JP2004169268A

JP2004169268A - Holding device for spiral steel wire

Info

Publication number: JP2004169268A
Application number: JP2002332489A
Authority: JP
Inventors: Kaki Jinno; 嘉希神野; Yukio Kitago; 征雄北後; Terukazu Shibata; 輝和柴田
Original assignee: Okumura Corp; West Japan Railway Co; JR West Japan Consultants Co
Current assignee: Okumura Corp; West Japan Railway Co; JR West Japan Consultants Co
Priority date: 2002-11-15
Filing date: 2002-11-15
Publication date: 2004-06-17
Anticipated expiration: 2022-11-15
Also published as: JP3993506B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holding device for a spiral steel wire, adapted to hold a spiral steel wire in the periphery of an existing post and easily wind the same, and light, simple and easily carried and assembled. <P>SOLUTION: This holding device for the spiral steel wire is formed by working shape steel 5 into two-split ring like parts to be connected by a bolt. The holding device includes: a base material 1 provided with a plurality of ball bearings 9 mounted on the top face; a revolving member 2 formed by similarly working a steel material having a semi-circular section into two-split ring like parts and supported on the ball bearings 9 of the base material to freely revolve; a ring-like receiving member 3 erected on the revolving member 2 to hold a steel-made stranded wire previously worked into a bundle; and a plurality of suspending arms 4 projected on the outer periphery of the base material 1. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、既設柱の外周に補強のために巻き付けられる螺旋状の鋼線を保持する螺旋状鋼線の保持装置に関する。
【０００２】
【従来の技術】
従来、矩形断面の既設柱の外周に補強のために螺旋状の鋼線を巻き付ける方法として、本願出願人に帰属する特許に記載の手法がある（例えば、特許文献１参照。）。この方法は、図７（Ａ），（Ｂ）に示すように、既設柱５１の断面よりも少し大きい螺旋状の矩形の束に加工した螺旋状鋼線３１を、既設柱５１の基部外周に束面（ループ面）が外面に対向するように鉛直に立て、直角に曲げた先端を既設柱５１の柱面に垂直に設けた穴（図示せず）に差し込んで固定し、束面を垂直に保持したまま、図７（Ｂ）の矢印Ｘで示す束がほどける方向に回転させつつ、既設柱５１の周囲に矢印Ｙで示す方向へ巡らせて、１ループずつ既設柱の周りに巻き付けるものである。
【０００３】
総てのループが図示の如く既設柱５１の下端外周に水平に重なり合って巻き付けが終わると、螺旋状鋼線３１を、既設柱５１の四隅に間隔を隔てて垂設した内接する添え筋（図示せず）に沿って持ち上げつつ、柱の高さ方向に所定ピッチになるように結束線で添え筋に固定し、既設柱５１の全長に亘って配設する。最後に、既設柱５１および螺旋状鋼線３１を覆うように所定厚さでモルタルを吹き付けて、既設柱５１の補強を終了する。
この螺旋状鋼線の巻き付け方法は、螺旋状鋼線３１を束面内でループを開く方向に大きく変形させずに、鋼線の束を既設柱５１の周りに巡らせながら鋼線をその軸の周りに少し捩じるだけの弾性変形範囲で巻き付けができるので、油圧シリンダ等の大掛かりな機械を要さずに人手で容易に巻き付けが行なえ、施工の手間と費用を大幅に削減できるという利点を有し、これによって、既設柱５１の剪断耐力と靭性を向上させ、地震による繰り返し荷重に対して既設柱５１を強固に補強することができる。
【０００４】
【特許文献１】
特許第３１９０５５６号
【０００５】
【発明が解決しようとする課題】
最近、本願出願人は、未公開であるが、既設柱の新たな補強方法および補強構造を提案した。この補強方法は、図５，図６に示すように、まず、正方形断面の既設柱５１の周囲に、両端が切り取られた三日月型断面をもつ平行四辺形状のコンクリートブロック２１をセメントペースト２２によって周方向に順次張り付け、次いで貧配合モルタル２３を介して既に張り付けられたコンクリートブロック上に積み重ねて、既設柱５１の上端まで全周を覆う。
次いで、各コンクリートブロック２１の表面に斜めに複数本平行に設けられ、全体で連なった１本の螺旋をなす溝２４に、既設柱断面の対角線長さの略８０％の直径をもつ螺旋状の円に予め加工した鋼製の撚り線３１を、図７（Ａ），（Ｂ）で述べたと同じ手法で巻き付ける。但し、この場合は、撚り線３１のループを持ち上げつつ柱四隅の添え筋に結束線で固定するのでなく、ループを上方へ開きぎみに引き上げつつ溝２４に嵌め込む。こうして、柱全長に亘って巻き付けた撚り線の弾性変形に伴う応力で、コンクリートブロック２１を全周から既設柱５１に密着させて一体化し、地震荷重に対する既設柱５１の剪断耐力を向上させるのである。なお、撚り線の終端と次の撚り線の始端は、外周にグリップを取り付けて互いに接続する。
【０００６】
ところが、上記既設柱の新たな補強方法は、撚り線３１の束の直径が、既設柱５１を一周する溝２４が呈する円の直径よりも小さいため、図７の従来例で述べたように撚り線３１の束を一旦既設柱５１の下端外周に総て巻き付けてから引き上げることができず、撚り線３１の束を図７（Ｂ）の矢印Ｘ方向へ回転させつつ、既設柱５１の周囲に矢印Ｙ方向へ巡らせ、さらに持ち上げる必要が生じ、撚り線の束が地面から離れると、撚り線の矢印Ｘ方向への回転と矢印Ｙ方向への巡回が難しくなくなる。撚り線３１の一束は、全長５０ｍ，重量５０〜６０ｋｇにもなり、作業者は、既設柱５１の周囲に設けられた張り出し足場上を回りながら上下して、撚り線３１を既設柱５１に巻き付けなければならず、安全上問題があるとともに、施工能率が低下するという問題がある。
【０００７】
そこで、本発明の目的は、撚り線の束などの螺旋状鋼線を既設柱の周りに保持して巻き付けを容易にできる軽量で簡素かつ運搬，組立てが容易な螺旋状鋼線の保持装置を提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、請求項１の螺旋状鋼線の保持装置は、分割可能なリング状の基材と、分割可能で上記基材に相対回転可能に載置されたリング状の旋回部材と、螺旋状の束に形成された鋼線を保持すべく上記旋回部材に設けられた受け部材を備えたことを特徴とする。
【０００９】
上記螺旋状鋼線の保持装置によれば、分割された基材を、既設柱を取り囲むようにリング状に連結して地面に置き、分割された旋回部材を、既設柱を取り囲むようにリング状に連結して、地面に置かれたリング状の基材に相対回転可能に載置する。そして、予め螺旋状の束に加工されて例えば回転筒に巻き付けられた鋼線の先端を上記リング状の旋回部材に固定した後、旋回部材を旋回させて鋼線をこの旋回部材の受け部材に巻き取って、螺旋状鋼線の束の総てを受け部材に保持する。次に、この螺旋状鋼線の先端を既設柱の下端に固定した後、鋼線を既設柱の外周の例えば螺旋溝に嵌め込むなどして螺旋状に上方へ向かって巻き付けていく。巻き付けに伴って、リング状の基材に載置された旋回部材は、鋼線を送り出しながら巻き付け方向へ旋回して、人手による巻き付けを容易にする。
【００１０】
ここで、既設柱を一周する上記螺旋溝が呈する円の直径よりも鋼線の束の加工直径を小さくして、弾性的に伸びた状態で旋回部材の受け部材に保持すれば、巻き付けられる鋼線は螺旋溝に密着して脱落しにくくなる。既設柱への巻き付けが所定高さに達すると、巻き付けを中断して、リング状の基材を旋回部材と一緒に既設柱の周囲に設けられた足場の上方へ移し替え、再び巻き付けを開始し、これを繰り返して既設柱の全長に亘る巻き付けを終了する。この場合、作業者は、従来のように重い鋼線の束を手で回転させながら足場上を回りつつ上下して巡回させる必要がなくなり、リング状の基材を足場上方へ設置し直すだけで、巻き付けを行なうことができ、作業の安全性および施工の能率を大幅に向上させることができる。
【００１１】
請求項２の螺旋状鋼線の保持装置は、上記基材の外周に吊り下げ用のアームを突設したことを特徴とする。
【００１２】
上記螺旋状鋼線の保持装置によれば、基材の外周に突設された吊り下げ用のアームに、足場上端などに設けられた例えば小型のウィンチやチェーンブロックのワイヤやチェーンを繋げば、巻き付けに従ってウィンチ等でリング状の基材を上方へ容易かつより安全に移動させることができ、作業の安全性および施工の能率を一層向上させることができる。
【００１３】
【発明の実施の形態】
以下、本発明を図示の実施の形態により詳細に説明する。図１は、本発明による螺旋状鋼線の保持装置の一実施形態を示す平面図であり、図２，図３，図４は、夫々図１のＩＩ線，ＩＩＩ線，ＩＶ線に沿う断面図である。
この螺旋状鋼線の保持装置は、図１のＩＩ−ＩＩ線の位置で２分割できるリング状の基材１と、同様に２分割でき、基材１に相対回転自在に載置されるリング状の旋回部材２と、この旋回部材２の中心軸上に半円弧をなして立設され、螺旋状の束に予め加工された鋼線としての撚り線３１を図２〜図４に示すように外周に巻き付けて保持する鉛直受け部材３ａと、基材１の外周を４等分する各箇所に図１に示すように突設された吊り下げ用のアーム４を備えている。
【００１４】
上記基材１は、図２に示すようなコ字状断面をもつ形鋼５を、ウェブを内側にして既設柱５１の直径よりも少し大きい直径になるように図１に示すような半円形のセグメント５ａ，５ｂに曲げ加工し、両セグメントの両端に、コ字状断面を仕切るように連結ボルト挿通穴６ａ，６ｂをもつ連結用リブ６を取り付けてなる。上記アーム４は、図４に示すように、基材１のコ字状断面をもつ形鋼５に基部を隅肉溶接して水平に取り付けられ、図示しない小型のウインチから垂下するワイヤ８の先端が結び付けられる挿通穴７を先端部に有する。また、基材１の形鋼５のフランジ上面には、円周方向に等間隔の８箇所に、旋回部材２を回転自在に支承するボールベアリング９を図３の如く取り付けている。
【００１５】
一方、上記旋回部材２は、鋼管を上記基材１と同じ直径をもつ半円に曲げ加工し、管断面を２等分する水平面で上下に切断して、図１のＩＩ−ＩＩ面で連結される２つのセグメント１０ａ，１０ｂとし、このセグメントと略同じ半径の半円弧にロール加工した平鋼をセグメント１０ａ，１０ｂの頂部に沿って溶接して上記鉛直受け部材３ａとし、両セグメントの両端に、図２の如く３つの連結ボルト挿通穴１１ａをもつ連結用リブ１１を鉛直受け部材３ａの内側面に沿って取り付けている。また、各旋回部材２の鉛直受け部材３ａの外側面には、図１に示す位置に夫々８本の水平受け部材３ｂを図３に示すように突設し、各水平受け部材の先端に抜け防止用の鉛直バー３ｃを設けるとともに、鉛直受け部材３ａの頂部に、図４に示すように抜け防止用の水平バー３ｄを設けている。
上記鉛直受け部材３ａ，水平受け部材３ｂ，鉛直バー３ｃおよび水平バー３ｄで、螺旋状の束に予め加工された撚り線３１を保持する受け部材３が構成される。
【００１６】
上記構成の螺旋状鋼線の保持装置を次のように用いて、螺旋状の束に予め加工された撚り線３１を既設柱５１の周りに巻き付ける。
まず、定尺（例えば５０ｍ）の鋼製の撚り線を、図５，図６に示す既設柱５１の螺旋溝２４の直径の略８０％の直径に曲げ加工して図示しない回転円筒の外周に巻き付けて蓄えておく。次に、既設柱５１の下端を囲むように半円形のセグメント５ａ，５ｂを地面に配置し、対向する端部の１対の連結用リブ６をボルト，ナットで連結してリング状の基材１を組み立て、続いて半円形のセグメント１０ａ，１０ｂを連結用リブ１１を介して同様に連結してリング状の旋回部材２を組み立て、この旋回部材２を基材１の８つのボールベアリング９に載せて旋回自在に支承する。
そして、回転円筒に蓄えた撚り線の終端を引き出して、旋回部材２の水平受け部材３ｂの基端に固定した後、旋回部材２を回して撚り線３１を回転円筒から鉛直受け部材３ａの外周に図２〜４に示すように総て巻き取る。螺旋溝２４の直径の８０％の直径に加工されていた撚り線３１は、大径の鉛直受け部材３ａに巻き取られるので、引張り力により弾性変形して伸びた状態で保持される。
【００１７】
次に、受け部材３に巻き取られた撚り線３１の終端を引き出し、直角に曲げて既設柱５１の基端の柱面に垂直に明けた穴に差し込んだ後、後続の撚り線３１を引き出しながら既設柱の螺旋溝２４に上方へ向かって嵌め込んでいく。これに伴って、地上の基材１に支承された旋回部材２は、嵌め込み方向へ旋回しつつ撚り線３１を円滑に送り出す。巻き付けられる撚り線３１は、螺旋溝２４の直径の８０％の小径に曲げ加工されているので、弾性伸びが少し緩和されつつ螺旋溝２４に密着し、三日月型のコンクリートブロック２１を正方形断面の既設柱５１に向けて外周から押し付けて、両者を強固に一体化するとともに、螺旋溝２４から脱落することがない。
【００１８】
既設柱５１への巻き付けが、所定の高さまで達すると、巻き付けを中断して、基材１の外周から突出する４つのアーム４の挿通穴７に図４の如く結び付けたワイヤ８を、図示しない周囲足場の頂部に設けた小型ウインチで巻き上げて、基材１を旋回部材２と一緒に巻き付け位置まで引き上げる。その後、再び撚り線３１の巻き付けを開始し、撚り線３１の巻き付けと基材１の引き上げを繰り返して、既設柱５１の全長に亘る撚り線３１の巻き付けを終了する。
【００１９】
このように、上記螺旋状鋼線の保持装置によれば、作業者は、従来のように重い撚り線の束を手で回転させながら足場上を回りつつ上下して巡回させる必要がなくなり、リング状の基材１を小型のウインチを用いて容易に上方へ引き上げ、旋回部材２が回転するだけで、既設柱の全長に撚り線を巻き付けることができ、巻き付け作業の安全性および能率を大幅に向上させることができる。
また、上記保持装置は、２分割のリング状の基材１のボールベアリング９に、受け部材３を備えた２分割のリング状の旋回部材２を支承した簡素な構造であるので、軽量で運搬，組み立ておよび上方への引き上げを容易に行なうことができる。
【００２０】
上記実施形態では、基材１上のボールベアリング９で旋回部材２を支承したが、ローラ等で旋回部材を支承してもよい。また、断面コ字状の形鋼５に代えて、Ｉ型鋼や角パイプを基材１に用い、半割の鋼管に代えて、コ字状断面の形鋼を旋回部材２に用いることもできる。
上記実施形態では、水平受け部材３ｂの先端に鉛直バー３ｃを設け、鉛直受け部材３ａの頂部に水平バー３ｄを設けたが、受け部材３の鉛直バー３ｃと水平バー３ｄは、省略することもできる。
さらに、上記実施形態では、鋼線として鋼製の撚り線を用いたが、細径の棒鋼を用いることも可能である。
【００２１】
また、本発明の吊り下げ用のアームを突設したリング状の基材の寸法と強度を、作業者が乗れる程度にして、複数のアームに渡ってリング状の足場を取り付け、大型のクレーンや巻上機で、基材を昇降させれば、装置は大掛かりになるが、既設柱の周りに足場を設ける必要がなくなり、巻き付け作業の安全性および能率を更に向上できるという利点がある。
【００２２】
【発明の効果】
以上の説明で明らかなように、請求項１の螺旋状鋼線の保持装置は、分割可能なリング状の基材と、分割可能で上記基材に相対回転可能に載置されたリング状の旋回部材と、螺旋状の束に形成された鋼線を保持すべく上記旋回部材に設けられた受け部材を備えているので、作業者が、重い鋼線の束を手で回転させながら足場上を回りつつ上下して巡回させる必要がなくなり、基材を適宜上方の足場へ移設し、旋回部材を回わすだけで、既設柱の全長に鋼線を巻き付けることができ、巻き付け作業の安全性および能率を大幅に向上させることができるうえ、保持装置が簡素な構造であるので、軽量で運搬，組み立ておよび上方への移設を容易に行なうことができる。
【００２３】
請求項２の螺旋状鋼線の保持装置は、基材の外周に吊り下げ用のアームを突設しているので、基材の上方足場への移設を行なうことなくウインチ等によってより容易かつより安全に基材を引き上げることができ、巻き付け作業の安全性および能率を一層向上させることができる。
【図面の簡単な説明】
【図１】本発明による螺旋状鋼線の保持装置の平面図である。
【図２】図１のＩＩ−ＩＩ線に沿う断面図である。
【図３】図１のＩＩＩ線に沿う断面図である。
【図４】図１のＩＶ−ＩＶ線に沿う断面図である。
【図５】螺旋状鋼線を巻き付ける既設柱の縦断面図である。
【図６】螺旋状鋼線を巻き付ける既設柱の平面図である。
【図７】従来の螺旋状鋼線の巻き付け方法を説明する斜視図および側面図である。
【符号の説明】
１基材
２旋回部材
３受け部材
３ａ鉛直受け部材
３ｂ水平受け部材
３ｃ鉛直バー
３ｄ水平バー
４アーム
５形鋼
５ａ，５ｂセグメント
６，１１連結用リブ
７挿通穴
８ワイヤ
９ボールベアリング
１０ａ，１０ｂセグメント[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a helical steel wire holding device for holding a helical steel wire wound around an outer periphery of an existing column for reinforcement.
[0002]
[Prior art]
Conventionally, as a method of winding a spiral steel wire around the outer periphery of an existing column having a rectangular cross section, there is a method described in a patent belonging to the applicant of the present application (see, for example, Patent Document 1). In this method, as shown in FIGS. 7A and 7B, a spiral steel wire 31 processed into a spiral rectangular bundle slightly larger than the cross section of the existing column 51 is placed on the outer periphery of the base of the existing column 51. Standing vertically so that the bundle surface (loop surface) faces the outer surface, the tip bent at a right angle is inserted into a hole (not shown) provided perpendicular to the column surface of the existing column 51 and fixed, and the bundle surface is vertical. While being held in place, rotating around the existing pillar 51 in the direction indicated by the arrow Y while rotating in the direction shown by the arrow X in FIG. It is.
[0003]
When all the loops are horizontally overlapped with the outer periphery of the lower end of the existing column 51 as shown in the drawing and the winding is finished, the spirally attached steel bars 31 are inscribed at the four corners of the existing column 51 with an interval (see FIG. While being lifted along (not shown), it is fixed to the accessory bar with a binding wire so as to have a predetermined pitch in the height direction of the column, and is arranged over the entire length of the existing column 51. Finally, the mortar is sprayed with a predetermined thickness so as to cover the existing pillar 51 and the spiral steel wire 31, and the reinforcement of the existing pillar 51 is finished.
In this method of winding the helical steel wire, the steel wire 31 is wound around the existing column 51 while the steel wire 31 is looped around the existing column 51 without greatly deforming the helical steel wire 31 in the direction of opening the loop in the bundle plane. Since it can be wound in an elastic deformation range that can be twisted a little around it, it can be easily wound manually without the need for a large-scale machine such as a hydraulic cylinder, greatly reducing the labor and cost of construction. Thus, the shear strength and toughness of the existing column 51 can be improved, and the existing column 51 can be strongly reinforced against repeated loads caused by earthquakes.
[0004]
[Patent Document 1]
Japanese Patent No. 3190556
[Problems to be solved by the invention]
Recently, the applicant of the present application has proposed a new reinforcing method and reinforcing structure for an existing pillar, which has not been disclosed. As shown in FIGS. 5 and 6, this reinforcing method is as follows. First, a parallelogram-shaped concrete block 21 having a crescent-shaped cross-section with both ends cut off is surrounded by a cement paste 22 around an existing pillar 51 having a square cross-section. It sticks on the concrete block already pasted through the poor blending mortar 23 and covers the entire circumference up to the upper end of the existing column 51.
Next, a plurality of diagonally parallel parallel grooves are formed on the surface of each concrete block 21, and a spiral having a diameter of approximately 80% of the diagonal length of the existing column cross section is formed in one continuous spiral groove 24. A steel stranded wire 31 processed beforehand in a circle is wound by the same method as described in FIGS. 7 (A) and 7 (B). However, in this case, the loop of the stranded wire 31 is lifted and not fixed to the accessory bars at the four corners of the column with a binding wire, but the loop is lifted upward and fitted into the groove 24. Thus, the concrete block 21 is brought into close contact with the existing column 51 from the entire circumference by the stress accompanying the elastic deformation of the stranded wire wound over the entire length of the column, thereby improving the shear strength of the existing column 51 against the seismic load. . The end of the stranded wire and the start of the next stranded wire are connected to each other by attaching a grip to the outer periphery.
[0006]
However, the new reinforcing method of the existing pillar is that the diameter of the bundle of the stranded wires 31 is smaller than the diameter of the circle formed by the groove 24 that goes around the existing pillar 51. Therefore, as described in the conventional example of FIG. The bundle of the wires 31 cannot be pulled up after being entirely wound around the outer periphery of the lower end of the existing column 51, and the bundle of the stranded wires 31 is rotated around the existing column 51 while rotating in the direction of the arrow X in FIG. If it is necessary to lift in the direction of the arrow Y and further lift it, and the bundle of stranded wires leaves the ground, it becomes difficult to rotate the stranded wires in the direction of the arrow X and circulate in the direction of the arrow Y. A bundle of the stranded wires 31 has a total length of 50 m and a weight of 50 to 60 kg, and the worker moves up and down around the overhanging scaffold provided around the existing columns 51, and turns the stranded wires 31 into the existing columns 51. There is a problem in terms of safety, as well as a problem that the construction efficiency is lowered.
[0007]
Accordingly, an object of the present invention is to provide a helical steel wire holding device that can hold a helical steel wire such as a bundle of stranded wires around an existing column to facilitate winding and is easy to carry and assemble. It is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a helical steel wire holding device according to claim 1 includes a ring-shaped base material that can be divided, and a ring-shaped swiveling member that can be divided and is relatively rotatably mounted on the base material. And a receiving member provided on the swivel member to hold the steel wire formed in the spiral bundle.
[0009]
According to the above-described helical steel wire holding device, the divided base material is connected in a ring shape so as to surround the existing pillar and placed on the ground, and the divided swivel member is ring-shaped so as to surround the existing pillar. And mounted on a ring-shaped base material placed on the ground so as to be relatively rotatable. And after fixing the front-end | tip of the steel wire processed into the helical bundle | flux beforehand, for example to the rotation cylinder to the said ring-shaped turning member, the turning member is turned and the steel wire is made into the receiving member of this turning member. It winds up and hold | maintains all the bundles of a helical steel wire to a receiving member. Next, after fixing the tip of this spiral steel wire to the lower end of the existing column, the steel wire is wound upward in a spiral shape by, for example, fitting into the outer periphery of the existing column, for example, in a spiral groove. Along with the winding, the turning member placed on the ring-shaped base material turns in the winding direction while feeding the steel wire to facilitate manual winding.
[0010]
Here, if the processing diameter of the bundle of steel wires is made smaller than the diameter of the circle exhibited by the spiral groove that goes around the existing column and is held elastically in the receiving member of the turning member, the steel to be wound The wire is in close contact with the spiral groove and is less likely to fall off. When the winding to the existing pillar reaches a predetermined height, the winding is interrupted, the ring-shaped base material is moved together with the swivel member to the upper part of the scaffold provided around the existing pillar, and winding is started again. This is repeated to complete the winding over the entire length of the existing pillar. In this case, the operator does not need to rotate around the scaffold while rotating a bundle of heavy steel wires by hand as in the past, and only installs the ring-shaped base material above the scaffold. Winding can be performed, and work safety and construction efficiency can be greatly improved.
[0011]
According to a second aspect of the present invention, there is provided a helical steel wire holding device in which a suspension arm is provided on the outer periphery of the base material.
[0012]
According to the above-mentioned helical steel wire holding device, for example, a small winch or a chain block wire or chain provided at the upper end of the scaffold is connected to a suspension arm protruding from the outer periphery of the base material. The ring-shaped base material can be easily and safely moved upward with a winch or the like according to the winding, and the safety of work and the efficiency of construction can be further improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a plan view showing an embodiment of a helical steel wire holding device according to the present invention, and FIGS. 2, 3 and 4 are cross sections taken along lines II, III and IV of FIG. 1, respectively. FIG.
This helical steel wire holding device includes a ring-shaped base material 1 that can be divided into two at the position of line II-II in FIG. 2 to 4 show a steel-like revolving member 2 and a stranded wire 31 as a steel wire that is erected in a semicircular arc on the central axis of the revolving member 2 and is pre-processed into a spiral bundle. 1 is provided with a vertical receiving member 3a that is wound around and held on the outer periphery, and a suspension arm 4 that protrudes as shown in FIG.
[0014]
The base material 1 has a semicircular shape as shown in FIG. 1 such that the shape steel 5 having a U-shaped cross section as shown in FIG. 2 has a diameter slightly larger than the diameter of the existing column 51 with the web inside. The segments 5a and 5b are bent, and connecting ribs 6 having connecting bolt insertion holes 6a and 6b are attached to both ends of both segments so as to partition the U-shaped cross section. As shown in FIG. 4, the arm 4 is attached horizontally to the shape steel 5 having a U-shaped cross section of the base 1 by fillet welding the base, and the tip of the wire 8 that hangs from a small winch (not shown). Has a through-hole 7 to which is attached. Further, ball bearings 9 for rotatably supporting the swivel member 2 are attached to the upper surface of the flange of the shape steel 5 of the base member 1 at eight positions equally spaced in the circumferential direction as shown in FIG.
[0015]
On the other hand, the swivel member 2 is formed by bending a steel pipe into a semicircle having the same diameter as that of the base material 1 and cutting the pipe cross-section up and down along a horizontal plane that bisects the pipe cross section. Are formed into two segments 10a and 10b, and flat steel rolled into a semicircular arc having substantially the same radius as this segment is welded along the tops of the segments 10a and 10b to form the vertical receiving member 3a. As shown in FIG. 2, a connecting rib 11 having three connecting bolt insertion holes 11a is attached along the inner surface of the vertical receiving member 3a. Further, on the outer surface of the vertical receiving member 3a of each swiveling member 2, eight horizontal receiving members 3b are respectively projected at the positions shown in FIG. 1 as shown in FIG. A vertical bar 3c for prevention is provided, and a horizontal bar 3d for prevention of removal is provided at the top of the vertical receiving member 3a as shown in FIG.
The vertical receiving member 3a, the horizontal receiving member 3b, the vertical bar 3c, and the horizontal bar 3d constitute the receiving member 3 that holds the stranded wire 31 that has been previously processed into a spiral bundle.
[0016]
The strand wire 31 previously processed into the spiral bundle is wound around the existing column 51 using the helical steel wire holding device having the above configuration as follows.
First, a standard steel wire (for example, 50 m) is bent to a diameter of about 80% of the diameter of the spiral groove 24 of the existing pillar 51 shown in FIGS. Wrap and store. Next, semicircular segments 5a and 5b are arranged on the ground so as to surround the lower end of the existing pillar 51, and a pair of connecting ribs 6 at opposite ends are connected with bolts and nuts to form a ring-shaped base material. 1 is assembled, and then the semicircular segments 10a and 10b are similarly connected through the connecting ribs 11 to assemble the ring-shaped swiveling member 2, and the swiveling member 2 is attached to the eight ball bearings 9 of the substrate 1. Mount and turn freely.
Then, after the end of the stranded wire stored in the rotating cylinder is pulled out and fixed to the base end of the horizontal receiving member 3b of the turning member 2, the turning member 2 is turned to move the stranded wire 31 from the rotating cylinder to the outer periphery of the vertical receiving member 3a. As shown in FIGS. Since the stranded wire 31 processed to a diameter of 80% of the diameter of the spiral groove 24 is wound around the large-diameter vertical receiving member 3a, it is held in an elastically deformed state and stretched by a tensile force.
[0017]
Next, the end of the stranded wire 31 wound around the receiving member 3 is pulled out, bent at a right angle and inserted into a hole opened perpendicularly to the column surface at the base end of the existing column 51, and then the subsequent stranded wire 31 is pulled out. However, it is fitted upward into the spiral groove 24 of the existing pillar. Along with this, the turning member 2 supported by the ground base material 1 smoothly feeds the stranded wire 31 while turning in the fitting direction. Since the stranded wire 31 to be wound is bent to a small diameter of 80% of the diameter of the spiral groove 24, the elastic elongation is slightly relaxed, and the crescent-shaped concrete block 21 is provided with a square cross section. While pressing toward the column 51 from the outer periphery, the both are firmly integrated, and the spiral groove 24 does not fall off.
[0018]
When the winding to the existing column 51 reaches a predetermined height, the winding is interrupted, and the wires 8 connected as shown in FIG. 4 to the insertion holes 7 of the four arms 4 protruding from the outer periphery of the substrate 1 are not shown. It rolls up with the small winch provided in the top part of the circumference | surroundings scaffold, and raises the base material 1 to the winding position with the turning member 2. FIG. Thereafter, the winding of the stranded wire 31 is started again, the winding of the stranded wire 31 and the lifting of the substrate 1 are repeated, and the winding of the stranded wire 31 over the entire length of the existing column 51 is completed.
[0019]
Thus, according to the above-described helical steel wire holding device, the operator does not have to rotate up and down around the scaffold while rotating a bundle of heavy strands by hand as in the prior art. By simply pulling up the base material 1 using a small winch and rotating the swiveling member 2, a stranded wire can be wound around the entire length of the existing pillar, greatly increasing the safety and efficiency of the winding work. Can be improved.
Further, the holding device has a simple structure in which the two-part ring-shaped turning member 2 provided with the receiving member 3 is supported on the ball bearing 9 of the two-part ring-like base material 1, so that it is light and transported. , Can be easily assembled and pulled up.
[0020]
In the above embodiment, the swivel member 2 is supported by the ball bearing 9 on the base 1, but the swivel member may be supported by a roller or the like. Further, instead of the section steel 5 having a U-shaped cross section, an I-shaped steel or a square pipe can be used for the base material 1, and a section steel having a U-shaped cross section can be used for the turning member 2 instead of a half steel pipe. .
In the above embodiment, the vertical bar 3c is provided at the tip of the horizontal receiving member 3b and the horizontal bar 3d is provided at the top of the vertical receiving member 3a. However, the vertical bar 3c and the horizontal bar 3d of the receiving member 3 may be omitted. it can.
Furthermore, in the said embodiment, although the steel strand was used as a steel wire, it is also possible to use a small diameter steel bar.
[0021]
Further, the size and strength of the ring-shaped base material provided with the projecting suspension arm of the present invention is set so that an operator can get on, and a ring-shaped scaffold is attached over a plurality of arms, If the base material is moved up and down with a hoisting machine, the apparatus becomes large, but there is no need to provide a scaffold around the existing pillar, and there is an advantage that the safety and efficiency of the winding work can be further improved.
[0022]
【The invention's effect】
As is apparent from the above description, the helical steel wire holding device according to claim 1 has a ring-shaped base material that can be divided, and a ring-shaped base material that can be divided and mounted on the base material so as to be relatively rotatable. Since the swivel member and the receiving member provided on the swivel member to hold the steel wire formed in the spiral bundle are provided, the operator can turn the heavy steel wire bundle on the scaffold while rotating it by hand. It is no longer necessary to go up and down while turning around, and by simply moving the base material to the upper scaffold and turning the turning member, the steel wire can be wound around the entire length of the existing pillar, and the safety of winding work and The efficiency can be greatly improved, and the holding device has a simple structure, so that it is lightweight and can be easily transported, assembled and moved upward.
[0023]
The holding device for the helical steel wire according to claim 2 has a suspension arm projecting from the outer periphery of the base material, so that it can be more easily and more easily performed by a winch or the like without transferring the base material to the upper scaffold. The substrate can be safely pulled up, and the safety and efficiency of the winding work can be further improved.
[Brief description of the drawings]
FIG. 1 is a plan view of a helical steel wire holding device according to the present invention.
2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is a cross-sectional view taken along line III of FIG.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a longitudinal sectional view of an existing column around which a spiral steel wire is wound.
FIG. 6 is a plan view of an existing column around which a spiral steel wire is wound.
7A and 7B are a perspective view and a side view for explaining a conventional method of winding a helical steel wire.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base material 2 Turning member 3 Receiving member 3a Vertical receiving member 3b Horizontal receiving member 3c Vertical bar 3d Horizontal bar 4 Arm 5 Shape steel 5a, 5b Segment 6, 11 Connecting rib 7 Insertion hole 8 Wire 9 Ball bearing 10a, 10b Segment

Claims

分割可能なリング状の基材と、
分割可能で上記基材に相対回転可能に載置されたリング状の旋回部材と、
螺旋状の束に形成された鋼線を保持すべく上記旋回部材に設けられた受け部材を備えたことを特徴とする螺旋状鋼線の保持装置。A ring-shaped base material that can be divided;
A ring-shaped swivel member that can be divided and mounted on the base material so as to be relatively rotatable;
A holding device for a helical steel wire, comprising a receiving member provided on the swivel member to hold the steel wire formed in a spiral bundle.

請求項１に記載の螺旋状鋼線の保持装置において、上記基材の外周に吊り下げ用のアームを突設したことを特徴とする螺旋状鋼線の保持装置。2. The helical steel wire holding device according to claim 1, wherein an arm for suspension is provided on the outer periphery of the base material.