JPH0640570U

JPH0640570U - Cast iron pipe joint for hot water piping

Info

Publication number: JPH0640570U
Application number: JP8306292U
Authority: JP
Inventors: 芳樹岡本
Original assignee: Kurimoto Ltd
Current assignee: Kurimoto Ltd
Priority date: 1992-11-06
Filing date: 1992-11-06
Publication date: 1994-05-31
Anticipated expiration: 2006-03-06
Also published as: JPH088382Y2

Abstract

(57)【要約】【目的】管内を温水が通過する鋳鉄管継手の機能を維
持する。【構成】受口１、挿口２、ゴム輪３、押輪４、Ｔ頭ボ
ルト５よりなる継手において、ゴム輪角部３４の底面３
１と接触する押輪の押圧面４１との間へ、底面とほぼ同
形環状のスラストリング６を介装した構成である。【効果】管内の温水のために加熱されゴム輪が熱膨張
しても、強度の高いスラストリング全面で受け止め応力
を分散するから、局部的な応力集中による裂断や亀裂の
懸念がない。 (57) [Summary] [Purpose] To maintain the function of a cast iron pipe joint where hot water passes through the pipe. [Structure] In a joint including a receiving opening 1, an insertion opening 2, a rubber ring 3, a push ring 4, and a T-head bolt 5, a bottom surface 3 of a rubber ring corner portion 34.
A ring-shaped thrust ring 6 having substantially the same shape as the bottom surface is interposed between the pressing surface 41 of the pressing wheel and the pressing surface 41. [Effect] Even if the rubber ring is thermally expanded by being heated by hot water in the pipe, the receiving stress is dispersed over the entire surface of the thrust ring having high strength, so that there is no fear of tearing or cracking due to local stress concentration.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

本考案は鋳鉄管継手のうち、特に管内に温水が通過して管や継手部の温度が上昇する管路の継手に係る。 The present invention relates to a cast iron pipe joint, particularly to a pipe joint in which hot water passes through the pipe and the temperature of the pipe and the joint portion rises.

【０００２】[0002]

【従来の技術】[Prior art]

地下に埋設して水道用水などを送水する管路を形成する管としては、ダクタイル鋳鉄製の遠心力鋳造管が主体となって使用されているが、この管の特徴の一つは拡径した受口とこの中へ嵌入する挿口を組み合わせた簡便な継手構造である。この構造によって現地における管の継合が比較的容易に進行し、管路形成の作業能率が他の管種、たとえば鋼管における突き合わせ溶接に比べて優れており、鋳鉄管が広く採用される理由の一つとなっている。 Centrifugal casting pipes made of ductile cast iron are mainly used as pipes that are buried underground to form water pipes for sending tap water, etc. This is a simple joint structure that combines the above-mentioned receiving port and the insertion port to be fitted therein. Due to this structure, the joining of pipes in the field proceeds relatively easily, and the work efficiency of pipe line formation is superior to other pipe types such as butt welding in steel pipes, which is the reason why cast iron pipes are widely adopted. It is one.

【０００３】鋳鉄管の継手の型式にはいくつかの種類が規定され、それによって受口、挿口の形状もまた、多少の変動が見られる。図２に示すのはＫ形と呼ばれている型式の継手構造であり、特徴とするところは外向きに拡径する傾斜内面１１ａを端部に具えた受口１ａと、該受口１ａ内へ嵌入する挿口２ａと、前記傾斜内面１１ａと挿口外周面２１ａ間で形成する円錐筒状空間内へ嵌合するゴム輪３ａと、該ゴム輪３ａの露出する底面３１ａを押圧する押輪４ａと、該押輪４ａと受口１ａの受口フランジ１２ａとを締結するＴ頭ボルト５ａよりなる点である。なお、このゴム輪３ａはその丸部３２ａが断面円形状で受口の傾斜内面１１ａの一番奥部に設けられた段差１３ａおよび水平内面１４ａへ圧着して、管内からの漏水を防止するシール作用を果し、丸部に続いてほぼ台形状に繋がる角部３４ａは、挿口の外周面２１ａに接する面と受口の傾斜内面１１ａに接する傾斜外面３３ａよりなり、丸部３２ａが管路内の水圧が外向きに押し出そうとする押圧力に対抗して支えるバックアップ作用を果しているのである。Several types of joints for cast iron pipes are specified, and thus the shapes of the socket and the socket also show some fluctuations. FIG. 2 shows a joint structure of a type called K type, which is characterized by a socket 1a having an inclined inner surface 11a that expands outwardly at the end and a socket 1a inside the socket 1a. A rubber ring 3a that fits into a conical tubular space formed between the inclined inner surface 11a and the outer peripheral surface 21a of the insert, and a push ring that presses the exposed bottom surface 31a of the rubber ring 3a. 4a and a T-head bolt 5a that fastens the push wheel 4a and the socket flange 12a of the socket 1a. In addition, the rubber ring 3a has a circular section 32a having a circular cross section and is crimped to the step 13a provided at the innermost portion of the inclined inner surface 11a of the receiving port and the horizontal inner surface 14a to prevent water leakage from the inside of the pipe. The corner portion 34a, which functions and which is connected to the circular portion and has a substantially trapezoidal shape, is composed of a surface contacting the outer peripheral surface 21a of the insertion opening and an inclined outer surface 33a contacting the inclined inner surface 11a of the receiving opening. The water pressure in the road acts as a backup against the pushing force that pushes outward.

【０００４】[0004]

【考案が解決しようとする課題】ここに述べたＫ形の鋳鉄管継手構造は、現在、各都市の水道用管路として正式に採用され規格化されている。水道用または下水、農業用水の管路として使用されている場合には、まったく問題がなく信頼性も十分高い評価を受けている。ところが近年、ダクタイル鋳鉄管の使用される分野が従来よりも拡大し、従来の水道関係以外の装置や施設に適用されることも最早珍しくなくなり、この傾向はますます助長されると予想されている。そのため、従来はあまり問題とならなかった種々の課題が新たに発生し始めたが、そのうち管路内へ常温以上の温水が通過する場合には継手部分における熱膨張による悪影響が一つの課題として解決を迫られるようになった。The K-shaped cast iron pipe joint structure described here is officially adopted and standardized as a water pipe for each city. When it is used as a pipeline for water supply, sewage, or agricultural water, it has no problems at all and is highly evaluated for its reliability. In recent years, the field of use of ductile cast iron pipes has expanded more than ever, and it is no longer unusual for it to be applied to equipment and facilities other than conventional water-related equipment, and this trend will be further promoted. Is expected. For this reason, various problems that were not very problematic in the past began to occur, but when hot water above room temperature passes through the pipeline, the adverse effect of thermal expansion at the joint is solved as one problem. Came to be pressed.

【０００５】図３はこの課題を説明する縦断正面図であり、管路内を常温以上の流体が通過すると、当然良熱伝導体である受口、挿口ともに昇温し流体とほぼ同温度にまでなる。両金属体に挟まれたゴム輪３ａもこの熱伝達を受けて温度が上昇して固定の熱膨張率に基いた膨張が現われる。本来、ゴム輪の形状は図２のようにその角部の底面３１ａは受口フランジ１２ａの外端面とほぼ同じレベルに揃えられ、受口、挿口間の円錐筒状空間を完全に充填した状態でセットされているから、ゴム輪の熱膨張分は底面から外へ向かって膨出せざるを得ない。底面は押輪４ａの押圧面４１ａが圧接しているから、この部分については変形が不可能であり、結局、図３のように底面の押圧面４１ａから外れた自由面だけが膨出して膨出部１０１が生じる。FIG. 3 is a vertical cross-sectional front view for explaining this problem. When a fluid at room temperature or higher passes through the pipe, both the inlet and the inlet, which are good heat conductors, naturally rise in temperature and the temperature is almost the same as that of the fluid. Up to The rubber ring 3a sandwiched between the two metal bodies also receives this heat and the temperature rises, and expansion based on the fixed coefficient of thermal expansion appears. Originally, as shown in FIG. 2, the shape of the rubber ring is such that the bottom surface 31a of the corner portion is aligned at substantially the same level as the outer end surface of the receiving flange 12a, and the conical cylindrical space between the receiving opening and the insertion opening is completely filled. Since it is set in the state, the thermal expansion of the rubber ring must bulge outward from the bottom surface. Since the pressing surface 41a of the pressing wheel 4a is in pressure contact with the bottom surface, it is impossible to deform this portion, and as a result, only the free surface that is off the pressing surface 41a of the bottom surface swells and swells as shown in FIG. Part 101 arises.

【０００６】ゴム輪３ａが常温の状態であれば、角部の底面に押輪４ａの押圧面４１ａが全面に接触しゴム本来の弾性を保ってシール作用を果しているから何の懸念もない。しかし、ゴム材が昇温すると周知のとおり本来の性質が変化し、特に図３のように膨出部が生じると、押圧面４１ａとの境界線１０２へ応力が集中するからこの部分から裂断が始まったり亀裂が走って角部のバックアップ機能が大幅に低下するという悪影響が出てくる。When the rubber ring 3a is at room temperature, there is no concern because the pressing surface 41a of the pressing wheel 4a contacts the entire bottom surface of the corner and maintains the original elasticity of the rubber to perform the sealing action. However, when the temperature of the rubber material rises, its original properties change as is well known. Especially, when a bulging portion is generated as shown in FIG. 3, stress concentrates on the boundary line 102 with the pressing surface 41a, so that cracking occurs from this portion. This will have the adverse effect that the disconnection will start or cracks will run and the corner backup function will be significantly reduced.

【０００７】本考案は以上に述べた課題を解決するために、温水などを送水する管路に使用してもその熱膨張による悪影響を受けない鋳鉄管継手の提供を目的とする。In order to solve the problems described above, an object of the present invention is to provide a cast iron pipe joint which is not adversely affected by its thermal expansion even when it is used in a pipe for feeding hot water or the like.

【０００８】[0008]

【課題を解決するための手段】[Means for Solving the Problems]

本考案に係る温水配管用の鋳鉄管継手部は、外向きに拡径する傾斜内面１１を端部に具えた受口１と、該受口１内へ嵌入する挿口２と、前記傾斜内面１１と挿口外周面２１間で形成する円錐筒状空間内へ嵌合するゴム輪３と、該ゴム輪３の露出する底面３１を押圧する押輪４と、該押輪４と受口１の受口フランジ１２とを締結するＴ頭ボルト５よりなる鋳鉄管の、いわゆるＫ形の継手部であり、ゴム輪３の断面は円形状の丸部３２に続き前記傾斜内面１１に適合する傾斜外面３３を有するほぼ台形の角部３５で繋がり、押輪４の押圧面４１とゴム輪３の底面３１との間に底面３１をほぼ被覆する同形環状のスラストリング６を介装したことによって前記の課題を解決した。 A cast iron pipe joint portion for hot water pipes according to the present invention comprises a socket 1 having an inclined inner surface 11 that expands outwardly at an end, an insertion slot 2 that is fitted into the socket 1, and the inclined inner surface. 11 and the outer peripheral surface 21 of the insertion hole, a rubber ring 3 that fits into a conical cylindrical space, a push ring 4 that presses the exposed bottom surface 31 of the rubber ring 3, and a receiving ring of the push ring 4 and the receiving port 1. This is a so-called K-shaped joint portion of a cast iron pipe composed of a T-head bolt 5 that fastens with the mouth flange 12, and the rubber ring 3 has a circular round portion 32 followed by an inclined outer surface 33 that conforms to the inclined inner surface 11. The above-mentioned problem is caused by interposing the same-shaped annular thrust ring 6 which substantially connects the bottom surface 31 between the pressing surface 41 of the pressing wheel 4 and the bottom surface 31 of the rubber ring 3 and which is connected by a substantially trapezoidal corner portion 35 having Solved.

【０００９】また、この構成において、スラストリング６が、高強度樹脂、繊維強化樹脂、金属の何れかから選ばれた一つ、または二つ以上の組み合わせからなることがきわめて望ましい。In addition, in this configuration, it is extremely desirable that the thrust ring 6 is made of one or a combination of two or more selected from high-strength resin, fiber-reinforced resin, and metal.

【００１０】[0010]

【作用】[Action]

ゴム輪の角部の底面の外面のほとんどは強度の高いスラストリングによって被覆されているから、ゴム材が熱膨張したときに、その膨張分は底面が全面的に接するスラストリングを均一に押圧して外向けの外力となるが、スラストリング自身は機械的な強度も大きくかつ、ゴム輪全体の膨出しようとする開口面全面と密着しているから、この全面で外向きに膨出しようとするゴムの膨張力を受けたとき、変形に対する抵抗力が従来より格段に高く、しかも密着面全体でこの変形量を受け止めるので、僅かな平行移動によって膨張の変形量を吸収し、当然応力が集中するような特定の箇所も発生しない。すなわちゴム輪の底面と押輪の押圧面との境界線上にいかなる亀裂も裂断も発生することなく、長期に亘って完全に継手機能を満足する状態が続く。 Most of the outer surface of the bottom of the corner of the rubber ring is covered by the thrust ring with high strength, so when the rubber material thermally expands, the expansion causes the thrust ring with which the bottom surface is in full contact to be uniform. The thrust ring itself has a large mechanical strength and is closely attached to the entire opening surface of the entire rubber ring that is about to swell, so that the entire surface faces outward. When the expansion force of the rubber that is about to swell is received, the resistance to deformation is much higher than before, and the amount of deformation is absorbed by the entire contact surface, so the amount of expansion deformation is absorbed by a slight parallel movement, Naturally, there is no specific place where stress concentrates. That is, no cracks or tears occur on the boundary line between the bottom surface of the rubber ring and the pressing surface of the push ring, and the state where the joint function is completely satisfied continues for a long time.

【００１１】[0011]

【実施例】【Example】

図１は本考案の実施例を示す縦断正面図である。図において、ダクタイル鋳鉄製の鋳鉄管の受口１は接合部に面して受口フランジ１２を周設し、挿口２を嵌入する内部には傾斜内面１１を形成しその深奥部に段差１３および水平内面１４を具え、さらに緩傾斜内面１６と最深部に第二の段差１５を設けて終る。挿口２は直管部と同径の外周面２１からなり、その先端は受口内へ挿通して第二の段差１５の近くにまで達する。受口の傾斜内面１１と挿口の外周面とで形成する円錐筒状の空間へゴム輪３を介装する。ゴム輪３の底面を押輪４の押圧面４１が押し、この押輪４はＴ頭ボルト５によって受口フランジ１２と螺合してゴム輪３を内側へ押し込む構成を採る。 FIG. 1 is a vertical sectional front view showing an embodiment of the present invention. In the figure, a socket 1 of a cast iron pipe made of ductile cast iron is provided with a socket flange 12 around the joint, and a slanted inner surface 11 is formed inside the socket 2 into which a step 13 is formed at a deep portion. And a horizontal inner surface 14, and further, a gentle sloped inner surface 16 and a second step 15 at the deepest portion are provided. The insertion port 2 is composed of an outer peripheral surface 21 having the same diameter as the straight pipe portion, and the tip of the insertion port 2 is inserted into the receiving port and reaches near the second step 15. The rubber ring 3 is interposed in the conical cylindrical space formed by the inclined inner surface 11 of the receiving opening and the outer peripheral surface of the insertion opening. The pressing surface 41 of the push wheel 4 pushes the bottom surface of the rubber wheel 3, and the push wheel 4 is screwed into the socket flange 12 by the T-head bolt 5 to push the rubber wheel 3 inward.

【００１２】ゴム輪３は弾性に富み水封機能に優れたゴム材を材料として成形され、受口内の段差１３および水平内面１４に嵌合する先端の断面円形の丸部３２と、これに続く断面ほぼ台形の角部３４とで構成されている。丸部がシール作用を、また、角部が丸部の受ける管路からの水圧に対抗するバックアップ作用をそれぞれ受持つ点は従来と変らない。The rubber ring 3 is formed by using a rubber material having a high elasticity and an excellent water-sealing function, and a round portion 32 having a circular cross section at the tip end which fits to the step 13 and the horizontal inner surface 14 in the receiving port, and the following And a corner portion 34 having a substantially trapezoidal cross section. The point that the round part receives the sealing action and the corner part performs the backup action against the water pressure from the pipe that the round part receives is the same as before.

【００１３】角部３４の底面３１は受口フランジ１２の端面とほぼ同一のレベルとなるように受口、挿口間の空隙へ充填されている。この底面３１をほぼ被覆する形で同形のスラストリング６を押輪４の押圧面４１との間に介装している。スラストリング６は当然、環状であり挿口の外周面２１より僅かに大きな内径を具え、受口の傾斜内面１１の端部開口部の内径より僅かに小さい外径よりなる。また、完結した一体的な環状でなく、一箇所で切断された分割型の環状であってもよい。The bottom surface 31 of the corner portion 34 is filled in the space between the receiving opening and the insertion opening so that the bottom surface 31 is at substantially the same level as the end surface of the receiving flange 12. A thrust ring 6 having the same shape as the bottom surface 31 is substantially covered and is interposed between the thrust ring 6 and the pressing surface 41 of the pressing wheel 4. The thrust ring 6 is, of course, annular and has an inner diameter slightly larger than the outer peripheral surface 21 of the insertion port, and an outer diameter slightly smaller than the inner diameter of the end opening of the inclined inner surface 11 of the receiving port. Further, it may not be a complete and integrated ring, but may be a split ring that is cut at one place.

【００１４】スラストリング６の材質としては、特に高強度樹脂、たとえばポリエチレン樹脂や、金属、たとえば銅合金、ニッケル合金などが望ましい。または金属繊維やガラス繊維で強化した繊維強化プラスチックなども好適な例である。As the material of the thrust ring 6, it is particularly preferable to use a high-strength resin such as polyethylene resin or a metal such as copper alloy or nickel alloy. Alternatively, fiber-reinforced plastics reinforced with metal fibers or glass fibers are also suitable examples.

【００１５】[0015]

【考案の効果】本考案は以上に述べたとおり、管路内を温水が常時通過して継手部の温度が上昇しても、従来のような熱膨張に基く悪影響が発生せず、冷水と同様にその継合機能が長く持続するので信頼性が高い。ここで対象となる継手の型式はＫ形と呼ばれる押輪を使用するものであるが、従来のＫ形と全体としては同一形状であるから、継合作業に変るところはなく能率的な施工が保証される。[Effects of the Invention] As described above, the present invention does not cause adverse effects due to thermal expansion as in the past, even when hot water constantly passes through the pipe line and the temperature of the joint rises, and cold water is not generated. It is highly reliable because its splicing function lasts for a long time. The type of joint to be used here uses a push ring called K type, but since it has the same overall shape as the conventional K type, there is no change to joining work and efficient construction is possible. Guaranteed.

【図面の簡単な説明】[Brief description of drawings]

【図１】本考案実施例の縦断正面図である。FIG. 1 is a vertical sectional front view of an embodiment of the present invention.

【図２】従来技術の縦断正面図である。FIG. 2 is a vertical sectional front view of a conventional technique.

【図３】従来技術の課題を説明する縦断正面図である。FIG. 3 is a vertical sectional front view for explaining the problems of the conventional technique.

【符号の説明】[Explanation of symbols]

１受口２挿口３ゴム輪４押輪５Ｔ頭ボルト６スラストリング 11 傾斜内面 12 受口フランジ 13 段差 14 水平内面 15 第二の段差 16 緩傾斜内面 21 外周面 31 底面 32 丸部 33 傾斜外面 34 角部 41 押圧面 1 Mouth 2 Inlet 3 Rubber ring 4 Push ring 5 T-head bolt 6 Thrust ring 11 Inclined inner surface 12 Mouth flange 13 Step 14 Horizontal inner surface 15 Second step 16 Sloped inner surface 21 Outer peripheral surface 31 Bottom surface 32 Rounded portion 33 Inclined outer surface 34 Corner 41 Pressing surface

Claims

【実用新案登録請求の範囲】[Scope of utility model registration request]

【請求項１】外向きに拡径する傾斜内面１１を端部に
具えた受口１と、該受口１内へ嵌入する挿口２と、前記
傾斜内面１１と挿口外周面２１間で形成する円錐筒状空
間内へ嵌合するゴム輪３と、該ゴム輪３の露出する底面
３１を押圧する押輪４と、該押輪４と受口１の受口フラ
ンジ１２とを締結するＴ頭ボルト５よりなる鋳鉄管の継
手部において、ゴム輪３の断面は円形状の丸部３２に続
き前記傾斜内面１１に適合する傾斜外面３３を有するほ
ぼ台形の角部３４で繋がり、押輪４の押圧面４１とゴム
輪３の底面３１との間に底面３１をほぼ被覆する同形環
状のスラストリング６を介装したことを特徴とする温水
配管用の鋳鉄管継手部。1. A receptacle 1 having an inclined inner surface 11 that expands outwardly at an end, an insertion opening 2 that is fitted into the accommodation 1, and an inclined inner surface 11 and an outer peripheral surface 21 of the insertion opening. A rubber ring 3 that fits into the conical tubular space that is formed, a push ring 4 that presses the exposed bottom surface 31 of the rubber ring 3, and a T-head that fastens the push ring 4 and the socket flange 12 of the socket 1. In the joint portion of the cast iron pipe consisting of the bolt 5, the rubber ring 3 is connected by a circular round portion 32 and a substantially trapezoidal corner portion 34 having an inclined outer surface 33 that conforms to the inclined inner surface 11. A cast iron pipe joint portion for hot water pipes, characterized in that an annular thrust ring 6 of the same shape that substantially covers the bottom surface 31 is interposed between the surface 41 and the bottom surface 31 of the rubber ring 3.

【請求項２】請求項１において、スラストリング６
が、高強度樹脂、繊維強化樹脂、金属の何れかから選ば
れた一つ、または二つ以上の組み合わせからなることを
特徴とする温水配管用の鋳鉄管継手部。2. The thrust ring 6 according to claim 1.
Is made of one or a combination of two or more selected from high-strength resin, fiber-reinforced resin, and metal, and a cast iron pipe joint portion for hot water piping.

【請求項３】請求項１または２において、スラストリ
ング６が一箇所で切断された分割型の環状であることを
特徴とする温水配管用の鋳鉄管継手部。3. The cast iron pipe joint portion for hot water pipes according to claim 1, wherein the thrust ring 6 is a split type annular ring cut at one place.