JP2018105371A - Branch saddle joint - Google Patents

Branch saddle joint Download PDF

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JP2018105371A
JP2018105371A JP2016250547A JP2016250547A JP2018105371A JP 2018105371 A JP2018105371 A JP 2018105371A JP 2016250547 A JP2016250547 A JP 2016250547A JP 2016250547 A JP2016250547 A JP 2016250547A JP 2018105371 A JP2018105371 A JP 2018105371A
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saddle
branch
main pipe
peripheral surface
saddle portion
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JP6904698B2 (en
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宏昭 坂本
Hiroaki Sakamoto
宏昭 坂本
健二 橋津
Kenji Hashitsu
健二 橋津
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Kubota ChemiX Co Ltd
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Kubota ChemiX Co Ltd
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Abstract

CONSTITUTION: A branch saddle joint 10 is configured to extract a branch from a synthetic resin-based main pipe 100, and includes a saddle part 12 and a branch pipe part 14. An inner diameter of the saddle part is set smaller than an outer diameter of the main pipe so that an interval between an inner peripheral surface of the saddle part and an outer peripheral surface of the main pipe is formed in a state where the branch saddle joint is mounted on the main pipe.EFFECT: When a saddle part closely adheres to a main pipe so as to expand, the saddle part apparently embraces the main pipe, so that the saddle part can closely adhere to the main pipe stably to be fixed to the main pipe.SELECTED DRAWING: Figure 6

Description

この発明は分岐サドル継手に関し、特にたとえば、合成樹脂製の本管から分岐を取り出すために本管の外周面に電気融着接合される、分岐サドル継手に関する。   The present invention relates to a branch saddle joint, and more particularly, to a branch saddle joint that is electrically fusion-bonded to an outer peripheral surface of a main pipe in order to take out a branch from a main pipe made of synthetic resin.

従来、合成樹脂製の水道配水管の本管から分岐を取り出すための管の分岐方法として、ＥＦサドル継手およびＥＦサドル付分水栓などの電気融着接合タイプの分岐サドル継手を使用した方法が公知である。   Conventionally, as a method of branching a pipe for taking out a branch from a main pipe of a water pipe made of synthetic resin, there is a method using an electric fusion joint type branch saddle joint such as an EF saddle joint and a water stopper with an EF saddle. It is known.

たとえば、特許文献１には、従来の分岐サドル継手の一例が開示されている。特許文献１の分岐サドル継手は、本管の外周面に融着接合されるサドル部と、サドル部から突出する分岐管部（分岐部本体および分岐管接続部）とを有している。サドル部は、本管の外径と略同じ大きさの内径を有する半円筒状に形成される。   For example, Patent Document 1 discloses an example of a conventional branch saddle joint. The branch saddle joint of Patent Literature 1 has a saddle portion that is fusion-bonded to the outer peripheral surface of the main pipe, and a branch pipe portion (a branch portion main body and a branch pipe connecting portion) that protrudes from the saddle portion. The saddle portion is formed in a semi-cylindrical shape having an inner diameter substantially the same as the outer diameter of the main pipe.

上述のような分岐サドル継手を本管に対して融着接合する際には、本管に分岐サドル継手を載置し、チェーンクランプ等の固定具を用いて、本管の外周面とサドル部の内周面とが密着するように固定する。そして、サドル部内に埋設した電熱線に通電して発熱させ、本管の外周面とサドル部の内周面とを融着接合する。   When the above-mentioned branch saddle joint is fusion-bonded to the main pipe, the branch saddle joint is placed on the main pipe, and the outer peripheral surface of the main pipe and the saddle portion are fixed using a fixture such as a chain clamp. Fix so that it is in close contact with the inner peripheral surface of the. Then, the heating wire embedded in the saddle portion is energized to generate heat, and the outer peripheral surface of the main pipe and the inner peripheral surface of the saddle portion are fusion bonded.

特開２０１５−２１５０４４号公報JP2015-215044

電気融着接合タイプの分岐サドル継手では、融着不良を防止するためには、通電作業中において、本管の外周面とサドル部の内周面とを適切に密着させた状態で固定しておくことが重要である。このため、本管の外周面に対してサドル部の内周面をより安定的に密着させて固定できる分岐サドル継手が望まれる。   In order to prevent poor fusion in the electric fusion bonding type branch saddle joint, it is necessary to fix the outer peripheral surface of the main pipe and the inner peripheral surface of the saddle portion in a state of being in close contact during energization work. It is important to keep For this reason, a branched saddle joint that can fix the inner peripheral surface of the saddle portion in more stable contact with the outer peripheral surface of the main pipe is desired.

それゆえに、この発明の主たる目的は、新規な、分岐サドル継手を提供することである。   Therefore, the main object of the present invention is to provide a novel branch saddle joint.

この発明の他の目的は、本管に対してサドル部を安定的に密着させて固定することができ、本管とサドル部とを適切に融着接合できる、分岐サドル継手を提供することである。   Another object of the present invention is to provide a branch saddle joint that can stably fix the saddle portion to the main pipe and fix the main pipe and the saddle section appropriately. is there.

第１の発明は、合成樹脂製の本管から分岐を取り出すために本管の外周面に電気融着接合される分岐サドル継手であって、分岐孔を有する湾曲板状のサドル部、および分岐孔の周縁部から立ち上がる分岐管部を備え、分岐サドル継手を本管に載置した状態においてサドル部の内周面と本管の外周面との間に隙間が形成されるように、サドル部は、本管の外径よりも小さい内径を有する、分岐サドル継手である。   A first invention is a branch saddle joint that is electrofused and joined to an outer peripheral surface of a main pipe to take out a branch from a synthetic resin main pipe, and includes a curved plate-shaped saddle portion having a branch hole, and a branch The saddle portion includes a branch pipe portion that rises from the peripheral edge of the hole, and a gap is formed between the inner peripheral surface of the saddle portion and the outer peripheral surface of the main pipe when the branch saddle joint is placed on the main pipe. Is a branch saddle joint having an inner diameter smaller than the outer diameter of the main pipe.

第１の発明では、分岐サドル継手は、合成樹脂製の本管から分岐を取り出すために本管の外周面に電気融着接合される継手であって、分岐孔を有する湾曲板状のサドル部と、分岐孔の周縁部から立ち上がる分岐管部とを備える。そして、サドル部の内径は、本管の外径よりも小さく設定される。つまり、サドル部の内周面の曲率半径は、本管の外周面の曲率半径よりも小さく、分岐サドル継手を本管に載置した状態では、サドル部の内周面と本管の外周面との間に隙間が形成される。   In the first invention, the branch saddle joint is a joint that is electrofused to the outer peripheral surface of the main pipe in order to take out the branch from the main pipe made of synthetic resin, and has a curved plate-like saddle portion having a branch hole. And a branch pipe portion rising from the peripheral edge of the branch hole. The inner diameter of the saddle portion is set smaller than the outer diameter of the main pipe. That is, the radius of curvature of the inner peripheral surface of the saddle portion is smaller than the radius of curvature of the outer peripheral surface of the main pipe, and when the branch saddle joint is placed on the main pipe, the inner peripheral surface of the saddle section and the outer peripheral surface of the main pipe A gap is formed between the two.

分岐サドル継手のサドル部と本管とを融着接合するときには、サドルクランプ等の固定具を用いて、サドル部を押し広げるようにして本管に密着させて固定する。このとき、拡径方向に変形されたサドル部には、縮径方向（つまり本管を押圧する方向）に復元力が作用して、サドル部が本管を抱き込む状態となる。   When the saddle portion of the branch saddle joint and the main pipe are fusion-bonded, a fixing tool such as a saddle clamp is used to fix the saddle portion in close contact with the main pipe. At this time, a restoring force acts on the saddle portion deformed in the diameter-enlarging direction in the diameter-reducing direction (that is, the direction in which the main tube is pressed), and the saddle portion embracs the main tube.

第１の発明によれば、サドル部を押し広げるようにして本管に密着させたときに、サドル部が本管を抱き込む状態となるので、本管に対してサドル部を安定的に密着させて固定することができ、本管とサドル部とを適切に融着接合できる。   According to the first aspect of the present invention, when the saddle portion is brought into close contact with the main pipe so as to spread out, the saddle portion is in a state of embedding the main pipe, so that the saddle portion is stably attached to the main pipe. The main pipe and the saddle portion can be appropriately fused and joined.

第２の発明は、第１の発明に従属し、サドル部の周方向中心部における隙間の大きさは、５ｍｍ以上２５ｍｍ以下の範囲である。   The second invention is dependent on the first invention, and the size of the gap at the center portion in the circumferential direction of the saddle portion is in the range of 5 mm to 25 mm.

第２の発明では、分岐サドル継手を本管に載置した状態でサドル部の内周面と本管の外周面との間に形成される隙間の大きさ（高さ）は、サドル部の周方向中心部において、５ｍｍ以上２５ｍｍ以下の範囲に設定される。   In the second invention, the size (height) of the gap formed between the inner peripheral surface of the saddle part and the outer peripheral surface of the main pipe in a state where the branch saddle joint is placed on the main pipe is It is set in the range of 5 mm or more and 25 mm or less in the circumferential center.

第２の発明によれば、サドル部の破損を防止しつつ、本管に対してサドル部を安定的に密着させることができる。   According to the second invention, the saddle portion can be stably adhered to the main pipe while preventing the saddle portion from being damaged.

第３の発明は、第１または第２の発明に従属し、本管の外周面に密着させたときのサドル部の内周面の中心角は、４５度以上１１０度以下の範囲である。   The third invention is dependent on the first or second invention, and the center angle of the inner peripheral surface of the saddle portion when in close contact with the outer peripheral surface of the main pipe is in the range of 45 degrees to 110 degrees.

第３の発明では、サドル部の内周面の中心角は、本管の外周面に密着させたときに、４５度以上１１０度以下の範囲となるように設定される。   In the third invention, the central angle of the inner peripheral surface of the saddle portion is set to be in the range of 45 degrees to 110 degrees when brought into close contact with the outer peripheral surface of the main pipe.

第３の発明によれば、製品の低コスト化および低重量化を図りつつ、本管に対してサドル部を安定的に密着させることができる。   According to the third invention, the saddle portion can be stably adhered to the main pipe while reducing the cost and weight of the product.

第４の発明は、第１ないし第３のいずれかの発明に従属し、サドル部は、電熱線が埋設される電熱線部と、電熱線部の内側に配置される第１コールドゾーンと、電熱線部の外側に配置される第２コールドゾーンとを有し、サドル部の中心角に対する第２コールドゾーンの中心角の割合は、１５％以上３５％以下の範囲である。   A fourth invention is dependent on any one of the first to third inventions, and the saddle portion includes a heating wire portion in which a heating wire is embedded, a first cold zone disposed inside the heating wire portion, And the ratio of the central angle of the second cold zone to the central angle of the saddle portion is in the range of 15% to 35%.

第４の発明では、サドル部は、電熱線が埋設される電熱線部を有し、電熱線部の内側および外側には、融着時における溶融樹脂のはみ出しを防止するためコールドゾーンが形成される。すなわち、サドル部は、電熱線部の内側に第１コールドゾーンを有し、電熱線部の外側に第２コールドゾーンを有する。そして、サドル部の中心角に対して第２コールドゾーンの中心角が占める割合は、１５％以上３５％以下の範囲に設定される。   In the fourth invention, the saddle portion has a heating wire portion in which a heating wire is embedded, and a cold zone is formed inside and outside the heating wire portion to prevent the molten resin from protruding during fusion. The That is, the saddle portion has a first cold zone inside the heating wire portion and a second cold zone outside the heating wire portion. The ratio of the central angle of the second cold zone to the central angle of the saddle portion is set in the range of 15% to 35%.

第４の発明によれば、溶融樹脂のはみ出しを適切に防止しつつ、製品の低コスト化および低重量化を図ることができる。   According to the fourth invention, it is possible to reduce the cost and weight of the product while appropriately preventing the molten resin from protruding.

この発明によれば、サドル部を押し広げるようにして本管に密着させたときに、サドル部が本管を抱き込む状態となるので、本管に対してサドル部を安定的に密着させて固定することができ、本管とサドル部とを適切に融着接合できる。   According to the present invention, when the saddle portion is brought into close contact with the main pipe so as to spread out, the saddle portion is in a state of embracing the main pipe, so that the saddle portion is stably attached to the main pipe. The main pipe and the saddle portion can be appropriately fused and joined.

この発明の上述の目的、その他の目的、特徴および利点は、図面を参照して行う後述の実施例の詳細な説明から一層明らかとなろう。   The above object, other objects, features, and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

この発明の一実施例である分岐サドル継手を本管に取り付けた様子を示す断面図である。It is sectional drawing which shows a mode that the branch saddle joint which is one Example of this invention was attached to the main pipe. 図１の分岐サドル継手を示す正面図である。It is a front view which shows the branch saddle joint of FIG. 図１の分岐サドル継手を示す平面図である。It is a top view which shows the branch saddle joint of FIG. 図１の分岐サドル継手を示す右側面図である。It is a right view which shows the branch saddle joint of FIG. 固定具を用いて分岐サドル継手を本管に固定した様子を示す図解図である。It is an illustration figure which shows a mode that the branch saddle joint was fixed to the main pipe using the fixing tool. 分岐サドル継手を本管に載置した状態を示す図解図である。It is an illustration figure which shows the state which mounted the branch saddle joint in the main pipe. 分岐サドル継手のサドル部を本管に密着させた状態を示す図解図である。It is an illustration figure which shows the state which stuck the saddle part of the branch saddle joint to the main pipe. 分岐サドル継手のサドル部を示す部分断面図である。It is a fragmentary sectional view which shows the saddle part of a branch saddle joint. この発明の他の実施例である分岐サドル継手を示す正面図である。It is a front view which shows the branch saddle joint which is another Example of this invention.

図１を参照して、この発明の一実施例である分岐サドル継手１０は、ポリエチレンおよびポリプロピレン等の熱融着可能な合成樹脂によって形成される水道配水管の本管１００から分岐管１０２を取り出す際に、本管１００の外周面に電気融着接合されるＥＦ（エレクトロフュージョン）サドル継手である。この分岐サドル継手１０は、基本的には水道配水管を不断水分岐するための継手であるが、不断水分岐に用いることに限定されず、たとえば、新規に敷設する水道配水管の断水状態での分岐、或いは、下水管およびガス管などの分岐に用いることも可能である。   Referring to FIG. 1, a branch saddle joint 10 according to one embodiment of the present invention takes out a branch pipe 102 from a main pipe 100 of a water distribution pipe formed of a heat-sealable synthetic resin such as polyethylene and polypropylene. In this case, an EF (electrofusion) saddle joint that is electrofused to the outer peripheral surface of the main pipe 100. This branch saddle joint 10 is basically a joint for branching a water supply pipe without interruption. However, the branch saddle joint 10 is not limited to being used for continuous water branching. For example, in a water supply state of a newly installed water supply pipe, It is also possible to use it for branching of sewage pipes and gas pipes.

以下、図１−図４を適宜参照して、分岐サドル継手１０の全体構成について説明する。図１−図４に示すように、分岐サドル継手１０は、本管１００と同種の熱融着可能な合成樹脂によって一体的に形成されるサドル部１２および分岐管部１４を備える。この実施例では、サドル部１２および分岐管部１４のそれぞれは、ポリエチレンによって形成される。   The overall configuration of the branch saddle joint 10 will be described below with reference to FIGS. As shown in FIGS. 1 to 4, the branch saddle joint 10 includes a saddle portion 12 and a branch pipe portion 14 that are integrally formed of the same type of heat-sealable synthetic resin as the main pipe 100. In this embodiment, each of the saddle portion 12 and the branch pipe portion 14 is formed of polyethylene.

サドル部１２は、所定の内径（曲率半径）を有する断面円弧状の湾曲板状体であり、その中央部には、平面視略真円形の分岐孔１６が形成される。サドル部１２の軸方向の長さは、たとえば１６０ｍｍであり、その厚さは、たとえば１０ｍｍである。また、詳細は後述するように、サドル部１２の内径は、取り付けられる本管１００の外径よりも小さく設定される。つまり、サドル部１２の内周面の曲率半径は、本管１００の外周面の曲率半径よりも小さい。この実施例では、本管１００の外径が２５０ｍｍであるのに対して、サドル部１２の内径は１８０ｍｍである。   The saddle portion 12 is a curved plate-like body having a predetermined inner diameter (curvature radius) and having a circular arc cross section, and a branch hole 16 having a substantially true circular shape in plan view is formed at the center thereof. The length of the saddle portion 12 in the axial direction is, for example, 160 mm, and the thickness thereof is, for example, 10 mm. Further, as will be described in detail later, the inner diameter of the saddle portion 12 is set smaller than the outer diameter of the main pipe 100 to be attached. That is, the radius of curvature of the inner peripheral surface of the saddle portion 12 is smaller than the radius of curvature of the outer peripheral surface of the main pipe 100. In this embodiment, the outer diameter of the main pipe 100 is 250 mm, whereas the inner diameter of the saddle portion 12 is 180 mm.

サドル部１２の内周面側、すなわち本管１００との接合面側には、分岐孔１６を中心にして渦巻き状または葛折り状などの任意の形状に配置された電熱線が埋設される。電熱線の両端部は、サドル部１２の外周面から突出して形成される電源接続端子２０に接続される。電源接続端子２０は、サドル部１２の軸方向両端部に配置されており、この電源接続端子２０を電源に接続して、電熱線に電流を流すことによって、サドル部１２および本管１００の接合面の樹脂が加熱溶融される。また、サドル部１２の外周面には、電源接続端子２０の内側に、サドル部１２および本管１００の融着面同士が融着したことを示すインジケータ２２が形成される。   On the inner peripheral surface side of the saddle portion 12, that is, on the joint surface side with the main pipe 100, a heating wire arranged in an arbitrary shape such as a spiral shape or a twisted shape around the branch hole 16 is embedded. Both ends of the heating wire are connected to a power supply connection terminal 20 formed so as to protrude from the outer peripheral surface of the saddle portion 12. The power connection terminals 20 are arranged at both ends in the axial direction of the saddle portion 12. The power connection terminals 20 are connected to a power source, and a current is passed through the heating wire, thereby joining the saddle portion 12 and the main pipe 100. The resin on the surface is heated and melted. In addition, an indicator 22 is formed on the outer peripheral surface of the saddle portion 12 to indicate that the fusion surfaces of the saddle portion 12 and the main pipe 100 are fused inside the power supply connection terminal 20.

また、サドル部１２には、電熱線が埋設される電熱線部１２ａの内側および外側に、融着時における溶融樹脂のはみ出しを防止するためコールドゾーンが形成される。すなわち、サドル部１２は、電熱線部１２ａと、電熱線部１２ａの内側（サドル部１２の中央部）に配置される第１コールドゾーン１２ｂと、電熱線部１２ａの外側（サドル部１２の周縁部）に配置される第２コールドゾーン１２ｃとを有する（図８参照）。   In addition, a cold zone is formed in the saddle portion 12 on the inside and outside of the heating wire portion 12a in which the heating wire is embedded in order to prevent the molten resin from protruding during fusion. That is, the saddle portion 12 includes a heating wire portion 12a, a first cold zone 12b disposed inside the heating wire portion 12a (a central portion of the saddle portion 12), and an outside of the heating wire portion 12a (the periphery of the saddle portion 12). 2nd cold zone 12c arrange | positioned (refer FIG. 8).

また、分岐孔１６の周縁部には、サドル部１２の径方向外側に向かって立ち上がる分岐管部１４が形成される。分岐管部１４は、サドル部１２から突出する短管状の分岐部本体２４と、分岐部本体２４の軸方向中央部から側方に突出する短管状の分岐管接続部２６とを含む。この分岐管接続部２６に継手などを介して分岐管１０２が接続される。分岐管部１４の内径は、たとえば５０ｍｍである。   In addition, a branch pipe portion 14 that rises outward in the radial direction of the saddle portion 12 is formed at the peripheral edge portion of the branch hole 16. The branch pipe portion 14 includes a short tubular branch portion main body 24 projecting from the saddle portion 12 and a short tubular branch pipe connecting portion 26 projecting laterally from the axial central portion of the branch portion main body 24. The branch pipe 102 is connected to the branch pipe connecting portion 26 via a joint or the like. The inner diameter of the branch pipe portion 14 is, for example, 50 mm.

分岐部本体２４の上端部には、その上端開口を封止するためのキャップ３０が装着される。また、分岐部本体２４の内周面には、その略全体に雌ねじ部が形成され、分岐部本体２４の内部には、穿孔カッタ３２が軸方向（上下方向）に移動可能に設けられる。穿孔カッタ３２としては、公知の穿孔カッタを適宜利用するとよく、また、穿孔カッタ３２の代わりに、カッタ機能のない止水栓を設けることもできる。   A cap 30 for sealing the upper end opening is attached to the upper end portion of the branch body 24. A female thread portion is formed substantially on the inner peripheral surface of the branch portion main body 24, and a perforated cutter 32 is provided in the branch portion main body 24 so as to be movable in the axial direction (vertical direction). As the perforated cutter 32, a known perforated cutter may be used as appropriate, and a water stopcock without a cutter function may be provided instead of the perforated cutter 32.

続いて、このような分岐サドル継手１０を用いて、不断水分岐によって本管１００から分岐を取り出す管の分岐方法について説明する。   Then, the branching method of the pipe | tube which takes out a branch from the main pipe 100 by a continuous water branch using such a branch saddle joint 10 is demonstrated.

先ず、本管１００に対して分岐サドル継手１０を電気融着接合する。具体的には、本管１００の所望の位置に分岐サドル継手１０を載置し、図５に示すように、サドル押え部１０４およびチェーンクランプ部１０６を備えるサドルクランプ等の固定具１０８を使用して、サドル部１２の外周面を上から押さえ付け、本管１００の外周面とサドル部１２の内周面とを密着させて固定する。そして、サドル部１２内に埋設した電熱線に通電して発熱させ、本管１００の外周面とサドル部１２の内周面とを融着接合する。その後、分岐サドル継手１０の分岐管接続部２６に対して分岐管１０２を接続すると共に、穿孔カッタ３２を用いて本管１００を穿孔する。これによって、本管１００と分岐管１０２とが分岐サドル継手１０を介して連通される。   First, the branch saddle joint 10 is electrically fusion bonded to the main pipe 100. Specifically, the branch saddle joint 10 is placed at a desired position of the main pipe 100, and as shown in FIG. 5, a fixture 108 such as a saddle clamp having a saddle presser 104 and a chain clamp 106 is used. Then, the outer peripheral surface of the saddle portion 12 is pressed from above, and the outer peripheral surface of the main pipe 100 and the inner peripheral surface of the saddle portion 12 are fixed in contact with each other. The heating wire embedded in the saddle portion 12 is energized to generate heat, and the outer peripheral surface of the main pipe 100 and the inner peripheral surface of the saddle portion 12 are fusion bonded. Thereafter, the branch pipe 102 is connected to the branch pipe connecting portion 26 of the branch saddle joint 10, and the main pipe 100 is drilled using the drilling cutter 32. As a result, the main pipe 100 and the branch pipe 102 communicate with each other via the branch saddle joint 10.

ここで、本管１００と分岐サドル継手１０との融着不良を防止するためには、通電作業中において、本管１００の外周面とサドル部１２の内周面とを適切に密着させた状態で固定しておくことが重要である。   Here, in order to prevent poor fusion between the main pipe 100 and the branch saddle joint 10, the outer peripheral surface of the main pipe 100 and the inner peripheral surface of the saddle portion 12 are in close contact with each other during the energization operation. It is important to fix with.

そこで、この実施例では、サドル部１２の内径を本管１００の外径よりも小さく設定しておき、サドル部１２を押し広げるように変形させて本管１００に密着させることによって、本管１００に対してサドル部１２を安定的に密着させて固定することができるようにしている。すなわち、サドル部１２が本管１００の外径よりも小さい内径を有することによって、本管１００の外周面にサドル部１２の内周面を密着させるときには、サドル部１２が拡径する方向に変形する。すると、密着状態のサドル部１２には、サドル部１２が縮径する方向、つまり本管１００を押圧する方向に復元力が作用して、サドル部１２が本管１００を抱き込む状態となる。これにより、本管１００に対してサドル部１２が安定的に密着されて固定される。   Therefore, in this embodiment, the inner diameter of the saddle portion 12 is set to be smaller than the outer diameter of the main tube 100, and the saddle portion 12 is deformed so as to be expanded and brought into close contact with the main tube 100. On the other hand, the saddle portion 12 can be stably fixed and adhered. That is, when the saddle portion 12 has an inner diameter smaller than the outer diameter of the main pipe 100, when the inner peripheral surface of the saddle section 12 is brought into close contact with the outer peripheral surface of the main pipe 100, the saddle portion 12 is deformed in the direction of expanding the diameter. To do. Then, a restoring force acts on the saddle portion 12 in a close contact state in a direction in which the saddle portion 12 is reduced in diameter, that is, a direction in which the main tube 100 is pressed, and the saddle portion 12 is in a state of embracing the main tube 100. As a result, the saddle portion 12 is stably adhered and fixed to the main pipe 100.

この際、分岐サドル継手１０を本管１００に載置した状態（密着前の状態）においては、図６に示すように、サドル部１２の内周面と本管１００の外周面との間には隙間が形成されるが、その隙間のサドル部１２の周方向中心部における大きさ（高さ）ｈは、５ｍｍ以上２５ｍｍ以下の範囲に設定されることが好ましい。より好ましい隙間の大きさｈは、１０ｍｍ以上１５ｍｍ以下である。この実施例では、隙間の大きさｈは、１１.７ｍｍである。これは、隙間の大きさｈが小さ過ぎると、本管１００に対するサドル部１２の挟持力が発揮され難いからである。一方、隙間の大きさｈが大き過ぎると、サドル部１２が変形に耐え切れずに破損してしまう恐れがあるからであり、また、隙間が残ってしまう恐れもあるからである。隙間の大きさｈを５ｍｍ以上２５ｍｍ以下の範囲とすることよって、サドル部１２の破損を防止しつつ、本管１００に対してサドル部１２を安定的に密着させることができる。   At this time, in a state where the branch saddle joint 10 is placed on the main pipe 100 (a state before close contact), as shown in FIG. 6, the gap between the inner peripheral surface of the saddle portion 12 and the outer peripheral surface of the main pipe 100 is between. However, it is preferable that the size (height) h of the gap at the center portion in the circumferential direction of the saddle portion 12 is set in a range of 5 mm to 25 mm. A more preferable gap size h is 10 mm or more and 15 mm or less. In this embodiment, the gap size h is 11.7 mm. This is because if the size h of the gap is too small, it is difficult to exert the clamping force of the saddle portion 12 with respect to the main pipe 100. On the other hand, if the size h of the gap is too large, the saddle portion 12 may not be able to withstand deformation and may be damaged, and the gap may remain. By setting the size h of the gap in the range of 5 mm to 25 mm, the saddle portion 12 can be stably adhered to the main pipe 100 while preventing the saddle portion 12 from being damaged.

また、図７に示すように、本管１００の外周面に密着させたときのサドル部１２の内周面の中心角θは、４５度以上１１０度以下の範囲に設定することが好ましく、６０度以上９０度以下の範囲に設定することがより好ましい。この実施例では、中心角θは、７１度である。これは、中心角θが小さ過ぎると、本管１００に対するサドル部１２の挟持力が発揮され難く、また、サドル部１２を押し広げるように変形させるときに大きな力を必要とするからである。一方、中心角θが大きい、つまりサドル部１２が大きいと、多くの成形樹脂材料を必要とし、また、製品の重量が大きくなることにより施工性が悪くなってしまうからである。密着時のサドル部１２の内周面の中心角θを４５度以上１１０度以下の範囲とすることによって、製品の低コスト化および低重量化（施工性の向上）を図りつつ、本管１００に対してサドル部１２を安定的に密着させることができる。   Further, as shown in FIG. 7, the central angle θ of the inner peripheral surface of the saddle portion 12 when closely attached to the outer peripheral surface of the main pipe 100 is preferably set in a range of 45 degrees to 110 degrees, More preferably, it is set in the range of not less than 90 degrees and not more than 90 degrees. In this embodiment, the central angle θ is 71 degrees. This is because if the center angle θ is too small, the holding force of the saddle portion 12 with respect to the main pipe 100 is difficult to be exhibited, and a large force is required when the saddle portion 12 is deformed so as to be expanded. On the other hand, if the central angle θ is large, that is, if the saddle portion 12 is large, a large amount of molding resin material is required, and the workability is deteriorated due to an increase in the weight of the product. By setting the central angle θ of the inner peripheral surface of the saddle portion 12 at the time of close contact within a range of 45 degrees to 110 degrees, the main pipe 100 while reducing the cost and weight of the product (improvement of workability). In contrast, the saddle portion 12 can be stably adhered.

さらに、図８に示すように、密着前の状態におけるサドル部１２の中心角をθ０とし、第２コールドゾーン１２ｃの中心角をθ１とすると、サドル部１２の中心角θ０に対して第２コールドゾーン１２ｃの中心角θ１が占める割合は、１５％以上３５％以下の範囲に設定することが好ましく、１５％以上２５％以下に設定することがより好ましい。この実施例では、中心角θ０に対する中心角θ１の割合は、２４％である。これは、中心角θ１の割合が小さ過ぎると、融着時における溶融樹脂のはみ出しを適切に防止することができないからである。一方、中心角θ１の割合が大きいと、つまり第２コールドゾーン１２ｃが大き過ぎても、サドル部１２に不必要な部分が増えて多くの成形樹脂材料を必要とするだけであり、また、製品の重量が大きくなることにより施工性が悪くなってしまうからである。中心角θ０に対する中心角θ１の割合を１５％以上３５％以下の範囲にすることで、溶融樹脂のはみ出しを適切に防止しつつ、製品の低コスト化および低重量化を図ることができる。   Further, as shown in FIG. 8, when the central angle of the saddle portion 12 in the state before contact is θ0 and the central angle of the second cold zone 12c is θ1, the second cold is relative to the central angle θ0 of the saddle portion 12. The ratio occupied by the central angle θ1 of the zone 12c is preferably set in a range of 15% or more and 35% or less, and more preferably set in a range of 15% or more and 25% or less. In this embodiment, the ratio of the central angle θ1 to the central angle θ0 is 24%. This is because if the ratio of the central angle θ1 is too small, it is not possible to appropriately prevent the molten resin from protruding at the time of fusing. On the other hand, if the ratio of the central angle θ1 is large, that is, even if the second cold zone 12c is too large, an unnecessary portion increases in the saddle portion 12 and only a lot of molding resin material is required. This is because the workability deteriorates due to the increase in weight. By setting the ratio of the central angle θ1 to the central angle θ0 in the range of 15% or more and 35% or less, it is possible to reduce the cost and weight of the product while appropriately preventing the molten resin from protruding.

また、分岐孔１６の中心角をθ２とすると、サドル部１２の中心角θ０に対する分岐孔１６の中心角θ２の割合は、１０％以上３５％以下の範囲に設定することが好ましい。この実施例では、中心角θ０に対する中心角θ２の割合は、３２％である。これは、中心角θ２の割合が小さいと、サドル部１２に不必要な部分が増えて多くの成形樹脂材料を必要とするだけであり、また、製品の重量が大きくなることにより施工性が悪くなってしまうからである。一方、中心角θ２の割合が大き過ぎると、融着力が不足して融着不良を生じてしまう恐れがあるからである。中心角θ０に対する中心角θ２の割合を１０％以上３５％以下の範囲とすることで、融着不良を防止しつつ、製品の低コスト化および低重量化を図ることができる。   When the center angle of the branch hole 16 is θ2, it is preferable that the ratio of the center angle θ2 of the branch hole 16 to the center angle θ0 of the saddle portion 12 is set in a range of 10% to 35%. In this embodiment, the ratio of the central angle θ2 to the central angle θ0 is 32%. This is because if the ratio of the central angle θ2 is small, an unnecessary portion increases in the saddle portion 12 and only a large amount of molding resin material is required, and the workability is poor due to an increase in the weight of the product. Because it becomes. On the other hand, if the ratio of the central angle θ2 is too large, the fusing force is insufficient and there is a risk of causing poor fusing. By setting the ratio of the central angle θ2 to the central angle θ0 in the range of 10% to 35%, it is possible to reduce the cost and weight of the product while preventing poor fusion.

以上のように、この実施例によれば、サドル部１２が本管１００の外径よりも小さい内径を有するので、サドル部１２を押し広げるように変形させて本管１００に密着させたときに、縮径する方向（本管１００を押圧する方向）に作用するサドル部１２の復元力によって、サドル部１２が本管１００を抱き込む状態となる。したがって、本管１００に対してサドル部１２を安定的に密着させて固定することができ、本管１００とサドル部１２とを適切に融着接合できる。   As described above, according to this embodiment, the saddle portion 12 has an inner diameter smaller than the outer diameter of the main pipe 100. Therefore, when the saddle section 12 is deformed so as to be expanded and brought into close contact with the main pipe 100, The saddle portion 12 embracs the main tube 100 by the restoring force of the saddle portion 12 acting in the direction of diameter reduction (the direction in which the main tube 100 is pressed). Therefore, the saddle portion 12 can be stably adhered and fixed to the main pipe 100, and the main pipe 100 and the saddle section 12 can be appropriately fusion-bonded.

また、この実施例によれば、隙間の大きさｈが５ｍｍ以上２５ｍｍ以下の範囲となるように、本管１００の外径よりもサドル部１２の内径を小さく設定している。すなわち、隙間の大きさｈが５ｍｍ以上２５ｍｍ以下となる範囲であれば、サドル部１２の内径を小さくする程度に幅を持たせることができるので、１つのサイズのサドル部１２で、外径の異なる複数の本管１００に対して融着可能となる。したがって、分岐サドル継手１０を複数サイズの本管１００に兼用することが可能となるので、分岐サドル継手１０の製造コストを低減できる。   Further, according to this embodiment, the inner diameter of the saddle portion 12 is set smaller than the outer diameter of the main pipe 100 so that the size h of the gap is in the range of 5 mm to 25 mm. That is, if the gap size h is in the range of 5 mm to 25 mm, the saddle portion 12 can be wide enough to reduce the inner diameter. It can be fused to a plurality of different main pipes 100. Accordingly, the branch saddle joint 10 can be used as the main pipe 100 having a plurality of sizes, so that the manufacturing cost of the branch saddle joint 10 can be reduced.

さらに、この実施例によれば、チェーンクランプ等の固定具を取り付けるための係止用突起をなくし、サドル部１２の形状をシンプルなものとしたので、分岐サドル継手１０の製造が容易となり、製造コストも低減される。   Furthermore, according to this embodiment, since the locking projection for attaching a fixture such as a chain clamp is eliminated and the shape of the saddle portion 12 is simplified, the branch saddle joint 10 can be easily manufactured and manufactured. Cost is also reduced.

ただし、サドル部１２の周方向両端部には、チェーンクランプ等の固定具を取り付けるための係止用突起を形成しておくこともできる。この場合には、係止用突起同士を周方向に連結するように取り付けた固定具を締め込むことによって、サドル部１２の内周面と本管１００の外周面とを密着させるとよい。   However, locking projections for attaching a fixture such as a chain clamp may be formed at both circumferential ends of the saddle portion 12. In this case, the inner peripheral surface of the saddle portion 12 and the outer peripheral surface of the main pipe 100 may be brought into close contact with each other by tightening a fixture attached so as to connect the locking projections in the circumferential direction.

なお、上述の実施例では、分岐サドル継手１０としてＥＦサドル継手を例示したが、これに限定されない。図９に示すように、分岐サドル継手１０は、合成樹脂製のサドル部１２に金属製の分水栓が分岐管部１４として設けられた（つまり分岐管部１４に分水栓を有する）、ＥＦサドル付分水栓であってもよい。   In the above-described embodiment, the EF saddle joint is illustrated as the branch saddle joint 10, but is not limited thereto. As shown in FIG. 9, the branch saddle joint 10 has a metal water faucet provided as a branch pipe portion 14 in a saddle portion 12 made of synthetic resin (that is, the branch pipe portion 14 has a water faucet). A water faucet with an EF saddle may be used.

また、上で挙げた寸法などの具体的数値は、いずれも単なる一例であり、製品の仕様などの必要に応じて適宜変更可能である。   In addition, the specific numerical values such as the dimensions given above are merely examples, and can be appropriately changed according to the needs of product specifications and the like.

１０ …分岐サドル継手
１２ …サドル部
１２ａ …電熱線部
１２ｂ …第１コールドゾーン
１２ｃ …第２コールドゾーン
１４ …分岐管部
１００ …本管
１０２ …分岐管 DESCRIPTION OF SYMBOLS 10 ... Branch saddle joint 12 ... Saddle part 12a ... Heating wire part 12b ... 1st cold zone 12c ... 2nd cold zone 14 ... Branch pipe part 100 ... Main pipe 102 ... Branch pipe

Claims (4)

合成樹脂製の本管から分岐を取り出すために前記本管の外周面に電気融着接合される分岐サドル継手であって、
分岐孔を有する湾曲板状のサドル部、および
前記分岐孔の周縁部から立ち上がる分岐管部を備え、
前記分岐サドル継手を前記本管に載置した状態において前記サドル部の内周面と前記本管の外周面との間に隙間が形成されるように、前記サドル部は、前記本管の外径よりも小さい内径を有する、分岐サドル継手。 A branch saddle joint that is electrofused and joined to the outer peripheral surface of the main pipe to take out a branch from the main pipe made of synthetic resin,
A curved plate-shaped saddle portion having a branch hole, and a branch pipe portion rising from a peripheral portion of the branch hole,
The saddle portion is arranged outside the main pipe so that a gap is formed between the inner peripheral surface of the saddle portion and the outer peripheral surface of the main pipe in a state where the branch saddle joint is placed on the main pipe. A branch saddle joint with an inner diameter smaller than the diameter. 前記サドル部の周方向中心部における前記隙間の大きさは、５ｍｍ以上２５ｍｍ以下の範囲である、請求項１記載の分岐サドル継手。   The branch saddle joint according to claim 1, wherein a size of the gap in a circumferential center portion of the saddle portion is in a range of 5 mm to 25 mm. 前記本管の外周面に密着させたときの前記サドル部の内周面の中心角は、４５度以上１１０度以下の範囲である、請求項１または２記載の分岐サドル継手。   The branch saddle joint according to claim 1 or 2, wherein a center angle of an inner peripheral surface of the saddle portion when in close contact with the outer peripheral surface of the main pipe is in a range of 45 degrees to 110 degrees. 前記サドル部は、電熱線が埋設される電熱線部と、前記電熱線部の内側に配置される第１コールドゾーンと、前記電熱線部の外側に配置される第２コールドゾーンとを有し、
前記サドル部の中心角に対する前記第２コールドゾーンの中心角の割合は、１５％以上３５％以下の範囲である、請求項１ないし３のいずれかに記載の分岐サドル継手。 The saddle portion has a heating wire portion in which a heating wire is embedded, a first cold zone arranged inside the heating wire portion, and a second cold zone arranged outside the heating wire portion. ,
The branch saddle joint according to any one of claims 1 to 3, wherein a ratio of a center angle of the second cold zone to a center angle of the saddle portion is in a range of 15% to 35%.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3107666A1 (en) 2020-03-02 2021-09-03 Sainte Lizaigne Electrofusion system with saddle and support installation on pipe, multi-diameter and electrofusion pads

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JPH08240294A (en) * 1995-03-06 1996-09-17 Mitsubishi Plastics Ind Ltd Branched joint for electrically fused connection
JPH11170372A (en) * 1997-12-15 1999-06-29 Sekisui Chem Co Ltd Electrically welded branch joint
JP2007298146A (en) * 2006-05-02 2007-11-15 Sekisui Chem Co Ltd Jig for fixing branch-pipe

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JPH08240294A (en) * 1995-03-06 1996-09-17 Mitsubishi Plastics Ind Ltd Branched joint for electrically fused connection
JPH11170372A (en) * 1997-12-15 1999-06-29 Sekisui Chem Co Ltd Electrically welded branch joint
JP2007298146A (en) * 2006-05-02 2007-11-15 Sekisui Chem Co Ltd Jig for fixing branch-pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3107666A1 (en) 2020-03-02 2021-09-03 Sainte Lizaigne Electrofusion system with saddle and support installation on pipe, multi-diameter and electrofusion pads
WO2021175794A1 (en) 2020-03-02 2021-09-10 Sainte Lizaigne Electro-weldable system with saddle and on-pipe support facility that is multi-diameter with electrofusion pads

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