present invention, it is sufficient that at least one bending deformation is applied independently to the web portion and the arm portion in the bending deformation multiple times for roll correction, and the web portion and the arm portion are simultaneously pressed down. Is not excluded.

  Further, when the arm portion or the web portion is rolled down, it is more preferable that the joint portion is constrained from the outer end side so that bending deformation is effectively applied so that the dimension in the width direction of the U-shaped steel sheet pile does not fluctuate.

  A roller straightening device suitable for the roller straightening method according to the present invention will be described. A plurality of roller straightening devices are arranged in the material passing direction so that the upper roll and the lower roll are staggered in the vertical direction.

  The height of the roll center part of the upper roll is all the same, the height of the roll center part of the lower roll can be individually adjusted, and the amount of bending deformation: plastic strain applied to the web part or arm part is adjusted.

  As described above, in order to efficiently apply the bending and bending back deformation, it is preferable to continuously reduce the web portion or the arm portion at least twice, and in this case, the correction to reduce the web portion or the arm portion. The rolls are arranged adjacent to each other, for example, an upper roll that lowers the web part and a lower roll that lowers the web part.

  However, the effect of the present invention is not impaired even if a part of the correction roll that simultaneously reduces the web part and the arm part is used.

The straightening roll is preferably configured by fitting a plurality of sleeves to the arbor so that the web portion or the arm portion can be selectively reduced in the cross-sectional shape of the U-shaped steel sheet pile.
On the roll surface (rolled surface) of the sleeve, the shape of the web portion or the arm portion, which is a partial shape of the cross section of the U-shaped steel sheet pile, is engraved.

  Further, the roll diameter (outer diameter) of the sleeve is a dimension capable of applying a rolling force to the web portion or the arm portion. The sleeve is fitted to the arbor so that its roll surface follows the cross-sectional shape of the U-shaped steel sheet pile.

  FIG. 2 is an example of a straightening roll that rolls down the web part, schematically showing the cross-sectional shape when the upper and lower rolls are combined, (a) is the basic structure, (b) is the dimensional variation of the full width of the U-shaped steel sheet pile. In order to prevent, the thing which provided the restraint part is shown.

  In the case of the basic structure shown in FIG. 2A, the upper arbor 4 has an upper roll sleeve 5 for reducing the web portion of the U-shaped steel sheet pile 1, and the lower arbor 6 has a lower roll sleeve 7 for reducing the web portion. It is mated.

  Fig. 2 (b) shows a lower arbor 6 fitted with a lower roll sleeve 7 that squeezes the web portion and an outer support arm 8 and a support sleeve 8 that suppresses expansion deformation of the U-shaped steel sheet pile 1 in the full width direction. Shows what was combined.

  The support sleeve 8 has an outer diameter dimension that abuts against the arm portion and the joint portion and supports from below when the deformation of the arm portion and the joint portion exceeds a predetermined deformation amount, and prevents the expansion deformation in the full width direction. The outermost part of the joint has a shape that abuts from the outside to enhance the bending correction effect.

  FIG. 3 is a straightening roll for rolling down the arm portion, schematically showing a cross-sectional shape when the upper and lower rolls are combined, (a) is a basic structure, (b) is a web portion for preventing deformation of the web portion. (C) shows what provided the restraint part for preventing the dimensional fluctuation | variation of the full width of a U-shaped steel sheet pile.

  In the case of the basic structure shown in FIG. 3A, the upper arbor 4a is fitted with a sleeve 9 for reducing the arm portion of the U-shaped steel sheet pile 1, and the lower arbor 6a is fitted with a sleeve 10 for reducing the arm portion.

  FIG. 3B shows a case where the support sleeve 11 that further supports the web portion and the flange portion from below is fitted to the lower arbor 6a in the straightening roll having the basic structure shown in FIG.

  Since the deformation amount of the web portion and the flange portion in the U-shaped steel sheet pile 1 is within a predetermined range, the support sleeve 11 abuts on the web portion and the flange portion only when the deformation amount exceeds the predetermined amount. Dimensional shape to support from.

  FIG. 3 (c) shows a sleeve 10 for rolling down the arm part and a joint part on the outer side of the straight roll having the basic structure shown in FIG. 3 (a), and the U-shaped steel sheet pile 1 is expanded in the full width direction. The width restraint support sleeve 12 that suppresses deformation is fitted to the lower arbor 6a.

  When the deformation of the arm portion and the joint portion exceeds a predetermined deformation amount, the support sleeve 12 abuts on the arm portion and the joint portion and has an outer diameter dimension that is supported from below, and prevents the expansion deformation in the full width direction. The outermost part of the joint has a shape that abuts from the outside to enhance the bending correction effect.

  In the case of using a roll that simultaneously reduces the web portion and the arm portion as a part of the correction roll, for example, a cross-sectional shape shown in FIG. 4 is used. The upper arbor 4b has a sleeve 5a for lowering the web portion of the U-shaped steel sheet pile 1 and an upper roll sleeve 9a for lowering the arm portion. The lower arbor 6b has a sleeve 7a for lowering the web portion and a lower roll for lowering the arm portion. A sleeve 10a is fitted.

  When the sleeve is fitted to the arbor via a rotating bearing using a bearing or the like, a roller correcting device in which the rotation speed cannot be set individually for each roll is used, and a roll for selectively reducing the web portion and the arm portion is disposed. In such a case, it is preferable that the difference in peripheral speed between the web portion reducing sleeve and the arm portion reducing sleeve can be eliminated, and scuffs generated on the surface of the product (U-shaped steel sheet pile) can be prevented.

  It is also effective in the case where both the web part and the arm part are simultaneously rolled down with one straightening roll.

Roller correction was performed using a U-shaped steel sheet pile shown in FIG. The U-shaped steel sheet pile 100 has a product length of 15 m, a web portion 101 (plate thickness t _w : 10.8 mm), a flange portion 102 (plate thickness t _f : 8.0 mm), and between the flange portion 102 and the joint portion 104. It has an arm part 103 (plate thickness t _b : 10.0 mm), the maximum width dimension on the left and right is the total width W: 935 mm, and the vertical dimension is the total height h: 231 mm.

  The warp shape before correction is an upward warp shape of about +5 to +10 mm per 1 m of the web part (+ is upward warp, − is downward warp), and the arm part is warped in the longitudinal direction at the front and rear ends. In contrast, a warpage difference of about ± 5 mm at maximum per 1 m occurred.

  The roller straightening apparatus has a roll arrangement shown in FIG. 1 and has a structure in which four upper rolls and five lower rolls are arranged, and all straightening rolls are fitted with sleeves in the arbor.

  Table 1 shows the amount of warpage (mm) for a product length of 1 m before and after correction. + Indicates warping and-indicates downward warping.

  In Example 1 of the present invention, the web reduction sleeve and the arm part reduction sleeve were incorporated in all the correction rolls (upper and lower rolls). The upper rolls 2-1 and 2-2 and the lower roll 3-2 use a web rolling sleeve as a support sleeve and have a diameter that provides a 10 mm gap between the roll surface and the lower surface of the web, and select only the arm part. Squeeze down.

  The upper rolls 2-3 and 2-4 and the lower rolls 3-3 and 3-4 have an arm diameter reduction sleeve as a support sleeve, and an outer diameter that provides a 10 mm gap between the roll surface and the lower surface of the arm portion. The web part is selectively rolled down.

  The lower rolls 3-1 and 3-5 were integrated rolls whose sleeve shape (roll surface) coincided with the reference shape of the product, and the web portion and the arm portion were simultaneously rolled down.

  In Example 2 of the present invention, the lower rolls 3-3 and 3-4 are shown in the lower roll of FIG. 2 (b), and support the sleeve and the arm part for selectively rolling down the web part, and the full width of the U-shaped steel sheet pile is expanded. This is a straightening roll incorporating a support sleeve that suppresses this.

  As the lower roll 3-b, a roll incorporating a sleeve shown in the lower roll of FIG. 3C for reducing the arm portion and suppressing the expansion of the full width of the U-shaped steel sheet pile was used. The roll shape of the other straightening rolls was the same as in Example 1 of the present invention.

  In the straightening rolls of Invention Examples 1 and 2, all the upper rolls were fitted with a bearing between the web part pressing sleeve and the upper arbor, and all the lower rolls were fitted with a bearing between the arm rolling lower sleeve and the lower arbor.

  In the comparative example, all straightening (upper and lower) rolls have a roll shape that matches the standard shape of the product, and a sleeve that simultaneously presses down the web portion and the arm portion is incorporated without using a rotary bearing. The arm part reduction sleeve rotates at the same speed.

  In Invention Examples 1 and 2 and Comparative Example, 10 products were roller-corrected, and the warp shape before and after correction was investigated. Table 1 shows the maximum value, minimum value, average value, and variation (standard deviation) 1σ of 10 products.

  In Invention Examples 1 and 2, the amount of warpage of both the web portion and the arm portion was within ± 2 mm / 1 m, and it was possible to reduce variations in the amount of warpage between 10 products.

  In particular, in Example 2 of the present invention, since a sleeve for restraining the outer surface of the product is added to the lower rolls 3-2, 3-3, and 3-4, the amount of warpage of both the web part and the arm part is within ± 1 mm / 1 m. It was possible to make it smaller.

  On the other hand, in the comparative example, the amount of warping of the web could be reduced within ± 2 mm / 1 m, but it was difficult to correct the warping of the web portion and the warping of the arm portion at the same time, and the amount of warping of the arm portion was a maximum of +4 mm. / 1m, minimum (maximum warping) -3mm / 1m, variation 1σ≈2mm.

  In addition, in Examples 1 and 2 of the present invention, the product surface was beautiful, but in the comparative example, rubbing flaws were generated due to the difference in peripheral speed between the roll and the material, and it was necessary to care for wrinkles.

The figure which shows one Example of this invention. It is a figure which shows one Example of this invention, (a) is the up-and-down roll for web parts, (b) is a figure which shows what added the arm part support and the sleeve for width | variety restraint to (a). BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Example of this invention, (a) is the up-and-down roll for arms, (b) is what added the web part support to (a), (c) is a width-constrained sleeve in (a). The figure which shows what was added. The figure which shows one Example of this invention. Conventional example (a diagram showing a roll shape of an integrated roll). The figure which shows the deformation | transformation in rolling of a U-shaped steel sheet pile (in the case of an upper roll). The figure which shows the deformation | transformation in rolling of a U-shaped steel sheet pile (in the case of a lower roll). In the example of the present invention (a diagram showing the arrangement of straightening rolls), (a) shows a case where a web part is rolled, and (b) shows a case where an arm part is rolled. Example of the present invention (a diagram showing the arrangement of straightening rolls). The figure explaining upper curvature. The figure explaining downward curvature. Conventional example (a diagram showing a roll arrangement). Conventional example (a diagram showing a roll shape of a straightening roll). The figure explaining the shape of a U-shaped steel sheet pile.

Explanation of symbols

1 U-shaped steel sheet pile 2a, 200a Upper roll 2b, 200b Same as above 2c, 200c Same as above 2d, 200d Same as above 2e Same as above 2g Same as above 2h Same as above 2i Same as above 2j Same as above 3a, 300a Lower roll 3b, 300b Same as above 3c, 300c Same as above 3d, 300d Same as above 3e, 300e Same as above 3f Same as above 3g Same as above 3h Same as above 3i Same as above 3j Same as above 3k Same as above 4, 4a Upper arbor 5 Upper roll sleeve (for web part pressure reduction)
6,6a Lower arbor
7 Sleeve for lower roll (for web part pressure reduction)
8 Support sleeve 9 Upper roll sleeve (for arm part pressure reduction)
10 Lower roll sleeve (for arm pressure reduction)
DESCRIPTION OF SYMBOLS 11 Support sleeve 12 Width restraint support sleeve 13 Integrated upper roll 14 Integrated lower roll 100 U-type steel sheet pile (conventional example)
101 Web (conventional example)
102 Flange (conventional example)
103 arms (conventional example)
104 Joint (conventional example)
105 Upper roll (conventional example)
106 Lower roll (conventional example)
107 Outer roll (conventional example)

Claims (8)

In a roller correction method for a U-shaped steel sheet pile having an arm portion between a web portion, a flange portion, a joint portion, and a joint portion and a flange portion, the web portion and the arm portion are selectively bent at least once in the longitudinal direction. A method for correcting a roller of a U-shaped steel sheet pile having an arm portion, wherein the deformation is applied independently. 2. The method of correcting a roller of a U-shaped steel sheet pile having an arm portion according to claim 1 , wherein the bending deformation in the longitudinal direction is applied to either the arm portion or the web portion at least twice continuously. 3. The method for correcting a roller of a U-shaped steel sheet pile having arm portions according to claim 1 or 2, further comprising constraining the left and right joint portions from the outside when imparting bending deformation in the longitudinal direction . A roller correction device for a U-shaped steel sheet pile having an arm portion between a web portion, a flange portion, a joint portion, and a joint portion and a flange portion, wherein the web portion or the arm portion is selectively rolled down to the part A roller straightening device for a U-shaped steel sheet pile having arm portions, comprising a straightening roll that selectively imparts bending deformation in the longitudinal direction .   The roller correction device for a U-shaped steel sheet pile having an arm portion according to claim 4, wherein at least two adjacent correction rolls selectively reduce the web portion or the arm portion.   6. The roller straightening device for a U-shaped steel sheet pile having an arm portion according to claim 4, wherein the lower roll of the straightening roll further restrains fluctuations in the width direction of the U-shaped steel sheet pile.   The straightening roll has a plurality of sleeves and an arbor to which the sleeves are fitted, and the sleeves are rolled onto a part of the U-shaped steel sheet pile cross-sectional shape, and the part of the cross-section is rolled down. 7. A roll diameter capable of applying a force, and the sleeve is fitted to the arbor so that the rolling surface is along a cross section of the U-shaped steel sheet pile. The roller correction apparatus of the U-shaped steel sheet pile which has an arm part as described in any one of these.   The roller correction device for a U-shaped steel sheet pile having an arm portion according to any one of claims 4 to 7, wherein a sleeve constituting the correction roll is rotatably attached to the arbor.

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