JP2024061851A5 - Pipe end corrosion protection structure in pipe joint, construction method of pipe end corrosion protection structure, and retaining ring used in pipe end corrosion protection structure - Google Patents
Pipe end corrosion protection structure in pipe joint, construction method of pipe end corrosion protection structure, and retaining ring used in pipe end corrosion protection structure Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims description 52
- 230000007797 corrosion Effects 0.000 title claims description 52
- 238000010276 construction Methods 0.000 title description 6
- 238000012856 packing Methods 0.000 claims description 24
- 230000002093 peripheral effect Effects 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 7
- 238000013459 approach Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 230000008602 contraction Effects 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 description 1
Description
本発明は、管継手における管端防食構造及び管端防食構造の施工方法並びに管端防食構造に用いられる止輪に関する。さらに詳しくは、管が挿入される受口部を有する継手本体と、前記管と前記継手本体との間をシールする環状のパッキンと、前記継手本体に連結され前記パッキンを押圧する押輪と、前記管の管端部から管内に挿入され前記管端部の内周面を覆う防食コアとを備えた管継手における管端防食構造及び管端防食構造の施工方法並びに管端防食構造に用いられる止輪に関する。 The present invention relates to a pipe end corrosion protection structure in a pipe joint, a construction method for the pipe end corrosion protection structure, and a retaining ring used in the pipe end corrosion protection structure. More specifically, the present invention relates to a pipe end corrosion protection structure in a pipe joint that includes a joint body having a receiving portion into which a pipe is inserted, an annular packing that seals between the pipe and the joint body, a pressing ring that is connected to the joint body and presses the packing, and a corrosion protection core that is inserted into the pipe from the pipe end and covers the inner surface of the pipe end, and a construction method for the pipe end corrosion protection structure, and a retaining ring used in the pipe end corrosion protection structure.
かかる従来の実情に鑑みて、本発明は、簡素な構造でありながら作業性がよく、既設管の修理にも適用可能な管継手における管端防食構造及び管端防食構造の施工方法並びに管端防食構造に用いられる止輪を提供することを目的とする。 In view of the above-mentioned conventional situation, the present invention aims to provide a pipe end corrosion protection structure for a pipe joint that is simple in structure yet easy to work with and can also be used to repair existing pipes, a construction method for the pipe end corrosion protection structure, and a retaining ring for use in the pipe end corrosion protection structure.
上記目的を達成するため、本発明に係る管継手における管端防食構造の特徴は、管が挿入される受口部を有する継手本体と、前記管と前記継手本体との間をシールする環状のパッキンと、前記継手本体に連結され前記パッキンを押圧する押輪と、前記管の管端部から管内に挿入され前記管端部の内周面を覆う防食コアとを備えた構成において、前記押輪は、前記受口部に前記パッキンを介在させて前記継手本体に螺合緊締されるユニオンナットであり、前記パッキンとは別体であり且つ前記管端部の外周面に密着する筒状部と前記筒状部から中心に向けて突出するリブとを有するゴムカバーと、前記ユニオンナットの外周面に係止されるフックを備えた止輪とをさらに備え、前記止輪は、互いを対向させて緊締手段により前記管の外周面に固定される一対の分割体と、前記緊締手段が挿通され且つ前記一対の分割体に挟持されるゴム部材とを有し、前記分割体は、前記管の外周面に沿う本体部と、先端に前記フックが設けられ前記管の軸方向に沿うアームと、前記本体部の端部から外方へ向けて突出し前記アームが設けられた突出部とを少なくとも備え、前記本体部の裏面には、前記管側へ向けて突出する歯部が前記本体部の端部と前記本体部の長手方向の中央部との間に形成され且つ前記中央部に対し線対称に一対設けられてあり、前記突出部は、前記緊締手段が貫通する貫通孔を有し前記ゴム部材を挟持するフランジ部を少なくとも有し、各分割体を前記フックにより前記ユニオンナットの前記外周面に係止させると共に前記一対の分割体を前記緊締手段で連結して前記ゴム部材を対向する各フランジ部で挟持した状態において、前記歯部の歯先の内径は前記管の外径と前記ゴムカバーの肉厚の２倍との和よりも大であることにある。 In order to achieve the above object, the pipe end corrosion protection structure in the pipe joint according to the present invention is characterized by a joint body having a receiving portion into which a pipe is inserted, an annular packing that seals between the pipe and the joint body, a pressure ring connected to the joint body and pressing the packing, and a corrosion protection core that is inserted into the pipe from the pipe end and covers the inner peripheral surface of the pipe end, in which the pressure ring is a union nut that is screwed and fastened to the joint body with the packing interposed in the receiving portion, and further comprises a rubber cover that is separate from the packing and has a cylindrical portion that is in close contact with the outer peripheral surface of the pipe end and a rib that protrudes from the cylindrical portion toward the center, and a retaining ring with a hook that is engaged with the outer peripheral surface of the union nut, and the retaining ring is a pair of divided bodies that are fixed to the outer peripheral surface of the pipe by a fastening means facing each other, and a pair of divided bodies through which the fastening means is inserted and sandwiched between the pair of divided bodies. The split body has at least a main body that runs along the outer circumferential surface of the pipe, an arm with the hook at its tip that runs along the axial direction of the pipe, and a protruding portion that protrudes outward from the end of the main body and has the arm. On the back surface of the main body, a pair of teeth that protrude toward the pipe are formed between the end of the main body and the center of the longitudinal direction of the main body, and are provided line-symmetrically with respect to the center. The protruding portion has at least a flange portion that has a through hole through which the fastening means passes and that clamps the rubber member. When each split body is engaged with the outer circumferential surface of the union nut by the hook, and the pair of split bodies are connected by the fastening means to clamp the rubber member between the opposing flange portions, the inner diameter of the tooth tip of the teeth is greater than the sum of the outer diameter of the pipe and twice the thickness of the rubber cover.
上記構成において、前記受口部の内径及び前記押輪の開口部の内径は、前記管の外径と前記ゴムカバーの肉厚の２倍との和よりも大であり、且つ、前記受口部の内径は前記継手本体の最小内径であり、前記開口部の内径は前記押輪の最小内径であるとよい。 In the above configuration, the inner diameter of the receiving portion and the inner diameter of the opening of the pressure ring are greater than the sum of the outer diameter of the tube and twice the thickness of the rubber cover, and the inner diameter of the receiving portion is the minimum inner diameter of the fitting body, and the inner diameter of the opening is the minimum inner diameter of the pressure ring.
ここで、前記管は、例えば内面ライニング鋼管である。また、前記筒状部の肉厚は、１．０～１．５ｍｍであるとよく、前記筒状部の軸方向への伸縮量は、１．０ｍｍ以下であるとよい。 Here, the pipe is, for example, an internally lined steel pipe. The wall thickness of the cylindrical portion is preferably 1.0 to 1.5 mm, and the amount of expansion and contraction of the cylindrical portion in the axial direction is preferably 1.0 mm or less.
上記目的を達成するため、本発明に係る管継手における管端防食構造の施工方法の特徴は、上記構成に記載の管継手における管端防食構造の施工方法において、新設管の前記管端部に前記ゴムカバー及び前記防食コアを装着させて、前記リブ及び前記防食コアの鍔部により前記管端部の管端面を覆い、前記受口部に前記パッキンを介在させて前記継手本体に前記ユニオンナットを螺合させると共に各分割体を前記フックにより前記ユニオンナットの外周面に係止させて前記一対の分割体を前記緊締手段で連結して前記ゴム部材を対向する各フランジ部で挟持し、前記ゴム部材を挟持した前記一対の分割体と前記ユニオンナットとを連結させた前記継手本体に前記ゴムカバー及び前記防食コアを装着させた前記管端部を前記筒状部の先端が前記ユニオンナットの開口部に近接するまで挿入して、前記継手本体に前記ユニオンナットを螺合緊締させて前記パッキンにより前記筒状部を前記新設管の外周面に押圧させると共に、前記緊締手段により前記一対の分割体を前記新設管に緊締固定して前記中央部を前記新設管に近接させると共に前記歯部を前記新設管に食い込ませることにある。 In order to achieve the above object, the feature of the construction method of the pipe end corrosion protection structure in the pipe joint according to the present invention is that, in the construction method of the pipe end corrosion protection structure in the pipe joint described in the above configuration, the rubber cover and the corrosion protection core are attached to the pipe end of the newly installed pipe, the pipe end surface of the pipe end is covered by the rib and the flange portion of the corrosion protection core, the packing is interposed in the receiving portion, the union nut is screwed onto the joint body, and each divided body is engaged with the outer peripheral surface of the union nut by the hook, and the pair of divided bodies are connected by the fastening means, and the rubber member is fastened to each of the opposing flanges. The pipe end portion, to which the rubber cover and the corrosion protection core are attached, is inserted into the joint body, which is connected to the pair of split bodies holding the rubber member between them and the union nut, until the tip of the tubular part approaches the opening of the union nut, and the union nut is screwed and fastened to the joint body, so that the packing presses the tubular part against the outer circumferential surface of the newly installed pipe, and the pair of split bodies are fastened and fixed to the newly installed pipe by the fastening means, so that the central part approaches the newly installed pipe and the teeth bite into the newly installed pipe.
また、上記目的を達成するため、本発明に係る管継手における管端防食構造の施工方法の他の特徴は、上記構成に記載の管継手における管端防食構造の施工方法において、前記受口部の内径及び前記押輪の開口部の内径は、前記管の外径と前記ゴムカバーの肉厚の２倍との和よりも大であり、且つ、前記受口部の内径は前記継手本体の最小内径であり、前記開口部の内径は前記押輪の最小内径であり、切断した既設管の管端部の各々に前記ゴムカバー及び前記防食コアを装着させて、前記リブ及び前記防食コアの鍔部により前記管端部の管端面を覆い、前記継手本体の両端の各受口部に前記パッキンを介在させて前記継手本体に前記ユニオンナットを螺合させると共に各分割体を前記フックにより前記ユニオンナットの外周面に係止させて前記一対の分割体を前記緊締手段で連結して前記ゴム部材を対向する各フランジ部で挟持し、前記ゴム部材を挟持させた前記一対の分割体と前記ユニオンナットとを連結させた前記継手本体の一方の受口部に前記ゴムカバー及び前記防食コアを装着させた一方の前記既設管の前記管端部を挿入すると共に前記継手本体の他方の受口部に前記一方の前記既設管の前記管端部が位置するまで前記継手本体を移動させ、前記継手本体の他方の受口部に前記ゴムカバー及び前記防食コアを装着させた他方の前記既設管の前記管端部を挿入して、前記ゴムカバー及び前記防食コアを装着させた各管端部の前記筒状部の先端が各ユニオンナットの開口部に近接するまで前記継手本体を移動させ、前記継手本体に前記各ユニオンナットを螺合緊締させて前記パッキンにより前記筒状部を前記既設管の外周面に押圧させると共に、前記緊締手段により前記一対の分割体を前記既設管に緊締固定して前記中央部を前記既設管に近接させると共に前記歯部を前記既設管に食い込ませることにある。 In order to achieve the above object, another feature of the method for constructing a pipe end corrosion protection structure in a pipe joint according to the present invention is that, in the method for constructing a pipe end corrosion protection structure in a pipe joint described in the above configuration, the inner diameter of the receiving portion and the inner diameter of the opening of the pressure ring are greater than the sum of the outer diameter of the pipe and twice the thickness of the rubber cover, and the inner diameter of the receiving portion is the minimum inner diameter of the joint body, and the inner diameter of the opening is the minimum inner diameter of the pressure ring, the rubber cover and the corrosion protection core are attached to each of the pipe ends of the cut existing pipe, the pipe end surface of the pipe end is covered by the rib and the flange portion of the corrosion protection core, the packing is interposed between each receiving portion at both ends of the joint body, the union nut is screwed onto the joint body, and each divided body is engaged with the outer peripheral surface of the union nut by the hook, the pair of divided bodies are connected by the fastening means, the rubber member is clamped between the opposing flange portions, and the rubber member is clamped. The pipe end of one of the existing pipes with the rubber cover and the anticorrosive core attached is inserted into one of the sockets of the joint body that connects the pair of split bodies and the union nut, and the joint body is moved until the pipe end of one of the existing pipes is positioned in the other socket of the joint body, the pipe end of the other existing pipe with the rubber cover and the anticorrosive core attached is inserted into the other socket of the joint body, and the joint body is moved until the tip of the cylindrical part of each pipe end with the rubber cover and the anticorrosive core attached approaches the opening of each union nut, and each union nut is screwed and fastened to the joint body, and the cylindrical part is pressed against the outer peripheral surface of the existing pipe by the packing, and the pair of split bodies are fastened and fixed to the existing pipe by the fastening means, so that the center part approaches the existing pipe and the teeth bite into the existing pipe.
上記目的を達成するため、本発明に係る管継手における管端防食構造に用いられる止輪の特徴は、管が挿入される受口部を有する継手本体と、前記管と前記継手本体との間をシールする環状のパッキンと、前記継手本体に連結され前記パッキンを押圧する押輪と、前記管の管端部から管内に挿入され前記管端部の内周面を覆う防食コアとを備えた管継手における管端防食構造に用いられる止輪において、前記押輪は、前記受口部に前記パッキンを介在させて前記継手本体に螺合緊締されるユニオンナットであり、互いを対向させて緊締手段により前記管の外周面に固定される一対の分割体と、前記緊締手段が挿通され且つ前記一対の分割体に挟持されるゴム部材とを有し、前記分割体は、前記管の外周面に沿う本体部と、前記ユニオンナットの外周面に係止されるフックと、先端に前記フックが設けられ前記管の軸方向に沿うアームと、前記本体部の端部から外方へ向けて突出し前記アームが設けられた突出部とを少なくとも備え、前記本体部の裏面には、前記管側へ向けて突出する歯部が前記本体部の端部と前記本体部の長手方向の中央部との間に形成され且つ前記中央部に対し線対称に一対設けられてあり、前記突出部は、前記緊締手段が貫通する貫通孔を有し前記ゴム部材を挟持するフランジ部を少なくとも有し、各分割体を前記フックにより前記ユニオンナットの前記外周面に係止させると共に前記一対の分割体を前記緊締手段で連結して前記ゴム部材を対向する各フランジ部で挟持した状態において、前記歯部の歯先の内径は前記管の外径と前記ゴムカバーの肉厚の２倍との和よりも大であることにある。 In order to achieve the above object, the feature of the retaining ring used in the pipe end corrosion protection structure in the pipe joint according to the present invention is that in the retaining ring used in the pipe end corrosion protection structure in a pipe joint having a joint body having a receiving portion into which a pipe is inserted, an annular packing that seals between the pipe and the joint body, a pressing ring that is connected to the joint body and presses the packing, and a corrosion protection core that is inserted into the pipe from the pipe end and covers the inner peripheral surface of the pipe end, the pressing ring is a union nut that is screwed and fastened to the joint body with the packing interposed in the receiving portion, and has a pair of divided bodies that are fixed to the outer peripheral surface of the pipe by a fastening means facing each other, and a rubber member through which the fastening means is inserted and sandwiched between the pair of divided bodies, and the divided bodies have a main body portion that fits along the outer peripheral surface of the pipe, and a rubber member that is engaged with the outer peripheral surface of the union nut. The nut has at least a hook that is attached to the end of the main body, an arm with the hook at its tip and aligned along the axial direction of the pipe, and a protruding portion on which the arm is attached that protrudes outward from the end of the main body, and a pair of teeth that protrude toward the pipe are formed on the back surface of the main body between the end of the main body and the center of the longitudinal direction of the main body, and are provided line-symmetrically with respect to the center, and the protruding portion has at least a flange portion that has a through hole through which the fastening means passes and clamps the rubber member, and when each divided body is engaged with the outer circumferential surface of the union nut by the hook and the pair of divided bodies are connected by the fastening means to clamp the rubber member between the opposing flange portions, the inner diameter of the tooth tip of the tooth portion is greater than the sum of the outer diameter of the pipe and twice the thickness of the rubber cover.
上記本発明に係る管継手における管端防食構造及び管端防食構造の施工方法並びに管端防食構造に用いられる止輪の特徴によれば、簡素な構造でありながら作業性がよく、既設管の修理にも適用可能となった。
The pipe end corrosion protection structure in a pipe joint and the installation method of the pipe end corrosion protection structure according to the present invention, as well as the features of the retaining ring used in the pipe end corrosion protection structure, have a simple structure yet are easy to work with, and can also be applied to the repair of existing pipes.
Claims (8)
前記押輪は、前記受口部に前記パッキンを介在させて前記継手本体に螺合緊締されるユニオンナットであり、
前記パッキンとは別体であり且つ前記管端部の外周面に密着する筒状部と前記筒状部から中心に向けて突出するリブとを有するゴムカバーと、前記ユニオンナットの外周面に係止されるフックを備えた止輪とをさらに備え、
前記止輪は、互いを対向させて緊締手段により前記管の外周面に固定される一対の分割体と、前記緊締手段が挿通され且つ前記一対の分割体に挟持されるゴム部材とを有し、
前記分割体は、前記管の外周面に沿う本体部と、先端に前記フックが設けられ前記管の軸方向に沿うアームと、前記本体部の端部から外方へ向けて突出し前記アームが設けられた突出部とを少なくとも備え、
前記本体部の裏面には、前記管側へ向けて突出する歯部が前記本体部の端部と前記本体部の長手方向の中央部との間に形成され且つ前記中央部に対し線対称に一対設けられてあり、
前記突出部は、前記緊締手段が貫通する貫通孔を有し前記ゴム部材を挟持するフランジ部を少なくとも有し、
各分割体を前記フックにより前記ユニオンナットの前記外周面に係止させると共に前記一対の分割体を前記緊締手段で連結して前記ゴム部材を対向する各フランジ部で挟持した状態において、前記歯部の歯先の内径は前記管の外径と前記ゴムカバーの肉厚の２倍との和よりも大である管継手における管端防食構造。 A pipe end corrosion protection structure for a pipe joint comprising: a joint body having a receiving portion into which a pipe is inserted; an annular packing that seals between the pipe and the joint body; a pressure ring that is connected to the joint body and presses the packing; and a corrosion protection core that is inserted into the pipe from the pipe end and covers an inner peripheral surface of the pipe end,
The press ring is a union nut that is screwed and fastened to the joint body with the packing interposed in the receiving portion,
a rubber cover that is separate from the packing and has a cylindrical portion that is in close contact with the outer circumferential surface of the pipe end and a rib that protrudes from the cylindrical portion toward the center; and a retaining ring that has a hook that is engaged with the outer circumferential surface of the union nut,
the retaining ring includes a pair of divided bodies that are fixed to the outer peripheral surface of the pipe by a fastening means facing each other, and a rubber member through which the fastening means is inserted and which is sandwiched between the pair of divided bodies,
The divided body includes at least a main body portion that is aligned along the outer peripheral surface of the pipe, an arm that is aligned along the axial direction of the pipe and has the hook at its tip, and a protrusion that protrudes outward from an end of the main body portion and has the arm provided thereon,
A pair of teeth protruding toward the tube side are formed on the back surface of the main body between an end portion of the main body and a central portion in a longitudinal direction of the main body, and are provided symmetrically with respect to the central portion,
the protruding portion has at least a flange portion having a through hole through which the fastening means passes and for clamping the rubber member;
A pipe end corrosion protection structure in a pipe fitting, in which when each divided body is engaged with the outer peripheral surface of the union nut by the hook and the pair of divided bodies is connected by the fastening means so that the rubber member is clamped between the opposing flange portions, the inner diameter of the tooth tip of the tooth portion is larger than the sum of the outer diameter of the pipe and twice the thickness of the rubber cover.
新設管の前記管端部に前記ゴムカバー及び前記防食コアを装着させて、前記リブ及び前記防食コアの鍔部により前記管端部の管端面を覆い、
前記受口部に前記パッキンを介在させて前記継手本体に前記ユニオンナットを螺合させると共に各分割体を前記フックにより前記ユニオンナットの外周面に係止させて前記一対の分割体を前記緊締手段で連結して前記ゴム部材を対向する各フランジ部で挟持し、
前記ゴム部材を挟持した前記一対の分割体と前記ユニオンナットとを連結させた前記継手本体に前記ゴムカバー及び前記防食コアを装着させた前記管端部を前記筒状部の先端が前記ユニオンナットの開口部に近接するまで挿入して、
前記継手本体に前記ユニオンナットを螺合緊締させて前記パッキンにより前記筒状部を前記新設管の外周面に押圧させると共に、
前記緊締手段により前記一対の分割体を前記新設管に緊締固定して前記中央部を前記新設管に近接させると共に前記歯部を前記新設管に食い込ませる管継手における管端防食構造の施工方法。 A method for constructing a pipe end corrosion protection structure in a pipe joint according to claim 1, comprising the steps of:
The rubber cover and the corrosion protection core are attached to the pipe end of the newly installed pipe, and the pipe end surface of the pipe end is covered by the rib and the flange portion of the corrosion protection core.
the packing is interposed in the receiving portion, the union nut is screwed onto the joint body, and each divided body is engaged with an outer peripheral surface of the union nut by the hook, the pair of divided bodies are connected by the fastening means, and the rubber member is sandwiched between the opposing flange portions;
The pipe end portion to which the rubber cover and the corrosion protection core are attached is inserted into the joint body in which the pair of divided bodies holding the rubber member therebetween and the union nut are connected, until the tip of the tubular portion approaches the opening of the union nut,
The union nut is screwed and fastened to the joint body, and the packing is used to press the cylindrical portion against the outer circumferential surface of the newly installed pipe,
A method for constructing a pipe end corrosion protection structure in a pipe fitting, in which the pair of divided bodies are fastened to the newly installed pipe by the fastening means, bringing the central portion close to the newly installed pipe and causing the teeth portion to bite into the newly installed pipe.
前記受口部の内径及び前記押輪の開口部の内径は、前記管の外径と前記ゴムカバーの肉厚の２倍との和よりも大であり、且つ、前記受口部の内径は前記継手本体の最小内径であり、前記開口部の内径は前記押輪の最小内径であり、
切断した既設管の管端部の各々に前記ゴムカバー及び前記防食コアを装着させて、前記リブ及び前記防食コアの鍔部により前記管端部の管端面を覆い、
前記継手本体の両端の各受口部に前記パッキンを介在させて前記継手本体に前記ユニオンナットを螺合させると共に各分割体を前記フックにより前記ユニオンナットの外周面に係止させて前記一対の分割体を前記緊締手段で連結して前記ゴム部材を対向する各フランジ部で挟持し、
前記ゴム部材を挟持させた前記一対の分割体と前記ユニオンナットとを連結させた前記継手本体の一方の受口部に前記ゴムカバー及び前記防食コアを装着させた一方の前記既設管の前記管端部を挿入すると共に前記継手本体の他方の受口部に前記一方の前記既設管の前記管端部が位置するまで前記継手本体を移動させ、
前記継手本体の他方の受口部に前記ゴムカバー及び前記防食コアを装着させた他方の前記既設管の前記管端部を挿入して、前記ゴムカバー及び前記防食コアを装着させた各管端部の前記筒状部の先端が各ユニオンナットの開口部に近接するまで前記継手本体を移動させ、
前記継手本体に前記各ユニオンナットを螺合緊締させて前記パッキンにより前記筒状部を前記既設管の外周面に押圧させると共に、
前記緊締手段により前記一対の分割体を前記既設管に緊締固定して前記中央部を前記既設管に近接させると共に前記歯部を前記既設管に食い込ませる管継手における管端防食構造の施工方法。 A method for constructing a pipe end corrosion protection structure in a pipe joint according to claim 1, comprising the steps of:
an inner diameter of the receiving portion and an inner diameter of the opening of the pressure ring are greater than the sum of the outer diameter of the pipe and twice the thickness of the rubber cover, and the inner diameter of the receiving portion is the minimum inner diameter of the joint body and the inner diameter of the opening is the minimum inner diameter of the pressure ring;
The rubber cover and the corrosion protection core are attached to each of the cut pipe ends of the existing pipe, and the pipe end faces of the pipe ends are covered by the rib and the flange portion of the corrosion protection core.
the packing is interposed between each of the socket portions at both ends of the joint body, the union nut is screwed onto the joint body, and each divided body is engaged with an outer peripheral surface of the union nut by the hook, the pair of divided bodies are connected by the fastening means, and the rubber member is sandwiched between the opposing flange portions;
the pipe end of one of the existing pipes to which the rubber cover and the corrosion protection core are attached is inserted into one of the socket portions of the joint body which connects the pair of split bodies holding the rubber member therebetween and the union nut, and the joint body is moved until the pipe end of the one of the existing pipes is positioned in the other socket portion of the joint body;
Insert the pipe end of the other existing pipe, to which the rubber cover and the corrosion protection core are attached, into the other receiving portion of the joint body, and move the joint body until the tip of the tubular portion of each pipe end, to which the rubber cover and the corrosion protection core are attached, is close to the opening of each union nut;
The union nuts are screwed and fastened to the joint body, and the packing presses the cylindrical portion against the outer circumferential surface of the existing pipe,
A method for constructing a pipe end corrosion protection structure in a pipe joint, in which the pair of divided bodies are fastened to the existing pipe by the fastening means, bringing the central portion close to the existing pipe and causing the teeth portion to bite into the existing pipe.
前記押輪は、前記受口部に前記パッキンを介在させて前記継手本体に螺合緊締されるユニオンナットであり、
互いを対向させて緊締手段により前記管の外周面に固定される一対の分割体と、前記緊締手段が挿通され且つ前記一対の分割体に挟持されるゴム部材とを有し、
前記分割体は、前記管の外周面に沿う本体部と、前記ユニオンナットの外周面に係止されるフックと、先端に前記フックが設けられ前記管の軸方向に沿うアームと、前記本体部の端部から外方へ向けて突出し前記アームが設けられた突出部とを少なくとも備え、
前記本体部の裏面には、前記管側へ向けて突出する歯部が前記本体部の端部と前記本体部の長手方向の中央部との間に形成され且つ前記中央部に対し線対称に一対設けられてあり、
前記突出部は、前記緊締手段が貫通する貫通孔を有し前記ゴム部材を挟持するフランジ部を少なくとも有し、
各分割体を前記フックにより前記ユニオンナットの前記外周面に係止させると共に前記一対の分割体を前記緊締手段で連結して前記ゴム部材を対向する各フランジ部で挟持した状態において、前記歯部の歯先の内径は前記管の外径と前記ゴムカバーの肉厚の２倍との和よりも大である管継手における管端防食構造に用いられる止輪。 A retaining ring used in a pipe end corrosion protection structure in a pipe joint including a joint body having a socket portion into which a pipe is inserted, an annular packing that seals between the pipe and the joint body, a pressure ring that is connected to the joint body and presses the packing, and a corrosion protection core that is inserted into the pipe from the pipe end and covers an inner peripheral surface of the pipe end,
The press ring is a union nut that is screwed and fastened to the joint body with the packing interposed in the receiving portion,
The pipe has a pair of divided bodies fixed to an outer circumferential surface of the pipe by a fastening means facing each other, and a rubber member through which the fastening means is inserted and which is sandwiched between the pair of divided bodies,
The divided body includes at least a main body portion that is aligned with the outer peripheral surface of the pipe, a hook that is engaged with the outer peripheral surface of the union nut, an arm that is aligned with the axial direction of the pipe and has the hook at its tip, and a protrusion that protrudes outward from an end of the main body portion and has the arm provided thereon.
A pair of teeth protruding toward the tube side are formed on the back surface of the main body between an end portion of the main body and a central portion in a longitudinal direction of the main body, and are provided symmetrically with respect to the central portion,
the protruding portion has at least a flange portion having a through hole through which the fastening means passes and for clamping the rubber member;
A retaining ring used in a pipe end corrosion protection structure in a pipe fitting, in which when each segment is engaged with the outer peripheral surface of the union nut by the hook and the pair of segments is connected by the fastening means to clamp the rubber member between the opposing flange portions, the inner diameter of the tooth tip of the tooth portion is greater than the sum of the outer diameter of the pipe and twice the thickness of the rubber cover.
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| JP2024040436A JP2024061851A (en) | 2021-05-25 | 2024-03-14 | Pipe end anti-corrosion structure in pipe joint |
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| JP2021088005A JP2022181136A (en) | 2021-05-25 | 2021-05-25 | Pipe end anti-corrosion structure in pipe joint |
| JP2024040436A JP2024061851A (en) | 2021-05-25 | 2024-03-14 | Pipe end anti-corrosion structure in pipe joint |
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| JPH0771668A (en) * | 1993-09-02 | 1995-03-17 | Hitachi Metals Ltd | Pipe fitting for lining pipe |
| JP2002267091A (en) * | 2001-03-09 | 2002-09-18 | Toyo Rasenkan Kogyo Kk | Connecting structure of metal expansion-contraction flexible pipe in pipeline |
| JP5154853B2 (en) * | 2007-07-23 | 2013-02-27 | コスモ工機株式会社 | Pipe fitting |
| JP5456092B2 (en) * | 2012-03-29 | 2014-03-26 | 株式会社川西水道機器 | Pipe detachment prevention device for union nut joint |
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