JP4830255B2 - Method for manufacturing hat-shaped steel sheet pile having asymmetrical joint and claw bending apparatus used therefor - Google Patents

Method for manufacturing hat-shaped steel sheet pile having asymmetrical joint and claw bending apparatus used therefor Download PDF

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JP4830255B2
JP4830255B2 JP2003385659A JP2003385659A JP4830255B2 JP 4830255 B2 JP4830255 B2 JP 4830255B2 JP 2003385659 A JP2003385659 A JP 2003385659A JP 2003385659 A JP2003385659 A JP 2003385659A JP 4830255 B2 JP4830255 B2 JP 4830255B2
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steel sheet
sheet pile
joint
roller
hat
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JP2005144496A (en
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啓徳 三浦
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JFE Steel Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02P20/00—Technologies relating to chemical industry
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Description

本発明は、土木分野や建築分野の工事によく用いられる左右非対称形状の継手を有するハット形鋼矢板の製造に関する。   The present invention relates to the production of a hat-shaped steel sheet pile having a left-right asymmetrical joint that is often used in construction in the civil engineering field and the building field.

ハット形鋼矢板は、Ｕ形（あるいは略Ｕ形）鋼矢板の左右の継手とフランジ間に、ウエブに平行な継手支持部を設けて、鋼矢板の有効幅を広くしたものである。かかるハット形鋼矢板としては、継手の断面形状を左右で非対称としたものが知られており、有効幅が６００ｍｍ以下の鋼矢板が土木分野や建築分野の工事によく用いられる。   The hat-shaped steel sheet pile is obtained by providing a joint support portion parallel to the web between the left and right joints of the U-shaped (or substantially U-shaped) steel sheet pile and the flange to widen the effective width of the steel sheet pile. As such a hat-shaped steel sheet pile, a cross-sectional shape of the joint is asymmetrical on the left and right, and a steel sheet pile having an effective width of 600 mm or less is often used for construction in the civil engineering and construction fields.

これを用いて構築した連接矢板壁はウエブが同じ側に面一揃う利点がある。その際、継手の寸法精度が悪い場合、継手同士の噛み合わせが弛めとなったり、反対にきつくなりすぎることになる。このため、左右非対称形状の継手を有するハット形鋼矢板を製造するに際しては、左右各々継手の寸法精度を良くする必要がある。   The connected sheet pile wall constructed using this has the advantage that the web is flush with the same side. At that time, if the dimensional accuracy of the joint is poor, the joint between the joints becomes loose, or conversely, it becomes too tight. For this reason, when manufacturing a hat-shaped steel sheet pile having a left-right asymmetrical joint, it is necessary to improve the dimensional accuracy of the left and right joints.

ところで従来技術では、特に有効幅が広い場合、寸法形状精度の良好な爪を有するハット形鋼矢板を製造することが困難であるという問題があった（特許文献１、２）。
特開平８−１１７８０１号公報 特開２００１−１０５００２号公報 By the way, in the prior art, particularly when the effective width is wide, there is a problem that it is difficult to manufacture a hat-shaped steel sheet pile having a claw with good dimensional shape accuracy (Patent Documents 1 and 2).
JP-A-8-117801 JP 2001-105002 A

特許文献１、２記載のハット形鋼矢板の製造方法では、熱間仕上圧延において左右非対称形状の爪曲げを、上下ロールの傾斜した壁の位置の変化で行っており、形状安定性が不足するし、孔型により爪曲げを施した場合、左右で爪曲げの方向が異なることに起因してねじれが発生し、鋼矢板全体の形状の悪化および継手の寸法精度が悪化する欠点があった。これを図６を用いて説明する。   In the manufacturing method of the hat-shaped steel sheet pile described in Patent Documents 1 and 2, the asymmetrical claw bending is performed by the change in the position of the inclined wall of the upper and lower rolls in hot finish rolling, and the shape stability is insufficient. However, when claw bending is performed with a hole mold, twisting occurs due to different claw bending directions on the left and right, and there is a drawback that the shape of the entire steel sheet pile deteriorates and the dimensional accuracy of the joint deteriorates. This will be described with reference to FIG.

図６は、上水平ロールによる一方の爪曲げ状態を示すが、他方の爪曲げは、この状態に対して上下反対の状態で行われる。図６中、実線は、水平の斜面５１による爪５３の曲げ成形が開始される直前の時点を示し、２点鎖線は、斜面５２による爪５４の曲げ成形途中の時点を示す。矢印５６は、時間の経過に伴う、上水平ロールに形成された斜面の位置変化を示す。   FIG. 6 shows one nail bending state by the upper horizontal roll, and the other nail bending is performed in an upside down state with respect to this state. In FIG. 6, the solid line indicates the time immediately before the start of bending of the claw 53 by the horizontal slope 51, and the two-dot chain line indicates the time during the bending of the claw 54 by the slope 52. An arrow 56 indicates a change in the position of the slope formed on the upper horizontal roll over time.

すなわち、水平ロールを用いた熱間仕上圧延によりハット形鋼矢板の爪曲げを施した場合には、図６に示す如く、爪曲げに必要な押圧力５０の方向は、爪基部５５を支点とすると鋼矢板幅方向である。しかし、一方の水平ロールに形成された斜面５１と爪部５３外面が接触することにより、ハット形鋼矢板の爪曲げが孔型の斜面５１から５２への鋼矢板幅方向の位置変化により行われ、ロール中心よりかなり手前において爪部分だけの接触となるため、図７で示す製品の断面で見て１０７Ａに上向き、１０８Ｂに下向きの回転力が発生して全体が左方向に回転し、その結果、製品の形状および製品の継手部の開口部の寸法精度が悪化していたと考えられる。   That is, when the claw bending of the hat-shaped steel sheet pile is performed by hot finish rolling using a horizontal roll, the direction of the pressing force 50 required for claw bending is based on the claw base 55 as shown in FIG. Then, it is a steel sheet pile width direction. However, when the inclined surface 51 formed on one horizontal roll and the outer surface of the claw portion 53 are in contact with each other, the claw bending of the hat-shaped steel sheet pile is performed by the position change in the steel sheet pile width direction from the hole-shaped inclined surface 51 to 52. 7, since only the nail portion is in contact with the front of the roll center, a rotational force is generated upward 107A and downward 108B as viewed in the cross section of the product shown in FIG. It is considered that the shape accuracy of the product and the dimensional accuracy of the opening of the joint portion of the product were deteriorated.

なお、図７には、本発明により製造しようとする左右非対称形状の継手を有するハット形鋼矢板製品１００を例示した。ハット形鋼矢板製品１００は、断面で見て左右の継手１０５Ａ、１０５Ｂとフランジ１０４間にウエブ１０１に平行な継手支持部１０６を設けてある。ＢＷはウエブ幅、Ｈ０は全高さ、ｔＷはウエブ厚をそれぞれ示す。有効幅Ｂ０は、継手を嵌合させた時の施工ピッチに相当する長さである。 FIG. 7 illustrates a hat-shaped steel sheet pile product 100 having a left-right asymmetrical joint to be manufactured according to the present invention. The hat-shaped steel sheet pile product 100 is provided with a joint support portion 106 parallel to the web 101 between the left and right joints 105 </ b> A and 105 </ b> B and the flange 104 when viewed in cross section. B W represents the web width, H 0 represents the total height, and t W represents the web thickness. The effective width B 0 is a length corresponding to the construction pitch when the joint is fitted.

本発明は、上記従来技術の問題点を解消し、寸法形状精度の良い、左右非対称形状の継手を有するハット形鋼矢板の製造方法およびそれに用いる爪曲げ装置を提供することを目的とする。   An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a manufacturing method of a hat-shaped steel sheet pile having a right and left asymmetrical joint with good dimensional shape accuracy and a claw bending device used therefor.

本発明は、以下のとおりである。   The present invention is as follows.

１．左右非対称形状の継手を有するハット形鋼矢板の製造方法において、熱間仕上圧延により得た左右非対称形状の継手を有する爪曲げ前のハット形鋼矢板に対して、外側の竪ローラに設けた凹面を爪曲げに作用させ、内側の竪ローラでその反力を受けると共に、上下一対の水平ローラで継手支持部の上下方向位置を保持する爪曲げ装置を仕上圧延機の出側に配置して、該爪曲げ装置により、前記上下一対の水平ロールを介して前記継手支持部を所定の保持力で保持して座屈を防止しながら、前記外側の竪ロールの凹面を前記継手に押圧して左右の継手の爪曲げを少なくとも１回、施すことを特徴とする左右非対称形状の継手を有するハット形鋼矢板の製造方法である。 1. In the manufacturing method of a hat-shaped steel sheet pile having a left-right asymmetric shape joint, a concave surface provided on the outer scissors roller with respect to the hat-shaped steel sheet pile before claw bending having a right-left asymmetric shape joint obtained by hot finish rolling The nail bending device that acts on the nail bending and receives the reaction force by the inner heel roller and holds the vertical position of the joint support portion by a pair of upper and lower horizontal rollers is arranged on the exit side of the finishing mill, The claw bending device presses the concave surface of the outer scissors roll against the joint while holding the joint support portion with a predetermined holding force through the pair of upper and lower horizontal rolls to prevent buckling. This is a method for producing a hat-shaped steel sheet pile having a left-right asymmetrical joint, wherein the joint is bent at least once.

２．仕上圧延機の出側に配置され、左右非対称形状の継手を有するハット形鋼矢板を製造するための爪曲げ装置であって、前記継手の爪曲げに作用する凹面を設けた外側の竪ローラと、爪曲げ反力を受ける内側の竪ローラと、継手支持部の上下方向位置を所定の保持力で保持して座屈を防止する上下一対の水平ローラと、で４個のローラ群を構成し、該ローラ群を鋼矢板幅方向の左右にそれぞれ少なくとも１組、鋼矢板長手方向と直交する同一平面内に各ローラの軸芯を位置させて配置してなることを特徴とする左右非対称形状の継手を有するハット形鋼矢板の爪曲げ装置である。
2. A claw bending device for producing a hat-shaped steel sheet pile having a left-right asymmetrical joint disposed on the exit side of a finish rolling mill, comprising an outer scissors roller provided with a concave surface acting on the claw bending of the joint ; constitutes an inner vertical roller receiving the nail bending reaction force, the pair of upper and lower horizontal rollers to prevent buckling holds the vertical position of the joint support portion at a predetermined holding force, in the four rollers The left and right asymmetric shapes are characterized in that the roller groups are arranged at least one set on each of the left and right sides in the width direction of the steel sheet pile, and the axis of each roller is positioned in the same plane perpendicular to the longitudinal direction of the steel sheet pile. It is a claw bending device for a hat-shaped steel sheet pile having a joint.

本発明に係る左右非対称形状の継手を有するハット形鋼矢板の製造方法およびそれに用いる爪曲げ装置によれば、爪曲げを精度良く行うことができ、しかも形状を良好に保つことができ、寸法形状精度の良い製品を製造することができる。   According to the manufacturing method of a hat-shaped steel sheet pile having a left-right asymmetrical joint according to the present invention and the claw bending apparatus used therefor, the claw bending can be performed with high accuracy, and the shape can be kept good. Products with high accuracy can be manufactured.

先ず、図１、２を用い、本発明に係る左右非対称形状の継手を有するハット形鋼矢板（以下、ハット形鋼矢板ともいう）の製造方法について説明する。図１は、図２に示す本発明の実施の形態に係るハット形鋼矢板の爪曲げ装置１０（以下、単に爪曲げ装置１０ともいう）の要部を示す縦断面図である。   First, the manufacturing method of the hat-shaped steel sheet pile (henceforth a hat-shaped steel sheet pile) which has the joint of the left-right asymmetric shape based on this invention is demonstrated using FIG. FIG. 1 is a longitudinal sectional view showing a main part of a claw bending device 10 (hereinafter also simply referred to as a claw bending device 10) for a hat-shaped steel sheet pile according to the embodiment of the present invention shown in FIG.

図１中、符号１、２は竪ローラを示しており、竪ローラ１は、爪曲げに作用する外側の竪ローラであり、外側の竪ローラ１は、爪外面と接触する凹面を有する。竪ローラ２は、爪曲げ反力を受ける内側の竪ローラであり、フランジ４の傾き角θに合致した斜面を有している。また、符号３は、継手支持部６の上下方向位置を保持する上下一対の水平ローラである。図１、２中、θは、フランジ４の傾き角で、フランジ４と鋼矢板幅方向とのなす角度である。   In FIG. 1, reference numerals 1 and 2 denote wrinkle rollers. The wrinkle roller 1 is an outer wrinkle roller that acts on the claw bending, and the outer wrinkle roller 1 has a concave surface that comes into contact with the outer surface of the claw. The scissors roller 2 is an inner scissors roller that receives the claw bending reaction force, and has a slope that matches the inclination angle θ of the flange 4. Reference numeral 3 denotes a pair of upper and lower horizontal rollers that hold the vertical position of the joint support 6. 1 and 2, θ is an inclination angle of the flange 4 and is an angle formed by the flange 4 and the steel sheet pile width direction.

ハット形鋼矢板の爪７Ａの曲げは、上下一対の水平ローラ３で継手支持部６の上下方向位置を保持するようにして、外側の竪ローラ１を作用させ、それによって生じる爪曲げ反力を内側の竪ローラ２によって受けるように行われる。図１では、図２に示す爪曲げ装置１０の右側における爪７Ａの曲げ状態を示したが、爪曲げ装置１０の左側では、爪７Ｂの曲げが同時に同様にして行われている。   The claw 7A of the hat-shaped steel sheet pile is bent so that the outer scissor roller 1 acts by holding the joint support portion 6 in the vertical direction with the pair of upper and lower horizontal rollers 3, and the resulting claw bending reaction force is generated. It is performed so as to be received by the inner side roller 2. FIG. 1 shows the bent state of the claw 7A on the right side of the claw bending device 10 shown in FIG. 2, but on the left side of the claw bending device 10, the claw 7B is bent at the same time.

このように本発明に係るハット形鋼矢板の製造方法においては、後述する熱間仕上圧延により得た爪曲げ前のハット形鋼矢板に対して、上述した方法で左右の継手５Ａ、５Ｂの爪曲げを少なくとも１回、施すことを特徴とする。 Thus, in the manufacturing method of the hat-shaped steel sheet pile according to the present invention, the claws of the left and right joints 5A and 5B are obtained by the above-described method with respect to the hat-shaped steel sheet pile before claw bending obtained by hot finish rolling described later. The bending is performed at least once.

このようにして寸法形状精度の良い継手５Ａ、５Ｂを有するハット形鋼矢板製品を製造することができる理由は、以下のとおりである。   The reason why the hat-shaped steel sheet pile product having the joints 5A and 5B with good dimensional shape accuracy can be manufactured in this way is as follows.

図１、図２を参照しつつ説明すると、第１に、外側の竪ローラ１を爪曲げに作用する手段としたことで、爪７Ａ、爪７Ｂの爪曲げが、外側の竪ローラ１に形成した凹面の鋼矢板幅方向の位置変化により行われ、その結果、外側の竪ローラ１に形成した凹面を介して爪曲げに有効に作用する方向から押圧力を付与することができるようになり、爪曲げ時に、継手５Ａ、５Ｂのねじれの原因となる回転力を小さくできたことが挙げられる。その際、外側の竪ローラ１の鋼矢板幅方向位置は、所定の爪曲げ量を付与できる位置に予め設定されている。図１中、２点鎖線は曲げ成形前の爪を示す。   Referring to FIGS. 1 and 2, first, by using the outer heel roller 1 as a means for acting on the claw bending, the claw bending of the claw 7 </ b> A and the claw 7 </ b> B is formed on the outer heel roller 1. Is performed by the position change of the steel sheet pile width direction of the concave surface, as a result, it becomes possible to apply a pressing force from the direction that effectively acts on the claw bending through the concave surface formed on the outer scissors roller 1, It is mentioned that the rotational force that causes the torsion of the joints 5A and 5B can be reduced during the claw bending. At that time, the steel sheet pile width direction position of the outer side roller 1 is set in advance to a position where a predetermined claw bending amount can be given. In FIG. 1, a two-dot chain line indicates a nail before bending.

第２として、爪曲げ反力を内側の竪ローラ２によって正しく受けるようにしていることが挙げられる。なお、内側の竪ローラ２には、フランジ４の傾き角θに合致した斜面が形成されている。この結果、曲げ時の爪曲げ反力により、爪曲げ途中の爪が鋼矢板幅方向に水平移動してしまうことが防止でき、所定の爪曲げ量を付与できるようになる。   Secondly, the nail bending reaction force is correctly received by the inner heel roller 2. The inner side roller 2 is formed with a slope that matches the inclination angle θ of the flange 4. As a result, the nail bending reaction force during bending can prevent the nail in the middle of the nail bending from moving horizontally in the steel sheet pile width direction, and a predetermined nail bending amount can be provided.

第３として、継手支持部６の上下方向位置を保持する上下一対の水平ローラ３を設けたことが挙げられる。上下一対の水平ローラ３を設けない場合には、爪曲げ時に、爪位置が上下方向に変動してしまい、爪曲げを精度良く行うことができなくなる。そのうえ、継手支持部６の上下方向位置を保持する上下一対の水平ローラ３を設けない場合、爪曲げ時に、爪曲げ途中のハット形鋼矢板が鋼矢板幅方向の両側に配置された外側の竪ローラ１の押圧力により変形して、製品形状が悪化してしまうことにもなる。   Thirdly, a pair of upper and lower horizontal rollers 3 that hold the vertical position of the joint support 6 is provided. If the pair of upper and lower horizontal rollers 3 are not provided, the position of the nail fluctuates in the vertical direction when the nail is bent, and the nail bending cannot be performed with high accuracy. In addition, when the pair of upper and lower horizontal rollers 3 that hold the vertical position of the joint support portion 6 is not provided, the outer flanges in which the hat-shaped steel sheet piles in the middle of the claw bending are arranged on both sides in the steel sheet pile width direction when the claws are bent. Due to the pressing force of the roller 1, the product shape is also deteriorated.

従って、熱間仕上圧延により得た爪曲げ前の断面形状を有する鋼矢板に対して、外側の竪ローラ１を爪曲げに作用させ、内側の竪ローラ２でその反力を受けると共に、上下一対の水平ローラ３で継手支持部６の上下方向位置を保持するようにして、左右の継手の爪曲げを少なくとも１回、施すことにより、爪曲げを精度良く行うことができ、しかも形状を良好に保つことができ、寸法形状精度の良い製品を製造することができる。 Therefore, the steel sheet pile having a cross-sectional shape before claw bending obtained by hot finish rolling is caused to cause the outer scissor roller 1 to act on claw bending and receive the reaction force by the inner scissor roller 2, and a pair of upper and lower The horizontal roller 3 can hold the joint support portion 6 in the vertical direction so that the right and left joints can be bent at least once, so that the claws can be bent with high accuracy and the shape can be improved. It is possible to maintain a product with good dimensional shape accuracy.

なお、左右非対称形状の継手５Ａ、５Ｂの爪曲げを行うため、鋼矢板幅方向両側位置に配置する外側の竪ローラ１の凹面形状は、図２に示す如く、断面で見て異なる形状に形成されている。   In addition, in order to perform the claw bending of the left and right asymmetrical joints 5A and 5B, the concave shape of the outer scissors roller 1 arranged at both side positions in the steel sheet pile width direction is formed in different shapes as seen in cross section as shown in FIG. Has been.

図２を用い、上述した製造方法に用いて好適な実施の形態に係るハット形鋼矢板の爪曲げ装置１０について説明する。但し、外側の竪ローラ１、内側の竪ローラ２および上下一対の水平ローラ３に関して、重複する説明は省略する。   A hat-shaped steel sheet pile claw bending device 10 according to a preferred embodiment used in the manufacturing method described above will be described with reference to FIG. However, the overlapping description of the outer side roller 1, the inner side roller 2, and the pair of upper and lower horizontal rollers 3 is omitted.

実施の形態に係る爪曲げ装置１０においては、外側の竪ローラ１、内側の竪ローラ２および上下一対の水平ローラ３の４個で構成するローラ群は、鋼矢板幅中央を境として左右対称に、配置されている。その際、各ローラは、軸芯１Ａ、２Ａ、３Ａが鋼矢板長手方向と直交する同一面内に位置するように軸受けを介して回転自在に架台１１に取り付けられている。このように配置する理由は、外側の竪ローラ１、内側の竪ローラ２および上下一対の水平ローラ３の４個で構成するローラ群を上記のように配置しない場合、安定して所定の爪曲げ量を確保できないからである。   In the claw bending device 10 according to the embodiment, the roller group constituted by the outer side roller 1, the inner side roller 2, and the pair of upper and lower horizontal rollers 3 is symmetric with respect to the center of the sheet pile width. Have been placed. In that case, each roller is rotatably attached to the gantry 11 via a bearing so that the shaft cores 1A, 2A, and 3A are located in the same plane orthogonal to the steel sheet pile longitudinal direction. The reason for this arrangement is that when a group of four rollers, that is, the outer side roller 1, the inner side roller 2, and the pair of upper and lower horizontal rollers 3, is not arranged as described above, the predetermined nail bending is stably performed. This is because the amount cannot be secured.

また、継手支持部６を挟んで上下に配置する上下一対の水平ローラ３は、所定の保持力で継手支持部６を保持できる構造とするのが好ましい。このような構造とすることにより、継手支持部６の厚み変動に対応して所定の保持力で継手支持部６を保持でき、爪曲げ精度を上げつつ、装置内で鋼矢板が座屈して詰まってしまうことを防止することができる。なお、上水平ローラ３は、上水平ローラ３を回転自在に支持する軸受けと、架台１１に取り付けた垂下部材との間にコイルばね１３を介在させ、所定の保持力で継手支持部６を下方に押し付ける構造とした。Ｇは、軸受けと垂下部材との間の隙間を示す。下水平ローラ３は、製造するハット形鋼矢板の継手支持部６の位置に合わせて軸受けを介して架台１１に取り付けた。   Moreover, it is preferable that the pair of upper and lower horizontal rollers 3 arranged above and below the joint support portion 6 can hold the joint support portion 6 with a predetermined holding force. By adopting such a structure, the joint support portion 6 can be held with a predetermined holding force corresponding to the thickness variation of the joint support portion 6, and the steel sheet pile is buckled and clogged in the apparatus while increasing the claw bending accuracy. Can be prevented. The upper horizontal roller 3 has a coil spring 13 interposed between a bearing that rotatably supports the upper horizontal roller 3 and a hanging member attached to the gantry 11, and the joint support portion 6 is moved downward by a predetermined holding force. The structure is pressed against G shows the clearance gap between a bearing and a drooping member. The lower horizontal roller 3 was attached to the gantry 11 via a bearing in accordance with the position of the joint support portion 6 of the hat-shaped steel sheet pile to be manufactured.

また、実施の形態に係る爪曲げ装置１０は、熱間仕上圧延機出側直近に配設されているのが好ましい。この理由は、爪曲げ装置１０の各ローラを、低速度で進入してくる鋼矢板により回転させるようにすると、停止していた各ローラが回転を始める際に、各ローラと低速度で進入してくる鋼矢板との間に速度差が発生せず、スリップを防止することができるからである。なお、爪曲げ装置１０を熱間仕上圧延機出側直近に配設した場合には、各ロールに駆動モータや動力伝達機構を設けずとも、熱間仕上圧延機の動力によって付与された鋼矢板の慣性力と鋼矢板を搬送するテーブルローラからの摩擦力を利用して、十分爪曲げを行うことができる利点がある。   Moreover, it is preferable that the nail | bending bending apparatus 10 which concerns on embodiment is arrange | positioned in the hot finish rolling mill immediate vicinity. The reason for this is that if each roller of the claw bending device 10 is rotated by a steel sheet pile that enters at a low speed, when the stopped rollers start rotating, they enter the rollers at a low speed. This is because there is no speed difference between the steel sheet piles and the slip can be prevented. In addition, when the claw bending device 10 is disposed in the immediate vicinity of the hot finish rolling mill exit side, a steel sheet pile provided by the power of the hot finish rolling mill without providing a drive motor or a power transmission mechanism for each roll. There is an advantage that the claws can be sufficiently bent using the inertia force and the frictional force from the table roller that conveys the steel sheet pile.

また、実施の形態に係る爪曲げ装置１０には、さらにウエブ位置を保持するウエブ押さえローラ８がウエブの上方に軸受けを介して回転自在に設けられていることが好ましい。この理由は、フランジ４と鋼矢板幅方向とのなす角θが小さい製品を製造する場合、爪曲げを行う際に、ウエブが上方に位置ずれしやすくなるが、ウエブ押さえローラ８を設置したことにより防止できるようになるからである。符号９は、圧延材先端を誘導するためのウエブガイドで、ウエブガイド９は架台１１にウエブ先端部がローラ８に接触するよう固定されている。   Further, in the claw bending device 10 according to the embodiment, it is preferable that a web pressing roller 8 for holding the web position is provided rotatably above the web via a bearing. The reason for this is that when manufacturing a product with a small angle θ between the flange 4 and the steel sheet pile width direction, the web tends to be displaced upward when the claw is bent, but the web pressing roller 8 is installed. This is because it can be prevented. Reference numeral 9 denotes a web guide for guiding the leading end of the rolled material, and the web guide 9 is fixed to the gantry 11 so that the leading end of the web contacts the roller 8.

ところで、外側の竪ローラ１、内側の竪ローラ２および上下一対の水平ローラ３は、ベアリングを内装しており、ベアリングにロール軸を差し込む構造とされているのが交換が容易であり好ましい。図２ではローラに内装されたベアリングの図は省略した。   Incidentally, it is preferable that the outer side roller 1, the inner side roller 2 and the pair of upper and lower horizontal rollers 3 are provided with bearings so that the roll shaft is inserted into the bearings because they can be easily exchanged. In FIG. 2, the illustration of the bearing built in the roller is omitted.

外側の竪ローラ１は、図示しない左右方向に移動可能なサイドガイドに軸受けを介して回転自在に固定され、サイドガイドの位置を所定の爪曲げ量を付与できる鋼矢板幅方向位置に設定することにより爪曲げ量を調整可能とされている。内側の竪ローラ２は、製造すべきハット形鋼矢板のフランジ４と鋼矢板幅方向とのなす角θに合致させて形成された斜面をハット形鋼矢板のフランジ内面と接触するように、ロール軸固定台１２を介して架台１１に固定されている。   The outer side roller 1 is rotatably fixed to a side guide (not shown) that can move in the left-right direction via a bearing, and the position of the side guide is set to a steel sheet pile width direction position that can give a predetermined claw bending amount. This makes it possible to adjust the amount of claw bending. The inner side roller 2 is rolled so that a slope formed in accordance with an angle θ formed by the flange 4 of the hat-shaped steel sheet pile to be manufactured and the width direction of the steel sheet pile contacts the inner surface of the flange of the hat-shaped steel sheet pile. It is fixed to the gantry 11 via the shaft fixing base 12.

上述した実施の形態に係る爪曲げ装置１０によれば、熱間仕上圧延により得た左右非対称形状の継手を有する爪曲げ前のハット形鋼矢板に対して、外側の竪ローラ１を爪曲げに作用させ、内側の竪ローラ２でその反力を受けると共に、上下一対の水平ローラ３で継手支持部６の上下方向位置を保持するようにして左右の継手の爪曲げを少なくとも１回、施すことで所定の爪曲げ量を付与でき、寸法形状精度の良い、左右非対称形状の継手５Ａ、５Ｂを有するハット形鋼矢板を製造することができる。 According to the claw bending device 10 according to the above-described embodiment, the outer scissors roller 1 is subjected to claw bending with respect to the hat-shaped steel sheet pile before claw bending having a left-right asymmetrical joint obtained by hot finish rolling. The left and right joints are subjected to claw bending at least once so that the inner heel roller 2 receives the reaction force and the pair of upper and lower horizontal rollers 3 holds the joint support portion 6 in the vertical direction. Thus, a hat-shaped steel sheet pile having right and left asymmetrical joints 5A and 5B having a good dimensional shape accuracy can be produced.

扁平なスラブ（厚み：２２０ｍｍ、幅：１０００ｍｍ）を素材として用い、粗圧延、中間圧延および仕上圧延を施して有効幅が９００ｍｍの左右非対称形状の継手を有するハット形鋼矢板を製造した。
〔製造方法〕
スラブを素材とし、粗圧延機を用い、ボックス孔型で幅調整した後孔型Ｋ８、Ｋ７により、９〜１１パスの粗圧延を行い、引き続き、タンデム配置した第１中間圧延機と第２中間圧延機を用い、第１パスで孔型Ｋ５（空パス）、孔型Ｋ６、第２パスで孔型Ｋ６、孔型Ｋ５、第３パスで孔型Ｋ４、孔型Ｋ３により中間圧延を行った。 Using a flat slab (thickness: 220 mm, width: 1000 mm) as a raw material, rough rolling, intermediate rolling and finish rolling were performed to produce a hat-shaped steel sheet pile having a left-right asymmetrical joint with an effective width of 900 mm.
〔Production method〕
The slab is used as a raw material, the width is adjusted with a box hole mold using a rough rolling mill, and then 9 to 11 passes of rough rolling are performed by the hole molds K8 and K7. Using a rolling mill, intermediate rolling was performed with hole type K5 (empty pass), hole type K6 in the first pass, hole type K6, hole type K5 in the second pass, hole type K4 in the third pass, and hole type K3. .

その後、仕上圧延機を用い、第１パスで孔型Ｋ２により圧下した後、爪曲げ装置で爪曲げを実施し、第２パスでは孔型Ｋ１を仕上げパスまたは空パスとし、第３パスは形状制御パスとした。図３〜５に使用した孔型形状を示した。
〔使用圧延機〕
粗圧延機：水平ロール２１、２２の胴長２８００ｍｍ、孔型数３、孔型形状：図３（Ａ）、（Ｂ）参照（但し、図３（Ｂ）はスラブ幅圧下後の最初の厚み圧下の状態）
第１中間圧延機：水平ロール３１、３２の胴長２５００ｍｍ、孔型数２、孔型形状：図４参照
第２中間圧延機：水平ロール３３、３４の胴長２５００ｍｍ、孔型数２、孔型形状：図４参照
仕上圧延機：水平ロール４１、４２の胴長２５００ｍｍ、孔型数２、孔型形状：図５参照
発明例と従来例の圧下スケジュール（各孔型通過後のウエブ中央厚）を表１に示す。但し、従来例は、発明例と同様な素材を用い、水平ロールによる熱間圧延のみにより、発明例と同様な規格の製品を製造していたときの圧下スケジュールである。 After that, using a finishing mill, the first pass is squeezed by the hole mold K2, and the nail bending apparatus is used to perform the nail bending. In the second pass, the hole mold K1 is used as a finishing pass or an empty pass, and the third pass is shaped. Control path. The hole shape used in FIGS.
[Used rolling mill]
Rough rolling mill: Horizontal rolls 21 and 22 with a barrel length of 2800 mm, number of holes 3 and hole shape: see FIGS. 3A and 3B (however, FIG. 3B is the initial thickness after slab width reduction) Under pressure)
First intermediate rolling mill: horizontal rolls 31 and 32 with a barrel length of 2500 mm, number of holes 2 and hole shape: see FIG. 4 Second intermediate rolling mill: horizontal rolls 33 and 34 with a body length of 2500 mm, number of holes 2 and holes Die shape: Refer to FIG. 4 Finishing mill: Horizontal rolls 41, 42 with a barrel length of 2500 mm, number of hole types, hole shape: Refer to FIG. 5 Inventive example and conventional example rolling schedule (web center thickness after passing through each hole type) ) Is shown in Table 1. However, the conventional example is a reduction schedule when a product having the same standard as that of the example of the invention is manufactured only by hot rolling with a horizontal roll using the same material as the example of the invention.

Figure 0004830255
Figure 0004830255

従来、継手の爪曲げを行うのに、水平ロールにより実施していたので、仕上圧延において孔型Ｋ２および孔型Ｋ１の２パスを要していたが、発明例によれば、仕上圧延機の出側に配置した爪曲げ装置１０により爪曲げを実施しているので、仕上圧延において孔型Ｋ２による継手の爪曲げを行う必要がなく、孔型Ｋ２のパスを断面積減少のための圧下パスとすることができた。この結果、発明例では、粗圧延終了以後における断面積減少のための圧下パスを１パス増やすことができ、粗圧延終了以後における平均圧下率を１２．８％に低減することができ、圧延に要する負荷およびロールの必要強度を小さくする事ができた。   Conventionally, since the claw bending of the joint has been performed by a horizontal roll, two passes of the hole mold K2 and the hole mold K1 are required in the finish rolling. According to the invention example, Since the claw bending is performed by the claw bending device 10 arranged on the outlet side, it is not necessary to perform claw bending of the joint by the hole shape K2 in the finish rolling, and the pass of the hole shape K2 is a reduction pass for reducing the cross-sectional area. And was able to. As a result, in the invention example, the reduction pass for reducing the cross-sectional area after the end of the rough rolling can be increased by 1 pass, the average reduction rate after the end of the rough rolling can be reduced to 12.8%, The required load and the required strength of the roll could be reduced.

一方、従来例では、粗圧延終了以後における中間圧延での平均圧下率は１５．４％で、圧下パスでの圧延荷重が平均１０００トンであったが、発明例の場合は９１０トンに軽減された。中間圧延においての圧延負荷軽減は寸法形状が悪化するのを防ぐ効果もあった。   On the other hand, in the conventional example, the average rolling reduction in the intermediate rolling after the end of the rough rolling was 15.4% and the rolling load in the rolling pass was an average of 1000 tons, but in the case of the invention example, it was reduced to 910 tons. It was. Reducing the rolling load in intermediate rolling also has the effect of preventing deterioration of the dimensions and shape.

また、発明例によって得た製品の爪精度を表２に示した。比較として、左右対称形状の継手を有する鋼矢板を従来法の水平ロールによる爪曲げで製造したものの爪精度を示す。ここで、爪精度とは、爪先端と対面する壁との間隔を測定し、その値と管理目標値との偏差で定義した。   Table 2 shows the nail accuracy of the products obtained by the inventive examples. For comparison, the claw accuracy of a steel sheet pile having a bilaterally symmetric joint manufactured by claw bending with a conventional horizontal roll is shown. Here, the nail accuracy was defined by measuring the distance between the nail tip and the facing wall and the deviation between the measured value and the management target value.

Figure 0004830255
Figure 0004830255

表２に示す結果から、本発明を適用することにより、左右対称形状の継手を有する鋼矢板と比較して同等の精度で爪曲げを行うことができ、左右非対称形状の継手を有するハット形鋼矢板製品の爪精度および製品形状を良好にできることがわかる。   From the results shown in Table 2, by applying the present invention, it is possible to perform claw bending with the same accuracy as a steel sheet pile having a symmetrically shaped joint, and a hat-shaped steel having a laterally asymmetrically shaped joint. It can be seen that the nail accuracy and product shape of the sheet pile product can be improved.

本発明に係るハット形鋼矢板の製造方法を説明するための要部断面図である。It is principal part sectional drawing for demonstrating the manufacturing method of the hat-shaped steel sheet pile concerning this invention. 本発明の実施の形態に係る爪曲げ装置１０の全体構成を示す正面図である。It is a front view showing the whole nail bending device 10 composition concerning an embodiment of the invention. 実施例における粗圧延に用いた孔型形状を示す説明図である。It is explanatory drawing which shows the hole shape used for the rough rolling in an Example. 実施例における中圧延に用いた孔型形状を示す説明図である。It is explanatory drawing which shows the hole shape used for the intermediate rolling in an Example. 実施例における仕上圧延に用いた孔型形状と図２の爪曲げ装置１０の配置位置を示す説明図である。It is explanatory drawing which shows the hole shape used for the finish rolling in an Example, and the arrangement position of the nail | claw bending apparatus 10 of FIG. 水平ロールによる爪曲げ状態を示す説明図である。It is explanatory drawing which shows the nail | claw bending state by a horizontal roll. 左右非対称形状の継手を有するハット形鋼矢板製品の一例を示す断面図である。It is sectional drawing which shows an example of the hat-shaped steel sheet pile product which has a joint of a left-right asymmetric shape.

符号の説明Explanation of symbols

１、２ 竪ローラ
３ 水平ローラ
４ フランジ
５Ａ、５Ｂ 継手
６ 継手支持部
７Ａ、７Ｂ 爪
８ ウエブ押さえローラ
９ ウエブ受け具
１０ 爪曲げ装置
１１ 架台
１２ ロール軸固定台
１３ コイルばね
Ｇ 隙間
θ フランジ４の傾き角
１Ａ、２Ａ、３Ａ、８Ａ 各ローラの軸芯
２１、２２、３１、３２、３３、３４、４１、４２ 水平ロール
１００ ハット形鋼矢板製品
１０１ ウエブ
１０４ フランジ
１０５Ａ、１０５Ｂ 継手
１０６ 継手支持部
１０７Ａ、１０７Ｂ 爪
Ｂ０ 有効幅
ＢＷ ウエブ幅
Ｈ０ 全高さ
ｔＷ ウエブ厚
1, 2 竪 Roller 3 Horizontal roller 4 Flange 5A, 5B Joint 6 Joint support 7A, 7B Claw 8 Web holding roller 9 Web holder 10 Claw bending device 11 Base 12 Roll shaft fixing base 13 Coil spring G Clearance θ Flange 4 Inclination angle 1A, 2A, 3A, 8A Shaft core 21, 22, 31, 32, 33, 34, 41, 42 of each roller Horizontal roll 100 Hat-shaped steel sheet pile product 101 Web 104 Flange 105A, 105B Joint 106 Joint support 107A , 107B Claw B 0 Effective width B W web width H 0 Total height t W web thickness

Claims (2)

左右非対称形状の継手を有するハット形鋼矢板の製造方法において、熱間仕上圧延により得た左右非対称形状の継手を有する爪曲げ前のハット形鋼矢板に対して、外側の竪ローラに設けた凹面を爪曲げに作用させ、内側の竪ローラでその反力を受けると共に、上下一対の水平ローラで継手支持部の上下方向位置を保持する爪曲げ装置を仕上圧延機の出側に配置して、該爪曲げ装置により、前記上下一対の水平ロールを介して前記継手支持部を所定の保持力で保持して座屈を防止しながら、前記外側の竪ロールの凹面を前記継手に押圧して左右の継手の爪曲げを少なくとも１回、施すことを特徴とする左右非対称形状の継手を有するハット形鋼矢板の製造方法。 In the manufacturing method of a hat-shaped steel sheet pile having a left-right asymmetric shape joint, a concave surface provided on the outer scissors roller with respect to the hat-shaped steel sheet pile before claw bending having a right-left asymmetric shape joint obtained by hot finish rolling The nail bending device that acts on the nail bending and receives the reaction force by the inner heel roller and holds the vertical position of the joint support portion by a pair of upper and lower horizontal rollers is arranged on the exit side of the finishing mill, The claw bending device presses the concave surface of the outer scissors roll against the joint while holding the joint support portion with a predetermined holding force through the pair of upper and lower horizontal rolls to prevent buckling. A method for producing a hat-shaped steel sheet pile having a left-right asymmetrical joint, wherein the joint is bent at least once. 仕上圧延機の出側に配置され、左右非対称形状の継手を有するハット形鋼矢板を製造するための爪曲げ装置であって、前記継手の爪曲げに作用する凹面を設けた外側の竪ローラと、爪曲げ反力を受ける内側の竪ローラと、継手支持部の上下方向位置を所定の保持力で保持して座屈を防止する上下一対の水平ローラと、で４個のローラ群を構成し、該ローラ群を鋼矢板幅方向の左右にそれぞれ少なくとも１組、鋼矢板長手方向と直交する同一平面内に各ローラの軸芯を位置させて配置してなることを特徴とする左右非対称形状の継手を有するハット形鋼矢板の爪曲げ装置。 A claw bending device for producing a hat-shaped steel sheet pile having a left-right asymmetrical joint disposed on the exit side of a finish rolling mill, comprising an outer scissors roller provided with a concave surface acting on the claw bending of the joint ; constitutes an inner vertical roller receiving the nail bending reaction force, the pair of upper and lower horizontal rollers to prevent buckling holds the vertical position of the joint support portion at a predetermined holding force, in the four rollers The left and right asymmetric shapes are characterized in that the roller groups are arranged at least one set on each of the left and right sides in the width direction of the steel sheet pile, and the axis of each roller is positioned in the same plane perpendicular to the longitudinal direction of the steel sheet pile. A claw bending device for a hat-shaped steel sheet pile having a joint.
JP2003385659A 2003-11-14 2003-11-14 Method for manufacturing hat-shaped steel sheet pile having asymmetrical joint and claw bending apparatus used therefor Expired - Lifetime JP4830255B2 (en)

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