JP2007237276A - Method of manufacturing sheet-pile product having larsen type joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of stably manufacturing the joints of a sheet-pile product by stabilizing the engaging position of an intermediate material in the finishing work of the sheet-pile product having Larsen type joints with a pair of double rolls with which a groove is constituted. <P>SOLUTION: In the method of manufacturing the sheet-pile product having the Larsen type joints from a base stock by rolling and bending forming by using the grooves which are carved on a series of the pair of the double rolls, by performing the bending forming to the equivalent parts to the joints of the intermediate material of the sheet-pile product by applying force approximately vertical to the pitch line of the pair of the double rolls, the sheet-pile product having the Larsen type joints is formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sheet pile product (hereinafter referred to as a sheet pile product) having a Larsen type joint used as a structural member for use in, for example, underground earth retaining in the field of civil engineering, foundation structures and seawalls in harbor rivers, and still water walls in the ground. The manufacturing method of the above.

  For example, a steel U-type sheet pile product, that is, a so-called U-type steel sheet pile product, is manufactured by a process as shown in FIG. That is, after heating the raw material 11 having, for example, a rectangular cross-sectional shape 11a to a predetermined temperature by the heating furnace 1, a breakdown rolling mill 2 having a pair of double rolls constituting a hole mold (hereinafter also referred to as a rough rolling mill 2). Thus, the rough steel piece 12 having the cross-sectional shape 12a is formed. Furthermore, after forming the intermediate material 13 having a cross-sectional shape 13a from the rough steel pieces 12 by the intermediate rolling mills 3 and 4 each having a pair of double rolls constituting a hole shape, a double shape constituting the hole shape is formed. A sheet pile product 14 having a U-shaped cross-sectional shape 14a is obtained by bending a part of the joint-corresponding portion 13-7 of the intermediate member 13 by the finishing mill 5 having a roll pair.

  FIG. 9 shows a modeling process after the breakdown rolling mill 2. The material 11 is generally a bloom or slab having a rectangular cross-sectional shape 11a. First, about 2 to 3 hole molds are usually arranged in the double roll pair of the breakdown rolling mill 2, and a rough steel slab having a cross-sectional shape 12 a is formed from the material 11 by rolling sequentially with these hole molds. 12 is formed. Next, the intermediate material 13 having a cross-sectional shape 13a is formed from the rough steel piece 12 by usually about 4 to 5 hole molds arranged in the intermediate rolling mills 3 and 4. Finally, a sheet pile product 14 having a U-shaped cross-sectional shape 14a is formed by a hole mold (hereinafter referred to as a finish hole mold) engraved in the pair of double rolls 5-1 and 5-2 of the finishing mill 5. Here, the intermediate member 13 is “a cross section immediately before the sheet pile product 14, and the thickness of each portion of the cross section is substantially equal to the thickness of the corresponding portion of the sheet pile product 14, and the shape is different from the sheet pile product 14. “Material”.

  Hereinafter, the situation in which the sheet pile product 14 is formed from the intermediate material 13 by the finish hole mold engraved in the double roll pairs 5-1 and 5-2 of the finish rolling mill 5 will be described in detail.

First, define the x-coordinate as shown in FIG. 10, the plane passing through the central axis O ₁ and the center axis O ₂ of the lower roll 5-2 on rolls 5-1 of the finishing mill 5 with respect to the rolling upstream To do. O is a straight line perpendicular to the plane located in the middle of the center axis O ₁ and the center axis O ₂ called pitch line. The shape of a cross section (hereinafter referred to as the x cross section) obtained by cutting the finished hole mold composed of the double roll pairs 5-1 and 5-2 and the material to be rolled by a plane perpendicular to the rolling direction at the position x = x. Is shown in FIG. (A), (b), and (c) of FIG. 11 show an x ₁ cross section, an x ₂ cross section, and a 0 cross section (x ₁ > x ₂ > 0), respectively. (C) expands and shows the joint cross section of each to-be-rolled material of FIG. 11 (a), (b), (c), respectively. In FIG. 11, the broken line indicates the cross section of the finishing hole mold, and the solid line indicates the cross section of the material to be rolled. From these figures, it can be seen that the sheet pile product 14 is formed from the intermediate material 13 using the finishing hole mold. X ₁ cross-section of (a) is a position where the intermediate member 13 contacts the first roll entry side of the finishing mill 5, after a x ₂ cross-section of (b), sheet pile products 14 0 cross section of (c) Is formed. The intermediate material 13 has the web 13-1 and the flange 13-2 slightly reduced in thickness, and the joint bottom 13-3 is pushed down by the horizontal plane A part of the upper roll 5-1, so that the lower roll 5-2 The substantially vertical plane B part receives a bending moment such that the claw 13-4 bends in a direction substantially parallel to the pitch line O. As a result, the claw 13-4 rotates around the connecting portion 13-5 with the joint bottom 13-3 (that is, the outer edge end portion 13-5 of the joint bottom 13-3) as shown in FIG. Fourteen joints 14-7 are formed.

  Thus, the method of manufacturing a sheet pile product by the hole type | mold comprised by the double roll pair of each rolling mill of the breakdown rolling mill 2, the intermediate rolling mills 3, 4, and the finishing rolling mill 5 has been performed widely from old times. For example, Patent Document 1 and Patent Document 2 are known.

JP-A-60-44101 JP 59-64101 A

  The bending of the claws 13-4 of the intermediate material 13 by the finishing hole mold composed of the double roll pairs 5-1 and 5-2 of the finishing mill 5 performed at the end of the process shown in FIG. It is known that a shape defect is likely to occur in the joint 14-7 of the sheet pile product 14 due to being performed by applying a force in a direction parallel to the pitch line O as in FIG.

  As shown in FIG. 13 (c), the shape of the joint bottom 13-3 does not become horizontal, and neither the joint bottom 13-3 nor the claw 13-4 fits properly into the finished hole mold. The shape is poor. Hereinafter, the reason why such a shape defect is likely to occur will be described in detail with reference to FIGS. 11 and 13.

In bending the joint shown in FIG. 11, first x ₁ intermediate member 13 is in cross section in contact with the lower roll 5-2 B section, a horizontal direction (i.e. pitch line O of the claw 13-4 by B section from the moment Bending in a direction parallel to However, at this time, the intermediate member 13 is not yet in contact with the upper roll 5-1, and there is a horizontal gap of at least δ between the intermediate member 13 and the upper roll 5-1. Therefore, slight asymmetry of the cross-sectional shape of intermediate member 13, or the like biting slight lateral direction of displacement of the intermediate member 13, intermediate member 13 is lower roll 5 in x ₁ cross-section as shown in FIG. 13 (a) -2 contacts asymmetrically. That is, it is normal for the intermediate member 13 to come into contact with the lower roll 5-2 at a normal position U as shown by a thin solid line, but the lower roll is twisted as shown by a thick solid line or shifted in a lateral direction V. Contacting 5-2 often occurs. Thus, when the intermediate member 13 is guided to finish the caliber in a state biased to the left in the x ₁ cross section, FIG. 13 (b), the (c), the material to be rolled, for example, in x ₂ cross The point 13-D of the right side flange moves to the boundary point 13-C between the web 13-1 and the flange 13-2 in the zero cross section, and deviates from the original position 13-D. As a result, in the 0 cross section, the flange 13-2 has a short right flange and a long left flange. Since the length of the right flange is shorter than the original length, the joint bottom 13-3 escapes downward, and the part A of the upper roll 5-1 cannot press the joint bottom 13-3. Will be inclined.

  The problem to be solved by the present invention is to stably manufacture the sheet pile product 14 by stabilizing the biting posture of the intermediate sheet 13 when finishing the intermediate sheet 13 of the sheet pile product 14 having the Larsen type joint. An object of the present invention is to provide a method for manufacturing a sheet pile product having a Larsen type joint.

  The inventors of the present invention believe that the cause of the shape defect in the joint 14-7 of the sheet pile product 14 is that the joint corresponding portion 13-7 of the intermediate material 13 is bent before the finishing hole mold is sufficiently restrained by the intermediate material 13. Focused on being in the beginning. In order to improve this, the value of the horizontal gap δ shown in FIG. 11A existing between the intermediate member 13 and the upper roll 5-1 may be made as small as possible. Therefore, we examined the measures for that. There are three possible measures: a measure to change the shape of the finishing hole mold, a measure to change the cross-sectional shape of the intermediate member 13, or a measure to change the diameter of the double roll pairs 5-1 and 5-2. It is done. However, since the shape of the sheet pile product 14 is a given condition, the shape of the finishing hole mold for forming the sheet pile product 14 cannot be changed, and the pair of double rolls 5-1 and 5-2 cannot be changed. Changing the diameter is not easy due to the limitations of the rolling mill. Therefore, it was examined whether the cross-sectional shape of the intermediate material 13 could be made appropriate. As a result, the following knowledge was obtained.

  In order to solve the above problems, according to the present invention, a method of manufacturing a sheet pile product having a Ralzen joint by rolling and bending using a hole mold engraved in a roll pair provided in each of a series of rolling mills. The intermediate material of the sheet pile product is formed from the raw material using a rolling mill that performs rough rolling and intermediate rolling in the series of rolling mills, and the intermediate material is formed using a rolling mill that performs finish rolling. The joint corresponding portion of the intermediate material is bent by applying a force in a direction substantially perpendicular to the pitch line of the roll pair provided in the rolling mill that mainly performs the finish rolling to the joint corresponding portion. There is provided a method for manufacturing a sheet pile product having a Larsen type joint, characterized by forming a sheet pile product having a joint.

  In the manufacturing method of the sheet pile product having the Ralzen type joint, the intermediate material has a configuration in which the joint corresponding parts are provided at both ends of the main body part, and the joint corresponding parts are provided at both ends of the main body part, respectively. It is composed of a joint bottom and a claw connected to the outer edge end of the joint bottom, and when bending the joint corresponding part of the intermediate material, the joint bottom may be bent with respect to the body part. Good.

  In the manufacturing method of the sheet pile product having the above-mentioned Ralzen type joint, when the joint bottom is bent with respect to the main body part of the intermediate material, the joint bottom is rotated about the connection portion between the main body part and the joint bottom. May be bent.

  In the manufacturing method of a sheet pile product having the above-mentioned Ralzen joint, when forming an intermediate material of the sheet pile product from the material, a roll pair provided in a rolling mill in which a joint bottom of a joint corresponding portion of the intermediate material performs the intermediate rolling is provided. You may make it shape | mold so that it may not become parallel with respect to this pitch line.

  In the manufacturing method of a sheet pile product having the above-mentioned Ralzen type joint, when forming an intermediate material of the sheet pile product from the material, an angle formed by the joint bottom and the claw is finally a joint of the sheet pile product to be manufactured. You may make it shape | mold so that it may become substantially the same as the angle which a bottom and a nail | claw make.

  In the manufacturing method of a sheet pile product having the above-described Ralzen joint, any one of a roll surface that applies a force in a direction substantially perpendicular to a pitch line of a roll pair provided in the rolling mill that performs the finish rolling, and a roll surface that faces the roll surface Alternatively, bending of the joint-corresponding portion of the intermediate material may be performed with the lubricant supplied to both.

  By applying the present invention, when manufacturing a sheet pile product having a Larsen type joint, it is possible to reduce the shape defect of the joint of the sheet pile product, to prevent the yield, and to improve the production efficiency. .

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  Below, the manufacturing method of the sheet pile product which has the Larsen type joint concerning the 1st Embodiment of this invention is demonstrated. In the first embodiment of the present invention, a case where a U-shaped sheet pile product 24 is manufactured as a sheet pile product having a Ralzen joint will be described.

  FIG. 1 is a configuration diagram showing a schematic configuration of a manufacturing apparatus 30 for a U-shaped sheet pile product 24 used for carrying out the sheet pile product manufacturing method according to the first embodiment of the present invention. As in the example of FIG. 8 described above, the manufacturing apparatus 30 is used for the heating furnace 1 that heats the material 21 to a high temperature that can be hot-rolled, and for rough rolling that forms the material 21 into a rough steel slab 22. A rough rolling machine 2 having a pair of double rolls (not shown) in which a hole mold is engraved and a pair of double rolls (not shown) in which a hole mold for intermediate rolling for forming a rough steel piece 22 into an intermediate material 23 is formed. Intermediate rolling mills 3 and 4, and finishing mill 5 having double roll pairs 5-1 and 5-2 engraved with a finishing hole mold for rolling and bending the intermediate material 23 into a U-shaped sheet pile product 24, , Is composed. In the present embodiment, the case where the U-shaped sheet pile product 24 is manufactured using the series of four rolling mills 2 to 5 will be described. However, the number of the rolling mills may be other than four. It may be configured as follows.

FIG. 2 shows a pair of double rolls 5-1 and 5-2 of the finishing mill 5 for rolling and bending the intermediate material 23 when the U-type sheet pile product 24 is manufactured by applying the present invention, and the intermediate material. FIG. 12 is a cross-sectional view showing a cross section with the same as the example of FIG. 11 described above. That is, as in the example of FIG. 11 described above, the finishing center axis O ₁ and the rolling upstream direction with respect to the plane including the central axis O ₂ of the lower roll 5-2 on rolls 5-1 of the mill 5 Define the x coordinate. The pitch line O is parallel to the center axis O ₁ and the center axis O _2, a straight line is located between the center axis O ₁ and the center axis O _2. Further, a cross section obtained by cutting the hole mold and the intermediate material 23 composed of the double roll pairs 5-1 and 5-2 shown in FIG. 10 at a position x on the x coordinate along a plane perpendicular to the rolling direction is referred to as an x cross section. (Hereinafter referred to as the x cross section).

2 (a), 2 (b), and 2 (c), the intermediate material 23 contacts the double roll pairs 5-1 and 5-2 on the entry side of the finish rolling mill 5 as in the example of FIG. When the start position is coordinate x ₁ , the position where bending of the intermediate material 23 is started is coordinate x ₂ , and the position where the cross-sectional shape of the intermediate material 23 is finished to the cross-sectional shape of the U-shaped sheet pile product 24 is coordinate 0, The x ₁ cross section, x ₂ cross section, and 0 cross section (x ₁ > x ₂ > 0) of the double roll pairs 5-1 and 5-2 and the intermediate member 23 are shown. (A), (b), and (c) in FIG. 3 are enlarged views of the cross-section of the joint corresponding portion 23-7 of the intermediate member 23 in (a), (b), and (c) of FIG. FIG. However, in order to simplify the illustration, the description of the double roll pairs 5-1 and 5-2 is omitted.

  A manufacturing method according to the first embodiment of the present invention will be described with reference to FIGS. Similarly to the example of FIG. 8 described above, after heating the raw material 21 having, for example, a rectangular cross-sectional shape 21a to a predetermined temperature by the heating furnace 1, a rough rolling mill having a pair of double rolls constituting a rough rolling hole mold. 2 is used to form a rough steel piece 22 having a cross-sectional shape 22a. Next, the rough steel slab 22 was rolled by a series of perforations placed in the intermediate rolling mills 3 and 4, and rolling by the final perforation of the series of perforations (hereinafter referred to as a "perforation immediately before finishing") was completed. In the stage, the intermediate member 23 having the cross-sectional shape 23a shown in FIGS. 2 (a) and 3 (a) is formed.

  Here, the shape of the intermediate member 23 formed from the rough steel piece 22 by the intermediate rolling mills 3 and 4 will be described in more detail. As shown in FIG. 2A, the intermediate member 23 includes a main body portion 23-8 having a configuration in which flanges 23-2 are provided on both sides of a horizontally arranged web 23-1, and the main body portion 23-8. It is comprised by the joint corresponding | compatible part 23-7 provided in the both ends 23-6 (namely, each outer edge edge part 23-6 of the flange 23-2 in the both sides of the web 23-1). In the main body portion 23-8, the flange 23-2 is configured to rise upward on both sides of the web 23-1, and to spread outward as the upper side extends. As shown in FIG. 3A, the joint corresponding portion 23-7 includes a joint bottom 23-3 provided at both end portions 23-6 of the main body portion 23-8, and an outer edge end portion 23 of each joint bottom 23-3. And claw 23-4 connected to -5.

  The joint bottom 23-3 of the intermediate member 23 is provided at a different angle from the joint bottom 24-3 of the U-shaped sheet pile product 24. The angle X formed by the joint bottom 23-3 of the intermediate member 23 and the claw 23-4 is the same as that of the joint bottom 24-3 and the claw 24-4 of the U-shaped sheet pile product 24 finally produced as shown in FIG. It is the same size as the angle Y formed (that is, X = Y). Note that the angle X and the angle Y do not have to be exactly the same size, and the intermediate material 23 may be formed so that they are substantially the same.

The intermediate material 23 thus formed is finished and the intermediate material 23 is deformed in the order of (a), (b), and (c) in FIG. Pressure Namely, after contact with the connecting portion 23-5 upper roll 5-1 joint bottom 23-3 and pawl 23-4 of the intermediate member 23 in _{x 1} cross-section, downwardly, i.e. in the direction perpendicular to the pitch line O It will be done. Next, the squeezed intermediate material 23 comes into contact with the lower roll 5-2, and the joint bottom 23-3 is connected to the joint 23-6 between the flange 23-2 and the joint bottom 23-3 by the pressure of the lower roll 5-2. Is bent so as to rotate about the axis, and the intermediate member 23 is formed into the cross-sectional shape shown in FIG. 2C, whereby the final sheet pile product 24 is manufactured. Incidentally, x ₁ showing the position of the cross-section in FIG. 2 is a position where the first contact with the grooved intermediate member 23 is finish, not necessarily the same value as x ₁ in FIG. 11 or 13.

  Next, the deformation | transformation of the joint corresponding | compatible part 23-7 of the intermediate material 23 at the time of shape | molding the U-shaped sheet pile product 24 from the intermediate material 23 is demonstrated in detail using Fig.3 (a), (b), (c). First of all, how to roll the intermediate material 23 in advance with the hole type just before finishing is a triangle formed by the joint bottom 23-3, the claw 23-4 and the pitch line O of the joint corresponding part 23-7. In this case, both the angle α formed by the joint bottom 23-3 and the pitch line O and the angle β formed by the claws 23-4 and the pitch line O must be smaller than 90 degrees. This condition is necessary to enable the inner and outer surfaces of the joint bottom 23-3 and the claw 23-4 to be reduced with the hole type just before finishing. FIG. 4 is a diagram showing an example of rolling down the inner and outer surfaces of the joint bottom 23-3 and the claw 23-4 with the hole type just before finishing. As shown in FIG. 4, the joint bottom 23-3 and the claw 23-4 of the intermediate member 23 can be crushed from both the upper and lower directions by the double roll pairs 4-1 and 4-2 of the intermediate rolling mill 4 constituting the hole mold just before finishing. .

  In the conventional method shown in FIG. 12, α = 0, but α similarly defined as the angle of the joint bottom 23-3 with respect to the pitch line O in the method of the present invention is α ≠ 0. In other words, the intermediate material 23 is inclined by the immediately preceding intermediate rolling so that the joint bottom 23-3 is not parallel to the pitch line O, and α is set to an angle of less than 90 degrees to set the outer edge of the joint bottom 23-3. The portion 23-5 is formed to be lifted up. Then, a vertical force (that is, a force in a direction perpendicular to the pitch line O) is applied to the outer edge 23-3 of the joint bottom 23-3 on the horizontal plane A of the upper roll 5-1 shown in FIG. The joint bottom 23-3 and the claw 23-4 are rotated around the connecting portion 23-6 between the flange 23-2 and the joint bottom 23-3, and the U-type sheet pile product 24 as shown in FIG. A joint 24-7 is obtained. In the final stage of this process, the claw 23-4 receives almost no bending force vertically from the substantially vertical plane B of the lower roll, so the angle X hardly changes, and the U-shaped sheet pile product to be finally produced. At 24, the angle Y is equal to the angle X as shown in FIG.

  Here, the case where the angle X and the angle Y are equal is shown. However, even if the angle X is not equal to the angle Y, it is sufficient if it is substantially equal. For example, the angle X may be set to be slightly larger than the angle Y depending on the shape of the joint of the U-shaped sheet pile product 24 to be manufactured or manufacturing conditions such as the roll strength constraint of the hole type just before finishing. FIG. 5 is a diagram illustrating an example where the angle X is close to the angle Y but is set slightly larger than the angle Y.

  In FIG. 5, the geometric shape of the joint corresponding portion 23-7 of the intermediate member 23 is formed as, for example, a broken line portion. That is, in order to make the angle X larger than the angle Y, for example, the inclination angle β ′ of the inner surface with respect to the pitch line O of the claws 23-4 of the intermediate member 23 is set smaller than the same inclination angle β in FIG. In finishing, deformation proceeds in the order of (a), (b), and (c) in FIG. In this case, the outer edge end 23-5 of the joint bottom 23-3 of the intermediate member 23 is pushed down by the horizontal surface A of the upper roll 5-1 shown in FIG. 2, thereby connecting the flange 23-2 and the joint bottom 23-3. The joint bottom 23-3 and the claw 23-4 are rotated around the portion 23-6. In addition, when the claw 23-4 is pushed up by the horizontal surface C of the lower roll 5-2, the claw 23-4 is slightly rotated around the outer edge 23-3 of the joint bottom 23-3, and the angle X Becomes the angle Y shown in FIG. 5C, and the shape of the joint 24-7 of the U-shaped sheet pile product 24 is finally determined. That is, by applying a force in a direction substantially perpendicular to the pitch line O from the horizontal plane A of the upper roll 5-1 and the horizontal plane C of the lower roll 5-2 to the joint corresponding portion 23-7 of the intermediate member 23, a U-shaped sheet pile product. Twenty-four joints 24-7 are formed. In this way, by applying a force to the intermediate member 23 in a direction substantially perpendicular to the pitch line O, molding is mainly performed to bend the joint bottom 23-3 with respect to the main body portion 23-8 (that is, the flange 23-2). At the same time, the angle formed by the joint bottom 23-3 and the claw 23-4 may be adjusted.

  It should be noted that the reason why the expression “direction substantially perpendicular to the pitch line O” and “almost” is used instead of “direction perpendicular to the pitch line O” as described above will be described. For example, when the outer surface of the joint bottom 24-3 or the claw 24-4 of the U-shaped sheet pile product 24 to be manufactured is inclined, the horizontal surface A of the upper roll 5-1 or the lower roll is naturally matched to the inclined shape. The shape of a part or the whole of the substantially vertical plane B and the horizontal plane C of 5-2 is determined. In such a case, the force applied for bending the joint corresponding portion 23-7 of the intermediate member 23 is not only the component force in the direction perpendicular to the pitch line O but also parallel to the pitch line O. It consists of various components. Specifically, in the example of FIG. 2, the lower roll 5-2 has a substantially vertical surface B that is slightly inclined in accordance with the outer surface shape of the claw 24-4 of the U-shaped sheet pile product 24. At this time, the claw 24-4 receives a force slightly inclined with respect to the direction perpendicular to the pitch line O as indicated by an arrow F in FIG. However, the force applied to the intermediate member 23 by the roll pairs 5-1 and 5-2 during the finishing process is mostly composed of a component force in a direction perpendicular to the pitch line O. That is, the component force parallel to the pitch line O is negligibly smaller than the component force perpendicular to the pitch line O. Assuming such a phenomenon, the expression “almost” is used in this specification.

  In the present embodiment, the horizontal surface A of the upper roll 5-1 that presses the outer edge end 23-5 of the joint bottom 23-3 of the intermediate member 23, and the substantially vertical plane of the lower roll 5-2 that presses the claw 23-4. The processing shown in FIG. 3 or FIG. 5 is performed in a state in which a lubricant such as lithium grease is supplied to B and the horizontal surface C and the like and lubricated. Thus, when the U-shaped sheet pile product 24 is formed from the intermediate material 23, the friction coefficient between the roll surfaces of the upper and lower roll pairs 5-1 and 5-2 and the friction surface of the intermediate material 23 is reduced. It is possible to smoothly perform the bending of the 23 joint corresponding parts 23-7.

  According to the above embodiment, when the sheet material such as the U-shaped sheet pile product 24 is manufactured by rolling and bending the intermediate material 23, the pair of upper and lower rolls 5-1 of the finish rolling mill 5 that performs finish rolling. 5-2, the joint corresponding portion 23-7 of the intermediate member 23 is bent by applying a force in a direction substantially perpendicular to the pitch line O to the joint corresponding portion 23-7 of the intermediate member 23. As a result, the intermediate member 23 can be bent and fixed without escaping in a direction parallel to the pitch line O, and the joint 24-7 of the manufactured sheet pile product 24 has a shape defect. It is possible to prevent the occurrence. As a result, production efficiency can be increased.

  Further, by forming the joint bottom 23-3 of the joint corresponding portion 23-7 of the intermediate material 23 by the finish rolling mill 5 so as not to be parallel to the web 23-1, the intermediate material 23 is rolled. Immediately after entering between the pair 5-1 and 5-2, the roll surface of the roll pair 5-1 and 5-2 can be brought into a stable posture, and the joint 24-7 of the sheet pile product 24 to be manufactured can be made. It is possible to prevent the occurrence of shape defects.

  Further, the angle X formed by the joint bottom 23-3 and the claw 23-4 of the intermediate member 23 and the angle Y formed by the joint bottom 24-3 and the claw 23-4 of the U-shaped sheet pile product 24 are formed substantially the same. By doing so, it becomes possible to simplify the bending of the joint corresponding portion 23-7 of the intermediate member 23. That is, the bending forming of the joint corresponding portion 23-7 of the intermediate material 23 by the finishing mill 5 is mainly performed by connecting the joint bottom 23-3 and the claw 23-4 to the flange 23-2 and the joint 23-3 of the joint bottom 23-3. Therefore, the bending work performed by the finishing mill 5 can be simplified and the generation of defective products can be reduced.

  As a second embodiment of the present invention, a hat-type sheet pile product 34 may be manufactured instead of the U-type sheet pile product 24. 6 (a) and 6 (b) are diagrams showing a hat-type sheet pile product 34 and its intermediate member 33 manufactured by the manufacturing method according to the second embodiment of the present invention. Fig.7 (a) is sectional drawing which shows the finishing hole type | mold of the finishing mill 5 'used for enforcing the manufacturing method which concerns on the 2nd Embodiment of this invention. FIG.7 (b) is sectional drawing which shows the hole type just before finishing of the intermediate rolling mill 4 'used for enforcing the manufacturing method concerning the 2nd Embodiment of this invention.

  As shown in FIG. 6A, the hat-type sheet pile product 34 is provided with an arm 40 parallel to the web 34-1 between the flange 34-2 and the joint bottom 34-3. The joint 34-7 at each end of 40 is in a mirror-symmetrical relationship with each other, but is in a point-symmetrical relationship, and is generally similar to the U-shaped sheet pile product 24 and its intermediate member 23 described in the first embodiment. It has the same configuration.

  In order to roll and bend the hat-type sheet pile product 34 from the intermediate material 33, the double roll pair 5'-1, 5'-2 of the finishing mill 5 'has a finishing hole as shown in FIG. Placed the mold. Further, in order to intermediate-roll the intermediate material 33 from a material (not shown), the double roll pair 4'-1, 4'-2 of the intermediate rolling mill 4 'is provided with a hole just before finishing shown in Fig. 7 (b). Arranged. In the present embodiment, the intermediate material 33 having the cross-sectional shape shown in FIG. 6B, which is formed by the immediately preceding finishing die shown in FIG. The inclination angle α of the inner surface of the joint bottom 33-3 is 52 degrees, the inclination angle β of the inner surface of the claw 33-4 is 84 degrees, and the angle X formed by the joint bottom 33-3 and the claw 33-4 is 44 degrees.

  The intermediate material 33 was formed into a hat-type sheet pile product 34 having a cross-sectional shape shown in FIG. 6A by bending using a finishing hole mold shown in FIG. The intermediate rolling mills 3 'and 4' and the finishing rolling mill 5 'have a hole-shaped shape that is point-symmetric so that the right and left joints produce a point-symmetric hat-type sheet pile product 34. Now, since substantially the same processing is performed in which the top and bottom are reversed, processing of the joint corresponding portion 33-7 on one side (right side in FIG. 7) of the intermediate member 33 will be described below. First, in the finishing process, the outer edge end portion 33-5 of the joint bottom 33-3 of the joint corresponding portion 33-7 of the intermediate member 33 is pitched by the horizontal plane D of the upper roll 5'-1 of the finishing mill 5 '. Under the force perpendicular to O, the joint bottom 33-3 is bent together with the claw 33-4 connected to the outer edge end 33-5 of the joint bottom 33-3. At the same time, the claw 33-4 is slightly bent with respect to the joint bottom 33-3 by receiving an upward force perpendicular to the pitch line O by the substantially horizontal plane E of the lower roll 5'-2 of the finishing mill 5 '. . As a result, a hat-type sheet pile product 34 having the cross-sectional shape of FIG. In the present embodiment, the lateral width of the hat-type sheet pile product 34 is 935 mm and the height is 240 mm. Further, the inner surface of the joint bottom 34-3 of the hat-type sheet pile product 34 is not inclined with respect to the pitch line O (that is, the inner surface of the joint bottom 34-3 is parallel to the pitch line O). Is inclined by 36 degrees with respect to the joint bottom 34-3 (ie, the pitch line O). In addition, lithium grease is supplied to the horizontal surface D of the upper roll 5′-1 and the substantially horizontal surface E of the lower roll 5′-2 that press the outer edge end portion 33-5 of the joint bottom 33-3 of the intermediate member 33, and lubrication is performed. Finishing of the intermediate material 33 was performed in the applied state.

  According to the second embodiment described above, the present invention is applied not only when the sheet pile product is the U-type sheet pile product 24 that does not have the arm 40 but also when the sheet pile product is the hat-type sheet pile product 34 having the arm 40. Is possible. In the second embodiment, the same effect as in the first embodiment can be obtained.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to the example which concerns. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  In the above-described embodiment, the case of manufacturing the line-symmetric (mirror-symmetric) U-type sheet pile product 24 and the non-line-symmetric (non-mirror-symmetric) hat-type sheet pile product 34 has been described. ) U-type sheet pile products, line-symmetric (mirror-symmetric) hat-type sheet pile products, or other products having larzen or mold joints.

  In the above-described embodiment, when the U-type sheet pile product 24 or the hat-type sheet pile product 34 is manufactured from the raw material, the single rough rolling mill 2 is formed by rough rolling the raw material into a rough billet, Explained the case of using two intermediate rolling mills 3 and 4 for intermediate rolling of a rough steel slab into an intermediate material and one finishing rolling mill 5 for finishing and rolling the intermediate material into a sheet product. However, manufacturing may be performed in other arrangements or configurations.

  The present invention can be applied, for example, to a method for manufacturing a sheet pile product having a Larsen type joint used as a structural member, but is also useful for a sheet pile product having other similar joints.

It is a block diagram which shows schematic structure of the manufacturing apparatus 30 of the U-shaped sheet pile product 24 used in implementing the manufacturing method of the sheet pile product which concerns on the 1st Embodiment of this invention. It is a cross-sectional view showing the x cross section of a double roll pair 5-1 and the intermediate member 23, (a) is _{x 1} cross, (b) is _{x 2} cross, (c) 0 cross (x shows the _{1> x} 2> 0). FIG. 7 is an enlarged cross-sectional view showing an enlarged cross-section of a joint corresponding portion 23-7 of the intermediate member 23 in FIG. 2, (a) is FIG. 2 (a), (b) is FIG. c) shows an enlarged cross-sectional view of FIG. It is a figure which shows an example which rolls down the inner and outer surface of the joint bottom 23-3 and the nail | claw 23-4 with a hole type just before finishing. The angle X formed by the joint bottom 23-3 and the claw 23-4 of the intermediate member 23 is close to the angle Y formed by the joint bottom 24-3 and the claw 24-4 of the U-shaped sheet pile product 24. It is a figure which shows an example in the case of setting slightly larger than this. It is a figure which shows the intermediate material 33 of (a) hat-type sheet pile product 34 manufactured by the manufacturing method which concerns on the 2nd Embodiment of this invention, and (b) hat-type sheet pile product 34. (A) It is sectional drawing which shows the finishing hole type | mold of the finishing mill 5 'used for enforcing the manufacturing method which concerns on the 2nd Embodiment of this invention. (B) It is sectional drawing which shows the die just before finishing of the intermediate rolling mill 4 'used for enforcing the manufacturing method concerning the 2nd Embodiment of this invention. It is a figure which shows the procedure of the manufacturing process of what is called a U-shaped sheet pile product 14 as an example of the sheet pile product which has a Larzen type joint. It is a figure which shows the process of modeling after the rough rolling mill. It is a side view showing composition of double roll pairs 5-1 and 5-2 with which finishing mill 5 is provided. It is a cross-sectional view showing the x cross section of a double roll pair 5-1 and the intermediate member 13, (a) is _{x 1} cross, (b) is _{x 2} cross, (c) 0 cross (x shows the _{1> x} 2> 0). 11A and 11B are enlarged cross-sectional views each showing an enlarged cross section of the joint corresponding portion 13-7 of the intermediate member 13 in FIG. 11, (a) is FIG. 11 (a), (b) is FIG. c) shows an enlarged cross-sectional view of FIG. It is a cross-sectional view showing the x cross section of a double roll pair 5-1 and the intermediate member 13, (a) is _{x 1} cross, (b) is _{x 2} cross, (c) 0 cross (x shows the _{1> x} 2> 0).

Explanation of symbols

1 Heating furnace 2 Rough rolling mill (breakdown rolling mill)
3, 3 ', 4, 4' Intermediate rolling mill 4-1, 4-2, 5-1, 5-2 roll 4'-1, 4'-2, 5'-1, 5'-2 roll 5, 5 'Finish rolling mill 11 Material 11a-14a Cross-sectional shape 12 Coarse steel slab 13 Intermediate material 13-1, 23-1, 33-1, 34-1 Web 13-2, 23-2, 33-2, 34- 2 Flange 13-3, 14-3, 23-3, 24-3, 33-3, 34-3 Joint bottom 13-4, 14-4, 23-4, 24-4, 33-4, 34-4 Claw 13-5, 23-5, 33-5 Outer edge of joint bottom (joint bottom and claw connection)
13-7, 23-7, 33-7 Joint corresponding part 13-C One point of flange (after shifting)
13-D One point of flange (before shifting)
14 Sheet pile product 14-7, 24-7, 34-7 Joint 21 Material of U-type sheet pile product 21a to 24a Cross section 22 Coarse steel piece of U-type sheet pile product 23 Intermediate material of U-type sheet pile product 23-6 Flange Outer edge portion 23-8 Main body part 24 U-type sheet pile product 30 Manufacturing apparatus for sheet pile product 33 Intermediate material of hat-type sheet pile product 34 Hat-type sheet pile product 40 Arm A, C, D, D 'Roll horizontal plane B Roll substantially vertical Surface E, E 'Roll almost horizontal plane F Force received by intermediate material claw O Pitch line O ₁ , O ₂ Roll central axis X Angle formed by intermediate material joint bottom and claw Y Formed by sheet pile product joint bottom and claw Angle α Angle between joint bottom and pitch line β, β 'Angle between claw and pitch line δ Horizontal clearance

Claims (6)

In a method of manufacturing a sheet pile product having a Larzen type joint from a material by rolling and bending using a hole mold engraved in a roll pair provided in each of a series of rolling mills,
Using a rolling mill that performs rough rolling and intermediate rolling in the series of rolling mills, forming an intermediate material of the sheet pile product from the material,
By applying a force in a direction substantially perpendicular to a pitch line of a roll pair included in a rolling mill provided in the rolling mill to the joint-corresponding portion of the intermediate material using a rolling mill that performs finish rolling. A method for producing a sheet pile product having a Larsen type joint, wherein the sheet corresponding to the joint of the material is bent to form a sheet pile product having the Larsen type joint. The intermediate material has a configuration in which the joint corresponding part is provided at both ends of the main body part, and the joint corresponding part is connected to a joint bottom provided at both ends of the main body part and an outer edge end portion of the joint bottom. Consists of nails,
The method for manufacturing a sheet pile product having a Larsen type joint according to claim 1, wherein the joint bottom is bent with respect to the main body part when bending the joint corresponding part of the intermediate material. The bending of the joint bottom with respect to the main body part of the intermediate member is performed by rotating the joint bottom about a connecting portion between the main body part and the joint bottom, and bending the joint bottom. A manufacturing method for a sheet pile product having the described Larzen type joint. When the intermediate material of the sheet pile product is formed from the material, the joint bottom of the intermediate material corresponding to the joint is formed so as not to be parallel to the pitch line of the roll pair provided in the rolling mill that performs the intermediate rolling. The manufacturing method of the sheet pile product which has the Ralzen type joint of Claim 2 or 3 characterized by the above-mentioned. When forming the intermediate material of the sheet pile product from the material, the angle formed by the joint bottom and the claw is substantially the same as the angle formed by the joint bottom and the claw of the sheet pile product to be finally produced. The manufacturing method of the sheet pile product which has the Larzen type joint in any one of Claims 2-4 characterized by the above-mentioned. In a state where a lubricant is supplied to either or both of a roll surface that applies a force in a direction substantially perpendicular to a pitch line of a roll pair provided in a rolling mill that performs the finish rolling, and a roll surface that faces the roll surface, The method for manufacturing a sheet pile product having a Ralzen joint according to any one of claims 1 to 5, wherein the intermediate member is subjected to bending forming at a joint-corresponding portion.

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