JP7350943B2 - Joint structure and valve with dustproof cover and flexible soft seal gate valve - Google Patents

Joint structure and valve with dustproof cover and flexible soft seal gate valve Download PDF

Info

Publication number
JP7350943B2
JP7350943B2 JP2022106018A JP2022106018A JP7350943B2 JP 7350943 B2 JP7350943 B2 JP 7350943B2 JP 2022106018 A JP2022106018 A JP 2022106018A JP 2022106018 A JP2022106018 A JP 2022106018A JP 7350943 B2 JP7350943 B2 JP 7350943B2
Authority
JP
Japan
Prior art keywords
flexible
joint
resin pipe
dustproof cover
press
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2022106018A
Other languages
Japanese (ja)
Other versions
JP2022128498A (en
Inventor
直樹 門居
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimizu Alloy Mfg Co Ltd
Original Assignee
Shimizu Alloy Mfg Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shimizu Alloy Mfg Co Ltd filed Critical Shimizu Alloy Mfg Co Ltd
Publication of JP2022128498A publication Critical patent/JP2022128498A/en
Application granted granted Critical
Publication of JP7350943B2 publication Critical patent/JP7350943B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Joints Allowing Movement (AREA)
  • Valve Housings (AREA)
  • Sliding Valves (AREA)

Description

本発明は、樹脂管の継手部に可撓性を与える樹脂管可撓ユニットとこの樹脂管可撓ユニットを用いた防塵カバーを有する継手構造とバルブ、並びにこの継手構造により可撓する可撓式ソフトシール仕切弁に関する。 The present invention relates to a resin pipe flexible unit that provides flexibility to the joint of a resin pipe, a joint structure and a valve that have a dustproof cover using this resin pipe flexible unit, and a flexible type that is flexible using this joint structure. Regarding soft seal gate valves.

近年、水道用配水管として樹脂管(例えば、ポリエチレン管)が多用されるようになっている。ポリエチレン樹脂は化学的に安定した材料であり、酸・アルカリに強いため、ポリエチレン樹脂で形成したポリエチレン管には腐食が発生せず、長期にわたり衛生的な水を供給することができる。 In recent years, resin pipes (for example, polyethylene pipes) have come to be frequently used as water distribution pipes. Polyethylene resin is a chemically stable material and is resistant to acids and alkalis, so polyethylene pipes made of polyethylene resin do not corrode and can supply sanitary water for a long period of time.

これに加え、ポリエチレン管は、同じく樹脂管である塩化ビニル管に比べ、管自体の柔軟性・可撓性により所謂生曲げが可能であるため、緩やかな曲りは管を生曲げすることにより配管可能であり、曲管の使用を減らして材料費と施工の手間を削減することができるだけでなく、EF(エレクトロフュージョン)接合で形成される一体構造管路により、地震によって生じる地盤の変動に柔軟に追従して変位する優れた耐震性を有している。 In addition, compared to vinyl chloride pipes, which are also resin pipes, polyethylene pipes can be bent so-called due to the flexibility of the pipe itself, so gentle bends can be made by bending the pipes. Not only can this reduce the use of curved pipes, reducing material costs and construction labor, but the monolithic pipe formed by EF (electrofusion) joints is more flexible to ground movements caused by earthquakes. It has excellent earthquake resistance that allows it to move according to the earthquake.

また、近年、水道用配水管に設ける仕切弁は、従来のメタルシート仕切弁に代え、弁体の表面をゴムライニングで被覆し、内外面にエポキシ樹脂粉体塗装を施すことにより錆水(赤水)の発生を防止したソフトシール仕切弁が使用されるようになってきている。 In addition, in recent years, gate valves installed in water pipes have been replaced with conventional metal sheet gate valves by coating the surface of the valve body with a rubber lining and applying epoxy resin powder coating to the inside and outside surfaces. ) soft-seal gate valves that prevent the occurrence of

メタルシート仕切弁は、弁箱弁座と、弁体弁座のクサビ効果を生じさせるため、弁箱弁座の底部にポケットが設けられているので、このポケットにより弁内の流れに乱れが生じて圧力損失が発生するだけでなく、ポケット部分に異物が堆積するおそれがある。これに対し、いわゆるソフトシール仕切弁は、弁体表面に被覆したゴムライニングを圧縮して止水するため、弁箱底部がフラットなストレート構造であり、弁内の流れが乱れないために圧力損失がなく、また、異物が底部に堆積することはないためゴミの噛み込みも発生しない。 Metal seat gate valves have a pocket at the bottom of the valve body valve seat to create a wedge effect between the valve body valve seat and the valve body valve seat.This pocket causes turbulence in the flow inside the valve. Not only will this cause pressure loss, but there is also the risk of foreign matter accumulating in the pockets. On the other hand, so-called soft-seal gate valves compress the rubber lining on the surface of the valve body to shut off water, so they have a straight structure with a flat bottom of the valve body, and the flow inside the valve is not disturbed, resulting in pressure loss. Also, since foreign matter does not accumulate on the bottom, there is no chance of dirt getting caught.

このような特徴を備えたソフトシール仕切弁とポリエチレン管を接続する方法として、例えば、特許文献1のバルブ・管継手接続用締付リングを使用した接続構造がある。この接続構造によれば、ソフトシール仕切弁内の流路やポリエチレン管の内周面に水道水の流れを乱す突起を生じることなくソフトシール仕切弁にポリエチレン管を堅固に取り付けることができる。特許文献1の接続構造等によりソフトシール仕切弁の両側接続部にポリエチレン管を接続し、ポリエチレン挿し口を備えるソフトシール仕切弁は、この挿し口に直接ポリエチレン管をEF接合により融着接続できる利点があり、水道配水管のポリエチレン管路に多用されるようになっている。 As a method for connecting a soft seal gate valve having such characteristics and a polyethylene pipe, there is, for example, a connection structure using a tightening ring for connecting a valve/pipe joint as disclosed in Patent Document 1. According to this connection structure, the polyethylene pipe can be firmly attached to the soft seal gate valve without creating protrusions that disturb the flow of tap water on the flow path in the soft seal gate valve or on the inner peripheral surface of the polyethylene pipe. Polyethylene pipes are connected to both side connection parts of the soft seal gate valve using the connection structure of Patent Document 1, etc., and the soft seal gate valve equipped with a polyethylene insertion port has the advantage that the polyethylene pipe can be directly fusion-connected to this insertion port by EF bonding. It is now widely used in polyethylene pipes for water distribution pipes.

ところで、ポリエチレン管が地震によって生じる地盤の変動に柔軟に追従して変位する優れた耐震性を有するとしても、当然ながらその許容曲げ範囲には限界があり、地盤の変動がある程度大きくなるとソフトシール仕切弁とポリエチレン管の継手部に大きな負荷がかかり、継手部が破損する被害が発生するおそれがある。現代生活において水道は非常に重要なインフラであり、人間の生活にとっては必要不可欠の生命線である。大地震が発生した際に、ソフトシール仕切弁とポリエチレン管との継手部で破損が生じた場合には、仕切弁側の破損個所を部分的に修理することは困難であるため、仕切弁全体の交換が必要となり、復旧に時間がかかることになる。このため、地震発生時の地盤の変動が原因となる継手部への負荷を吸収し、ソフトシール仕切弁とポリエチレン管の継手部での破損を防ぐため、仕切弁とポリエチレン管との継手部に可撓性を与え、継手部の破損を防止することが重要である。 By the way, even though polyethylene pipes have excellent earthquake resistance that allows them to flexibly follow ground movements caused by earthquakes, there is a limit to their permissible bending range, and if the ground movements become large enough, soft seal partitions may be used. A large load is applied to the joint between the valve and the polyethylene pipe, and there is a risk that the joint may be damaged. Water supply is an extremely important infrastructure in modern life, and an essential lifeline for human life. In the event of a major earthquake, if damage occurs at the joint between the soft seal gate valve and the polyethylene pipe, it is difficult to partially repair the damaged part on the gate valve side, so the entire gate valve is damaged. will need to be replaced, and recovery will take time. Therefore, in order to absorb the load on the joint caused by ground movement during an earthquake and prevent damage at the joint between the soft seal gate valve and the polyethylene pipe, the joint between the gate valve and the polyethylene pipe is It is important to provide flexibility and prevent damage to the joint.

また、水道工事においてソフトシール仕切弁のポリエチレン挿し口とポリエチレン管の接続は、前述のように現場でEF接合により行われるが、ポリエチレン管同士の融着作業では双方の軸心が一致している必要があり、軸心が一致しない状態や、軸心が一致しても変位荷重がかかった状態で行うと、施工不良(融着不良)の原因となる。 In addition, in waterworks, the connection between the polyethylene insertion port of a soft seal gate valve and polyethylene pipe is performed on-site using EF bonding, as described above, but when the polyethylene pipes are fused together, the axes of both sides are aligned. If the axes do not match, or even if the axes match but a displacement load is applied, it may cause poor construction (poor fusion).

仕切弁は、構造物周り、橋梁部、交差点部等の周囲に広いスペースを採ることができない場所に設置され、また設置位置が決まっている場合が多いため、接続するポリエチレン管との取り合いに対し、接合し易い位置に移動させることができない。これに加え、仕切弁本体は鋳鉄製で重く、ポリエチレン管との融着接続に際し、容易に接続しやすい向きに回動させる等の融通性がない。このため、水道工事においてソフトシール仕切弁のポリエチレン挿し口へポリエチレン管を接続する際に、ポリエチレン挿し口の軸心とポリエチレン管の軸心とを一致させるように回動可能な挿し口を備え、作業性を向上させたソフトシール仕切弁が求められている。 Gate valves are installed in places where it is difficult to take up a large space around structures, bridges, intersections, etc., and the installation location is often fixed, so it is difficult to deal with the connection with the polyethylene pipes to which they are connected. , cannot be moved to a position where it is easy to join. In addition, the gate valve body is made of cast iron and is heavy, and does not have the flexibility to easily rotate it in a direction that facilitates connection when fusion-splicing it to a polyethylene pipe. For this reason, when connecting a polyethylene pipe to the polyethylene socket of a soft seal gate valve in waterworks, a socket is provided that can be rotated to align the axis of the polyethylene socket with the axis of the polyethylene pipe. There is a need for soft seal gate valves with improved workability.

特許文献2には、ポリエチレン管路に可撓性を付与するフレキシブルボールジョイントのユニットと同ユニットを用いた配管方法が開示されている。このフレキシブルボールジョイントは、内周面が凹状球面に形成された受け口部に外周面が凸状球面に形成された挿入部を嵌め込み、受け口部に対して挿入部を回動可能としたものであり、このユニットをソフトシール仕切弁のポリエチレン挿し口に接続すると、挿し口付近の配管に可撓性を与えることができる。 Patent Document 2 discloses a flexible ball joint unit that imparts flexibility to a polyethylene pipe line and a piping method using the same unit. In this flexible ball joint, an insertion part whose outer peripheral surface is formed as a convex spherical surface is fitted into a socket part whose inner peripheral surface is formed with a concave spherical surface, so that the insertion part can be rotated with respect to the socket part. When this unit is connected to the polyethylene socket of a soft seal gate valve, flexibility can be given to the piping near the socket.

特許第6033640号公報Patent No. 6033640 特許第5748632号公報Patent No. 5748632

しかしながら、特許文献2のフレキシブルボールジョイントのユニットは、受口部の凹状球面と挿口部の凸状球面の球径を受口部及び挿口部に接続した管よりも大径に形成するとともに、挿口部の受口部側の端面に設けた通孔の径を接続した管の内径よりも大きく形成することにより、可撓時に挿口部の受口部側の端面が管の内径を遮らないように構成されている。この結果、常に受口部の内周面(凹状球面)の一部が露出することになるため、管路の内周面に対して凹段差部が生じており、この凹段差部が水の流れに乱流を発生させて圧力損失が生じることになる。 However, in the flexible ball joint unit of Patent Document 2, the concave spherical surface of the socket and the convex spherical surface of the socket are formed to have larger diameters than the socket and the pipe connected to the socket. By forming the diameter of the through hole on the end face of the insertion part on the socket side to be larger than the inner diameter of the connected pipe, the end face of the insertion part on the socket side matches the inner diameter of the pipe when it is flexible. It is constructed so as not to obstruct it. As a result, part of the inner peripheral surface (concave spherical surface) of the socket is always exposed, creating a recessed step on the inner peripheral surface of the pipe. This will cause turbulence in the flow and cause pressure loss.

また、この凹段差部内に管路及びバルブ内部の鉄錆が付着して赤水発生の原因となったり、凹段差部内に溜まった異物が挿口部の可撓時に噛み込みの原因となって耐震性を損なったりするおそれもある。 In addition, iron rust from inside the pipes and valves may adhere to this concave step, causing red water, and foreign matter that has accumulated within the concave step may become jammed when the insertion part is flexible, resulting in earthquake resistance. There is also a risk of harming your sexuality.

従って、特許文献2のフレキシブルボールジョイントのユニットをソフトシール仕切弁のポリエチレン挿し口に接続して可撓性を持たせても、現在のソフトシール仕切弁が有する長所を損なうおそれがあるだけでなく、地震発生時に可撓性を発揮することができなくなるおそれがある。 Therefore, even if the flexible ball joint unit of Patent Document 2 is connected to the polyethylene insertion port of the soft-seal gate valve to provide flexibility, there is a risk that not only will the advantages of the current soft-seal gate valve be impaired, but also , there is a risk that it will not be able to exhibit its flexibility in the event of an earthquake.

一方で、上記フレキシブルボールジョイントのユニットでは、受け口部と挿入部との継手部分が外部に露出しているため、このユニットを地中等に埋設した際に露出部分から砂や土などの異物が継手部分から内部に入り込む可能性がある。この場合、異物が受け口部と挿入部との間に噛み込まれ、作業不良が生じて可撓できなくなるおそれがある。 On the other hand, in the above-mentioned flexible ball joint unit, the joint between the socket and insertion part is exposed to the outside, so when this unit is buried underground, foreign matter such as sand and soil may leak into the joint from the exposed part. There is a possibility that it may get inside from the inside. In this case, there is a risk that foreign matter will be caught between the receptacle part and the insertion part, resulting in poor workmanship and the inability to flex.

本発明は、上記の課題点を解決するために開発したものであり、その目的とするところは、ソフトシール仕切弁の長所を損なうことなく可撓性を付与することができる樹脂管可撓ユニットと、その樹脂管可撓ユニットを用いた継手構造を備え、耐震性と水道工事時の作業性に優れ、埋設時にも内部への異物の浸入を防ぐことができる継手構造とバルブ、並びに可撓式ソフトシール仕切弁を提供することにある。 The present invention was developed to solve the above-mentioned problems, and its purpose is to provide a resin pipe flexible unit that can be provided with flexibility without sacrificing the advantages of soft seal gate valves. It has a joint structure that uses a flexible resin pipe unit, and has excellent earthquake resistance and workability during waterworks work, and a joint structure and valve that can prevent foreign matter from entering the interior even when buried, and a flexible unit. The purpose of the present invention is to provide a type soft seal gate valve.

上記目的を達成するため、請求項1に係る発明は、継手本体の接合部を拡径した状態の可撓接合部を設け、この可撓接合部の内周球面部に樹脂管部を接合した樹脂管可撓ユニットを可撓自在に挿入し、可撓接合部の外周面の開口端部と樹脂管部との間に防塵カバーを取付けた継手構造であって、防塵カバーの円筒部の底部内側から求心方向に沿って蛇腹状の凹凸部位の深さを浅く形成した環状凹凸部が設けられ、この環状凹凸部の内周端より樹脂管部の外周面まで延設部を延ばし、この延設部の内端を樹脂管部の外端軸心方向に沿った状態で長尺の延設筒部を形成し、この延設筒部の内周面に形成した挿通孔を樹脂管部の外周面に周面接触させると共に、延設筒部の先端外周面に樹脂管部の外周を締付けるための環状締付部を設けた防塵カバーを有する継手構造である。 In order to achieve the above object, the invention according to claim 1 provides a flexible joint with an enlarged diameter at the joint of the joint body, and a resin pipe part is joined to the inner spherical surface of the flexible joint. A joint structure in which a resin pipe flexible unit is flexibly inserted, and a dustproof cover is attached between the open end of the outer peripheral surface of the flexible joint and the resin pipe, and the bottom of the cylindrical part of the dustproof cover An annular uneven portion is provided in which the depth of the bellows-like uneven portion is made shallow from the inside along the centripetal direction . An elongated extension cylinder is formed with the inner end of the extension extending along the axial direction of the outer end of the resin pipe, and the insertion hole formed in the inner peripheral surface of the extension cylinder is inserted into the resin pipe. This is a joint structure having a dustproof cover that is brought into circumferential contact with the outer circumferential surface of the resin tube, and is provided with an annular tightening part for tightening the outer circumference of the resin pipe part on the outer circumferential surface of the distal end of the extended cylindrical part.

請求項2に係る発明は、環状締付部の内周先端に突起部を設け、この突起部で樹脂管部の外周を締付状態で把持した防塵カバーを有する継手構造である。 The invention according to claim 2 is a joint structure having a dustproof cover in which a protrusion is provided at the tip of the inner periphery of the annular tightening part, and the outer periphery of the resin pipe part is held in a tightened state by the protrusion.

請求項3に係る発明は、継手構造をソフトシール仕切弁のバルブ本体に適用した可撓式ソフトシール弁である。 The invention according to claim 3 is a flexible soft seal valve in which a joint structure is applied to a valve body of a soft seal gate valve .

請求項1に係る発明によると、円筒部を介して可撓接合部の開口端部に防塵カバーを取り付けでき、その取り付け後には、防塵カバーが環状凹凸部を介して樹脂管部の可撓に追従するように変形し、この樹脂管部との隙間の発生を防止して異物の浸入を確実に防止できる。この場合、環状凹凸部の内周端より延設筒部を設け、この延設筒部の先端部に樹脂管部を締付ける環状締付部を設けているため、この環状締付部と樹脂管部との間への異物の浸入を防ぎ、内周端付近の環状凹凸部の伸縮性を確保して樹脂管可撓時の樹脂管部への追従性を保持し、仮に埋設時に突き固めをおこなったとしても、固まった土や砂による環状締付部への影響を抑えて、環状締付部による締付け力を確実に維持して防塵性を発揮できる。
特に、可撓時に、樹脂管部と防塵カバー口に隙間が生じるおそれがなく、砂が入り込むおそれが全くなく、しかも、樹脂管部と防塵カバーの周面接触を広くし、その接触面のうち、延設筒部の先端外周面に環状締付部を設けたので、確実に締付けることが可能となり、その他の延設筒部で自由度を持たせたことにより追従性を向上させることができ、防塵カバー内に砂や土が浸入することを確実に防止できる。
また、請求項2に係る発明によると、防塵カバーを樹脂管部に挿入し易くするだけでなく、樹脂管部の挿入により突起部が拡径されることにより生じる復元力によって、樹脂管部の外周面を強く把持してダストシール効果とブレーキ機能を発揮するので、突起部の把持位置が移動することなく、カバー状態を維持することができる。
According to the invention according to claim 1, the dustproof cover can be attached to the open end of the flexible joint part through the cylindrical part, and after the attachment, the dustproof cover can be attached to the flexible resin pipe part through the annular uneven part. It deforms in a manner that follows the resin pipe, and prevents the generation of a gap with the resin pipe portion, thereby reliably preventing intrusion of foreign matter. In this case, an extending cylindrical portion is provided from the inner circumferential end of the annular uneven portion, and an annular tightening portion for tightening the resin pipe is provided at the tip of this extending cylindrical portion. It prevents foreign matter from entering between the inner circumferential end and the elasticity of the annular uneven part near the inner peripheral edge to maintain the ability to follow the resin pipe when it is flexible. Even if this is done, the influence of hardened soil or sand on the annular clamping part can be suppressed, and the clamping force of the annular clamping part can be reliably maintained and dustproof performance can be achieved.
In particular, when it is flexible, there is no risk of creating a gap between the resin pipe section and the dustproof cover opening, and there is no risk of sand getting in. Furthermore, the circumferential contact between the resin pipe section and the dustproof cover is widened, and the contact surface is Since an annular tightening part is provided on the outer circumferential surface of the tip of the extension tube, it is possible to tighten it reliably, and the other extension tube parts are provided with a degree of freedom, which improves followability. , it is possible to reliably prevent sand and soil from entering the dustproof cover.
Further, according to the invention according to claim 2, not only is it easy to insert the dustproof cover into the resin pipe part, but also the restoring force generated when the diameter of the protrusion is expanded by inserting the resin pipe part is used to make the resin pipe part. Since the outer peripheral surface is strongly gripped to exhibit the dust sealing effect and the braking function, the covered state can be maintained without moving the gripping position of the protrusion.

請求項3に係る発明によると、バルブ、特に、ソフトシール仕切弁本体の一端又は両端に設けた可撓接合部に可撓自在に樹脂管可撓ユニットを挿入して取り付けることにより、可撓式ソフトシール仕切弁を構成することができるので、ソフトシール仕切弁に接続したポリエチレン管が地震発生時に地盤の変動により変位しても、可撓接合部がこの変位に追随して可撓することによって影響を吸収し、ソフトシール仕切弁とポリエチレン管との継手部の破損を防ぎ、重要インフラである水道の機能を維持することができる。 According to the invention according to claim 3 , the valve, particularly the soft-seal gate valve, can be made flexible by inserting and attaching the resin pipe flexible unit to the flexible joint provided at one end or both ends of the main body. Since the soft-seal gate valve can be constructed, even if the polyethylene pipe connected to the soft-seal gate valve is displaced due to ground movement during an earthquake, the flexible joint follows this displacement and flexes. It absorbs the impact, prevents damage to the joint between the soft seal gate valve and the polyethylene pipe, and maintains the functionality of the water supply, which is an important infrastructure.

また、可撓接合部によりソフトシール仕切弁のポリエチレン挿し口が可撓自在となるので、接続工事の際に、ソフトシール仕切弁のポリエチレン挿し口の軸心とポリエチレン管の軸心との間にズレが生じてしまった場合には、ソフトシール仕切弁のポリエチレン挿し口を回動、可撓させるだけでソフトシール仕切弁のポリエチレン挿し口の軸心とポリエチレン管の軸心とを一致させることができるので、融着不良を防止することができるとともに、作業性を大幅に向上させることができる。 In addition, since the flexible joint allows the polyethylene insertion port of the soft seal gate valve to be flexible, there is a gap between the axis of the polyethylene insertion port of the soft seal gate valve and the axis of the polyethylene pipe during connection work. If misalignment occurs, simply rotate and flex the polyethylene insertion port of the soft seal gate valve to align the axis of the polyethylene insertion port of the soft seal gate valve with the axis of the polyethylene pipe. Therefore, poor fusion can be prevented and workability can be greatly improved.

さらに、樹脂管可撓ユニットを可撓自在に挿入して取り付ける可撓接合部において、拡径部の内周面が露出することにより生じる凹段差部(ポケット)の範囲を低減させているので、この凹段差部の存在により生じる乱流が原因となる圧力損失の発生、凹段差部の内部に付着する配水管内部の鉄錆の流入による赤水発生、凹段差部の内部に溜まった異物が原因となる噛み込み発生を抑制することができる。このため、弁箱底部がフラットなストレート構造であるために圧力損失がなく、また、異物が底部に堆積することがないというソフトシール仕切弁の特性を損ねることなくソフトシール仕切弁を可撓化することができる。 Furthermore, in the flexible joint where the resin tube flexible unit is flexibly inserted and attached, the range of the recessed step (pocket) caused by exposing the inner peripheral surface of the enlarged diameter part is reduced. Pressure loss occurs due to turbulent flow caused by the presence of this concave step, red water occurs due to the inflow of iron rust inside the water pipe that adheres to the inside of the concave step, and foreign matter accumulated inside the concave step It is possible to suppress the occurrence of jamming. Because of this, the bottom of the valve body has a flat, straight structure, so there is no pressure loss, and the soft seal gate valve can be made more flexible without compromising its characteristics of preventing foreign matter from accumulating on the bottom. can do.

本発明による可撓式ソフトシール仕切弁の一実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of a flexible soft seal gate valve according to the present invention. (a)は本発明の樹脂管可撓ユニットの左側面を示す図面であり、(b)はその正面図を示す図面である。(a) is a drawing showing the left side of the resin tube flexible unit of the present invention, and (b) is a drawing showing the front view. 図2(b)の断面図である。It is a cross-sectional view of FIG. 2(b). リング体を示す図面である。It is a drawing showing a ring body. 押輪を示す図面である。It is a drawing showing a press ring. 防塵カバーを示す図面である。It is a drawing showing a dustproof cover. 本発明の継手構造の組立工程を説明する図面である。It is a drawing explaining the assembly process of the joint structure of this invention. 本発明の継手構造の可撓部拡大図(組立完了状態)である。FIG. 3 is an enlarged view of the flexible portion of the joint structure of the present invention (in a fully assembled state). 本発明の継手構造の可撓部拡大図(可撓状態)である。FIG. 2 is an enlarged view of the flexible portion of the joint structure of the present invention (flexible state). 防塵カバーの他例を示す図面である。It is a drawing which shows another example of a dustproof cover. (a)は、図10の防塵カバーの取り付け状態を示す要部拡大断面図である。(b)は、(a)におけるA部拡大断面図である。(a) is an enlarged sectional view of a main part showing a state in which the dustproof cover of FIG. 10 is attached. (b) is an enlarged sectional view of section A in (a). 図11(a)における樹脂管可撓ユニットが可撓した状態を示す要部拡大断面図である。FIG. 12 is an enlarged sectional view of a main part showing a flexible state of the resin tube flexible unit in FIG. 11(a). 一端側に本発明の継手構造を、他端側にフランジを設けた可撓式ソフトシール仕切弁を示す図面である。It is a drawing showing a flexible soft seal gate valve having a joint structure of the present invention on one end side and a flange on the other end side. (a)は、継手部位に防塵カバーを取り付けた状態を示す一部切欠き正面図である。(b)は、(a)のB部拡大断面図である。(a) is a partially cutaway front view showing a state in which a dustproof cover is attached to a joint portion. (b) is an enlarged sectional view of section B in (a). (a)は、図14における継手部位の埋設状態を示す一部切欠き正面図である。(b)は、(a)の可撓状態を示す一部切欠き正面図である。(a) is a partially cutaway front view showing the buried state of the joint portion in FIG. 14; (b) is a partially cutaway front view showing the flexible state of (a).

以下に、本発明における樹脂管可撓ユニット及び継手構造とバルブ並びに可撓式ソフトシール仕切弁を図面に従って説明する。図1は可撓式ソフトシール仕切弁の一実施形態の断面図であり、図2は樹脂管可撓ユニット、図3は樹脂管可撓ユニットの断面図である。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, the resin pipe flexible unit, joint structure, valve, and flexible soft seal gate valve of the present invention will be explained with reference to the drawings. FIG. 1 is a sectional view of an embodiment of a flexible soft seal gate valve, FIG. 2 is a sectional view of a resin tube flexible unit, and FIG. 3 is a sectional view of a resin tube flexible unit.

図1において、可撓式ソフトシール仕切弁11は、水道用のソフトシール仕切弁からなるバルブ本体12の弁箱13の一端に接続用ソケット14を設け、他端に可撓接合部15を設けている。接続用ソケット14の外周側には樹脂管16が嵌め込まれ、この樹脂管16の外周側に円筒状締付けリング体17を嵌め込んで、接続用ソケット14に樹脂管16を固定している。なお、本図では、弁体13aは仕切弁を開放する位置にある。 In FIG. 1, a flexible soft-seal gate valve 11 includes a connection socket 14 at one end of a valve box 13 of a valve body 12, which is a soft-seal gate valve for water supply, and a flexible joint 15 at the other end. ing. A resin pipe 16 is fitted into the outer periphery of the connection socket 14, and a cylindrical tightening ring body 17 is fitted into the outer periphery of the resin pipe 16 to fix the resin pipe 16 to the connection socket 14. In this figure, the valve body 13a is in a position to open the gate valve.

また、可撓接合部15は、弁箱13の接合部18を拡径した状態で設けられており、開口端部19から樹脂管可撓ユニット21を挿入した状態で開口端部19に押輪23を取り付け、樹脂管可撓ユニット21を可撓可能に収容している。 The flexible joint 15 is provided with the joint 18 of the valve body 13 expanded in diameter, and the push ring 23 is attached to the open end 19 with the resin pipe flexible unit 21 inserted from the open end 19. is attached, and the resin tube flexible unit 21 is flexibly accommodated.

先ず、樹脂管可撓ユニット21について説明する。図2及び図3に示すように、樹脂管可撓ユニット21は、外周面26に係止部27を有し、かつ外端側にアール面28を持つ鍔部29を有する圧入スリーブ30と、この圧入スリーブ30に圧入固定した所定長さの樹脂管部32と、アール面28と連設する状態のボール面33を有し、且つ内周面34に抜け止め部35を有するリング体36とを備えている。 First, the resin tube flexible unit 21 will be explained. As shown in FIGS. 2 and 3, the resin tube flexible unit 21 includes a press-fit sleeve 30 having a locking portion 27 on the outer peripheral surface 26 and a collar portion 29 having a rounded surface 28 on the outer end side. A resin pipe portion 32 of a predetermined length press-fitted into the press-fit sleeve 30, a ring body 36 having a ball surface 33 connected to the rounded surface 28, and having a retaining portion 35 on the inner circumferential surface 34. It is equipped with

圧入スリーブ30は、図3に示すように、外周面26に係止部27を突設した管状体の外端側に鍔部29を設けており、鍔部29の外周面側にはアール面28が、内周面側にはテーパー面38が形成されている。本実施例では、圧入スリーブ30は球状黒鉛鋳鉄(FCD450-10)製であり、全面にエポキシ樹脂により粉体塗装を施している。 As shown in FIG. 3, the press-fit sleeve 30 has a flange 29 on the outer end side of a tubular body with a locking part 27 protruding from the outer circumferential surface 26, and a rounded surface on the outer circumferential side of the flange 29. 28, a tapered surface 38 is formed on the inner peripheral surface side. In this embodiment, the press-fit sleeve 30 is made of spheroidal graphite cast iron (FCD450-10), and the entire surface is powder coated with epoxy resin.

なお、圧入スリーブ30の鍔部29の外周面は、後述する理由により、可撓接合部15の内周面に形成された球面部46と略同一の球面半径を有するアール面28に形成した場合に本発明の効果を最大限に得ることができるが、鍔部29の外周面26をその接線角度に準じた傾斜面に形成したり、又は鍔部29を適宜な厚みの単なる平板状に形成したりしても、限定的ではあるが本発明の効果を得ることができる。 Note that when the outer circumferential surface of the flange portion 29 of the press-fit sleeve 30 is formed into a rounded surface 28 having approximately the same spherical radius as the spherical surface portion 46 formed on the inner circumferential surface of the flexible joint portion 15, for reasons described later. However, the effects of the present invention can be maximized by forming the outer circumferential surface 26 of the flange 29 into an inclined surface according to the tangential angle thereof, or by forming the flange 29 into a simple flat plate shape with an appropriate thickness. The effects of the present invention can also be obtained, although in a limited manner.

圧入スリーブ30は、樹脂管部32を圧入する側の外径をやや細く、且つ樹脂管部の内径よりも大きく形成するとともに、外周面26に突設した係止部27の高さが、樹脂管部32を圧入する側から鍔部29に近づくに従って増加するように形成している。また、樹脂管部32入口内周に面取りを設け、これにより、圧入スリーブ30の樹脂管部32への圧入作業をやり易くするとともに、圧入固定した後に圧入スリーブ30から樹脂管部32が抜けにくくなる効果を発揮する。 The press-fitting sleeve 30 has an outer diameter slightly smaller on the side into which the resin pipe portion 32 is press-fitted and larger than the inner diameter of the resin pipe portion, and the height of the locking portion 27 protruding from the outer circumferential surface 26 is larger than the resin pipe portion 32. It is formed so that it increases as it approaches the collar part 29 from the side where the pipe part 32 is press-fitted. In addition, a chamfer is provided on the inner periphery of the entrance of the resin pipe part 32, thereby making it easier to press-fit the press-fit sleeve 30 into the resin pipe part 32, and making it difficult for the resin pipe part 32 to come off from the press-fit sleeve 30 after being press-fitted and fixed. It has a certain effect.

圧入スリーブ30の鍔部29の内周面側にテーパー面38を形成することにより、弁箱13のバルブ本体12内部のボデー流路39と圧入スリーブ30の内周流路40とがスムーズに繋がるようにして乱流の発生を抑制している。また、圧入スリーブ30の内周流路40の径は、図1に示すように接続ソケット14の内径と略同一であるとともに、図3に示すように樹脂管部32の内径とも略同一であるため、略同一の断面積を有する流路がスムーズに連続して構成されるので、圧力損失の発生を抑制することができる。 By forming a tapered surface 38 on the inner circumferential surface side of the flange 29 of the press-fit sleeve 30, the body passage 39 inside the valve body 12 of the valve box 13 and the inner circumferential passage 40 of the press-fit sleeve 30 are smoothly connected. This suppresses the occurrence of turbulence. Furthermore, the diameter of the inner peripheral flow path 40 of the press-fit sleeve 30 is approximately the same as the inner diameter of the connection socket 14 as shown in FIG. Since the flow channels having substantially the same cross-sectional area are configured to be smoothly continuous, the occurrence of pressure loss can be suppressed.

なお、圧入スリーブ30の鍔部29の内周面側に形成するテーパー面38の開き角度については、通常使用時と可撓時の流路面積の確保、圧力損失の発生に影響を与えるので、これらへの影響を十分にトレードオフして決定する必要があるが、樹脂管可撓ユニット21が可撓した時でもバルブ本体12内部のボデー流路39と圧入スリーブ30の内周流路40とができるだけスムーズに繋がって圧力損失の発生を抑制できるように、樹脂管可撓ユニット21の可撓角度θより若干大きい角度、例えば呼び径75の可撓角度が15度の場合には、15度を超え20度以下の角度に設定することが好ましい。 Note that the opening angle of the tapered surface 38 formed on the inner peripheral surface of the flange 29 of the press-fit sleeve 30 affects securing the flow path area and generating pressure loss during normal use and when flexible. It is necessary to make a decision by sufficiently trading off the influence on these, but even when the resin tube flexible unit 21 is flexible, the body flow path 39 inside the valve body 12 and the inner peripheral flow path 40 of the press-fit sleeve 30 can be maintained as much as possible. In order to connect smoothly and suppress the occurrence of pressure loss, the angle is slightly larger than the flexibility angle θ of the resin tube flexible unit 21, for example, if the flexibility angle of the nominal diameter 75 is 15 degrees, the angle is greater than 15 degrees. It is preferable to set the angle to 20 degrees or less.

樹脂管部32は水道配水用ポリエチレン管が好ましく、呼び径50又は75のポリエチレン管を使用することができる。本実施例では、呼び径75のポリエチレン管を使用する場合について説明している。 The resin pipe portion 32 is preferably a polyethylene pipe for water distribution, and a polyethylene pipe with a nominal diameter of 50 or 75 mm can be used. In this embodiment, a case is explained in which a polyethylene pipe with a nominal diameter of 75 is used.

図4に示すように、リング体36の外周面はボール面33に形成され、内周面34には抜け止め部35とシール部材取付け溝41が凹設されている。抜け止め部35は、シール部材取付け溝41よりも圧入スリーブ30の鍔部29と当接する面に近い部分に設けられているが、抜け止め部35は、圧入スリーブ30の外周面26に突設させた係止部27と略対向することによって樹脂管部32の抜け止め効果を強力に発揮するので、圧入スリーブ30で係止部27の高さが十分に高く形成されている鍔部29の近傍部分に対応する部分に抜け止め部35を設けるようにしたためである。 As shown in FIG. 4, the outer peripheral surface of the ring body 36 is formed into a ball surface 33, and the inner peripheral surface 34 is provided with a retaining portion 35 and a seal member mounting groove 41. The retaining portion 35 is provided in a portion closer to the surface of the press-fit sleeve 30 that comes into contact with the flange 29 than the seal member mounting groove 41; By substantially opposing the locking portion 27, the resin tube portion 32 is strongly prevented from coming off. This is because the retaining portion 35 is provided in a portion corresponding to the neighboring portion.

また、リング体36のボール面33の球面球径は、圧入スリーブ30の鍔部29の外周面側に形成されたアール面28の球面球径と略等しく設定しているので、圧入スリーブ30の鍔部29にリング体36を当接させると、リング体36のボール面33と圧入スリーブ30のアール面28とが連設した状態となり、外周球面形状を形成する。本実施例では、リング体36はステンレス鋼(SUS304)製であり、無塗装で使用している。リング体36の内周面34の径は、圧入スリーブ30が挿入された樹脂管部32の外径よりもやや小径となるように設定している。これにより、リング体36を樹脂管部32の外周に圧入固定することができる。 Further, since the spherical diameter of the ball surface 33 of the ring body 36 is set to be approximately equal to the spherical diameter of the rounded surface 28 formed on the outer peripheral surface side of the flange 29 of the press-fit sleeve 30, When the ring body 36 is brought into contact with the collar portion 29, the ball surface 33 of the ring body 36 and the rounded surface 28 of the press-fit sleeve 30 are in a continuous state, forming an outer spherical shape. In this embodiment, the ring body 36 is made of stainless steel (SUS304) and is used without painting. The diameter of the inner peripheral surface 34 of the ring body 36 is set to be slightly smaller than the outer diameter of the resin pipe section 32 into which the press-fit sleeve 30 is inserted. Thereby, the ring body 36 can be press-fitted and fixed to the outer periphery of the resin pipe portion 32.

圧入スリーブ30を樹脂管部32の内周側に圧入した後、シール部材取付け溝41にシール部材(ニトリルゴム製のOリング)42を配設したリング体36を樹脂管部32の外周側に圧入すると、図3に示すように、圧入スリーブ30の外周面26に突設された係止部27が樹脂管部32の内周面43に食い込むとともに、リング体36の内周面34に凹設された抜け止め部35に樹脂管部32の外周面37が食い込むことにより、樹脂管部32と圧入スリーブ30とリング体36とが強固に固定されて一体化した樹脂管可撓ユニット21を構成することができる。 After the press-fitting sleeve 30 is press-fitted into the inner circumferential side of the resin pipe part 32, a ring body 36 with a seal member (O-ring made of nitrile rubber) 42 arranged in the seal member mounting groove 41 is attached to the outer circumferential side of the resin pipe part 32. When press-fitted, as shown in FIG. 3, the locking part 27 protruding from the outer circumferential surface 26 of the press-fitting sleeve 30 bites into the inner circumferential surface 43 of the resin tube part 32, and a recess is formed in the inner circumferential surface 34 of the ring body 36. The outer circumferential surface 37 of the resin pipe part 32 bites into the provided retaining part 35, so that the resin pipe part 32, the press-fit sleeve 30, and the ring body 36 are firmly fixed, thereby forming the integrated resin pipe flexible unit 21. Can be configured.

これらの圧入作業は、仕切弁の接続用ソケットの外周側に樹脂管を圧入した後、樹脂管の外周側に円筒状締付けリング体を圧入する際に使用している圧入機を使用して行うことができるので、製造コストを押し上げる要因となることはない。なお、抜け止め部35やシール部材の配置は任意である。 These press-fitting operations are performed using the same press-fitting machine that is used to press-fit the cylindrical tightening ring body to the outer circumference of the resin pipe, after press-fitting the resin pipe to the outer circumference of the connection socket of the gate valve. Therefore, it does not become a factor that increases manufacturing costs. Note that the arrangement of the retaining portion 35 and the sealing member is arbitrary.

樹脂管可撓ユニットは、接合部18の可撓接合部15内周面の球面部46に対して、樹脂管部32を可撓自在に挿入可能であれば、上記構造に限ることはなく、各種の内部構造に設けることが可能である。さらに、この樹脂管可撓ユニットを接合するバルブ本体12をソフトシール仕切弁11に適用しているが、ソフトシール仕切弁以外のバルブに適用してもよい。 The resin tube flexible unit is not limited to the above structure as long as the resin tube portion 32 can be flexibly inserted into the spherical surface portion 46 of the inner peripheral surface of the flexible joint portion 15 of the joint portion 18. It can be provided in various internal structures. Furthermore, although the valve body 12 to which this resin tube flexible unit is joined is applied to the soft seal gate valve 11, it may be applied to valves other than soft seal gate valves.

次に、バルブ本体12の弁箱13の他端側に設けた可撓接合部15について説明する。
前述したように、可撓接合部15は、弁箱13の接合部18を拡径した状態で設けられており、開口端部19を有するとともに、内周面に凹状の球面部46を備えている。この球面部46の球面球径は、圧入スリーブ30の鍔部29のアール面28の球面球径及びリング体36のボール面33の球面球径と略等しく形成している。
Next, the flexible joint 15 provided on the other end side of the valve body 13 of the valve body 12 will be explained.
As described above, the flexible joint portion 15 is provided with the joint portion 18 of the valve box 13 expanded in diameter, and has an open end portion 19 and a concave spherical portion 46 on the inner circumferential surface. There is. The spherical diameter of the spherical portion 46 is approximately equal to the spherical diameter of the rounded surface 28 of the flange 29 of the press-fit sleeve 30 and the spherical diameter of the ball surface 33 of the ring body 36.

可撓接合部15の内周面には、球面部46に続いてシール部材47を装着するための段部48を設けている。また、可撓接合部15の開口端部19には、押輪23を取り付けるためのボルト穴52を円周状に設けるとともに、開口端部19の外周には後述する防塵カバー61を係止して取り付けるための突起部53を環状に突設している。 A stepped portion 48 is provided on the inner circumferential surface of the flexible joint portion 15 following the spherical portion 46 to which a sealing member 47 is mounted. Further, the open end 19 of the flexible joint 15 is provided with bolt holes 52 circumferentially for attaching the press ring 23, and a dustproof cover 61, which will be described later, is secured to the outer periphery of the open end 19. A protrusion 53 for attachment is protruded in an annular shape.

押輪23は、図5(b)に示すように、中央に樹脂管可撓ユニット21の樹脂管部32を挿通させるための挿通孔55を設けた略ドーナツ状に形成され、挿通孔55の外周にはボルト穴56を円周状に設けている。また、図5(a)に示すように、押輪23の厚み方向に段部57を形成し、この段部57を可撓接合部15の開口端部19内に挿入して可撓接合部15の軸心と押輪23の軸心を一致させた状態で押輪23を可撓接合部15の開口端部19に取り付けられるようにしている。 As shown in FIG. 5(b), the press ring 23 is formed into a substantially donut shape with an insertion hole 55 in the center for inserting the resin tube part 32 of the resin tube flexible unit 21, and the outer periphery of the insertion hole 55. Bolt holes 56 are provided in a circumferential manner. Further, as shown in FIG. 5(a), a stepped portion 57 is formed in the thickness direction of the press ring 23, and this stepped portion 57 is inserted into the open end 19 of the flexible joint 15. The press ring 23 can be attached to the open end 19 of the flexible joint 15 with the axis of the press ring 23 aligned with the axis of the press ring 23.

また、段部57側の挿通孔55の内周側を当接アール面58に形成し、この当接アール面58の球面球径を可撓接合部15の内周面に設けた球面部46の球面球径と同じにしているので、押輪23を可撓接合部15の開口端部19に取り付けると、押輪23の当接アール面58と可撓接合部15の球面部46は、中心と球面球径が同一である球面を構成する。前述したように、段部57の存在により可撓接合部15の軸心と押輪23の軸心を確実に一致させることができるため、単に可撓接合部15の開口端部19に押輪23を取り付けるだけでこの様な効果を得ることができる。さらに、押輪23を可撓接合部15の開口端部19に取り付けると、押輪23の先端面、可撓接合部15の内周面、及びリング体36のボール面33により囲まれた空間は、シール部材47を装着する収容部を形成する。 Further, the inner peripheral side of the insertion hole 55 on the side of the stepped portion 57 is formed into a contact radius surface 58, and the spherical surface portion 46 is provided with the spherical diameter of the contact radius surface 58 on the inner peripheral surface of the flexible joint portion 15. When the press ring 23 is attached to the open end 19 of the flexible joint 15, the contact radius surface 58 of the press ring 23 and the spherical part 46 of the flexible joint 15 are aligned with the center. Construct a spherical surface with the same diameter. As described above, the presence of the stepped portion 57 makes it possible to ensure that the axis of the flexible joint 15 and the axis of the press ring 23 are aligned, so that the press ring 23 is simply attached to the open end 19 of the flexible joint 15. You can get this kind of effect just by installing it. Furthermore, when the press ring 23 is attached to the open end 19 of the flexible joint 15, the space surrounded by the tip end surface of the press ring 23, the inner peripheral surface of the flexible joint 15, and the ball surface 33 of the ring body 36 is A housing portion for mounting the seal member 47 is formed.

挿通孔55の段部57と反対側は、端面59に向かって拡径する拡径穴60に形成することにより、可撓時における樹脂管可撓ユニット21の樹脂管部32の可撓域を確保するとともに、拡径穴60の内周面に樹脂管可撓ユニット21の樹脂管部32が当接した段階で、樹脂管可撓ユニット21の可撓範囲を規制できるようにしている。 The side opposite to the stepped portion 57 of the insertion hole 55 is formed with an enlarged diameter hole 60 whose diameter increases toward the end surface 59, thereby reducing the flexible region of the resin pipe portion 32 of the resin pipe flexible unit 21 when flexible. At the same time, the flexible range of the resin pipe flexible unit 21 can be restricted at the stage when the resin pipe portion 32 of the resin pipe flexible unit 21 comes into contact with the inner circumferential surface of the enlarged diameter hole 60.

本実施例では、押輪23は、前述の圧入スリーブ30と同様に球状黒鉛鋳鉄(FCD450-10)製であり、全面にエポキシ樹脂により粉体塗装を施している。 In this embodiment, the press ring 23 is made of spheroidal graphite cast iron (FCD450-10) like the press-fit sleeve 30 described above, and the entire surface is powder coated with epoxy resin.

本実施形態では、上記可撓接合部がバルブ本体12の一端に設けられているが、バルブ本体、又は図示しない継手本体の一端又は両端に設けることができる。 In this embodiment, the flexible joint is provided at one end of the valve body 12, but it may be provided at one or both ends of the valve body or a joint body (not shown).

防塵カバー61は、可撓接合部15の開口端部19と樹脂管部32との間に取り付けられる。防塵カバー61は、例えばゴム等の柔軟な材質で形成され、図6に示すように、開口端62と底部63とを有する円筒状で、円筒の側面64の厚みを底部63から開口端62に向かって連続的に増加させて形成している。また、開口端62の内周側には、可撓接合部15の開口端部19の外周に環状に突設した突起部53を挿嵌するための溝部65を設けている。 The dustproof cover 61 is attached between the open end 19 of the flexible joint 15 and the resin pipe section 32. The dustproof cover 61 is made of a flexible material such as rubber, and has a cylindrical shape with an open end 62 and a bottom 63 as shown in FIG. It is formed by continuously increasing towards the direction. Furthermore, a groove 65 is provided on the inner circumferential side of the open end 62 into which the protrusion 53 that protrudes annularly from the outer circumference of the open end 19 of the flexible joint 15 is inserted.

防塵カバー61の底部63の中央には樹脂管可撓ユニット21の樹脂管部32の外径よりも小径の挿通孔66を形成し、この挿通孔66の内周に先端が尖った形状の突起部67を設けるとともに、図6に示すように、この挿通孔66の周りに同心円状に奥行幅を変えて折り目を形成した蛇腹部68を設けている。 An insertion hole 66 having a smaller diameter than the outer diameter of the resin tube portion 32 of the resin tube flexible unit 21 is formed in the center of the bottom portion 63 of the dustproof cover 61, and a projection with a pointed tip is formed on the inner periphery of the insertion hole 66. As shown in FIG. 6, a bellows portion 68 is provided concentrically around the insertion hole 66 with a folded portion 67 having a varying depth and width.

防塵カバー61の底部63に挿通孔66と同心円状に奥行幅を変えた蛇腹部68を形成したことにより、防塵カバー61に十分な伸縮性を与えることができるようになり、可撓時の樹脂管可撓ユニット21の動きに追随して防塵カバー61が柔軟に変形して、カバー状態を維持することができる。蛇腹部68の凹凸部位の深さを大きく設けるようにすれば、可撓性を向上して樹脂管可撓ユニット21の動きに追従しやすくなる。 By forming a bellows part 68 with varying depth concentrically with the insertion hole 66 on the bottom 63 of the dustproof cover 61, the dustproof cover 61 can be given sufficient elasticity, and the resin when flexible is The dustproof cover 61 is flexibly deformed following the movement of the flexible tube unit 21, and can maintain the covered state. By increasing the depth of the uneven portion of the bellows portion 68, flexibility is improved and the movement of the resin tube flexible unit 21 can be easily followed.

また、防塵カバー61の側面64を底部63から開口端62に向かって連続的に厚みを増加させて形成し、厚みが最も増加した開口端62内周側に溝部65を設けているため、この溝部65は変形しにくく十分な保持力を有しており、樹脂管可撓ユニット21の可撓時に防塵カバー61が変形しても、この溝部65内に突起部53を保持し続け、防塵カバー61が可撓接合部15から外れることを防止することができる。 In addition, the side surface 64 of the dustproof cover 61 is formed with a thickness that increases continuously from the bottom 63 toward the open end 62, and the groove 65 is provided on the inner peripheral side of the open end 62 where the thickness increases the most. The groove 65 is difficult to deform and has sufficient holding power, so even if the dustproof cover 61 is deformed when the resin tube flexible unit 21 is flexible, the protrusion 53 continues to be held within the groove 65 and the dustproof cover is 61 can be prevented from coming off from the flexible joint 15.

防塵カバー61の挿通孔66側には、内周方向に突出するような肉厚で環状の締付部69が設けられる。この締付部69は、樹脂管部32の接続口側の蛇腹部68から外方に飛び出さない位置に、樹脂管部32外周に接するように適宜の厚さ及び長さで形成される。この締付部69を設けたことにより、挿通孔66の口径が樹脂管部32の外径よりも小さくなる。そのため、防塵カバー61は、挿通孔66を拡径するようにして樹脂管部32に装着するようにする。 A thick, annular tightening portion 69 is provided on the insertion hole 66 side of the dustproof cover 61 so as to protrude in the inner circumferential direction. The tightening portion 69 is formed with an appropriate thickness and length so as to be in contact with the outer periphery of the resin tube portion 32 at a position that does not protrude outward from the bellows portion 68 on the connection port side of the resin tube portion 32 . By providing this tightening portion 69, the diameter of the insertion hole 66 becomes smaller than the outer diameter of the resin pipe portion 32. Therefore, the dustproof cover 61 is attached to the resin pipe portion 32 by enlarging the diameter of the insertion hole 66.

さらに、防塵カバー61には、樹脂管可撓ユニット21の樹脂管部32の外径よりも小径に形成した挿通孔66の内周側に先端が尖った形状の突起部(リップ部)67を設けている。この突起部67は、防塵カバー61へ樹脂管可撓ユニット21の樹脂管部32を挿入し易くするだけでなく、樹脂管部32の挿入により突起部67が拡径されることにより生じる復元力によって樹脂管部32の外周面37を強く把持してダストシール効果とブレーキ機能を発揮するので、樹脂管可撓ユニット21が可撓して防塵カバー61が変形しても突起部67の把持位置は移動することがなく、ダストシール機能を損なわずにカバー状態を維持することができる。 Further, the dustproof cover 61 has a protrusion (lip portion) 67 with a pointed tip on the inner circumferential side of the insertion hole 66 which is formed to have a smaller diameter than the outer diameter of the resin tube portion 32 of the resin tube flexible unit 21. It is set up. This protrusion 67 not only makes it easier to insert the resin tube section 32 of the resin tube flexible unit 21 into the dustproof cover 61, but also provides a restoring force generated by the diameter of the protrusion 67 being expanded by inserting the resin tube section 32. Since the outer circumferential surface 37 of the resin pipe portion 32 is strongly gripped to exert a dust sealing effect and a braking function, even if the resin pipe flexible unit 21 is flexible and the dustproof cover 61 is deformed, the gripping position of the protrusion 67 remains unchanged. It does not move and can maintain the cover state without impairing the dust seal function.

本実施例では、防塵カバー61は、耐水性、耐候性、耐寒性、耐オゾン性に優れるエチレンプロピレンゴム(EPDM)製を使用している。 In this embodiment, the dustproof cover 61 is made of ethylene propylene rubber (EPDM), which has excellent water resistance, weather resistance, cold resistance, and ozone resistance.

次いで、図7により、本発明の樹脂管可撓ユニットと継手構造の組立工程を説明する。最初の工程は樹脂管可撓ユニットの組立工程である。この工程では、図7(a)に示すように、図示しない治具により圧入スリーブ30の鍔部29を支持し、樹脂管部32を押圧して圧入スリーブ30を樹脂管部32の内周側に圧入する。このとき、樹脂管部32を拡径しながら圧入スリーブ30が圧入されるので、圧入スリーブ30の外周面26に突設した係止部27は樹脂管部32の内周面43に食い込んだ状態で圧入固定される。 Next, referring to FIG. 7, the assembly process of the resin pipe flexible unit and joint structure of the present invention will be explained. The first step is assembling the resin tube flexible unit. In this step, as shown in FIG. 7(a), the flange 29 of the press-fit sleeve 30 is supported by a jig (not shown), and the resin pipe part 32 is pressed to move the press-fit sleeve 30 to the inner peripheral side of the resin pipe part 32. Press fit into. At this time, since the press-fit sleeve 30 is press-fitted while expanding the diameter of the resin pipe part 32, the locking part 27 protruding from the outer peripheral surface 26 of the press-fit sleeve 30 is in a state where it bites into the inner peripheral surface 43 of the resin pipe part 32. It is press-fitted and fixed.

次の工程は、図7(b)に示すように、樹脂管部32の内周側に圧入固定した圧入スリーブ30の鍔部29を図示しない治具により支持し、シール部材取付け溝41にシール部材42を配設したリング体36を樹脂管部32の外周側に圧入する。このとき、リング体36の内周面34は、圧入スリーブ30を圧入したことにより拡径された樹脂管部32の外表面を強く押圧しながら圧入されるため、リング体36の内周面34に凹設された抜け止め部35内に樹脂管部32の外周面37が食い込んだ状態で、圧入スリーブ30を圧入固定した樹脂管部32とリング体36とが圧入固定される。このとき、圧入スリーブ30の係止部27とリング体36の抜け止め部35が略対向位置に配置されることにより、強固に固定されて一体化した樹脂管可撓ユニット21が構成される。 In the next step, as shown in FIG. 7(b), the flange 29 of the press-fit sleeve 30 press-fitted and fixed to the inner peripheral side of the resin tube 32 is supported by a jig (not shown), and a seal is placed in the seal member mounting groove 41. The ring body 36 with the member 42 disposed thereon is press-fitted onto the outer circumferential side of the resin pipe portion 32. At this time, the inner circumferential surface 34 of the ring body 36 is press-fitted while strongly pressing the outer surface of the resin pipe portion 32 whose diameter has been expanded by press-fitting the press-fit sleeve 30. The ring body 36 is press-fitted and fixed to the resin pipe part 32 to which the press-fit sleeve 30 is press-fitted, with the outer circumferential surface 37 of the resin pipe part 32 biting into the retaining part 35 recessed in the ring body. At this time, the locking portion 27 of the press-fit sleeve 30 and the retaining portion 35 of the ring body 36 are arranged at substantially opposing positions, thereby forming the resin tube flexible unit 21 that is firmly fixed and integrated.

次いで継手構造の組立工程に移行する。この工程では、図7(c)に示すように、可撓接合部15の段部48にシール部材47を装着し、前工程で完成させた樹脂管可撓ユニット21を開口端部19から可撓接合部15内に挿入する。その後、樹脂管可撓ユニット21の樹脂管部32を挿通孔55に挿通させながら押輪23の段部57を可撓接合部15の開口端部19内に挿入した状態で、可撓接合部15の開口端部19に取り付ける。 Next, the process moves to the assembly process of the joint structure. In this step, as shown in FIG. 7(c), a sealing member 47 is attached to the stepped portion 48 of the flexible joint 15, and the resin tube flexible unit 21 completed in the previous step is inserted through the open end 19. Insert into the flexible joint 15. Thereafter, while inserting the resin tube part 32 of the resin tube flexible unit 21 into the insertion hole 55 and inserting the stepped part 57 of the press ring 23 into the open end 19 of the flexible joint part 15, the flexible joint part 15 is inserted. Attach it to the open end 19 of the.

次に、図7(d)に示すように、押輪23のボルト穴56にボルト70を通し、可撓接合部15の開口端部19に円周状に設けたボルト穴52にボルトを螺着すると継手構造が完成する。このとき、押輪23の段部57を可撓接合部15の開口端部19内に挿入した状態で取り付けているので、可撓接合部15の軸心と押輪23の軸心とが確実に一致しており、また、可撓接合部15の開口端部19に押輪23をしっかりとボルト締めしているため、可撓接合部15の球面部46と押輪23の当接アール面58は、球面球径が同一である凹状の内周球面を連設して構成する。 Next, as shown in FIG. 7(d), the bolts 70 are passed through the bolt holes 56 of the push ring 23, and the bolts are screwed into the bolt holes 52 provided circumferentially in the open end 19 of the flexible joint 15. The joint structure is then completed. At this time, since the stepped portion 57 of the press ring 23 is inserted into the open end 19 of the flexible joint 15, the axis of the flexible joint 15 and the axis of the press ring 23 are surely aligned. In addition, since the push ring 23 is firmly bolted to the open end 19 of the flexible joint 15, the spherical portion 46 of the flexible joint 15 and the abutment radius surface 58 of the push ring 23 are spherical. It is constructed by consecutively arranging concave inner circumferential spherical surfaces with the same spherical diameter.

前述したように、樹脂管可撓ユニット21の圧入スリーブ30の鍔部29のアール面28とリング体36のボール面33は連設した外周球面形状を形成しているが、可撓接合部15の球面部46、押輪23の当接アール面58、圧入スリーブ30のアール面28及びリング体36のボール面33の球体球径を等しく形成しているので、可撓接合部15の球面部46と押輪23の当接アール面58が連設した内周球面は、樹脂管可撓ユニット21のアール面28とリング体36のボール面33が連設した外周球面を回動、可撓自在に支持することができる。なお、可撓接合部15の開口端部19に押輪23をバヨネット方式で取り付けた場合には、押輪23を確実に密着させて開口端部19に取り付けることができずにガタが生じるので、可撓接合部の球面部と押輪の当接アール面が連設する面は正しい内周球面を構成することができないため、樹脂管可撓ユニットの回動、可撓が影響を受けたり、樹脂管可撓ユニットが回動、可撓する際に回転軌道から外れ、リング体の端面で可撓接合部の球面部を傷付けたりするおそれがある。 As described above, the rounded surface 28 of the flange 29 of the press-fit sleeve 30 of the resin tube flexible unit 21 and the ball surface 33 of the ring body 36 form a continuous outer peripheral spherical shape. The spherical portion 46 of the flexible joint 15, the contact radius surface 58 of the push ring 23, the radius surface 28 of the press-fit sleeve 30, and the ball surface 33 of the ring body 36 are formed to have the same diameter. The inner spherical surface to which the contact radius surface 58 of the push ring 23 is connected can rotate and flexibly rotate the outer spherical surface to which the radius surface 28 of the resin tube flexible unit 21 and the ball surface 33 of the ring body 36 are connected. can be supported. Note that if the press ring 23 is attached to the open end 19 of the flexible joint 15 using a bayonet method, the press ring 23 cannot be attached to the open end 19 in a secure manner, causing play. The surface where the spherical part of the flexible joint and the contact radius surface of the press ring cannot form a correct inner spherical surface, so the rotation and flexibility of the resin pipe flexible unit may be affected, and the resin pipe may When the flexible unit rotates and flexes, it may come off the rotational path and the end face of the ring body may damage the spherical part of the flexible joint.

なお、押輪23を可撓接合部15の開口端部19に接合する方法は、上記のボルト止めに限定されるわけではなく、可撓接合部15の球面部46と押輪23の当接アール面58が連設して正しい内周球面を構成する条件を満足すればよいのであるから、例えば、可撓接合部15の開口端部19の内周側にメネジ部を、押輪23の段部57にオネジ部を形成し、可撓接合部15に押輪23を螺着するようにしてもよい。 Note that the method of joining the push ring 23 to the open end 19 of the flexible joint 15 is not limited to the bolting method described above, and the method of joining the press ring 23 to the open end 19 of the flexible joint 15 is not limited to the bolting method described above. 58 are connected in a row to form a correct inner spherical surface. A male screw portion may be formed in the flexible joint portion 15, and the press ring 23 may be screwed onto the flexible joint portion 15.

最後に防塵カバー61を取り付けることにより、樹脂管可撓ユニット21の回動、可撓性に影響を与えることなく防塵化し、押輪23とリング体36との間に異物が噛み込むのを防止することができる。 Finally, by attaching the dustproof cover 61, the resin tube flexible unit 21 is dustproofed without affecting its rotation and flexibility, and foreign objects are prevented from getting caught between the press ring 23 and the ring body 36. be able to.

以下に、本発明の継手構造の細部及び動作について説明する。図8は、本発明の継手構造の可撓部拡大図であり、組立完了時を示している。通常、継手構造72は、本図に示すように、可撓接合部15の軸心73と樹脂管可撓ユニット21の軸心74とが一致した状態で使用される。 The details and operation of the joint structure of the present invention will be explained below. FIG. 8 is an enlarged view of the flexible portion of the joint structure of the present invention, showing the state when the assembly is completed. Normally, the joint structure 72 is used in a state where the axis 73 of the flexible joint 15 and the axis 74 of the resin tube flexible unit 21 are aligned, as shown in this figure.

図8に示すように、可撓接合部15の球面部46と押輪23の当接アール面58が連設した内周球面内に、樹脂管可撓ユニット21の圧入スリーブ30の鍔部29のアール面28とリング体36のボール面33が連設した外周球面を内包している。可撓接合部15の球面部46と押輪23の当接アール面58が連設した内周球面の球径と、樹脂管可撓ユニット21の圧入スリーブ30の鍔部29のアール面28とリング体36のボール面33が連設した外周球面の球径は略等しく、また中心75を共有しているので、樹脂管可撓ユニット21は、可撓接合部15の球面部46と押輪23の当接アール面58が連設した内周球面内で回動、可撓自在に支持される。 As shown in FIG. 8, the flange 29 of the press-fit sleeve 30 of the resin tube flexible unit 21 is located within the inner spherical surface where the spherical surface 46 of the flexible joint 15 and the contact radius surface 58 of the press ring 23 are connected. The rounded surface 28 and the ball surface 33 of the ring body 36 enclose a continuous outer peripheral spherical surface. The spherical diameter of the inner spherical surface where the spherical part 46 of the flexible joint part 15 and the contact rounded surface 58 of the push ring 23 are connected, and the rounded surface 28 of the collar part 29 of the press-fit sleeve 30 of the resin tube flexible unit 21 and the ring The spherical diameters of the outer peripheral spherical surfaces connected to the ball surfaces 33 of the body 36 are approximately equal and they share the center 75. The abutting rounded surfaces 58 are rotatably and flexibly supported within the continuous inner circumferential spherical surface.

これにより、樹脂管可撓ユニット21は可撓接合部15に回動、可撓自在に接続されるので、地震発生により樹脂管可撓ユニット21の樹脂管部32に接続した水道管が地盤の変動により変位した場合には、これに追従して回動及び可撓することができる。本実施例では、樹脂管可撓ユニット21の可撓域を約15度に設定し、押輪23の拡径穴60の拡径角度をこれに合わせて設定している。 As a result, the resin pipe flexible unit 21 is rotatably and flexibly connected to the flexible joint 15, so that when an earthquake occurs, the water pipe connected to the resin pipe part 32 of the resin pipe flexible unit 21 is When it is displaced due to fluctuations, it can be rotated and flexible in accordance with the displacement. In this embodiment, the flexibility range of the resin tube flexible unit 21 is set to about 15 degrees, and the diameter expansion angle of the diameter expansion hole 60 of the press ring 23 is set accordingly.

また、接続工事の際に、樹脂管部32に軸心とこれに接続する水道管(ポリエチレン管)の軸心が一致しない場合には、樹脂管可撓ユニット21を可撓させることによって、樹脂管部32の軸心と水道管の軸心とを一致させ、施工不良(融着不良)を防止することができる。 In addition, during connection work, if the axis of the resin pipe section 32 and the axis of the water pipe (polyethylene pipe) connected thereto do not match, the resin pipe flexible unit 21 can be flexed. By aligning the axial center of the pipe portion 32 with the axial center of the water pipe, poor construction (poor fusion) can be prevented.

圧入スリーブ30が鍔部29を有し、この鍔部29の外周面側にはアール面28が形成されていることにより、鍔部29のアール面28は可撓接合部15の球面部46に当接し、可撓接合部15の球面部46が露出することにより生じる凹段差部(ポケット)78の範囲を大幅に低減させている。 The press-fit sleeve 30 has a flange 29 and a rounded surface 28 is formed on the outer peripheral surface of the flange 29, so that the rounded surface 28 of the flange 29 contacts the spherical surface 46 of the flexible joint 15. The range of the recessed step portion (pocket) 78 that occurs when the spherical portion 46 of the flexible joint portion 15 is exposed due to the contact is greatly reduced.

これにより、凹段差部78により生じる乱流が原因となる圧力損失の発生、凹段差部78の内部に付着する配水管内部の鉄錆の流入による赤水発生、凹段差部78の内部に溜まる異物が原因となる噛み込み発生を抑制することができる。 As a result, pressure loss occurs due to turbulent flow caused by the recessed step 78, red water is generated due to the inflow of iron rust inside the water pipe adhering to the inside of the recessed step 78, and foreign matter accumulates inside the recessed step 78. It is possible to suppress the occurrence of jamming caused by

流体圧が加わると、樹脂管可撓ユニット21は押輪23側に押され、押輪23の当接アール面58でリング体36のボール面33を可撓状態で支持する。 When fluid pressure is applied, the resin tube flexible unit 21 is pushed toward the push ring 23, and the contact radius surface 58 of the push ring 23 supports the ball surface 33 of the ring body 36 in a flexible state.

また、流体圧が加わることにより、可撓接合部15の段部48に配設したシール部材47も押輪23側に移動し、押輪23に密着した状態で可撓接合部15の開口端部19の内周側とリング体36との間を可撓状態でシールする。 Furthermore, due to the application of fluid pressure, the sealing member 47 disposed on the stepped portion 48 of the flexible joint 15 also moves toward the press ring 23 and remains in close contact with the press ring 23 at the open end 19 of the flexible joint 15. A flexible seal is formed between the inner peripheral side of the ring body 36 and the ring body 36.

次に、図9により、樹脂管可撓ユニット21の可撓状態について説明する。図9は、樹脂管可撓ユニット21が可撓接合部15に対して最大可撓した状態を示している。このときの可撓接合部15の軸心73と樹脂管可撓ユニット21の軸心74とが成す角度θは15度であり、樹脂管可撓ユニット21の樹脂管部32の外周面が押輪23の拡径穴60の内周面に当接し、それ以上の可撓が規制されている。 Next, the flexible state of the resin tube flexible unit 21 will be explained with reference to FIG. FIG. 9 shows a state in which the resin pipe flexible unit 21 is maximally flexible with respect to the flexible joint 15. As shown in FIG. At this time, the angle θ formed by the axis 73 of the flexible joint 15 and the axis 74 of the resin tube flexible unit 21 is 15 degrees, and the outer peripheral surface of the resin tube portion 32 of the resin tube flexible unit 21 is 23, and further flexibility is restricted.

このとき、押輪23の拡径穴60の内周面と樹脂管部32の外周面とが接触する範囲は、樹脂管部32の内周側に圧入固定した圧入スリーブ30の外周面26が存在する範囲内であるので、樹脂管可撓ユニット21の可撓により樹脂管部32が押輪23の拡径穴60の内周面から受ける力は圧入スリーブ30により支持され、樹脂管部32の変形を防ぐことができる。 At this time, the range where the inner circumferential surface of the enlarged diameter hole 60 of the press ring 23 and the outer circumferential surface of the resin pipe part 32 come into contact is the area where the outer circumferential surface 26 of the press-fit sleeve 30 press-fitted and fixed to the inner circumferential side of the resin pipe part 32 exists. Therefore, the force that the resin tube section 32 receives from the inner peripheral surface of the enlarged diameter hole 60 of the press ring 23 due to the flexibility of the resin tube flexible unit 21 is supported by the press-fit sleeve 30, and the force that the resin tube section 32 receives from the inner circumferential surface of the enlarged diameter hole 60 of the press ring 23 is supported by the press-fit sleeve 30, thereby preventing the deformation of the resin tube section 32. can be prevented.

また、圧入スリーブ30の鍔部29の内周面側にテーパー面38を形成しているので、樹脂管可撓ユニット21が可撓した状態における接合部18のボデー流路39に対する急激な流路面積の変化を防ぎ、可撓時の圧力損失を抑制し、流路を確保することができる。 In addition, since the tapered surface 38 is formed on the inner peripheral surface side of the flange 29 of the press-fit sleeve 30, the flow path of the joint portion 18 relative to the body flow path 39 is sharply formed when the resin tube flexible unit 21 is flexible. It is possible to prevent changes in area, suppress pressure loss during flexibility, and secure a flow path.

樹脂管可撓ユニット21が可撓した影響は防塵カバー61にも及ぶが、前述したように、防塵カバー61の底部63には奥行幅を変えて蛇腹部68を形成して防塵カバー61に十分な伸縮性を与えているため、防塵カバー61は、可撓時の樹脂管可撓ユニット21の動きに追随して柔軟に変形することができる。 The influence of the flexibility of the resin tube flexible unit 21 also extends to the dustproof cover 61, but as described above, the bottom part 63 of the dustproof cover 61 is formed with a bellows part 68 with a different depth, so that the dustproof cover 61 is sufficiently Since the dustproof cover 61 is given elasticity, it can be flexibly deformed following the movement of the resin tube flexible unit 21 when it is flexible.

防塵カバー61を可撓接合部15に取り付ける際に、可撓接合部15の突起部53を挿嵌する防塵カバー61の溝部65は、側面64の厚みが最も増加した部位に設けているために変形しにくく十分な保持力を有しており、防塵カバー61が変形してもその影響を受けることなく溝部65内に突起部53を保持し続けることができる。 When attaching the dustproof cover 61 to the flexible joint part 15, the groove part 65 of the dustproof cover 61 into which the projection part 53 of the flexible joint part 15 is inserted is provided at the part where the thickness of the side surface 64 increases the most. It is difficult to deform and has sufficient holding power, so that even if the dustproof cover 61 is deformed, the protrusion 53 can continue to be held within the groove 65 without being affected by the deformation.

これに加え、防塵カバー61には、樹脂管可撓ユニット21の樹脂管部32の外径よりも小径に形成した挿通孔66の内周側に先端が尖った形状の突起部(リップ部)67を設けている。この突起部67は、防塵カバー61へ樹脂管可撓ユニット21の樹脂管部32を挿入し易くするだけでなく、樹脂管部32の挿入により突起部67が拡径されることにより生じる復元力によって樹脂管部32の外周面37を強く把持してダストシール効果とブレーキ機能を発揮するので、樹脂管可撓ユニット21が可撓して防塵カバー61が変形しても突起部67の把持位置は移動することがなく、ダストシール機能を損なわずにカバー状態を維持することができる。 In addition, the dustproof cover 61 has a protrusion (lip portion) with a pointed tip on the inner circumferential side of the insertion hole 66 formed to have a smaller diameter than the outer diameter of the resin tube portion 32 of the resin tube flexible unit 21. 67 are provided. This protrusion 67 not only makes it easier to insert the resin tube section 32 of the resin tube flexible unit 21 into the dustproof cover 61, but also provides a restoring force generated by the diameter of the protrusion 67 being expanded by inserting the resin tube section 32. Since the outer circumferential surface 37 of the resin pipe portion 32 is strongly gripped to exert a dust sealing effect and a braking function, even if the resin pipe flexible unit 21 is flexible and the dustproof cover 61 is deformed, the gripping position of the protrusion 67 remains unchanged. It does not move and can maintain the cover state without impairing the dust seal function.

次いで、前述した防塵カバーの他例を説明する。図10においては、防塵カバーの他例を示し、図11(a)、図12は、図10の防塵カバーの取り付け状態を示している。なお、以降において、それ以前に説明した部分と同一部分は同一符号によって表し、その説明を省略する。 Next, another example of the above-mentioned dustproof cover will be explained. FIG. 10 shows another example of the dustproof cover, and FIGS. 11(a) and 12 show the state in which the dustproof cover of FIG. 10 is attached. In addition, hereinafter, parts that are the same as those described before are represented by the same reference numerals, and the description thereof will be omitted.

図10の防塵カバー80は、円筒部81、環状凹凸部82、延設筒部83、環状締付部84を備え、前記防塵カバー61と同様に、可撓接合部15と開口端部19との間に取り付けられる。
円筒部81は、開口端部19に取り付け可能な口径によって略円筒状に形成され、この円筒部81の先端に環状凹凸部82が設けられる。
The dustproof cover 80 in FIG. 10 includes a cylindrical part 81, an annular uneven part 82, an extended cylindrical part 83, and an annular tightening part 84, and, like the dustproof cover 61, the flexible joint part 15 and the open end part 19. installed between.
The cylindrical portion 81 is formed into a substantially cylindrical shape with a diameter that can be attached to the open end portion 19, and an annular uneven portion 82 is provided at the tip of the cylindrical portion 81.

環状凹凸部82は、円筒部81から求心方向に沿って底部63の内側に、幅Wにより深さ方向に均等の寸法で蛇腹状に設けられ、この防塵カバー80では、幅Wが小さく設けられることで、環状凹凸部82の各凹凸部位が浅く形成されている。 The annular uneven portion 82 is provided inside the bottom portion 63 along the centripetal direction from the cylindrical portion 81 in a bellows shape with a width W that is uniform in the depth direction, and in this dustproof cover 80, the width W is provided small. As a result, each uneven portion of the annular uneven portion 82 is formed shallowly.

延設筒部83は、環状凹凸部82の内周端82aより図14に示すように樹脂管部32の外周面まで延設させて延設部82bを設け、さらに、延設部82bの内端より樹脂管部32の軸心74方向に長さLにより延設されるように形成される。内周端82aは環状凹凸部82の底部63側に位置し、この内周端82aから延設筒部83を設けていることで、延設筒部83による樹脂管部32外周への接触部位が長くなって樹脂管部32への接触面積が大きくなる。 The extending cylindrical portion 83 extends from the inner circumferential end 82a of the annular uneven portion 82 to the outer circumferential surface of the resin pipe portion 32 as shown in FIG. It is formed to extend a length L from the end in the direction of the axis 74 of the resin pipe portion 32. The inner circumferential end 82a is located on the bottom 63 side of the annular uneven portion 82, and by providing the extending cylindrical portion 83 from the inner circumferential end 82a, the contact portion of the extending cylindrical portion 83 with the outer periphery of the resin pipe portion 32 is reduced. becomes longer and the contact area with the resin pipe portion 32 becomes larger.

図11(b)において、環状締付部84は、延設筒部83の先端側に設けられ、環状凹凸部82で構成される樹脂管部32との屈曲部位から延設筒部83を介して離れた位置に配置される。この環状締付部84は、延設筒部83の外周(外径)側に突出した状態で、この延設筒部83の軸心74方向の長さの略半分の長さで厚さTによって形成される。環状締付部84の厚さTや長さは、それぞれ適宜の大きさに設定可能になっている。
上記の構成により、防塵カバー80は、挿し口(軸芯74)方向において前述した防塵カバー61よりも短尺状に設けられる。
In FIG. 11(b), the annular tightening portion 84 is provided on the distal end side of the extended cylindrical portion 83, and extends from the bent portion of the resin pipe portion 32 constituted by the annular uneven portion 82 through the extended cylindrical portion 83. and placed in a remote location. This annular tightening part 84 is in a state of protruding toward the outer periphery (outer diameter) side of the extended cylindrical part 83, and has a thickness of approximately half the length of the extended cylindrical part 83 in the direction of the axis 74. formed by The thickness T and length of the annular tightening portion 84 can be set to appropriate sizes.
With the above configuration, the dustproof cover 80 is provided in a shorter length than the dustproof cover 61 described above in the direction of the insertion opening (axis 74).

ここで、このような構造の防塵カバーを取り付ける場合には、継手部位とバルブとを地中に埋設した際に、環状凹凸部の外側(砂や土との接触側)の凹状部位に砂や土が押し込まれ、この状態で突き固められて固定された状態になる可能性がある。この場合、環状凹凸部の蛇腹としての伸縮可撓性が極端に失われ、この状態で外力等により樹脂管部が屈曲する際には、防塵カバーの追従が阻害され、防塵カバーの樹脂管部との接触側に隙間が発生し、この隙間から砂や土が次々に浸入するおそれがある。その結果、継手部分にも砂や土が入り込んで樹脂管可撓ユニットの可撓性が低下すると共に、元の配管状態に復帰しにくくなるという問題も生じる。これにより、著しく機能性が失われて商品価値も低下する。 When installing a dustproof cover with such a structure, when the joint part and the valve are buried in the ground, sand or dirt may be deposited on the concave part on the outside of the annular concavo-convex part (the side that comes in contact with sand or soil). Soil is pushed in and in this state it can become compacted and fixed. In this case, the elasticity of the annular uneven part as a bellows is extremely lost, and when the resin pipe part bends due to external force etc. in this state, the following of the dust-proof cover is inhibited, and the resin pipe part of the dust-proof cover A gap will be created on the contact side, and there is a risk that sand and soil will infiltrate one after another through this gap. As a result, sand and soil enter the joint portion, reducing the flexibility of the resin pipe flexible unit and causing difficulty in returning to the original piping state. This results in a significant loss of functionality and a decrease in commercial value.

これに対して、本例の防塵カバー80では、図11(a)、図11(b)において、環状凹凸部82の底部63側に位置する内周端82aより延設部82bを延設し、さらに延設筒部83を樹脂管部32の軸心方向に沿って延設し、この延設筒部32の先端部に環状締付部84を設けている。このため、例えば外力等により樹脂管部32がX方向に屈曲するときに、砂や土が突き固められた環状凹凸部82の影響を受けにくくなり、この環状凹凸部82から離れた位置で環状締付部84が樹脂管部32を締付け、内周端82a付近の環状凹凸部82と延設筒部83が樹脂管部32の可撓に追従するように伸長、屈曲することで、環状締付部84と樹脂管部32との隙間の発生を確実に防ぐことができる。これにより、図12における樹脂管可撓ユニット21の可撓状態であっても、砂や土の浸入を防ぎ、仮に、樹脂管接触部(口元部)の近傍が突き固めされていたとしても、その影響をほとんど受けることがなく、特に高い追従性が要求される樹脂管部32と防塵カバー80との接触部位の防塵性を確保できる。 On the other hand, in the dustproof cover 80 of this example, as shown in FIGS. 11(a) and 11(b), the extending portion 82b is extended from the inner peripheral end 82a located on the bottom 63 side of the annular uneven portion 82. Further, an extending cylindrical portion 83 is provided to extend along the axial direction of the resin tube portion 32, and an annular tightening portion 84 is provided at the distal end portion of the extending cylindrical portion 32. Therefore, when the resin pipe part 32 is bent in the X direction due to external force, for example, it is less affected by the annular uneven part 82 where sand or soil is compacted, and the annular shape is formed at a position away from the annular uneven part 82. The tightening part 84 tightens the resin pipe part 32, and the annular uneven part 82 near the inner peripheral end 82a and the extension cylinder part 83 extend and bend to follow the flexibility of the resin pipe part 32, thereby tightening the annular part 32. It is possible to reliably prevent the occurrence of a gap between the attaching portion 84 and the resin pipe portion 32. This prevents sand and soil from entering even if the resin pipe flexible unit 21 in FIG. It is hardly affected by this, and dustproofness can be ensured at the contact area between the resin pipe portion 32 and the dustproof cover 80, which requires particularly high followability.

しかも、環状凹凸部82の幅Wを小さくし、凹凸部位の深さを浅く設けていることにより、この凹状部位への砂や土の押し込み量を少なくして環状凹凸部82の屈曲性の低下を抑えている。
延設筒部83を長さLにより長尺状に形成し、この延設筒部83と樹脂管部32との接触面積を大きくしているので、延設筒部83による樹脂管部32の保持性(一体性)を高めることが可能となる。環状締付部84を延設筒部83の軸心74方向の略半分の長さに設けていることにより、この環状締付部84による締付け力を高めつつ、それ以外の部分の長さによって延設筒部83全体の可撓時の自由度を高めて追従性を向上している。
Furthermore, by reducing the width W of the annular uneven portion 82 and making the depth of the uneven portion shallow, the amount of sand or soil pushed into the recessed portion is reduced, thereby reducing the flexibility of the annular uneven portion 82. is suppressed.
Since the extended cylindrical portion 83 is formed into an elongated shape with a length L, and the contact area between the extended cylindrical portion 83 and the resin pipe portion 32 is increased, the extension cylindrical portion 83 can reduce the contact area of the resin pipe portion 32. It becomes possible to improve retention (integrity). By providing the annular tightening portion 84 at approximately half the length of the extended cylindrical portion 83 in the direction of the axis 74, the tightening force by the annular tightening portion 84 is increased, and the length of the other portions increases. The degree of freedom of the entire extended cylindrical portion 83 during flexibility is increased to improve followability.

この例では、防塵カバー80を短尺状に設けているため、この防塵カバー80の樹脂管部32の軸心74方向への取り付け長さを短くできる。これにより、例えば、樹脂管部32をEF接合等により図示しない外部の樹脂製継手と接合する際に、防塵カバー80が作業の邪魔になることがなく、作業性が高くなる。 In this example, since the dustproof cover 80 is provided in a short shape, the attachment length of the dustproof cover 80 in the direction of the axis 74 of the resin pipe portion 32 can be shortened. Thereby, for example, when the resin pipe portion 32 is joined to an external resin joint (not shown) by EF joining or the like, the dustproof cover 80 does not get in the way of the work, increasing work efficiency.

以上説明したように、本発明の樹脂管可撓ユニットを用いた継手構造は、樹脂管可撓ユニットを収容する拡径部の内周面が露出することにより生じる凹段差部の範囲を低減させ、継手構造内に略ストレートな流路を得ることができる。このため、弁箱底部がフラットなストレート構造であるために圧力損失がなく、また、異物が底部に堆積することがないというソフトシール仕切弁の特徴を損なうことなくソフトシール仕切弁を可撓化するために最適の継手構造である。 As explained above, the joint structure using the resin tube flexible unit of the present invention reduces the range of the recessed stepped portion that is caused by exposing the inner peripheral surface of the enlarged diameter portion that accommodates the resin tube flexible unit. , a substantially straight flow path can be obtained within the joint structure. Because of this, the bottom of the valve body has a flat, straight structure, so there is no pressure loss, and the soft seal gate valve can be made more flexible without compromising its characteristics of preventing foreign matter from accumulating on the bottom. This is the optimal joint structure for this purpose.

また、以上の説明は、両側接続部にポリエチレン管を接続したポリエチレン挿し口を備えるソフトシール仕切弁に可撓性を持たせることを前提に行ったが、これに限定されるものではなく、例えば、図13に示すように片側がフランジ構造の仕切弁の一方に可撓性を持たせるためにも使用するとことができ、また、仕切弁の他にも通常の継手に可撓性を持たせるためにも使用できることは勿論である。 Furthermore, although the above explanation has been made on the assumption that the soft seal gate valve is provided with flexibility and has a polyethylene insertion port with polyethylene pipes connected to both side connection parts, it is not limited to this, and for example, As shown in Fig. 13, it can also be used to give flexibility to one side of a gate valve with a flange structure, and it can also be used to give flexibility to ordinary joints other than gate valves. Of course, it can also be used for other purposes.

次いで、前述した継手構造の実施例として、防塵カバーを取り付けた継手部位を埋設したときの実験例を説明する。図14は、前述した継手部位に防塵カバー80を取り付けた状態を示し、図15は、図14の継手部位の埋設状態を示している。 Next, as an example of the above-mentioned joint structure, an experimental example will be described in which a joint portion to which a dustproof cover is attached is buried. FIG. 14 shows a state in which the dustproof cover 80 is attached to the joint part described above, and FIG. 15 shows a state in which the joint part in FIG. 14 is buried.

この実施例で接続される樹脂管部32は、φ50mmのポリエチレン管からなり、継手部位は防塵カバー80を取り付けた状態で埋設用ボックス内に収納して埋設した。
継手部位の埋設前には、環状締付部84の端面位置の樹脂管部32外周にペンでケガキ線85を基準線として引いた。
The resin pipe portion 32 to be connected in this example was made of a polyethylene pipe with a diameter of 50 mm, and the joint portion was housed and buried in a burying box with a dustproof cover 80 attached.
Before embedding the joint portion, a marking line 85 was drawn with a pen on the outer periphery of the resin pipe portion 32 at the end face position of the annular tightening portion 84 as a reference line.

図14(a)の埋設前の状態では、軸芯74方向において内周端82aが底部63側に位置し、このときの防塵カバー80の全長S1は80mmとなった。この状態から、仮に継手部位(及びバルブ)を埋設して砂や土を突き固め、延設筒部83付近がバルブ(接合部18)方向に位置ズレしたとしても、図14(b)において、リング体36と押輪23、樹脂管部32との間に設けられる環状の空間Gには、延設筒部83や環状締付部84が入り込むおそれがない。このことから、埋設後にも防塵カバー80全体が可撓するための空間Gを確保し、樹脂管可撓ユニット21の所定の可撓角度θを確保できるようになっている。 In the state shown in FIG. 14A before burying, the inner peripheral end 82a is located on the bottom 63 side in the direction of the axis 74, and the total length S1 of the dustproof cover 80 at this time is 80 mm. In this state, even if the joint part (and the valve) is buried and the sand or soil is tamped down, and the vicinity of the extension cylinder part 83 shifts in the direction of the valve (joint part 18), in FIG. 14(b), There is no possibility that the extending cylinder part 83 or the annular tightening part 84 will enter the annular space G provided between the ring body 36, the press ring 23, and the resin pipe part 32. Therefore, even after embedding, a space G for the entire dustproof cover 80 to be flexible can be secured, and a predetermined flexibility angle θ of the resin pipe flexible unit 21 can be secured.

続いて、ボックス内に山砂Saを敷いて突き固め、継手部位の埋設をおこなった。図15(a)は、図14(a)の防塵カバーの取り付けた継手部位を埋設して突き固めた状態を示している。
この状態で継手部位外周側の山砂Saの一部を掘り起し、防塵カバー80の全長を測定したところ、その全長S2は70mmとなった。このとき、環状締付部84側が、二点鎖線で示した初期位置からバルブ側(矢印側)に距離ΔS=10mmでズレたことをケガキ線85の位置から確認した。これらのことから、埋設時に防塵カバー80が山砂Saで突き固められ、その口元部位がバルブ側に10mm程度押し込まれたことを確認した。
Next, mountain sand Sa was spread and tamped inside the box, and the joint portion was buried. FIG. 15(a) shows a state in which the joint portion to which the dustproof cover of FIG. 14(a) is attached is buried and tamped.
In this state, a part of the mountain sand Sa on the outer peripheral side of the joint part was dug up and the total length of the dustproof cover 80 was measured, and the total length S2 was 70 mm. At this time, it was confirmed from the position of the marking line 85 that the annular tightening part 84 side was shifted by a distance ΔS=10 mm from the initial position shown by the two-dot chain line toward the valve side (arrow side). From these results, it was confirmed that the dustproof cover 80 was compacted with mountain sand Sa during burial, and its opening was pushed approximately 10 mm toward the valve side.

次に、掘り起こし部分を埋めて突き固め、樹脂管可撓ユニット21を可撓角度θ=15度で可撓させた後に、再度一部を掘り起こして防塵カバー80の状態を確認した。
この場合、図15(b)に示すように、可撓により樹脂管部32の元の位置にはスペースRができるものの、環状凹凸部82は、凹状部位への突き固めの影響で蛇腹としての機能が損なわれて動きにくくなる。しかし、環状締付部84は、埋設直後の締付け位置からほぼズレることはなく、拡径方向に変形したことも確認されなかった。
Next, the excavated portion was buried and tamped, and after the resin tube flexible unit 21 was made flexible at a bending angle θ=15 degrees, a portion was dug up again and the state of the dustproof cover 80 was checked.
In this case, as shown in FIG. 15(b), although a space R is created in the original position of the resin pipe portion 32 due to the flexibility, the annular uneven portion 82 does not function as a bellows due to the influence of tamping into the concave portion. Function is impaired and movement becomes difficult. However, the annular tightening portion 84 did not substantially deviate from the tightening position immediately after being buried, and no deformation in the diametrical direction was observed.

これは、図15(a)の軸芯74よりも上部側では、内周端82a付近と環状凹凸部82と延設筒部83が樹脂管部32の可撓に追従して伸長するように変形し、一方、軸芯74よりも下部側では延設筒部83が屈曲するように変形することで、環状凹凸部82の突き固めの影響を受けにくくなっているためと考えられる。この防塵カバー80の機能性により、地震等により樹脂管可撓ユニット21が可撓したとしても、樹脂管部32との隙間の発生を抑え、砂や土の浸入を確実に防止することが可能となる。 This is because, on the upper side of the axis 74 in FIG. This is thought to be due to the fact that, on the other hand, the extension tube portion 83 is deformed so as to be bent on the lower side of the axis 74, making it less susceptible to the effects of compaction of the annular uneven portion 82. Due to the functionality of this dustproof cover 80, even if the resin pipe flexible unit 21 is bent due to an earthquake, etc., it is possible to suppress the generation of a gap with the resin pipe part 32 and reliably prevent the infiltration of sand and soil. becomes.

11 可撓式ソフトシール仕切弁
12 バルブ本体
13 弁箱
15 可撓接合部
18 接合部
19 開口端部
21 樹脂管可撓ユニット
23 押輪
27 係止部
28 アール面
29 鍔部
30 圧入スリーブ
32 樹脂管部
33 ボール面
35 抜け止め部
36 リング体
42 シール部材
46 球面部
58 当接アール面
61、80 防塵カバー
74 軸心
81 円筒部
82 環状凹凸部
82a 内周端
83 延設筒部
84 環状締付部
11 Flexible soft seal gate valve 12 Valve body 13 Valve box 15 Flexible joint 18 Joint 19 Open end 21 Flexible resin pipe unit 23 Push ring 27 Locking part 28 Round surface 29 Flange 30 Press-fit sleeve 32 Resin pipe Part 33 Ball surface 35 Retaining part 36 Ring body 42 Seal member 46 Spherical part 58 Contact radius surface 61, 80 Dust cover 74 Axial center 81 Cylindrical part 82 Annular uneven part 82a Inner peripheral end 83 Extended cylindrical part 84 Annular tightening Department

Claims (3)

継手本体の接合部を拡径した状態の可撓接合部を設け、この可撓接合部の内周球面部に樹脂管部を接合した樹脂管可撓ユニットを可撓自在に挿入し、前記可撓接合部の外周面の開口端部と前記樹脂管部との間に防塵カバーを取付けた継手構造であって、前記防塵カバーの円筒部の底部内側から求心方向に沿って蛇腹状の凹凸部位の深さを浅く形成した環状凹凸部が設けられ、この環状凹凸部の内周端より前記樹脂管部の外周面まで延設部を延ばし、この延設部の内端を前記樹脂管部の外端軸心方向に沿った状態で長尺の延設筒部を形成し、この延設筒部の内周面に形成した挿通孔を前記樹脂管部の外周面に周面接触させると共に、前記延設筒部の先端外周面に前記樹脂管部の外周を締付けるための環状締付部を設けたことを特徴とする防塵カバーを有する継手構造。 A flexible joint with an enlarged diameter is provided at the joint of the joint body, and a resin pipe flexible unit with a resin pipe joined to the inner spherical surface of the flexible joint is flexibly inserted, and the The joint structure has a dustproof cover installed between the open end of the outer circumferential surface of the flexible joint and the resin pipe part, and the dustproof cover has a bellows-shaped uneven portion extending from the inside of the bottom of the cylindrical part in the centripetal direction. An annular uneven part is formed to have a shallow depth, and an extending part is extended from the inner circumferential end of the annular uneven part to the outer circumferential surface of the resin pipe part, and the inner end of this extending part is connected to the outer circumferential surface of the resin pipe part. An elongated extending cylindrical portion is formed along the outer end axial direction, and an insertion hole formed in the inner circumferential surface of the extending cylindrical portion is brought into peripheral surface contact with the outer circumferential surface of the resin pipe portion. A joint structure having a dustproof cover, characterized in that an annular tightening portion for tightening the outer periphery of the resin pipe portion is provided on the outer circumferential surface of the distal end of the extending cylindrical portion . 前記環状締付部の内周先端に突起部を設け、この突起部で前記樹脂管部の外周を締付状態で把持した請求項1に記載の防塵カバーを有する継手構造。 2. The joint structure having a dustproof cover according to claim 1, wherein a protrusion is provided at the tip of the inner periphery of the annular tightening part, and the protrusion grips the outer periphery of the resin pipe part in a tightened state. 請求項1または請求項2に記載の継手構造をソフトシール仕切弁のバルブ本体に適用したことを特徴とする可撓式ソフトシール弁。 A flexible soft seal valve, characterized in that the joint structure according to claim 1 or 2 is applied to a valve body of a soft seal gate valve .
JP2022106018A 2017-10-23 2022-06-30 Joint structure and valve with dustproof cover and flexible soft seal gate valve Active JP7350943B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2017204792 2017-10-23
JP2017204792 2017-10-23
JP2018067677A JP7099852B2 (en) 2017-10-23 2018-03-30 Joint structure and valve as well as flexible soft seal sluice valve

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2018067677A Division JP7099852B2 (en) 2017-10-23 2018-03-30 Joint structure and valve as well as flexible soft seal sluice valve

Publications (2)

Publication Number Publication Date
JP2022128498A JP2022128498A (en) 2022-09-01
JP7350943B2 true JP7350943B2 (en) 2023-09-26

Family

ID=66627556

Family Applications (2)

Application Number Title Priority Date Filing Date
JP2018067677A Active JP7099852B2 (en) 2017-10-23 2018-03-30 Joint structure and valve as well as flexible soft seal sluice valve
JP2022106018A Active JP7350943B2 (en) 2017-10-23 2022-06-30 Joint structure and valve with dustproof cover and flexible soft seal gate valve

Family Applications Before (1)

Application Number Title Priority Date Filing Date
JP2018067677A Active JP7099852B2 (en) 2017-10-23 2018-03-30 Joint structure and valve as well as flexible soft seal sluice valve

Country Status (1)

Country Link
JP (2) JP7099852B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112728178B (en) * 2020-12-29 2022-06-10 河北鑫星燃气设备股份有限公司 Gas pressure regulator with good air tightness

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001124261A (en) 1999-10-25 2001-05-11 Shimizu Gokin Seisakusho:Kk Connector for vinyl chloride resin pipe
JP2004225837A (en) 2003-01-24 2004-08-12 Waterworks Technology Development Organization Co Ltd Piping joint method and flexible pipe joint used therefor
JP2011099515A (en) 2009-11-06 2011-05-19 Kubota Corp Joint structure of valve with pipe, and valve
JP2015143524A (en) 2013-12-25 2015-08-06 コスモ工機株式会社 Pipe joint

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725289U (en) * 1980-07-21 1982-02-09
JPH08285109A (en) * 1995-04-12 1996-11-01 Kubota Corp Earthquake-resistant valve
JPH1073175A (en) * 1996-08-28 1998-03-17 Shimizu Gokin Seisakusho:Kk Stainless steel valve for corrosion/earthquake resistant piping
JPH10311463A (en) * 1997-05-12 1998-11-24 Fuji Koatsu Furekishiburu Hoosu Kk Connecting device of pipe and joint
JPH11304065A (en) * 1998-04-16 1999-11-05 Higashio Mec Kk Tube fitting
US6250690B1 (en) * 1999-08-26 2001-06-26 Waterworks Technology Development Organization Co., Ltd. Expansion flexible tube joint and assembling method thereof
JP5748632B2 (en) 2011-10-07 2015-07-15 株式会社水研 Flexible ball joint unit, assembling method of the unit, and piping method using the unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001124261A (en) 1999-10-25 2001-05-11 Shimizu Gokin Seisakusho:Kk Connector for vinyl chloride resin pipe
JP2004225837A (en) 2003-01-24 2004-08-12 Waterworks Technology Development Organization Co Ltd Piping joint method and flexible pipe joint used therefor
JP2011099515A (en) 2009-11-06 2011-05-19 Kubota Corp Joint structure of valve with pipe, and valve
JP2015143524A (en) 2013-12-25 2015-08-06 コスモ工機株式会社 Pipe joint

Also Published As

Publication number Publication date
JP2022128498A (en) 2022-09-01
JP7099852B2 (en) 2022-07-12
JP2019078402A (en) 2019-05-23

Similar Documents

Publication Publication Date Title
JP6948372B2 (en) Pipe fitting
JP3948818B2 (en) Fixing structure for pipe fittings
JP7350943B2 (en) Joint structure and valve with dustproof cover and flexible soft seal gate valve
JP4382226B2 (en) Reinforced joint for pipe connection
JP6242680B2 (en) Pipe fitting
GB1574298A (en) Pipe connectors
JP2573496B2 (en) Anticorrosion pipe fittings
JP4845536B2 (en) Anti-corrosion structure of pipe end face
JP3139908B2 (en) Corrosion protection cap on pipe end
JP3436864B2 (en) Captive fittings
JP3764323B2 (en) Plug-in type propulsion pipe
JPH1030756A (en) Manhole joint structure
JP3290549B2 (en) Connection structure and method of pipe to manhole
US20070200341A1 (en) Sewer tap with watertight lip
JP2007255684A (en) Pipe joint
JPH0914570A (en) Earthquake resistance reinforcing device for life line pipe conduit
JP4593409B2 (en) Expandable flexible joint structure
JP3083418B2 (en) Pipe fittings for water pipe bridges
JP4462741B2 (en) Pipe joint
JP3121573B2 (en) Corrosion protection structure at pipe end in pipe joint and its corrosion protection core
CN214093438U (en) Quick-connection drain pipe
JP3197477B2 (en) Flexible structure and flexible telescopic structure of conduit
JP3151200B1 (en) Joint structure of bayonet joint and pipe for bayonet joint
JP4810267B2 (en) Pipe fitting
JPH0620948Y2 (en) Lining steel pipe

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20220630

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20230525

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20230530

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20230731

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20230822

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20230913

R150 Certificate of patent or registration of utility model

Ref document number: 7350943

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150