JP3904698B2

JP3904698B2 - Tube fixing device

Info

Publication number: JP3904698B2
Application number: JP31146297A
Authority: JP
Inventors: 強道高村
Original assignee: Cosmo Koki Co Ltd
Current assignee: Cosmo Koki Co Ltd
Priority date: 1997-10-27
Filing date: 1997-10-27
Publication date: 2007-04-11
Anticipated expiration: 2017-10-27
Also published as: JPH11132373A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば流体管同士の継手部に設けられて管の離脱を防止する際や、割Ｔ字管等を流体管に強固に装着する際等に用いられる管の固定装置に関する。
【０００２】
【従来の技術】
例えば水道管同士を接続したり、水道管に分岐管を接続するための割Ｔ字管を装着したりする際には、地震等による地震の振動等により、管同士が抜け外れたり、割Ｔ字管に位置ずれが発生することのないように、締付具を備える特殊押輪等の固定具が用いられる。
【０００３】
図９は、固定具の一種である従来の離脱防止装置が装着された管同士の継手部を示している。
【０００４】
同図において、一方の流体管の受口部ａ内には、他方の流体管の端部の挿口部ｂが挿入され、互いの嵌合部間の隙間は、受口部ａの内周面の拡径凹部ｃ内に挿入されたパッキンｄにより水密性が保持されている。
【０００５】
挿口部ｂの外周面には、離脱防止装置ｅが装着されている。離脱防止装置ｅは、環状のパッキン押圧部ｆを有する押輪ｇと、押輪ｇの内周面の環状溝内に収容された、内周面に尖鋭な刃部を有する円弧状の複数の締付片ｈと、この締付片ｈを押圧する、管と直交する方向を向く複数の押しボルトｉと、押輪ｇの外周面に連設された複数のフランジ部ｊと受口部ａのフランジ部ｋとを締結するＴ頭ボルトｌとナットｍとにより構成されている。
【０００６】
上記離脱防止装置ｅにおいて、各締付片ｈの両側面は環状溝により拘束され、かつ外周面は押しボルトｉと当接しているので、挿口部ｂが受口部ａより離脱しようとすると、各締付片ｈの刃部が流体管に食い込み、離脱防止が図られる。
【０００７】
【発明が解決しようとする課題】
上述した従来の固定具である離脱防止装置ｅにおいては、双方の流体管を離脱防止を図りながら固定するに際し、締付方向及び構造の異なる２種類の固定手段、すなわち、複数の押しボルトｉとＴ頭ボルトｌ及びナットｍを用いているため、それらの締付作業に手間がかかり、特に大径の流体管では、押しボルト等の個数も増加するため、作業能率が低下する。
【０００８】
また、押輪ｇに、押しボルトｉ取付用のボス部や締付片ｈ挿入用の環状溝等を形成する必要があるため、鋳造品の場合、鋳型の構造が複雑かつ大型化し、コストの上昇を招く。
【０００９】
さらに、各締付片ｈを、それぞれ個々の押しボルトｉにより締付けているため、それらを均等に締付けるには熟練を要する。
【００１０】
本発明は、上記問題点を解決するためになされたもので、管の固定と締付具の押圧とを１つの部材により行うことにより、ボルト等の数を最小限とするとともに、構造を簡素化し、かつ締付片を均一に押圧しうるようにした管の固定装置を提供することを目的としている。
【００１１】
【課題を解決するための手段】
上記目的を達成するために、本発明の固定装置は、流体管に外嵌されたＴ字管等の側端面、又は流体管同士の継手部等における受口部の開口端面に当接しうる側面を有し、流体管の外周面に嵌合された、外周面がＴ字管又は受口部側に向かって漸次拡径するテーパ面をなす締付具と、この締付具の側方の流体管に管軸方向に移動可能として外嵌され、内周面が締付具の外周面に密接可能なテーパ面をなす環状押圧部と前記Ｔ字管又は受口部の端部に締付手段をもって締結可能なフランジを有する押輪と、を備え、
前記締付具は円弧状の複数の締付片と、該各締付片同士を連結する接続具とからなり、前記各締付片にはその締付片の円周方向の対向端面とそれに連なる前記側面に一方の面が開口するスリット状の連結溝が形成され、該連結溝の奥部に連結溝の溝幅より拡幅された拡開段部が設けられていると共に、前記接続具は基部の上下両端部に、弾性変形可能な薄肉の可撓片が側方を向いて互いに平行に連設された、正面視工字形に形成され、該可撓片の先端に前記連結溝の拡開段部に係合可能な係止片が厚さ方向に連設されており、
隣接する締付片の連結溝内に、前記接続具を側方より挿入し、リング状に連結した時、前記締付具の内径を流体管の外径よりも大径に保持されることを特徴としている。
【００１３】
上記締付具の各締付片の内面には円周方向を向く刃が形成されていることが好ましい。
【００１４】
上記押輪が円周方向に複数に分割可能に構成されていることが好ましい。
【００１５】
本発明の管の固定装置によると、締付具をＴ字管の側端面又は受口部の開口端面と当接させて流体管に外嵌したのち、流体管に外嵌した押輪のフランジを、締付手段をもってＴ字管又は受口部に締付けると、押輪の押圧部のテーパ面が締付具の外周面のテーパ面に圧接して、締付具を縮径方向に押圧する。これにより、締付具は流体管の外周面に強く圧接し、Ｔ字管が流体管に強固に固定されたり、又は流体管の受口部よりの離脱が防止される。
【００１６】
【発明の実施の形態】
以下、本発明の実施例を図面に基づいて説明する。
【００１７】
図１は、本発明の固定装置１を用いて、割Ｔ字管２をポリエチレン製の既設の水道管３に装着した第１実施例を示している。
【００１８】
割Ｔ字管２は、ダクタイル鋳鉄製で、上半部の分岐管部４を有する半円筒形のＴ字管本体２ａと、これにメタルタッチ状態で締結された下半部の半円筒形のカバー体２ｂとからなっており、公知の不断水工法により分岐管部４を通して水道管３に分岐口３ａを穿設し、水道管３の水道水を分岐させるものである。
【００１９】
割Ｔ字管２と水道管３の外周面との水密性は、Ｔ字管本体２ａ及びカバー体２ｂの突合わせ対向面と両側端部内面に嵌合されたパッキン５により保持されている。
【００２０】
Ｔ字管本体２ａとカバー体２ｂの両側端には、拡径部６が形成され、その開口端にはフランジ６ａが連設されている。
【００２１】
固定装置１は、割Ｔ字管２の両側方に設けられ、フランジ７ａと割Ｔ字管２側を向く押圧部７ｂを有する２つの割型の押輪７と、フランジ７ａと割Ｔ字管２のフランジ６ａとを締結する複数のＴ頭ボルト８及びナット９と、上記Ｔ字管本体２ａとカバー体２ｂの拡径部６の内面の環状空間内に収容された締付具１０とからなっている。なお、押輪７はダクタイル鋳鉄により形成されている。
【００２２】
上記押圧部７ｂの内面は、割Ｔ字管２側に向かって漸次拡径するテーパ面として、後記する締付具１０の外周面のテーパ面と密接するようにしてある。
【００２３】
締付具１０は、図２に示すように、水道管３よりも硬質の合成樹脂、例えばアセタール樹脂等よりなる複数（実施例では６個）の円弧状の締付片１０ａを、接続具１１によりリング状に連結して構成されている。各締付片１０ａは、図４に示すように、外周面が上記押圧部７ｂの内面と同じ傾斜のテーパ面をなすとともに、内面には、円周方向を向く複数の刃１０ｂが形成されている。
【００２４】
各締付片１０ａの対向端面１０ｃとそれに連なる割Ｔ字管２側の側面１０ｄには、一方の面が開口するスリット状の連結溝１２が連通状に形成され、その奥部は、先細り状に拡幅させてある。
【００２５】
接続具１１は、アセタール樹脂等により正面視工字形をなすように形成され、基部１１ａの上下両端部に、弾性変形可能な薄肉の可撓片１１ｂが、側方を向いて互いに平行に連設されている。可撓片１１ｂ間の寸法は、上記連結溝１２の溝幅とほぼ同等か若干小寸としてあり、また可撓片１１ｂの先端には、連結溝１２の拡開段部１２ａに係合可能な係止片１１ｃが厚さ方向に連設されている。
【００２６】
各締付片１０ａは、図３及び図５に示すように、隣接する締付片１０ａの端部の各連結溝１２内に、接続具１１を側方より挿入することにより、リング状に連結されている。この連結時において、締付具１０の内径は、水道管３の外径よりも若干大となるように拡径方向に弾性的に押し開かれている。
【００２７】
上記実施例の固定装置１を用いて、割Ｔ字管２を既設の水道管３に固定的に装着するには、図１に示すように、Ｔ字管本体２ａとカバー体２ｂを水道管３に取付けた状態で、まず２個の締付具１０を、その外周面のテーパ面の大径側を内方（割Ｔ字管側）に向けて、Ｔ字管本体２ａ及びカバー体２ｂの両端の拡径部６内に挿入し、両締付具１０の内側面を垂直面状の拡径段部６ｂに当接させる。
【００２８】
上記締付具１０を取付ける際は、３個ずつの締付片１０ａを接続具１１により半円状に連結してから、それらを水道管３の外周面に添わせ、互いに対向する端部同士を接続具１１により連結してリング状の締付具１０とし、これを拡径部６内に挿入すればよい。
【００２９】
締付具１０を両拡径部６内に挿入したのち、２分割構造の押輪７を水道管３の外周面に取付け、押圧部７ｂの先端部を割Ｔ字管２の拡径部６内における内周面と締付具１０の外周面との間のクサビ状の隙間に挿入する。
【００３０】
ついで、Ｔ字管本体２ａとカバー体２ｂの両端のフランジ６ａと、押輪７のフランジ７ａ同士を、複数のＴ頭ボルト８とナット９により締付ける。すると締付具１０は、その外周のテーパ面が押圧部７ｂの内面のテーパ面により押圧されることにより、半径方向に縮径させられる。
【００３１】
すなわち、締付具１０が押圧されると、図６に示すように、各締付片１０ａが接続片１１の可撓片１１ｂを撓ませて半径方向に押動されることにより縮径させられる。
【００３２】
これにより、各締付片１０ａの刃１０ｂが水道管３の外周面に食い込んで係止され、割Ｔ字管２は、締付片１０ａに圧接している押圧部７ｂ、すなわち押輪７と、そのフランジ７ａに取付けたＴ頭ボルト８とナット９とを介して、水道管３に強固に装着される。
【００３３】
なお、上記締付片１０ａにおける刃１０ｂの食い込み量は、ナット９の締付トルクを設定するか、又は押圧部７ｂの先端を拡径段部６ｂに当接させるようにしてナット９のねじ込み量を規制したり、フランジ６ａと７ａとの対向面のいずれか一方に想像線のようなストッパ１３を設けて、ナット９のねじ込み量を規制するなどすれば、適宜に調整することができる。
【００３４】
図７は、本発明の固定装置１を、従来のような離脱防止装置として、流体管同士の継手部に設けた第２実施例を示している。
【００３５】
同図において、１４は、ダクタイル鋳鉄製よりなる一方の流体管の受口部、１５は、受口部１４内に挿入された、ダクタイル鋳鉄製の他方の流体管の挿口部で、それらの嵌合部間の隙間は、受口部１４の内周面の環状溝内に嵌合されたパッキン１６により水密性が保持されている。
【００３６】
受口部１４の開口端部には、拡径部１４ａが形成され、その端部にはフランジ１４ｂが連設されている。
【００３７】
挿口部１５の離脱防止を図るには、まず上記と同様、複数の締付片１０ａを接続具１１により連結したリング状の締付具１０を、拡径部１４ａ内に挿入する。なお、この際の各締付片１０ａの材質は、ステンレス系の硬質金属材とするのがよい。
【００３８】
ついで、上述と同様の２つ割構造の押輪７を挿口部１５の外周面に装着し、その押圧部７ｂを、拡径部１４ａ内における内周面と締付具１０の外周面との間のクサビ状の隙間に挿入する。
【００３９】
ついで、受口部１４のフランジ１４ｂと押輪７のフランジ７ａとを、複数のＴ頭ボルト８とナット９により締付ける。
【００４０】
これにより締付具１０は、上述と同様半径方向に縮径させられ、各締付片１０ａの刃１０ｂが挿口部１５の外周面に食い込むことにより、挿口部１５の受口部１４よりの離脱が防止される。
【００４１】
なお、この第２実施例の双方の流体管は、ポリエチレン等の軟質管でもよく、この際は、各締付片１０ａは、上記と同様、アセタール樹脂等としてもよい。
【００４２】
また、このような流体管同士の接続及び離脱防止は、通常、新規に管を布設する際に行われるため、押輪７を分割構造としないでリング状としてもよい。
【００４３】
以上説明したように、本発明の固定装置１を用いると、割Ｔ字管２を水道管３に固定する際や、流体管同士を離脱防止を図りながら接続する際に、単に押輪７のみをＴ頭ボルト８とナット９により締付け、締付具１０を管の外周面に圧接するだけでよいので、従来のような押しボルト等が不要となり、部品点数及び作業工数が削減されるとともに、押輪７等の構造が簡素化し、コスト低減が可能となる。
【００４４】
また、締付具１０は、テーパ状の押圧部７ｂにより均一に押圧されるので、従来の押しボルトのように何ら熟練を必要としない。
【００４５】
さらに、締付具１０の内径は、水道管３の外径よりも大径としてあるので、軟質管であっても定位置以外に傷を付ける恐れはない。
【００４６】
なお、上記第１、第２実施例においては、いずれも拡径部６及び１４ａを形成して、この内面に締付具１０を挿入しているが、図１及び図７の想像線で示すように、拡径部６、１４ａを省略して、割Ｔ字管２及び受口部１４の開口端にフランジ１８を連設し、このフランジ１８と押輪７のフランジ７ａとをＴ頭ボルト８とナット９により締付けるようにしてもよい。
【００４７】
要するに、割Ｔ字管２及び受口部１４には、締付具１０を押圧部７ｂにより押圧した際に、締付具１０が押圧方向（管軸方向）に移動するのを阻止するストッッパ面があればよい。
【００４８】
【発明の効果】
本発明によれば、次のような効果が得られる。
【００４９】
（ａ）押輪を締付手段によりＴ字管等に締結するだけで、押圧部により押圧された締付具が流体管の外周面に強く圧接して、Ｔ字管を流体管に固定したり、流体管の受口部よりの離脱を防止することができる。
従って、従来の押しボルト等が不要となり、部品点数及び作業工数を削減しうるとともに、押輪等の構造が簡素化し、製造コストが低減される。
また、締付具は、押圧部のテーパ面により均一に押圧されるので、従来の押しボルトのように何ら熟練を必要としない。
【００５０】
更に、隣接する締付片の連結溝内に、前記接続具を側方より挿入し、リング状に連結した時、前記締付具の内径を流体管の外径よりも大径に保持されるため、軟質の流体管に適用しても、装着時において定位置以外に傷を付けたりすることはない。
【００５１】
（ｂ）請求項２の発明によると、刃が流体管の外周面に食い込んでより強固な固定が可能となるとともに、既設の流体管にも容易に適用することができる。
【００５２】
（ｃ）請求項３の発明によると、上記と同様、既設の流体管にも容易に適用しうる。
【００５３】
【図面の簡単な説明】
【図１】本発明を割Ｔ字管に適用した第１実施例を示す中央縦断側面図である。
【図２】締付具の正面図である。
【図３】締付片同士の連結部の一部切欠拡大正面図である。
【図４】図２におけるＩＶ−ＩＶ線に沿う拡大縦断側面図である。
【図５】締付片同士の連結部と接続具を示す一部切欠正面図である。
【図６】締付片縮径時における連結部の一部切欠正面図である。
【図７】本発明を流体管同士の継手部に設けられる離脱防止装置として適用した第２実施例を示す縦断側面図である。
【図８】従来の固定具を備える継手部の縦断側面図である。
【符号の説明】
１固定装置
２割Ｔ字管
３水道管
４分岐管部
５パッキン
６拡径部
６ａフランジ
７押輪
７ａフランジ
７ｂ押圧部
８Ｔ頭ボルト
９ナット
１０締付具
１０ａ締付片
１０ｂ刃
１１接続具
１１ａ基部
１１ｂ可撓片
１１ｃ係止片
１２連結溝
１２ａ拡開段部
１３ストッパ
１４受口部
１５挿口部
１６パッキン
１８フランジ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe fixing device that is provided, for example, at a joint between fluid pipes to prevent detachment of the pipe, or when a split T-shaped pipe or the like is firmly attached to a fluid pipe.
[0002]
[Prior art]
For example, when connecting water pipes or attaching a split T-shaped pipe for connecting a branch pipe to the water pipe, the pipes may come off due to earthquake vibrations caused by an earthquake, etc. A fixing tool such as a special push ring provided with a fastening tool is used so that the position of the character tube is not displaced.
[0003]
FIG. 9 shows a joint portion between tubes to which a conventional detachment preventing device, which is a kind of fixture, is attached.
[0004]
In the same figure, the insertion port b at the end of the other fluid pipe is inserted into the receiving port a of one fluid pipe, and the gap between the fitting parts is the inner circumference of the receiving port a. The watertightness is maintained by the packing d inserted into the diameter-enlarged recess c of the surface.
[0005]
A separation preventing device e is mounted on the outer peripheral surface of the insertion portion b. The separation prevention device e includes a plurality of arc-shaped tightening members having a ring gland having a ring-shaped packing pressing portion f and a sharp blade portion housed in an annular groove on the inner circumferential surface of the pressing wheel g. A piece h, a plurality of push bolts i for pressing the fastening piece h and facing in a direction perpendicular to the pipe, a plurality of flange portions j connected to the outer peripheral surface of the push ring g, and a flange portion of the receiving portion a It comprises a T-head bolt 1 and a nut m that fasten k.
[0006]
In the above-described separation preventing device e, both side surfaces of each fastening piece h are constrained by an annular groove, and the outer peripheral surface is in contact with the push bolt i. Therefore, when the insertion portion b attempts to separate from the receiving portion a. The blade portion of each tightening piece h bites into the fluid pipe, thereby preventing separation.
[0007]
[Problems to be solved by the invention]
In the above-described conventional separation preventing device e, which is a fixture, when fixing both fluid pipes while preventing separation, two types of fixing means having different tightening directions and structures, that is, a plurality of push bolts i and Since the T-head bolts 1 and the nuts m are used, it takes time to tighten them, and particularly in the case of a large-diameter fluid pipe, the number of push bolts and the like increases, resulting in a reduction in work efficiency.
[0008]
Further, since it is necessary to form a boss portion for attaching the push bolt i, an annular groove for inserting the fastening piece h, etc. in the pusher wheel g, in the case of a cast product, the structure of the mold becomes complicated and large, and the cost increases. Invite.
[0009]
Furthermore, since each fastening piece h is fastened by an individual push bolt i, skill is required for evenly fastening them.
[0010]
The present invention has been made to solve the above-described problems. By fixing the pipe and pressing the fastener with a single member, the number of bolts and the like can be minimized and the structure can be simplified. It is an object of the present invention to provide a fixing device for a tube which can be made uniform and can press a fastening piece uniformly.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the fixing device of the present invention, the side end face of the T-shaped pipe or the like fitted to the outside fluid tube, or sides which may abut on the opening end surface of the socket portion of the joint portion or the like of the fluid conduit between A tightening tool that is fitted to the outer peripheral surface of the fluid pipe and has a tapered surface whose outer peripheral surface gradually expands toward the T-shaped tube or the receiving port side, and a side of the tightening tool Fastened to the fluid tube so that it can move in the axial direction of the fluid pipe, and an annular pressing part whose inner peripheral surface forms a tapered surface that can come into close contact with the outer peripheral surface of the fastener and the end of the T-shaped tube or the receiving part A push ring having a flange that can be fastened by means , and
The fastening tool comprises a plurality of arc-shaped fastening pieces and a connecting tool for connecting the fastening pieces to each other, and each fastening piece includes a circumferential end face of the fastening piece and an end face thereof. A slit-like connecting groove having one surface opened is formed on the side surface, and an expanding step portion wider than the groove width of the connecting groove is provided at the back of the connecting groove. Thin flexible pieces that can be elastically deformed are arranged in parallel with each other at the upper and lower ends of the base so as to be parallel to each other, and the connecting groove extends at the tip of the flexible pieces. A locking piece that can be engaged with the open step is connected in the thickness direction,
When the connecting tool is inserted from the side into the coupling groove of the adjacent clamping piece and connected in a ring shape, the inner diameter of the clamping tool is held larger than the outer diameter of the fluid pipe. It is a feature.
[0013]
It is preferable that a blade facing the circumferential direction is formed on the inner surface of each fastening piece of the fastening tool.
[0014]
It is preferable that the push wheel is configured to be divided into a plurality of pieces in the circumferential direction .
[0015]
According to the pipe fixing device of the present invention, the flange is attached to the fluid pipe after the fastener is brought into contact with the side end face of the T-shaped pipe or the opening end face of the receiving portion, and then fitted onto the fluid pipe. When the fastening means is tightened to the T-shaped tube or the receiving portion, the taper surface of the pressing portion of the press ring comes into pressure contact with the taper surface of the outer peripheral surface of the fastener to press the fastener in the diameter reducing direction. As a result, the fastener is strongly pressed against the outer peripheral surface of the fluid tube, and the T-shaped tube is firmly fixed to the fluid tube, or is prevented from being detached from the receiving portion of the fluid tube.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0017]
FIG. 1 shows a first embodiment in which a split T-shaped pipe 2 is mounted on an existing water pipe 3 made of polyethylene using the fixing device 1 of the present invention.
[0018]
The split T-shaped tube 2 is made of ductile cast iron, and has a semi-cylindrical T-shaped tube body 2a having an upper half branch tube portion 4 and a lower half semi-cylindrical shape fastened thereto in a metal touch state. It consists of a cover body 2b, and a branch port 3a is formed in the water pipe 3 through the branch pipe portion 4 by a known continuous water construction method, and the tap water in the water pipe 3 is branched.
[0019]
The water tightness between the split T-shaped pipe 2 and the outer peripheral surface of the water pipe 3 is maintained by the packing 5 fitted to the abutting facing surfaces of the T-shaped tube main body 2a and the cover body 2b and the inner surfaces of both end portions.
[0020]
An enlarged diameter portion 6 is formed at both ends of the T-shaped tube main body 2a and the cover body 2b, and a flange 6a is continuously provided at the open end.
[0021]
The fixing device 1 is provided on both sides of the split T-shaped tube 2, and includes two split-type push wheels 7 each having a pressing portion 7b facing the flange 7a and the split T-shaped tube 2, and the flange 7a and the split T-shaped tube 2. A plurality of T-head bolts 8 and nuts 9 for fastening the flange 6a, and a fastening tool 10 accommodated in the annular space on the inner surface of the expanded portion 6 of the T-tube main body 2a and the cover body 2b. ing. The press wheel 7 is made of ductile cast iron.
[0022]
The inner surface of the pressing portion 7b is in close contact with the tapered surface of the outer peripheral surface of the fastener 10 described later as a tapered surface that gradually increases in diameter toward the split T-shaped tube 2 side.
[0023]
As shown in FIG. 2, the fastening tool 10 includes a plurality of (six in the embodiment) arcuate fastening pieces 10 a made of a synthetic resin harder than the water pipe 3, for example, acetal resin, and the like. Are connected in a ring shape. As shown in FIG. 4, each fastening piece 10a has a tapered surface whose outer peripheral surface is the same as the inner surface of the pressing portion 7b, and a plurality of blades 10b facing the circumferential direction are formed on the inner surface. Yes.
[0024]
A slit-like connecting groove 12 having an opening on one surface is formed in a continuous shape on the opposing end surface 10c of each fastening piece 10a and the side surface 10d on the side of the split T-tube 2 connected to the opposite end surface 10c. It is widened.
[0025]
The connector 11 is formed in a front-viewed shape with acetal resin or the like, and thin flexible pieces 11b that can be elastically deformed are provided in parallel to each other at the upper and lower ends of the base 11a. Has been. The dimension between the flexible pieces 11b is substantially the same as or slightly smaller than the groove width of the connecting groove 12, and the flexible piece 11b can be engaged with the expanding step portion 12a of the connecting groove 12 at the tip. The locking piece 11c is continuously provided in the thickness direction.
[0026]
As shown in FIGS. 3 and 5, each fastening piece 10a is connected in a ring shape by inserting the connection tool 11 from the side into each connecting groove 12 at the end of the adjacent fastening piece 10a. Has been. At the time of this connection, the inner diameter of the fastener 10 is elastically pushed open in the diameter increasing direction so as to be slightly larger than the outer diameter of the water pipe 3.
[0027]
In order to fix the split T-shaped pipe 2 to the existing water pipe 3 by using the fixing device 1 of the above embodiment, as shown in FIG. 1, the T-shaped pipe body 2a and the cover body 2b are connected to the water pipe. In the state where it is attached to 3, the two clamps 10 are first arranged so that the large diameter side of the tapered surface of the outer peripheral surface faces inward (the split T-shaped tube side), and the T-shaped tube body 2a and the cover body 2b. Are inserted into the enlarged diameter portions 6 at both ends, and the inner side surfaces of the two fasteners 10 are brought into contact with the enlarged diameter step portions 6b having a vertical plane.
[0028]
When attaching the fastening tool 10, three fastening pieces 10 a are connected in a semicircular shape by the connecting tool 11, and then attached to the outer peripheral surface of the water pipe 3, and the ends facing each other Are connected by a connecting tool 11 to form a ring-shaped fastening tool 10, which is inserted into the enlarged diameter portion 6.
[0029]
After inserting the fastener 10 into both the enlarged diameter portions 6, a two-part structure push ring 7 is attached to the outer peripheral surface of the water pipe 3, and the tip of the pressing portion 7 b is placed in the enlarged diameter portion 6 of the split T-shaped pipe 2. Is inserted into a wedge-shaped gap between the inner peripheral surface and the outer peripheral surface of the fastener 10.
[0030]
Next, the flanges 6 a at both ends of the T-shaped tube main body 2 a and the cover body 2 b and the flanges 7 a of the press ring 7 are fastened by a plurality of T-head bolts 8 and nuts 9. Then, the fastening tool 10 is reduced in diameter in the radial direction by the outer peripheral tapered surface being pressed by the inner tapered surface of the pressing portion 7b.
[0031]
That is, when the fastening tool 10 is pressed, each fastening piece 10a is reduced in diameter by bending the flexible piece 11b of the connection piece 11 and being pushed in the radial direction as shown in FIG. .
[0032]
Thereby, the blade 10b of each fastening piece 10a bites into the outer peripheral surface of the water pipe 3 and is locked, and the split T-shaped pipe 2 is pressed against the fastening piece 10a, that is, a press ring 7; It is firmly attached to the water pipe 3 via a T-head bolt 8 and a nut 9 attached to the flange 7a.
[0033]
The amount of biting of the blade 10b in the tightening piece 10a is determined by setting the tightening torque of the nut 9 or screwing the nut 9 so that the tip of the pressing portion 7b is in contact with the enlarged diameter step portion 6b. It can be adjusted as appropriate by regulating the amount of screwing of the nut 9 by providing a stopper 13 such as an imaginary line on one of the opposing surfaces of the flanges 6a and 7a.
[0034]
FIG. 7 shows a second embodiment in which the fixing device 1 of the present invention is provided at a joint portion between fluid pipes as a conventional detachment preventing device.
[0035]
In the same figure, 14 is a receiving part of one fluid pipe made of ductile cast iron, 15 is an insertion part of the other fluid pipe made of ductile cast iron inserted into the receiving part 14. The gap between the fitting portions is kept watertight by the packing 16 fitted in the annular groove on the inner peripheral surface of the receiving portion 14.
[0036]
An enlarged diameter portion 14a is formed at the opening end of the receiving portion 14, and a flange 14b is continuously provided at the end.
[0037]
In order to prevent the insertion portion 15 from being detached, first, similarly to the above, the ring-shaped fastening tool 10 in which a plurality of fastening pieces 10a are connected by the connection tool 11 is inserted into the enlarged diameter portion 14a. In addition, the material of each fastening piece 10a at this time is preferably a stainless hard metal material.
[0038]
Next, the split wheel 7 having the same split structure as described above is attached to the outer peripheral surface of the insertion portion 15, and the pressing portion 7 b is connected to the inner peripheral surface in the enlarged diameter portion 14 a and the outer peripheral surface of the fastener 10. Insert in the wedge-shaped gap between them.
[0039]
Next, the flange 14 b of the receiving portion 14 and the flange 7 a of the press ring 7 are fastened by a plurality of T-head bolts 8 and nuts 9.
[0040]
Thereby, the diameter of the fastening tool 10 is reduced in the radial direction in the same manner as described above, and the blade 10b of each fastening piece 10a bites into the outer peripheral surface of the insertion part 15 so that the reception part 14 of the insertion part 15 The withdrawal of is prevented.
[0041]
Both fluid pipes of the second embodiment may be soft pipes such as polyethylene, and in this case, each fastening piece 10a may be acetal resin or the like as described above.
[0042]
The connection and separation preventing such fluid conduit each other, usually, to be done at the time of laying a new pipe, but it may also the ring without the split structure junk ring 7.
[0043]
As described above, when the fixing device 1 of the present invention is used, when the split T-shaped pipe 2 is fixed to the water pipe 3 or when connecting the fluid pipes while preventing separation, only the push ring 7 is used. T-head bolts 8 and nuts 9 are tightened, and the fastening tool 10 only needs to be pressed against the outer peripheral surface of the pipe, so that a conventional push bolt or the like becomes unnecessary, the number of parts and work man-hours are reduced, and the press ring The structure such as 7 is simplified and the cost can be reduced.
[0044]
Moreover, since the fastener 10 is pressed uniformly by the taper-shaped pressing portion 7b, it does not require any skill like a conventional push bolt.
[0045]
Furthermore, since the inner diameter of the fastener 10 is larger than the outer diameter of the water pipe 3, there is no risk of scratching other than the fixed position even if it is a soft pipe.
[0046]
In each of the first and second embodiments, the enlarged diameter portions 6 and 14a are formed, and the fastener 10 is inserted into the inner surface. This is indicated by the imaginary lines in FIGS. Thus, the enlarged diameter portions 6 and 14 a are omitted, and a flange 18 is connected to the open ends of the split T-tube 2 and the receiving portion 14, and the flange 18 and the flange 7 a of the presser wheel 7 are connected to the T-head bolt 8. And the nut 9 may be used.
[0047]
In short, the split T-shaped tube 2 and the receiving portion 14 have a stopper surface that prevents the fastener 10 from moving in the pressing direction (tube axis direction) when the fastener 10 is pressed by the pressing portion 7b. If there is.
[0048]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0049]
(A) The fastening tool pressed by the pressing portion is pressed strongly against the outer peripheral surface of the fluid pipe simply by fastening the press ring to the T-shaped pipe or the like by fastening means, and the T-shaped pipe is fixed to the fluid pipe. , It is possible to prevent the fluid pipe from being detached from the receiving portion.
Therefore, a conventional push bolt or the like is not required, the number of parts and work man-hours can be reduced, the structure of the push wheel and the like is simplified, and the manufacturing cost is reduced.
Further, since the fastener is uniformly pressed by the tapered surface of the pressing portion, it does not require any skill like a conventional push bolt.
[0050]
Further, when the connecting tool is inserted from the side into the coupling groove of the adjacent clamping piece and connected in a ring shape, the inner diameter of the clamping tool is held larger than the outer diameter of the fluid pipe. For this reason, even if it is applied to a soft fluid pipe, it will not be damaged other than in a fixed position at the time of mounting.
[0051]
(B) According to the invention of claim 2 , the blade bites into the outer peripheral surface of the fluid pipe and can be fixed more firmly, and can be easily applied to an existing fluid pipe.
[0052]
(C) According to the invention of claim 3 , it can be easily applied to an existing fluid pipe as described above.
[0053]
[Brief description of the drawings]
FIG. 1 is a central longitudinal sectional side view showing a first embodiment in which the present invention is applied to a split T-shaped tube.
FIG. 2 is a front view of a fastener.
FIG. 3 is a partially cutaway enlarged front view of a connecting portion between fastening pieces.
4 is an enlarged longitudinal side view taken along line IV-IV in FIG. 2. FIG.
FIG. 5 is a partially cutaway front view showing a connecting portion and a connecting tool between fastening pieces.
FIG. 6 is a partially cutaway front view of a connecting portion when a tightening piece is reduced in diameter.
FIG. 7 is a longitudinal side view showing a second embodiment in which the present invention is applied as a detachment preventing device provided at a joint portion between fluid pipes.
FIG. 8 is a longitudinal side view of a joint portion including a conventional fixture.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixing device 2 Split T-shaped pipe 3 Water pipe 4 Branch pipe part 5 Packing 6 Expanded diameter part 6a Flange 7 Push ring 7a Flange 7b Press part 8 T head bolt 9 Nut 10 Fastening tool 10a Fastening piece 10b Blade 11 Connecting tool 11a Base part 11b Flexible piece 11c Locking piece 12 Connection groove 12a Expanding step part 13 Stopper 14 Receiving part 15 Inserting part 16 Packing 18 Flange

Claims

Side end surface of the T-shaped pipe or the like fitted to the outside fluid tube, or the end face of the opening of the mouth part of the joint or the like of the fluid pipe together has a side surface that can contact, is fitted on the outer peripheral surface of the fluid pipe, A fastener having a tapered surface whose outer peripheral surface gradually increases in diameter toward the T-shaped tube or the receiving portion side, and a fluid pipe on the side of the fastener that is externally fitted so as to be movable in the tube axis direction. An annular pressing portion having a tapered surface whose peripheral surface can be brought into close contact with the outer peripheral surface of the fastener, and a press ring having a flange that can be tightened with a fastening means at an end portion of the T-shaped tube or the receiving portion ,
The fastening tool comprises a plurality of arc-shaped fastening pieces and a connecting tool for connecting the fastening pieces to each other, and each fastening piece includes a circumferential end face of the fastening piece and an end face thereof. A slit-like connecting groove having one surface opened is formed on the side surface, and an expanding step portion wider than the groove width of the connecting groove is provided at the back of the connecting groove. Thin flexible pieces that can be elastically deformed are arranged in parallel with each other at the upper and lower ends of the base so as to be parallel to each other, and the connecting groove extends at the tip of the flexible pieces. A locking piece that can be engaged with the open step is connected in the thickness direction,
When the connecting tool is inserted from the side into the coupling groove of the adjacent clamping piece and connected in a ring shape, the inner diameter of the clamping tool is held larger than the outer diameter of the fluid pipe. Characteristic tube fixing device.

The pipe fixing device according to claim 1, wherein a blade facing in a circumferential direction is formed on an inner surface of each fastening piece of the fastening tool .

2. The tube fixing device according to claim 1, wherein the push wheel is configured to be divided into a plurality of pieces in the circumferential direction .