JP3828005B2 - Drilling centering jig and drilling method using drilling centering jig - Google Patents

Drilling centering jig and drilling method using drilling centering jig Download PDF

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JP3828005B2
JP3828005B2 JP2001377313A JP2001377313A JP3828005B2 JP 3828005 B2 JP3828005 B2 JP 3828005B2 JP 2001377313 A JP2001377313 A JP 2001377313A JP 2001377313 A JP2001377313 A JP 2001377313A JP 3828005 B2 JP3828005 B2 JP 3828005B2
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Prior art keywords
drilling
centering jig
hole
plate
existing concrete
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JP2001377313A
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JP2003175510A (en
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定雄 宇野
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Kumagai Gumi Co Ltd
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Kumagai Gumi Co Ltd
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Description

【0001】
【発明の属する技術分野】
この発明は、削孔芯出し治具及び削孔芯出し治具を用いた削孔方法に関するものであり、特に、既設コンクリートを補修するため、既設コンクリート表面にPC板を取付ける際に、該PC板を取付けるアンカーボルトのアンカーボルト埋込孔を削孔する削孔用ロッドを前記PC板の固定用孔に対し芯出しするための削孔芯出し治具及び削孔芯出し治具を用いた削孔方法に関するものである。
【0002】
【従来の技術及び発明が解決しようとする課題】
従来、既設コンクリートを補修する方法として、図4に示す如く、PC板(コンクリート製プレキャスト板)1,1…を用いて、既設コンクリート2の表面を蔽う方法が知られている。そして、この方法に於て、複数のPC板1,1…を平坦面状になるように取付けるため、例えば、図5に示す施工方法が知られている。該施工方法によると、まず、既設コンクリート2面の所定位置にアンカーボルト埋込孔3,3…を削孔し、このアンカーボルト埋込孔3,3…にアンカーボルト4,4…を埋込んで固定する。次に、施工するアンカーボルト4(図に於て上のアンカーボルト4)にコイルバネ5を装着し、更に、PC板1の固定用孔6部に固設されたワッシャー7の孔に前記アンカーボルト4を挿通させることにより、該PC板1を該アンカーボルト4に装着した後、ナット8を該アンカーボルト4に螺入して締付けることにより前記PC板1を前進させ、該PC板1と既設のPC板1(図に於て下のPC板1)との外側表面の位置が平坦になるように調整する。尚、ナット8を締付け過ぎた場合には、該ナット8を弛めることで前記コイルバネ5の反力により前記PC板1を後退させて位置調整する。
【0003】
又、図4に示す如く、前記PC板1,1…どうしを水平方向に連結するため、該PC板1,1…には隣接するPC板1,1間に挿通孔9,9…が水平方向に開穿され、該挿通孔9,9…の先端部に連結ナット10,10…が埋設されており、連結ボルト11,11…を該挿通孔9,9…を通して前記連結ナット10,10…に螺着することにより、隣接するPC板1,1どうしを連結する。
【0004】
そして、所定枚数のPC板1,1…を取付けた後、前記既設コンクリート2と該PC板1,1…の隙間にセメントミルクやモルタル等を充填する。
然しながら、前述の如く、前記アンカーボルト埋込孔3を前もって既設コンクリート2に所定の間隔で配置する場合、該アンカーボルト埋込孔3の配置誤差や、PC板1を取付ける際の組立て誤差が生じるため、該PC板1の固定用孔6とアンカーボルト埋込孔3との位置がずれ、PC板1設置作業が進むにつれて該PC板1の設置固定が困難になり、組立てが不可能となる虞があった。
【0005】
そのため、PC板1を仮設置した後に該PC板1に明けられた固定用孔6を通してアンカーボルト埋込孔3を開穿する方法が考えられるが、この場合、アンカーボルト埋込孔3の中心軸線とPC板1の固定用孔6の中心軸線とが一致する様に芯出ししてアンカーボルト埋込孔3を開穿し、PC板1とアンカーボルト4が直角になり、且つ、アンカーボルト4が固定用孔6の中心に来るようにアンカーボルト4を取付ける必要がある。
【0006】
そこで、既設コンクリート表面にPC板を取付ける既設コンクリートの補修に於て、PC板の固定用孔に芯出ししてアンカーボルト埋込孔を削孔できるようにするために解決すべき技術的課題が生じてくるのであり、本発明はこの課題を解決することを目的とする。
【0007】
【課題を解決するための手段】
本発明は上記目的を達成するために提案されたものであり、請求項1記載の発明は、円筒状の本体部の外周に雄ねじを螺刻し、且つ、該本体部を夫々断面略半円状の上半部と下半部の2つ割形状に形成すると共に、該上半部と下半部の接合面に摺動規制手段を設け、且つ、該上半部の外周両下端部に突設部を設け、更に、該突設部に対峙させて前記下半部
の外周両上端部に突設部を設け、相対峙する該突設部を固着自在とした削孔芯出し治具に於いて、上記摺動規制手段は上記接合面の長手方向に延びて設けられた上記本体部の径方向の段差と、該接合面の長手方向所定位置に所定幅で前記段差方向と反対方向に設けられた段差とから成り、既設コンクリートを補修する用に供する削孔芯出し治具
及び、請求項2記載の発明は、所定位置に固定用孔が開穿され、該固定用孔に雌ねじが螺刻された円筒状の金物が内装されたPC板を、既設コンクリート表面から所定間隔離間させて仮止めし、該PC板の外方から前記金物中心部を通して削孔用ロッドを貫通した後、該削孔用ロッドに、請求項1記載の削孔芯出し治具を遊嵌して、該削孔芯出し治具を互いに固着し、該削孔芯出し治具に螺刻された雄ねじを前記金物の雌ねじに螺入して該削孔芯出し治具を前記PC板に螺着することにより、前記PC板に内装された前記円筒状の金物に対し前記削孔用ロッドを芯出しし、前記既設コンクリートにアンカーボルト埋込孔を削孔することを特徴とする請求項1記載の削孔芯出し治具を使用する削孔方法を提供するものである。
【0008】
【発明の実施の形態】
以下、本発明の一実施の形態を図1乃至図3に従って詳述する。尚、説明の都合上、従来例と同一構成部分については同一符号を付してその説明を省略する。
図1に於いて、12は削孔芯出し治具であり、該削孔芯出し治具12は、円筒状の本体部13の外周に雄ねじ14が螺刻され、且つ、該本体部13は夫々断面略半円状の上半部15と下半部16の2つ割形状に形成されている。そして、該上半部15と下半部16の両接合面A,Aに摺動規制手段として該接合面A,Aの長手方向に延びて設けられた前記本体部13の径方向の段差B,Bと、該接合面A,Aの長手方向所定位置に所定幅で前記段差B,B方向と反対方向に設けられた段差C,Cが形成されている。
【0009】
更に、前記上半部15の外周両下端部に突設部17,18が設けられ、該突設部17,18に対峙させて前記下半部16の外周両上端部に突設部19,20が設けられている。尚、前記雄ねじ14は少なくとも該突設部17,18,19,20から前記本体部13の軸方向に離間した位置にも螺刻されている。
【0010】
又、相対峙する該突設部17,19及び18,20の略中心部に夫々上下方向に連続する孔21,22及び23,24が開穿され、該孔21,22及び23,24を貫通する螺子25及び26によって相対峙する該突設部17,19及び18,20が螺着自在に構成されている。
【0011】
而して、前記削孔芯出し治具12を用いた施工を行う場合は、図1及び図2に示す如く、所定位置に固定用孔4が開穿され、該固定用孔4に雌ねじ27が螺刻された円筒状の金物28が密嵌されたPC板1を、既設コンクリート2表面から所定間隔離間させて仮止めし、該PC板1の外方から前記金物28中心部を通して削孔用ロッド29を貫通する。尚、前記固定用孔4は前記PC板1の表面に対して直角に開穿され、従って、前記金物28も該PC板1表面に対し直角に設けられている。
【0012】
そして、該削孔用ロッド29に2分割された2つ割形状の前記削孔芯出し治具12を前記突設部17,18,19,20側を後方にして遊嵌し、該2つ割形状の削孔芯出し治具12を前記螺子25,26を用いて互いに固着し、該削孔芯出し治具12に螺刻された雄ねじ14を前記金物28の雌ねじ27に螺入して該削孔芯出し治具12を前記PC板1に螺着する。
【0013】
これにより、該削孔芯出し用治具12は前記金物28の中心に固着されると共に、前記PC板1に対し直角に固定されるから、該PC板1の固定用孔4及び金物28の中心軸線に対し前記削孔用ロッド29の中心軸線が芯出しされ、同時に、該削孔用ロッド29が前記PC板1に対して直角方向に位置決めされる。
【0014】
然る後に、該削孔用ロッド29を回転させて前記既設コンクリート2を削孔すると、前記PC板1の固定用孔4、及び、金物28に対して芯出しされ、且つ、該PC板1に直角に位置決めされたアンカーボルト埋込孔30が削孔される。削孔後は前記削孔芯出し治具12が取り外され、前記削孔用ロッド29も引き抜かれる。
【0015】
斯くして、前記削孔芯出し治具12は、簡易な方法で、前記削孔用ロッド29の前記PC板1の固定用孔4、及び、金物28に対する芯出しを行ない、且つ、該PC板1に対して直角方向に位置決めを行うことができ、従って、該削孔用ロッド29によって削孔されるアンカーボルト埋込孔30は前記PC板1の固定用孔4、及び、前記金物28に対して芯出しされ、且つ、該PC板1に対して直角方向に位置決めされる。又、前記削孔用ロッド29による削孔時に、前記PC板1に内装された前記金物28の雌ねじ27に該削孔用ロッド29が接触することがなく、該雌ねじ27の変形や破損を防止することができる。
【0016】
尚、前記削孔芯出し用治具12は本体部13を2つ割形状としたが、前記削孔用ロッド29のビット29aの径とロッド29bの径の差が小さい場合は、2つ割形状としないものでも使用することが可能である。但し、この場合の削孔芯出し用治具12の内径は前記ビット29aの外径よりも大きくする必要があり、又、施工時には、PC板1に削孔用ロッド29を貫通させる前に、ビット29aの先端からロッド29bに前記削孔芯出し用治具12を通しておくこととなる。
【0017】
図3は削孔後の施工方法を示し、前記既設コンクリート2に削孔されたアンカーボルト埋込孔30に固定用アンカー31を打ち込み、前記PC板1に内装された前記金物28の中心部を通して該固定用アンカー31にアンカーボルト4を螺入する。
【0018】
次に、該アンカーボルト4にコイルバネ5を遊嵌させて該コイルバネ5の先端部を該アンカーボルト4の所定位置に係止させ、且つ、前記金物28の雌ねじ27にねじ付きワッシャー32を螺合させて前記コイルバネ5の後端部を保持する。
【0019】
更に、前記アンカーボルト4にナット33を螺合して、前記ねじ付きワッッシャー32に接触させ、該ナット33を螺動することにより、前記アンカーボルト4に対する前記PC板1位置を調節し、該PC板1を所定の位置で保持する。そして、前記アンカーボルト4を前記ナット33の外側面に合わせて切断し、前記固定用孔6の隙間内に埋込剤34を埋め込む。
【0020】
同様にして他のPC板1を順次設置し、該PC板1を所定枚数設置した時、又は、該PC板1を設置終了後、既設コンクリート2とPC板1の隙間にセメントミルクやモルタル35を充填する。
尚、本発明は、本発明の精神を逸脱しない限り種々の改変を為すことができ、そして、本発明が該改変されたものに及ぶことは当然である。
【0021】
【発明の効果】
本発明は上記一実施の形態に詳述したように、請求項1記載の発明は、円筒状の本体部の外周に雄ねじを螺刻し、且つ、該本体部を夫々断面略半円状の上半部と下半部の2つ割形状に形成すると共に、該上半部と下半部の接合面に摺動規制手段を設け、且つ、該上半部の外周両下端部に突設部を設け、更に、該突設部に対峙させて前記下半部の外周両上端部に突設部を設け、相対峙する該突設部を固着自在とし、既設コンクリートの補修の用に供するから、前記削孔芯出し治具を用いて削孔用ロッドでアンカーボルト埋込孔を削孔する時、PC板に設けられた固定用孔、及び、金物の中心軸線の芯出しを行なうことができ、且つ、該PC板に対して直角方向に該削孔用ロッドの位置決めを行なうことができ、コンクリートの補修を効率的に行なうことができる
【0022】
従って、該削孔用ロッドによって削孔されるアンカーボルト埋込孔の中心軸線は前記PC板の固定用孔、及び、金物の中心軸線に対して芯出しされ、且つ、該PC板に対して直角方向に位置決めされて削孔される。又、前記削孔用ロッドによる削孔時に、前記PC板の固定用孔に内装された金物の雌ねじに該削孔用が接触することがなく該雌ねじの変形や破損を防止することができる。
【0023】
又、発明は、上記摺動規制手段は上記接合面の長手方向に延びて設けられた上記本体部の径方向の段差と、該接合面の長手方向所定位置に所定幅で前記段差方向と反対方向に設けられた段差とから成るので、前記の効果に加え、前記接合面の摺動が規制され、従って、前記本体部の上半部と下半部の互いの摺動が規制される。
【0024】
更に、請求項記載の発明は、所定位置に固定用孔が開穿され、該固定用孔に雌ねじが螺刻された円筒状の金物が内装されたPC板を、既設コンクリート表面から所定間隔離間させて仮止めし、該PC板の外方から前記金物中心部を通して削孔用ロッドを貫通した後、該削孔用ロッドに、請求項1記載の削孔芯出し治具を遊嵌して、該削孔芯出し治具を互いに固着し、該削孔芯出し治具に螺刻された雄ねじを前記金物の雌ねじに螺入して該削孔芯出し治具を前記PC板に螺着するから、既設コンクリート表面から所定間隔離間させてPC板を設置する際に、前記削孔芯出し治具を用いて削孔用ロッドでアンカーボルト埋込孔を削孔する時、請求項1記載の発明と同様の効果を有する等、正に著大な効果を奏する発明である。
【図面の簡単な説明】
【図1】(a)本発明の一実施の形態を示し、削孔芯出し治具の正面図。
(b)本発明の一実施の形態を示し、削孔芯出し治具の側面図。
(c)図1(b)のD−D縦断面図。
【図2】図1に示す削孔芯出し治具を用いて削孔を行う状態を説明する側面縦断面図。
【図3】本発明の一実施の形態を示し、既設コンクリートの補修完成状態を示す縦断面図。
【図4】従来例を示し、既設コンクリート補修方法を示す正面図。
【図5】従来例を示し、既設コンクリートの補修方法を示す側面縦断面図。
【符号の説明】
1 PC板
2 既設コンクリート
6 固定用孔
12 削孔芯出し治具
13 本体部
14 雄ねじ
15 上半部
16 下半部
17,18,19,20 突設部
27 雌ねじ
28 金物
29 削孔用ロッド
A 接合面
B,C 段差
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drilling centering jig and a drilling method using the drilling centering jig, and in particular, when a PC plate is attached to an existing concrete surface in order to repair the existing concrete, the PC A drilling centering jig and a drilling centering jig for centering a drilling rod for drilling an anchor bolt embedding hole of an anchor bolt for mounting a plate with respect to a fixing hole of the PC plate were used. The present invention relates to a drilling method.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, as a method for repairing existing concrete, a method of covering the surface of existing concrete 2 using PC plates (concrete precast plates) 1, 1. In this method, for example, a construction method shown in FIG. 5 is known in order to attach a plurality of PC plates 1, 1. According to this construction method, first, anchor bolt embedding holes 3, 3... Are drilled at predetermined positions on two existing concrete surfaces, and anchor bolts 4, 4,. Secure with. Next, a coil spring 5 is attached to the anchor bolt 4 (upper anchor bolt 4 in the figure) to be constructed, and the anchor bolt is inserted into the hole of the washer 7 fixed to the fixing hole 6 portion of the PC board 1. 4, the PC plate 1 is mounted on the anchor bolt 4, and then the nut 8 is screwed into the anchor bolt 4 and tightened to advance the PC plate 1. The PC board 1 (lower PC board 1 in the figure) is adjusted so that the position of the outer surface becomes flat. If the nut 8 is tightened excessively, the PC plate 1 is moved backward by the reaction force of the coil spring 5 by loosening the nut 8 to adjust the position.
[0003]
Further, as shown in FIG. 4, in order to connect the PC plates 1, 1... In the horizontal direction, the PC plates 1, 1. The connecting nuts 10, 10... Are embedded in the end portions of the insertion holes 9, 9,..., And the connecting bolts 11, 11,. The adjacent PC plates 1 and 1 are connected by being screwed to.
[0004]
Then, after a predetermined number of PC plates 1, 1... Are attached, a gap between the existing concrete 2 and the PC plates 1, 1.
However, as described above, when the anchor bolt embedding holes 3 are arranged in the existing concrete 2 at a predetermined interval in advance, an arrangement error of the anchor bolt embedding holes 3 and an assembly error when attaching the PC plate 1 occur. Therefore, the positions of the fixing hole 6 of the PC plate 1 and the anchor bolt embedding hole 3 are shifted, and as the PC plate 1 installation operation proceeds, the installation and fixing of the PC plate 1 becomes difficult and assembly becomes impossible. There was a fear.
[0005]
For this reason, a method of opening the anchor bolt embedded hole 3 through the fixing hole 6 opened in the PC plate 1 after temporarily installing the PC plate 1 is conceivable. In this case, the center of the anchor bolt embedded hole 3 is considered. Centering is made so that the axis line and the center axis line of the fixing hole 6 of the PC plate 1 coincide with each other, the anchor bolt embedding hole 3 is opened, the PC plate 1 and the anchor bolt 4 become perpendicular, and the anchor bolt It is necessary to attach the anchor bolt 4 so that 4 comes to the center of the fixing hole 6.
[0006]
Therefore, there is a technical problem to be solved in order to be able to drill the anchor bolt embedding hole by centering on the fixing hole of the PC plate in the repair of the existing concrete where the PC plate is attached to the existing concrete surface. The present invention aims to solve this problem.
[0007]
[Means for Solving the Problems]
The present invention has been proposed to achieve the above object, and the invention according to claim 1 is characterized in that a male screw is threaded on the outer periphery of a cylindrical main body , and each of the main bodies is substantially semicircular in cross section. The upper half part and the lower half part of the upper half part are formed in a split shape, and sliding restriction means is provided on the joint surface of the upper half part and the lower half part, and both outer peripheral lower ends of the upper half part are provided. A drilling centering jig provided with a projecting portion, further provided with projecting portions on both upper ends of the outer periphery of the lower half so as to face the projecting portion, and allowing the projecting portions facing each other to be fixed freely The sliding restricting means includes a radial step of the main body portion extending in the longitudinal direction of the joint surface, and a predetermined width at a predetermined position in the longitudinal direction of the joint surface and a direction opposite to the step direction. consists of a step provided, drilling centering jig and offer for repairing the existing concrete, the invention of claim 2 wherein the solid in a predetermined position A PC plate having a cylindrical hole with a female hole screwed into the fixing hole is temporarily fixed at a predetermined distance from the surface of the existing concrete, and from the outside of the PC plate After penetrating the drilling rod through the metal center, the drilling centering jig according to claim 1 is loosely fitted to the drilling rod, and the drilling centering jig is fixed to each other. The cylinder built in the PC plate is formed by screwing the male screw threaded into the hole drilling centering jig into the female screw of the hardware and screwing the hole drilling centering jig onto the PC board. 2. A drilling method using a drilling hole centering jig according to claim 1, wherein the drilling rod is centered with respect to a metal piece and an anchor bolt embedding hole is drilled in the existing concrete. Is to provide.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. For convenience of explanation, the same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.
In FIG. 1, reference numeral 12 denotes a drilling centering jig. The drilling centering jig 12 has a male screw 14 threaded on the outer periphery of a cylindrical main body 13, and the main body 13 is Each of the upper half portion 15 and the lower half portion 16 is formed in a bifurcated shape having a substantially semicircular cross section. Then, a radial step B of the main body portion 13 provided on the joint surfaces A, A of the upper half portion 15 and the lower half portion 16 so as to extend in the longitudinal direction of the joint surfaces A, A as a sliding restricting means. , B and steps C, C provided at predetermined positions in the longitudinal direction of the joint surfaces A, A with a predetermined width and in a direction opposite to the steps B, B.
[0009]
Further, projecting portions 17 and 18 are provided on both lower ends of the outer periphery of the upper half portion 15, and projecting portions 19 and 18 are provided on both upper ends of the outer periphery of the lower half portion 16 so as to face the projecting portions 17 and 18. 20 is provided. The male screw 14 is also threaded at least at a position spaced apart from the projecting portions 17, 18, 19, 20 in the axial direction of the main body 13.
[0010]
Further, holes 21, 22, 23, and 24, which are continuous in the vertical direction, are opened at substantially the center portions of the projecting portions 17, 19, and 18, 20 that face each other, and the holes 21, 22, 23, and 24 are formed. The projecting portions 17, 19, 18, and 20 that are opposed to each other by the penetrating screws 25 and 26 are configured to be screwable.
[0011]
Thus, when performing construction using the hole drilling centering jig 12, the fixing hole 4 is opened at a predetermined position as shown in FIGS. 1 and 2, and the female screw 27 is inserted into the fixing hole 4. A PC plate 1 in which a cylindrical metal piece 28 in which is screwed is tightly fitted is temporarily fixed at a predetermined distance from the surface of the existing concrete 2, and a hole is drilled from the outside of the PC plate 1 through the center of the metal piece 28. The rod 29 is penetrated. The fixing hole 4 is opened at a right angle with respect to the surface of the PC plate 1, and accordingly, the hardware 28 is also provided at a right angle with respect to the surface of the PC plate 1.
[0012]
Then, the split drilling centering jig 12 is divided into two into the drilling rod 29 and loosely fitted with the projecting portions 17, 18, 19, and 20 on the rear side. The split-shaped drilling centering jig 12 is fixed to each other using the screws 25 and 26, and the male screw 14 screwed into the drilling hole centering jig 12 is screwed into the female screw 27 of the hardware 28. The drilling centering jig 12 is screwed to the PC plate 1.
[0013]
As a result, the drilling centering jig 12 is fixed to the center of the hardware 28 and is fixed at a right angle to the PC plate 1, so that the fixing holes 4 and the hardware 28 of the PC plate 1 are fixed. The center axis of the drilling rod 29 is centered with respect to the center axis, and at the same time, the drilling rod 29 is positioned in a direction perpendicular to the PC plate 1.
[0014]
Thereafter, when the drilling rod 29 is rotated and the existing concrete 2 is drilled, the fixing hole 4 of the PC plate 1 and the hardware 28 are centered, and the PC plate 1 The anchor bolt embedding hole 30 positioned at right angles to is drilled. After the drilling, the drilling centering jig 12 is removed, and the drilling rod 29 is also pulled out.
[0015]
Thus, the drilling centering jig 12 performs the centering of the drilling rod 29 on the fixing hole 4 of the PC plate 1 and the hardware 28 by a simple method, and the PC. Positioning can be performed in a direction perpendicular to the plate 1. Therefore, the anchor bolt embedded hole 30 drilled by the drilling rod 29 is the fixing hole 4 of the PC plate 1 and the hardware 28. And is positioned in a direction perpendicular to the PC plate 1. Further, when drilling with the drilling rod 29, the drilling rod 29 does not come into contact with the female screw 27 of the hardware 28 built in the PC plate 1, thereby preventing deformation and breakage of the female screw 27. can do.
[0016]
The hole drilling centering jig 12 has the main body 13 divided into two parts. However, when the difference between the diameter of the bit 29a and the diameter of the rod 29b of the drilling rod 29 is small, it is divided into two parts. It is possible to use a non-shaped one. However, the inner diameter of the drilling centering jig 12 in this case needs to be larger than the outer diameter of the bit 29a, and at the time of construction, before passing the drilling rod 29 through the PC plate 1, The drilling centering jig 12 is passed through the rod 29b from the tip of the bit 29a.
[0017]
FIG. 3 shows a construction method after drilling. A fixing anchor 31 is driven into an anchor bolt embedding hole 30 drilled in the existing concrete 2, and passes through the central portion of the hardware 28 built in the PC plate 1. The anchor bolt 4 is screwed into the anchor 31 for fixing.
[0018]
Next, the coil spring 5 is loosely fitted to the anchor bolt 4 so that the tip end portion of the coil spring 5 is locked at a predetermined position of the anchor bolt 4, and the threaded washer 32 is screwed to the female screw 27 of the hardware 28. The rear end of the coil spring 5 is held.
[0019]
Further, the nut 33 is screwed onto the anchor bolt 4 to contact the threaded washer 32, and the nut 33 is screwed to adjust the position of the PC plate 1 relative to the anchor bolt 4, and the PC The plate 1 is held at a predetermined position. Then, the anchor bolt 4 is cut along the outer surface of the nut 33, and the embedding agent 34 is embedded in the gap of the fixing hole 6.
[0020]
Similarly, when another PC board 1 is installed sequentially and a predetermined number of PC boards 1 are installed or after the PC board 1 is installed, cement milk or mortar 35 is placed in the gap between the existing concrete 2 and the PC board 1. Fill.
It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified one.
[001]
【The invention's effect】
As described in detail in the above embodiment, the present invention is characterized in that a male screw is threaded on the outer periphery of a cylindrical main body, and each main body has a substantially semicircular cross section. The upper half part and the lower half part are formed in a split shape, and sliding restriction means are provided on the joint surface of the upper half part and the lower half part, and projecting from both lower ends of the outer periphery of the upper half part And projecting portions at both upper ends of the outer periphery of the lower half so that the projecting portions facing each other can be fixed and used for repairing existing concrete When the anchor bolt embedded hole is drilled with the drilling rod using the drilling centering jig, the fixing hole provided on the PC plate and the center axis of the hardware are centered. It can be, and can perform positioning of該削holes rod in a direction perpendicular to the PC board, effectively line repair of concrete Ukoto can.
[0022]
Therefore, the central axis of the anchor bolt embedding hole drilled by the drilling rod is centered with respect to the fixing hole of the PC plate and the central axis of the hardware, and to the PC plate It is positioned in a perpendicular direction and drilled. Further, when drilling with the drilling rod, the drilling hole does not come into contact with the female screw of the hardware housed in the fixing hole of the PC plate, and deformation and breakage of the female screw can be prevented.
[0023]
Further, according to the present invention, the sliding restricting means extends in the longitudinal direction of the joining surface, the radial step of the main body, and the step direction with a predetermined width at a predetermined position in the longitudinal direction of the joining surface. In addition to the above-described effects, sliding of the joint surface is restricted, and thus sliding of the upper half and lower half of the main body is restricted. .
[0024]
Furthermore, in the invention described in claim 2, a PC board having a fixing hole opened at a predetermined position, and a cylindrical metal fitting with a female screw threaded in the fixing hole is provided at a predetermined distance from the surface of the existing concrete. The hole drilling centering jig according to claim 1 is loosely fitted to the hole drilling rod after being spaced apart and temporarily fixed, penetrating the hole drilling rod from the outside of the PC plate through the center of the hardware. Then, the drilling centering jig is fixed to each other, and the male screw threaded on the drilling centering jig is screwed into the female screw of the hardware, and the drilling centering jig is screwed onto the PC board. When the PC board is installed at a predetermined distance from the existing concrete surface, the anchor bolt embedding hole is drilled with the drilling rod using the drilling centering jig. It is an invention that has a significant effect, such as having the same effect as the described invention.
[Brief description of the drawings]
FIG. 1A is a front view of a drilling centering jig according to an embodiment of the present invention.
(B) Side view of a drilling centering jig showing an embodiment of the present invention.
(C) DD longitudinal cross-sectional view of FIG.1 (b).
FIG. 2 is a side longitudinal sectional view for explaining a state in which drilling is performed using the drilling centering jig shown in FIG.
FIG. 3 is a vertical sectional view showing an embodiment of the present invention and showing a completed state of existing concrete.
FIG. 4 is a front view showing an existing concrete repair method showing a conventional example.
FIG. 5 is a side longitudinal sectional view showing a conventional example and showing a method for repairing existing concrete.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 PC board 2 Existing concrete 6 Fixing hole 12 Drilling hole centering jig | tool 13 Main-body part 14 Male screw 15 Upper half part 16 Lower half part 17, 18, 19, 20 Projection part 27 Female thread 28 Hardware 29 Drilling rod A Bonding surfaces B, C steps

Claims (2)

円筒状の本体部の外周に雄ねじを螺刻し、且つ、該本体部を夫々断面略半円状の上半部と下半部の2つ割形状に形成すると共に、該上半部と下半部の接合面に摺動規制手段を設け、且つ、該上半部の外周両下端部に突設部を設け、更に、該突設部に対峙させて前記下半部の外周両上端部に突設部を設け、相対峙する該突設部を固着自在とした削孔芯出し治具に於いて、上記摺動規制手段は上記接合面の長手方向に延びて設けられた上記本体部の径方向の段差と、該接合面の長手方向所定位置に所定幅で前記段差方向と反対方向に設けられた段差とから成り、既設コンクリートを補修する用に供することを特徴とする削孔芯出し治具。 A male screw is threaded on the outer periphery of the cylindrical main body, and the main body is formed in a split shape of an upper half and a lower half with a substantially semicircular cross section. Sliding restricting means is provided on the joint surface of the half, and protrusions are provided at both lower ends of the outer periphery of the upper half, and further, both upper ends of the outer periphery of the lower half are opposed to the protrusion. In the drilling centering jig provided with a projecting portion on the surface and the projecting portion facing each other can be fixed , the slide restricting means extends in the longitudinal direction of the joining surface, and the main body portion is provided. And a step provided in a predetermined position in the longitudinal direction of the joint surface with a predetermined width and a direction opposite to the step direction, and used for repairing existing concrete. Out jig. 所定位置に固定用孔が開穿され、該固定用孔に雌ねじが螺刻された円筒状の金物が内装されたPC板を、既設コンクリート表面から所定間隔離間させて仮止めし、該PC板の外方から前記金物中心部を通して削孔用ロッドを貫通した後、該削孔用ロッドに、請求項1記載の削孔芯出し治具を遊嵌して、該削孔芯出し治具を互いに固着し、該削孔芯出し治具に螺刻された雄ねじを前記金物の雌ねじに螺入して該削孔芯出し治具を前記PC板に螺着することにより、前記PC板に内装された前記円筒状の金物に対し前記削孔用ロッドを芯出しし、前記既設コンクリートにアンカーボルト埋込孔を削孔することを特徴とする請求項1記載の削孔芯出し治具を使用する削孔方法。A PC board, in which a fixing hole is opened at a predetermined position, and a cylindrical metal object in which a female screw is screwed into the fixing hole, is temporarily fixed at a predetermined interval from the existing concrete surface, and the PC board The hole drilling centering jig according to claim 1 is loosely fitted to the hole drilling rod after passing the hole drilling rod from the outside through the metal center portion, and the hole drilling centering jig is By fixing the male screw threaded on the hole drilling centering jig into the female screw of the hardware and screwing the hole centering jig on the PC board, 2. The drilling centering jig according to claim 1, wherein the drilling rod is centered with respect to the cylindrical metal piece, and an anchor bolt embedding hole is drilled in the existing concrete. Drilling method to do.
JP2001377313A 2001-12-11 2001-12-11 Drilling centering jig and drilling method using drilling centering jig Expired - Fee Related JP3828005B2 (en)

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