JP4502158B2 - Fitting for branch pipe connection - Google Patents

Fitting for branch pipe connection Download PDF

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Publication number
JP4502158B2
JP4502158B2 JP2000146270A JP2000146270A JP4502158B2 JP 4502158 B2 JP4502158 B2 JP 4502158B2 JP 2000146270 A JP2000146270 A JP 2000146270A JP 2000146270 A JP2000146270 A JP 2000146270A JP 4502158 B2 JP4502158 B2 JP 4502158B2
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Prior art keywords
pipe
water
packing
fluid
fluid pipe
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JP2000146270A
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JP2001324077A (en
Inventor
強道 高村
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Cosmo Koki Co Ltd
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Cosmo Koki Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、流体管に分岐管を接続する管継手であって、分岐管を接続する接続管が設けられたケースを流体管に装着し、接続管側より挿入したカッターにより流体管に穿孔したのちに、前記接続管に分岐管を接続する分岐管接続用管継手に関する。
【0002】
【従来の技術】
流体管に分岐管を接続する管継手として、図7に示すような割T字管が知られている。
この従来の割T字管Aは、流体管Pの外周部から互いに連結、分解可能なボルト孔を形成したフランジが設けてあるケースB、Cと、分岐管が接続されるフランジD1が端部に形成された接続管Dとからなる。ケースBには、接続管Dが挿入される枝管部Eが突出形成され、その先端にはボルト孔が設けられたフランジE1が一体に形成されている。
【0003】
接続管DのフランジD1には、分岐管のフランジのボルト孔と整合するボルト孔D2が孔設されるとともに、前記枝管部EのフランジE1のボルト孔に貫通するボルトD3が立設されている。接続管Dは円筒部が枝管部E内に挿入され、ボルトD3がフランジE1のボルト孔を貫通してナットB4、B5で固定されている。
【0004】
断面が円形のパッキンFは、リング状に形成されており、枝管部Eの内周面の基部に取り付けられている。この割T字管Aは次のようにして流体管Pに設置される。
【0005】
まず、流体管Pの所定位置の外周面にケースB,Cを外嵌し、フランジ同士をボルト・ナットで締め付けて設置する。
【0006】
次に、ナットB4を緩め、各ナットB5を均等に回して接続管Dを流体管P側に移動させ、パッキンFを接続管Dの円筒部の端部で流体管P外周面に圧着させる。パッキンFの圧着後にナットB4を回しナットB5とでフランジE1を挟み込んで接続管DをケースBに固定する。
【0007】
設置が済んだ割T字管Aの接続管DのフランジD1に穿孔機を取り付けて、カッターを流体管P側に送り出し、回転させながら流体管Pを穿孔する。次にカッターを穿孔機に引き戻し、切断片を回収して、穿孔機をフランジD1より取り外し、分岐管を接続して作業を終了する。
【0008】
流体管Pに通水しながら分岐管を接続する場合は、接続管DのフランジD1に仕切弁を取り付けて一般に知られている不断水穿孔工事を行い、穿孔後に分岐管を仕切弁に接続することにより行われる。
【0009】
【発明が解決しようとする課題】
前記従来の割T字管は、水密性を維持するためにパッキンを接続管で圧接する構造なので、流体管に取り付ける際に接続管を移動させる行為が必要であり、作業性が悪かった。また、パッキンを流体管外周面に強く押し付けて止水するので、応力緩和がおこるポリエチレン管等の軟質合成樹脂製の流体管に対しては使用することができないという問題があった。
【0010】
本発明が解決しようとする課題は、上記問題を解決するためになされたもので、流体管への取り付け作業が容易で、応力緩和が発生するような軟質合成樹脂製の流体管にも使用することができる分岐管接続用管継手を提供する点にある。
【0011】
【課題を解決するための手段】
上記課題を解決するために、本発明の分岐管接続用管継手は、分岐管を接続する接続管が形成されたケースを流体管の外周面に装着し、前記接続管に連通する分岐孔を流体管の外周面に穿設した分岐管接続用管継手であって、
流体管外周面を向く止水面と、接続管の管軸方向を向く受圧面とからなる取付段部が前記接続管の基部に形成されるとともに、前記取付段部には、前記受圧面に当接するパッキン本体に、外面が前記止水面に当接し、その断面が先細りのテーパー状に形成された第1リップ部と、外面が分岐孔の周囲に沿って流体管外周面に当接し、その断面が先細りのテーパー状に形成された第2リップ部とが接続管の管軸方向に突出するように形成されてなる止水パッキンが装着されていることを特徴としている。
本発明によれば、取付段部に止水パッキンが装着されたケースを流体管に設置することにより、受圧面により止水パッキンの接続管円周方向への移動を防止しながら、流体管外周面を向く止水面で止水パッキンを流体管外周面に押し付けることができるので、従来のように別体となっている接続管で止水パッキンを流体管に押し付ける作業が不要となり取付作業が簡素化される。
また、パッキン本体より突出して形成される第1、第2リップ部が止水面および流体管の外周面に当接して止水するので、第1、第2リップ部がパッキン本体を基に折れ曲がる様に変形するため過度の圧力を流体管に与えることがなくなり、軟質合成樹脂管に対しても使用することができる。
【0012】
更に、流体管の内圧を第1、第2リップ部の内側に受けてそれぞれのリップ部の外面を止水面および流体管外周面に押し付けることができるので水密性がよくなり、流体管の多少の変形に対しても対応することができる。
また、第1、第2リップ部の断面がテーパー状に形成されているので両リップ部の基部が厚くなり止水パッキンの材質の弾性によりケースを設置した初期の流体管外周面への圧着力が増し、内圧が低い場合での水密性が良好となる。
【0013】
前記受圧面とパッキン本体とに、止水パッキンの移動を防止する係合部が設けられるとともに、第2リップ部の先端が流体管方向に突出して形成されているのが好ましい。
このようにすると、流体管の変形などによりケースと流体管との距離が開いた場合でも、止水パッキンの移動が抑止されているのでケースと止水パッキンは接触し、第2リップ部が流体管方向に突出して形成されているので止水パッキンと流体管外周面が接触するので、ケースと流体管の水密性が確保される。
【0014】
前記受圧面には、パッキン本体に突出形成された係合片を嵌合する係合凹部が形成されているのが好ましい。
このようにすると、係合片を係合凹部に嵌合することにより、止水パッキンをケースに移動を防止した状態で容易に取り付けることが出来る。
【0015】
【発明の実施の形態】
以下、本発明の実施例を図面に基づいて説明する。
【0016】
図1ないし図3は、本発明の第1実施例を示すもので、布設されているダクタイル鋳鉄等の流体管1の外周面に、ケース2が水密性を保持して装着されている。ケース2は、径方向に2分割可能な第1ケース2aと第2ケース2bとからなり、対向面にフランジ2c、2cが形成されてボルト・ナットで締結されている。ケース2は2分割に限らず3分割などであってよい。
【0017】
第1ケース2aには、流体管1に対してほぼ直交する方向を向く接続管3が一体に設けられており、その接続管3の先端には分岐管を接続するフランジ3aが形成されている。
【0018】
第1ケース2aの内面で接続管3の基部には、接続管3の中心軸方向をほぼ向いた受圧面4aと、流体管1の外周面の方向を向いた止水面4bとによって取付段部4が流体管1に設けられた分岐孔1aに沿う状態で形成されている。
【0019】
前記取付段部4には、受圧面4aに当接するように受圧面4aに沿った形状のパッキン本体5aと、止水面4bに当接すると第1リップ部5bと、流体管1の外周面に当接する第2リップ部5cとよりなる止水パッキン5が取り付けられている。(図4参照)
【0020】
第1リップ部5bは、パッキン本体5aより接続管3の中心方向および止水面4b方向に突出し、その断面は先端に向かって先細りとなるテーパー状に形成され、外面が止水面4bに当接している。
【0021】
第2リップ部5cは、パッキン本体5aより接続管3の中心方向および流体管1方向に突出し、その断面は先端に向かって先細りとなるテーパー状に形成され、外面が流体管1の外面に当接している。
本発明のケース2を用いて流体管1に分岐管(図示していない)を接続するには、次のようにして行われる。
【0022】
まず、取付段部4に止水パッキン5を取り付けた第1ケース2aを流体管1の所定位置に設置し、反対側より流体管1を覆うように第2ケース2bを設置して、第1ケース2a、第2ケース2bのフランジ2c、2c同士をボルト・ナットで締結して流体管1にケース2を固定する。
【0023】
つぎに、接続管3のフランジ3aに図示していない穿孔機を取り付け、円筒形のカッターを回転させながら前進させ、流体管1に分岐孔1aを穿孔する。
【0024】
そして、カッターを後退させて、切片を回収した穿孔機が撤去された接続管3に分岐管を接続して作業は終了する。
【0025】
流体管1に通水した状態で分岐管を接続するには、接続管3のフランジ3aに仕切弁を接続した後に、仕切弁に穿孔機を取り付けて上記作業を行うことによって行われる。
【0026】
ケース2が、止水パッキン5を取付段部4に取り付けた第1ケース2aと、第2ケース2bとで流体管1を挟み込むようにしてに取り付けられているので、止水パッキン5は、接続管3の軸方向を向いた受圧面4aにより接続管3の径方向の移動を防止されながら、流体管1の外周面方向を向いた止水面4bにより流体管1の外周面に当接されるので、ケース2を流体管に取り付けるだけで容易に止水することが出来る。
【0027】
また、第1、第2リップ部5b、5cが、パッキン本体5aより突出し、それぞれの外面が止水面4b、流体管1の外周面に当接するように形成されているので、図5に示すように流体管1の内圧Pを第1、第2リップ部5b、5cの内面が受け、両リップ部5b、5cの外面が止水面4bおよび流体管1の外周面に押し付けられるので確実に止水することが出来る。
【0028】
図4(c)に示すように、止水パッキン5の自然状態で第2リップ部5cが流体管1方向に大きく突出しているので、ケース2を流体管1に取り付けたあとに流体管1が変形して、ケース2と流体管1の距離が開いた場合でも第2リップ部5cが流体管1の外周面に接触し止水する。
【0029】
流体管1がポリエチレン等の軟質合成樹脂管であった場合でも、第1、第2リップ部5b、5cが、パッキン本体5aとの基部で曲がるので過度の応力を与えることがないので本発明の分岐管接続用管継手を使用することができる。
【0030】
図6は、本発明の第2実施例を示すもので、受圧面4aとパッキン本体5aとに、止水パッキン5の移動を防止する係合部が設けられたものであり、ケース2や止水パッキン5は第1実施例と同様に構成されている。
【0031】
止水パッキン5におけるパッキン本体5aの外周面に係合片5dが突出形成さている。係合片5dは、流体管1の管軸方向および管軸直角方向の4ヶ所に設けられているが、6ヶ所や8ヶ所あるいは連続的に設けてもよい。
【0032】
受圧面4aには、前記止水パッキン5の係合片5dに対応する位置に係合凹部4cが設けられている。係合凹部4cは、係合片5dを圧縮して嵌合する大きさに形成されて容易に外れないようになっている。
【0033】
止水パッキン5が取付段部4に、係合片5dおよび係合凹部4cによって移動できないように取り付けられているので、流体管1とケース2が相対移動した場合でも安定した水密性が保たれる。
【0034】
以上、本発明の実施例を図面により説明してきたが、本発明の具体的な構成はこれに限定されるものではない。
例えば、第2実施例では、パッキン本体に係合片が突出形成され、受圧面に係合凹部が形成されていたが、受圧面に係合片を突出形成し、パッキン本体に係合凹部を形成してもよい。また、係合片及び係合凹部は、連続的に形成されていてもよい。
【0035】
【発明の効果】
本発明によれば、取付段部に止水パッキンが装着されたケースを流体管に設置することにより、受圧面により止水パッキンの接続管円周方向への移動を防止しながら、流体管外周面を向く止水面で止水パッキンを流体管外周面に押し付けることができるので、従来のように別体となっている接続管で止水パッキンを流体管に押し付ける作業が不要となり取付作業が簡素化される。
また、パッキン本体より突出して形成される第1、第2リップ部が止水面および流体管の外周面に当接して止水するので、第1、第2リップ部がパッキン本体を基に折れ曲がる様に変形するため過度の圧力を流体管に与えることがなくなり、軟質合成樹脂管に対しても使用することができる。
【0036】
更に、流体管の内圧を第1、第2リップ部の内側に受けてそれぞれのリップ部の外面を止水面および流体管外周面に押し付けることができるので水密性がよくなり、流体管の多少の変形に対しても対応することができる。
また、第1、第2リップ部の断面がテーパー状に形成されているので両リップ部の基部が厚くなり止水パッキンの材質の弾性によりケースを設置した初期の流体管外周面への圧着力が増し、内圧が低い場合での水密性が良好となる。
【0037】
請求項の発明によれば、流体管の変形などによりケースと流体管との距離が開いた場合でも、止水パッキンの移動が抑止されているのでケースと止水パッキンは接触し、第2リップ部が流体管方向に突出して形成されているので止水パッキンと流体管外周面が接触するので、ケースと流体管の水密性が確保される。
【0038】
請求項の発明によれば、係合片を係合凹部に嵌合することにより、止水パッキンをケースに移動を防止した状態で容易に取り付けることが出来る。
【図面の簡単な説明】
【図1】本発明の第1実施例における平面図である。
【図2】同じく、I−I断面図である。
【図3】同じく、II−II断面図である。
【図4】同じく、止水パッキンの(a)は平面図、(b)は正面図、(c)はIII−III断面図である。
【図5】同じく、取付段部の部分拡大断面図である。
【図6】本発明の第2実施例における取付段部の部分拡大断面図である。
【図7】従来例における、(a)は平面図、(b)は正面図、(c)はIV−IV断面図である。
【符号の説明】
1 流体管
1a 分岐孔
2 ケース
2a 第1ケース
2b 第2ケース
2c フランジ
3 接続管
3a フランジ
4 取付段部
4a 受圧面
4b 止水面
4c 係合凹部
5 止水パッキン
5a パッキン本体
5b 第1リップ部
5c 第2リップ部
5d 係合片
[0001]
BACKGROUND OF THE INVENTION
The present invention is a pipe joint for connecting a branch pipe to a fluid pipe, and a case provided with a connection pipe for connecting the branch pipe is attached to the fluid pipe, and the fluid pipe is perforated by a cutter inserted from the connection pipe side. The present invention relates to a branch pipe connection pipe joint that connects a branch pipe to the connection pipe.
[0002]
[Prior art]
As a pipe joint for connecting a branch pipe to a fluid pipe, a split T-shaped pipe as shown in FIG. 7 is known.
This conventional split T-shaped pipe A has cases B and C provided with flanges formed with bolt holes that can be connected and disassembled from the outer periphery of the fluid pipe P, and a flange D1 to which the branch pipe is connected. The connecting pipe D is formed in the following manner. In the case B, a branch pipe portion E into which the connection pipe D is inserted is formed so as to protrude, and a flange E1 provided with a bolt hole is integrally formed at the tip thereof.
[0003]
The flange D1 of the connecting pipe D is provided with a bolt hole D2 that is aligned with the bolt hole of the flange of the branch pipe, and a bolt D3 penetrating through the bolt hole of the flange E1 of the branch pipe portion E. Yes. The connecting pipe D has a cylindrical part inserted into the branch pipe part E, and a bolt D3 passes through the bolt hole of the flange E1 and is fixed by nuts B4 and B5 .
[0004]
The packing F having a circular cross section is formed in a ring shape, and is attached to the base portion of the inner peripheral surface of the branch pipe portion E. The split T-shaped tube A is installed in the fluid tube P as follows.
[0005]
First, the cases B and C are fitted on the outer peripheral surface at a predetermined position of the fluid pipe P, and the flanges are installed with bolts and nuts.
[0006]
Next, the nuts B4 are loosened, the nuts B5 are turned evenly to move the connecting pipe D to the fluid pipe P side, and the packing F is crimped to the outer peripheral surface of the fluid pipe P at the end of the cylindrical portion of the connecting pipe D. After the packing F is pressed, the nut B4 is turned and the flange E1 is sandwiched between the nut B5 and the connecting pipe D is fixed to the case B.
[0007]
A drilling machine is attached to the flange D1 of the connecting pipe D of the split T-shaped pipe A that has been installed, and the cutter is sent to the fluid pipe P side, and the fluid pipe P is drilled while rotating. Next, the cutter is pulled back to the drilling machine, the cut pieces are collected, the drilling machine is removed from the flange D1, the branch pipe is connected, and the operation is completed.
[0008]
When connecting a branch pipe while passing water through the fluid pipe P, a partition valve is attached to the flange D1 of the connection pipe D to perform a generally known continuous water drilling work, and the branch pipe is connected to the gate valve after drilling. Is done.
[0009]
[Problems to be solved by the invention]
Since the conventional split T-shaped tube has a structure in which the packing is pressure-contacted with the connecting pipe in order to maintain watertightness, an action of moving the connecting pipe is required when attaching to the fluid pipe, and workability is poor. Further, since the packing is strongly pressed against the outer peripheral surface of the fluid pipe to stop the water, there is a problem that it cannot be used for a fluid pipe made of a soft synthetic resin such as a polyethylene pipe where stress relaxation occurs.
[0010]
The problem to be solved by the present invention has been made to solve the above-mentioned problem, and is also used for a fluid pipe made of a soft synthetic resin that can be easily attached to a fluid pipe and stress relaxation occurs. It is the point which provides the pipe joint for branch pipe connection which can be performed.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, a branch pipe connecting pipe joint according to the present invention is provided with a case in which a connection pipe for connecting a branch pipe is formed on an outer peripheral surface of a fluid pipe, and a branch hole communicating with the connection pipe is provided. A branch pipe connecting pipe joint drilled in the outer peripheral surface of the fluid pipe,
A mounting step portion formed of a water stop surface facing the outer peripheral surface of the fluid pipe and a pressure receiving surface facing the pipe axis direction of the connecting pipe is formed at the base portion of the connecting pipe, and the mounting step portion contacts the pressure receiving surface. the packing body that is in contact, the outer surface is in contact with the stop surface of the water, a first lip portion which in cross section is formed in tapered tapered outer surface come into contact with the fluid tube outer peripheral surface along the periphery of the branch hole, It is characterized in that a water-stopping packing formed so that the second lip portion whose cross section is formed in a tapered shape projects in the tube axis direction of the connecting pipe is mounted.
According to the present invention, the case where the water stop packing is attached to the mounting step portion is installed in the fluid pipe, thereby preventing the water seal packing from moving in the circumferential direction of the connection pipe by the pressure receiving surface. Since the water-stopping packing can be pressed against the outer periphery of the fluid pipe with the water-stopping surface facing the surface, it is not necessary to press the water-stopping packing against the fluid pipe with a separate connecting pipe as in the past, and installation work is simple. It becomes.
In addition, the first and second lip portions formed to protrude from the packing main body come into contact with the water stop surface and the outer peripheral surface of the fluid pipe to stop the water, so that the first and second lip portions bend based on the packing main body. Therefore, excessive pressure is not applied to the fluid pipe, and it can be used for a soft synthetic resin pipe.
[0012]
Furthermore, since the internal pressure of the fluid pipe is received inside the first and second lip parts and the outer surface of each lip part can be pressed against the water stop surface and the outer peripheral surface of the fluid pipe, water tightness is improved, It is possible to cope with deformation.
In addition, since the cross sections of the first and second lip portions are formed in a taper shape, the base portions of both lip portions are thick, and the pressure applied to the outer peripheral surface of the initial fluid pipe where the case is installed due to the elasticity of the water-proof packing material And the water tightness becomes good when the internal pressure is low.
[0013]
It is preferable that the pressure receiving surface and the packing main body are provided with an engaging portion for preventing the water-stopping packing from moving, and that the tip of the second lip portion protrudes in the fluid pipe direction.
In this case, even when the distance between the case and the fluid pipe is increased due to deformation of the fluid pipe or the like, the movement of the water-stopping packing is suppressed, so that the case and the water-stopping packing are in contact with each other, and the second lip portion is fluid. Since it is formed so as to protrude in the pipe direction, the water-stopping packing and the outer peripheral surface of the fluid pipe are in contact with each other, so that the water tightness of the case and the fluid pipe is ensured.
[0014]
Preferably, the pressure receiving surface is formed with an engagement recess for fitting an engagement piece projecting from the packing body.
If it does in this way, it can attach easily in the state which prevented the movement of the water-proof packing to a case by fitting an engagement piece to an engagement recessed part.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
FIGS. 1 to 3 show a first embodiment of the present invention. A case 2 is mounted on an outer peripheral surface of a fluid pipe 1 made of ductile cast iron or the like while maintaining watertightness. The case 2 includes a first case 2a and a second case 2b that can be divided into two in the radial direction, and flanges 2c and 2c are formed on opposite surfaces and fastened with bolts and nuts. Case 2 is not limited to two divisions, and may be three divisions.
[0017]
The first case 2 a is integrally provided with a connecting pipe 3 that faces in a direction substantially perpendicular to the fluid pipe 1, and a flange 3 a that connects the branch pipe is formed at the tip of the connecting pipe 3. .
[0018]
At the base of the connecting pipe 3 on the inner surface of the first case 2a, a mounting step portion is provided by a pressure receiving surface 4a substantially facing the central axis direction of the connecting pipe 3 and a water blocking surface 4b facing the outer peripheral surface of the fluid pipe 1. 4 is formed in a state along the branch hole 1 a provided in the fluid pipe 1.
[0019]
The mounting step 4 includes a packing body 5a shaped along the pressure receiving surface 4a so as to contact the pressure receiving surface 4a, a first lip portion 5b when contacting the water stop surface 4b, and an outer peripheral surface of the fluid pipe 1. A water-stop packing 5 including a second lip portion 5c that comes into contact is attached. (See Figure 4)
[0020]
The first lip 5b protrudes from the packing body 5a in the center direction of the connecting pipe 3 and the water stop surface 4b, and its cross section is formed in a taper shape that tapers toward the tip, and the outer surface is in contact with the water stop surface 4b. Yes.
[0021]
The second lip 5c protrudes from the packing body 5a toward the center of the connecting pipe 3 and toward the fluid pipe 1, and its cross section is formed in a taper shape that tapers toward the tip, and its outer surface contacts the outer surface of the fluid pipe 1. Touching.
Connecting the branch pipe (not shown) to the fluid pipe 1 using the case 2 of the present invention is performed as follows.
[0022]
First, the first case 2a having the water stop packing 5 attached to the mounting step 4 is installed at a predetermined position of the fluid pipe 1, and the second case 2b is installed so as to cover the fluid pipe 1 from the opposite side. The flanges 2c and 2c of the case 2a and the second case 2b are fastened with bolts and nuts to fix the case 2 to the fluid pipe 1.
[0023]
Next, a drilling machine (not shown) is attached to the flange 3 a of the connection pipe 3, and the cylindrical cutter is advanced while rotating, so that the branch hole 1 a is drilled in the fluid pipe 1.
[0024]
Then, the cutter is moved backward to connect the branch pipe to the connection pipe 3 from which the punching machine that has collected the section is removed, and the operation is completed.
[0025]
In order to connect the branch pipe with water flowing through the fluid pipe 1, after connecting the gate valve to the flange 3 a of the connection pipe 3, a perforator is attached to the gate valve and the above operation is performed.
[0026]
Since the case 2 is mounted so that the fluid pipe 1 is sandwiched between the first case 2a and the second case 2b in which the water-stopping packing 5 is attached to the mounting step 4, the water-stopping packing 5 is connected The pressure-receiving surface 4a facing the axial direction of the pipe 3 prevents the movement of the connecting pipe 3 in the radial direction, and abuts against the outer peripheral surface of the fluid pipe 1 by the water blocking surface 4b facing the outer peripheral surface direction of the fluid pipe 1. Therefore, water can be easily stopped by simply attaching the case 2 to the fluid pipe.
[0027]
Further, since the first and second lip portions 5b and 5c protrude from the packing body 5a and the outer surfaces thereof are formed so as to contact the water stop surface 4b and the outer peripheral surface of the fluid pipe 1, as shown in FIG. The inner pressure P of the fluid pipe 1 is received by the inner surfaces of the first and second lip portions 5b and 5c, and the outer surfaces of both the lip portions 5b and 5c are pressed against the water-stopping surface 4b and the outer peripheral surface of the fluid pipe 1, so I can do it.
[0028]
As shown in FIG. 4 (c), the second lip portion 5 c protrudes greatly in the direction of the fluid pipe 1 in the natural state of the water blocking packing 5, so that the fluid pipe 1 is attached after the case 2 is attached to the fluid pipe 1. Even if the case 2 is deformed and the distance between the case 2 and the fluid pipe 1 is increased, the second lip portion 5c contacts the outer peripheral surface of the fluid pipe 1 and stops water.
[0029]
Even when the fluid pipe 1 is a soft synthetic resin pipe such as polyethylene, the first and second lip parts 5b and 5c are bent at the base part with the packing body 5a, so that excessive stress is not applied. A pipe joint for branch pipe connection can be used.
[0030]
FIG. 6 shows a second embodiment of the present invention, in which the pressure receiving surface 4a and the packing body 5a are provided with an engaging portion for preventing the water-stopping packing 5 from moving. The water packing 5 is configured in the same manner as in the first embodiment.
[0031]
Engagement pieces 5d project from the outer peripheral surface of the packing body 5a of the water-stopping packing 5. The engagement pieces 5d are provided at four locations in the tube axis direction and the direction perpendicular to the tube axis of the fluid tube 1, but may be provided at six locations, eight locations, or continuously.
[0032]
The pressure receiving surface 4 a is provided with an engagement recess 4 c at a position corresponding to the engagement piece 5 d of the water blocking packing 5. The engaging recess 4c is formed in a size that allows the engaging piece 5d to be compressed and fitted so as not to be easily removed.
[0033]
Since the water-stop packing 5 is attached to the attachment step 4 so that it cannot be moved by the engagement piece 5d and the engagement recess 4c, stable watertightness is maintained even when the fluid pipe 1 and the case 2 move relative to each other. It is.
[0034]
As mentioned above, although the Example of this invention has been described with reference to the drawings, the specific configuration of this invention is not limited to this.
For example, in the second embodiment, the engagement piece protrudes from the packing body and the engagement recess is formed on the pressure receiving surface. However, the engagement piece protrudes from the pressure receiving surface and the engagement recess is formed on the packing body. It may be formed. Moreover, the engagement piece and the engagement recessed part may be formed continuously.
[0035]
【The invention's effect】
According to the present invention, the case where the water stop packing is attached to the mounting step portion is installed in the fluid pipe, thereby preventing the water seal packing from moving in the circumferential direction of the connection pipe by the pressure receiving surface. Since the water-stopping packing can be pressed against the outer periphery of the fluid pipe with the water-stopping surface facing the surface, it is not necessary to press the water-stopping packing against the fluid pipe with a separate connecting pipe as in the past, and installation work is simple. It becomes.
In addition, the first and second lip portions formed to protrude from the packing main body come into contact with the water stop surface and the outer peripheral surface of the fluid pipe to stop the water, so that the first and second lip portions bend based on the packing main body. Therefore, excessive pressure is not applied to the fluid pipe, and it can be used for a soft synthetic resin pipe.
[0036]
Furthermore, since the internal pressure of the fluid pipe is received inside the first and second lip parts and the outer surface of each lip part can be pressed against the water stop surface and the outer peripheral surface of the fluid pipe, water tightness is improved, It is possible to cope with deformation.
In addition, since the first and second lip sections are tapered, the base of both lip sections becomes thick, and the pressure applied to the outer peripheral surface of the initial fluid pipe where the case is installed due to the elasticity of the water-stopping packing material And the water tightness becomes good when the internal pressure is low.
[0037]
According to the invention of claim 2 , even when the distance between the case and the fluid pipe is increased due to deformation of the fluid pipe or the like, the movement of the water-stopping packing is suppressed, so that the case and the water-stopping packing are in contact with each other. Since the lip portion is formed so as to protrude in the direction of the fluid pipe, the waterproof seal and the outer peripheral surface of the fluid pipe are in contact with each other, so that the watertightness of the case and the fluid pipe is ensured.
[0038]
According to the invention of claim 3 , by fitting the engagement piece into the engagement recess, the water stop packing can be easily attached to the case in a state where movement is prevented.
[Brief description of the drawings]
FIG. 1 is a plan view of a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II.
FIG. 3 is a sectional view taken along the line II-II.
4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a cross-sectional view taken along line III-III.
FIG. 5 is a partially enlarged sectional view of the mounting step portion.
FIG. 6 is a partially enlarged cross-sectional view of a mounting step portion in a second embodiment of the present invention.
7A is a plan view, FIG. 7B is a front view, and FIG. 7C is a sectional view taken along line IV-IV.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fluid pipe 1a Branch hole 2 Case 2a 1st case 2b 2nd case 2c Flange 3 Connection pipe 3a Flange 4 Mounting step part 4a Pressure-receiving surface 4b Water stop surface 4c Engagement recessed part 5 Water stop packing 5a Packing body 5b 1st lip part 5c Second lip 5d engagement piece

Claims (3)

分岐管を接続する接続管が形成されたケースを流体管の外周面に装着し、前記接続管に連通する分岐孔を流体管の外周面に穿設した分岐管接続用管継手であって、
流体管外周面を向く止水面と、接続管の管軸方向を向く受圧面とからなる取付段部が前記接続管の基部に形成されるとともに、前記取付段部には、前記受圧面に当接するパッキン本体に、外面が前記止水面に当接し、その断面が先細りのテーパー状に形成された第1リップ部と、外面が分岐孔の周囲に沿って流体管外周面に当接し、その断面が先細りのテーパー状に形成された第2リップ部とが接続管の管軸方向に突出するように形成されてなる止水パッキンが装着されていることを特徴とする分岐管接続用管継手。
A pipe joint for branch pipe connection in which a case in which a connection pipe for connecting a branch pipe is formed is attached to the outer peripheral surface of the fluid pipe, and a branch hole communicating with the connection pipe is formed in the outer peripheral surface of the fluid pipe,
A mounting step portion formed of a water stop surface facing the outer peripheral surface of the fluid pipe and a pressure receiving surface facing the pipe axis direction of the connecting pipe is formed at the base portion of the connecting pipe, and the mounting step portion contacts the pressure receiving surface. the packing body that is in contact, the outer surface is in contact with the stop surface of the water, a first lip portion which in cross section is formed in tapered tapered outer surface come into contact with the fluid tube outer peripheral surface along the periphery of the branch hole, A pipe for connecting a branch pipe, characterized in that a water-stopping packing formed so that a second lip portion having a tapered shape with a tapered cross-section projects in the pipe axis direction of the connection pipe is mounted. Fittings.
前記受圧面とパッキン本体とに、止水パッキンの移動を防止する係合部が設けられるとともに、第2リップ部の先端が流体管方向に突出して形成されている請求項1に記載の分岐管接続用管継手。  2. The branch pipe according to claim 1, wherein the pressure receiving surface and the packing body are provided with an engaging portion for preventing movement of the water-stopping packing, and a tip of the second lip portion is formed to protrude in the fluid pipe direction. Pipe fitting for connection. 前記受圧面には、パッキン本体に突出形成された係合片を嵌合する係合凹部が形成されている請求項1に記載の分岐管接続用管継手。  The pipe joint for branch pipe connection according to claim 1, wherein an engagement recess for fitting an engagement piece projectingly formed on the packing body is formed on the pressure receiving surface.
JP2000146270A 2000-05-18 2000-05-18 Fitting for branch pipe connection Expired - Fee Related JP4502158B2 (en)

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Publication number Priority date Publication date Assignee Title
FI123362B (en) * 2011-06-06 2013-03-15 Efes Tex Ag Process for manufacturing tubular T-branch connections
KR101551847B1 (en) * 2014-03-26 2015-09-11 신일동 주식회사 An branch pipe connecting unit for rehabilitation and method using the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917316B2 (en) * 1976-09-24 1984-04-20 ブラツキリイ・エンジニヤリング・リミテツド branch pipe fitting
JPH0712282A (en) * 1993-06-23 1995-01-17 Kenichi Katayama Saddle of separate flow device
JPH11344189A (en) * 1998-03-31 1999-12-14 Kubota Corp Gasket for snap tap with saddle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5917316B2 (en) * 1976-09-24 1984-04-20 ブラツキリイ・エンジニヤリング・リミテツド branch pipe fitting
JPH0712282A (en) * 1993-06-23 1995-01-17 Kenichi Katayama Saddle of separate flow device
JPH11344189A (en) * 1998-03-31 1999-12-14 Kubota Corp Gasket for snap tap with saddle

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