JP7232641B2 - HYDRAULIC PRESSURE TESTING DEVICE AND HYDRAULIC TESTING METHOD FOR PIPE JOINT - Google Patents

HYDRAULIC PRESSURE TESTING DEVICE AND HYDRAULIC TESTING METHOD FOR PIPE JOINT Download PDF

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JP7232641B2
JP7232641B2 JP2018239907A JP2018239907A JP7232641B2 JP 7232641 B2 JP7232641 B2 JP 7232641B2 JP 2018239907 A JP2018239907 A JP 2018239907A JP 2018239907 A JP2018239907 A JP 2018239907A JP 7232641 B2 JP7232641 B2 JP 7232641B2
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water
stop ring
socket
insertion port
water stop
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JP2020101449A (en
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弘司 藤田
正純 小仲
義徳 吉田
直岐 冨田
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Kurimoto Ltd
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Description

この発明は、一の鋳鉄管の受口内に他の鋳鉄管の挿し口が挿入された管継手の水圧試験装置及び水圧試験方法に関するものである。 TECHNICAL FIELD The present invention relates to a hydraulic test apparatus and a hydraulic test method for a pipe joint in which a spigot of another cast iron pipe is inserted into a socket of one cast iron pipe.

例えば、ダクタイル鋳鉄管で管路を構築するには、一の鋳鉄管の受口内に他の鋳鉄管の挿し口を挿入するとともに、前記受口の内周面と挿し口の外周面との間の円環状空間にゴム輪を介在した構造が一般的である（本願図１、図４等参照）。
この管路を構築した際、その挿し口を受口に挿し入れた継手部（止水部）は、その健全性を確認するため、継手に水圧を負荷する試験（水圧試験）が実施される。 For example, in order to construct a pipeline with ductile cast iron pipes, a spigot of another cast iron pipe is inserted into the socket of one cast iron pipe, and between the inner peripheral surface of the socket and the outer peripheral surface of the spigot A structure in which a rubber ring is interposed in the annular space of is generally used (see FIGS. 1 and 4 of the present application).
When constructing this pipeline, a test (hydraulic pressure test) is carried out by applying water pressure to the joint part (water stop part) where the insertion port is inserted into the socket in order to confirm the soundness of the joint part. .

その水圧の負荷方法としては、例えば、呼び径：９００未満の小径継手の場合、管路に水を充満させて（充水させて）継手に水圧を負荷する方法がとられている。一方、呼び径：９００以上の管路は作業員が管内に入れることから、テストバンドを管内面から継手部に押さえ付けて、継手毎に水圧を負荷する試験が実施されることが多い（特許文献１参照）。このテストバンドを使用する場合、試験水圧は０．５ＭＰａとすることが一般的である。 As a method for applying water pressure, for example, in the case of a small diameter joint having a nominal diameter of less than 900, a method of filling the pipe line with water and applying water pressure to the joint is adopted. On the other hand, for pipes with a nominal diameter of 900 or more, since workers enter the pipe, a test band is often pressed against the joint from the inner surface of the pipe to apply water pressure to each joint (Patent Reference 1). When using this test band, the test water pressure is generally set to 0.5 MPa.

また、挿し口先端面と受口奥端面との間にチューブを介設し、そのチューブに水を注入してチューブを前記挿し口先端面と受口奥端面とに圧着して（密に接しさせて）その両面間を閉塞し、受口の内周面と挿し口の外周面との間の円環状空間をチューブとゴム輪とによって密封し、その密封空間に水を注入して水圧をかける水圧試験も実施されている（特許文献２第１図、第２図参照）。 In addition, a tube is interposed between the tip surface of the spigot and the inner end surface of the socket, water is injected into the tube, and the tube is crimped (closely contacted) with the tip surface of the insert opening and the inner end surface of the socket. The space between the two surfaces is closed, the annular space between the inner peripheral surface of the socket and the outer peripheral surface of the insertion port is sealed with a tube and a rubber ring, and water is injected into the sealed space to reduce water pressure. A water pressure test has also been carried out (see Patent Document 2, Figs. 1 and 2).

実開昭５５－１４７６４３号公報Japanese Utility Model Laid-Open No. 55-147643 実開昭５６－４８０４１号公報Japanese Utility Model Laid-Open No. 56-48041

管路に水を充満させる水圧試験は、呼び径が大きい管路においては大量の水を必要とすることから、採用しづらい。
テストバンドによる水圧試験は、管の内面から半径方向外側に向かってテストバンドを押さえる構造であり（特許文献１図面参照）、直管と異形管との継手部は、接合する管の挿し口内面と受口内面との内径の相違からその間に段差が生じ易いため、テストバンドでその挿し口内面と受口内面とをうまく押さえられない場合が生じている。
また、チューブによる水圧は、テストバンドの水圧試験に比べれば、その構成が簡単であり、装置も小型とし得るが、チューブ内への水注入によって密封するため、その密封が十分に行われない場合が多い。 A water pressure test in which a pipeline is filled with water is difficult to adopt because it requires a large amount of water in a pipeline with a large nominal diameter.
The water pressure test using a test band has a structure that presses the test band radially outward from the inner surface of the pipe (see the drawing of Patent Document 1). Because of the difference in the inner diameter between the test band and the inner surface of the receptacle, there is a tendency for a step to occur therebetween.
In addition, the water pressure test using a tube has a simpler configuration than the water pressure test using a test band, and the device can be made small. There are many.

この発明は、以上の実状の下、チューブによる水圧試験の欠点を改善することを課題とする。 SUMMARY OF THE INVENTION Under the above circumstances, an object of the present invention is to improve the drawbacks of the hydraulic test using a tube.

管継手には、挿し口が受口に対して所要長さ移動し得る（出し入れし得る）Ｋ形、Ｔ形、ＵＳ（Ｒ方式）形、ＰＩＩ形等があり、これらの管継手は、管継手を構成した所定の位置では、挿し口を受口内に挿し込んで、挿し口先端面と受口の奥端面とを接近（近接）させる構造である。
この発明は、その構造における挿し口先端面と受口の奥端面とを接近させる点に着目し、上記課題を達成するため、前記挿し口先端面と受口の奥端面との間を閉塞する止水リングを挿し口先端面と受口の奥端面との間に介在するとともに、その止水リングを介在して挿し口を受口に挿し入れ、挿し口先端面と受口の奥端面との間に止水リングを密に接しさせて上記円環状空間を密封して、その空間に水を注入して水圧試験を行うようにしたのである。
このようにすれば、挿し口の挿し込み力で密封性が担保されるため、その密封性も確実であり、大がかりな装置も必要はない。 Pipe joints include K type, T type, US (R method) type, PII type, etc., in which the spigot can be moved (inserted and withdrawn) from the socket by a required length. At a predetermined position where the joint is configured, the spigot is inserted into the receptacle, and the distal end face of the receptacle and the inner end face of the receptacle are brought closer (approach).
In order to achieve the above object, the present invention pays attention to the fact that the front end surface of the receptacle and the rear end surface of the receptacle are brought close to each other in the structure, and closes the space between the front end surface of the insertion receptacle and the rear end surface of the receptacle. A water stop ring is interposed between the tip surface of the insertion port and the inner end surface of the socket, and the insertion port is inserted into the socket with the water stop ring interposed therebetween, so that the tip end surface of the insertion port and the inner end surface of the socket are separated. A water cut-off ring is brought into close contact with the space between them to seal the annular space, and water is injected into the space to conduct a water pressure test.
In this way, since the sealing performance is ensured by the insertion force of the insertion port, the sealing performance is also assured, and a large-scale device is not required.

この発明に係る管継手の水圧試験装置の具体的な構成としては、一の鋳鉄管の受口内に他の鋳鉄管の挿し口が挿入されているとともに、受口の内周面と挿し口の外周面との間の円環状空間にゴム輪が介在されて、挿し口先端面と受口の奥端面とを近接し得る管継手において、前記挿し口先端面と前記受口の奥端面との間の全周に介設される止水リングと、その止水リング又は挿し口にその内側から円環状空間に貫通する充水加圧・空気抜き孔と、を有し、前記止水リングは、その円環部分が前記充水加圧・空気抜き孔を有する場合その充水加圧・空気抜き孔を除いて中身の詰まった断面を有する弾性材からなり、前記充水加圧・空気抜き孔が前記挿し口にある場合はその円環部分全周が中身の詰まった断面を有する弾性材からなって、挿し口を受口に挿し込むことによって、挿し口先端面と受口の奥端面との間に密着しており、その密着した状態で充水加圧・空気抜き孔から水を注入して、円環状空間内に充水して水圧試験を行う構成を採用することができる。 As a specific configuration of the hydraulic pressure test apparatus for pipe joints according to the present invention, an insertion port for another cast iron pipe is inserted into the socket of one cast iron pipe, and the inner peripheral surface of the socket and the insertion port In a pipe joint in which a rubber ring is interposed in an annular space between the outer peripheral surface and the tip end surface of the insertion port and the inner end surface of the socket can be brought close to each other, the tip end surface of the insertion port and the inner end surface of the socket A water stop ring interposed on the entire circumference of the water stop ring and a water filling pressurization / air vent hole penetrating from the inner side of the water stop ring or the insertion port into the annular space, the water stop ring When the annular portion has the water filling/pressurizing/air venting hole, it is made of an elastic material having a solid cross section except for the water filling/pressurizing/air venting hole, and the water filling/pressurizing/air venting hole is inserted into the insert. When it is in the mouth, the entire circumference of the annular portion is made of an elastic material having a solid cross section, and by inserting the spigot into the receptacle, a gap between the front end face of the receptacle and the inner end face of the receptacle It is possible to employ a configuration in which the water pressure test is performed by injecting water from the water filling pressurization/air vent hole in the tight state to fill the annular space with water.

この構成において、上記止水リングの円環状空間側に挿し口先端部外周面に接する脱落防止用鍔を設ければ、挿し口の先端に止水リングを取り付けて挿し口を受口に挿し込む際、挿し口から止水リングが外れることが防止されるため、その挿し入れを円滑に行うことができる。また、水圧負荷時、止水リングが水圧によって管の内面側に押し出される力が生じても、脱落防止用鍔が挿し口の外周面に当接することによって止水リングに対する前記押し出し力に抗する。
脱落防止用鍔は止水リングの全周に設けることが好ましい。脱落防止用鍔が全周にあれば、止水リングを挿し口先端部に嵌めることができてその取り付け状態が安定する。また、水圧負荷時、止水リングが水圧によって管の内面側に押し出される力が生じても、脱落防止用鍔の一部が挿し口先端面と受口奥端面の間に入り込んでセルフシール効果を発揮する。このため、管軸方向の圧縮力（挿し込み力）を増加しなくても高水圧の試験水を負荷できる。 In this configuration, if a detachment prevention collar is provided on the annular space side of the water stop ring to contact the outer peripheral surface of the tip of the spigot, the water stop ring is attached to the tip of the spigot and the spigot is inserted into the receptacle. Since the water stop ring is prevented from coming off from the insertion opening, the insertion can be performed smoothly. Further, even when the water pressure is applied, even if the water pressure causes the water stop ring to be pushed out toward the inner surface of the pipe, the drop-off prevention collar contacts the outer peripheral surface of the insertion port to resist the pushing force against the water stop ring. .
It is preferable that the drop-off preventing collar is provided on the entire circumference of the water stop ring. If the drop-off prevention collar is provided on the entire circumference, the water stop ring can be fitted to the tip of the insertion port, and the mounting state is stabilized. When water pressure is applied, even if the water pressure causes the water stop ring to be pushed out toward the inner surface of the pipe, part of the drop-off prevention collar will enter between the tip surface of the insertion port and the inner surface of the socket, resulting in a self-sealing effect. demonstrate. For this reason, high-pressure test water can be loaded without increasing the compressive force (insertion force) in the direction of the tube axis.

また、上記止水リングの挿し口先端面と受口の奥端面側の少なくも一方全周に突条を設けることができる。このようにすれば、突条に押圧力が集中するため、止水リングと挿し口先端面と受口奥端面との面圧が高くなって止水性が向上する。この面圧が高くなることは、管軸方向の圧縮力（挿し込み力）を小さくすることができる。 Further, a ridge may be provided on at least one of the front end face of the insertion port of the water stop ring and the inner end face of the receptacle. In this way, since the pressing force is concentrated on the ridges, the contact pressure between the water stop ring, the front end face of the insertion port, and the inner end face of the receptacle increases, thereby improving water stoppage. The increased surface pressure can reduce the compressive force (insertion force) in the direction of the tube axis.

上記充水加圧・空気抜き孔は別々の位置に形成する。その両孔は挿し口又は止水リングの中心に対して対称位置、好ましくは、充水・加圧孔は最下側、空気抜き孔は最上側とする。
また、充水加圧・空気抜き孔を挿し口に形成すれば、止水リングに充水加圧・空気抜き孔を形成しないため、構造が簡単となり、止水リングの厚み等を考慮する必要がない等の製作性が向上する。 The water filling pressurization and air vent holes are formed at separate positions. Both holes are positioned symmetrically with respect to the center of the insertion port or water stop ring. Preferably, the water filling/pressurizing hole is on the lowermost side and the air vent hole is on the uppermost side.
In addition, if a water filling pressurization and air vent hole is formed in the insertion port, the water stop ring does not have a water filling pressurization and air vent hole, so the structure is simple and there is no need to consider the thickness of the water stop ring. etc. is improved.

上記止水リングの内側全周に円環状のサポートを設ければ、水圧によって止水リングが管内面側に逸脱することを防げる。また、円環状のサポートを挿し口先端面と受口奥端面に挟む大きさとすれば、止水リングが挿し口に不動となって、挿し口先端面と受口の奥端面との間からの止水リングの逸脱が防止されると共に、水圧負荷によって、止水リングの挿し口先端面と受口の奥端面に対する面圧が増加してセルフシール効果を期待することができる。 If an annular support is provided around the inner periphery of the water stop ring, it is possible to prevent the water stop ring from deviating toward the inner surface of the pipe due to water pressure. In addition, if the ring-shaped support is sized to be sandwiched between the tip end face of the spigot and the inner end face of the socket, the water stop ring will not move around the spigot, and water will not flow from between the tip end face of the spigot and the inner end face of the socket. The water stop ring is prevented from deviating, and the water pressure load increases the surface pressure of the water stop ring against the front end surface of the insertion port and the inner end surface of the socket, so that a self-sealing effect can be expected.

この発明に係る管継手の水圧試験方法の具体的な構成としては、一の鋳鉄管の受口内に他の鋳鉄管の挿し口が挿入されているとともに、前記受口の内周面と挿し口の外周面との間の円環状空間にゴム輪が介在されて、前記挿し口先端面と受口の奥端面とを近接し得る管継手において、前記挿し口先端面と受口の奥端面との間の全周に止水リングを介在し、その止水リングは、円環部分が後記充水加圧・空気抜き孔を有する場合はその充水加圧・空気抜き孔を除いて中身の詰まった断面を有する弾性材からなり、前記充水加圧・空気抜き孔が前記挿し口にある場合はその円環部分全周が中身の詰まった断面を有する弾性材からなって、挿し口をさらに差し込んでその挿し口先端面と受口奥端面に止水リングを密着し（密に接しさせ）、止水リング又は挿し口の内側から円環状空間に貫通する前記充水加圧・空気抜き孔を介し水を注入して、前記円環状空間内に充水して水圧試験を行う構成を採用することができる。 As a specific configuration of the hydraulic pressure test method for pipe joints according to the present invention, a spigot of another cast iron pipe is inserted into the socket of one cast iron pipe, and the inner peripheral surface of the socket and the spigot In a pipe joint in which a rubber ring is interposed in an annular space between the outer peripheral surface of the insertion opening and the inner end surface of the socket, the insertion opening front end surface and the inner end surface of the socket can be brought close to each other. A water stop ring is interposed on the entire circumference between the It is made of an elastic material having a cross section, and when the water filling pressurization/air vent hole is in the insertion port, the entire circumference of the annular portion is made of an elastic material having a solid cross section, and the insertion port is further inserted. A water stop ring is adhered to the tip end face of the spigot and the back end face of the receptacle (closely contacted), and water is injected through the water filling pressurization/air vent hole penetrating from the inside of the water stop ring or the spigot into the annular space. can be used to fill the annular space with water and perform a hydraulic pressure test.

この構成において、上記止水リングの円環状空間に挿し口先端部外周面に接する脱落防止用鍔を設けたり、
上記止水リングの円環状空間側に挿し口先端部外周面に接する脱落防止用鍔を設けたり、
その脱落防止用鍔が止水リングの全周に設けられてその鍔によって止水リングが挿し口先端部外周面に嵌っている構成としたり、
上記止水リングの挿し口先端面と受口の奥端面側の少なくも一方全周に突条を設けたり、
することができる。
また、上記止水リングの内側全周に円環状のサポートを設けたりすることもできて、同様に、上記作用効果を得ることができる。 In this configuration, a flange for preventing falling off is provided in the annular space of the water stop ring and is in contact with the outer peripheral surface of the tip of the insertion port,
A flange for preventing falling off is provided on the annular space side of the water stop ring and contacts the outer peripheral surface of the tip of the insertion port,
The water stop ring is fitted on the outer peripheral surface of the tip of the spigot by means of the fall-preventing flange provided around the entire periphery of the water stop ring,
A ridge is provided on at least one of the front end surface of the insertion port of the water stop ring and the inner end surface of the socket,
can do.
Also, an annular support can be provided on the entire inner circumference of the water stop ring, and the above effects can be similarly obtained.

この発明は、以上のように構成して、挿し口の挿し込み力で円環状空間の密封性を担保するようにしたので、その密封性も確実であり、大がかりな装置も必要はない。また、接合する管同士の内径が異なっても、挿し口先端面と受口奥端面の間に止水リングを介在するので、内径の相違に関係なく止水リングを密に接して介在することができて、止水が確実な水圧試験が可能である。 Since the present invention is configured as described above and the insertion force of the insertion opening is used to secure the sealing performance of the annular space, the sealing performance is reliable and a large-scale device is not required. In addition, even if the inner diameters of the pipes to be joined are different, since the water stop ring is interposed between the tip end face of the insertion port and the inner end face of the receptacle, the water stop ring can be interposed in close contact regardless of the difference in inner diameter. It is possible to perform a water pressure test that ensures water stoppage.

この発明に係る管継手の水圧試験装置の一実施形態の要部断面図BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a main part of an embodiment of a hydraulic pressure testing apparatus for pipe joints according to the present invention; 同実施形態の止水リング部分の一部省略側面図Partial omission side view of the water stop ring part of the same embodiment 図２の切断図であり、（ａ）はＡ－Ａ線、（ｂ）はＢ－Ｂ線It is a cutaway view of FIG. 2, (a) is the AA line, (b) is the BB line 同他の実施形態の要部断面図Principal part cross-sectional view of the other embodiment 同さらに他の実施形態の要部断面図Principal part cross-sectional view of still another embodiment 同実施形態の止水リング部分の一部省略側面図Partial omission side view of the water stop ring part of the same embodiment 図６の切断図であり、（ａ）はＡ－Ａ線、（ｂ）はＢ－Ｂ線、（ｃ）は（ａ）の変形例It is a cutaway view of FIG. 6, (a) is the AA line, (b) is the BB line, (c) is a modification of (a) 同さらに他の実施形態の要部断面図Principal part cross-sectional view of still another embodiment 同さらに他の実施形態の要部断面図Principal part cross-sectional view of still another embodiment 同実施形態の切断図であり、（ａ）は図６におけるＡ－Ａ線、（ｂ）は同Ｂ－Ｂ線It is a cutaway view of the same embodiment, (a) is the AA line in FIG. 6, (b) is the BB line 同さらに他の実施形態の止水リング部分の一部省略側面図Partially omitted side view of the water stop ring part of the same and still another embodiment 図１１の切断図であり、（ａ）はＡ－Ａ線、（ｂ）はＢ－Ｂ線It is a cutaway view of FIG. 11, (a) is the AA line, (b) is the BB line 同さらに他の実施形態の要部断面図Principal part cross-sectional view of still another embodiment 同さらに他の実施形態の要部断面図Principal part cross-sectional view of still another embodiment 同さらに他の実施形態の要部断面図Principal part cross-sectional view of still another embodiment 同さらに他の実施形態の要部断面図Principal part cross-sectional view of still another embodiment 同さらに他の実施形態の要部断面図Principal part cross-sectional view of still another embodiment 同実施形態の止水リング部分の一部省略側面図Partial omission side view of the water stop ring part of the same embodiment 同さらに他の実施形態の要部断面図Principal part cross-sectional view of still another embodiment 同実施形態の止水リング部分の一部省略側面図Partial omission side view of the water stop ring part of the same embodiment

この発明に係る管継手の水圧試験装置の一実施形態を図１～図３に示す。この実施形態はＫ形の管継手であって、一のダクタイル鋳鉄管Ｐ１の受口１内に他のダクタイル鋳鉄管Ｐ２（以下、Ｐ１とＰ２を総称して適宜にＰとする。）の挿し口２を挿入し、その受口１の内周面と挿し口２の外周面との間の円環状空間ａにゴム輪３を介在させ、挿し口２の外周に円環状の押輪４を取り付けて、その押輪４でゴム輪３を空間ａ内に押し込んで固定した構成である。
そのゴム輪３の押し込みは、受口１のフランジ５から押輪４にＴ字ボルト６を挿通し、そのボルト６にナット７をねじ込んで行う。そのねじ込み度合いによって押し込み度合いを調整する。鋳鉄管Ｐ（Ｐ１、Ｐ２）はその内周面にモルタルライニングやエポキシ樹脂等からなる防食層８が形成されている。 1 to 3 show an embodiment of a hydraulic pressure testing apparatus for pipe joints according to the present invention. This embodiment is a K-type pipe joint, in which another ductile cast iron pipe P2 (hereinafter, P1 and P2 are collectively referred to as P as appropriate) is inserted into the socket 1 of one ductile cast iron pipe P1. The opening 2 is inserted, a rubber ring 3 is interposed in the annular space a between the inner peripheral surface of the socket 1 and the outer peripheral surface of the insertion opening 2, and an annular pressing ring 4 is attached to the outer periphery of the insertion opening 2. Then, the rubber ring 3 is pushed into the space a by the pressing ring 4 and fixed.
The rubber ring 3 is pushed in by inserting a T-shaped bolt 6 from the flange 5 of the socket 1 into the pressing ring 4 and screwing a nut 7 onto the bolt 6 . The degree of pushing is adjusted according to the degree of screwing. The cast-iron pipes P (P1, P2) have an anti-corrosion layer 8 made of mortar lining, epoxy resin, or the like formed on the inner peripheral surface thereof.

この発明は、このような管継手において、ゴム輪３による空間ａの水密性を試験する水圧試験に係わるものであり、挿し口２の先端面２ａと受口１の奥端面１ａとの間に断面ほぼ長方形（図３（ｂ）参照）の円環状の合成ゴム等からなる弾性を有する止水リング１１を介在し、その止水リング１１は、その円環部分が充水加圧・空気抜き孔１２、１３を除いて中身の詰まった断面を有する点が特徴である。その中身の詰まったとは、完全な無垢状態を言うのではなく、圧縮されることによって水密性を維持し得る程度の気泡を有するものも含まれる。
止水リング１１は、中心に対して対称の最上下位置に貫通孔１２、１３が形成されて、その上側貫通孔１２が上記空気抜き用（排気管）、下側貫通孔１３が充水・加圧用（充水管）である。 This invention relates to a hydraulic test for testing the watertightness of the space a formed by the rubber ring 3 in such a pipe joint. An elastic water stop ring 11 made of synthetic rubber or the like having a substantially rectangular cross section (see FIG. 3(b)) is interposed. It is characterized by having a solid cross section except for the air vent holes 12 and 13 . The term "solid" does not mean a completely solid state, but also includes those having air bubbles to the extent that they can maintain watertightness by being compressed.
The water stop ring 11 is formed with through holes 12 and 13 at the top and bottom positions symmetrical with respect to the center. It is for pressure (filling pipe).

両貫通孔１２、１３の外側端は座ぐり１４（図３（ａ）参照）がなされて水ｗが円環状空間ａに円滑に流出入し、空気が円滑に流出入するようになっている。また、両貫通孔１２、１３の内側端は円状に膨出して止水部１５となっている。この止水部１５は、止水リング１１と一体に形成しても別部材を接着や溶着等によって一体としても良い。さらに、両貫通孔１２，１３には、バルブ１６を介して可撓性パイプ（配管）９が接続可能となっている。貫通孔１２、１３は、現場において形成しても良いが、予め、工場などにおいて、止水リング１１に形成しておくことが好ましい。配管９は貫通孔１２、１３内に途中まで挿入した又は貫通したものとし得る。 The outer ends of both through holes 12 and 13 are counterbore 14 (see FIG. 3(a)) so that water w can smoothly flow into and out of the annular space a, and air can flow smoothly in and out. . Also, the inner ends of both through holes 12 and 13 bulge out in a circular shape to form a water cutoff portion 15 . The water stop portion 15 may be formed integrally with the water stop ring 11 or may be integrated with another member by adhesion, welding, or the like. Furthermore, a flexible pipe (piping) 9 can be connected to both through holes 12 and 13 via a valve 16 . Although the through-holes 12 and 13 may be formed on site, it is preferable to form the through-holes 12 and 13 in the water stop ring 11 in advance at a factory or the like. The pipe 9 can be inserted halfway through the through-holes 12 and 13 or passed through them.

この実施形態は以上の構成であり、水圧試験は、まず、一のダクタイル鋳鉄管Ｐ１の受口１内に他のダクタイル鋳鉄管Ｐ２の挿し口２を挿入する際、挿し口先端面２ａと受口１の奥端面１ａとの間の全周に止水リング１１を介在して（挟み込んで）、密封空間ａを形成する。その挿入は、レバーブロック等により、受口１と挿し口２に管軸方向の引き込み力を付与して行う（図１矢印参照）。このとき、止水リング１１の挿し口先端面２ａ及び受口１の奥端面１ａへの面圧は、水圧試験で必要となる０．５ＭＰａ以上となるようにする。 This embodiment has the above configuration. In the hydraulic test, first, when inserting the insertion port 2 of the other ductile cast iron pipe P2 into the socket 1 of the one ductile cast iron pipe P1, the tip surface 2a of the insertion port and the socket A sealed space a is formed by interposing (sandwiching) a water stop ring 11 on the entire periphery between the mouth 1 and the back end face 1a. The insertion is performed by applying a pull-in force in the direction of the tube axis to the socket 1 and the insertion opening 2 using a lever block or the like (see the arrow in FIG. 1). At this time, the surface pressure on the tip end surface 2a of the spigot of the water stop ring 11 and the inner end surface 1a of the socket 1 is set to 0.5 MPa or more, which is required for the water pressure test.

つぎに、密封区間ａが形成されれば、下側の充水・加圧用貫通孔１３に水配管（パイプ）９を接続し、前記密封空間ａに試験用水ｗを送り込む（充水する）とともに、上側の空気抜き用貫通孔１２から密封空間ａ内の空気を排出する。
密封空間ａに水が充満すれば、空気抜き用貫通孔１２側のバルブ１６を締めて、試験水圧である０．５ＭＰａの水圧を負荷し、継手部（ゴム輪３で止水されている部分：空間ａ）からの漏水の有無を検査する。漏水があれば、その個所を確認して修理し、一方、漏水がなければ、検査（試験）は修了する。 Next, when the sealed section a is formed, a water pipe (pipe) 9 is connected to the water filling/pressurizing through hole 13 on the lower side, and the test water w is fed (filled) into the sealed space a. , the air in the sealed space a is discharged from the air vent through hole 12 on the upper side.
When the sealed space a is filled with water, the valve 16 on the side of the air vent through hole 12 is tightened to apply a water pressure of 0.5 MPa, which is the test water pressure, and the joint portion (the portion where the water is stopped by the rubber ring 3: Check for water leakage from space a). If there is a leak, the location is checked and repaired, and if there is no leak, the inspection (test) is completed.

漏水がなく、又は修理後の再検査において漏水がなければ、バルブ１６を開放して水ｗを排出後、止水リング１１を挿し口先端面２ａと受口１の奥端面１ａとの間から取り外す。この止水リング１１の取り外しは、受口１と挿し口２を管軸方向に引き離して行うことが好ましく、取り外しすれば、挿し口２を挿し込んで挿し口先端面２ａと受口１の奥端面１ａとを所要の間隔とする。 If there is no water leakage, or if there is no water leakage in the re-inspection after repair, the valve 16 is opened to drain the water w, and then the water cutoff ring 11 is inserted from between the insert tip end surface 2a and the inner end surface 1a of the receptacle 1. Remove. It is preferable to remove the water stop ring 11 by separating the socket 1 and the insertion opening 2 in the pipe axial direction. The end face 1a is set at a required distance.

図４はＴ形継手の管継手の場合であり、この継手は、受口１内にゴム輪３を装填した状態で、挿し口２を受口１に挿入する。そのとき、上記実施形態と同様に、挿し口先端面２ａと受口奥端面１ａの間に止水リング１１を介在する。
その状態で、上記と同様にして水圧試験を行う。 FIG. 4 shows the case of a pipe joint of a T-shaped joint. In this joint, the spigot 2 is inserted into the socket 1 with the rubber ring 3 installed in the socket 1. As shown in FIG. At this time, the water cutoff ring 11 is interposed between the tip surface 2a of the receptacle and the deep end surface 1a of the receptacle, as in the above embodiment.
In this state, a water pressure test is performed in the same manner as above.

図５～図１０には、上記各実施形態において、上記空間ａ側において止水リング１１の挿し口先端部外周面に接する脱落防止用鍔１８を設けた各実施形態を示す。
この鍔１８は、一部でも良いが、全周に設けることが好ましい。その全周の場合、突片を一定間隔で設けたり、全周に連続的に（全周に亘って）設けたりすることができる。一定間隔は等間隔が好ましい。これらの場合、鍔１８によって止水リング１１が挿し口２の外周面に嵌れば、挿し口２から止水リング１１が外れ難いため、止水リング１１を挿し口２に嵌めた（取り付けた）状態で挿し口２を受口１に挿入する際、止水リング１１が外れることがない。このため、挿入作業が円滑である。 FIGS. 5 to 10 show embodiments in which a drop-off preventing collar 18 is provided in contact with the outer peripheral surface of the tip of the insertion opening of the water stop ring 11 on the side of the space a.
Although this collar 18 may be partially provided, it is preferable to provide it on the entire circumference. In the case of the entire circumference, the projecting pieces can be provided at regular intervals or continuously (over the entire circumference). Equal intervals are preferable for the constant intervals. In these cases, if the water stop ring 11 is fitted to the outer peripheral surface of the insertion port 2 by the flange 18, the water stop ring 11 is difficult to come off from the insertion port 2, so the water stop ring 11 is fitted (attached) to the insertion port 2. ), the water stop ring 11 does not come off when the insertion port 2 is inserted into the socket 1.例文帳に追加Therefore, the insertion work is smooth.

図５～図８に示す実施形態は、止水リング１１の空間ａ側に座ぐり１４を有する場合であり（図７（ａ）参照）、図９、図１０は、座ぐり１４を無くして貫通孔１２、１３をその軸上で空間ａに開口したものである。図５、図８の実施形態においても、図７（ｃ）に示すように、貫通孔１２、１３をその軸上で空間ａに開口したものとすることができる。挿し口２の先端外周面はカットされている場合が多い（図９のテーパ面２ｂ参照）。その場合は、そのテーパ面２ｂに添うように、鍔１８の内側面は傾斜面１８ａとすることが好ましい（図１０参照）。この傾斜面１８ａは図８に示す実施形態においても採用できる。 The embodiment shown in FIGS. 5 to 8 is a case where the counterbore 14 is provided on the space a side of the water stop ring 11 (see FIG. 7(a)), and FIGS. The through holes 12 and 13 are opened to the space a on their axes. 5 and 8, as shown in FIG. 7(c), the through holes 12 and 13 can be opened to the space a on their axes. In many cases, the outer peripheral surface of the tip of the insertion port 2 is cut (see the tapered surface 2b in FIG. 9). In that case, it is preferable that the inner surface of the collar 18 be formed as an inclined surface 18a along the tapered surface 2b (see FIG. 10). This inclined surface 18a can also be employed in the embodiment shown in FIG.

図１１、図１２に示す実施形態は、止水リング１１の挿し口先端面２ａと受口１の奥端面１ａ側の少なくも一方全周に突条１９を設けたものであり、この実施形態においては、両側面に断面半円状の突条１９を設けている。
このように突条１９を設けると、上記挿し口先端面２ａと受口奥端面１ａが止水リング１１を介して圧接した際、突条１９に押圧力が集中するため、止水リング１１と挿し口先端面２ａ及び受口奥端面１ａとの面圧が高くなって止水性が向上する。 In the embodiment shown in FIGS. 11 and 12, a ridge 19 is provided on at least one of the front end surface 2a of the insertion port of the water stop ring 11 and the inner end surface 1a of the socket 1, and this embodiment. , a ridge 19 having a semicircular cross section is provided on both side surfaces.
With the ridges 19 provided in this way, when the insertion opening front end surface 2a and the receptacle inner end surface 1a are pressed against each other through the water stop ring 11, the pressing force is concentrated on the ridges 19. The surface pressure between the insertion port front end surface 2a and the receptacle inner end surface 1a increases, thereby improving the water stoppage.

図１３、図１４に示す実施形態は、止水リング１１には貫通孔１２、１３を設けず、挿し口２にそれぞれ貫通孔１２、１３を設けたもので、止水リング１１はその円環部分全周が中身の詰まった断面を有するものである。この場合、貫通孔１２、１３と配管（パイプ）９の間にはゴム等によるシール部１７ａを設ける。また、空気抜き用貫通孔１２は挿し口２の最上側、充水・加圧貫通孔１３は同最下側とする。
この場合も、同様に、貫通孔１２、１３において、充水・加圧するとともに、空気抜きして、水圧試験を行う。 In the embodiment shown in FIGS. 13 and 14, the water stop ring 11 is not provided with the through holes 12 and 13, and the insertion port 2 is provided with the through holes 12 and 13, respectively. The partial perimeter has a solid cross-section. In this case, a sealing portion 17a made of rubber or the like is provided between the through holes 12 and 13 and the pipe 9. As shown in FIG. Also, the air vent through-hole 12 is on the uppermost side of the insertion port 2, and the water filling/pressurizing through-hole 13 is on the lowermost side.
In this case, similarly, the through holes 12 and 13 are filled with water and pressurized, and the air is vented, and the water pressure test is performed.

図１５は、ＵＳ形（Ｒ方式）継手の場合である。この管継手は、受口１内面にロックリング２１を有し、挿し口２の外周面には突起２２を有し、その突起２２がロックリング２１に係止することによってそれ以上の抜け出しが阻止され、挿し口先端面２ａが受口奥端面１ａに当接することによってそれ以上の挿し込みが防止される、伸縮離脱防止機能を有する。図中、２３は押輪、２４はスペーサ、２５はロックリングサポータである。 FIG. 15 shows the case of a US type (R type) joint. This pipe joint has a lock ring 21 on the inner surface of the socket 1 and a protrusion 22 on the outer peripheral surface of the insertion port 2. The protrusion 22 engages the lock ring 21 to prevent further withdrawal. Further insertion is prevented by contacting the tip end face 2a of the insertion port with the inner end face 1a of the socket, and has a function of preventing expansion and detachment. In the figure, 23 is a press ring, 24 is a spacer, and 25 is a lock ring supporter.

この管継手おいても、同図に示すように、挿し口先端面２ａと受口奥端面１ａの間に止水リング１１を介在し、上記と同様にして、水圧試験を行う。
また、この実施形態においても、貫通孔１２、１３は、止水リング１１に形成せずに、挿し口２に形成することができる。 In this pipe joint, as shown in the figure, a water stop ring 11 is interposed between the tip end surface 2a of the insertion port and the inner end surface 1a of the receptacle port, and a water pressure test is performed in the same manner as above.
Also in this embodiment, the through-holes 12 and 13 can be formed in the insertion opening 2 instead of being formed in the water stop ring 11 .

図１６は、ＰＩＩ形又はＰＮ形継手の場合である。この管継手は、ロックリング２１が挿し口２外周面の挿し口溝２２ａ内の軸方向移動範囲において受口１に対し挿し口２が抜き差し自在の伸縮離脱防止機能を有するものである。図中、２５ａはセットボルト、２７は押輪、２７ａはゴム輪３を圧縮するためにネジ出しするボルトである。
この管継手においても、同図に示すように、挿し口先端面２ａと受口奥端面１ａの間に止水リング１１を介在して、上記と同様にして、水圧試験を行う。 FIG. 16 is for a PII type or PN type joint. In this pipe joint, the lock ring 21 has a function of preventing expansion and detachment of the spigot 2 with respect to the receptacle 1 within the range of axial movement in the spigot groove 22a on the outer peripheral surface of the spigot 2. In the figure, 25a is a set bolt, 27 is a push ring, and 27a is a bolt for compressing the rubber ring 3. As shown in FIG.
As shown in the figure, this pipe joint is also subjected to a water pressure test in the same manner as described above, with a water cutoff ring 11 interposed between the tip end surface 2a of the insertion port and the inner end surface 1a of the receptacle port.

以上の水圧試験において、図１７、図１８に示すように、止水リング１１を断面円形とし（Ｏリング状とし）、その内面を円環状のサポート３１によって押さえ、水圧によって止水リング１１が内側に逸脱することを防ぐ構成とし得る。止水リング１１は断面円形に限定されず、上記各実施形態の止水リング１１においても、このサポート３１を採用することができる。
また、止水リング１１を断面四角状とし、管Ｐ内面に飛び出る形状とする場合、サポート３１は、挿し口端面２ａと受口奥端面１ａの間に挟まず、管Ｐ内径より小さな外径とする。この場合でも、水圧による力は半径方向のため、サポート３１がその水圧に抗して止水リング１１の管Ｐ内面側への逸脱を防止する。 In the water pressure test described above, as shown in FIGS. 17 and 18, the water stop ring 11 has a circular cross section (O-ring shape), the inner surface of which is pressed by an annular support 31, and the water pressure causes the water stop ring 11 to move inward. It can be configured to prevent deviation from The water stop ring 11 is not limited to a circular cross section, and the support 31 can also be employed in the water stop ring 11 of each of the above embodiments.
In addition, when the cutoff ring 11 has a square cross section and is shaped to protrude from the inner surface of the pipe P, the support 31 is not sandwiched between the insertion port end surface 2a and the receptacle inner surface 1a, and has an outer diameter smaller than the inner diameter of the pipe P. do. Even in this case, since the force due to the water pressure is in the radial direction, the support 31 prevents the water stop ring 11 from deviating toward the inner surface of the pipe P against the water pressure.

サポート３１は、図１８に示すように周囲に分割したものとして、その各分割片３２は相互に連結・解体可能にボルト止めとするとともに、各分割片３２毎、又は少なくとも一個所において、同図に示すように、サポート３１から側方に突出する突片３３にボルト３４をねじ込み、そのボルト３４の先端を挿し口２の内面に当てて、そのねじ込み量を調節することによってサポート３１の高さを調節可能とする。また、各分割片３２を個別に径方向に移動可能に支持し、その支持枠からのボルトの進退によって各分割片３２を進退させて円環状サポート３１が拡縮径可能とすることができる。
この管継手においても、図１７に示すように、挿し口先端面２ａと受口奥端面１ａの間に止水リング１１を介在して、上記と同様にして、水圧試験を行う。 As shown in FIG. 18, the support 31 is divided around the periphery, and each divided piece 32 is bolted so that it can be connected and dismantled with each other. As shown in , a bolt 34 is screwed into a projecting piece 33 protruding sideways from the support 31, the tip of the bolt 34 is brought into contact with the inner surface of the insertion port 2, and the amount of screwing is adjusted to adjust the height of the support 31. be adjustable. In addition, each split piece 32 can be individually supported so as to be radially movable, and each split piece 32 can be advanced and retracted by advancing and retreating bolts from the support frame, so that the diameter of the annular support 31 can be enlarged and reduced.
As shown in FIG. 17, this pipe joint is also subjected to a water pressure test in the same manner as described above, with a water cutoff ring 11 interposed between the spigot front end face 2a and the receptacle inner end face 1a.

図１３、図１４に示す、止水リング１１に貫通孔１２、１３を設けず、挿し口２にそれぞれ貫通孔１２、１３を設けた場合、例えば、図１９、図２０に示すように、油圧ジャッキ３６でその突片３６ａによりシール部１７ａを外側に押圧して挿し口２内面に圧接することができる。このとき、油圧ジャッキ３６とその付属機器は車輪付の車で移動自在とすることができる。この図１９、図２０の実施形態においても、挿し口２に貫通孔１２、１３を形成せずに、貫通孔１２、１３付の止水シール１１を挿し口先端面２ａと受口奥端面１ａに介在したものとすることができる。この場合は、止水シール１１を油圧ジャッキ３６の突片３６ａで押圧する。 13 and 14, when the water stop ring 11 is not provided with the through holes 12 and 13 and the insertion port 2 is provided with the through holes 12 and 13, for example, as shown in FIGS. The jack 36 can push the sealing portion 17a outward with the projecting piece 36a to be brought into pressure contact with the inner surface of the insertion port 2. As shown in FIG. At this time, the hydraulic jack 36 and its accessories can be made movable by a wheeled vehicle. In the embodiment shown in FIGS. 19 and 20 as well, the insertion port 2 is not formed with the through holes 12 and 13, and the waterproof seal 11 with the through holes 12 and 13 is attached to the insertion port front end surface 2a and the socket inner end surface 1a. may be intervened in In this case, the waterproof seal 11 is pressed by the projecting piece 36 a of the hydraulic jack 36 .

図１５、図１６、図１７の実施形態の各管継手においても、止水リング１１に貫通孔（充水加圧・空気抜き孔）１２、１３を形成せず、挿し口２側に同貫通孔１２、１３を形成したものとすることができる。 15, 16, and 17, the through holes (water filling pressurization/air vent holes) 12 and 13 are not formed in the water stop ring 11, and the same through holes are formed on the insertion port 2 side. 12 and 13 can be formed.

上記各実施形態は、Ｋ形管継手、Ｔ形管継手、ＵＳ形（Ｒ方式）管継手、ＰＩＩ形管継手又はＰＮ形管継手の場合であったが、この発明は、挿し口先端面と受口の奥端面とを近接し得る構造であれば、大きな伸びと離脱防止機能を有する種々の管継手にも採用することができる。
また、前記実施形態はダクタイル鋳鉄管であったが、他の鋳鉄管等でもこの発明を採用できることは言うまでもない。
このように、今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。この発明の範囲は、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 Each of the above embodiments is a case of a K-type pipe joint, a T-type pipe joint, a US-type (R-type) pipe joint, a PII-type pipe joint, or a PN-type pipe joint. As long as it has a structure that allows close contact with the inner end face of the socket, it can be employed in various pipe joints having a large elongation and separation prevention function.
In addition, although the above-described embodiment is a ductile cast iron pipe, it goes without saying that the present invention can also be applied to other cast iron pipes.
In this way, the embodiments disclosed this time should be considered as examples and not restrictive in all respects. The scope of the present invention is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope of equivalence to the scope of claims.

１ 受口
１ａ 受口奥端面
２ 挿し口
２ａ 挿し口先端面
３ ゴム輪
４ 押輪
１１ 止水リング
１２ 空気抜き用孔（貫通孔、排気管）
１３ 充水・加圧用孔（貫通孔、充水管）
１７ａ 充水・加圧用孔（充水管）及び空気抜き用孔（排気管）のシール部
１８ 脱落防止用鍔
２１ ロックリング
２２ ロックリング抜け止め用突起
２２ａ 挿し口溝
３１ 円環状サポート
３６ シール部押圧用油圧ジャッキ 1 Receptacle 1a Receptacle inner end surface 2 Insertion opening 2a Insertion opening tip surface 3 Rubber ring 4 Press ring 11 Water stop ring 12 Air vent hole (through hole, exhaust pipe)
13 Water filling/pressurization hole (through hole, water filling pipe)
17a Water filling/pressurizing hole (filling pipe) and air venting hole (exhaust pipe) sealing portion 18 Drop-off prevention flange 21 Lock ring 22 Lock ring retaining projection 22a Insertion groove 31 Annular support 36 For pressing the seal portion hydraulic jack

Claims (8)

一の鋳鉄管（Ｐ１）の受口（１）内に他の鋳鉄管（Ｐ２）の挿し口（２）が挿入されているとともに、前記受口（１）の内周面と挿し口（２）の外周面との間の円環状空間（ａ）にゴム輪（３）が介在されて、前記挿し口先端面（２ａ）と前記受口（１）の奥端面（１ａ）とを近接し得る管継手において、
上記挿し口先端面（２ａ）と上記受口（１）の奥端面（１ａ）との間の全周に介設される止水リング（１１）と、その止水リング（１１）又は前記挿し口（２）にその内側から上記円環状空間（ａ）に貫通する充水加圧・空気抜き孔（１２、１３）と、を有し、
上記止水リング（１１）は、その円環部分が上記充水加圧・空気抜き孔（１２、１３）を有する場合その充水加圧・空気抜き孔（１２、１３）を除いて中身の詰まった断面を有する弾性材からなり、上記充水加圧・空気抜き孔（１２、１３）が上記挿し口（２）にある場合はその円環部分全周が中身の詰まった断面を有する弾性材からなって、上記挿し口（２）を受口（１）に挿し込むことによって、前記挿し口先端面（２ａ）と受口（１）の奥端面（１ａ）との間に密着しており、その密着した状態で上記充水加圧・空気抜き孔（１２、１３）から水（ｗ）を注入して、上記円環状空間（ａ）内に充水して水圧試験を行うことを特徴とする管継手の水圧試験装置。 The insertion port (2) of the other cast iron pipe (P2) is inserted into the socket (1) of the one cast iron pipe (P1), and the inner peripheral surface of the socket (1) and the insertion port (2) are inserted. ), a rubber ring (3) is interposed in the annular space (a) between the outer peripheral surface of the socket (1) and the front end surface (2a) of the insertion port (2a) and the inner end surface (1a) of the socket (1). In the pipe joint obtained,
A water stop ring (11) interposed on the entire circumference between the tip end face (2a) of the insertion port and the inner end face (1a) of the socket (1), and the water stop ring (11) or the insert The mouth (2) has water filling pressurization / air vent holes (12, 13) penetrating from the inside to the annular space (a),
If the annular portion of the water stop ring (11) has the water filling/pressurizing/air venting holes (12, 13), the water stop ring (11) is solid except for the water filling/pressurizing/air venting holes (12, 13). It is made of an elastic material having a cross section, and when the water filling pressurization/air vent holes (12, 13) are in the insertion opening (2), the entire circumference of the annular portion is made of an elastic material having a solid cross section. By inserting the insertion port (2) into the socket (1), the tip surface (2a) of the insertion port and the inner end surface (1a) of the socket (1) are in close contact with each other. A pipe characterized by injecting water (w) from the water filling pressurization / air vent holes (12, 13) in a tight state, filling the annular space (a) with water, and performing a water pressure test. Hydrostatic testing equipment for joints. 上記止水リング（１１）の上記円環状空間（ａ）側に上記挿し口先端部外周面に接する脱落防止用鍔（１８）が設けられ、その脱落防止用鍔（１８）によって止水リング（１１）が挿し口先端部外周面に嵌っていることを特徴とする請求項１に記載の管継手の水圧試験装置。 A detachment prevention brim (18) is provided on the annular space (a) side of the water stop ring (11) and is in contact with the outer peripheral surface of the tip of the insertion port. 11) is fitted on the outer peripheral surface of the tip of the insertion port, the hydraulic test apparatus for pipe joints according to claim 1. 上記止水リング（１１）の上記挿し口先端面（２ａ）と上記受口（１）の奥端面（１ａ）側の少なくも一方全周に突条（１９）を設けたことを特徴とする請求項１又は２に記載の管継手の水圧試験装置。 A ridge (19) is provided on at least one of the front end face (2a) of the insertion port of the water stop ring (11) and the inner end face (1a) of the socket (1). 3. A hydraulic pressure testing apparatus for a pipe joint according to claim 1 or 2. 上記止水リング（１１）の内側全周に円環状のサポート（３１）を設けたことを特徴とする請求項１乃至３の何れか一つに記載の管継手の水圧試験装置。 4. A hydraulic pressure testing apparatus for a pipe joint according to claim 1, wherein an annular support (31) is provided on the entire inner circumference of the water stop ring (11). 一の鋳鉄管（Ｐ１）の受口（１）内に他の鋳鉄管（Ｐ２）の挿し口（２）が挿入されているとともに、前記受口（１）の内周面と挿し口（２）の外周面との間の円環状空間（ａ）にゴム輪（３）が介在されて、前記挿し口先端面（２ａ）と前記受口（１）の奥端面（１ａ）とを近接し得る管継手において、
上記挿し口先端面（２ａ）と上記受口（１）の奥端面（１ａ）との間の全周に止水リング（１１）を介在し、その止水リング（１１）は、円環部分が下記充水加圧・空気抜き孔（１２、１３）を有する場合その充水加圧・空気抜き孔（１２、１３）を除いて中身の詰まった断面を有する弾性材からなり、上記充水加圧・空気抜き孔（１２、１３）が上記挿し口（２）にある場合はその円環部分全周が中身の詰まった断面を有する弾性材からなって、前記挿し口（２）をさらに差し込んでその挿し口先端面（２ａ）と受口奥端面（１ａ）に前記止水リング（１１）を密着し、前記止水リング（１１）又は前記挿し口（２）の内側から上記円環状空間（ａ）に貫通する前記充水加圧・空気抜き孔（１２、１３）を介し水（ｗ）を注入して、前記円環状空間（ａ）内に充水して水圧試験を行うことを特徴とする管継手の水圧試験方法。 The insertion port (2) of the other cast iron pipe (P2) is inserted into the socket (1) of the one cast iron pipe (P1), and the inner peripheral surface of the socket (1) and the insertion port (2) are inserted. ), a rubber ring (3) is interposed in the annular space (a) between the outer peripheral surface of the socket (1) and the front end surface (2a) of the insertion port (2a) and the inner end surface (1a) of the socket (1). In the pipe joint obtained,
A water stop ring (11) is interposed along the entire circumference between the tip surface (2a) of the insertion port and the inner end surface (1a) of the socket (1) , and the water stop ring (11) is an annular portion. has the following water filling/pressurizing/air venting holes (12, 13), the water filling/pressurizing・When the air vent holes (12, 13) are in the insertion opening (2), the entire circumference of the annular portion is made of an elastic material having a solid cross section, and the insertion opening (2) is further inserted into the opening. The water stop ring (11) is brought into close contact with the spigot tip surface (2a) and the receptacle back end face (1a), and the annular space (a ) through the water filling pressurization/air vent holes (12, 13) to fill the annular space (a) with water and perform a water pressure test. Hydrostatic test method for pipe fittings. 上記止水リング（１１）の上記円環状空間（ａ）側に挿し口先端部外周面に接する脱落防止用鍔（１８）を設けて、その鍔（１８）によって止水リング（１１）を挿し口先端部外周面に嵌めることを特徴とする請求項５に記載の管継手の水圧試験方法。 A flange (18) for preventing falling off is provided on the annular space (a) side of the water stop ring (11) and is in contact with the outer peripheral surface of the tip of the insertion opening, and the water stop ring (11) is inserted by the flange (18). 6. The hydraulic test method for a pipe joint according to claim 5, wherein the pipe fitting is fitted on the outer peripheral surface of the tip end portion. 上記止水リング（１１）の上記挿し口先端面（２ａ）と上記受口（１）の奥端面（１ａ）側の少なくも一方全周に突条（１９）を設けたことを特徴とする請求項５又は６に記載の管継手の水圧試験方法。 A ridge (19) is provided on at least one of the front end face (2a) of the insertion port of the water stop ring (11) and the inner end face (1a) of the socket (1). The hydraulic test method for a pipe joint according to claim 5 or 6. 上記止水リング（１１）の内側に円環状のサポート（３１）を設けたことを特徴とする請求項５乃至７の何れか一つに記載の管継手の水圧試験方法。 8. A hydraulic pressure test method for a pipe joint according to any one of claims 5 to 7, wherein an annular support (31) is provided inside said water stop ring (11).
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