JP2007187204A - Branch pipe for hydrant - Google Patents

Branch pipe for hydrant Download PDF

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Publication number
JP2007187204A
JP2007187204A JP2006004275A JP2006004275A JP2007187204A JP 2007187204 A JP2007187204 A JP 2007187204A JP 2006004275 A JP2006004275 A JP 2006004275A JP 2006004275 A JP2006004275 A JP 2006004275A JP 2007187204 A JP2007187204 A JP 2007187204A
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branch pipe
pipe
diameter
fire hydrant
hydrant
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JP2006004275A
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JP4794304B2 (en
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Katsutoshi Tenma
勝利 天満
Koji Kususe
幸司 楠瀬
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Kubota Corp
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Kubota Corp
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  • Flanged Joints, Insulating Joints, And Other Joints (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branch pipe for a hydrant, which can prevent an unreasonable force from being applied on the branch pipe even at the occurrence of earthquake etc., and facilitates an insertion of each kind of equipment into a main pipe through the branch pipe. <P>SOLUTION: The branch pipe for hydrant is comprised of an upward branch pipe 11 branched from the laterally facing main pipe 1, and the hydrant connected to the branch pipe 11 via joints 12, 13 and 17. The bore diameter of the branch pipe 11 is formed larger than the diameter of a water intake 16 of the hydrant. The wall thickness of the branch pipe 11 is formed larger than the wall thickness of the pipe corresponding to the bore diameter of the water intake 16 of the hydrant. The branch pipe 11 and the water intake 16 of the hydrant are joined with each other by reducing joints 12, 13 and 17. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は消火栓用分岐管に関する。   The present invention relates to a branch pipe for a fire hydrant.

水道管には、消火栓が設置されることがある。この消火栓の設置部においては、地中において横向きに設置された本管から上向きの枝管が分岐され、この枝管に継手を介して消火栓が接合される構成が一般的である（特許文献１）。このような枝管を備えた消火栓用分岐管が、水道管路の一部を構成する。   Fire hydrants may be installed in water pipes. In this fire hydrant installation part, an upward branch pipe is branched from a main pipe installed sideways in the ground, and a fire hydrant is joined to this branch pipe through a joint (Patent Document 1). ). A branch pipe for a fire hydrant provided with such a branch pipe constitutes a part of a water pipe.

以下、図２を参照して、従来の消火栓用分岐管について説明する。ここで１はダクタイル鋳鉄製の本管であり、横向きに配管されるように構成され、その一端に受口２を有するとともに他端に挿口３を有し、これら受口２および挿口３によって他の管と接合される。本管１から上向きの枝管４が分岐されており、この枝管４は、本管１と一体に鋳造された構成である。枝管４の上端にはフランジ継手５が形成されている。   Hereinafter, a conventional branch pipe for a fire hydrant will be described with reference to FIG. Here, 1 is a main duct made of ductile cast iron, which is configured to be piped horizontally, and has a receiving port 2 at one end and an insertion port 3 at the other end, and these receiving port 2 and insertion port 3. To be joined with other pipes. An upward branch pipe 4 is branched from the main pipe 1, and the branch pipe 4 has a structure in which the main pipe 1 is cast integrally. A flange joint 5 is formed at the upper end of the branch pipe 4.

このフランジ継手５を介して、図示を省略した消火栓の下端の吸水部が接合されるように構成されている。規格により、消火栓の吸水部の口径はたとえば７５ｍｍとされており、フランジ継手５もその口径のものが形成され、枝管４もそれに応じた口径および肉厚で形成されている。これに対し、本管１は、通常は枝管４よりも口径が大きく、その口径がたとえば１００ｍｍ以上かつ数百ｍｍ以下であり、またその口径に応じた肉厚すなわち枝管４よりも大きな肉厚で形成されている。
特開平４−２６６６９２号公報 Via this flange joint 5, the water absorption part of the lower end of the fire hydrant which abbreviate | omitted illustration is joined. According to the standard, the diameter of the water absorption part of the fire hydrant is, for example, 75 mm, the flange joint 5 is also formed with the diameter, and the branch pipe 4 is also formed with the diameter and thickness corresponding to it. On the other hand, the main pipe 1 is usually larger in diameter than the branch pipe 4 and has a diameter of, for example, 100 mm or more and several hundred mm or less, and a wall thickness corresponding to the diameter, that is, a wall larger than the branch pipe 4. It is formed with a thickness.
Japanese Patent Laid-Open No. 4-266692

消火栓は相応の大きな質量を有するものであるが、このような大きな質量を有する消火栓が、その吸水部の規格に対応した７５ｍｍ程度の細い上向きの枝管４の上に乗せられた構成となっている。   The fire hydrant has a correspondingly large mass, but the fire hydrant having such a large mass is placed on a thin upward branch pipe 4 of about 75 mm corresponding to the specification of the water absorption part. Yes.

このため、地震の発生時になどにおいて枝管４に無理な力が掛かりやすいという課題がある。また本管１を含む水道管路の内部のメンテナンスを行う際には、枝管４から消火栓を取り外したうえで、本管１の内部に管内カメラなどを挿入して検査することが行われているが、上記のように枝管４の口径が小さく細いため、その挿入作業が容易でないという課題もある。   Therefore, there is a problem that an excessive force is easily applied to the branch pipe 4 when an earthquake occurs. In addition, when performing maintenance inside the water pipe including the main pipe 1, a fire hydrant is removed from the branch pipe 4, and an in-pipe camera or the like is inserted into the main pipe 1 for inspection. However, since the diameter of the branch pipe 4 is small and thin as described above, there is a problem that the inserting operation is not easy.

そこで本発明は、このような課題を解決して、地震の発生時などにおいて枝管に無理な力がかかることを防止できるようにするとともに、枝管を通しての本管内への各種機器の挿入を容易に行えるようにすることを目的とする。   Therefore, the present invention solves such problems and prevents an excessive force from being applied to the branch pipe in the event of an earthquake, etc., and allows various devices to be inserted into the main pipe through the branch pipe. The purpose is to make it easy.

上記の目的を達成するため本発明は、横向きの本管から上向きの枝管が分岐され、この枝管に継手を介して消火栓を接合するようにした消火栓用分岐管において、前記枝管の口径を前記消火栓の吸水部の口径よりも大きく形成するとともに、前記枝管の肉厚を前記消火栓の吸水部の口径に対応した管の肉厚よりも厚く形成し、かつ前記枝管と消火栓の吸水部とを径違い継手によって互いに接合したものである。   In order to achieve the above object, the present invention is directed to a fire hydrant branch pipe in which an upward branch pipe is branched from a lateral main pipe and a fire hydrant is joined to the branch pipe via a joint. Is formed larger than the diameter of the water absorption part of the fire hydrant, and the thickness of the branch pipe is made thicker than the thickness of the pipe corresponding to the diameter of the water absorption part of the fire hydrant, and the water absorption of the branch pipe and the fire hydrant The parts are joined to each other by a reduced diameter joint.

したがって本発明によれば、枝管の口径を消火栓の吸水部の口径よりも大きく形成するとともに、枝管の肉厚を消火栓の吸水部の口径に対応した管の肉厚よりも厚く形成したため、枝管を、規格通りの消火栓に接合可能でありながら強度の高いものとすることができ、したがって地震の発生時などにおいて枝管に無理な力が掛かることを防止できる。また、このように枝管の口径を消火栓の吸水部の口径よりも大きく形成したにもかかわらず、枝管と消火栓の吸水部とを径違い継手によって互いに接合したため、両者の接合を支障なく行うことができる。しかも、枝管の口径を大きくしたことで、この枝管から消火栓を取り外したうえでの本管内への管内検査機器などの挿入を容易に行うことができる。   Therefore, according to the present invention, the diameter of the branch pipe is formed larger than the diameter of the water absorption part of the fire hydrant, and the thickness of the branch pipe is formed thicker than the thickness of the pipe corresponding to the diameter of the water absorption part of the fire hydrant, The branch pipe can be made to have high strength while being able to be joined to a fire hydrant according to the standard. Therefore, it is possible to prevent an excessive force from being applied to the branch pipe when an earthquake occurs. In addition, since the diameter of the branch pipe is formed larger than the diameter of the water absorption part of the fire hydrant, the branch pipe and the water absorption part of the fire hydrant are joined to each other by the joint of different diameters, so that the both can be joined without any trouble. be able to. Moreover, since the diameter of the branch pipe is increased, it is possible to easily insert an in-pipe inspection device or the like into the main pipe after removing the fire hydrant from the branch pipe.

図１は、本発明の実施の形態の消火栓用分岐管を示す。ここで、１はダクタイル鋳鉄製の本管であり、一端に受口２を有するとともに他端に挿口３を有した構成であって、たとえば地中に設置されて横方向に配置されるものである。本管１から上向きに枝管１１が分岐されており、この枝管１１は、本管１と一体に鋳造されている。枝管１１の上端にはフランジ１２が形成されており、このフランジ１２を利用して蓋１３が取り付けられている。１４は、取付け用のボルト・ナットなどの締結具である。蓋１３の中央には開口１５が形成されている。また、蓋１３を利用して、消火栓における管状の吸水部１６のフランジ１７が取り付けられている。１８は、取付け用のボルト・ナットなどの締結具である。消火栓の吸水部１６は、蓋１３の開口１５によって枝管１１に連通している。   FIG. 1 shows a branch pipe for a fire hydrant according to an embodiment of the present invention. Here, 1 is a ductile cast iron main pipe having a receiving port 2 at one end and an insertion port 3 at the other end, for example, installed in the ground and arranged in the lateral direction. It is. A branch pipe 11 is branched upward from the main pipe 1, and the branch pipe 11 is cast integrally with the main pipe 1. A flange 12 is formed at the upper end of the branch pipe 11, and a lid 13 is attached using this flange 12. Reference numeral 14 denotes a fastener such as a bolt or nut for mounting. An opening 15 is formed in the center of the lid 13. Moreover, the flange 17 of the tubular water absorption part 16 in a fire hydrant is attached using the lid 13. Reference numeral 18 denotes a fastener such as a bolt or nut for mounting. The water absorption part 16 of the fire hydrant communicates with the branch pipe 11 through the opening 15 of the lid 13.

消火栓の吸水部１６は、規格により、たとえば口径７５ｍｍに形成されており、その管厚もそれに対応して薄く形成されている。フランジ１７も、吸水部１６の口径に対応した小さなものである。   The water absorption part 16 of the fire hydrant is formed to have a diameter of, for example, 75 mm according to the standard, and the pipe thickness is also formed to be thin accordingly. The flange 17 is also a small one corresponding to the diameter of the water absorption part 16.

これに対し、枝管１１は、吸水部１６よりも大きな口径で、具体的には、上記の吸水部１６の７５ｍｍよりも大きな、たとえば１５０ｍｍの口径で形成されている。本管１は、上述のように、たとえば１００ｍｍ以上かつ数百ｍｍ以下の口径である。そして枝管１１の肉厚は、その口径に対応した肉厚、あるいは枝管１１よりも口径の大きな本管１と同程度の肉厚となるようにされている。   On the other hand, the branch pipe 11 is formed with a larger diameter than the water absorption part 16, specifically, a diameter larger than 75 mm of the water absorption part 16, for example, 150 mm. As described above, the main pipe 1 has a diameter of, for example, 100 mm or more and several hundred mm or less. The thickness of the branch pipe 11 is set to a thickness corresponding to the diameter of the branch pipe 11 or the same thickness as that of the main pipe 1 having a larger diameter than the branch pipe 11.

このような構成であると、枝管１１は、その口径および肉厚が消火栓の吸水部１６の口径および肉厚よりも大きいため、その断面係数が大きく、したがって強度の高いものとなる。また地震などの際に大きな力が作用した場合において、万一損傷が起こるとしても、消火栓あるいは蓋１３の方が破損しやすく、これらの方が先に破損するため、枝管１１および本管１の損傷を避けることができる。   With such a configuration, the branch pipe 11 has a larger diameter and thickness because the diameter and thickness of the branch pipe 11 are larger than the diameter and thickness of the water absorption part 16 of the fire hydrant. Further, when a large force is applied in the event of an earthquake or the like, even if damage occurs, the fire hydrant or the lid 13 is more likely to be damaged, and these are more likely to be damaged first. Can avoid damage.

また、枝管１１の口径を消火栓の吸水部１６の口径よりも大きく形成したにもかかわらず、枝管１１と消火栓の吸水部１６とを、径違い継手として構成される蓋１３によって互いに接合したため、両者の接合を支障なく行うことができる。   Further, because the diameter of the branch pipe 11 is larger than the diameter of the water absorption part 16 of the fire hydrant, the branch pipe 11 and the water absorption part 16 of the fire hydrant are joined to each other by the lid 13 configured as a different diameter joint. Both can be joined without hindrance.

枝管１１の口径を大きくしたことで、この枝管１１から消火栓を取り外したうえでの本管１内への管内検査機器などの挿入を容易に行うことができる。   By increasing the diameter of the branch pipe 11, it is possible to easily insert an in-pipe inspection device or the like into the main pipe 1 after removing the fire hydrant from the branch pipe 11.

本発明の実施の形態の消火栓用分岐管の断面図である。It is sectional drawing of the branch pipe for fire hydrants of embodiment of this invention. 従来の消火栓用分岐管の断面図である。It is sectional drawing of the conventional branch pipe for fire hydrants.

符号の説明Explanation of symbols

１ 本管
１１ 枝管
１３ 蓋
１６ 吸水部 1 Main pipe 11 Branch pipe 13 Lid 16 Water absorption part

Claims (1)

横向きの本管から上向きの枝管が分岐され、この枝管に継手を介して消火栓を接合するようにした消火栓用分岐管であって、前記枝管の口径を前記消火栓の吸水部の口径よりも大きく形成するとともに、前記枝管の肉厚を前記消火栓の吸水部の口径に対応した管の肉厚よりも厚く形成し、かつ前記枝管と消火栓の吸水部とを径違い継手によって互いに接合したことを特徴とする消火栓用分岐管。   A branch pipe for a fire hydrant in which an upward branch pipe is branched from a horizontal main pipe and a fire hydrant is joined to the branch pipe through a joint, and the diameter of the branch pipe is larger than the diameter of the water absorption part of the fire hydrant The branch pipe is made thicker than the pipe corresponding to the diameter of the water absorption part of the fire hydrant, and the branch pipe and the water absorption part of the fire hydrant are joined to each other by a different diameter joint. A branch pipe for a fire hydrant characterized by the above.
JP2006004275A 2006-01-12 2006-01-12 Fire hydrant branch pipe Active JP4794304B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012087846A (en) * 2010-10-18 2012-05-10 Waterworks Technology Development Organization Co Ltd Separation preventive device of pipe joint and pressing ring used therefor
CN111578021A (en) * 2020-05-29 2020-08-25 安徽华星消防设备(集团)有限公司 Three-way type indoor fire hydrant structure
JP2023043991A (en) * 2021-09-17 2023-03-30 株式会社水研 Removal method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS496720U (en) * 1972-04-20 1974-01-21
JPS5967688U (en) * 1982-10-27 1984-05-08 信越化成株式会社 pipe fittings
JPH06158686A (en) * 1992-11-27 1994-06-07 Kubota Corp Pipe for discharging in-pipe foreign matter
JPH09264477A (en) * 1996-03-29 1997-10-07 Kubota Corp Pipe joint for polyethylene aqueduct pipe
JP2004347014A (en) * 2003-05-21 2004-12-09 Sekisui Chem Co Ltd Pipe joint

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS496720U (en) * 1972-04-20 1974-01-21
JPS5967688U (en) * 1982-10-27 1984-05-08 信越化成株式会社 pipe fittings
JPH06158686A (en) * 1992-11-27 1994-06-07 Kubota Corp Pipe for discharging in-pipe foreign matter
JPH09264477A (en) * 1996-03-29 1997-10-07 Kubota Corp Pipe joint for polyethylene aqueduct pipe
JP2004347014A (en) * 2003-05-21 2004-12-09 Sekisui Chem Co Ltd Pipe joint

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012087846A (en) * 2010-10-18 2012-05-10 Waterworks Technology Development Organization Co Ltd Separation preventive device of pipe joint and pressing ring used therefor
CN111578021A (en) * 2020-05-29 2020-08-25 安徽华星消防设备(集团)有限公司 Three-way type indoor fire hydrant structure
JP2023043991A (en) * 2021-09-17 2023-03-30 株式会社水研 Removal method
JP7296434B2 (en) 2021-09-17 2023-06-22 株式会社水研 Removal method

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