JP2013032802A - Method and jig for repairing flange joint - Google Patents

Method and jig for repairing flange joint Download PDF

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JP2013032802A
JP2013032802A JP2011168773A JP2011168773A JP2013032802A JP 2013032802 A JP2013032802 A JP 2013032802A JP 2011168773 A JP2011168773 A JP 2011168773A JP 2011168773 A JP2011168773 A JP 2011168773A JP 2013032802 A JP2013032802 A JP 2013032802A
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screw shaft
shaft portion
resin
leakage
sealing material
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JP5876245B2 (en
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Masaaki Ishikawa
雅章 石川
Yukinobu Satake
志伸 佐竹
Kazutada Takeuchi
一恭 竹内
Tomoharu Oyama
智春 大山
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KANDO KK
Tokyo Gas Co Ltd
Kando Co Ltd
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KANDO KK
Tokyo Gas Co Ltd
Kando Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To quickly stop leakage or eliminate the risk of leakage, in a flange joint in which leakage is detected or leakage is likely to occur.SOLUTION: The method for repairing a flange joint includes the steps of: joining both ends of a band-shaped sealing member 1 to form a ring shape; covering a flange outer periphery F1 with the ring-shaped sealing member 1; winding a fastening band 2 on the outside of the sealing member 1 to form a ring shape via a stopper 3 and fastening the fastening band 2 to fix the stopper 3; checking leakage in a bolt/nut F3 of the flange joint F to be repaired; removing the bolt/nut F3 in which leakage is identified to insert a repair jig 10 into a bolt hole of the bolt/nut F3; and filling the bolt hole with a resin sealing material via the repair jig 10.

Description

本発明は、フランジ継手の漏洩を修理するための工法及びそれに用いられる修理用治具に関するものである。   The present invention relates to a method for repairing leakage of a flange joint and a repair jig used therefor.

流体輸送を行う既設配管の漏洩原因の一つに継手部の気密性低下を挙げることができる。特に、フランジ継手の場合は、継手部に介在するパッキン材の老朽化や継手部を接合するボルト・ナットの経時的な緩みなどによって気密性が低下して漏洩が生じる。   One of the causes of leakage of existing pipes that perform fluid transportation is a decrease in the airtightness of the joint. In particular, in the case of a flange joint, airtightness is deteriorated due to aging of the packing material interposed in the joint part or loosening of bolts and nuts for joining the joint part over time, and leakage occurs.

フランジ継手の漏洩修理工法としては、フランジ外周を環状のリング部材によって囲繞してシール補強する工法(下記特許文献1参照)、或いは、フランジ継手を囲むカバー枠内に樹脂などのシール材を充填させる工法(下記特許文献2)が知られている。   As a leakage repair method for flange joints, a method for reinforcing the seal by enclosing the outer periphery of the flange with an annular ring member (see Patent Document 1 below), or filling a cover frame surrounding the flange joint with a sealing material such as resin. A construction method (Patent Document 2 below) is known.

特開昭57−15188号公報JP-A-57-15188 特開昭57−116992号公報JP 57-116992 A

フランジ継手の漏洩を修理するに際して、従来技術のような工法を採用するためには、既設配管の個々のフランジ継手に対してリング部材やカバー枠といった個別資材を用意する必要がある。フランジ継手には複数の規格があるため、漏洩が検知されたか或いは漏洩の懸念がある個々のフランジ継手に対して、現場で寸法を確認してから、その寸法に応じたリンク部材やカバー枠を製作することになり、その製作に時間を要し、その間漏洩や漏洩のリスクが継続し続ける問題があった。また、フランジ継手の漏洩を修理するに際して、バルブピット内などの狭隘部や他の配管などの既設構造物との離間距離が確保できない現場があり、このような現場においては従来工法では施工ができない場合があった。   When repairing the leakage of the flange joint, it is necessary to prepare individual materials such as a ring member and a cover frame for each flange joint of the existing piping in order to adopt the construction method as in the prior art. Since there are multiple standards for flange joints, check the dimensions of each flange joint for which leakage has been detected or there is a risk of leakage, and then attach a link member or cover frame according to the dimensions. There was a problem that it took time to manufacture, and the risk of leakage and leakage continued during that time. In addition, when repairing leakage of a flange joint, there is a site where it is not possible to secure a separation distance from an existing structure such as a narrow part in the valve pit or other piping, and in such a site, construction cannot be performed by the conventional method. There was a case.

本発明は、このような問題に対処することを課題の一例とするものである。すなわち、漏洩が検知されたか或いは漏洩の懸念があるフランジ継手に対して、速やかに漏洩を抑止するか、或いは漏洩のリスクを排除することができること、狭隘部や既設構造物との離間距離が確保できない現場であっても円滑に修理作業を施工することができること、等が本発明の目的である。   This invention makes it an example of a subject to cope with such a problem. That is, for flange joints where leakage is detected or there is a risk of leakage, leakage can be quickly suppressed or the risk of leakage can be eliminated, and a separation distance from a narrow part or existing structure is ensured. An object of the present invention is that repair work can be smoothly performed even at a site where it is impossible.

このような目的を達成するために、本発明によるフランジ継手の修理工法は、以下の構成を少なくとも具備するものである。   In order to achieve such an object, the flange joint repair method according to the present invention comprises at least the following configuration.

帯状の封止材の両端を接合してリング状にする工程と、リング状にした前記封止材をフランジ外周に被せる工程と、締め付けバンドを前記封止材の外側に巻回して止め具を介してリング状にし、該締め付けバンドを締め付けた後、前記止め具を固定する工程と、修理対象のフランジ継手のボルト・ナットにおける漏洩を確認する工程と、漏洩が確認された箇所のボルト・ナットを取り外し、該ボルト・ナットのボルト孔に修理用治具を挿入する工程と、前記修理用治具を介して前記ボルト孔に樹脂シール材を充填する工程とを有し、前記修理用治具は、前記ボルト孔に挿入されるねじ軸部と、前記ねじ軸部の一端側に固定又は螺合される第1ナット部と、前記ねじ軸部の他端側に螺合される第2ナット部とを備え、前記ねじ軸部には前記ボルト孔に樹脂を充填させる樹脂注入溝が軸方向に沿って設けられ、前記第2ナット部には前記樹脂注入溝に直接又は前記ねじ軸部のねじ溝を介して連通する接続孔が複数設けられ、複数の前記接続孔の一つに樹脂シール材注入器を接続すると共に、前記接続孔の残りの全てを栓で塞ぐことを特徴とするフランジ継手の修理工法。   A step of joining the both ends of the band-shaped sealing material to form a ring, a step of covering the ring-shaped sealing material on the outer periphery of the flange, and winding a fastening band around the outer side of the sealing material And tightening the fastening band, and then fixing the fastener, checking the leakage of the bolt and nut of the flange joint to be repaired, and the bolt and nut at the location where the leakage is confirmed And the step of inserting a repair jig into the bolt hole of the bolt and nut, and the step of filling the bolt hole with a resin sealant through the repair jig, the repair jig The screw shaft portion inserted into the bolt hole, the first nut portion fixed or screwed to one end side of the screw shaft portion, and the second nut screwed to the other end side of the screw shaft portion And the screw shaft portion includes the bolt. A resin injection groove for filling the hole with resin is provided along the axial direction, and the second nut portion is provided with a plurality of connection holes communicating with the resin injection groove directly or via the screw groove of the screw shaft portion. A flange joint repair method characterized in that a resin sealer injector is connected to one of the plurality of connection holes, and all the remaining connection holes are closed with stoppers.

また、本発明によるフランジ継手の修理用治具は、以下の構成を具備している。   The jig for repairing a flange joint according to the present invention has the following configuration.

フランジ継手のボルト孔に樹脂シール材を充填させるための修理用治具であって、前記ボルト孔に挿入されるねじ軸部と、前記ねじ軸部の一端側に固定又は螺合される第1ナット部と、前記ねじ軸部の他端側に螺合される第2ナット部とを備え、前記ねじ軸部には前記ボルト孔に樹脂を充填させる樹脂注入溝が軸方向に沿って設けられ、前記第2ナット部には前記樹脂注入溝に直接又は前記ねじ軸部のねじ溝を介して連通する接続孔が複数設けられ、複数の前記接続孔の一つに樹脂シール材注入器が接続されると共に、前記接続孔の残りの全てが栓で塞がれることを特徴とする修理用治具。   A repair jig for filling a resin sealant into a bolt hole of a flange joint, and a first screw shaft portion inserted into the bolt hole and fixed or screwed to one end side of the screw shaft portion. A nut portion and a second nut portion screwed into the other end side of the screw shaft portion, and a resin injection groove for filling the bolt hole with resin is provided along the axial direction in the screw shaft portion. The second nut portion is provided with a plurality of connection holes communicating with the resin injection groove directly or via the screw groove of the screw shaft portion, and a resin seal material injector is connected to one of the plurality of connection holes. And a repair jig, wherein all of the remaining connection holes are closed with plugs.

このような特徴を有する本発明は、様々な寸法を有するフランジ継手に対して、帯状の封止材の両端を接合してリング状にし、その外側を締め付けバンドで締め付けて固定するので、現場での対応で速やかにフランジ継手の漏洩を抑止することができる。そして、ボルト孔に漏洩が移行した場合は、ボルト・ナットを修理用治具に差し替えてボルト孔に樹脂シール材を充填させることができるのでフランジ継手の漏洩を抑止することができる。   In the present invention having such a feature, both ends of the band-shaped sealing material are joined to a ring joint with various dimensions, and the outside thereof is fastened and fixed with a tightening band. This makes it possible to quickly prevent the flange joint from leaking. And when leakage shifts to the bolt hole, the bolt and nut can be replaced with a repair jig and the bolt hole can be filled with the resin sealant, so that leakage of the flange joint can be suppressed.

また、修理用治具には、第2ナット部に接続孔が複数設けられているので、第2ナット部を締め付けた場合に複数の接続孔のうち接続し易いものに樹脂シール材注入器を接続して、他の接続孔を栓で塞ぐことができ、樹脂シール材注入時の作業性を向上させることができる。   In addition, since the repair jig has a plurality of connection holes in the second nut portion, a resin seal material injector is attached to one of the plurality of connection holes that is easily connected when the second nut portion is tightened. By connecting, the other connection holes can be closed with plugs, and the workability at the time of injecting the resin sealing material can be improved.

本発明の一実施形態に係るフランジ継手の修理工法における一工程を示した説明図である。It is explanatory drawing which showed one process in the repair method of the flange joint which concerns on one Embodiment of this invention. 本発明の一実施形態に係るフランジ継手の修理工法における一工程を示した説明図である。It is explanatory drawing which showed one process in the repair method of the flange joint which concerns on one Embodiment of this invention. 本発明の一実施形態に係るフランジ継手の修理工法における一工程を示した説明図である。It is explanatory drawing which showed one process in the repair method of the flange joint which concerns on one Embodiment of this invention. 本発明の一実施形態に係るフランジ継手の修理工法における一工程を示した説明図である。It is explanatory drawing which showed one process in the repair method of the flange joint which concerns on one Embodiment of this invention. 本発明の一実施形態に係る修理用治具の構造及びフランジ継手の修理工法における一工程を示した説明図である。It is explanatory drawing which showed 1 process in the repair construction method of the structure of the repair jig | tool and flange joint which concern on one Embodiment of this invention. 本発明の一実施形態に係るフランジ継手の修理工法における一工程を示した説明図である。It is explanatory drawing which showed one process in the repair method of the flange joint which concerns on one Embodiment of this invention.

以下、図面を参照しながら本発明の実施形態を説明する。図1〜6は、本発明の一実施形態に係るフランジ継手の修理工法における一工程を示した説明図である。フランジ継手Fは、互いに突き合わされた一対のフランジF2がボルト・ナットF3で接合されている。既設の配管Pのフランジ継手Fにおいて漏洩が確認された場合には、図1に示すように、先ず第1の工程として、帯状の封止材1の両端を接合してリング状にする。封止材1としては、例えば、弾性があり比較的伸びの少ないゴム製の帯状板材を用いることができる。封止材1の接合に際しては接着剤を用い、接着剤が硬化するまで所定時間(5分程度)養生を行う。更に、接合箇所にシリコン樹脂を10mm〜20mm塗布して所定時間(10分程度)養生することで、接合箇所からの漏洩を抑止することが可能になる。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1-6 is explanatory drawing which showed one process in the repair method of the flange joint which concerns on one Embodiment of this invention. In the flange joint F, a pair of flanges F2 butted against each other are joined by bolts and nuts F3. When leakage is confirmed in the flange joint F of the existing piping P, as shown in FIG. 1, first, as a 1st process, the both ends of the strip | belt-shaped sealing material 1 are joined and it is made into a ring shape. As the sealing material 1, for example, a rubber belt-like plate material having elasticity and relatively little elongation can be used. When the sealing material 1 is joined, an adhesive is used, and curing is performed for a predetermined time (about 5 minutes) until the adhesive is cured. Furthermore, it is possible to suppress leakage from the joint location by applying 10 mm to 20 mm of silicon resin to the joint location and curing for a predetermined time (about 10 minutes).

次の工程では、図2に示すように、リング状にした封止材1をフランジ外周F1に被せる。この際、フランジ外周F1に検漏液を塗って漏洩箇所を特定し、封止材1の接合箇所1Aを特定した漏洩箇所から90°回した位置に合わせることが好ましい。また、シリコン樹脂を接合箇所1Aに塗布した場合には、シリコン樹脂の塗布面をフランジ外周側に裏返して被せることが好ましい。   In the next step, as shown in FIG. 2, a ring-shaped sealing material 1 is placed on the flange outer periphery F1. At this time, it is preferable to apply a leak detection liquid to the flange outer periphery F1 to identify the leak location, and to match the joining location 1A of the sealing material 1 to the position rotated 90 ° from the identified leak location. In addition, when silicon resin is applied to the joint 1A, it is preferable that the silicon resin application surface is turned over to the flange outer peripheral side.

次の工程では、図3に示すように、締め付けバンド2を封止材1の外側に巻回して止め具3を介してリング状にし、締め付けバンド2を締め付けた後、止め具3を固定する。締め付けバンド2としては、金属製の帯状薄板部材を用いることができる。止め具3は、金属製の扁平な筒状部材で構成することができる。止め具3内に一方側から締め付けバンド2の一端を挿入して通過させた後に先端を折り曲げ、締め付けバンド2の他端を止め具3内に他方側から挿入して締め付けバンド2をリング状にする。締め付けバンド2の他端側を図示の矢印のように引っ張ることで封止材1に締め付け力を付加する。十分な締め付け力が付加された状態で止め具3を固定する。止め具3には止めねじ3Aをねじ込むねじ孔が設けられており、この止めねじ3Aをねじ込むことで締め付けベルト2を締め付け状態で固定することができる。   In the next step, as shown in FIG. 3, the fastening band 2 is wound around the outside of the sealing material 1 to form a ring shape through the stopper 3, and after tightening the fastening band 2, the stopper 3 is fixed. . As the fastening band 2, a metal strip-shaped thin plate member can be used. The stopper 3 can be comprised with a flat metal cylindrical member. One end of the fastening band 2 is inserted and passed through the stopper 3 from one side, and then the tip is bent, and the other end of the fastening band 2 is inserted into the stopper 3 from the other side to form the fastening band 2 in a ring shape. To do. A tightening force is applied to the sealing material 1 by pulling the other end of the tightening band 2 as shown by the arrow in the figure. The stopper 3 is fixed in a state where a sufficient tightening force is applied. The stopper 3 is provided with a screw hole into which a set screw 3A is screwed. By tightening the set screw 3A, the tightening belt 2 can be fixed in a tightened state.

図示の例では、封止材1の接合箇所1Aの上にフランジ外周F1の曲率に合わせて湾曲させた金属板4を貼り付け、金属板4の上に止め具3を配置している。また、図示の例では、止め具3を2個連続して設けている。止め具3を2個設けることで、締め付け力に対しての締め付けバンド2の緩みを抑止することができる。また、金属板4を止め具3の下に敷くことで、封止材1を傷付けること無く、フランジ全周を均一に締め付けることができる。   In the example shown in the figure, a metal plate 4 that is curved in accordance with the curvature of the flange outer periphery F <b> 1 is attached on the joint 1 </ b> A of the sealing material 1, and the stopper 3 is disposed on the metal plate 4. In the illustrated example, two stoppers 3 are continuously provided. By providing two stoppers 3, loosening of the tightening band 2 with respect to the tightening force can be suppressed. Further, by laying the metal plate 4 under the stopper 3, the entire circumference of the flange can be uniformly tightened without damaging the sealing material 1.

次の工程では、修理対象のフランジ継手Fのボルト・ナットF3における漏洩を確認する。フランジ外周F1からの漏洩を封止材1と締め付けバンド2によって抑制した場合に、ボルト孔に漏洩が移行することが考えられるので、フランジ外周F1に封止材1を被せて締め付けバンド2で締め付けた後、ボルト・ナットF3の周囲に検漏液を塗り、ボルト孔で漏洩が生じているか否かを確認する。   In the next step, leakage in the bolt / nut F3 of the flange joint F to be repaired is confirmed. When leakage from the outer periphery F1 of the flange is suppressed by the sealing material 1 and the tightening band 2, the leakage may be transferred to the bolt hole, so that the sealing material 1 is put on the flange outer periphery F1 and tightened by the tightening band 2. After that, apply a leak detection liquid around the bolt and nut F3 to check whether or not there is a leak in the bolt hole.

漏洩が確認され、漏洩箇所が特定できた場合には、図4に示すように、漏洩が確認された箇所のボルト・ナットF3を取り外し、ボルト・ナットF3のボルト孔に修理用治具10を挿入する。   When leakage is confirmed and the leakage location can be identified, as shown in FIG. 4, the bolt / nut F3 at the location where leakage has been confirmed is removed, and the repair jig 10 is placed in the bolt hole of the bolt / nut F3. insert.

図5は、本発明の実施形態における修理用治具10の具体的な構成を示した説明図である(同図(a)が修理用治具10の側面図、同図(b)が修理用治具10の正面図を示している)。修理用治具10は、ボルト・ナットF3と同様に一対のフランジF2を締結する締結具の構成を有しており、ボルト孔に挿入されるねじ軸部11と、ねじ軸部11の一端側に固定又は螺合される第1ナット部12と、ねじ軸部12の他端側に螺合される第2ナット部13とを備えている。ねじ軸部11は全長に亘ってねじ溝11Aが設けられていると共に、ボルト孔に樹脂を充填させる樹脂注入溝11Bが軸方向に沿って設けられている。第2ナット部13には樹脂注入溝11Bに直接又はねじ軸部11のねじ溝11Aを介して連通する接続孔13Aが複数設けられている。そして、複数の接続孔13Aの一つに樹脂シール材注入器が接続され、接続孔13Aの残りの全ては栓14で塞がれている。   FIG. 5 is an explanatory view showing a specific configuration of the repair jig 10 in the embodiment of the present invention (FIG. 5A is a side view of the repair jig 10, and FIG. 5B is a repair). A front view of the jig 10 is shown). The repair jig 10 has a configuration of a fastener for fastening a pair of flanges F2 similarly to the bolt and nut F3, and includes a screw shaft portion 11 inserted into the bolt hole, and one end side of the screw shaft portion 11. A first nut portion 12 fixed or screwed to the screw shaft portion, and a second nut portion 13 screwed to the other end side of the screw shaft portion 12. The screw shaft portion 11 is provided with a screw groove 11A over its entire length, and a resin injection groove 11B for filling the bolt hole with resin along the axial direction. The second nut portion 13 is provided with a plurality of connection holes 13A communicating with the resin injection groove 11B directly or via the screw groove 11A of the screw shaft portion 11. A resin sealing material injector is connected to one of the plurality of connection holes 13A, and all the remaining connection holes 13A are closed with plugs 14.

図6は、修理用治具10を介してボルト孔に樹脂シール材を充填されている状態を示している。修理用治具10を漏洩が確認された箇所のねじ孔に装着し、第1ナット部12と第2ナット部13とを適度に締め付けた状態で、第2ナット部13の一つの接続孔13Aに樹脂シール材注入器20を接続する。樹脂シール材注入器20は、例えば、ホース21、第1バルブユニット22、圧力計ユニット23、第2バルブユニット24を介して接続することができる。   FIG. 6 shows a state in which the bolt hole is filled with the resin sealing material via the repair jig 10. The repair jig 10 is attached to the screw hole where leakage has been confirmed, and the first nut portion 12 and the second nut portion 13 are appropriately tightened, so that one connection hole 13A of the second nut portion 13 is provided. The resin sealing material injector 20 is connected to the above. The resin sealing material injector 20 can be connected via, for example, a hose 21, a first valve unit 22, a pressure gauge unit 23, and a second valve unit 24.

接続孔13Aの一つに樹脂シール材注入器20を接続して、他の接続孔13Aを栓14で塞いだ後に、樹脂シール材注入器20を操作して樹脂シール材の注入を開始する。この際、圧力計ユニット23の圧力計で注入圧力を確認しながら、第1ナット部12側から樹脂シール材が滲み出てきたら、第2バルブユニット24のバルブを閉めて、第1ナット部12と第2ナット部13を増締めする。そして、その後第2バルブユニット24を再度開き、樹脂シール材注入器20を操作して所定の充填圧力まで加圧注入を行う。樹脂シール材注入器20は、圧力計ユニット23での圧力が1.0mmPaを超えない範囲で使用するのが好ましい。充填圧力は、配管Pの輸送圧力に応じて0.3〜1.0MPaに設定することができる。   After connecting the resin seal material injector 20 to one of the connection holes 13A and closing the other connection holes 13A with the stoppers 14, the resin seal material injector 20 is operated to start injection of the resin seal material. At this time, while checking the injection pressure with the pressure gauge of the pressure gauge unit 23, if the resin seal material oozes out from the first nut portion 12 side, the valve of the second valve unit 24 is closed and the first nut portion 12 is closed. And tighten the second nut 13. Then, the second valve unit 24 is opened again, and the resin sealing material injector 20 is operated to perform pressure injection up to a predetermined filling pressure. The resin sealing material injector 20 is preferably used in a range where the pressure in the pressure gauge unit 23 does not exceed 1.0 mmPa. The filling pressure can be set to 0.3 to 1.0 MPa according to the transport pressure of the pipe P.

このような特徴を有する本発明の実施形態に係るフランジ継手の修理工法によると、様々な寸法を有するフランジ継手Fに対して、帯状の封止材1の両端を接合してリング状にし、その外側を締め付けバンド2で締め付けて固定するので、現場での対応で速やかにフランジ継手Fの漏洩を抑止することができる。そして、ボルト孔に漏洩が移行した場合は、ボルト・ナットF3を修理用治具10に差し替えてボルト孔に樹脂シール材を充填させることができるのでフランジ継手Fの漏洩を抑止することができる。また、バルブピット内などの狭隘部や他の配管などの既設構造物との離間距離が確保できない現場であっても円滑に施工を行うことが可能である。   According to the flange joint repair method according to the embodiment of the present invention having such characteristics, both ends of the strip-shaped sealing material 1 are joined to a flange joint F having various dimensions to form a ring shape. Since the outer side is fastened and fixed by the fastening band 2, the leakage of the flange joint F can be quickly suppressed by on-site correspondence. And when leakage shifts to the bolt hole, the bolt / nut F3 can be replaced with the repair jig 10 and the bolt hole can be filled with the resin sealant, so that leakage of the flange joint F can be suppressed. In addition, it is possible to perform the construction smoothly even at a site where it is not possible to secure a separation distance from an existing structure such as a narrow part in the valve pit or other piping or other piping.

更に、修理用治具10には、第2ナット部13に接続孔13Aが複数設けられているので、第2ナット部13を締め付けた場合に複数の接続孔13Aのうち接続し易いものに樹脂シール材注入器20を接続して、他の接続孔を栓14で塞ぐことができ、樹脂シール材注入時の作業性を向上させることができる。   Further, since the repair jig 10 is provided with a plurality of connection holes 13A in the second nut portion 13, when the second nut portion 13 is tightened, a resin that is easily connected among the plurality of connection holes 13A. The sealing material injector 20 is connected, and the other connection holes can be closed with the plugs 14, so that the workability at the time of injecting the resin sealing material can be improved.

なお、前述した説明では、フランジ継手において既に漏洩が発生している場合を例にして説明したが、これに限らず、未だ漏洩が発生していないが漏洩のリスクがある場合の修理にも本発明は適用することができる。   In the above description, the case where leakage has already occurred in the flange joint has been described as an example. However, the present invention is not limited to this, and the repair is also performed when leakage has not occurred yet but there is a risk of leakage. The invention can be applied.

1:封止材,1A:接合箇所,
2:締め付けバンド,3:止め具,3A:止めねじ,4:金属板,
10:修理用治具,
11:ねじ軸部,11A:ねじ溝,11B:樹脂注入溝,
12:第1ナット部,13:第2ナット部,13A:接続孔,14:栓,
20:樹脂シール材注入器20,21:ホース,22:第1バルブユニット,23:圧力計ユニット,24:第2バルブユニット,
F:フランジ継手,F1:フランジ外周,F2:フランジ,F3:ボルト・ナット,P:配管
1: Sealing material, 1A: Joint location,
2: Fastening band, 3: Stopper, 3A: Set screw, 4: Metal plate,
10: Repair jig,
11: Screw shaft portion, 11A: Screw groove, 11B: Resin injection groove,
12: 1st nut part, 13: 2nd nut part, 13A: Connection hole, 14: Stopper,
20: Resin sealing material injector 20, 21: Hose, 22: First valve unit, 23: Pressure gauge unit, 24: Second valve unit,
F: Flange joint, F1: Flange outer periphery, F2: Flange, F3: Bolt / nut, P: Piping

Claims (3)

帯状の封止材の両端を接合してリング状にする工程と、
リング状にした前記封止材をフランジ外周に被せる工程と、
締め付けバンドを前記封止材の外側に巻回して止め具を介してリング状にし、該締め付けバンドを締め付けた後、前記止め具を固定する工程と、
修理対象のフランジ継手のボルト・ナットにおける漏洩を確認する工程と、
漏洩が確認された箇所のボルト・ナットを取り外し、該ボルト・ナットのボルト孔に修理用治具を挿入する工程と、
前記修理用治具を介して前記ボルト孔に樹脂シール材を充填する工程とを有し、
前記修理用治具は、前記ボルト孔に挿入されるねじ軸部と、前記ねじ軸部の一端側に固定又は螺合される第1ナット部と、前記ねじ軸部の他端側に螺合される第2ナット部とを備え、前記ねじ軸部には前記ボルト孔に樹脂を充填させる樹脂注入溝が軸方向に沿って設けられ、前記第2ナット部には前記樹脂注入溝に直接又は前記ねじ軸部のねじ溝を介して連通する接続孔が複数設けられ、複数の前記接続孔の一つに樹脂シール材注入器を接続すると共に、前記接続孔の残りの全てを栓で塞ぐことを特徴とするフランジ継手の修理工法。
Joining both ends of the band-shaped sealing material to form a ring;
A step of covering the outer periphery of the flange with the ring-shaped sealing material;
Winding a fastening band around the outside of the sealing material to form a ring shape through a stopper, and fixing the stopper after tightening the fastening band;
A process of confirming leakage of bolts and nuts of flange joints to be repaired;
Removing bolts and nuts where leakage has been confirmed, and inserting a repair jig into the bolt holes of the bolts and nuts;
Filling the bolt hole with a resin sealant through the repair jig,
The repair jig includes a screw shaft portion inserted into the bolt hole, a first nut portion fixed or screwed to one end side of the screw shaft portion, and screwed to the other end side of the screw shaft portion. The screw shaft portion is provided with a resin injection groove for filling the bolt hole with resin along the axial direction, and the second nut portion is provided directly or directly on the resin injection groove. A plurality of connection holes communicating with the screw grooves of the screw shaft portion are provided, and a resin sealing material injector is connected to one of the plurality of connection holes, and all the remaining of the connection holes are closed with plugs. A flange joint repair method characterized by
前記封止材の接合箇所の上にフランジ外周の曲率に合わせて湾曲させた金属板を貼り付け、該金属板の上に前記止め具を配置したことを特徴とする請求項1記載のフランジ継手の修理工法。   The flange joint according to claim 1, wherein a metal plate curved in accordance with a curvature of the outer periphery of the flange is affixed on the joining portion of the sealing material, and the stopper is disposed on the metal plate. Repair method. フランジ継手のボルト孔に樹脂シール材を充填させるための修理用治具であって、
前記ボルト孔に挿入されるねじ軸部と、
前記ねじ軸部の一端側に固定又は螺合される第1ナット部と、
前記ねじ軸部の他端側に螺合される第2ナット部とを備え、
前記ねじ軸部には前記ボルト孔に樹脂を充填させる樹脂注入溝が軸方向に沿って設けられ、前記第2ナット部には前記樹脂注入溝に直接又は前記ねじ軸部のねじ溝を介して連通する接続孔が複数設けられ、
複数の前記接続孔の一つに樹脂シール材注入器が接続されると共に、前記接続孔の残りの全てが栓で塞がれることを特徴とする修理用治具。
A repair jig for filling a resin sealant into a bolt hole of a flange joint,
A screw shaft portion inserted into the bolt hole;
A first nut portion fixed or screwed to one end side of the screw shaft portion;
A second nut portion screwed into the other end side of the screw shaft portion,
The screw shaft portion is provided with a resin injection groove for filling the bolt hole with resin along the axial direction, and the second nut portion is provided directly in the resin injection groove or via the screw groove of the screw shaft portion. A plurality of connecting holes are provided,
A repair jig, wherein a resin sealing material injector is connected to one of the plurality of connection holes, and all the remaining of the connection holes are closed with plugs.
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