JP6050858B2

JP6050858B2 - Branch fitting

Info

Publication number: JP6050858B2
Application number: JP2015102368A
Authority: JP
Inventors: 原田　潤; 潤原田; 真基石川; 和規近藤; 井内　友昭; 友昭井内
Original assignee: 株式会社クボタケミックス
Priority date: 2015-05-20
Filing date: 2015-05-20
Publication date: 2016-12-21
Anticipated expiration: 2030-08-16
Also published as: JP2015145730A

Description

この発明は分岐管継手に関し、特にたとえば、ケーブルを収容して保護するケーブル保護管の本管と分岐管とを接続する、分岐管継手に関する。 The present invention relates to a branch pipe joint, and more particularly to a branch pipe joint for connecting a main pipe and a branch pipe of a cable protection pipe that accommodates and protects a cable.

従来、通信線や電力線などのケーブルを地中に埋設する際には、ケーブルを保護するためのケーブル保護管が用いられる。そして、建物内にケーブルを引き込むときのように、ケーブル保護管の本管に分岐管を接続する必要がある場合には、本管と分岐管とを接続するための分岐管継手が用いられる。 Conventionally, when a cable such as a communication line or a power line is buried in the ground, a cable protection tube for protecting the cable is used. When a branch pipe needs to be connected to the main pipe of the cable protection pipe, such as when a cable is drawn into the building, a branch pipe joint for connecting the main pipe and the branch pipe is used.

従来の分岐管継手の一例が特許文献１に開示されている。特許文献１の分岐管継手は、本管の外周面と略同一形状の内周面を有するサドル部と、サドル部から鋭角に分岐する枝管部（分岐管部）とを備える。そして、サドル部内面側には、本管の分岐孔（貫通孔）に沿うＵ字状の屈曲突出部が形成されている。この屈曲突出部は、本管の肉厚以上の突出高さとなるように、サドル部を陥没させることによって形成される。このような屈曲突出部を形成することによって、サドル部の開口（分岐管部の下部開口）と本管の分岐孔とを位置決めできると共に、本管から分岐管側へ挿通されるケーブルの損傷を防止することができる。
特許第２５３０９４１号 [Ｆ１６Ｌ４１／０２] An example of a conventional branch pipe joint is disclosed in Patent Document 1. The branch pipe joint of Patent Document 1 includes a saddle portion having an inner peripheral surface substantially the same shape as the outer peripheral surface of the main pipe, and a branch pipe portion (branch pipe portion) that branches at an acute angle from the saddle portion. A U-shaped bent protrusion along the branch hole (through hole) of the main pipe is formed on the inner surface side of the saddle portion. The bent protruding portion is formed by sinking the saddle portion so that the protruding height is greater than the thickness of the main pipe. By forming such a bent protrusion, the opening of the saddle part (lower opening of the branch pipe part) and the branch hole of the main pipe can be positioned, and damage to the cable inserted from the main pipe to the branch pipe side can be prevented. Can be prevented.
Patent No. 2530941 [F16L 41/02]

しかしながら、特許文献１では、分岐管継手を射出成形によって適切に製作しようとすることに関しては、何ら考慮されていない。However, Patent Document 1 does not take into consideration any attempt to appropriately manufacture the branch pipe joint by injection molding.

それゆえに、この発明の主たる目的は、新規な、分岐管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 pipe joint.

この発明の他の目的は、射出成形によって適切に製作でき、また、本管に対して適切に取り付けることができる、分岐管継手を提供することである。 Another object of the present invention is to provide a branch pipe joint that can be appropriately manufactured by injection molding and can be appropriately attached to the main pipe.

この発明は、上記の課題を解決するために、以下の構成を採用した。なお、括弧内の参照符号および補足説明などは、本発明の理解を助けるために後述する実施の形態との対応関係を示したものであって、この発明を何ら限定するものではない。 The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses and supplementary explanations indicate correspondence with embodiments described later in order to help understanding of the present invention, and do not limit the present invention.

第１の発明は、ケーブルを収容して保護するケーブル保護管の本管と分岐管とを接続する分岐管継手であって、本管の外面に密着して取り付けられるサドル部、サドル部の外面から突出し、サドル部を本管に取り付けた状態で本管の管軸に対して鋭角となる分岐角度を有する枝管部、サドル部の枝管部との連結部分に形成され、枝管部の内部と連通する開口、およびサドル部の内面から突出し、開口の周縁に沿って環状に形成される環状突起を備え、当該分岐管継手を射出成形するときの射出成形用金型のキャビティ内に合成樹脂を導入したゲート跡部が、周方向中央部であって、枝管部の分岐方向とは逆側の軸方向部分に形成されており、環状突起は、サドル部を内面側に陥没させることなく当該サドル部に肉厚の大きい厚肉部を設けることによって形成され、環状突起を形成した部分におけるサドル部の外面は、円筒面をなすように形成され、環状突起の枝管部分岐方向側の外周面は、傾斜面によって形成され、本管の管軸に対する傾斜面の傾斜角度は、枝管部の分岐角度以下に設定され、サドル部の外面の４隅には、本管の管軸を中心として枝管部の中心軸から８５°の位置に形成され、本管の天頂位置と合わせれば枝管部が水平方向から５°上向くようになる目印を備える、分岐管継手である。 A first invention is a branch pipe joint for connecting a main pipe and a branch pipe of a cable protection pipe that accommodates and protects a cable, the saddle section being attached in close contact with the outer surface of the main pipe, and the outer surface of the saddle section Projecting from the branch pipe part having an acute branch angle with respect to the pipe axis of the main pipe with the saddle part attached to the main pipe. An opening that communicates with the inside, and an annular protrusion that protrudes from the inner surface of the saddle portion and is formed annularly along the periphery of the opening, is synthesized in the cavity of the injection mold when the branch pipe joint is injection molded The gate trace part into which the resin is introduced is the central part in the circumferential direction, and is formed in the axial direction part opposite to the branching direction of the branch pipe part, and the annular protrusion does not cause the saddle part to sink into the inner surface side. A thick part with a large thickness should be provided in the saddle part. Formed by the outer surface of the saddle portion in the portion forming the annular projection is formed so as to form a cylindrical surface, the outer peripheral surface of the branch pipe portion branching direction side of the annular projection is formed by the inclined surface, the pipe of the main pipe The inclination angle of the inclined surface with respect to the shaft is set to be equal to or smaller than the branching angle of the branch pipe portion, and the four corners of the outer surface of the saddle portion are at 85 ° from the central axis of the branch pipe portion with the tube axis of the main pipe as the center. A branch pipe joint having a mark formed so that the branch pipe portion faces upward by 5 ° from the horizontal direction when aligned with the zenith position of the main pipe.

第１の発明では、分岐管継手（１０）は、サドル部（２０）および枝管部（２２）を含み、ケーブル保護管の本管（１２）に対して分岐管（１４）を接続するために用いられる。サドル部は、本管の外面と略同一形状の内面を有するたとえば半円筒状に形成され、枝管部は、本管の管軸に対して鋭角となる分岐角度でサドル部の外面から突出する。また、サドル部には、枝管部との連結部分に、枝管部の内部と連通する略楕円形状の開口（２４）が形成される。また、サドル部の内面には、開口の周縁に沿って環状に形成される環状突起（２６）が形成される。この環状突起は、サドル部を内面側に陥没させることなく当該サドル部に肉厚の大きい厚肉部を設けることによって形成され、環状突起を形成した部分におけるサドル部の外面は、円筒面をなすように形成される。さらに、分岐管継手を射出成形するときの射出成形用金型のキャビティ内に合成樹脂を導入したゲート跡部が、周方向中央部であって、枝管部の分岐方向とは逆側の軸方向部分に形成されている。さらにまた、環状突起の枝管部分岐方向側の外周面は、傾斜面によって形成され、本管の管軸に対する傾斜面の傾斜角度は、枝管部の分岐角度以下に設定される。そして、サドル部の外面の４隅には、本管の管軸を中心として枝管部の中心軸から８５°の位置において、目印（３２）が形成される。この目印を本管の天頂位置と合わせれば、枝管部が水平方向から５°上向くようになる。 In the first invention, the branch pipe joint (10) includes a saddle part (20) and a branch pipe part (22) for connecting the branch pipe (14) to the main pipe (12) of the cable protection pipe. Used for. The saddle portion is formed in, for example, a semi-cylindrical shape having an inner surface substantially the same shape as the outer surface of the main pipe, and the branch pipe portion projects from the outer surface of the saddle section at a branching angle that is an acute angle with respect to the tube axis of the main pipe. . Further, the saddle part is formed with a substantially elliptical opening (24) communicating with the inside of the branch pipe part at the connection part with the branch pipe part. Further, an annular protrusion (26) formed in an annular shape along the periphery of the opening is formed on the inner surface of the saddle portion. The annular projection is formed by providing a thick wall portion with a large thickness in the saddle portion without causing the saddle portion to be recessed on the inner surface side, and the outer surface of the saddle portion in the portion where the annular projection is formed forms a cylindrical surface. Formed as follows. Furthermore, the gate trace portion where the synthetic resin is introduced into the cavity of the injection mold when the branch pipe joint is injection-molded is the central portion in the circumferential direction, and the axial direction opposite to the branch direction of the branch pipe portion It is formed in the part. Furthermore, the outer peripheral surface of the annular projection on the branch pipe portion branching direction side is formed by an inclined surface, and the inclination angle of the inclined surface with respect to the tube axis of the main pipe is set to be equal to or less than the branch angle of the branch pipe portion. Marks (32) are formed at the four corners of the outer surface of the saddle portion at a position of 85 ° from the central axis of the branch pipe portion with the tube axis of the main pipe as the center. If this mark is aligned with the zenith position of the main pipe, the branch pipe portion will be 5 ° upward from the horizontal direction.

第１の発明によれば、射出した樹脂の流れが最適となると共に、射出成形する際に形成されるゲート跡部を、分岐管継手の勾配などを測定するため等に利用できるようになる。また、開口の周縁に沿って環状に形成される環状突起をサドル部の内面に形成したので、本管の分岐孔に環状突起を嵌め込むことによって、本管に対する分岐管継手の動きが確実に拘束される。したがって、分岐管継手を射出成形によって適切に製作でき、また、本管に対して分岐管継手を適切に取り付けることができる。さらに、サドル部の外面の４隅に目印を形成したので、枝管部の取付角度を正確に制御できる。 According to the first invention, the flow of the injected resin is optimal, the gate mark portion which is formed during the injection molding, made available in such order to measure such a gradient of the branch pipe joint. In addition, since the annular protrusion formed annularly along the periphery of the opening is formed on the inner surface of the saddle portion, the movement of the branch pipe joint with respect to the main pipe is ensured by fitting the annular protrusion into the branch hole of the main pipe. Be bound. Therefore, the branch pipe joint can be appropriately manufactured by injection molding, and the branch pipe joint can be appropriately attached to the main pipe. Further, since the marks are formed at the four corners of the outer surface of the saddle portion, the attachment angle of the branch pipe portion can be accurately controlled.

第２の発明は、ケーブルを収容して保護するケーブル保護管の本管と分岐管とを接続する分岐管継手であって、本管の外面に密着して取り付けられるサドル部、サドル部の外面から突出し、サドル部を本管に取り付けた状態で本管の管軸に対して鋭角となる分岐角度を有する枝管部、サドル部の枝管部との連結部分に形成され、枝管部の内部と連通する開口、およびサドル部の内面から突出し、開口の周縁に沿って環状に形成される環状突起を備え、当該分岐管継手を射出成形するときの射出成形用金型のキャビティ内に合成樹脂を導入したゲート跡部が、周方向中央部であって、枝管部の分岐方向とは逆側の軸方向部分に形成されており、環状突起は、サドル部を内面側に陥没させることなく当該サドル部に肉厚の大きい厚肉部を設けることによって形成され、かつ、開口の周縁に沿って断続的に形成される断続的環状突起とされ、環状突起を形成した部分におけるサドル部の外面は、円筒面をなすように形成され、環状突起の枝管部分岐方向側の外周面は、傾斜面によって形成され、本管の管軸に対する傾斜面の傾斜角度は、枝管部の分岐角度以下に設定され、サドル部の外面の４隅には、本管の管軸を中心として枝管部の中心軸から８５°の位置に形成され、本管の天頂位置と合わせれば枝管部が水平方向から５°上向くようになる目印を備える、分岐管継手である。 A second invention is a branch pipe joint for connecting a main pipe and a branch pipe of a cable protection pipe that accommodates and protects a cable, the saddle section being attached in close contact with the outer surface of the main pipe, and the outer surface of the saddle section Projecting from the branch pipe part having an acute branch angle with respect to the pipe axis of the main pipe with the saddle part attached to the main pipe. An opening that communicates with the inside, and an annular protrusion that protrudes from the inner surface of the saddle portion and is formed annularly along the periphery of the opening, is synthesized in the cavity of the injection mold when the branch pipe joint is injection molded The gate trace part into which the resin is introduced is the central part in the circumferential direction, and is formed in the axial direction part opposite to the branching direction of the branch pipe part, and the annular protrusion does not cause the saddle part to sink into the inner surface side. A thick part with a large thickness should be provided in the saddle part. Formed by, and is an intermittent annular projection intermittently formed along the periphery of the opening, the outer surface of the saddle portion in the portion forming the annular projection is formed so as to form a cylindrical surface, the annular projection The outer peripheral surface of the branch pipe portion branching direction side is formed by an inclined surface, and the inclination angle of the inclined surface with respect to the tube axis of the main pipe is set to be equal to or smaller than the branch angle of the branch pipe portion, and is provided at the four corners of the outer surface of the saddle portion. The branch is formed at a position of 85 ° from the central axis of the branch pipe portion around the tube axis of the main pipe, and has a mark that the branch pipe portion faces upward by 5 ° from the horizontal direction when combined with the zenith position of the main pipe. It is a pipe joint.

第２の発明によれば、第１の発明と同様に、分岐管継手を射出成形によって適切に製作でき、また、本管に対して分岐管継手を適切に取り付けることができる。さらに、枝管部の取付角度を正確に制御できる。According to the second invention, similarly to the first invention, the branch pipe joint can be appropriately manufactured by injection molding, and the branch pipe joint can be appropriately attached to the main pipe. Furthermore, the attachment angle of the branch pipe part can be accurately controlled.

第３の発明は、ケーブルを収容して保護するケーブル保護管の本管と分岐管とを接続する分岐管継手であって、本管の外面に密着して取り付けられるサドル部、サドル部の外面から突出し、サドル部を本管に取り付けた状態で本管の管軸に対して鋭角となる分岐角度を有する枝管部、サドル部の枝管部との連結部分に形成され、枝管部の内部と連通する開口、およびサドル部の内面から突出し、開口の周縁に形成される突起を備え、突起の枝管部分岐方向側の外周面は、傾斜面によって形成され、本管の管軸に対する傾斜面の傾斜角度は、枝管部の分岐角度以下に設定され、当該分岐管継手を射出成形するときの射出成形用金型のキャビティ内に合成樹脂を導入したゲート跡部が、周方向中央部であって、枝管部の分岐方向とは逆側の軸方向部分に形成されている、分岐管継手である。A third invention is a branch pipe joint that connects a main pipe and a branch pipe of a cable protection pipe that accommodates and protects a cable, and is attached in close contact with the outer surface of the main pipe, and the outer surface of the saddle section Projecting from the branch pipe part having an acute branch angle with respect to the pipe axis of the main pipe with the saddle part attached to the main pipe. An opening that communicates with the inside and a protrusion that protrudes from the inner surface of the saddle portion and is formed on the periphery of the opening, and an outer peripheral surface on the branch pipe portion branching direction side of the protrusion is formed by an inclined surface, and is formed with respect to the tube axis of the main pipe The inclination angle of the inclined surface is set to be equal to or less than the branching angle of the branch pipe part, and the gate trace part in which the synthetic resin is introduced into the cavity of the injection mold when the branch pipe joint is injection-molded is the central part in the circumferential direction. The axial direction opposite to the branching direction of the branch pipe part Is formed in a minute, it is a branch pipe joint.

第４の発明は、ケーブルを収容して保護するケーブル保護管の本管と分岐管とを接続する分岐管継手であって、本管の外面に密着して取り付けられるサドル部、サドル部の外面から突出し、サドル部を本管に取り付けた状態で本管の管軸に対して鋭角となる分岐角度を有する枝管部、サドル部の枝管部との連結部分に形成され、枝管部の内部と連通する開口、およびサドル部の内面から突出し、開口の周縁に形成される突起を備え、突起の枝管部分岐方向側の外周面は、傾斜面によって形成され、本管の管軸に対する傾斜面の傾斜角度は、枝管部の分岐角度以下に設定され、サドル部の外面には、本管の管軸を中心として枝管部の中心軸から８５°の位置に形成され、本管の天頂位置と合わせれば枝管部が水平方向から５°上向くようになる目印を備える、分岐管継手である。4th invention is a branch pipe joint which connects the main pipe and branch pipe of the cable protection pipe which accommodates and protects a cable, Comprising: The saddle part closely attached to the outer surface of a main pipe, The outer surface of a saddle part Projecting from the branch pipe part having an acute branch angle with respect to the pipe axis of the main pipe with the saddle part attached to the main pipe. An opening that communicates with the inside and a protrusion that protrudes from the inner surface of the saddle portion and is formed on the periphery of the opening, and an outer peripheral surface on the branch pipe portion branching direction side of the protrusion is formed by an inclined surface, The inclination angle of the inclined surface is set to be equal to or less than the branching angle of the branch pipe portion, and the outer surface of the saddle portion is formed at a position of 85 ° from the central axis of the branch pipe portion around the main pipe axis. Eye that the branch pipe part will be 5 degrees upward from the horizontal direction when it is aligned with the zenith position of It is a branch pipe joint provided with a mark.

この発明によれば、射出した樹脂の流れが最適となると共に、射出成形する際に形成されるゲート跡部を、分岐管継手の勾配などを測定するため等に利用できるようになる。また、開口の周縁に沿って環状に形成される環状突起をサドル部の内面に形成したので、本管の分岐孔に環状突起を嵌め込むことによって、本管に対する分岐管継手の動きが確実に拘束される。したがって、分岐管継手を射出成形によって適切に製作でき、また、本管に対して分岐管継手を適切に取り付けることができる。さらに、サドル部の外面の４隅に目印を形成したので、枝管部の取付角度を正確に制御できる。 According to the invention, with the flow of the injected resin is optimal, the gate mark portion which is formed during the injection molding, made available in such order to measure such a gradient of the branch pipe joint. In addition, since the annular protrusion formed annularly along the periphery of the opening is formed on the inner surface of the saddle portion, the movement of the branch pipe joint with respect to the main pipe is ensured by fitting the annular protrusion into the branch hole of the main pipe. Be bound. Therefore, the branch pipe joint can be appropriately manufactured by injection molding, and the branch pipe joint can be appropriately attached to the main pipe. Further, since the marks are formed at the four corners of the outer surface of the saddle portion, the attachment angle of the branch pipe portion can be accurately controlled.

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管継手を用いて本管と分岐管とを接続した様子を示す断面図である。It is sectional drawing which shows a mode that the main pipe and the branch pipe were connected using the branch pipe coupling which is one Example of this invention. 図１の分岐管継手の外観を示す図解図である。It is an illustration figure which shows the external appearance of the branch pipe coupling of FIG. 図１の分岐管継手のサドル部内面側を示す図解図である。It is an illustration figure which shows the saddle part inner surface side of the branch pipe coupling of FIG. 図１の分岐管継手のサドル部の形状を説明するための図解図であり、（Ａ）は分岐管継手を軸方向に見た外観を示し、（Ｂ）は分岐管継手を幅方向に見た外観を示す。FIG. 2 is an illustrative view for explaining the shape of a saddle portion of the branch pipe joint of FIG. 1, (A) shows an appearance of the branch pipe joint viewed in the axial direction, and (B) shows the branch pipe joint viewed in the width direction. Appearance is shown. 図１の分岐管継手を本管に取り付けた様子を示す図解図である。It is an illustration figure which shows a mode that the branch pipe coupling of FIG. 1 was attached to the main pipe. 本管に分岐孔を形成したときの形状変化の様子を説明するための図解図であり、（Ａ）は分岐孔を形成する前の本管を示し、（Ｂ）は分岐孔を形成した後の本管を示す。It is an illustration for demonstrating the mode of a shape change when a branch hole is formed in a main pipe, (A) shows the main pipe before forming a branch hole, (B) after forming a branch hole The main is shown.

図１を参照して、この発明の一実施例である分岐管継手１０は、ケーブル保護管の本管１２に対して分岐管１４を接続するために用いられる。ケーブル保護管は、地中に埋設される通信線や電力線などのケーブル１６を内部に収容し、ケーブル１６を保護するための管であり、本管１２、分岐管１４、およびこれらを接続する分岐管継手１０などによって構成される。本管１２は、たとえば道路に沿って地中に埋設される管であり、分岐管１４は、たとえば本管１２から分岐して建物内まで延びる管である。本管１２および分岐管１４は、硬質塩化ビニル樹脂などの合成樹脂によって形成される。 Referring to FIG. 1, a branch pipe joint 10 according to an embodiment of the present invention is used to connect a branch pipe 14 to a main pipe 12 of a cable protection pipe. The cable protection tube is a tube for accommodating the cable 16 such as a communication line and a power line embedded in the ground and protecting the cable 16. The main pipe 12, the branch pipe 14, and the branch connecting them. It is comprised by the pipe joint 10 grade | etc.,. The main pipe 12 is a pipe buried in the ground along the road, for example, and the branch pipe 14 is a pipe branched from the main pipe 12 and extended into the building, for example. The main pipe 12 and the branch pipe 14 are formed of a synthetic resin such as a hard vinyl chloride resin.

図２および３に示すように、分岐管継手１０は、本管１２の外面に密着して取り付けられるサドル部２０と、サドル部２０の外面から鋭角に突出する枝管部２２とを含み、硬質塩化ビニル樹脂などの合成樹脂によって形成される。 As shown in FIGS. 2 and 3, the branch pipe joint 10 includes a saddle part 20 that is attached in close contact with the outer surface of the main pipe 12, and a branch pipe part 22 that projects at an acute angle from the outer surface of the saddle part 20. It is formed of a synthetic resin such as vinyl chloride resin.

具体的には、サドル部２０は、本管１２の外面と略同一形状の内面を有する半円筒状に形成される。サドル部２０の軸方向長さは、たとえば５００ｍｍである。枝管部２２は、短直管状に形成され、サドル部２０（分岐管継手１０）を本管１２に取り付けた状態で、本管１２の管軸方向に対して鋭角に延びる。本管１２に対する枝管部２２の分岐角度（取り出し角度）は、ケーブル１６の引込作業が円滑に行える角度に設定され、たとえば２５〜５０°に設定される。また、枝管部２２の鈍角側部分（図１および２において上側の部分）は、通線されるケーブル１６の許容曲率半径に応じた所定の曲率半径で湾曲される。この実施例では、枝管部２２の分岐角度は、４５°であり、枝管部２２の鈍角側部分の内面の曲率半径は、３００ｍｍである。 Specifically, the saddle portion 20 is formed in a semi-cylindrical shape having an inner surface substantially the same shape as the outer surface of the main pipe 12. The axial length of the saddle portion 20 is, for example, 500 mm. The branch pipe part 22 is formed in a short tubular shape, and extends at an acute angle with respect to the pipe axis direction of the main pipe 12 in a state where the saddle part 20 (branch pipe joint 10) is attached to the main pipe 12. The branching angle (extraction angle) of the branch pipe portion 22 with respect to the main pipe 12 is set to an angle at which the cable 16 can be smoothly pulled in, for example, 25 to 50 °. Further, the obtuse angle side portion (the upper portion in FIGS. 1 and 2) of the branch pipe portion 22 is curved with a predetermined curvature radius corresponding to the allowable curvature radius of the cable 16 to be passed. In this embodiment, the branching angle of the branch pipe part 22 is 45 °, and the radius of curvature of the inner surface of the obtuse angle side portion of the branch pipe part 22 is 300 mm.

また、サドル部２０には、枝管部２２との連結部分に略楕円形状の開口２４が形成される。開口２４は、枝管部２２の内部と連通しており、開口２４の周縁は、枝管部２２の内面と滑らかに連結される。 Further, the saddle portion 20 is formed with a substantially elliptical opening 24 at a connection portion with the branch pipe portion 22. The opening 24 communicates with the inside of the branch pipe part 22, and the periphery of the opening 24 is smoothly connected to the inner surface of the branch pipe part 22.

さらに、サドル部２０の内面には、開口２４の周縁に沿って環状に形成される、つまり開口２４全周に亘って延びる環状突起２６が形成される。環状突起２６の内周面は、開口２４の周縁と滑らかに連結され、環状突起２６の外縁（外周面基端部）は、平面視で軸方向両側が非対称の略角丸矩形状を有する。また、環状突起２６は、サドル部２０の肉厚を大きくする、つまりサドル部２０に厚肉部を形成することによって形成され、環状突起２６を形成した部分におけるサドル部２０外面は、円筒面をなすように形成される（図１参照）。すなわち、サドル部２０外面には、環状突起２６を形成した部分においても、内面側に陥没する凹部は形成されない。また、環状突起２６の突出高さは、本管１２の肉厚とほぼ同じ、或いは本管１２の肉厚よりも少し（たとえば１ｍｍ程度）大きくなるように設定される。つまり、環状突起２６の突出高さは、サドル部２０を本管１２に取り付けた状態で、本管１２の内面とほぼ同じ高さになるように、或いは本管１２の内面から少し突出するように設定される。 Furthermore, an annular protrusion 26 is formed on the inner surface of the saddle portion 20 in an annular shape along the periphery of the opening 24, that is, extending over the entire periphery of the opening 24. The inner peripheral surface of the annular protrusion 26 is smoothly connected to the peripheral edge of the opening 24, and the outer edge (outer peripheral surface base end portion) of the annular protrusion 26 has a substantially rounded rectangular shape in which both sides in the axial direction are asymmetric in plan view. The annular protrusion 26 is formed by increasing the thickness of the saddle portion 20, that is, by forming a thick portion in the saddle portion 20, and the outer surface of the saddle portion 20 in the portion where the annular protrusion 26 is formed has a cylindrical surface. (See FIG. 1). That is, a recess that is recessed toward the inner surface side is not formed on the outer surface of the saddle portion 20 even in the portion where the annular protrusion 26 is formed. Further, the projecting height of the annular protrusion 26 is set to be substantially the same as the thickness of the main pipe 12 or slightly larger (for example, about 1 mm) than the thickness of the main pipe 12. That is, the projecting height of the annular protrusion 26 is substantially the same as the inner surface of the main pipe 12 in a state where the saddle portion 20 is attached to the main pipe 12 or slightly protrudes from the inner surface of the main pipe 12. Set to

また、図１を参照して、環状突起２６は、本管１２軸方向における一方側（枝管部２２の分岐方向と逆側）の部分２６ａにおいて幅広に形成され、本管１２軸方向における他方側（枝管部２２の分岐方向側）の部分２６ｂにおいて幅狭に形成される。そして、環状突起２６の一方側部分２６ａは、その内周面基端部から頂上部にかけて、枝管部２２の鈍角側部分の内面と同じ曲率半径で湾曲するように形成される。つまり、環状突起２６の一方側部分２６ａにおいては、枝管部２２の内面、開口２４の周縁、および環状突起２６の内周面に亘って所定の曲率半径で湾曲され、これによって、ケーブル１６の引込作業が円滑に行えるようにされる。また、環状突起２６の一方側部分２６ａの外周面上部から頂上部にかけての部分は曲面で形成され、これによって、本管１２の内面から環状突起２６が突出する場合であっても、環状突起２６によってケーブル１６が傷つけられることはない。 Referring to FIG. 1, the annular protrusion 26 is formed wide at a portion 26 a on one side in the main pipe 12 axial direction (opposite to the branching direction of the branch pipe portion 22), and the other in the main pipe 12 axial direction. A narrow portion is formed in a portion 26b on the side (branch direction side of the branch pipe portion 22). The one side portion 26 a of the annular protrusion 26 is formed so as to be curved with the same radius of curvature as the inner surface of the obtuse angle side portion of the branch pipe portion 22 from the inner peripheral surface proximal end portion to the top portion. That is, the one side portion 26 a of the annular protrusion 26 is curved with a predetermined radius of curvature over the inner surface of the branch pipe portion 22, the peripheral edge of the opening 24, and the inner peripheral surface of the annular protrusion 26. The pull-in operation can be performed smoothly. Further, a portion from the upper part of the outer peripheral surface to the top of the one side portion 26a of the annular protrusion 26 is formed as a curved surface, whereby even when the annular protrusion 26 protrudes from the inner surface of the main pipe 12, the annular protrusion 26 is formed. Will not damage the cable 16.

一方、環状突起２６の他方側部分２６ｂでは、その内周面は、枝管部２２の鋭角側部分の内面と同じ方向に突出することなく、曲面（たとえば、曲率半径が１２ｍｍ）で滑らかに落とし込まれており、これによって、開口２４の大きさが確保される。 On the other hand, the inner peripheral surface of the other side portion 26b of the annular protrusion 26 is smoothly projected with a curved surface (for example, a radius of curvature of 12 mm) without protruding in the same direction as the inner surface of the acute angle side portion of the branch pipe portion 22. Thus, the size of the opening 24 is secured.

また、環状突起２６の他方側部分２６ｂでは、その外周面が傾斜面２８によって形成される。本管１２の管軸に対する傾斜面２８の傾斜角度は、枝管部２２の分岐角度以下であって、かつ概略２５°以上である角度範囲に設定される。これは、傾斜面２８の傾斜角度が枝管部２２の分岐角度より大きいと、分岐管継手１０を射出成形する際に、分岐管継手１０から金型を取り外すことが困難になってしまうからである。また、傾斜面２８の傾斜角度が概略２５°より小さいと、本管１２に形成した分岐孔１８に環状突起２６を嵌め込んだ際に、分岐孔１８の周縁に環状突起２６が引っ掛かり難くなり、分岐管継手１０の軸方向の動きを適切に拘束できないからである。さらに、傾斜面２８の傾斜角度を小さくすると、突起部２６の他方側部分２６ｂの幅が大きくなるので、サドル部２６内面の本管１２外面との接着面積が小さくなってしまう、或いは接着面積を確保するためにサドル部２０の軸方向長さを大きくする必要が生じる。このため、傾斜面２８の傾斜角度は、射出成形する際に金型を容易に取り外せる範囲内で、なるべく大きく設定することが好ましい。この実施例では、傾斜面２８の傾斜角度は、枝管部２２の分岐角度と同じである４５°に設定されている。 In addition, an outer peripheral surface of the other side portion 26 b of the annular protrusion 26 is formed by an inclined surface 28. The inclination angle of the inclined surface 28 with respect to the tube axis of the main pipe 12 is set to an angle range that is equal to or smaller than the branch angle of the branch pipe portion 22 and approximately equal to or greater than 25 °. This is because if the inclination angle of the inclined surface 28 is larger than the branching angle of the branch pipe portion 22, it becomes difficult to remove the mold from the branch pipe joint 10 when the branch pipe joint 10 is injection molded. is there. If the inclined angle of the inclined surface 28 is smaller than approximately 25 °, the annular protrusion 26 is not easily caught on the periphery of the branch hole 18 when the annular protrusion 26 is fitted into the branch hole 18 formed in the main pipe 12. This is because the axial movement of the branch pipe joint 10 cannot be properly restrained. Further, when the inclination angle of the inclined surface 28 is reduced, the width of the other side portion 26b of the projection 26 is increased, so that the adhesion area between the inner surface of the saddle portion 26 and the outer surface of the main pipe 12 is reduced or the adhesion area is reduced. In order to ensure, it is necessary to increase the axial length of the saddle portion 20. For this reason, it is preferable to set the inclination angle of the inclined surface 28 as large as possible within a range in which the mold can be easily removed during injection molding. In this embodiment, the inclination angle of the inclined surface 28 is set to 45 °, which is the same as the branch angle of the branch pipe portion 22.

また、サドル部２０の外面の周方向両側には、周方向に延びる一対の突起３０ａ,ｂが
形成される。この一対の突起３０ａ,ｂは、たとえばサドル部２０の軸方向両端部および
枝管部２２の基端部近傍に配置される。分岐管継手１０を本管１２に取り付ける際には、この一対の突起３０ａ,ｂ間（図４に示す２０ｂおよび２０ｃの部分）に固定バンドが装
着される。この一対の突起３０ａ,ｂを形成することによって、固定バンドの位置決めを
正確に行うことができ、固定バンドのずれは防止される。 A pair of protrusions 30a and 30b extending in the circumferential direction are formed on both sides of the outer surface of the saddle portion 20 in the circumferential direction. The pair of protrusions 30 a and 30 b are disposed, for example, in the vicinity of both end portions in the axial direction of the saddle portion 20 and the proximal end portion of the branch pipe portion 22. When the branch pipe joint 10 is attached to the main pipe 12, a fixing band is attached between the pair of protrusions 30a and 30b (portions 20b and 20c shown in FIG. 4). By forming the pair of protrusions 30a, 30b, the fixing band can be accurately positioned, and the fixing band is prevented from being displaced.

さらに、サドル部２０の外面の４隅には、軸方向に延びる突起３２が形成される。この突起３２は、サドル部２０の周方向側縁から所定距離の位置、すなわち本管１２の管軸を中心として所定角度を有する位置に配置される。この実施例の突起３２は、本管１２の管軸を中心として枝管部２２の中心軸から８５°の位置に形成されている。分岐管継手１０を本管１２に取り付ける際に、本管１２の天頂位置と突起３２の位置とを合わせれば、枝管部２２（延いては分岐管１４）が水平方向から所定角度（５°）上向くようになる。すなわち、突起３２を目印とすることによって、枝管部２２の取付角度を正確に制御できる。 Further, projections 32 extending in the axial direction are formed at the four corners of the outer surface of the saddle portion 20. The protrusion 32 is disposed at a position at a predetermined distance from the circumferential side edge of the saddle portion 20, that is, at a position having a predetermined angle around the tube axis of the main pipe 12. The protrusion 32 of this embodiment is formed at a position of 85 ° from the central axis of the branch pipe portion 22 with the pipe axis of the main pipe 12 as the center. When the branch pipe joint 10 is attached to the main pipe 12, if the zenith position of the main pipe 12 and the position of the protrusion 32 are matched, the branch pipe portion 22 (and hence the branch pipe 14) has a predetermined angle (5 °) from the horizontal direction. ) Comes up. That is, the mounting angle of the branch pipe portion 22 can be accurately controlled by using the protrusion 32 as a mark.

このような分岐管継手１０を本管１２に取り付ける際には、本管１２に分岐孔１８を形成した後、本管１２外面とサドル部２０内面とを密着させて接着接合する。従来の分岐管継手では、サドル部２０の内径（内面の曲率半径）は、分岐孔１８を形成する前の本管１２の外径に合わせて設定され、サドル部２０内面の側縁部間の距離は、軸方向全体に亘って一様に設定されていた。しかし、本管１２の分岐孔１８を形成した部分は、押出成形時の残留応力によって縮径し、分岐孔１８を形成していない部分と比較して外径が小さくなる。特に、分岐孔１８を軸方向に延びる長円状に穿孔する場合には、この傾向が顕著となり、分岐孔１８の軸方向（長手方向）中央近傍の部分における本管１２の外径が最も小さくなる（図６参照）。このため、従来の分岐管継手では、分岐孔１８を形成した本管１２の軸方向位置において、本管１２外面とサドル部２０内面との間に隙間（浮き）が生じてしまうという問題があった。 When attaching such a branch pipe joint 10 to the main pipe 12, after forming the branch hole 18 in the main pipe 12, the outer surface of the main pipe 12 and the inner surface of the saddle portion 20 are adhered and bonded together. In the conventional branch pipe joint, the inner diameter (the radius of curvature of the inner surface) of the saddle portion 20 is set according to the outer diameter of the main pipe 12 before the branch hole 18 is formed, and between the side edges of the inner surface of the saddle portion 20. The distance was set uniformly over the entire axial direction. However, the diameter of the portion of the main pipe 12 where the branch hole 18 is formed is reduced by the residual stress at the time of extrusion molding, and the outer diameter is smaller than the portion where the branch hole 18 is not formed. In particular, when the branch hole 18 is drilled in the shape of an ellipse extending in the axial direction, this tendency becomes remarkable, and the outer diameter of the main pipe 12 in the portion near the center in the axial direction (longitudinal direction) of the branch hole 18 is the smallest. (See FIG. 6). For this reason, the conventional branch pipe joint has a problem that a gap (floating) is generated between the outer surface of the main pipe 12 and the inner surface of the saddle portion 20 at the axial position of the main pipe 12 in which the branch hole 18 is formed. It was.

そこで、この実施例では、本管１２の分岐孔１８の軸方向中央近傍の部分に対応するサドル部２０の軸方向部分、つまり枝管部２２が突出する軸方向部分（枝管部突出部分）の軸方向中央近傍におけるサドル部２０内面の側縁部間の距離を、枝管部突出部分より軸方向外側部分における距離より小さくしている。すなわち、この実施例の分岐管継手１０では、枝管部突出部分において、サドル部２０を縮径し、サドル部２０内面の曲率半径を小さくしている。 Therefore, in this embodiment, the axial portion of the saddle portion 20 corresponding to the portion in the vicinity of the axial center of the branch hole 18 of the main pipe 12, that is, the axial portion from which the branch pipe portion 22 protrudes (the branch pipe portion protruding portion). The distance between the side edge portions of the inner surface of the saddle portion 20 in the vicinity of the center in the axial direction is made smaller than the distance in the axially outer portion from the protruding portion of the branch pipe portion. That is, in the branch pipe joint 10 of this embodiment, the saddle portion 20 is reduced in diameter at the branch pipe portion protruding portion, and the curvature radius of the inner surface of the saddle portion 20 is reduced.

具体的には、図４を参照して、枝管部２２基端部の軸方向両端２２ａより軸方向内側の部分であるサドル部２０の部分を枝管部突出部分２０ａとすると、枝管部突出部分２０ａより外側部分におけるサドル部２０内面の側縁部間距離Ｗは、分岐孔１８を形成する前の本管１２の外径に合わせて設定され、枝管部突出部分２０ａにおけるサドル部２０内面の側縁部間距離Ｗは、本管１２の縮径に合わせて設定される。枝管部突出部分２０ａとその外側部分とは滑らかに連続するので、枝管部突出部分２０ａの軸方向中央近傍におけるサドル部２０内面の側縁部間距離Ｗは、その外側部分の側縁部間距離Ｗより小さくなる。たとえば、枝管部突出部分２０ａの軸方向中央近傍、つまり分岐孔１８および開口２４の軸方向中央近傍の部分に対応するサドル部２０の部分において、側縁部間距離Ｗが最も小さくされる。そして、枝管部突出部分２０ａの軸方向中央近傍から外側に向かうに従い、側縁部間距離Ｗは徐々に大きくされて、枝管部突出部分２０ａの内面とその外側部分の内面とは滑らかに連結される。 Specifically, referring to FIG. 4, when a portion of the saddle portion 20 that is an axially inner portion of the base end portion 22a of the branch pipe portion 22 is defined as a branch pipe portion protruding portion 20a, the branch pipe portion The distance W between the side edges of the inner surface of the saddle portion 20 at the outer portion from the protruding portion 20a is set according to the outer diameter of the main pipe 12 before the branch hole 18 is formed, and the saddle portion 20 at the branch tube protruding portion 20a. The distance W between the side edges of the inner surface is set in accordance with the diameter reduction of the main pipe 12. Since the branch pipe portion projecting portion 20a and the outer portion thereof are smoothly continuous, the distance W between the side edges of the inner surface of the saddle portion 20 near the axial center of the branch tube portion projecting portion 20a is the side edge portion of the outer portion. It becomes smaller than the distance W. For example, the distance W between the side edges is minimized in the vicinity of the center in the axial direction of the branch pipe projecting portion 20a, that is, in the saddle portion 20 corresponding to the portion in the vicinity of the center in the axial direction of the branch hole 18 and the opening 24. The distance W between the side edges is gradually increased from the vicinity of the axial center of the branch pipe projecting portion 20a toward the outside, and the inner surface of the branch pipe projecting portion 20a and the inner surface of the outer portion thereof are smooth. Connected.

枝管部突出部分２０ａの側縁部間距離Ｗを小さくする程度は、分岐管継手１０が接続する本管１２や分岐管１４（分岐孔１８）の大きさ等によって適宜設定される。たとえば、内径１５０ｍｍの本管１２と内径７５ｍｍの分岐管１４とを接続する分岐管継手１０の場合には、側縁部間距離Ｗは、最も小さくする部分（枝管部突出部分２０ａの軸方向中央近傍）で、外側部分と比較して０．５−５．０ｍｍ小さくされる。 The extent to which the distance W between the side edges of the branch pipe projecting portion 20a is reduced is appropriately set depending on the size of the main pipe 12 and the branch pipe 14 (branch hole 18) to which the branch pipe joint 10 is connected. For example, in the case of the branch pipe joint 10 that connects the main pipe 12 with an inner diameter of 150 mm and the branch pipe 14 with an inner diameter of 75 mm, the distance W between the side edges is the smallest part (the axial direction of the branch pipe part projecting part 20a). In the vicinity of the center), the outer portion is reduced by 0.5 to 5.0 mm.

側縁部間距離Ｗは、成形誤差により多少のばらつきが生じる可能性はあるが、この実施例では、少なくとも、枝管部突出部分２０ａの軸方向中央近傍におけるサドル部２０内面の側縁部間距離Ｗを、サドル部２０両端部の固定バンド取付位置２０ｂ、或いは固定バン
ドを取付可能な位置範囲の側縁部間距離Ｗより小さくしている。本管１２外面とサドル部２０内面とを接着接合する際には、固定バンドを用いてサドル部２０外面を締め付けるため、固定バンドの取付位置２０ｂにおいては、寸法許容差内の寸法誤差によって生じる隙間程度であれば吸収される。しかし、サドル部２０の枝管部突出部分２０ａには、枝管部２２が邪魔となって固定バンドを取り付けることができないため、枝管部突出部分２０ａの軸方向中央近傍における側縁部間距離Ｗを予め小さくしておくことにより、本管１２外面とサドル部２０内面との間の隙間の発生を防止するのである。 Although the distance W between the side edges may vary somewhat due to molding errors, in this embodiment, at least between the side edges of the inner surface of the saddle portion 20 near the center in the axial direction of the branch pipe portion protruding portion 20a. The distance W is set to be smaller than the fixed band mounting position 20b at both ends of the saddle portion 20 or the distance W between the side edges of the position range where the fixed band can be mounted. When the outer surface of the main pipe 12 and the inner surface of the saddle portion 20 are bonded and bonded, the outer surface of the saddle portion 20 is tightened using a fixed band. Therefore, a gap generated due to a dimensional error within a dimensional tolerance at the mounting position 20b of the fixed band. It is absorbed if it is about. However, since the branch pipe part 22 cannot be attached to the branch pipe projecting part 20a of the saddle part 20 and a fixing band cannot be attached, the distance between the side edges in the vicinity of the center in the axial direction of the branch pipe part projecting part 20a. By preliminarily reducing W, the occurrence of a gap between the outer surface of the main pipe 12 and the inner surface of the saddle portion 20 is prevented.

また、サドル部２０の端縁２０ｄ近傍（たとえば端縁２０ｄから３０−５０ｍｍまでの部分）は、本管１２に対してサドル部２０をバランス良く押さえ付けることや、取付作業性などを考慮すると、固定バンドの取付位置としては適さない。このため、サドル部２０の端縁２０ｄ近傍においては、寸法誤差などによって本管１２外面とサドル部２０内面との間に隙間が生じた場合、隙間がそのまま残る可能性がある。そこで、この実施例では、成形誤差によって側縁部間距離Ｗに多少のばらつきが生じることもあり得るが、少なくとも端縁２０ｄにおけるサドル部２０内面の側縁部間距離Ｗを、固定バンド取付位置２０ｂにおけるサドル部２０内面の側縁部間距離Ｗより小さくして、両者の内面が滑らかに連続するようにしている。たとえば、端縁２０ｄ近傍では、端縁２０ｄにおいて側縁部間距離Ｗが最も小さくされ、端縁から内側に向かうに従い側縁部間距離Ｗは徐々に大きくされる。端縁２０ｄ近傍の側縁部間距離Ｗを小さくする程度は、本管１２の大きさ等によって適宜設定されるが、固定バンド取付位置２０ｂと比較して、最も小さくする部分（端縁２０ｄ）でたとえば０．５−３．０ｍｍ小さくされる。 Further, in the vicinity of the edge 20d of the saddle portion 20 (for example, a portion from the edge 20d to 30-50 mm), in consideration of pressing the saddle portion 20 against the main pipe 12 in a well-balanced manner and mounting workability, It is not suitable for the mounting position of the fixed band. For this reason, in the vicinity of the edge 20d of the saddle portion 20, when a gap is generated between the outer surface of the main pipe 12 and the inner surface of the saddle portion 20 due to a dimensional error or the like, the gap may remain as it is. Therefore, in this embodiment, there may be some variation in the distance W between the side edges due to molding errors, but at least the distance W between the side edges of the inner surface of the saddle portion 20 at the end edge 20d is determined as the fixed band mounting position. It is made smaller than the distance W between the side edges of the inner surface of the saddle portion 20 at 20b so that the inner surfaces of both sides are smoothly continuous. For example, in the vicinity of the edge 20d, the distance W between the side edges is minimized at the edge 20d, and the distance W between the edges is gradually increased from the edge toward the inside. The extent to which the distance W between the side edges in the vicinity of the edge 20d is appropriately set depending on the size of the main pipe 12, etc., but the portion to be made the smallest (the edge 20d) as compared with the fixed band mounting position 20b. For example, it is reduced by 0.5 to 3.0 mm.

このような分岐管継手１０を製作する方法は、特に限定されないが、射出成形などを利用することができる。たとえば、先ず、サドル部内面の側縁部間距離が軸方向全体に亘って一様の分岐管継手を射出成形または２次加工によって成形する。その後、成形した分岐管継手のサドル部を加熱すると共に、サドル部の枝管部突出部分の軸方向中央部およびサドル部端縁の側縁部を外面側から押圧して、その部分の側縁部間距離を小さくすることによって、分岐管継手１０を製作するとよい。なお、サドル部への押圧加工は、たとえば射出成形用金型を取り外した直後である分岐管継手がまだ軟化状態にある間に実行すれば、別途の加熱処理を省略できるので、分岐管継手１０を容易に製作できる。 A method for manufacturing such a branch pipe joint 10 is not particularly limited, but injection molding or the like can be used. For example, first, a branch pipe joint in which the distance between the side edges of the inner surface of the saddle portion is uniform over the entire axial direction is formed by injection molding or secondary processing. Thereafter, the saddle portion of the formed branch pipe joint is heated, and the axially central portion of the protruding portion of the branch pipe portion of the saddle portion and the side edge portion of the edge of the saddle portion are pressed from the outer surface side, and the side edge of the portion The branch pipe joint 10 may be manufactured by reducing the distance between the parts. In addition, if the pressing process to the saddle portion is performed while, for example, the branch pipe joint immediately after removing the injection mold is still in a softened state, a separate heat treatment can be omitted. Can be manufactured easily.

また、たとえば、分岐管継手１０を成形するための専用の射出成形用金型、つまりサドル部を成形する部分を湾曲させた専用金型を製作し、その専用金型を用いて、分岐管継手１０を射出成形によって１度に（つまり押圧加工を施すことなく）成形することもできる。ただし、この場合には、金型を無理抜きする必要があるので、金型の取り外し作業には注意を要する。もちろん、これらの他にも適宜の方法を採用できる。 In addition, for example, a dedicated injection mold for molding the branch pipe joint 10, that is, a dedicated mold in which a portion for molding the saddle portion is curved, and the branch pipe joint is manufactured using the dedicated mold. 10 can be molded by injection molding at once (that is, without pressing). However, in this case, it is necessary to forcibly remove the mold, so care must be taken when removing the mold. Of course, other appropriate methods can be adopted.

続いて、図１および図５を参照して、上述のような分岐管継手１０を用いて本管１２と分岐管１４とを接続する方法について説明する。 Next, a method of connecting the main pipe 12 and the branch pipe 14 using the branch pipe joint 10 as described above will be described with reference to FIGS. 1 and 5.

先ず、本管１２の所望位置にケーブル１６を取り出すための分岐孔１８を形成する。分岐孔１８の形状は、分岐管継手１０の環状突起２６の外縁に沿う形状、すなわち管軸方向に延びる略角丸矩形状である。分岐孔１８を形成する際には、先ず、本管１２の外面にけがきゲージをセットして、けがき線を記す。そして、ドリル、カッター、エンドミルおよび鋸などの専用工具を用いて、けがき線に従って本管１２を穿孔し、本管１２に分岐孔１８を形成するとよい。なお、本管１２内に既設のケーブル１６がない場合には、ホールソーを用いて分岐孔１８の両端に当たる位置に２つの孔を形成した後、２つの孔を連結するように分岐孔１８の両側縁に当たる位置をカットすることによって、本管１２に分岐孔１８を形成してもよい。また、分岐孔１８の周縁は、ヤスリ等を用いて適宜面取りする。本管１２に分岐孔１８を形成すると、押出成形時の残留応力によって管内面側に曲がる力が
管壁に作用するので、本管１２の分岐孔１８を形成した部分の外径は、それ以外の部分の外径と比較して小さくなる（図６参照）。 First, a branch hole 18 for taking out the cable 16 is formed at a desired position of the main pipe 12. The shape of the branch hole 18 is a shape along the outer edge of the annular protrusion 26 of the branch pipe joint 10, that is, a substantially rounded rectangular shape extending in the pipe axis direction. When forming the branch hole 18, first, a scribing gauge is set on the outer surface of the main pipe 12, and a scribing line is marked. And it is good to drill the main pipe | tube 12 according to a marking line using special tools, such as a drill, a cutter, an end mill, and a saw, and to form the branch hole 18 in the main pipe | tube 12. If there is no existing cable 16 in the main pipe 12, two holes are formed at positions corresponding to both ends of the branch hole 18 using a hole saw, and then both sides of the branch hole 18 are connected so as to connect the two holes. The branch hole 18 may be formed in the main pipe 12 by cutting the position that hits the edge. Further, the periphery of the branch hole 18 is appropriately chamfered using a file or the like. When the branch hole 18 is formed in the main pipe 12, a force that bends to the inner surface of the pipe due to residual stress at the time of extrusion molding acts on the pipe wall. Therefore, the outer diameter of the portion where the branch hole 18 of the main pipe 12 is formed is otherwise This is smaller than the outer diameter of the portion (see FIG. 6).

次に、本管１２に分岐管継手１０を接着接合によって取り付ける。この際には、本管１２の外面またはサドル部２０の内面、或いはそれら双方の所定部分に対して、接着剤（接合剤）を塗布する。接着剤としては、たとえば、塩化ビニル系の溶剤タイプの接着剤や、エポキシ樹脂系またはアクリル系の充填タイプの接着剤を用いることができるが、後述のように、コスト、施工事故の発生および施工性などを考慮すると、塩化ビニル系の溶剤タイプの接着剤を用いることが好ましい。 Next, the branch pipe joint 10 is attached to the main pipe 12 by adhesive bonding. At this time, an adhesive (bonding agent) is applied to the outer surface of the main pipe 12, the inner surface of the saddle portion 20, or both predetermined portions. As the adhesive, for example, a vinyl chloride type solvent type adhesive or an epoxy resin type or acrylic type adhesive can be used. Considering the properties, it is preferable to use a vinyl chloride solvent type adhesive.

接着剤の塗布後、本管１２の分岐孔１８に分岐管継手１０の環状突起２６を嵌め込み、本管１２の外面とサドル部２０の内面とを密着させた状態で、固定バンドをサドル部２０の外面に装着して固定する。このとき、分岐管継手１０の軸方向および周方向の動きは、本管１２の分岐孔１８に環状突起２６が嵌め込まれることによって確実に拘束される。そして、枝管部突出部分２０ａの軸方向中央近傍におけるサドル部２０内面の側縁部間距離Ｗが、枝管部突出部分２０ａの外側部分（少なくとも固定バンドの取付位置２０ｂ）の側縁部間距離Ｗより小さくされ、また、少なくとも端縁２０ｄの側縁部間距離Ｗが、固定バンドの取付位置２０ｂの側縁部間距離Ｗより小さくされることによって、サドル部２０の内面全体が本管１２外面に対してより高い密着性を有して密着する。 After application of the adhesive, the annular projection 26 of the branch pipe joint 10 is fitted into the branch hole 18 of the main pipe 12 and the outer surface of the main pipe 12 and the inner surface of the saddle part 20 are brought into close contact with each other. Attach to the outer surface of and fix. At this time, the axial and circumferential movements of the branch pipe joint 10 are reliably restrained by fitting the annular protrusions 26 into the branch holes 18 of the main pipe 12. The distance W between the side edges of the inner surface of the saddle portion 20 in the vicinity of the center in the axial direction of the branch pipe projecting part 20a is the distance between the side edges of the outer part of the branch pipe projecting part 20a (at least the fixing band mounting position 20b). By making the distance W smaller than the distance W and at least the distance W between the side edges of the end edge 20d smaller than the distance W between the side edges of the fixing band mounting position 20b, the entire inner surface of the saddle portion 20 is connected to the main pipe. 12 Adhering to the outer surface with higher adhesion.

その後、枝管部２２の先端開口からウエス（布）等を差し入れ、分岐孔１８の周縁と突起部２６の外周面との間からはみ出した接着剤などをウエス等によって適宜拭き取る。この際、環状突起２６の他方側部分２６ｂの内周面が曲面で滑らかに落とし込まれて、開口２４の大きさが確保されているので、ウエス等を引き抜くときにこの部分での引っ掛かりが生じず、清掃作業を容易に行うことができる。 Thereafter, a rag (cloth) or the like is inserted from the distal end opening of the branch pipe portion 22, and the adhesive or the like protruding from between the peripheral edge of the branch hole 18 and the outer peripheral surface of the protruding portion 26 is appropriately wiped off with a rag or the like. At this time, the inner peripheral surface of the other side portion 26b of the annular protrusion 26 is smoothly dropped with a curved surface, and the size of the opening 24 is secured. Therefore, when the waste or the like is pulled out, the portion is caught in this portion. Therefore, the cleaning work can be easily performed.

本管１２への分岐管継手１０の取付作業が終了すると、枝管部２２に分岐管１４を接着接合などによって接続することにより、本管１２と分岐管１４との接続作業を終了する。 When the attachment work of the branch pipe joint 10 to the main pipe 12 is completed, the connection work between the main pipe 12 and the branch pipe 14 is finished by connecting the branch pipe 14 to the branch pipe portion 22 by adhesive bonding or the like.

この実施例によれば、枝管部突出部分２０ａの軸方向中央近傍におけるサドル部２０内面の側縁部間距離Ｗを、枝管部突出部分２０ａの外側部分（少なくとも固定バンドの取付位置２０ｂ）の側縁部間距離Ｗより小さくした。このため、本管１２外面とサドル部１２内面とを接着接合する際に、分岐孔１８の穿孔によって縮径した部分の本管１２外面に対して枝管部突出部分２０ａのサドル部２０内面が沿うので、サドル部２０の内面全体がより適切に本管１２外面に密着するようになる。したがって、接着不良を生じることなく本管１２に対して分岐管継手１０を適切に取り付けることができる。 According to this embodiment, the distance W between the side edges of the inner surface of the saddle portion 20 in the vicinity of the center in the axial direction of the branch pipe projecting portion 20a is set as the outer portion of the branch pipe projecting portion 20a (at least the fixing band mounting position 20b). It was made smaller than the distance W between the side edges. For this reason, when the outer surface of the main pipe 12 and the inner surface of the saddle portion 12 are bonded and bonded, the inner surface of the saddle portion 20 of the protruding portion 20a of the branch pipe portion protrudes from the outer surface of the main pipe 12 whose diameter is reduced by drilling the branch hole 18. Therefore, the entire inner surface of the saddle portion 20 comes into close contact with the outer surface of the main pipe 12 more appropriately. Therefore, the branch pipe joint 10 can be appropriately attached to the main pipe 12 without causing poor adhesion.

なお、本管１２外面とサドル部２０内面とを接着接合する際には、塩化ビニル系の溶剤タイプの接着剤（塩化ビニル系接着剤）や、エポキシ樹脂系またはアクリル系の充填タイプの接着剤（エポキシ系またはアクリル系接着剤）などが用いられるが、エポキシ系またはアクリル系接着剤は、塩化ビニル系接着剤と比較して高価であり、また、たとえばエポキシ系またはアクリル系接着剤を塗布し過ぎて本管１２内部にたれてしまった場合には、ケーブル１８表面や本管１２内部で固化してケーブル１８を損傷してしまう恐れがある。また、２液混合タイプのエポキシ系またはアクリル系接着剤を用いると、作業性も悪くなる。さらに、分岐管継手１０のリサイクルを考えた場合、塩化ビニル系接着剤と違ってエポキシ系またはアクリル系接着剤は不純物となってしまう。したがって、塩化ビニル系接着剤を用いる方が好ましいが、塩化ビニル系接着剤では、接着機能を適切に発揮するためには、サドル部２０の内面と本管１２外面との間により高い密着性が求められる。しかしながら、この実施例によれば、サドル部２０の内面全体が本管１２外面に対して高い密着性を有して適切に密着するので、塩化ビニル系接着剤であっても好適に用いることができ
る。 When the outer surface of the main pipe 12 and the inner surface of the saddle portion 20 are adhesively bonded, a vinyl chloride solvent type adhesive (vinyl chloride adhesive), an epoxy resin type or an acrylic filling type adhesive is used. (Epoxy or acrylic adhesives) are used, but epoxy or acrylic adhesives are more expensive than vinyl chloride adhesives. For example, epoxy or acrylic adhesives are applied. If it passes too much and falls inside the main pipe 12, the cable 18 may be solidified on the surface of the cable 18 or inside the main pipe 12 to damage the cable 18. In addition, when a two-component mixed type epoxy or acrylic adhesive is used, workability also deteriorates. Furthermore, when the recycling of the branch pipe joint 10 is considered, the epoxy or acrylic adhesive becomes an impurity unlike the vinyl chloride adhesive. Therefore, it is preferable to use a vinyl chloride adhesive. However, in order to properly exhibit an adhesive function, the vinyl chloride adhesive has higher adhesion between the inner surface of the saddle portion 20 and the outer surface of the main pipe 12. Desired. However, according to this embodiment, since the entire inner surface of the saddle portion 20 has high adhesion to the outer surface of the main pipe 12 and adheres appropriately, even a vinyl chloride adhesive is preferably used. it can.

また、この実施例では、少なくとも端縁２０ｄにおけるサドル部２０内面の側縁部間距離Ｗを、固定バンドの取付位置２０ｂの側縁部間距離Ｗより小さくした。このため、サドル部２０の端縁近傍の内面が本管１２外面により適切に密着するようになり、本管１２に対して分岐管継手１０をより適切に接着接合できる。 In this embodiment, the distance W between the side edges of the inner surface of the saddle portion 20 at least at the edge 20d is made smaller than the distance W between the side edges of the fixing band mounting position 20b. For this reason, the inner surface in the vicinity of the edge of the saddle portion 20 comes into closer contact with the outer surface of the main pipe 12, and the branch pipe joint 10 can be more appropriately adhesively bonded to the main pipe 12.

さらに、この実施例では、開口２４の周縁に沿って延びる環状突起２６をサドル部２０の内面に形成したので、本管１２の分岐孔１８に環状突起２６を嵌め込むことによって、分岐管継手１０の軸方向および周方向の動きが確実に拘束される。したがって、その取付位置から分岐管継手１０がずれてしまうことがなく、適切に分岐管継手１０を本管１２に取り付けることができる。 Further, in this embodiment, since the annular protrusion 26 extending along the periphery of the opening 24 is formed on the inner surface of the saddle portion 20, the annular protrusion 26 is fitted into the branch hole 18 of the main pipe 12, so The movement in the axial direction and the circumferential direction is reliably restrained. Therefore, the branch pipe joint 10 is not displaced from the attachment position, and the branch pipe joint 10 can be appropriately attached to the main pipe 12.

また、サドル部２０に厚肉部を形成することによって環状突起２６を形成した。すなわち、枝管部２２周囲のサドル部２０外面に凹部を形成しないようにした。このため、本管１２に分岐管継手１０を取り付ける際には、サドル部２０の軸方向両端部の取付位置２０ｂだけでなく、サドル部２０の中央部分の取付位置２０ｃ、つまり本管１２に穿孔される分岐孔１８の一端に対応する枝管部２２近傍の取付位置２０ｃにも、固定バンドを装着することができるようになる（図１および図４参照）。これによって、分岐孔１８の一端に対応する位置において穿孔による本管１２の歪みを矯正して、本管１２に対してサドル部２０をバランス良く押さえ付けることができるので、本管１２の外面とサドル部２０の内面とをより適切に接着接合できる。 Further, the annular protrusion 26 was formed by forming a thick portion on the saddle portion 20. That is, the concave portion is not formed on the outer surface of the saddle portion 20 around the branch pipe portion 22. For this reason, when the branch pipe joint 10 is attached to the main pipe 12, not only the attachment positions 20 b at both ends in the axial direction of the saddle part 20 but also the attachment positions 20 c at the center part of the saddle part 20, that is, the main pipe 12 is perforated. The fixing band can also be attached to the attachment position 20c in the vicinity of the branch pipe portion 22 corresponding to one end of the branched hole 18 (see FIGS. 1 and 4). Thereby, distortion of the main pipe 12 due to the drilling can be corrected at a position corresponding to one end of the branch hole 18, and the saddle portion 20 can be pressed against the main pipe 12 in a well-balanced manner. The inner surface of the saddle portion 20 can be more appropriately adhesively bonded.

さらに、環状突起２６の傾斜面２８の傾斜角度を、枝管部２２の分岐角度以下であって、本管１２の管軸に対して概略２５°以上である角度範囲に設定するので、分岐管継手１０を射出成形によって適切に成形できると共に、本管１２に取り付ける際の分岐管継手１０の軸方向の動きを確実に拘束できる。 Further, the inclination angle of the inclined surface 28 of the annular protrusion 26 is set to an angle range that is equal to or less than the branch angle of the branch pipe portion 22 and approximately 25 ° or more with respect to the tube axis of the main pipe 12. The joint 10 can be appropriately formed by injection molding, and the axial movement of the branch pipe joint 10 when attached to the main pipe 12 can be reliably restrained.

また、環状突起２６の突出高さを本管１２の内面とほぼ同じ高さ、或いは少し突出する高さとした。このため、分岐管２２にケーブル１６を引き込む際には、ケーブル１６やその通線治具は、環状突起２６によって本管１２径方向の位置が制限される。つまり、環状突起２６がケーブル１６等のガイドとして機能し、ケーブル１６等と本管１２の分岐孔１８の周縁との接触を避けることができる。したがって、ケーブル１６の引込作業時のケーブル１６等の引っ掛かりや、ケーブル１６等の損傷を防止できる。 Further, the projecting height of the annular protrusion 26 is set to be substantially the same as the inner surface of the main pipe 12 or slightly projecting. For this reason, when the cable 16 is drawn into the branch pipe 22, the position of the cable 16 and its wiring jig in the radial direction of the main pipe 12 is limited by the annular protrusion 26. That is, the annular protrusion 26 functions as a guide for the cable 16 and the like, and contact between the cable 16 and the peripheral edge of the branch hole 18 of the main pipe 12 can be avoided. Therefore, it is possible to prevent the cable 16 and the like from being caught and the cable 16 and the like from being damaged when the cable 16 is retracted.

また、環状突起２６の外縁形状を軸方向両側が非対称となる形状にしたので、本管１２に対して分岐管継手１０を誤って逆向きに取り付けてしまうことを防止できる。何故なら、本管１２に分岐管継手１０を取り付ける際に、分岐管継手１０の取付方向が逆向きになっていると、本管１２の分岐孔１８に環状突起２６を嵌め込めないからである。 Further, since the outer edge shape of the annular protrusion 26 is asymmetric on both sides in the axial direction, it is possible to prevent the branch pipe joint 10 from being erroneously attached to the main pipe 12 in the reverse direction. This is because when attaching the branch pipe joint 10 to the main pipe 12, if the attachment direction of the branch pipe joint 10 is reversed, the annular protrusion 26 cannot be fitted into the branch hole 18 of the main pipe 12. .

なお、上述の実施例では、サドル部２０外面から押圧する等してサドル部２０の管壁を湾曲させることによって、サドル部２０内面の側縁部間距離Ｗを小さくするようにしたが、これに限定されず、サドル部２０内面側に突出する厚肉部を形成することによって、サドル部２０内面の側縁部間距離Ｗ（または曲率半径）を小さくすることもできる。 In the above-described embodiment, the distance W between the side edges of the inner surface of the saddle portion 20 is reduced by curving the tube wall of the saddle portion 20 by pressing from the outer surface of the saddle portion 20. However, the distance W (or the radius of curvature) between the side edges of the inner surface of the saddle portion 20 can be reduced by forming a thick portion protruding toward the inner surface side of the saddle portion 20.

また、上述の実施例では、本管１２に対して分岐管継手１０を略水平方向（５°の取付角度）に取り付けるようにしたが、これに限定されず、分岐管継手１０の取付角度は適宜変更され得る。 In the above-described embodiment, the branch pipe joint 10 is attached to the main pipe 12 in a substantially horizontal direction (5 ° attachment angle). However, the present invention is not limited to this, and the attachment angle of the branch pipe joint 10 is It can be changed appropriately.

さらに、上述の実施例では、サドル部２０を半円筒状に形成した（つまり開口角を１８
０°とした）が、これに限定されない。サドル部２０は、本管１２の外面に沿うように湾曲する形状であって、本管１２の外面と適切に接着接合できる大きさを有していればよく、たとえば周方向の長さを半円よりも大きくすることもできるし、小さくすることもできる。また、両端部などの本管１２の抱え込みを強めたい部分や、枝管部２２付近などの接着しろを多く取りたい部分など、サドル部２０の開口角を部分的に１８０°より小さくするようにしてもよい。 Further, in the above-described embodiment, the saddle portion 20 is formed in a semi-cylindrical shape (that is, the opening angle is 18).
However, the present invention is not limited to this. The saddle portion 20 may have a shape that curves along the outer surface of the main pipe 12 and has a size that can be appropriately bonded to the outer surface of the main pipe 12. It can be larger or smaller than a circle. Further, the opening angle of the saddle portion 20 is partially made smaller than 180 °, such as a portion where the holding of the main pipe 12 such as both ends is desired, or a portion where a large margin of adhesion is required such as the vicinity of the branch pipe portion 22. May be.

また、分岐管継手１０は、無色透明および有色透明を含む透明の樹脂で形成することもできる。分岐管継手１０を透明にすることによって、本管１２への取付状況が分かり易くなるので、より適切に分岐管継手１０を本管１２に取り付けることができるようになる。 Moreover, the branch pipe joint 10 can also be formed with transparent resin including colorless and transparent. By making the branch pipe joint 10 transparent, the state of attachment to the main pipe 12 can be easily understood, so that the branch pipe joint 10 can be attached to the main pipe 12 more appropriately.

さらに、分岐管継手１０のサドル部２０の内面には、接着剤を塗布する部分を示すためのシボ加工を施すこともできる。たとえば、環状突起２６の外縁から所定間隔をあけたサドル部２０内面の周縁部にシボ加工を施し、このシボ加工の部分に接着剤を塗布するようにするとよい。これにより、接着剤を塗布する部分の把握が作業者にとって容易となるので、より適切に分岐管継手１０を本管１２に取り付けることができるようになる。もちろん、環状突起２６の外縁から所定間隔の部分、つまり接着剤を塗布してはいけない部分にシボ加工を施しておき、このシボ加工を施した部分以外の部分に接着剤を塗布するようにしてもよいし、接着剤を塗布する部分と塗布しない部分との境界線としてシボ加工を施してもよい。 Further, the inner surface of the saddle portion 20 of the branch pipe joint 10 can be subjected to a texture process for indicating a portion to which an adhesive is applied. For example, it is preferable to apply a texture to the peripheral edge of the inner surface of the saddle portion 20 spaced a predetermined distance from the outer edge of the annular protrusion 26 and apply an adhesive to the textured portion. This makes it easy for the operator to grasp the portion to which the adhesive is applied, so that the branch pipe joint 10 can be attached to the main pipe 12 more appropriately. Of course, a portion of the annular projection 26 that is spaced from the outer edge, that is, a portion that should not be coated with an adhesive, is subjected to graining, and an adhesive is applied to a portion other than the portion subjected to the graining. Alternatively, the embossing may be performed as a boundary line between a portion where the adhesive is applied and a portion where the adhesive is not applied.

また、分岐管１４への枝管部２２の差し込み長さを示すために、枝管部２２の外面に対して、周方向に延びる標線、突起および溝などのような目印を形成することもできる。これにより、分岐管１４への枝管部２２の差し込み長さの把握が作業者にとって容易となるので、差し込み不足などが生じることなく、より適切に分岐管継手１０に分岐管１４を接続できるようになる。 In addition, in order to indicate the length of insertion of the branch pipe portion 22 into the branch pipe 14, marks such as marks, protrusions, and grooves extending in the circumferential direction may be formed on the outer surface of the branch pipe portion 22. it can. This makes it easy for the operator to grasp the length of insertion of the branch pipe portion 22 into the branch pipe 14, so that the branch pipe 14 can be more appropriately connected to the branch pipe joint 10 without causing insufficient insertion. become.

また、環状突起２６の軸方向両側の外縁の径を、市販のホールソーの径と同じ大きさに形成するようにすれば、環状突起２６の外縁に沿う周縁を有する分岐孔１８を、市販のホールソーを用いて容易に本管１２に形成できるようになる。また、環状突起２６は、必ずしも軸方向両側が非対称となる形状に形成する必要はなく、軸方向両側が対称となる形状に形成することもできる。 In addition, if the diameter of the outer edge on both sides in the axial direction of the annular protrusion 26 is formed to be the same as the diameter of the commercially available hole saw, the branch hole 18 having a peripheral edge along the outer edge of the annular protrusion 26 is formed as a commercially available hole saw. It becomes possible to easily form the main pipe 12 using Further, the annular protrusion 26 does not necessarily have to be formed in a shape in which both sides in the axial direction are asymmetric, and can be formed in a shape in which both sides in the axial direction are symmetric.

また、環状突起２６は、必ずしも厚肉部を形成することによって形成する必要はなく、サドル部２０を内面側に屈曲（陥没）させることによって形成することもできる。また、環状突起２６全体を厚肉部とせず、取付位置２０ｃに装着する固定バンドの締め付け機能を損なわない範囲において、サドル部２０の外面側に肉抜きを施すこともできる。さらに、環状突起２６は、必ずしも開口２４全周に亘って延びるように形成する必要はなく、その機能（位置ずれ防止機能）を損なわない範囲で、開口２４周縁に沿って断続的に形成することもできる。つまり、断続的環状突起とすることもできる。また、分岐管継手１０には、環状突起２６を形成しないこともできるし、軸方向一方側を開放したＵ字状突起を形成することできる。 The annular protrusion 26 does not necessarily have to be formed by forming a thick portion, but can also be formed by bending (sinking) the saddle portion 20 toward the inner surface side. In addition, the outer surface side of the saddle portion 20 can be thinned within a range in which the annular protrusion 26 is not entirely thick and does not impair the tightening function of the fixing band attached to the attachment position 20c. Further, the annular protrusion 26 is not necessarily formed so as to extend over the entire circumference of the opening 24, and is formed intermittently along the periphery of the opening 24 within a range not impairing the function (position shift prevention function). You can also. That is, it can also be an intermittent annular protrusion. Further, the branch pipe joint 10 may not be formed with the annular protrusion 26 or may be formed with a U-shaped protrusion that is open on one side in the axial direction.

また、分岐管継手１０を射出成形する場合には、射出成形用金型のキャビティ内に合成樹脂を導入するゲートは、サドル部２０の周方向中央部（天頂部）であって、枝管部２２の突出方向とは逆側の軸方向部分（図４(ｂ)において右側の外側部分）に設けるようにすることが好ましい。これによって、射出した樹脂の流れが最適となると共に、射出成形する際にサドル部２０外面に形成されるゲート部を、分岐管継手１０の勾配などを測定するため等に利用することもできるようになる。 Further, when the branch pipe joint 10 is injection-molded, the gate for introducing the synthetic resin into the cavity of the injection mold is the center part (zenith part) in the circumferential direction of the saddle part 20, and the branch pipe part It is preferable to provide it in the axial direction part (the outer part on the right side in FIG. 4B) opposite to the protruding direction of 22. As a result, the flow of the injected resin is optimized, and the gate portion formed on the outer surface of the saddle portion 20 at the time of injection molding can be used for measuring the gradient of the branch pipe joint 10 and the like. become.

なお、上述した寸法などの具体的数値は、いずれも単なる一例であり、必要に応じて適宜変更可能なものである。 Note that the specific numerical values such as the dimensions described above are merely examples, and can be appropriately changed as necessary.

１０ …分岐管継手
１２ …本管
１４ …分岐管
１６ …ケーブル
１８ …本管の分岐孔
２０ …サドル部
２０ａ …サドル部の枝管部突出部分
２０ｂ …サドル部両端部の固定バンド取付位置
２０ｃ …サドル部の軸方向端縁
２２ …枝管部
２４ …サドル部の開口
２６ …環状突起 DESCRIPTION OF SYMBOLS 10 ... Branch pipe joint 12 ... Main pipe 14 ... Branch pipe 16 ... Cable 18 ... Main pipe branch hole 20 ... Saddle part 20a ... Branch pipe part protrusion part of a saddle part 20b ... Fixed band attachment position 20c ... of a saddle part both ends Edge in the axial direction of the saddle part 22 ... Branch pipe part 24 ... Opening of the saddle part 26 ... Annular projection

Claims

A branch pipe joint that connects a main pipe of a cable protection pipe that accommodates and protects a cable and a branch pipe,
A saddle portion attached in close contact with the outer surface of the main pipe,
A branch pipe part that protrudes from the outer surface of the saddle part and has a branching angle that is an acute angle with respect to the pipe axis of the main pipe when the saddle part is attached to the main pipe;
An opening formed in a connecting portion of the saddle portion with the branch pipe portion, communicating with the inside of the branch pipe portion, and an annular protrusion protruding from the inner surface of the saddle portion and annularly formed along a peripheral edge of the opening With
The gate trace portion in which the synthetic resin is introduced into the cavity of the injection mold when the branch pipe joint is injection-molded is a central portion in the circumferential direction, and the axial direction opposite to the branch direction of the branch pipe portion Formed in the part ,
The annular protrusion is formed by providing a thick portion with a large thickness in the saddle portion without causing the saddle portion to be depressed on the inner surface side,
The outer surface of the saddle portion in the portion where the annular protrusion is formed is formed to form a cylindrical surface,
The outer peripheral surface of the annular projection on the branch pipe portion branching direction side is formed by an inclined surface, and the inclination angle of the inclined surface with respect to the tube axis of the main pipe is set to be equal to or less than the branch angle of the branch pipe portion,
The four corners of the outer surface of the saddle part are formed at a position of 85 ° from the central axis of the branch pipe part with the pipe axis of the main pipe as the center. A branch pipe joint having a mark that is directed upward by 5 ° from the horizontal direction.

A branch pipe joint that connects a main pipe of a cable protection pipe that accommodates and protects a cable and a branch pipe,
A saddle portion attached in close contact with the outer surface of the main pipe,
A branch pipe part that protrudes from the outer surface of the saddle part and has a branching angle that is an acute angle with respect to the pipe axis of the main pipe when the saddle part is attached to the main pipe;
An opening formed in a connecting portion of the saddle portion with the branch pipe portion, communicating with the inside of the branch pipe portion, and an annular protrusion protruding from the inner surface of the saddle portion and annularly formed along a peripheral edge of the opening With
The gate trace portion in which the synthetic resin is introduced into the cavity of the injection mold when the branch pipe joint is injection-molded is a central portion in the circumferential direction, and the axial direction opposite to the branch direction of the branch pipe portion Formed in the part ,
The annular protrusion is formed by providing a thick part having a large thickness in the saddle part without causing the saddle part to be depressed on the inner surface side, and intermittently formed along the periphery of the opening. An annular projection,
The outer surface of the saddle portion in the portion where the annular protrusion is formed is formed to form a cylindrical surface,
The outer peripheral surface of the annular projection on the branch pipe portion branching direction side is formed by an inclined surface, and the inclination angle of the inclined surface with respect to the tube axis of the main pipe is set to be equal to or less than the branch angle of the branch pipe portion,
The four corners of the outer surface of the saddle part are formed at a position of 85 ° from the central axis of the branch pipe part with the pipe axis of the main pipe as the center. A branch pipe joint having a mark that is directed upward by 5 ° from the horizontal direction.

  A branch pipe joint that connects a main pipe of a cable protection pipe that accommodates and protects a cable and a branch pipe,
  A saddle portion attached in close contact with the outer surface of the main pipe,
  A branch pipe part that protrudes from the outer surface of the saddle part and has a branching angle that is an acute angle with respect to the pipe axis of the main pipe when the saddle part is attached to the main pipe;
  An opening formed in a connecting portion of the saddle portion with the branch pipe portion and communicating with the inside of the branch pipe portion; and
  Projecting from the inner surface of the saddle portion, and having a projection formed on the periphery of the opening;
  An outer peripheral surface of the projection on the branch pipe portion branching direction side is formed by an inclined surface, and an inclination angle of the inclined surface with respect to a pipe axis of the main pipe is set to be equal to or less than a branch angle of the branch pipe portion,
  The gate trace portion in which the synthetic resin is introduced into the cavity of the injection mold when the branch pipe joint is injection-molded is a central portion in the circumferential direction, and the axial direction opposite to the branch direction of the branch pipe portion Branch pipe joint formed in the part.

  A branch pipe joint that connects a main pipe of a cable protection pipe that accommodates and protects a cable and a branch pipe,
  A saddle portion attached in close contact with the outer surface of the main pipe,
  A branch pipe part that protrudes from the outer surface of the saddle part and has a branching angle that is an acute angle with respect to the pipe axis of the main pipe when the saddle part is attached to the main pipe;
  An opening formed in a connecting portion of the saddle portion with the branch pipe portion and communicating with the inside of the branch pipe portion; and
  Projecting from the inner surface of the saddle portion, and having a projection formed on the periphery of the opening;
  An outer peripheral surface of the projection on the branch pipe portion branching direction side is formed by an inclined surface, and an inclination angle of the inclined surface with respect to a pipe axis of the main pipe is set to be equal to or less than a branch angle of the branch pipe portion,
  The outer surface of the saddle portion is formed at a position of 85 ° from the central axis of the branch pipe portion with the tube axis of the main pipe as a center. A branch fitting with a mark that turns upward by 5 °.