JP2018126748A - Manufacturing method for sheet pile and joint-shaping rolling machine for sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a sheet pile of large height and high cross-section performance without causing scratches on a surface of a joint pair, and without separating the joint from a joint draft part of a caliber even when the amount of lubricant use is markedly reduced or even when little or no lubricant is applied regarding joint shaping in a manufacturing process for a sheet pile by caliber rolling.SOLUTION: A manufacturing method for a sheet pile is provided which has: an edging process of edging a joint of an intermediate cross-sectional material almost in a sheet pile form shaped by intermediate rolling; and a bend molding process for bend-molding the joint of the intermediate cross-sectional material. The joint edging process and the bend-molding process in one or both of the edging process and the bend-molding process are performed by a caliber pair carved in a double roll pair, which surround the whole joint and only its vicinity, are not in contact with a web and a flange of the intermediate cross-sectional material, but are arranged right and left in the intermediate cross-sectional material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing a steel sheet pile having joints at both ends in the width direction and a rolling mill for joint shaping.

  As steel sheet piles having joints at both ends in the width direction, for example, hat-shaped steel sheet piles and U-shaped steel sheet piles are known. Hereinafter, the hat-shaped steel sheet pile and the U-shaped steel sheet pile will be mainly described. The hat-shaped steel sheet pile 80 has, for example, a hat-shaped cross section having a pair of joints 86 and 87 as shown in FIG. 7. More specifically, the center-shaped web 81 and a pair of flanges on both sides of the web 81 are provided. 82, 83 and a pair of arms 84, 85 at the other ends of the flanges 82, 83, and a cross-section material comprising a hat-shaped cross-section main body and joint pairs 86, 87 formed on the left and right sides of the main body. It is. The hat-shaped steel sheet pile 80 is mainly used as a steel sheet pile wall 88 as shown in FIG. As shown in FIG. 8, the steel sheet pile wall 88 is constructed by driving a plurality of hat-shaped steel sheet piles 80 into the soil while fitting one end joint 86 and the other end joint 87 together. And has a soil retaining function.

  On the other hand, as shown in FIG. 9, a U-shaped steel sheet pile 90 having joint pairs 96, 97 is known on both sides of a U-shaped main body composed of a web 91 and flanges 92, 93 as shown in FIG. It is used as a steel sheet pile wall 98 as shown in FIG.

  The steel sheet pile wall 88 constructed with the hat-shaped steel sheet pile 80 has some excellent features compared to the steel sheet pile wall 98 constructed with the U-shaped steel sheet pile 90. One of them is structural reliability. In the case of the steel sheet pile wall 98 constructed of the U-shaped steel sheet pile 90, the joints 96 and 97 are located on the wall thickness center line OO of the steel sheet pile wall 98, whereas the hat-shaped steel sheet pile is provided. In the case of the steel sheet pile wall 88 constructed at 80, the joints 86 and 87 are located at the outermost edge of the steel sheet pile wall 88. Therefore, the steel sheet pile wall 98 constructed by the U-shaped steel sheet pile 90 receives the earth pressure P and is elastically deformed so that the fittings that are fitted slide together, and the sectional performance such as the secondary moment of section is 70%. However, the hat-shaped steel sheet pile does not deteriorate the cross-sectional performance. Therefore, when the steel sheet pile wall having the same cross-sectional performance is constructed with the hat-shaped steel sheet pile 80, the thickness T of the steel sheet pile wall is reduced to about 70% as compared with the case where the steel sheet pile wall 90 is constructed. Can do. However, with regard to the height H of one steel sheet pile, the hat steel sheet pile 80 is about 1.5 times as large as the U-shaped steel sheet pile 90, and the cross-sectional shapes of the joint pairs 86 and 87 are mirror-symmetrical with each other. In other words, they are asymmetric with each other, and the production of the hat-shaped steel sheet pile 80 requires advanced techniques.

  Using a series of hole molds in which a hat-shaped steel sheet pile 80 having a high height H and a cross-sectional shape of the joint pair 86, 87 is asymmetric with each other is engraved in a double roll (upper roll and lower roll) of a rolling mill. In order to produce a stable material by rolling and bending the material to be rolled, several techniques have been created and publicly known.

  In FIG. 11, the representative example of the process of manufacturing the hat-shaped steel sheet pile 80 with a hot rolling method is shown. In the production line L1, a heating furnace 3, a rough rolling mill 4, a first intermediate rolling mill 5, a second intermediate rolling mill 6, and a finishing rolling mill 9 are arranged in this order from the upstream side. A series of perforations 20 are engraved in 20-1 and 20-2, and the cross section of the material to be rolled changes as shown in FIG. In the following, the reference numeral 20 indicating the hole type is also referred to as the hole type 20 when discussing the general hole type, but when distinguishing each of the series of hole types, K1, K2, K3,. Is used. However, since there is no confusion even if the code indicating the double roll forming the hole type is not changed according to the name of the hole type, the codes 20-1 and 20-2 are always used for the double roll. . For convenience of explanation, the steel materials in the production line L1 may be collectively referred to as “rolled materials” regardless of the cross-sectional shape dimensions.

  In the production line L <b> 1, for example, a material to be rolled such as a slab 11 having a rectangular cross section is heated to a temperature at which hot rolling can be performed by the heating furnace 3 and then fed into the roughing mill 4. Three to five hole mold rows are engraved on the body of the double rolls 20-1 and 20-2 of the rough rolling mill 4 and the first intermediate rolling mill 5. The joint is formed while forming the cross-sectional shape from a rectangle to a hat-shaped rough shape, and the hat-shaped intermediate cross-section material 14 is formed. Next, the hat-shaped intermediate cross-section material 14 is fed into the subsequent second intermediate rolling mill 6.

  The double rolls 20-1 and 20-2 of the second intermediate rolling mill 6 are engraved with, for example, an elongated hole mold K3 and a bag hole mold K2 shown in FIGS. 12 (a) and (b), respectively. The rolled material is introduced into the elongated hole mold K3, and the plate thickness is repeatedly reduced to form the hat-shaped intermediate cross-section material 15. Then, the hat-shaped intermediate cross-section material 15 is introduced into the bag hole mold K2, and the joint is subjected to edging, and a hat-shaped intermediate cross-section material 16 in which the joint dimensions and the joint tip shape are made uniform in the length direction is formed. The hat-shaped intermediate cross-section material 16 is sent to the finishing mill 9.

  The finishing roll mold K1 of FIG. 12C is engraved on the double rolls 20-1 and 20-2 of the finishing mill 9, and the hat-shaped intermediate cross-section material 16 is mainly bent with respect to the joint. The product 80 of a hat-shaped steel sheet pile is obtained.

  In the manufacturing process of the hat-shaped steel sheet pile 80 as described above, for example, Patent Document 1 includes a part of the series of hole molds in the manufacturing process except for a finishing hole mold that finally molds an asymmetric hat-shaped cross-section material. Or, all of the hole molds, at least one arm pressure lower part is inclined in a direction different from the arm hole lower part of the finishing hole mold, the material to be rolled is rolled by the hole mold to form an intermediate cross-section material, A method is disclosed in which the asymmetric hat-shaped cross-section material is formed by bending a pair of joints of the intermediate cross-section material with the finishing hole mold.

13 (a) shows the shape of the bag hole mold K2, and FIG. 13 (b) shows the material 70 to be rolled formed with the bag hole mold K2 (this material to be rolled is the hat-shaped intermediate cross-section material 16). ) Shows a situation in which the joint pair 76, 77 of the material 70 to be rolled is bent with the finish hole mold K1. The arm pressure reduction portions 24 and 25 of the finishing hole mold K1 shown in FIG. 13B are the pitch lines PL of the finishing hole mold K1 (that is, the central axis and the other of the two rolls 20-1 and 20-2). Is parallel to the central axis located in the middle of the center axis of the roll of the roll, and the arm pressure reduction portions 24 and 25 of the bag hole type K2 shown in FIG. The left arm reduction site 24 is inclined by θ _A1 and the right arm reduction site 25 is inclined by θ _{A2 with} respect to the pitch line PL of K2. As described in detail in Patent Document 1, this is a technique for suppressing the bending of the material 70 to be rolled when the material 70 having an asymmetric cross section is rolled with the bag hole mold K2, and θ _A1 And θ _A2 are determined so that one of the two inertia main axes of the outlet cross section of the bag hole mold K2 (ie, the cross section immediately below the roll axis) forms an angle within 3 degrees with the pitch line PL. It is determined to form an angle of 3 degrees or less with a direction perpendicular to the pitch line PL (that is, a vertical direction).

  Further, in Patent Document 2, when the joint is a Larzen type joint as in the steel sheet pile shown in FIG. 7 or FIG. 9, the material 70 to be rolled (this material to be rolled is the hat-shaped intermediate) by the finishing hole mold K1. A method of bending the joint pair 76, 77 (which is the cross-sectional material 16) is disclosed. That is, the material 70 (hat-shaped intermediate cross-section material 16) has a configuration in which joint pairs 76 and 77 are provided at both ends of the main body, and the joint pairs 76 and 77 are respectively provided at both ends of the main body. The joint bottoms 76-1, 77-1 provided, and claws 76-2, 77-2 connected to the outer edge ends of the joint bottoms 76-1, 77-1, and the material 70 (hat) When bending the joint pair 76, 77 of the shape intermediate cross-section material 16), the joint bottoms 76-1, 77-1 are bent with respect to the main body portion, and the material to be rolled 70 (hat shape) is formed from the material. When forming the intermediate cross-section material 16), the joint bottoms 76-1, 77-1 of the joint pair 76, 77 of the material to be rolled 70 (hat-shaped intermediate cross-section material 16) include a rolling mill that performs the intermediate rolling. Do not be parallel to the pitch line PL of the double rolls 20-1 and 20-2. The double roll 20 provided in the rolling mill that mainly performs the finish rolling on the joint pairs 76 and 77 of the material to be rolled 70 (hat-shaped intermediate cross-section material 16) using a rolling mill that performs shaping and finish rolling. -1 and 20-2 by applying a force in a direction perpendicular to the pitch line PL to bend the joint pairs 76 and 77 of the material 70 to be rolled (hat-shaped intermediate cross-section material 16), and the Ralsen joint It is disclosed to form a sheet pile product having

  Further, in Patent Document 3, when the joint is a Larzen type joint as in the steel sheet pile shown in FIG. 7 or FIG. 9, the material 70 to be rolled (the hat-shaped intermediate cross-section material 16) is formed by the finishing hole mold K1. A specific method is disclosed in Patent Document 2 for bending the joint pair 76 and 77. That is, as shown in FIG. 13 (b), the double rolls 20-1 and 20-2 that perform intermediate rolling and finish rolling are defined as horizontal rolls, and then the rolling is performed using a rolling mill that performs finish rolling. For the joint pair 76, 77 of the material 70 (hat-shaped intermediate section material 16), the material to be rolled 70 (hat-shaped) by the joint bottom contact portions 28, 29 of the horizontal roll provided in the rolling mill that mainly performs the finish rolling. By bending the outer edges of the joint bottoms 76-1, 77-1 of the intermediate cross-section material 16), the joint pair 76, 77 of the rolled material 70 (hat-shaped intermediate cross-section material 16) is bent. In addition, it is disclosed that a sheet pile product having the Larzen type joint is formed.

  Further, Patent Document 4 discloses a bending method for a joint pair 76, 77 using four rollers 40, 41, 42, 43 as shown in FIG. That is, the arm portion 74 of the material to be rolled 70 is sandwiched from above and below by the pair of upper and lower horizontal rollers 42 and 43 to restrain the material to be rolled 70 in the vertical direction, and further on the inner surface of the flange 72 of the material to be rolled 70. The saddle roller 41 is contacted to restrain the material 70 from moving in the left direction, and the joint 76 is bent by the hole mold K1 engraved in the saddle roller 40 and the upper and lower horizontal roller pairs 42 and 43. The product joint 86 is shaped. The same applies to the bending of the material 70 to the other joint 77.

Japanese Patent No. 4464865 Japanese Patent No. 4638828 Patent No. 5327167 Japanese Patent No. 4830255

For example, as can be seen from the hole diagram of the bag hole mold K2 in FIG. 13 (a), generally, as the height H of the steel sheet pile is larger, the joint pair 76, 77 of the material 70 to be rolled is subjected to rolling or bending. The joint reduction parts 26 and 27 of the rolls 20-1 and 20-2 are far from the pitch line PL of the double rolls 20-1 and 20-2. Therefore, the difference in diameter between the two roll surfaces having different diameters that form the gap between the joint reduction sites 26 and 27 increases, and the difference between the pitch diameter D _P (the distance between the upper roll central axis and the lower roll central axis). Also grows. Similarly, the arm roll reduction portions 24 and 25 that abut the arm and the web reduction portion 21 that abuts the web of the double rolls 20-1 and 20-2 are also pitch lines of the double rolls 20-1 and 20-2. becomes far from the PL, with the diameter difference between the two rolls face of different diameter to one another forming these gaps is increased, the greater the difference between the pitch diameter D _P.

  Therefore, in order to roll a steel sheet pile with a large height H using the techniques described in Patent Documents 1 to 3, there are mainly the following two problems. First, there is a problem that rubbing from the roll surface easily occurs on the surfaces of the joint pairs 76 and 77 of the material 70 to be rolled. This is caused by a large speed difference between the joint reduction portions 26 and 27 of the double rolls 20-1 and 20-2 that roll or bend the joint pairs 76 and 77 and the joint pairs 76 and 77.

鋼矢板の高さＨが大きいほどｐ値とｑ値は大きいので、式（４）から相対速度Ｖ_Ｓの絶対値も大きいことが分かる。すなわち、鋼矢板の高さＨが大きいほど、被圧延材７０の継手対７６、７７を圧延または曲げ成形する二重ロール２０−１、２０−２の継手圧下部位２６、２７と、前記継手対７６、７７の間に大きな速度差が生じ、該継手対７６、７７の表面に擦り疵が発生しやすくなるのである。 This will be described with reference to FIG. The discharge speed V _M (mm / s) at the exit cross section of the perforated material 20 of the material 70 to be rolled is _{P P} (mm), the roll rotation speed is N (rpm), and the circumferential ratio is π. It is given by equation (1).
V _M = πND _P / 60 (1)
On the other hand, for the joint roll-down parts 26 and 27 of the double rolls 20-1 and 20-2 for rolling or bending the joint pair 76 and 77, the peripheral speed of the roll surface of the joint roll-down part 26 or 27 is changed to a large diameter roll. When V _RH (mm / s) is set at the site and V _RL (mm / s) is set at the small-diameter roll site, V _RH and V _RL are given by Formula (2) and Formula (3), respectively.
V _RH = πN (D _P + 2p) / 60 (2)
V _RL = πN (D _P −2q) / 60 (3)
Here, p is the distance from the pitch line PL of the joint reduction site 26 or 27 in the outlet cross section of the hole mold 20 to the large diameter roll area (lower roll in the case of FIG. 13A), and q is the hole mold. This is the distance from the pitch line PL of the joint reduction section 26 or 27 in the outlet cross section of 20 to the small diameter roll section (in the case of FIG. 13A, the upper roll), and there is a relationship of q>p> 0.
The relative speed V _{S of the} material to be rolled with respect to the joint reduction part 26 or 27 of the double rolls 20-1 and 20-2 for rolling or bending the joint pair 76 and 77 is given by the equation (4). .

Since the p value and the q value increase as the height H of the steel sheet pile increases, it can be seen from Equation (4) that the absolute value of the relative speed V _S is also large. That is, as the height H of the steel sheet pile is larger, the joint reduction portions 26 and 27 of the double rolls 20-1 and 20-2 that roll or bend the joint pairs 76 and 77 of the material 70 to be rolled, and the joint pair A large speed difference is generated between 76 and 77, and the surface of the joint pair 76 and 77 is liable to be rubbed.

  Speaking of the case of a hat-shaped steel sheet pile, this situation is the same for the arm-rolling sites 24 and 25 and the web-rolling site 21 of the double rolls 20-1 and 20-2, which are also far from the pitch line PL, Scratches are also likely to occur on the surfaces of the arm pairs 74 and 75 and the web 71. Conventionally, liquid lubricants such as water, mineral oil and esters, and solid lubricants such as graphite are sprayed or applied to the surface of a roll or a material to be rolled to suppress this problem.

  Secondly, the joint pairs 76 and 77 are likely to be detached from the joint reduction portions 26 and 27 of the hole mold 20, and if they are separated, the joint pairs 76 and 77 are not normally drawn down and there is a risk of causing a shape defect. This is because, in the hole rolling using the double rolls 20-1 and 20-2, as the roll gap for rolling down the material 70 is farther from the pitch line PL, Regarding the small diameter roll portion, the former comes into contact with the material 70 to be rolled earlier than the latter, and the material 70 is pushed away to the latter side.

The reason for this will be described with reference to FIGS. Figure 14 is a gap having different diameters double roll 20-1 and 20-2 of the large-diameter roller of small diameter rolls and the diameter _{D 2} of diameter _{D 1 (D 1 <D 2} ), and rolling the material to be rolled 70 It shows how to reduce the thickness from h _i to h _o, (a) is a front view, (b) is a side view. In (a), the circumferential surface of different-diameter double rolls 20-1 and 20-2 and the cross section of the material to be rolled 70 are drawn with a one-dot chain line, a broken line, and a solid line. -B shows a cross-section and _O 1 -O ₂ section. However, in FIG. 14A, the three cross sections of the material to be rolled 70 are drawn while being shifted in the horizontal direction for easy viewing. Further, FIG. 15 (a) shows a front view of the rolling to reduce the claw height by edging the joint of the rolled material 70 from h _i to h _o, FIG. 15 (b) bending the joint of the rolled material 70 molded to a front view of the rolling to reduce the coupling height from h _i to h _o.

As shown in FIG. 14 (b), the at entry side of the rolling, the plate thickness h the rolled material 70 _i initially the thickness center roll gap center X-X in accordance with extended side (the left direction in the drawing) , The plate contacts the large-diameter roll 20-2 at the position l _d2 from the outlet O of the contact arc (ie, directly below the roll axis). At this time, the plate is still in contact with the small-diameter roll 20-1. Absent. Therefore, the plate is pushed toward the small-diameter roll 20-1 by the large-diameter roll 20-2 in a state where the plate thickness is not reduced while proceeding in the exit direction. Wherein the rolled material 70 is pushed by s on the side of the small-diameter rolls 20-1 from proceeds when the first position from the contact arc outlet to the position of the l _d, thickness center is X'-X of the material to be rolled 70 ' moving up, starts thickness reduction also in contact with the small-diameter rolls 20-1, plate thickness at the outlet O of the contact arc is discharged to the outlet side is圧減to h _o.

これらの式から、ｌ_ｄ２≧ｌ_ｄ、ｓ≧０であり、直径差Ｄ_２−Ｄ_１が大きいほど、また板厚圧下量Δｈ＝ｈ_ｉ−ｈ_ｏが大きいほど、差ｌ_ｄ２−ｌ_ｄおよびｓは大きいことが分かる。Ｄ_１＝Ｄ_２またはΔｈ＝０の場合に限り、ｌ_ｄ２＝ｌ_ｄ、ｓ＝０である。 From the geometric relationship, l _d2 , l _d and s are approximately given by the equations (5), (6) and (7), respectively.

From these _{equations, l d2} ≧ _{l d,} a s ≧ 0, the larger the diameter difference _D 2 -D _1, also the larger plate thickness reduction amount Δh ₌ h i -h _o, the difference _l d2 -l _d It can be seen that and s are large. Only when D ₁ = D ₂ or Δh = 0, l _d2 = l _d and s = 0.

As shown in FIGS. 15 (a) and 15 (b), the case of joint edging or bending with different diameter double rolls 20-1 and 20-2 is exactly the same as in the case of plate thickness reduction in FIG. , edging and bending the inlet side height of the joint undergoing molding _{h i,} egress height _{h o,} if put height reduction amount and Δh ₌ h i -h _o, equation (5), (6), (7) can be applied as it is.

By the way, the hat-shaped steel sheet pile 80 is taken as an example with reference to FIGS. 11 and 12 above, and the manufacturing method thereof has been described in detail. However, in the manufacturing process shown in FIG. 11, the bag including the elongated hole type K3 for the material 70 to be rolled. in the upstream rolling than the caliber K2, the plate thickness reduction amount Δh is large rolling load = h _i -h _o is suppressed to about several millimeters.

On the other hand, in the edging rolling using the bag hole mold K2 (edging for the joint) and the finishing rolling using the finishing hole mold K1 (bending forming for the joint), the thickness reduction is almost 0 or very small. Although load is small, the height reduction amount Δh = h _i -h _o for the joint is very large, that is ten to ten and several millimeters is usually. Therefore, according to Expression (7), the amount s pushed to the small-diameter roll side by the large-diameter roll is large on the entrance side of the hole rolling. When the s value is large, the joints 76 and 77 of the material 70 to be rolled are easily detached from the hole-shaped joint reduction sites 26 and 27. Taking a hat-shaped steel sheet pile 80 as an example, this will be described with reference to FIG.

In FIG. 16, the joint tip portions 76-3 and 77-3 of the material to be rolled 70 are surrounded by the closed holes 30 and 31 of the hole mold 20 (bag hole mold K <b> 2), and the joint reduction parts 26 and 27 of the bag hole mold K <b> 2. in shows a state in which edging the joint 76 and 77, the height of the joint 76 and 77 by edging reduced from _{h i} to _{h o} as shown in FIG. 15 (a). In the case of FIG. 16, the joint roll-down parts 26 and 27 are located above the pitch line PL, and therefore the upper roll 20-1 has a small diameter and the lower roll has two roll surfaces forming the joint roll-down parts 26 and 27. 20-2 has a large diameter. Similarly, the upper roll 20-1 has a small diameter and the lower roll 20-2 has a large diameter with respect to the two roll surfaces forming the arm pressure reduction parts 24 and 25, but the web reduction part 21 is below the pitch line PL. Therefore, the upper roll 20-1 has a large diameter and the lower roll 20-2 has a small diameter with respect to the two roll surfaces forming the web reduction part 21. Therefore, on the entrance side of the hole mold 20, the joints 76 and 77 and the arms 74 and 75 of the material 70 to be rolled are pushed upward by the large-diameter lower roll 20-2, and the web 71 is the large-diameter upper roll 20-1. The joints 76 and 77 are torn up and down from the web 71 together with the arms 74 and 75.

In FIG. 16, the large-diameter lower roll 20-2 pushes the left joint tip 76-3 upward at point A and the right arm 75 and joint 77 upward at face B. At the same time, the large-diameter upper roll 20-1 pushes the vicinity of the left end of the web 71 downward at the point C.
As the sum of the amount by which the joints 76 and 77 and the arms 74 and 75 are pushed upward by the lower roll and the amount by which the web 71 is pushed downward by the upper roll is larger, the joints 76 and 77 and the arms 74 and 75 and the web 71 are Tries to tear apart in the vertical direction. However, since the joints 76, 77 and arms 74 and 75 and the web 71 are connected via the flanges 72 and 73, the joints 76, 77 and arms 74 and 75 and the web 71 are not actually torn. Further, the joints 76, 77 and arms 74, 75 on both sides are drawn toward the web 71 (that is, toward the center of the hole mold 20) as shown by the arrows via the flanges 72, 73 (that is, the material 70 to be rolled). And the joints 76 and 77 are about to be detached from the joint lowering portions 26 and 27 of the hole mold 20. Height reduction amount Δh ₌ h i -h because _o is greater s value is large in the edging, since both sides of the joint 76, 77, arms 74 and 75 via a flange 72 and 73 are attracted large towards the web 71, The joints 76 and 77 are easily detached from the hole-type joint reduction sites 26 and 27.

Also in the case where the joints 76 and 77 are bent at the joint reduction sites 26 and 27 of the hole mold 20 (finishing hole mold K1) as shown in FIG. 17, the height reduction amount Δh of the joint as shown in FIG. Since s _i = h _o is large, the s value is large, and the joints 76 and 77 of the material to be rolled 70 are easily detached from the joint reduction parts 26 and 27 of the finishing hole type K1 as in the case of edging.

Therefore, conventionally, to suppress the s value has been devised on the grooved design to reduce the height reduction amount Δh = h _i -h _o. However, there is a limit to this. Conventionally, in order to keep the s value below the limit value for preventing the joints 76 and 77 from being detached from the joint reduction parts 26 and 27 of the hole mold 20, It was necessary to reduce the diameter difference D ₂ -D ₁ to a certain value or less. That is, there is an upper limit for the height H of the steel sheet pile that can be manufactured by the hole rolling method, and there is an upper limit for the cross-sectional performance.

  With respect to the technique described in the above-mentioned Patent Document 4, the bending of the joint pairs 76 and 77 can be stably performed, but a joint bending molding hole mold K1 including four rollers is arranged on the left and right, and a total of eight rollers are required. Since the roller is not driven, it is necessary to rely on another means, for example, a rolling mill in the vicinity of the roller, as a driving force for bending the joint.

  In view of the above circumstances, the object of the present invention is to greatly increase the amount of lubricant used for edging or bending forming (hereinafter collectively referred to as joint shaping) for joints in the manufacturing process of steel sheet piles by die rolling. Even if it is reduced to a small amount or without applying a lubricant, the surface of the joint pair is not rubbed, and the joint does not come off from the hole-type joint reduction site, and the device configuration is simple. It is to provide a manufacturing technology for a steel sheet pile having a large height and a high cross-sectional performance.

  In order to achieve the above object, according to the present invention, there is provided a method for manufacturing a steel sheet pile having joints at both ends in the width direction, and the intermediate cross-section material is a substantially steel sheet pile-shaped intermediate cross-section material formed by intermediate rolling. An edging process for edging the joint of the intermediate section, and a bending process for bending the joint of the intermediate cross-section material, and the joint in one or both of the edging process and the bending process. The edging process and the bending process enclose the entire joint and the vicinity thereof, do not contact the web and flange of the intermediate cross-section material, and are engraved on a pair of double rolls arranged on the left and right sides of the intermediate cross-section material. A method for manufacturing a steel sheet pile is provided, which is performed using a pair of hole types.

  A hole engraved in a pair of double rolls arranged on the left and right sides of the intermediate cross-section material, surrounding the entire joint of the intermediate cross-section material and the vicinity thereof, not contacting the web and flange of the intermediate cross-section material The mold pair may be engraved in the double roll pair so that each pitch line of the hole mold pair passes through each of the joints during joint shaping.

  Each of the double roll pairs disposed on the left and right of the intermediate cross-section member has a configuration in which one or both of the upper roll shaft and the lower roll shaft of each of the double roll pairs are inclined at a predetermined angle with respect to the horizontal direction. May be.

  Further, according to the present invention from another point of view, it is a rolling mill for joint shaping of steel sheet piles having joints at both ends in the width direction, and is a joint of a substantially steel sheet pile-shaped intermediate cross-section material formed in the intermediate rolling mill. It has a double roll pair disposed on the left and right of the intermediate cross-section material that performs one or both of edging and bending, and the double roll pair surrounds only the entire joint and the vicinity thereof, There is provided a rolling mill for joint shaping of steel sheet piles, wherein a pair of hole types that are not in contact with the web and flange of the intermediate cross-section material are formed.

  The double roll pair is engraved with a hole pair that encloses only the entire joint of the intermediate cross-section member and the vicinity thereof, and does not contact the web and flange of the intermediate cross-section member. The pitch line may pass through each of the joints during joint shaping.

  Each of the double roll pairs disposed on the left and right of the intermediate cross-section member has a configuration in which one or both of the upper roll shaft and the lower roll shaft of each of the double roll pairs are inclined at a predetermined angle with respect to the horizontal direction. May be.

  According to the present invention, for joint shaping in the manufacturing process of steel sheet piles by perforated rolling, even if the amount of lubricant used is greatly reduced or almost no lubricant is applied, the surface of the joint pair is rubbed. It is possible to manufacture a steel sheet pile having a large height and a high cross-sectional performance without causing the joint to be disengaged from the hole-type joint reduction site.

It is explanatory drawing about the cross-sectional shape of the to-be-rolled material on the manufacturing line of the hat-shaped steel sheet pile concerning embodiment of this invention technique, and this manufacturing line. (A) is explanatory drawing which shows the example in the case of applying this invention technique to joint edging, (b) is an explanatory view which shows the example in the case of applying this invention technique to the bending of a joint. It is explanatory drawing which shows the hole type at the time of applying this invention technique to the edging of a joint, and the state of edging. It is explanatory drawing which shows the hole type | mold in the case of applying this invention technique to the bending process of a joint, and the state of a bending process. It is explanatory drawing which shows the hole type carved in the roll of a skew roll mill, and the state of edging, when applying this invention technique to edging of a coupling. It is explanatory drawing which shows the hole shape carved in the roll of a skew roll rolling machine, and the state of bending forming, when applying this invention technique to bending forming of a coupling. It is explanatory drawing which shows the rolling mill based on this invention technique, (a) shows a cantilever type 4 roll rolling mill, (b) shows the cantilever type 4 roll rolling mill of a skew roll especially. It is explanatory drawing of the cross section of a hat-shaped steel sheet pile. It is explanatory drawing which shows the steel sheet pile wall constructed | assembled with the hat-shaped steel sheet pile. It is explanatory drawing of the cross section of a U-shaped steel sheet pile. It is explanatory drawing which shows the steel sheet pile wall constructed | assembled with the U-shaped steel sheet pile. It is explanatory drawing about the cross-sectional shape of the general manufacturing line of a hat-shaped steel sheet pile, and the to-be-rolled material on this manufacturing line. It is explanatory drawing which shows the shape of a series of hole type | molds used for the last stage of rolling of a hat-shaped steel sheet pile. (A) is explanatory drawing of the shape of the hole type | mold 20 (bag hole type K2), (b) is a mode that the joint pair 76, 77 of the to-be-rolled material 70 is bend-molded by the hole type 20 (finishing hole type K1). It is explanatory drawing which shows. In the gap of the small diameter roll (diameter _{D 1)} and large-diameter roller (diameter _{D 2)} having different diameters double roll 20-1 and 20-2 made of a plate thickness with the plate is rolled within _{h o} from _{h i} It is explanatory drawing which shows a mode that it reduces, (a) is a front view, (b) is a side view. It is a hole type composed of different-diameter double rolls 20-1 and 20-2 composed of a small-diameter roll (diameter D ₁ ) and a large-diameter roll (diameter D ₂ ). how the height decreases from h _i to h _o, (b) is an explanatory view showing a state where height is joint bending decreases from h _i to h _o. It is a figure explaining joint becoming easy to detach | leave from a hole-type joint reduction site | part, when s value is large by the joint edging of a hat-shaped steel sheet pile. It is a figure explaining that a joint will be easy to detach | leave from a hole type joint reduction site | part, when s value is large by joint bending shaping | molding of a hat-shaped steel sheet pile. It is explanatory drawing which shows the joint bending method by the hole type | mold comprised by four rollers which is a well-known technique.

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

  FIG. 1 shows a production line for a hat-shaped steel sheet pile including a rolling mill (hereinafter also referred to as a cantilevered four-roll rolling mill) 8 having a left-right pair of cantilevered double rolls according to an embodiment of the present invention. It is explanatory drawing about L2. Fig.1 (a) is an example in the case of applying the present invention technique to joint edging, and on the production line L2, in order from the upstream side, a heating furnace 3, a rough rolling mill 4, a first intermediate rolling mill 5, A second intermediate rolling mill 6, a cantilever 4-roll rolling mill 8, and a finish rolling mill 9 are arranged. FIG.1 (b) is an example in the case of applying this invention technique to the bending of a joint, and on the production line L2, in order from the upstream side, a heating furnace 3, a rough rolling mill 4, a first intermediate rolling mill 5, A second intermediate rolling mill 6, a cantilever 4-roll rolling mill 8, and a finish rolling mill 9 are arranged. In FIGS. 1 (a) and 1 (b), a double roll in which a hole shape is engraved is incorporated into the rolling mill in a rolling mill other than the cantilevered four roll rolling mill 8.

  Hereinafter, rolling of the material to be rolled in each rolling mill shown in FIG. 1 will be described with reference to the drawings. However, about the form of rolling of the material to be rolled in the rough rolling mill 4, the first intermediate rolling mill 5, and the second intermediate rolling mill 6 after being heated to a temperature at which hot rolling is possible in the heating furnace 3, FIG. 11 is substantially the same as the conventional manufacturing technique of the hat-shaped steel sheet pile shown in FIG. 11, and has already been described in detail above, and the description thereof is omitted here.

  Cantilevered against the hat-shaped intermediate cross-section material 15 formed by the stretched hole mold K3 engraved in the double rolls 20-1 and 20-2 of the second intermediate rolling mill 6 as shown in FIG. The pair of joints 76 and 77 are edged by using four rolls 20-1, 20-2, 20-3, and 20-4 as shown in FIG. As shown in FIG. 2, the edging comprises a double hole 20-1, 20-2 and double rolls 20-3, 20-4 as hole type rolls to form a bag hole type K2, and a pair of right and left joints 76, 77 is subjected to edging. Here, the diagrams on the left and right sides of FIG. 2 are enlarged views of the left and right joint portions of the center diagram. Regarding the bag hole mold K2, the cross section immediately below the roll axis of the bag hole mold K2 is indicated by a solid line, and the cross section of the hole mold K2 at the position where the roll surface comes into contact with the joint pair 76 and 77 and edging starts is indicated by a broken line. . That is, the edging for the joint pairs 76 and 77 starts with the broken line cross section of the bag hole type K2 and ends with the solid line cross section of the bag hole type K2.

As shown in FIG. 13 (a), the pitch line PL of the conventional bag hole type K2 passes through the flange pressure reduction parts 22, 23 without passing through the joint pressure reduction parts 26, 27 of the bag hole type K2. As shown in FIG. 2, the pitch line PL of the bag hole type K2 is designed to pass through the joint reduction sites 26 and 27. Therefore, the values of p and q in Equation (4) are reduced, and the V _S value is reduced. As a result, rubbing on the surfaces of the joint pairs 76 and 77 due to friction on the roll surface is eliminated. Moreover, the double rolls 20-1 and 20-2 and the double rolls 20-3 and 20-4 are divided into right and left. Therefore, in the technique of the present invention, as shown in FIG. 16 in the conventional method, the large-diameter lower roll 20-2 has a point A at the left joint tip 76-3 upward, and a surface B has a right arm 75 and a joint 77. At the same time, the large diameter upper roll 20-1 pushes the vicinity of the left end of the web 71 downward at the point C, and the joints 76 and 77 are disengaged from the joint lowering portions 26 and 27 of the hole mold 20 (K2). There is no fear of doing it.

  As another form, in FIG.1 (b) which applied this invention technique to the bending process with respect to a joint, the bag hole type | mold K2 is engraved in the double rolls 20-1 and 20-2 of the 2nd intermediate rolling mill 6. FIG. Then, a hole mold K1 'for bending the joint as shown in FIG. 3 is formed in the cantilever type four-roll rolling mill 8, and the joint pair 76, 77 is bent (bending molding process). Also in FIG. 3, the pitch line PL of K <b> 1 ′ is designed to pass through the joint reduction sites 26 and 27. The bending of the joint pair 76 and 77 starts with the broken line cross section of the bag hole mold K1 'and ends with the solid line cross section of the hole mold K1', and the material 70 to be rolled is sent to the subsequent finishing mill 9. The finishing mill 9 is engraved with a hole mold K1, and the entire cross section of the material 70 to be rolled is trimmed and finished into a product 80.

  2 and 3, the left and right double rolls 20-1 and 20-2 and the double rolls 20-3 and 20-4 of the cantilever type four-roll rolling mill 8 are all rolls. Although the shaft is horizontal, the upper rolls 20-1 and 20-3 are inclined downward by a predetermined angle with respect to the horizontal as shown in FIGS. 4 and 5, and the lower rolls 20-2 and 20-4 are horizontal. A so-called skew roll, which is inclined upward by a predetermined angle, has the same effect, and this is also within the scope of the technology of the present invention.

  2, 3, 4, and 5, since plate thickness reduction is not applied to portions other than the joint pairs 76 and 77 of the material 70 to be rolled, other than the joint pairs 76 and 77 There is no elongation in the length direction in the portion. On the other hand, in the case of joint shaping for the joint pairs 76 and 77, that is, edging and bending, there is almost no plate thickness reduction with respect to the joint pairs 76 and 77. Almost no occurrence occurs, so that the workpiece 70 is not warped.

  FIG. 6 shows the above-mentioned cantilever type 4 roll rolling mill 8, wherein (a) shows the roll axes of the left and right double rolls 20-1 and 20-2 and the double rolls 20-3 and 20-3. (B) shows a rolling mill in which the roll axis is skewed.

  With the technology of the present invention, the joint shaping in the manufacturing process of the hat-shaped steel sheet pile by hole rolling can be carried out on the surface of the joint pair even if the amount of lubricant used is greatly reduced or almost no lubricant is applied. It is possible to produce a hat-shaped steel sheet pile having a large height and a high cross-sectional performance without causing the joint to be disengaged from the hole-type joint reduction site.

  As mentioned above, although an example of embodiment of this invention was demonstrated, this invention is not limited to the form of illustration. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, in the above embodiment, a hat-shaped steel sheet pile is illustrated and described as a steel sheet pile having joints at both ends in the width direction, but the scope of application of the present invention is not limited to this. That is, the technology of the present invention can also be applied to manufacturing technologies for U-shaped steel sheet piles and Z-shaped steel sheet piles having joints at both ends in the width direction. However, for U-shaped steel sheet piles and Z-shaped steel sheet piles, the steel sheet pile height H is generally small, and is about 1 / 1.5 to 1/3 the height of the hat-shaped steel sheet pile. When the steel sheet pile height H is small, the joint is detached even if the joint is shaped using a hole mold that is built into a rolling mill with both ends as in the conventional method or a hole mold that is engraved in a double roll. There is little fear of doing. Rather, when the steel sheet pile height H is small, the conventional method can wrap the entire cross section including not only the joint but also the web and flange in one hole mold, so that the joint thickness can be reduced. There is an advantage that shaping can be performed simultaneously.

  The present invention can be applied to a manufacturing method of a steel sheet pile having joints at both ends in the width direction and a rolling mill for joint shaping.

DESCRIPTION OF SYMBOLS 3 ... Heating furnace 4 ... Rough rolling mill 5 ... 1st intermediate rolling mill 6 ... 2nd intermediate rolling mill 8 ... Cantilever type 4 roll rolling mill 9 ... Finishing rolling mill 11 ... Slab 14, 15, 16, 17 ... Hat type Intermediate cross-section material 20 ... Hole type 20-1, 20-2 ... Double roll of rolling mill 20-3, 20-4 ... Double roll of rolling mill 21 ... Perforated web reduction site 22, 23 ... Hole type Flange reduction part 24, 25 ... Hole type arm reduction part 26, 27 ... Hole type joint reduction part 28, 29 ... Hole type joint bottom contact part 30, 31 ... Hole type joint tip closing part 40, DESCRIPTION OF SYMBOLS 41 ... Saddle roller for joint bending 42, 43 ... Horizontal roller for joint bending 70 ... Rolled material of hat-shaped steel sheet pile 71 ... Web of rolled material of hat-shaped steel sheet pile 72, 73 ... Cover of hat-shaped steel sheet pile Rolled material flange pair 74, 75 ... Hat pair of rolled steel sheet pile material 76, 77 ... Joint pair of rolled material of hat-shaped steel sheet pile 76-1, 77-1 ... Joint bottom of rolled material of hat-shaped steel sheet pile 76-2, 77-2 ... Rolled material of hat-shaped steel sheet pile Joint claws 76-3, 77-3 ... Joint tip of rolled material of hat-shaped steel sheet pile 80 ... Hat-shaped steel sheet pile 81 ... Web of hat-shaped steel sheet pile 82, 83 ... Flange pair of hat-shaped steel sheet pile 84, 85 ... Arm pair of hat-shaped steel sheet pile 86, 87 ... Joint pair of hat-shaped steel sheet pile 88 ... Steel sheet pile wall constructed with hat-shaped steel sheet pile 90 ... U-shaped steel sheet pile 91 ... Web of U-shaped steel sheet pile 92, 93 ... Flange pair of U-shaped steel sheet pile 96, 97 ... Joint pair of U-shaped steel sheet pile 98: Steel sheet pile wall constructed with U-shaped steel sheet pile

Claims (6)

A method for producing a steel sheet pile having joints at both ends in the width direction,
About the substantially steel sheet pile-shaped intermediate cross-section material formed by intermediate rolling, an edging process for edging the joint of the intermediate cross-section material, and a bending process for bending the joint of the intermediate cross-section material, Have
The edging process and the bending process of the joint in one or both of the edging process and the bending process surround the entire joint and only the vicinity thereof, and do not contact the web and flange of the intermediate cross-section material, The method for producing a steel sheet pile, wherein the method is performed by a pair of holes engraved in a pair of double rolls arranged on the left and right of the intermediate cross-section material. A hole engraved in a pair of double rolls arranged on the left and right sides of the intermediate cross-section material, surrounding the entire joint of the intermediate cross-section material and the vicinity thereof, not contacting the web and flange of the intermediate cross-section material 2. The steel according to claim 1, wherein the mold pair is engraved in the double roll pair so that each pitch line of the hole mold pair passes through each of the joints during joint shaping. 3. Manufacturing method of sheet pile. Each of the double roll pairs disposed on the left and right of the intermediate cross-section member has a configuration in which one or both of the upper roll shaft and the lower roll shaft of each of the double roll pairs are inclined at a predetermined angle with respect to the horizontal direction. The manufacturing method of the steel sheet pile of Claim 2 characterized by the above-mentioned. A rolling mill for joint shaping of steel sheet piles having joints at both ends in the width direction,
Doing one or both of edging and bending with respect to the joint of the substantially steel sheet pile-shaped intermediate cross-section material formed in the intermediate rolling mill, and having a pair of double rolls arranged on the left and right of the intermediate cross-section material,
A steel sheet pile joint characterized in that the double roll pair is engraved with a hole-type pair that surrounds only the entire joint and the vicinity thereof and does not contact the web and flange of the intermediate cross-section material. Shaping mill for shaping. The double roll pair is engraved with a hole-type pair that surrounds only the entire joint of the intermediate cross-section member and the vicinity thereof, and does not contact the web and flange of the intermediate cross-section member.
The steel sheet pile joint shaping mill according to claim 4, wherein each pitch line of the hole pair is configured to pass through each of the joints during joint shaping. Each of the double roll pairs disposed on the left and right of the intermediate cross-section member has a configuration in which one or both of the upper roll shaft and the lower roll shaft of each of the double roll pairs are inclined at a predetermined angle with respect to the horizontal direction. The rolling mill for joint shaping of steel sheet piles according to claim 5.

Images