JPH0617977A - Mechanical joint of lining steel pipe - Google Patents

Abstract

PURPOSE:To facilitate connection of steel pipes that do not have sockets by providing a cylindrical body over the end part of the inner surface of each lining steel pipe to be connected, and by providing a collar on the outer periphery of the end part of the steel pipe to engage a joint main body with the collar in order to carry out the connection. CONSTITUTION:When lining steel pipes 1a and 1b are to be connected together, a collar 11 is mounted on the outer periphery of the end part of the steel pipe 1a by welding and the like, while one end part of a cylindrical body 2 is fitted into the end part of the steel pipe 1a to a point where a flange 21 provided on the center of the outer periphery is abutted on the end surface of the pipe. A joint main body 3 is fitted in the end part of the steel pipe 1a, and after its engagement stage part 31 is engaged with the collar 11 to be stopped, the end part of the other steel pipe 1b is inserted into a socket 32 of the joint main body 3, and the end part of the pipe is fitted in the other end part of the cylindrical body 2 through a seal material 8. After a rubber ring 5 externally fitted in the end part of the steel pipe 1b is inserted into the socket 32, a retainer 6 is made to abut on a through stop ring 7 on the back surface of the rubber ring, and then a cap nut 4 is screwed to the socket 32 to complete the connection between the steel pipes 1a and 1b.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、内周面が合成樹脂で被
覆されたライニング鋼管同志を接続するためのメカニカ
ル継手に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical joint for connecting lining steel pipes whose inner surface is covered with synthetic resin.

【０００２】[0002]

【従来の技術】従来からライニング鋼管を接続するため
のメカニカル継手としては、図３に要部断面図で示した
ものが知られている。このメカニカル継手は内周面が合
成樹脂で被覆された一方のライニング鋼管１ａの端部に
拡径受口３ａを設け、該受口３ａに他方のライニング鋼
管１ｂの端部を挿入すると共に、拡径受口３ａの外周に
設けた雄ねじに袋ナット４ａを螺合して該袋ナット４ａ
と前記受口３ａとの間にゴムリング５ａとリテーナ６ａ
と抜止リング７ａとを介在させて接続したものである。2. Description of the Related Art Conventionally, as a mechanical joint for connecting a lining steel pipe, a mechanical joint shown in FIG. 3 in a sectional view is known. In this mechanical joint, a diameter-increasing receiving port 3a is provided at the end of one lining steel pipe 1a whose inner peripheral surface is covered with a synthetic resin, and the end of the other lining steel pipe 1b is inserted into the receiving port 3a while expanding. A cap nut 4a is screwed into a male screw provided on the outer circumference of the diameter receiving port 3a,
Between the rubber ring 5a and the retainer 6a
And the retaining ring 7a.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、この従
来継手の場合には、ライニング鋼管の端部が解放された
状態で接続されるため管端面が管内流体と接触して腐蝕
し、赤水が発生するという問題があった。また、この従
来継手は一方のライニング鋼管の端部に拡径受口を設け
ないと接続できないため、受口を有しないライニング鋼
管同志は接続できなかった。However, in the case of this conventional joint, since the end of the lining steel pipe is connected in a released state, the pipe end surface corrodes due to contact with the fluid in the pipe, and red water is generated. There was a problem. Further, since this conventional joint cannot be connected unless a diameter-increasing receiving port is provided at the end of one lining steel pipe, lining steel pipes having no receiving port cannot be connected.

【０００４】本発明はかかる課題を解決したものであっ
て、ライニング鋼管同志を簡単に接続できると共に、管
端部が腐蝕して赤水が発生するのを防止できるメカニカ
ル継手を提供するものである。The present invention has solved the above problems and provides a mechanical joint that can easily connect lining steel pipes to each other and can prevent red water from being generated due to corrosion of pipe ends.

【０００５】[0005]

【課題を解決するための手段】本発明は、内周面が合成
樹脂で被覆された一方のライニング鋼管の端部外周に鍔
を設け、該管端部に継手本体を外挿して該継手本体の受
口の奥側に設けた係止段部に前記鍔を係止させる。ま
た、継手本体の受口に他方のライニング鋼管の端部を挿
入すると共に、該受口の外周に設けた雄ねじに袋ナット
を螺合して該袋ナットと前記受口との間にゴムリングと
リテーナと抜止リングとを介在させて接続する。また、
一方のライニング鋼管の端部に筒状体の一端部を嵌挿す
ると共にその他端部を他方のライニング鋼管の端部に嵌
挿して接続したことを特徴とするものである。According to the present invention, a flange is provided on the outer periphery of one end of one lining steel pipe whose inner peripheral surface is covered with a synthetic resin, and the joint main body is externally inserted to the end of the pipe. The brim is locked to a locking step portion provided on the back side of the receptacle. Further, the end of the other lining steel pipe is inserted into the receiving port of the joint body, and a cap nut is screwed into a male screw provided on the outer periphery of the receiving port to form a rubber ring between the cap nut and the receiving port. And the retainer and the retaining ring to connect. Also,
It is characterized in that one end of a tubular body is fitted and inserted into the end of one lining steel pipe, and the other end is fitted and connected to the end of the other lining steel pipe.

【０００６】[0006]

【作用】筒状体の両端部を双方のライニング鋼管の端部
に嵌挿して接続するので、ライニング鋼管の端部は管内
流体と接触しない。また、一方のライニング鋼管の端部
外周に鍔を設け、該鍔に継手本体を係止させたので、該
継手本体の雄ねじに袋ナットをねじ込んで抜止リングを
縮径させると、該抜止リングの内周面がライニング鋼管
の端部外周面に食い込み、またゴムリングが圧縮されて
管端部外周面に圧接する。Since both ends of the tubular body are fitted and connected to the ends of both lining steel pipes, the ends of the lining steel pipe do not come into contact with the fluid in the pipe. Further, since a flange is provided on the outer periphery of the end of one of the lining steel pipes, and the joint body is locked to the flange, when the cap nut is screwed into the male screw of the joint body to reduce the diameter of the retaining ring, The inner peripheral surface bites into the outer peripheral surface of the end portion of the lining steel pipe, and the rubber ring is compressed and comes into pressure contact with the outer peripheral surface of the pipe end portion.

【０００７】[0007]

【実施例】以下、本発明の実施例を図面にて詳細に説明
する。図１は本発明の一実施例を示すメカニカル継手の
上部半断面図、図２は本発明の他の実施例を示す要部断
面図であって、図中１（１ａ，１ｂ）はライニング鋼
管、２は筒状体、３は継手本体、４は袋ナット、５はゴ
ムリング、６はリテーナ、７は抜止リングである。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an upper half sectional view of a mechanical joint showing one embodiment of the present invention, and FIG. 2 is a sectional view of an essential part showing another embodiment of the present invention, in which 1 (1a, 1b) is a lining steel pipe. Reference numeral 2 is a tubular body, 3 is a joint body, 4 is a cap nut, 5 is a rubber ring, 6 is a retainer, and 7 is a retaining ring.

【０００８】ライニング鋼管１は鋳鉄管、鋼管等の管内
周面を塩化ビニル樹脂、ポリエチレン等の合成樹脂、あ
るいはポリエチレン、ナイロン等の粉体でコーティング
したものであって、その一方のライニング鋼管１ａの端
部外周に鍔１１を設ける。鍔１１はライニング鋼管１ａ
の端部を外周側に折り返してフランジ状に形成したもの
あってもよく、また図１に示した如く管端外周に金属製
のリングを溶接したものであってもよい。更には、図２
に示した如く管端外周に環状溝１１０に設け、該環状溝
１１０に嵌合させたスナップリングで鍔１１を設けても
よい。The lining steel pipe 1 is formed by coating the inner peripheral surface of a cast iron pipe, a steel pipe or the like with a synthetic resin such as vinyl chloride resin, polyethylene or the like, or powder of polyethylene, nylon or the like. A collar 11 is provided on the outer circumference of the end portion. The collar 11 is a lining steel pipe 1a
1 may be formed by folding back the end portion of the pipe to the outer peripheral side to form a flange, or may be formed by welding a metal ring to the outer periphery of the pipe end as shown in FIG. Furthermore, FIG.
Alternatively, the collar 11 may be provided on the outer circumference of the pipe end in the annular groove 110, and the collar 11 may be provided by a snap ring fitted in the annular groove 110.

【０００９】また、ライニング鋼管１ａの端部に筒状体
２の一端部を嵌挿し、その外周中央部に設けたフランジ
２１が管端面に当接するまで押し込んで接続する。この
とき、筒状体２の外周面に接着剤を塗布しておいて接着
接合するとよい。Further, one end of the tubular body 2 is fitted into the end of the lining steel pipe 1a, and the flange 21 provided at the central portion of the outer periphery of the lining steel pipe 1a is pushed and connected until it comes into contact with the pipe end face. At this time, it is advisable to apply an adhesive to the outer peripheral surface of the tubular body 2 and then perform adhesive bonding.

【００１０】次に、このライニング鋼管１ａの端部に継
手本体３を係止させる。継手本体３の一端部には拡径受
口３２が設けられており、該受口３２の奥にテーパ面３
４が形成され、更にその奥側に係止段部３１が設けられ
ている。この継手本体１をライニング鋼管１ａの他端側
から外挿して鍔１１に係止段部３１を係止させる。次
に、この継手本体３の受口３２に他方のライニング鋼管
１ｂの端部を挿入すると共に、該管端部に前記筒状体２
の他端部を嵌挿して接続する。このとき、筒状体２の外
周側にシリコンゴム、水膨張性ゴム、発泡性ゴム等の適
宜のシール材８を装着し、該シール材８にライニング鋼
管１ｂの端面を当接させて接続すると管内流体が浸入し
て管端部が腐蝕するのをより確実に防止することができ
る。Next, the joint body 3 is locked to the end of the lining steel pipe 1a. A diameter-increasing receiving port 32 is provided at one end of the joint body 3, and the tapered surface 3 is provided at the back of the receiving port 32.
4 is formed, and the locking step portion 31 is further provided on the back side thereof. The joint main body 1 is externally inserted from the other end of the lining steel pipe 1a, and the locking step portion 31 is locked to the collar 11. Next, the end portion of the other lining steel pipe 1b is inserted into the receiving port 32 of the joint body 3, and the tubular body 2 is inserted into the pipe end portion.
The other end of the is inserted and connected. At this time, if a suitable sealing material 8 such as silicon rubber, water-expandable rubber, foaming rubber or the like is attached to the outer peripheral side of the tubular body 2 and the end surface of the lining steel pipe 1b is brought into contact with the sealing material 8 for connection. It is possible to more reliably prevent the fluid in the pipe from entering and corroding the pipe end portion.

【００１１】そこで、予め他方のライニング鋼管１ｂの
端部に外挿しておいたゴムリング５を継手本体３の受口
３２に挿入し、その背面にリテーナ６と抜止リング７を
当接させてから該受口３２の外周に設けた雄ねじ３３に
袋ナット４の雌ねじ４１を螺合させる。前記抜止リング
７は径方向の一ケ所が切断されて縮径可能となってお
り、その内周面に鋸歯状の突起が設けられている。この
ため、継手本体３の雄ねじ３３に袋ナット４をねじ込む
と、該袋ナット４のテーパ面４２に押圧されて抜止リン
グ７が縮径し、その内周面に設けた鋸歯状の突起がライ
ニング鋼管１ｂの端部外周面に食い込んで管の抜け出し
が防止される。また、これと同時にゴムリング５がリテ
ーナ６と継手本体３のテーパ面３４との間で圧縮されて
管端部外周面に圧接し、水密性が確保される。Therefore, the rubber ring 5, which has been externally fitted to the end of the other lining steel pipe 1b in advance, is inserted into the receiving port 32 of the joint body 3, and the retainer 6 and the retaining ring 7 are brought into contact with the rear surface thereof. The female screw 41 of the cap nut 4 is screwed into the male screw 33 provided on the outer periphery of the receiving port 32. The retaining ring 7 can be reduced in diameter by cutting it at one radial position, and a serrated protrusion is provided on its inner peripheral surface. Therefore, when the cap nut 4 is screwed into the male screw 33 of the joint body 3, the cap ring 4 is pressed by the cap nut 4 to reduce the diameter of the retaining ring 7, and the serrated projection provided on the inner peripheral surface of the cap ring 4 is lined. The outer peripheral surface of the end portion of the steel pipe 1b is bitten to prevent the pipe from coming out. At the same time, the rubber ring 5 is compressed between the retainer 6 and the taper surface 34 of the joint body 3 to come into pressure contact with the outer peripheral surface of the pipe end portion, thereby ensuring watertightness.

【００１２】[0012]

【発明の効果】以上詳述した如く、本発明はライニング
鋼管の端部外周に鍔を設け、該鍔に継手本体を係止させ
て接続するので、受口を有しないライニング鋼管同志で
も簡単に接続することができる。また、筒状体を介して
ライニング鋼管同志を接続するため、管端部が管内流体
と接触して赤水が発生することもない。更には、継手本
体の雄ねじに袋ナットをねじ込むと、抜止リングがライ
ニング鋼管の端部外周面に食い込んで管の抜け出しが防
止され、これと同時にゴムリングが管端部外周面に圧接
するため管内流体の漏洩を確実に防止できる。As described in detail above, according to the present invention, since a flange is provided on the outer periphery of the end of the lining steel pipe and the joint body is locked by the flange for connection, the lining steel pipes having no receiving port can be easily combined. Can be connected. In addition, since the lining steel pipes are connected to each other through the tubular body, the pipe end does not come into contact with the pipe fluid to generate red water. Furthermore, when the cap nut is screwed into the male screw of the joint body, the retaining ring bites into the outer peripheral surface of the end of the lining steel pipe to prevent the pipe from slipping out, and at the same time, the rubber ring press-contacts the outer peripheral surface of the pipe end, and Fluid leakage can be reliably prevented.

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

【図１】図１は本発明の一実施例を示す上部半断面図で
ある。FIG. 1 is an upper half sectional view showing an embodiment of the present invention.

【図２】図２は本発明の他の実施例を示す要部断面図で
ある。FIG. 2 is a cross-sectional view of essential parts showing another embodiment of the present invention.

【図３】図３は従来継手の要部断面図である。FIG. 3 is a sectional view of a main part of a conventional joint.

【符号の説明】[Explanation of symbols]

１ ライニング鋼管 ２ 筒状体 ３ 継手本体 ４ 袋ナット ５ ゴムリング ６ リテーナ ７ 抜止リング 1 Lining steel pipe 2 Tubular body 3 Joint body 4 Cap nut 5 Rubber ring 6 Retainer 7 Stop ring

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 内周面が合成樹脂で被覆された一方のラ
イニング鋼管（１ａ）の端部外周に鍔（１１）を設け、
該管端部に継手本体（３）を外挿して該継手本体（３）
の受口（３２）の奥側に設けた係止段部（３１）に前記
鍔（１１）を係止させ、また継手本体（３）の受口（３
２）に他方のライニング鋼管（１ｂ）の端部を挿入する
と共に該受口（３２）の外周に設けた雄ねじ（３３）に
袋ナット（４）を螺合して該袋ナット（４）と前記受口
（３２）との間にゴムリング（５）とリテーナ（６）と
抜止リング（７）とを介在させて接続し、また一方のラ
イニング鋼管（１ａ）の端部に筒状体（２）の一端部を
嵌挿すると共にその他端部を他方のライニング鋼管（１
ｂ）の端部に嵌挿して接続したことを特徴とするライニ
ング鋼管のメカニカル継手。1. A collar (11) is provided on the outer periphery of one end of a lining steel pipe (1a) whose inner peripheral surface is covered with a synthetic resin,
The fitting main body (3) is externally inserted to the pipe end portion, and the fitting main body (3) is inserted.
The collar (11) is locked to the locking step portion (31) provided on the back side of the socket (32) of the joint body (3).
Insert the end of the other lining steel pipe (1b) into 2) and screw the cap nut (4) into the male screw (33) provided on the outer periphery of the socket (32) to form the cap nut (4). A rubber ring (5), a retainer (6), and a retaining ring (7) are interposed between the receiving port (32) and connected, and a tubular body (1) is attached to the end of one lining steel pipe (1a). 2) One end of the lining steel pipe (1
A mechanical joint for a lining steel pipe, characterized by being fitted and connected to the end of b).