JPH0669574U - Cast iron pipe mechanical coupling - Google Patents

Abstract

(57)【要約】 【目的】 片締めの懸念の少ない鋳鉄管のメカニカル継
手の開発 【構成】 受口１、挿口３間でゴムリング２を押圧する
押輪４は、受口出口方向へ縮径する傾斜面４１を外周面
とする。受口フランジ１１内へ刻設した環状溝１２内へ
嵌入する固定リング５の底面は、逆勾配の傾斜面５１よ
りなる。受口フランジを貫通した複数の貫通孔１４へ固
定リングの上面５２を押圧する締め付けボルト６を螺合
している。 【効果】 締め付けボルトを捩じ込むと面接触する傾斜
面４１と５１とが押圧に伴って面上で楔作用を発生し、
全周に亘って均等に圧着して押輪位置を固定する。作業
の簡易化、能率向上、寸法公差の吸収など効果大であ
る。 (57) [Abstract] [Purpose] Development of a mechanical joint for cast iron pipes with less concern about single tightening [Structure] The push ring 4 that presses the rubber ring 2 between the socket 1 and the socket 3 contracts toward the socket outlet. The inclined surface 41 having a diameter is defined as the outer peripheral surface. The bottom surface of the fixing ring 5 that fits into the annular groove 12 formed in the receiving flange 11 is composed of an inclined surface 51 having a reverse slope. Tightening bolts 6 for pressing the upper surface 52 of the fixing ring are screwed into the plurality of through holes 14 penetrating the receiving flange. [Effect] When the tightening bolt is screwed in, the inclined surfaces 41 and 51, which come into surface contact with each other, generate a wedge action on the surface due to the pressing,
The position of the push ring is fixed by uniformly crimping the entire circumference. It is effective in simplifying work, improving efficiency, and absorbing dimensional tolerances.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

本考案は鋳鉄管のメカニカル継手に係る。 The present invention relates to a cast iron pipe mechanical joint.

【０００２】[0002]

【従来の技術】[Prior art]

地中に埋設し水道用などの管路を形成する管には幾つかの種類が数えられるが 、腐食性の地中の雰囲気に耐える耐食性を具え、かつ、管路を布設するための管 と管の継合が容易な管種として鋳鉄管、特に遠心力ダクタイル鋳鉄管が最も広く 適用されて、全国市町村における上水道管路用の主体を占めている。耐食性につ いてはダクタイル鋳鉄本来の材質的な特性に加え、外面に施す塗装が強力な保護 を発揮するのであるが、管同士の継合については受口内へ挿口を嵌入するという きわめて簡単な原理によって水密的に継合できるので、溶接などを必須の条件と する鋼管に比べて遥かに有利な条件である。鋳鉄管の継手方式としては押輪を使 用するメカニカル継手とプッシュオン方式に大別されるが、本考案はメカニカル 継手を対象とする改善である。 There are several types of pipes that are buried in the ground to form pipes for water supply, etc., but they have corrosion resistance to withstand the corrosive underground atmosphere and pipes for laying pipes. Cast iron pipes, especially centrifugal ductile cast iron pipes, are the most widely applied as the types of pipes that can be easily joined, and occupy the main body for water supply pipelines in municipalities nationwide. Regarding corrosion resistance, in addition to the original material characteristics of ductile cast iron, the coating applied to the outer surface exerts strong protection, but when joining pipes, it is extremely easy to insert the insertion port into the receiving port. Since it can be joined in a watertight manner according to the principle, it is a far more advantageous condition than a steel pipe that requires welding and the like as an essential condition. The joint system for cast iron pipes can be roughly classified into mechanical joints that use push rings and push-on systems. The present invention is an improvement targeting mechanical joints.

【０００３】 メカニカル継手はさらにＡ形、Ｋ形などの種類に分けられるが、一般的な形状 を図５に示す。すなわち、鋳鉄管の一端は受口１ａ、他端は挿口３ａからなり、 受口内へ挿口を嵌入するに当って両者の間に止水用のゴムリング２ａを挟み込み 、このゴムリング２ａの出口側面２１ａを押輪４ａによって管軸方向へ押圧して 水封作用を発揮させるために、押輪を鋳鉄管の受口フランジ１１ａとＴ頭ボルト １０１およびナット１０２によって締め付けるのである。この方式は溶接などの ように材料の溶融を伴わないで簡単に管の水封的な継合ができるから、鋳鉄管を 採用する有力な根拠となっている。Mechanical joints are further classified into types such as A type and K type, and a general shape is shown in FIG. That is, one end of the cast iron pipe is composed of the receiving port 1a and the other end is of the insertion port 3a. When the insertion port is fitted into the receiving port, a rubber ring 2a for stopping water is sandwiched between the two, and the rubber ring 2a In order to press the outlet side surface 21a in the pipe axial direction by the push ring 4a to exert a water-sealing action, the push ring is tightened by the socket flange 11a of the cast iron pipe, the T-head bolt 101 and the nut 102. This method is a strong basis for adopting cast iron pipes, because pipes can be easily joined in a water-sealed manner without melting the material such as welding.

【０００４】[0004]

【考案が解決しようとする課題】[Problems to be solved by the device]

メカニカル継手は以上に述べたような継合上の利点があるが、それは他の材質 の管種と比較してのことであり、なお、改善の余地がないわけではない。すなわ ち、押輪４ａを受口フランジ１１ａに締め付ける目的は、前述のように受口と挿 口間に挾在するゴムリングが十分に受口内部方向へ押圧されて、管路内から漏水 しないように水封を完全に保証することである。この目的からいえば、押輪はゴ ムリングを鋳鉄管の全周に亘って均等に圧着していることが必要である。いずれ か一方にだけ押圧力が偏ると、他の部分の水封作用が不十分となって漏水する可 能性が出てくることは否めない。ところが規定された鋳鉄管の多くの口径、たと えば口径５００mmの中口径管であれば、その締め付け用のＴ頭ボルトは、円周上 均等に分割して１４本と規定され、口径の大小に応じてその数に変動はあるが、 いずれにしても相当な本数に及ぶことに変りがない。このような多数のボルトを 全周に亘って均等になるように、いわゆるトルク管理を行なって締め付けていく ためには、相当高度に熟練した作業員が煩瑣な手仕事によって注意深く行なわな ければ、埋設後の管路でトラブルを引き起こす懸念がある。地面から溝状に掘り 下げた埋設箇所へ鋳鉄管を嵌め込み、残った狭隘な空間を利用して継合部の全周 に亘る締め付け箇所でＴ頭ボルトを挿し込み、ナットでほぼ均等に予備的に締結 し、その後片締めとならないように全数に亘って追い締めをしていく手順が必要 である。この作業はきわめて不自然な姿勢で微妙な調整をしていくので、熟練者 と言えども非能率な作業と肉体的な疲労が伴わざるを得ないという課題がある。 The mechanical joint has the above-mentioned joining advantages, but it is compared with other types of pipes, and there is room for improvement. That is, the purpose of tightening the push ring 4a to the receiving flange 11a is to prevent the rubber ring between the receiving opening and the insertion opening from being pressed sufficiently toward the inside of the receiving opening to prevent water leakage from the inside of the pipeline as described above. So to guarantee the water seal completely. For this purpose, the push ring needs to have the rubber ring uniformly crimped over the entire circumference of the cast iron pipe. It is undeniable that if the pressing force is biased to only one of them, the water sealing effect of the other parts will be insufficient and there will be a possibility of water leakage. However, if a cast iron pipe has a large number of diameters, for example, a medium diameter pipe with a diameter of 500 mm, the T-head bolts for tightening the bolt are specified to be evenly divided into 14 pieces on the circumference. Depending on the number, the number will change to a considerable number in any case. In order to tighten such a large number of bolts so that they are evenly distributed over the entire circumference by performing so-called torque control, it is necessary for a highly skilled worker to carefully perform the manual labor. There is a risk of causing trouble in the pipeline after burial. Insert the cast iron pipe into the buried part dug into the groove from the ground, and use the remaining narrow space to insert the T-head bolts at the tightening points around the entire circumference of the joint, and use the nuts to make an almost even preliminary work. It is necessary to have a procedure to fasten all of them so that they will not be partially tightened. Since this work involves making delicate adjustments with a very unnatural posture, there is a problem that even inexperienced workers must be accompanied by inefficient work and physical fatigue.

【０００５】 本考案は以上に述べた課題を解決するために、継合に際しては特に熟練を前提 とせず、初心者でも完璧な水封作用を保証する工事を簡単に実施できるメカニカ ル継手の提供を目的とする。In order to solve the above-mentioned problems, the present invention provides a mechanical joint that does not require special skill at the time of joining, and can easily perform construction that guarantees a perfect water-sealing action even for beginners. To aim.

【０００６】[0006]

【課題を解決するための手段】[Means for Solving the Problems]

本考案に係るメカニカル継手は、拡径した受口１と該受口１内へ止水用のゴム リングを介して嵌入する挿口３と、該ゴムリングを管軸方向へ押圧する押輪４よ りなる鋳鉄管の継手方式であり、押輪４は受口１の出口方向へ縮径する傾斜面４ １を外周面とする環状体よりなり、前記の受口のフランジ１１の内周面から刻設 した環状溝１２の中へ嵌入する固定リング５は、底面が前記の傾斜面４１と同角 度の逆傾斜面５１を内周面とする一つ割りの環状体よりなり、受口フランジ１１ の外周面１３から複数個穿孔した貫通孔１４へ固定リング５の上面５２を押圧す る締め付けボルト６を螺合したことによって前記の課題を解決した。 The mechanical joint according to the present invention comprises an expanded receiving port 1, an insertion port 3 which is fitted into the receiving port 1 through a rubber ring for stopping water, and a push ring 4 which pushes the rubber ring in the axial direction of the pipe. Is a joint system of cast iron pipes, and the push ring 4 is made of an annular body whose outer peripheral surface is an inclined surface 41 that is reduced in diameter toward the outlet of the receiving port 1, and is cut from the inner peripheral surface of the flange 11 of the receiving port. The fixing ring 5 fitted into the provided annular groove 12 is composed of a split annular body whose inner surface is a reverse inclined surface 51 having the same angle as the inclined surface 41 described above. The above problem is solved by screwing the fastening bolt 6 that presses the upper surface 52 of the fixing ring 5 from the outer peripheral surface 13 to the through hole 14 having a plurality of holes.

【０００７】 また、その構成において、挿口３の外周面に１条の凹溝３１を刻設し、押輪４ の底面に該凹溝３１へ嵌入する突条４２を突設したことや、締め付けボルト６に 換えて、受口内の環状溝１２へ嵌入した固定リング５が溝底１５との間で形成す る中空部へゴムチューブ７とその内部へ圧入した超速硬性樹脂７１などを充填し たこともきわめて好ましい実施の態様である。In addition, in that structure, one groove 31 is formed on the outer peripheral surface of the insertion opening 3, and a protrusion 42 that fits into the groove 31 is formed on the bottom surface of the push ring 4 and is tightened. Instead of the bolt 6, the hollow portion formed between the fixing ring 5 fitted into the annular groove 12 in the receiving opening and the groove bottom 15 was filled with the rubber tube 7 and the ultra-rapid hardened resin 71 press-fit into the hollow tube. This is also a very preferable embodiment.

【０００８】[0008]

【作用】[Action]

受口内へ嵌入する挿口の外周面上へ押輪を嵌め込み、押輪の挿口端部方向に接 してゴムリングも嵌め込む。受口フランジ内の環状溝には固定リング５を嵌め込 み、この状態で受口内へ挿口を嵌入する。受口の内径、挿口の外径間で形成する 中空部内へゴムリングと押輪が位置するように両管を継合する。受口の外部から 管軸方向に向かって別の駆動力をかけて押輪を内部へ押し込むと、この押輪と面 接触しているゴムリングが両管の継合部の最深部まで押し込まれ、パッキングと して機能するように位置決めする。次に受口の外周面から環状溝まで貫通してい る複数の貫通孔から締め付けボルトを捩じ込むと、締め付けボルトの押圧力は固 定リング５の上面へ加わり、さらに底面である傾斜面へ伝わる。固定リング５底 部の傾斜面５１は押輪傾斜面４１と面接触した状態で係合しているから、結局、 締め付けボルトを回動することによって固定リング５へは楔を打ち込むのと同様 の作用がかかってその位置で強く拘束する作用が発揮される。この作用は複数の 締め付けボルトの何れの箇所においても発生するが、固定リング５と押輪とは全 面的に一定の傾斜面で係合し、上から加わる押圧力を面全体で等しく受けるから 、部分的な片締めの懸念がなく締め付けの弱い方へ摺動して均等な面圧着状態と なる。複数の締め付けボルトの数は従来に比べて小数で足り、実施上では従来の 半数で完全な継合状態を得ることができる。 Insert the push ring onto the outer peripheral surface of the insertion slot that will be inserted into the receiving slot, and insert the rubber ring so that it touches the end of the push ring. The fixing ring 5 is fitted in the annular groove in the receiving flange, and in this state, the inserting opening is fitted. Join both pipes so that the rubber ring and push ring are located in the hollow part formed between the inner diameter of the receiving port and the outer diameter of the insertion port. When the push ring is pushed inward by applying another driving force in the pipe axial direction from the outside of the receiving port, the rubber ring in surface contact with the push ring is pushed to the deepest part of the joint part of both pipes, and packing is performed. And position it so that it works. Next, when the tightening bolts are screwed in through the through holes that extend from the outer peripheral surface of the receiving port to the annular groove, the pressing force of the tightening bolts is applied to the upper surface of the fixing ring 5 and to the inclined surface that is the bottom surface. It is transmitted. Since the inclined surface 51 at the bottom of the fixing ring 5 is engaged with the pushing wheel inclined surface 41 in a state of surface contact, in the end, the same action as driving a wedge into the fixing ring 5 by rotating the tightening bolt. It exerts a strong force to restrain at that position. This action occurs at any position of the plurality of tightening bolts, but since the fixing ring 5 and the pressing ring are engaged with each other on a constant inclined surface, the pressing force applied from above is equally received on the entire surface. There is no concern of partial partial tightening, and the surface is evenly crimped by sliding to the weaker side. The number of the plurality of tightening bolts is smaller than the conventional number, and in practice, half of the conventional bolts can achieve a completely joined state.

【０００９】[0009]

【実施例】 図１は本考案の実施例を示す縦断正面図である。図において、ダクタイル鋳鉄 を材質とする遠心力鋳鉄管の両端部はそれぞれ受口１、挿口３よりなり、受口１ 内の最深部にはゴムリング２を圧入している。ゴムリングの圧入は、あらかじめ 挿口３の所定の位置へ押輪４とゴムリング２を嵌め込み、この上へ被せるように 受口を外嵌し、別に用意した油圧ジャッキ（図示せず）により押輪の外側面４４ から一定の圧力Ｐで管軸方向へ押圧する手順が合理的である。この結果、ゴムリ ング２の受口の出口側面２１には押輪４の押圧面４３が面接触して全面でゴムリ ングを内部へ向けて押圧しゴムリングの水封作用を確保している。受口フランジ １１内の環状溝１２へは、挿口３を嵌入する前にあらかじめ固定リング５を嵌入 して受口内へ挿口を嵌入するときに妨げとならないように溝底近くへ退入させて おく。挿口の嵌入が終れば、受口フランジ１１から穿孔した貫通孔１４を挿通し た締め付けボルト６を捩じこみ、その先端が固定リング５の上面５２へ当接した 後にさらに締め付けることによって固定リング５を下方へ押し込み、固定リング ５は傾斜面４１と５１で相互に接触している押輪４を押圧し、締め付けボルトの 捩じ込みとともに傾斜面における楔作用がさらに強化されて押輪の位置を不動と なるように拘束する。Embodiment FIG. 1 is a vertical sectional front view showing an embodiment of the present invention. In the figure, both ends of a centrifugal cast iron pipe made of ductile cast iron have a receiving port 1 and an inserting port 3, respectively, and a rubber ring 2 is press-fitted into the deepest portion of the receiving port 1. To press-fit the rubber ring, insert the push ring 4 and the rubber ring 2 into the predetermined position of the insertion port 3 in advance, fit the receiving port over the cover, and use a hydraulic jack (not shown) to prepare the push ring. It is rational to press the outer surface 44 with a constant pressure P in the axial direction of the pipe. As a result, the pressing surface 43 of the pressing wheel 4 comes into surface contact with the outlet side surface 21 of the receiving port of the rubber ring 2 and presses the rubber ring inwardly on the entire surface to secure the water sealing action of the rubber ring. Before inserting the insertion opening 3, insert the fixing ring 5 into the annular groove 12 in the receiving flange 11 and retract it near the groove bottom so as not to obstruct the insertion of the insertion opening into the receiving opening. Save. After the insertion of the insertion hole is completed, the tightening bolt 6 inserted through the through hole 14 drilled from the receiving flange 11 is screwed into the fixing ring 5, and the tip of the tightening bolt 6 is brought into contact with the upper surface 52 of the fixing ring 5, and is further tightened. 5 is pushed downward, and the fixing ring 5 presses the push wheel 4 which is in contact with each other at the inclined surfaces 41 and 51, and the wedge action on the inclined surface is further strengthened as the tightening bolt is screwed in, and the position of the push wheel is fixed. Restrain so that

【００１０】 図２は本考案の別の実施例を示した縦断正面図であり、押輪４の底部に突条４ ２を設け、一方、挿口３には継合後の対応する位置に全周に亘って凹溝３１を刻 設して、管継合時にはあらかじめ凹溝３１へ突条４２を嵌合し、押輪の位置を保 持して管の抜け出すことを完全に防止する作用を追加する。FIG. 2 is a vertical cross-sectional front view showing another embodiment of the present invention, in which a ridge 42 is provided on the bottom of the push ring 4, while the insertion slot 3 is at the corresponding position after joining. A groove 31 is engraved along the circumference, and when the pipes are joined together, the projection 42 is fitted into the groove 31 in advance to add a function of holding the position of the push ring and completely preventing the pipe from coming out. To do.

【００１１】 図３は本考案のさらに別の実施例を示す縦断正面図であり、締め付けボルト６ を使用しないでゴムリングを押圧する押輪の位置を一定に拘束する例である。こ の場合には受口フランジ１１から環状溝１２へ貫通する貫通孔１４は二箇所でよ い。すなわち、ゴムチューブ７を環状溝１２内へ嵌入してその両端を貫通孔１４ からそれぞれ外へ引き出しておく。ゴムチューブ７の上へ固定リング５を嵌め込 み、この状態で挿口を外嵌する。押輪を水平方向から押圧してゴムリングの位置 が決った後、外へ引き出されたゴムチューブの一方を閉じ、他端から超速硬性の 樹脂、たとえば硬質ポリエステル、または超速硬性のセメントモルタルを圧入し 、凝固した後に管体から飛び出した余分のゴムチューブを内部の充填材とともに 切り取り除去する。FIG. 3 is a vertical sectional front view showing still another embodiment of the present invention, which is an example in which the position of the push ring for pressing the rubber ring is constrained to a constant value without using the tightening bolt 6. In this case, the number of through holes 14 penetrating from the receiving flange 11 to the annular groove 12 may be two. That is, the rubber tube 7 is fitted into the annular groove 12 and both ends thereof are pulled out from the through holes 14 respectively. The fixing ring 5 is fitted onto the rubber tube 7, and the insertion opening is fitted outside in this state. After pressing the push ring from the horizontal direction to determine the position of the rubber ring, close one of the rubber tubes that has been pulled out, and press-in a super fast setting resin such as hard polyester or super fast setting cement mortar from the other end. After the solidification, the excess rubber tube that popped out of the pipe body is cut out and removed together with the filling material inside.

【００１２】[0012]

【考案の効果】[Effect of device]

本考案は以上に述べたとおり従来技術のような多数の取り付けボルトの片締め を配慮することなく、いわゆるトルク管理の必要性がない。継合の作業は特に経 験の豊富な作業員に限られることなく、初心者でも自動的に正確で信頼性の高い 継合作業ができるので現場的な効果が大きい。また、従来技術に比べると締め付 け用のボルトの数が少なくて済みほぼ半減できるから、その点からも作業性は大 幅の向上を見ることができる。 As described above, the present invention does not require so-called torque management, which does not require a single tightening of a large number of mounting bolts as in the prior art. The splicing work is not limited to workers with abundant experience, and even beginners can automatically perform accurate and reliable splicing work, which is highly effective in the field. In addition, the number of tightening bolts is small compared to the conventional technology, and the bolts can be halved, so that workability can be greatly improved.

【００１３】 また、一般的に鋳鉄管は受口の内径、挿口の外径を含め寸法的な許容誤差が認 められ、その範囲内で検査の合否を定めている。このため図５に例示した従来技 術では、押輪の水平（管軸）方向への押し込みについても、寸法誤差による変動 を考慮して押輪の移動量を調整しなければ、ゴムリングの水封能力にもばらつき が生じて好ましくない継合状態となる懸念がある。この点に関しても本考案では 好ましい効果を維持している。すなわち図４（Ａ）（Ｂ）に示すように同一の押 圧力で水平に押輪４を押し込んだとき、受挿許容差の最小のときには図（Ａ）に 見られるように、また、受挿許容差が最大のときには図（Ｂ）に見られるように 、それぞれ押輪が固定リング５との傾斜面に沿って摺動し変動を吸収するから、 寸法誤差による変動を考慮せず自動的に作業を行なえば、そのまま適正な継合関 係が成立しているという利点も看過できない効果である。In general, cast iron pipes have dimensional tolerances including the inner diameter of the receiving port and the outer diameter of the insertion port, and the pass / fail of the inspection is determined within this range. For this reason, in the conventional technique illustrated in FIG. 5, even when the push ring is pushed in the horizontal (pipe axis) direction, if the movement amount of the push ring is not adjusted in consideration of the variation due to dimensional error, the water sealing capacity of the rubber ring is reduced. However, there is a concern that variations will occur and undesired splicing will occur. With respect to this point as well, the present invention maintains a preferable effect. That is, as shown in FIGS. 4 (A) and 4 (B), when the push wheel 4 is pushed horizontally with the same pressing force, when the insertion tolerance is the minimum, as shown in FIG. When the difference is maximum, as shown in Figure (B), the push ring slides along the inclined surface of the fixed ring 5 and absorbs the fluctuations, so the work is automatically performed without considering the fluctuations due to dimensional errors. If this is done, the advantage that a proper splicing relationship is established as it is is an effect that cannot be overlooked.

【図面の簡単な説明】[Brief description of drawings]

【図１】本考案実施例の縦断正面図である。FIG. 1 is a vertical sectional front view of an embodiment of the present invention.

【図２】別の実施例の縦断正面図である。FIG. 2 is a vertical sectional front view of another embodiment.

【図３】さらに別の実施例を示す縦断正面図である。FIG. 3 is a vertical sectional front view showing still another embodiment.

【図４】（Ａ）（Ｂ）によって本考案の効果の一つを示
す縦断正面図である。FIG. 4 is a vertical sectional front view showing one of the effects of the present invention by (A) and (B).

【図５】従来技術を示す縦断正面図である。FIG. 5 is a vertical sectional front view showing a conventional technique.

【符号の説明】[Explanation of symbols]

１ 受口 ２ ゴムリング ３ 挿口 ４ 押輪 ５ 固定リング ６ 締め付けボルト ７ ゴムチューブ 11 受口フランジ 12 環状溝 13 外周面 14 貫通孔 15 溝底 21 出口側面 31 凹溝 41 傾斜面 42 突条 43 押圧面 44 外側面 51 傾斜面 52 上面 71 超速硬性樹脂 1 Receptacle 2 Rubber ring 3 Insertion port 4 Push ring 5 Fixing ring 6 Tightening bolt 7 Rubber tube 11 Receptacle flange 12 Annular groove 13 Outer peripheral surface 14 Through hole 15 Groove bottom 21 Outlet side surface 31 Recessed groove 41 Inclined surface 42 Projection 43 Pressing Surface 44 Outer surface 51 Inclined surface 52 Upper surface 71 Super fast hardening resin

Claims (3)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】 拡径した受口１と該受口１内へ止水用の
ゴムリング２を介して嵌入する挿口３と、該ゴムリング
２を管軸方向へ押圧する押輪４よりなる鋳鉄管のメカニ
カル継手において、押輪４は受口１の出口方向へ縮径す
る傾斜面４１を外周面とする環状体よりなり、前記受口
１のフランジ１１の内周面から刻設した環状溝１２の中
へ嵌入する固定リング５は、底面が前記の傾斜面４１と
同角度の逆傾斜面５１とする一つ割りの環状体よりな
り、受口フランジ１１の外周面１３から複数個穿孔した
貫通孔１４へ固定リング５の上面５２を押圧する締め付
けボルト６を螺合したことを特徴とする鋳鉄管のメカニ
カル継手。1. A reception port 1 having an enlarged diameter, an insertion port 3 which is fitted into the reception port 1 through a rubber ring 2 for stopping water, and a push ring 4 which presses the rubber ring 2 in the tube axial direction. In the mechanical coupling of a cast iron pipe, the push ring 4 is an annular body having an outer peripheral surface of an inclined surface 41 that reduces in diameter toward the outlet of the receiving port 1, and an annular groove formed from the inner peripheral surface of the flange 11 of the receiving port 1. The fixing ring 5 to be fitted in 12 is made of a split annular body whose bottom surface is the reverse inclined surface 51 at the same angle as the aforementioned inclined surface 41, and a plurality of holes are drilled from the outer peripheral surface 13 of the receiving flange 11. A mechanical joint for a cast iron pipe, characterized in that a tightening bolt 6 for pressing an upper surface 52 of the fixing ring 5 is screwed into the through hole 14. 【請求項２】 請求項１において、挿口３の外周面に１
条の凹溝３１を刻設し、押輪４の底面に該凹溝３１内へ
嵌入する突条４２を突設したことを特徴とする鋳鉄管の
メカニカル継手。2. The outer peripheral surface of the insertion slot 3 according to claim 1,
A mechanical joint for a cast iron pipe, characterized in that a grooved groove 31 is formed in a groove, and a ridge 42 that fits into the grooved groove 31 is provided on the bottom surface of the push ring 4. 【請求項３】 請求項１または２において締め付けボル
ト６に代えて、受口フランジ内の環状溝１２へ嵌入した
固定リング５が溝底１５との間で形成する中空部へ、ゴ
ムチューブ７とその内部へ圧入した超速硬性樹脂７１な
どを充填したことを特徴とする鋳鉄管のメカニカル継
手。3. The hollow tube formed between the fixing ring 5 fitted in the annular groove 12 in the receiving flange and the groove bottom 15 in place of the tightening bolt 6 in claim 1 or 2, and the rubber tube 7 and A mechanical joint for cast iron pipe, characterized in that it is filled with ultra-rapid hardening resin 71 and the like that is press-fitted inside.