JP3709889B1 - Manufacturing method of hat-type steel sheet pile - Google Patents

Manufacturing method of hat-type steel sheet pile Download PDF

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JP3709889B1
JP3709889B1 JP2004274403A JP2004274403A JP3709889B1 JP 3709889 B1 JP3709889 B1 JP 3709889B1 JP 2004274403 A JP2004274403 A JP 2004274403A JP 2004274403 A JP2004274403 A JP 2004274403A JP 3709889 B1 JP3709889 B1 JP 3709889B1
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sheet pile
steel sheet
arm
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JP2006088176A (en
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啓徳 三浦
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JFE Steel Corp
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Abstract

【課題】外向き爪側に突条を有するハット型鋼矢板を圧延により突条のつぶれや腕部の変形なく製造でき、ロールの強度も確保できる、ハット型鋼矢板の製造方法を提供する。
【解決手段】継手部４の外向き爪４１側に、継手噛合わせ中心点を腕部厚さ範囲内に位置せしめかつ逆Ｕ姿勢の左右を水平に保たしめる突条５を有するハット型鋼矢板を、孔型ロールを用いた逆Ｕ姿勢の粗圧延、中間圧延、仕上圧延の順次成形圧延工程により製造するにあたり、少なくとも中間圧延工程で、被圧延鋼材の腕部３をＶ字状に持ち上げ、該腕部とフランジ２との連接部６が最下端となる形状で圧延した後、最終パスを含む１パス以上で腕部を水平に戻すことを特徴とするハット型鋼矢板の製造方法。
【選択図】 図１Provided is a method for manufacturing a hat-type steel sheet pile, in which a hat-type steel sheet pile having a protrusion on the side of an outward claw can be manufactured by rolling without collapse of the protrusion or deformation of the arm portion, and the strength of the roll can be secured.
Outwardly pawl 4 1 side A joint 4, hat-type metal having a protrusion 5 which occupies maintained horizontally left and right positions allowed and inverted U position in the arm portion thickness range of joint meshing center point In manufacturing the sheet pile by the sequential forming and rolling process of reverse U posture rough rolling, intermediate rolling, and finish rolling using a perforated roll, the arm 3 of the steel material to be rolled is lifted into a V shape at least in the intermediate rolling process. A method for manufacturing a hat-type steel sheet pile, wherein the arm part is returned to a horizontal position in one or more passes including the final pass after rolling in a shape in which the connecting part 6 between the arm part and the flange 2 is the lowest end.
[Selection] Figure 1

Description

本発明は、ハット型鋼矢板の製造方法に関し、詳しくは土木建築分野の工事に用いられる左右非対称形状の継手を有するハット型鋼矢板の熱間圧延で有利に製造する、ハット型鋼矢板の製造方法に関する。   The present invention relates to a method for manufacturing a hat-type steel sheet pile, and more particularly to a method for manufacturing a hat-type steel sheet pile that is advantageously manufactured by hot rolling of a hat-type steel sheet pile having a left-right asymmetrical joint used for construction in the field of civil engineering and construction.

左右非対称形状の継手部を有するハット型鋼矢板として、ウエブとその両側のフランジとがＵ型をなし、左右のフランジ端にウエブ面と平行な腕部を有し、左右の腕部のいずれか一方の端には外向き爪（爪先端が反ウエブ側に向いた爪）、他方の端には内向き爪（爪先端がウエブ側に向いた爪）からなる左右で非対称な形状の継手部を有するものが知られている（例えば特許文献１）。   As a hat-type steel sheet pile having a left-right asymmetrical joint, the web and the flanges on both sides are U-shaped, and the left and right flange ends have arm portions parallel to the web surface. The left and right asymmetrical joints are formed with outward claws (the claws with the claw tip facing the anti-web side) at the end of the, and inward claws (claws with the claw tip facing the web side) at the other end. What has it is known (for example, patent document 1).

上記ハット型鋼矢板では、圧延の容易さの点で、内向き爪と外向き爪とは、可能な限り互いに点対称な形状とするのが好ましい。しかし、図２（ａ）に示すように、継手噛合わせ中心点４Ｃが腕部厚さ範囲７を外れるような形状であると、打設時に作用する力が腕部３を介して継手部４にモーメントを生じ、爪４１、４２が変形する虞がある。これを防止するためには、図２（ｂ）に示すように、外向き爪４１側に外側（反ウエブ側）に張出した突条５を有する形状とし、内向き爪４２は好ましくは外向き爪４１と略点対称な形状としたものが望ましい。 In the hat-type steel sheet pile, it is preferable that the inward claws and the outward claws have a point-symmetric shape as much as possible from the viewpoint of ease of rolling. However, as shown in FIG. 2 (a), the joint mesh engagement center point 4 C is in shape as outside the arm portion thickness range 7, the force acting on the droplet設時via the arm portion 3 joint There is a possibility that a moment is generated in 4 and the claws 4 1 and 4 2 are deformed. To prevent this, as shown in FIG. 2 (b), a shape having a protrusion 5 which issued outside (opposite web side) Zhang outwardly pawl 4 1 side, the inward claws 4 2 is preferably those with outward claws 4 1 substantially point symmetrical shape is preferred.

このような突条を有するハット型鋼矢板は、熱間圧延で製造する際、製品の腕部が水平なので、熱間圧延の孔型全般にわたって、例えば図３に示すように、腕部３を水平にして圧延されていた。すなわち、逆Ｕ姿勢で圧延する際、左右の水平が保てるように、突条５の高さΔｈを確保し、自重の約１/２を突条５の先端で受けながら、圧延ライン上での搬送を行っていた。なお、製品のウエブ、フランジ、腕部、継手部、爪の各部分に対応する圧延途中の被圧延鋼材の各部分は、これを製品の対応部分と同じ名称で呼ぶ、すなわち、ウエブ、フランジ、腕部、継手部、爪と呼び、これに同じ符号を付すものとする。
特許第２６８９７９４号公報 When the hat-type steel sheet pile having such ridges is manufactured by hot rolling, since the arm portion of the product is horizontal, the arm portion 3 is horizontally disposed over the entire hot rolling die, for example, as shown in FIG. It was rolled. That is, when rolling in the reverse U posture, the height Δh of the ridge 5 is secured so that the left and right sides can be maintained, and about 1/2 of its own weight is received at the tip of the ridge 5 while on the rolling line. I was carrying it. In addition, each part of the rolled steel material in the middle of rolling corresponding to each part of the web, flange, arm part, joint part, and claw of the product is called with the same name as the corresponding part of the product, that is, the web, the flange, It is called an arm part, a joint part, and a claw, and shall be given the same symbol.
Japanese Patent No. 2687794

しかしながら、上記のような圧延方法では、腕部の両端の継手部で被圧延鋼材の自重を支えるので、搬送姿勢は安定するものの、粗圧延ないし中間圧延では、材料の長さが短く、単重が大きい上に鋼材の温度が高いため、突条がつぶれやすいという問題や、また腕部が長くなると、圧延中に腕部が曲げられ、斜めに変形するという問題がある。また、突条がない場合に比べ、孔型ロールの突条およびその反対側の爪底の部分の孔型深さを、突条の高さΔｈだけ深くする必要があるため、圧延ロールの最小径が小さくなって、ロールに必要な強度の確保が難しくなる問題もある。   However, in the rolling method as described above, since the weight of the steel material to be rolled is supported by the joint portions at both ends of the arm portion, the conveying posture is stable, but in rough rolling or intermediate rolling, the length of the material is short, In addition, since the temperature of the steel material is high and the temperature of the steel material is high, there is a problem that the ridge is liable to be crushed and there is a problem that if the arm part becomes long, the arm part is bent during rolling and deformed obliquely. In addition, compared to the case where there is no protrusion, the hole depth of the protrusion of the hole roll and the nail bottom portion on the opposite side needs to be increased by the height Δh of the protrusion, so that There is also a problem that the small diameter becomes small and it is difficult to secure the strength required for the roll.

本発明は、上記従来技術の問題を解決し、外向き爪側に突条を有するハット型鋼矢板を圧延により突条のつぶれや腕部の変形なく製造でき、ロールの強度も確保できる、ハット型鋼矢板の製造方法を提供することを目的とする。   The present invention solves the above-described problems of the prior art, and can produce a hat-type steel sheet pile having a ridge on the side of the outward claw without rolling the ridge or deforming the arm, and can ensure the strength of the roll. It aims at providing the manufacturing method of a sheet pile.

本発明者は、鋭意検討の結果、予め腕部を、変形する限界まで変形させておくことにより、突条が受ける圧力を軽減でき、かつロール孔型の深さを浅くし、最小ロール径を大きくしてロール強度を確保することができることに想到し、本発明をなした。   As a result of intensive studies, the inventor has previously reduced the pressure applied to the ridges by deforming the arm portion to the limit of deformation, and the depth of the roll hole mold is reduced, and the minimum roll diameter is reduced. The inventors have conceived that the roll strength can be secured by increasing the size, and the present invention has been made.

すなわち、本発明は、ウエブ両側のフランジ端に腕部を介して左右非対称な継手部を有し、該継手部の外向き爪側に、継手噛合わせ中心点を腕部厚さ範囲内に位置せしめかつ逆Ｕ姿勢の左右を水平に保たしめる突条を有するハット型鋼矢板を、孔型ロールを用いた逆Ｕ姿勢の粗圧延、中間圧延、仕上圧延の順次成形圧延工程により製造するにあたり、少なくとも中間圧延工程で、被圧延鋼材の腕部をＶ字状に持ち上げ、該腕部とフランジとの連接部が最下端となる形状で圧延した後、最終パスを含む１パス以上で腕部を水平に戻すことを特徴とするハット型鋼矢板の製造方法である。   That is, the present invention has a joint part that is asymmetrical via the arm part at the flange ends on both sides of the web, and the joint engagement center point is located within the arm part thickness range on the outward claw side of the joint part. In producing a hat-type steel sheet pile having a ridge that keeps the right and left sides of the reverse U posture horizontally, by the rolling and rolling steps in the reverse U posture rough rolling, intermediate rolling and finish rolling using a perforated roll. At least in the intermediate rolling process, the arm portion of the steel material to be rolled is lifted in a V shape, rolled in a shape in which the connecting portion between the arm portion and the flange is the lowermost end, and then the arm portion is formed in one or more passes including the final pass. It is the manufacturing method of the hat-type steel sheet pile characterized by returning horizontally.

本発明では、腕部を水平に戻すパスは、仕上圧延のパスとすることが好ましい。   In the present invention, it is preferable that the pass for returning the arms to the horizontal is a finish rolling pass.

また、本発明は、ウエブ両側のフランジ端に腕部を介して左右非対称な継手部を有し、該継手部の外向き爪側に、継手噛合わせ中心点を腕部厚さ範囲内に位置せしめかつ逆Ｕ姿勢の左右を水平に保たしめる突条を有するハット型鋼矢板を、孔型ロールを用いたＵ姿勢の粗圧延、中間圧延、仕上圧延の順次成形圧延工程により製造するにあたり、少なくとも中間圧延工程で、被圧延鋼材の腕部を逆Ｖ字状に折り曲げ、該腕部とフランジとの連接部が最上端となる形状で圧延した後、最終パスを含む１パス以上で腕部を水平に戻すことを特徴とするハット型鋼矢板の製造方法である。   Further, the present invention has a joint part that is asymmetrical via the arm part at the flange ends on both sides of the web, and the joint engagement center point is located within the arm part thickness range on the outward claw side of the joint part. At the time of producing a hat-type steel sheet pile having a ridge that keeps the right and left sides of the reverse and U-shaped postures in a sequential forming and rolling process of rough rolling, intermediate rolling, and finish rolling using U-shaped rolls, at least In the intermediate rolling process, the arm portion of the steel material to be rolled is bent in an inverted V shape, rolled in a shape in which the connecting portion between the arm portion and the flange is the uppermost end, and then the arm portion is formed in one or more passes including the final pass. It is the manufacturing method of the hat-type steel sheet pile characterized by returning horizontally.

本発明によれば、次のような優れた効果を奏する。
１）逆Ｕ姿勢の圧延では、突条がつぶれないので安定した寸法・形状のハット型鋼矢板が得られる。
２）自重による腕部の曲がり変形が生じないよう、最初から変形限界相当の形状としたから、製造（圧延ないし搬送）中に形状が乱れてガイドと一致しなくなるようなことがなく、搬送および次パスへの噛込み等の誘導性に優れる。
３）ロールの最小径を大きくでき、ロールの使用可能範囲が拡大する。 According to the present invention, the following excellent effects can be obtained.
1) In rolling in a reverse U posture, the ridge is not crushed, so that a hat-type steel sheet pile having a stable size and shape can be obtained.
2) Since it has a shape corresponding to the deformation limit from the beginning so as not to cause bending deformation of the arm due to its own weight, the shape is not disturbed during manufacturing (rolling or conveying) and does not match the guide. Excellent inductivity such as biting into the next pass.
3) The minimum roll diameter can be increased and the usable range of the roll is expanded.

従来の逆Ｕ姿勢の圧延では、図３に示したように、腕部３を水平にして圧延していた。この圧延方法では、圧延パス間あるいは搬送中、被圧延鋼材の自重の約１/２が突条５にかかるため、突条５には単位長さ１ｍ、単位幅１ｍｍあたり、次式：
（被圧延鋼材の単位長さ１ｍあたりの自重（ｋｇｆ/ｍ）/２）/単位長さ１ｍの突条先端の面積（ｍ・ｍｍ）
で算出される値程度の圧力（ｋｇｆ/ｍｍ）がかかる。なお、１ｋｇｆ＝９．８Ｎである。この圧力が被圧延鋼材の材料強度に依存する突条単位幅１ｍｍあたりの耐圧力（材料強度（ｋｇｆ/ｍｍ２）×１ｍｍ）よりも低ければ突条５がつぶれることはないが、通常の熱間圧延の粗圧延から中間圧延にかけての段階では、材料温度が例えば７５０℃程度以上と高いため材料強度は低く（例えば常温強度５０ｋｇｆ/ｍｍ２の鋼材の７５０℃での材料強度は約１０ｋｇｆ/ｍｍ２→突条単位幅１ｍｍあたりの耐圧力は約１０ｋｇｆ/ｍｍ）、一方、同段階では材料の肉厚が厚くて単位長さあたりの自重が大きい（例えば１３１ｋｇ/ｍ）ため突条５にかかる圧力は大きい（例えば約１１ｋｇｆ/ｍｍ）。そのため、突条５にかかる圧力が耐圧力を上回って、突条５がつぶれる可能性が高い。また、両端の二点のみで支持しているため、圧延途中で腕部３が、ウエブ１およびフランジ２の重量に耐えきれずに、図３に二点鎖線で示すように屈曲変形し、次パスへの噛込み不良につながる虞もある。 In the conventional rolling in the reverse U posture, as shown in FIG. 3, the arm portion 3 is horizontal and rolled. In this rolling method, about 1/2 of the own weight of the steel material to be rolled is applied to the ridge 5 between rolling passes or during conveyance. Therefore, the ridge 5 has a unit length of 1 m and a unit width of 1 mm per the following formula:
(Rolling steel material's own weight per 1m unit length (kgf / m) / 2) / Area of ridge tip with unit length 1m (m · mm)
The pressure (kgf / mm) about the value calculated by Note that 1 kgf = 9.8 N. If this pressure is lower than the pressure resistance per 1 mm unit width of the protrusions (material strength (kgf / mm 2 ) × 1 mm) depending on the material strength of the steel material to be rolled, the protrusions 5 will not be crushed. At the stage from the rough rolling to the intermediate rolling of the intermediate rolling, the material temperature is high, for example, about 750 ° C. or higher, so the material strength is low (for example, the material strength at 750 ° C. of the steel material having a normal temperature strength of 50 kgf / mm 2 is about 10 kgf / mm). 2 → Protrusion pressure per 1 mm of protrusion unit width is about 10 kgf / mm). On the other hand, at the same stage, the material is thick and its weight per unit length is large (eg 131 kg / m). The pressure is large (for example, about 11 kgf / mm). Therefore, it is highly possible that the pressure applied to the ridge 5 exceeds the pressure resistance and the ridge 5 is crushed. Further, since it is supported by only two points at both ends, the arm 3 cannot endure the weight of the web 1 and the flange 2 during rolling, and is bent and deformed as shown by a two-dot chain line in FIG. There is also a risk of poor biting in the path.

これに対し、本発明の逆Ｕ姿勢の圧延では、少なくとも中間圧延工程で、例えば図１に示すように、被圧延鋼材の腕部３をＶ字状に持ち上げ、該腕部３とフランジ２との連接部６が最下端となる形状で圧延する。このような特定形状での圧延により、被圧延鋼材の自重は前記連接部６が担うことになるから、突条５に圧力がほとんどかからなくなってそのつぶれは回避され、かつ腕部３の変形も回避される。なお、この特定形状（腕部３とフランジ２との連接部６が最下端となる形状）は、図３において腕部３が屈曲変形した後の形状に対応し、それ以上変形が進行しない変形限界形状に相当するものといえる。上記特定形状での圧延が中間圧延工程の少なくとも一部で行われないと、突条のつぶれや腕部の変形を防ぐのは困難であるから、上記特定形状での圧延は、中間圧延工程の少なくとも一部で行う必要がある。なお、これに加えて、さらに粗圧延および/または仕上圧延工程の少なくとも一部において、必要に応じて上記特定形状での圧延を行ってもかまわない。もっとも、最終製品の腕部は水平であるから、最終パスのみ、あるいは最終パスおよびその前の数パスの圧延により、腕部を水平に戻す必要がある。   On the other hand, in the rolling of the reverse U posture of the present invention, at least in the intermediate rolling process, as shown in FIG. 1, for example, the arm portion 3 of the steel material to be rolled is lifted in a V shape, and the arm portion 3 and the flange 2 The connecting part 6 is rolled in a shape that is the lowest end. Due to the rolling in such a specific shape, the weight of the steel material to be rolled is borne by the connecting portion 6, so that pressure is hardly applied to the ridge 5, and the crushing is avoided, and the deformation of the arm portion 3. Is also avoided. This specific shape (the shape in which the connecting portion 6 between the arm portion 3 and the flange 2 is the lowest end) corresponds to the shape after the arm portion 3 is bent and deformed in FIG. It can be said that it corresponds to a limit shape. If rolling in the specific shape is not performed in at least a part of the intermediate rolling process, it is difficult to prevent crushing of the ridges and deformation of the arm portion. Must be done at least in part. In addition, in addition to this, rolling in the specific shape may be performed as necessary in at least a part of the rough rolling and / or finish rolling process. However, since the arm part of the final product is horizontal, it is necessary to return the arm part to the horizontal only by the final pass or by rolling the final pass and several passes before it.

この腕部水平戻し圧延は、仕上圧延工程で行うことが好ましい。というのは、仕上圧延の段階では、通常、材料温度が７００℃以下となって大抵の鋼材では材料強度が１０ｋｇf/ｍｍ２以上（突条の耐圧力でいうと１０ｋｇf/ｍｍ以上）となり、一方、圧延による延伸により単位長さ当たりの自重が軽くなって、腕部水平戻し圧延後の突条５の単位長さ１ｍ、単位幅１ｍｍにかかる圧力がほとんどの場合１０ｋｇｆ/ｍｍを下回るようになるため、突条において「圧力＜耐圧力」の条件が満たされ、目立ったつぶれは生じなくなるからである。 This arm part horizontal reverse rolling is preferably performed in a finish rolling process. This is because, at the stage of finish rolling, the material temperature is usually 700 ° C. or lower, and in most steel materials, the material strength is 10 kgf / mm 2 or more (10 kgf / mm or more in terms of the pressure resistance of the ridge), The weight per unit length is reduced by stretching by rolling, and the pressure applied to the unit length of 1 m and the unit width of 1 mm of the ridge 5 after the horizontal return rolling of the arm is almost less than 10 kgf / mm. For this reason, the condition of “pressure <pressure resistance” is satisfied in the ridge, and conspicuous crushing does not occur.

また、図１と図３との比較から判るように、本発明では従来に比べ、ロールの孔型深さを突条高さΔｈ分だけ浅くすることができる。したがって、ロールの最小径を大きくでき、ロールの使用可能範囲が拡大する。   As can be seen from a comparison between FIG. 1 and FIG. 3, in the present invention, the hole depth of the roll can be made shallower by the protrusion height Δh than in the prior art. Therefore, the minimum diameter of the roll can be increased, and the usable range of the roll is expanded.

なお、本発明のＵ姿勢の圧延では、突条５のつぶれはもともと回避されているが、腕部３の変形の回避およびロールの使用可能範囲の拡大は、逆Ｕ姿勢の圧延と同様に可能である。   In the rolling of the U posture of the present invention, the collapse of the ridge 5 is originally avoided, but the deformation of the arm 3 and the usable range of the roll can be expanded in the same manner as the rolling of the reverse U posture. It is.

実施例では、被圧延鋼材の断面形状を図４に示すように推移させるべく、粗圧延には孔型Ｋ８、Ｋ７、中間圧延には孔型Ｋ６〜Ｋ３、仕上圧延には孔型Ｋ２、Ｋ１を用いた。これらの孔型は、図５に示すように配置される粗圧延ロール１０、第１中間圧延ロール１１、第２中間圧延ロール１２、仕上圧延ロール１３に分配して用いた。粗圧延ロール１０には孔型Ｋ８、Ｋ７を、第１中間圧延ロール１１には孔型Ｋ５、Ｋ４を、第２中間圧延ロール１２には孔型Ｋ６、Ｋ３を、仕上圧延ロール１３には孔型Ｋ２、Ｋ１を、それぞれロール軸方向に並列に刻設した。孔型Ｋ８〜Ｋ１をＫ番号の降順に用い、適宜被圧延鋼材の逆送を交えて、１孔型あたり１〜２パスとして圧延を行った。   In the examples, in order to change the cross-sectional shape of the steel material to be rolled as shown in FIG. 4, the hole types K8 and K7 for rough rolling, the hole types K6 to K3 for intermediate rolling, and the hole types K2 and K1 for finish rolling. Was used. These hole molds were distributed and used for a rough rolling roll 10, a first intermediate rolling roll 11, a second intermediate rolling roll 12, and a finishing rolling roll 13 arranged as shown in FIG. The rough rolling roll 10 has hole types K8 and K7, the first intermediate rolling roll 11 has hole types K5 and K4, the second intermediate rolling roll 12 has hole types K6 and K3, and the finishing rolling roll 13 has holes. The molds K2 and K1 were each engraved in parallel in the roll axis direction. The perforations K8 to K1 were used in descending order of the K numbers, and rolled as 1 to 2 passes per perforation by appropriately feeding the steel material to be rolled back.

図４に示すように、実施例では、粗圧延のＫ８から中間圧延のＫ３まで、フランジ２と腕部３の連接部６が最下端となるように、腕部３をＶ字状に持ち上げ、連接部６を突条３の先端および内向き爪４２側の爪底のレベルと略一致させた孔型で圧延するようにした。仕上圧延のＫ２のところでは、被圧延鋼材の温度が約７００℃に低下し、被圧延鋼材の高温強度が１０ｋｇｆ/ｍｍ２（突条の幅１ｍｍあたりの耐圧力にして１０ｋｇｆ/ｍｍ）を超えて、変形しにくくなる。また、Ｋ８〜Ｋ３を図４に示したものに代えて腕部が水平になる従来の孔型とした場合について突条にかかる圧力を計算した結果を表１に示すように、被圧延鋼材の単重（単位長さ１ｍ当たりの重量）は、圧延での延伸により軽くなっており、Ｋ２、Ｋ１では、突条先端幅１ｍｍあたりにかかる圧力が９．８ｋｇｆ/ｍｍ程度以下と、耐圧力を下回るので、目だったつぶれは生じなくなる。 As shown in FIG. 4, in the example, from the rough rolling K8 to the intermediate rolling K3, the arm portion 3 is lifted in a V shape so that the connecting portion 6 of the flange 2 and the arm portion 3 becomes the lowest end, and so that rolling level and grooved which substantially matched at the tip of the connecting portion 6 projecting 3 and inward claws 4 2 side of the claw bottom. At the finish rolling K2, the temperature of the steel material to be rolled decreases to about 700 ° C., and the high temperature strength of the steel material to be rolled exceeds 10 kgf / mm 2 (10 kgf / mm as the pressure resistance per 1 mm width of the ridge). It becomes difficult to deform. In addition, as shown in Table 1, the results of calculating the pressure applied to the ridges in the case where K8 to K3 are replaced with those shown in FIG. The unit weight (weight per unit length of 1 m) is lightened by stretching by rolling. With K2 and K1, the pressure applied per 1 mm of the protrusion tip width is about 9.8 kgf / mm or less, and the pressure resistance is as low as possible. As it falls below, there will be no noticeable collapse.

Figure 0003709889
Figure 0003709889

また、例えばＫ４の孔型ロール部分について、図６に示す従来例（ａ）と実施例（ｂ）とのロール径方向寸法記号間には次のような関係が成り立つ。ここで、従来例と実施例とは、孔型のフランジ通し部と腕部通し部との交叉角度が相違する以外は、同一孔型形状である。   For example, the following relationship is established between the roll radial dimension symbols of the conventional example (a) and the example (b) shown in FIG. Here, the conventional example and the example have the same hole shape except that the crossing angle of the hole-type flange passing portion and the arm portion passing portion is different.

ｄ１min＝Ｄ１−Ｈ１
Ｄ１＝ｄmax−２×ｈ１
Ｈ２＝Ｈ１−Δｈ
ｈ２≒ｈ１−Δｈ/２
Ｄ２＝ｄmax−２×ｈ２＝Ｄ１＋２×ｈ１−２×（ｈ１−Δｈ/２）＝Ｄ１＋Δｈ
ｄ２min＝Ｄ２−Ｈ２＝（Ｄ１＋Δｈ）−（Ｈ１−Δｈ）＝Ｄ１−Ｈ１＋２×Δｈ
＝ｄ１min＋２×Δｈ
よって、実施例では従来例よりもロール最小径ｄ２minが突条高さΔｈの２倍分大きくなる。具体的な値を示すと、従来例の、Δｈ≒１５ｍｍ、ｄmax＝１４８０ｍｍφ（これら２つは実施例でも同じ）、Ｈ１＝３２４ｍｍ、ｈ１＝１６０ｍｍ、Ｄ１＝１１６０ｍｍφ、ｄ１min＝８３６ｍｍφに対し、実施例では、Ｈ２＝３０９ｍｍ、ｈ２＝１５２．５ｍｍ、Ｄ２＝１１７５ｍｍφ、ｄ２min＝８６６ｍｍφである。すなわち、実施例では、ロール強度上必要な径を例えば８００ｍｍφとした場合、ロール使用可能範囲が、従来例の３６ｍｍから実施例の６６ｍｍへと、従来例の約１８０％に拡大する。 d 1 min = D 1 −H 1
D 1 = dmax−2 × h 1
H 2 = H 1 −Δh
h 2 ≒ h 1 -Δh / 2
D 2 = dmax−2 × h 2 = D 1 + 2 × h 1 −2 × (h 1 −Δh / 2) = D 1 + Δh
d 2 min = D 2 −H 2 = (D 1 + Δh) − (H 1 −Δh) = D 1 −H 1 + 2 × Δh
= D 1 min + 2 × Δh
Therefore, in the embodiment, the minimum roll diameter d 2 min is larger by twice the protrusion height Δh than the conventional example. Specifically, Δh≈15 mm, dmax = 1480 mmφ of the conventional example (these two are the same in the embodiment), H 1 = 324 mm, h 1 = 160 mm, D 1 = 1160 mmφ, d 1 min = 836 mmφ On the other hand, in the example, H 2 = 309 mm, h 2 = 152.5 mm, D 2 = 1175 mmφ, d 2 min = 866 mmφ. That is, in the embodiment, when the diameter required for the roll strength is set to, for example, 800 mmφ, the roll usable range is expanded from 36 mm of the conventional example to 66 mm of the embodiment to about 180% of the conventional example.

また、ロール孔型を上下入れ替えることにより、Ｕ姿勢の圧延も可能であり、ロール使用範囲は同様に拡大できた。   Moreover, by rolling the roll hole mold up and down, rolling in a U posture was possible, and the roll usage range could be expanded similarly.

本発明は、ハット型鋼矢板を圧延により製造し、さらには使用する産業に利用できる。   INDUSTRIAL APPLICABILITY The present invention can be used for industries in which a hat-type steel sheet pile is manufactured by rolling.

本発明の１例を示す圧延途中の被圧延鋼材の断面図である。It is sectional drawing of the to-be-rolled steel material in the middle of rolling which shows one example of this invention. 外向き爪側に突条を有しない場合(ａ)と有する場合（ｂ）の継手嵌合状態を示す断面図である。It is sectional drawing which shows the joint fitting state of the case where it does not have a protrusion on the outward nail | claw side, and it has (b). 従来の１例を示す圧延途中の被圧延鋼材の断面図である。It is sectional drawing of the steel material to be rolled in the middle of rolling which shows a conventional example. 実施例に用いたロール孔型系列を示す被圧延鋼材断面形状推移図である。It is a rolling steel cross-sectional shape transition diagram which shows the roll hole type series used for the Example. 実施例に用いた圧延ロールの配置を示す平面図である。It is a top view which shows arrangement | positioning of the rolling roll used for the Example. Ｋ４の孔型ロール部分における従来例（ａ）と実施例（ｂ）とのロール径方向寸法記号間の関係を説明する断面図である。It is sectional drawing explaining the relationship between the roll radial direction dimension symbol of the prior art example (a) and Example (b) in the hole-type roll part of K4.

符号の説明Explanation of symbols

１ ウエブ
２ フランジ
３ 腕部
４ 継手部
４１ 爪（外向き爪）
４２ 爪（内向き爪）
４Ｃ 継手噛合わせ中心点
５ 突条
６ 連接部
７ 腕部厚さ範囲
１０ 粗圧延ロール
１１ 第１中間圧延ロール
１２ 第２中間圧延ロール
１３ 仕上圧延ロール 1 web 2 flange 3 arms 4 joints 4 1 claw (outward claw)
4 2 nails (inward nails)
4 C joint meshing center 5 Projection 6 Joint 7 Arm thickness range 10 Coarse rolling roll 11 First intermediate rolling roll 12 Second intermediate rolling roll 13 Finishing rolling roll

Claims (3)

ウエブ両側のフランジ端に腕部を介して左右非対称な継手部を有し、該継手部の外向き爪側に、継手噛合わせ中心点を腕部厚さ範囲内に位置せしめかつ逆Ｕ姿勢の左右を水平に保たしめる突条を有するハット型鋼矢板を、孔型ロールを用いた逆Ｕ姿勢の粗圧延、中間圧延、仕上圧延の順次成形圧延工程により製造するにあたり、少なくとも中間圧延工程で、被圧延鋼材の腕部をＶ字状に持ち上げ、該腕部とフランジとの連接部が最下端となる形状で圧延した後、最終パスを含む１パス以上で腕部を水平に戻すことを特徴とするハット型鋼矢板の製造方法。   There are asymmetrical joints on the flange ends on both sides of the web via the arms, and the joint meshing center point is positioned within the arm thickness range on the outward claw side of the joints and has a reverse U posture. In producing a hat-type steel sheet pile having a ridge that keeps the left and right horizontal, in the reverse U-position rough rolling using a perforated roll, intermediate rolling, and finish rolling in the sequential forming rolling process, at least in the intermediate rolling process, The arm portion of the steel to be rolled is lifted in a V shape, rolled in a shape in which the connecting portion between the arm portion and the flange is the lowermost end, and then returned to the horizontal position in one or more passes including the final pass. A manufacturing method of a hat-type steel sheet pile. 前記腕部を水平に戻すパスを、仕上圧延のパスとしたことを特徴とする請求項１記載のハット型鋼矢板の製造方法。   The method for manufacturing a hat-type steel sheet pile according to claim 1, wherein the path for returning the arm part horizontally is a path for finish rolling. ウエブ両側のフランジ端に腕部を介して左右非対称な継手部を有し、該継手部の外向き爪側に、継手噛合わせ中心点を腕部厚さ範囲内に位置せしめかつ逆Ｕ姿勢の左右を水平に保たしめる突条を有するハット型鋼矢板を、孔型ロールを用いたＵ姿勢の粗圧延、中間圧延、仕上圧延の順次成形圧延工程により製造するにあたり、少なくとも中間圧延工程で、被圧延鋼材の腕部を逆Ｖ字状に折り曲げ、該腕部とフランジとの連接部が最上端となる形状で圧延した後、最終パスを含む１パス以上で腕部を水平に戻すことを特徴とするハット型鋼矢板の製造方法。   There are asymmetrical joints on the flange ends on both sides of the web via the arms, and the joint meshing center point is positioned within the arm thickness range on the outward claw side of the joints and has a reverse U posture. When manufacturing a hat-type steel sheet pile having ridges that keep the left and right horizontal by a sequential forming and rolling process of rough rolling, intermediate rolling, and finishing rolling using a U-shaped roll using a perforated roll, at least in the intermediate rolling process, Bending the arm part of the rolled steel material into an inverted V shape, rolling it in a shape where the connecting part between the arm part and the flange is the uppermost end, and then returning the arm part to the horizontal state in one or more passes including the final pass A manufacturing method of a hat-type steel sheet pile.
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