Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
  • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
  • B21D3/05—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes rectangular to the path of the work
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
  • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
  • B21D3/10—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts between rams and anvils or abutments
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
  • B21D3/14—Recontouring

Definitions

• the present invention relates to a method for correcting a U-shaped steel sheet pile having an arm between a flange portion and a joint portion among U-shaped sheet piles used for civil engineering and construction, for example.
• ⁇ warpage '' refers to a large bend in the direction perpendicular to the sheet pile wall 2 of the U-shaped sheet pile 1 as shown by the symbol C in Fig. 1, and the end bend.
• ⁇ warpage '' refers to a large bend in the direction perpendicular to the sheet pile wall 2 of the U-shaped sheet pile 1 as shown by the symbol C in Fig. 1, and the end bend.
• the total length X is 0.12% or less, and for steel sheet piles exceeding 10 m, the total length is 1 (10 m) x 0.10 + 12 mm or less.
• total length X 0.25% or less, and for those exceeding 10m, (full length-10m) X 0.20% + 25mm or less.
• the correction of such a shape defect is generally performed by a roller straightening machine.
• This roller straightening machine arranges, for example, three rollers below the four upper openings in a staggered manner with respect to the upper rollers. Because of this, the front and rear ends of the steel sheet pile cannot exhibit sufficient straightening effects, especially the warpage of the front and rear ends. It is common to correct.
• Fig. 3 illustrates the straightening operation by the press straightener when the U-shaped sheet pile 1 to be straightened is bent.
• a pressing rod (not shown) for applying a pressing force in the direction of the arrow through the jig 5 is provided, and on the opposite side, as shown in the drawing, a U-shaped steel sheet pile as a material to be corrected
• Two jigs 6 and 8 that support one flange outer surface 4 of 1 are installed to restrain the movement of the material to be corrected.
• Japanese Patent Application Laid-Open No. 61-63316 discloses a U-shaped steel sheet pile.
• a joint restraint portion for restraining a joint portion of a U-shaped steel sheet pile is provided adjacent to both sides of the straightening portion of the upper straightening roller. It has been proposed.
• a similar proposal is also made in Japanese Patent Application Laid-Open No. 55-70418.
• a straightening roller 10 for a U-shaped steel sheet pile includes straightening rollers 10a, 10b and a low-roller, which are separated from the outer portion of a rib 12, a flange 14, and a joint 16 respectively. It is designed so that it can be corrected by bending correction that repeats up and down, left and right bending while constrained by the la 18, and that the dimensions of the entire width of the product can be adjusted by rollers 18 that constrain the outside of the joint 16. As described above, since the bending and straightening are performed while restraining the tube portion and the flange portion, the sectional shape of the product is straightened without being deformed.
• a first object of the present invention is to provide a novel straightening method and a jig used for the same, which solve the drawbacks of the conventional method for correcting the "bending" of the U-shaped steel sheet pile in the left-right direction and the jig used for straightening. It is to be.
• a specific object of the present invention is to provide a steel sheet pile having high bending stiffness in the lateral direction, such as a U-shaped steel sheet pile having an arm portion between a flange portion and a joint portion (claw portion).
• An object of the present invention is to provide a straightening method capable of efficiently correcting "bending" and a jig used for the straightening method.
• a second object of the present invention is to provide a roller straightening method capable of straightening a U-shaped sheet pile having an arm portion without deforming a cross-sectional shape when correcting the roller.
• the present inventors conducted various studies on the problem that the angle between the flange portion and the joint portion differs from the target angle when correcting the warpage of the U-shaped steel sheet pile having the arm portion with the roller. It is not sufficient to simply restrict the entire web section and flange section only in cross-section, and it is not sufficient to provide cross-section restriction including the arm section, and preferably, the web section and the flange section.
• the present invention was completed by finding that such a correction of the arm portion can be performed with high accuracy by integrating the rollers for restraining the flange portion and the arm portion with both the upper and lower portions.
• the present invention relates to a method for correcting a lateral bending generated in a hot rolling process of a U-shaped steel sheet pile, wherein the outer face of one side flange of the steel sheet pile is pressed while the other flange is pressed.
• the present invention provides a first jig having a surface for pressing an outer surface of a flange on one side of a U-shaped steel sheet pile, and further connected to the first jig and the other jig.
• a second jig for pressing the inner surface of the flange can be attached to and detached from a first jig having a surface for pressing the outer surface of the flange of the U-shaped steel sheet pile.
• a functional fitting portion may be provided at a connecting portion between the two jigs.
• the U-shaped sheet pile has a surface for pressing the outer surface of the flange.
• An adjustment mechanism capable of changing the relative position in the product width direction of the second jig that presses the inner surface of the flange with respect to the first jig may be provided at a connection portion between the two jigs.
• the present invention relates to a method for correcting a roller of a U-shaped steel sheet pile, comprising a rib portion, a flange portion, and a joint portion, and having an arm portion between the joint portion and the flange portion.
• a straightening roller for restraining the arm from above and below, and preferably a straightening roller in which the upper and lower rollers are integrated are used, in addition to the arm and flange. Roller straightening method for U-shaped steel sheet pile.
• a straightening roller that constrains from an up-down direction at an angle different from the product cross section may be used:
• the straightening roller for straightening the U-shaped steel sheet having the arm by repeatedly bending the upper and lower sides and the left and right sides thereof is provided on the upper side of the U-shaped steel sheet pile. It consists of a constraining roller and a lower constraining roller, in which the upper and lower rollers are arranged in a staggered manner.
• Figure 1 is a schematic illustration of the warpage of steel sheet piles.
• FIG. 2 is a schematic explanatory view of bending of a sheet pile.
• FIG. 3 is a schematic explanatory view of a method for straightening steel sheet pile bending press.
• Fig. 4 (a) is an illustration of the width reduction when straightening steel sheet piles
• Fig. 4 (b) is an illustration of the local deformation of the flange:
• FIG. 5 is an explanatory diagram of a conventional roller straightening method for a U-shaped steel sheet pile.
• C FIG. 6 is an explanatory diagram of a conventional roller straightening method for a U-shaped steel sheet pile having an arm portion.
• FIG. 7 is an explanatory diagram of the press straightening method according to the present invention.
• FIG. 8 is an explanatory diagram of an example of the press straightening jig of the present invention.
• FIG. 9 is an explanatory view of another embodiment of the press straightening jig of the present invention.
• FIG. 10 is an explanatory diagram of an example of an arrangement of a U-shaped steel sheet pile having an arm and a straightening roller according to the present invention.
• FIGS. 11 (a) and 11 (b) are explanatory views of a vertical straightening roller according to the present invention of a U-shaped steel sheet pile having an arm portion.
• FIG. 12 is an explanatory view of a cross-sectional shape of a U-shaped steel sheet pile when straightening the upper roller.
• Fig. 13 is an explanatory diagram of the cross-sectional shape of the U-shaped sheet pile when the lower roller is straightened.
• Fig. 14 is a graph showing the relationship between the angle of the flange and the arm in the longitudinal direction .: Fig. 14 is a graph showing the total width variation in the longitudinal direction.
• Fig. 16 is a graph showing the relationship between the angle of the flange portion and the arm portion in the longitudinal direction.
• Fig. 17 is a graph showing the total width variation in the longitudinal direction. Best form for
• the pressing force for pressing 23 may be the same or slightly different.
• Product width fluctuations To prevent local deformation of the flange, press both sides with the same presser as much as possible. It is preferable to:
• FIG. 8 illustrates an example of a jig used in the straightening method according to the present invention.
• the jig is brought into contact with the outer surface 22 of the flange 21 of the U-shaped steel sheet pile 20 as a material to be straightened and pressed.
• a second jig 25 for contacting and pressing a second jig 25 for contacting and pressing.
• the first jig is simply referred to as jig A
• the second jig is referred to as jig B.
• the jig A and the jig B are appropriately connected by a connecting portion 26.
• the screw holes provided on the jig B side are provided.
• the bolt 28 may be fixed.
• an integral structure may be used, but other than that, simple fitting, connection by a pin and a pin hole, and the like are also conceivable.
• the above-mentioned fitting screw type has a more simple and reliable structure.
• the same press force is applied to the jigs A and B by applying a presser in the direction of the arrow to the press ram head connecting portion 29 provided on the jig A on the base in the illustrated example.
• the correction method of the present invention is performed by pressing both flange surfaces in addition to the same direction.
• the jig A and the jig B are configured so that they can be attached and detached at the connecting part in the illustrated example in order to facilitate handling, but of course, they may be integrated.
• a margin is provided at a fitting portion between the two jigs so that the jigs A and B are provided in the width direction of the product. It may be configured such that the relative position between the tool and the jig B can be adjusted. As a result, the press force when simultaneously pressing the outer surface of the flange and the inner surface of the other flange is appropriately distributed according to the dimensional variation (width variation) of the material to be straightened, and local deformation of the material to be rolled is reduced. Bending straightening can be performed efficiently without causing
• the connecting portion 26 between the jig A 24 and the jig B 25 is a kind of a slide type, which can be finely adjusted in the direction of the arrow, and
• a screw-type fixing mechanism (not shown) may be provided.
• the U-shaped steel sheet pile 20 travels on the transport roller R and comes to a predetermined position as shown in FIG. At first, it is fixed by a jig composed of a combination of jigs A and B, and then a pressing force is applied in the direction shown in the figure.
• the fixing position of the jig at this time is shown in Fig. 3, for example. In this way, one piece is attached to the press pressing side and two pieces are attached to the support side of the material to be corrected.
• a specific correction operation may be performed in the same manner as the conventional correction operation, further description is omitted.
• Fig. 8 shows an example of a U-shaped steel sheet pile that has an arm between the joint (claw) and the flange. It may be a sheet pile, and it can be implemented only by slightly changing the jig shape according to the product shape. I is the same.
• the U-shaped posture is shown as the posture of the material to be corrected. However, the same applies to the inverted u-shaped posture, and the jig is turned upside down in accordance with the shape of the material to be corrected. You just need to flip it.
• FIG. 10 is an explanatory view of the arrangement of a straightening roller for a U-shaped steel sheet pile having an arm as an example of the straightening roller according to the present invention.
• a U-shaped steel arrow having a rib 30, a flange 32, an arm 34, and a joint 35 is provided by upper rollers 36, 36, lower rollers 38, 38, and an outer roller 40. Arms are constrained in addition to ribs and flanges.
• both the upper and lower straightening rollers 36 and 38 are integrally formed so that the web portion 30 and the flange portion 32 can be restrained by the same roller.
• the angle between the arm part 34 and the flange part 32 is different from that of the final product. It is repeatedly bent and straightened by attaching a taper to the part where the arm part 34 of the rollers 36 and 38 is restrained. May be corrected to the same angle as the product c
• FIGS. U (a) and (b) are schematic views of an example of the straightening roller according to the present invention in such a case. The difference is that the rollers 36 and 38 are provided with a taper having an angle ⁇ , respectively, as compared with the field base of FIG.
• ⁇ The base of the force using the straightening roller that restrains the arm from the vertical direction in addition to the X and flange parts (in particular, Fig. 11 (a), (1))
• a straightening roller is used to restrain the arm between the flange and the joint at an angle different from the cross section of the product and from the top and bottom.
• the upper and lower rollers 36 and 38 are drawn as if the respective rollers were aligned in the vertical direction. Actually, the upper and lower rollers are staggered. .
• the arm and the web and the flange are restrained together, preferably from above and below, by the same roll. It can be corrected without impairing the cross-sectional shape of the product as in the case of 3.
• the entire cross-section except for the joints with a roll-hole type, it is possible to effectively correct not only the vertical warpage of the U-shaped sheet pile but also the slight lateral bending.
• a U-shaped steel sheet pile having an arm with high rigidity against bending and warping as compared with a U-shaped steel sheet pile having no arm can also be subjected to the press straightening or the mouth straightening. This makes it possible to easily remove the slight bending and vertical warpage, while maintaining a constant angle of the arm.
• the material to be straightened is intermittently fed in the longitudinal direction at a pitch of 1.2 m every time the press is straightened.
• the method of repeating the work was adopted.
• a jig used in the press straightening method according to the present invention a combination of two jigs (jig A and jig B) as shown in FIG. 8 was employed. Correction by the conventional method, which corrects left and right bends with jig A alone, was also performed.
• Table 2 shows a comparison of the product left and right bending levels after the straightening method of the present invention and the conventional straightening method.
• the bending was significantly reduced before and after the straightening according to the press straightening method of the present invention, whereas the bending level was substantially reduced before and after straightening with the conventional press straightening method.
• the product width is defective. Defects have occurred due to local deformation of the flange.
• the dimensions of the material to be straightened are as shown in Table 3.
• the right and left bends that could not be completely removed by the roller straightening in the previous process were straightened at both ends (approximately 1.2 m each) of the material to be straightened.
• the press straightening of the present invention was carried out in order to perform the same, but the other conditions were the same as in Example 1.
• Table 4 shows a comparison of the product left and right bending levels after straightening by the straightening method of the present invention and the conventional straightening method. From the results shown in this table, according to the press straightening method of the present invention, compared to the conventional press straightening method, the bending before and after straightening is greatly reduced, and the straightening is realized in a short time. According to the straightening method of the present invention, it is understood that the straightening can be efficiently performed.
• the U-shaped dwarf method according to the present invention was applied to a U-shaped steel sheet pile having an arm portion between a joint portion and a flange portion.
• Fig. 14 shows the relationship between the angle of the flange and the arm in the longitudinal direction
• Fig. 15 shows the relationship of the total width variation in the longitudinal direction.
• FIG. 14 is a graph showing the length in the longitudinal direction of the U-shaped steel sheet pile (the amount of change d e g r e e before and after correction of the angle of the arm with respect to L J).
• ⁇ the amount of change d e g r e e before and after correction of the angle of the arm with respect to L J.
• FIG. 15 is a graph comparing the length (L o) of the U-shaped sheet pile in the longitudinal direction (L o) with respect to the variation ( ⁇ ⁇ ) before and after the correction of the dimension of the entire width (W o).
• ⁇ is a comparative example, and in this case, there is no substantial variation in the present invention example.
• the angle between the flange portion and the arm portion, and the dimension of the entire width hardly fluctuate, and good results are obtained.
• Figure 16 shows the change in the length in the longitudinal direction () and the amount of change before and after the correction of the angle of the arm.
• Figure 17 shows the relationship between the length in the longitudinal direction () and the change in the total width (Wo) before and after the correction.
• Each is shown by a graph.
• Hata does not have a taper
• "" indicates a case where a tapered roller is used.
• the use of the press dwarfing method and the straightening jig according to the present invention makes it possible to straighten a U-shaped sheet pile in a short time and efficiently, and particularly to a U-shaped steel sheet having an arm. Even for steel sheet piles such as sheet piles that have a cross-sectional shape with large bending rigidity in the lateral direction, press dwarfing can be performed effectively without causing product defects, and their industrial utility value is extremely large.
• the roller can be straightened without deforming the cross-sectional shape (full width, angle between the flange and the arm).

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bulkheads Adapted To Foundation Construction (AREA)
• Metal Rolling (AREA)
• Straightening Metal Sheet-Like Bodies (AREA)
• Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Priority Applications (4)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26541385

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (9)

Citations (6)

Family Cites Families (1)

• 1996
  • 1996-09-18 KR KR1019970703572A patent/KR100480243B1/ko not_active IP Right Cessation
  • 1996-09-18 EP EP03002697A patent/EP1338351B1/de not_active Expired - Lifetime
  • 1996-09-18 EP EP96931237A patent/EP0795364B1/de not_active Expired - Lifetime
  • 1996-09-18 AU AU70003/96A patent/AU692404B2/en not_active Expired
  • 1996-09-18 CN CN96191140A patent/CN1073893C/zh not_active Expired - Lifetime
  • 1996-09-18 DE DE69630670T patent/DE69630670T2/de not_active Expired - Lifetime
  • 1996-09-18 WO PCT/JP1996/002680 patent/WO1997012701A1/ja active IP Right Grant
  • 1996-09-18 DE DE69638361T patent/DE69638361D1/de not_active Expired - Lifetime
  • 1996-09-18 CN CNB011030518A patent/CN1159120C/zh not_active Expired - Lifetime
  • 1996-09-23 TW TW085111615A patent/TW346422B/zh not_active IP Right Cessation

Patent Citations (6)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events