JP4098129B2

JP4098129B2 - External water pressure compatible water stop device

Info

Publication number: JP4098129B2
Application number: JP2003072478A
Authority: JP
Inventors: 征義伊藤; 皓一北村
Original assignee: 株式会社伊勢工業
Priority date: 2003-03-17
Filing date: 2003-03-17
Publication date: 2008-06-11
Anticipated expiration: 2023-03-17
Also published as: JP2004278709A

Description

【０００１】
【発明の属する技術分野】
本発明は、管体の内面に止水目的で配置される環状体と、環状体を内方から外方へ加圧して管体の内面に固定するための固定板とを有する止水装置であって、特に外水圧に対応する性能を具有する止水装置に関するものである。
【０００２】
【従来の技術】
地中に埋設されている管路は管体を接続して構築されており、管体接続部には漏水を防止するために、環状体と称する接続部材が設けられている。環状体は、ゴムなどの弾性材を管体の内径に合わせたサイズに形成したもので固定板を拡径して環状体を内方から外方へ向けて加圧することによって、管体の内面に固定されている。ところが、管体接続部に外水圧が作用すると、環状体特にその中央部付近が外水圧を受けて、内方へ膨出することにより流断面積が縮小し、内部流を阻害することがある。外水圧対策を講じないでいた場合には、流断面積の縮小だけではなく、環状体が破損する恐れを生ずる。
【０００３】
これに対して、管路の止水に用いる被覆体という特許２５８９１９１号の発明があり、同発明は管内壁に当てがうスリーブを正しい状態に維持し、また機械的強度を効果的に高める手段として、保持具を筒状とすることでスリーブの膨らみを防止しようとするものである。しかし、この発明では管路の継手部の軸線が直線でなければ、２つの筒の中に筒状のものを均等な圧力で装着することはできず、まして継手が不等沈下や地震等で変位した場合は、スリーブの止水効果は激減する、という問題がある。またスリーブの周りから中心に向かう力により生じる変形による流れの障害には着目していない。
【０００４】
【発明が解決しようとする課題】
本発明は前記の点に着目してなされたもので、その課題は、環状体を使用する止水装置において、外水圧により環状体が内方へ変形するのを防止することである。また本発明の他の課題は、外水圧対応型止水装置を、特に低損失水頭型として構成することである。
【０００５】
【課題を解決するための手段】
前記の課題を解決するため、本発明は管体の内面に止水目的で配置される、弾性材より成る環状体と、環状体を内方から外方へ加圧して管体の内面に固定するための固定板とを有する止水装置とし、外水圧の作用により環状体が内方へ変形するのを防止するために、環状体の一部に肉厚部を形成するとともに、この肉厚部を外水圧抵抗板によって覆い、固定板の拡径による加圧力によって、外水圧抵抗板を、環状体とともに管体の内面に固定する構成を有し、環状体は、肉厚部として中央部に内向きの凸部を有するとともに、凸部の両側に固定板を装着する凹部を有しており、凸部は外水圧に対抗する変形抵抗力を発揮する角部を両側に有しており、外水圧抵抗板は、環状体の凸部を覆う中央の角部と固定板によって固定される角部より外方の両側の部分に及ぶ、管体軸方向の切れ込みを有しており、それによって環状体への密着性を向上させるようにし、環状体は、凹部に固定板を装着して環状体を管体の内面に固定するときに、固定板が凹部に収まって中央の凸部を覆う外水圧抵抗板とほぼ同一の面をなし、かつまた、環状体の流れ方向の両端部は流水の抵抗の少ないベルマウス状の外面形状として低損失水頭型の構成を有しているものとするという手段を講じたものである。
【０００６】
本発明における止水装置は、環状体を管体の内方から外方へ固定板の拡径により加圧して固定するという基本構成を有している。環状体は止水手段として、ゴム又はこれと同効の樹脂材料を用いて型成形されているものであることを必要とする。また、環状体を固定する手段である固定板は鋼板等強靭な材料から成ることが望ましい。さらに、環状体と固定板とは水流の抵抗を小さくするために、管直径に占める厚さが小さくかつ低損失水頭型の構成を有することが望まれ、これにより、内部流への対応性をも具有した止水装置を構成することができる。
【０００７】
本発明の止水装置に使用する環状体には、外水圧が作用して環状体自体を内方へ変形することを防止するために、環状体の一部に肉厚部を形成する。肉厚部は外水圧抵抗板によって覆い、環状体を内方へ加圧しようとする外水圧に対抗せしめるものとする。外水圧抵抗板は、固定板によって環状体とともに管体の内面に固定される。
【０００８】
この肉厚部は環状体の中央部に内向きの凸部として形成するとともに、その両側に、固定板を装着するための凹部を形成することが望ましい。このように構成すると、固定板を凹部に収めて環状体を内方から外方へ拡径加圧するときに、固定板の内面と、中央の凸部を覆う外水圧抵抗板面とがほぼ同一の面をなし、凹凸を作らずに済むので渦の発生が防止される。さらに、環状体の流れ方向の両端部については、ベルマウス状の外面形状を有するものとすると、本発明の止水装置による管体内方への突出量を同等とする各種構造の中で、最も低損失水頭の装置を構成することができる。
【０００９】
外水圧抵抗板は、肉厚部としての凸部を中央に配置し、その両側に凹部を配置する環状体の実施形態に適合するように、凹部を覆う中央部とその両側の凹部に重なる両側部とを有する断面形状とすることができる（図２参照）。この場合、外水圧抵抗板は、固定板で圧接固定する環状体凹部に装着することにより、固定板の拡径時に発生する固定板とゴム製の環状体との摩擦抵抗力が著しく軽減されることに伴い、滑剤などを用いなくとも弾性を有する環状体をほぼ均等に圧縮固定することが可能となる。さらに外水圧抵抗板の上記中央部の角部と、角部よりも外方の両側部分に管体軸方向の切れ込みを形成することができ（図３参照）、それによって環状体への密着性を向上させることができる。
【００１０】
このような外水圧抵抗板は、周方向に複数部材に分割した構成とすることができ、各分割部材の端部を重ねるようにして環状体の内面に当てがい、ジャッキを用いて固定板を拡径し、固定するものとする。全周を複数部材に分割した帯板状の部材を用いる固定板は、本出願人が以前から採用して来た拡径による固定技術を適用することができる。この技術は例えば実公昭６４−６４７４号等に開示されている。なお、本発明の止水装置を管体の接続部に配置適用する場合、管体の内面との間には水膨張性のシール部材を装着し、外水圧遮断のためにさらに万全を期すことができる。
【００１１】
【発明の実施の形態】
以下図示の実施形態を参照して本発明をより詳細に説明する。図１は本発明に係る外水圧対応型止水装置１０の例示であり、本装置１０を管体接続部に適用したもので、１１、１１′は隣接する管体、１２は弾性材としてのゴムより成る環状体を示す。
【００１２】
環状体１２は、管体１１、１１′の内面に接する円環状を基本形状とし、その中央部に内向きの凸部１３を肉厚部として有している。凸部１３は図２に示すように、管体１１、１１′に許容される管体内方への突出量から決められる肉厚と、流れ方向の幅とを有し、環状体１２の剛性を中央部で高めている。凸部１３の両側には固定板１４を装着する凹部１５が設けてあり、凹部壁面には応力集中用の小リブ１６が設けられている。
【００１３】
環状体１２の流れ方向両端部には、低損失水頭のために流水抵抗の少ないベルマウス形状１７が設けられており、ベルマウス形状１７は、管内方の曲率よりも外方の曲率の方が大きいほぼ三日月状の断面形状を有している。またベルマウス形状１７はハンチ部１８を力点として管体内面に先端部１７ａを圧接可能になっている。環状体１２の外面には、管体内面に接する止水突条１９の対が、内面の凹部１５に対応する位置に設けられており、さらに、管体内面の多少の凹凸を補修することなく環状体１２を鋼製固定板１４の拡径圧力により確実に止水するために、水膨張性のシール部材２０を装着している。２１はシール部材装着部を示す。シール部材２０としては水膨張性スポンジを使用することができる。
【００１４】
環状体１２の凸部１３は、外水圧抵抗板２２によって覆われる。外水圧抵抗板２２は凸部１３のみならず凸部の角部１３ａをも覆い、かつ凹部１５の壁面にて固定板１４により圧接固定されるように加工された固定部２４を中央凸部２３の左右に有している。
【００１５】
外水圧抵抗板２２は、環状体１２の凸部１３の角部１３ａを覆って固定部２４へ延びる曲がり部２５を有し、曲がり部２５は管体軸方向の切れ込み２６によって分断され、曲げを容易にして環状体１２への密着性を向上させた構成を有する（図３参照）。切れ込み２６の間隔ｄは狭い方が、外水圧抵抗板２２の変形追従性を高める。このような外水圧抵抗板２２は、周方向に複数部分に分割したものを継ぎ合わせて環状体内面を覆う。図３（ａ）は半周型の外水圧抵抗板２０の例であり、これを２個用いると端部が重なって全周がつながるものである。例示の外水圧抵抗板２２はステンレス鋼板をプレス加工したものであるが、ステンレス金網をプレス加工したものでも、プラスチック製でも良いことは前述のとおりである。
【００１６】
固定板１４は、ジャッキ等を用いた拡径による、外水圧抵抗板２２及び環状体１２の管体内面への固定に耐えるようにステンレス鋼製の頑丈なバンド状のもので、施工の容易性のために周方向に複数部材に分割された数個から成る。図４はその例示であり、一方は３分割の例、他方は４分割の例であるが、分割部材は夫々一定寸ｓ、ｓ′、ｔ、ｔ′を有し、両端に１個ずつの長さ調整部３１、３２を有しており、また分割部材の両端に連結部３３、３４を有している。
【００１７】
固定板１４及びその連結の詳細は図５に示したとおりであり、分割部材同士は端を突き合わせ、連結部３３、３４をボルト３５を締めて連結され（図５（ｆ））、調整孔を多数有する一方の調整部３１と、長孔を有する他方の調整部３２とを重ね環状にして、図外のジャッキ等により固定板１４を十分に拡径し、ボルト３６を締めて接合する。固定板１４の重ね合わせ部の接合（図５（ｄ））は、固定板１４の片方をスロープ加工４０とし、調整部３２の先端部４２の厚みを固定板１４に溶接される端部４３より薄くすることにより、調整部３２を楔形状とし摩擦接合力を向上させ、固定板１４の外力に対するアーチ力を高めている。
【００１８】
固定板１４を拡径することにより、管体１１、１１′の内面目的部に予め配置されている環状体１２及びその凹部１５、１５に配置された外水圧抵抗板２２の固定部２４、２４を管体内面に圧接して固定することができ、同時にシール部材２０、２０も十分に加圧される。図１は仮想線で記載した管体１１、１１′と本装置１０及び本装置１０の凹部１５と外水圧抵抗板２２との間等に、隙間を潰さずに残したまま完成状態を図示しているが、便宜上のことであり全部圧接状態になる。なお、管体１１、１１′の端部間には機能が低下した止水リング２９が挿入されている。なおナット５０は、固定板１４の拡径ジャッキ受台の止め金具として用いる。
【００１９】
このような構成を有する本発明の止水装置１０を装着した管体１１、１１′では、外水圧が環状体１２の外部に加わった場合に、最も影響を受ける中央部に肉厚部として凸部１３が設けてあるため、従来よりも大きい外水圧に対抗することができる上に、環状体１２の内面に外水圧抵抗板２２が設けてあるため、環状体１２が外水圧を受けても内方へ膨出するに到らず、流断面積を縮小させたり内部流を阻害することもない。また、本発明の止水装置１０は凸部１３の突出量を抑制するとともに、環状体両端にベルマウス形状１７を設けていることにより低損失水頭型として構成されており、管体を流れる内部流に及ぼす影響が最少限度となる。
【００２０】
【発明の効果】
本発明は以上の如く構成されているので、環状体を使用する止水装置において、外水圧が作用しても環状体を変形させることがなく、内部流を阻害する恐れがないとともに、低損失水頭型として機能するので管体内に設置する止水装置として最適である。
【図面の簡単な説明】
【図１】本発明に係る外水圧対応型止水装置の実施形態を示す部分断面図。
【図２】同じく要部を拡大して示した分解断面図。
【図３】（ａ）本発明に適用する外水圧抵抗板を丸めた状態の斜視図。
（ｂ）同じく拡げた状態の斜視図。
【図４】固定板２種を示す平面図。
【図５】（ａ）固定板の分割部材の一部を示す平面図。
（ｂ）同上の側面図。
（ｃ）同じく長さ調整部の平面図。
（ｄ）同じく長さ調整部における接合状態を示す断面図。
（ｅ）同じく連結部の平面図。
（ｆ）同じく連結部における接合状態を示す断面図。
【符号の説明】
１０外水圧対応型止水装置
１１、１１′ 管体
１２環状体
１３肉厚部としての凸部
１４固定板
１５凹部
２０シール部材
２２外水圧抵抗板
２３中央凸部
２４固定部
２５曲がり部
２６切り込み[0001]
BACKGROUND OF THE INVENTION
The present invention is a water stop device having an annular body disposed on the inner surface of a tubular body for the purpose of waterproofing, and a fixing plate for pressurizing the annular body from the inside to the outside and fixing the annular body to the inner surface of the tubular body. In particular, the present invention relates to a water stop device having a performance corresponding to an external water pressure.
[0002]
[Prior art]
The pipe line buried in the ground is constructed by connecting pipes, and a connecting member called an annular body is provided at the pipe connecting part in order to prevent water leakage. The annular body is made of an elastic material such as rubber and is sized to match the inner diameter of the tubular body. The inner diameter of the tubular body is increased by increasing the diameter of the fixed plate and pressurizing the annular body from the inside to the outside. It is fixed to. However, when external water pressure acts on the tube connecting portion, the annular body, particularly the central portion thereof, receives the external water pressure and bulges inward, thereby reducing the flow cross-sectional area and obstructing the internal flow. . If measures against external water pressure are not taken, not only the flow cross-sectional area is reduced, but the annular body may be damaged.
[0003]
On the other hand, there is an invention of Japanese Patent No. 2589191 which is a covering used for water stoppage of a pipe, and this invention is a means for maintaining the sleeve applied to the inner wall of the pipe in a correct state and effectively increasing the mechanical strength. As described above, the sleeve is prevented from bulging by making the holder into a cylindrical shape. However, in this invention, if the axis of the joint part of the pipe line is not straight, it is not possible to attach a cylindrical thing in the two cylinders with equal pressure, and the joint will be unevenly subsidized, earthquakes, etc. When displaced, there is a problem that the water stop effect of the sleeve is drastically reduced. Further, no attention is paid to the flow obstruction caused by the deformation caused by the force from the circumference of the sleeve toward the center.
[0004]
[Problems to be solved by the invention]
The present invention has been made paying attention to the above points, and an object thereof is to prevent the annular body from being deformed inward by an external water pressure in a water stopping device using the annular body. Another object of the present invention is to configure the external water pressure compatible water stop device as a particularly low-loss head type.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is arranged on the inner surface of the tubular body for the purpose of water stoppage, and is fixed to the inner surface of the tubular body by pressurizing the annular body from the inside to the outside. and a fixing plate for the water stop device having, in order to prevent the annular body by the action of external pressure is deformed inwardly, to form a thick portion in a part of the annular body, the thickness part covered by the outer water pressure resistance plate, the pressure applied by the enlarged diameter of the fixed plate, an outer water pressure resistance plate has a structure fixed to the inner surface of the tube with the annular body, annular body, the central portion as thick portion Has inwardly convex portions and concave portions to which fixing plates are attached on both sides of the convex portions, and the convex portions have corner portions that exert deformation resistance against external water pressure on both sides. The outer hydraulic resistance plate has a central corner covering the convex portion of the annular body and a corner fixed by the fixing plate. It has a notch in the axial direction of the tube extending over both sides, thereby improving the adhesion to the annular body. The annular body is fitted with a fixing plate in the recess, and the annular body is attached to the tubular body. When fixing to the inner surface, the fixing plate is fitted in the recess and forms almost the same surface as the external hydraulic resistance plate that covers the central projection, and both ends in the flow direction of the annular body are bells with low resistance to running water. in which it took measures that shall have a low head loss type structure as mouse-like outer contour.
[0006]
The water stop device in the present invention has a basic configuration in which an annular body is pressed and fixed from the inside of the tube body to the outside by expanding the diameter of the fixing plate. The annular body needs to be molded using rubber or a resin material having the same effect as water-stopping means. Further, it is desirable that the fixing plate as a means for fixing the annular body is made of a tough material such as a steel plate. Further, in order to reduce the resistance of water flow, the annular body and the fixed plate are desired to have a small thickness occupying the pipe diameter and to have a low-loss head type configuration, thereby improving the compatibility with the internal flow. It is possible to constitute a water stop device having a tool.
[0007]
In the annular body used in the water stop device of the present invention, a thick portion is formed in a part of the annular body in order to prevent external water pressure from acting and deforming the annular body itself inward. The thick wall portion is covered with an external hydraulic pressure resistance plate to counter the external water pressure to pressurize the annular body inward. The external hydraulic resistance plate is fixed to the inner surface of the tubular body together with the annular body by the fixing plate.
[0008]
It is desirable that the thick portion is formed as an inward convex portion at the center of the annular body, and concave portions for mounting the fixing plate are formed on both sides thereof. With this configuration, when the fixing plate is housed in the recess and the annular body is expanded and pressurized from the inside to the outside, the inner surface of the fixing plate and the external hydraulic resistance plate surface covering the central protrusion are almost the same. This makes it possible to prevent the generation of vortices. Furthermore, regarding both ends in the flow direction of the annular body, assuming that it has a bell mouth-like outer surface shape, among the various structures that have the same amount of protrusion toward the inside of the tubular body by the water stop device of the present invention, A low-loss head can be constructed.
[0009]
The outer hydraulic resistance plate has a central portion covering the concave portion and both sides overlapping the concave portion on both sides so that the convex portion as the thick portion is arranged in the center and the concave portion is arranged on both sides so as to conform to the embodiment of the annular body. It can be set as the cross-sectional shape which has a part (refer FIG. 2). In this case, the external hydraulic pressure resistance plate is attached to the annular concave portion that is pressure-fixed by the fixing plate, so that the frictional resistance force between the fixing plate and the rubber annular member that is generated when the diameter of the fixing plate is increased is significantly reduced. Accordingly, it is possible to compress and fix the annular body having elasticity almost even without using a lubricant or the like. Furthermore, it is possible to form notches in the axial direction of the tubular body in the corner portion of the central portion of the external hydraulic resistance plate and on both side portions outside the corner portion (see FIG. 3), and thereby the adhesion to the annular body. Can be improved.
[0010]
Such an external hydraulic resistance plate can be divided into a plurality of members in the circumferential direction, applied to the inner surface of the annular body so that the ends of the divided members are overlapped, and the fixing plate is attached using a jack. The diameter shall be expanded and fixed. The fixing plate using a strip-shaped member whose entire circumference is divided into a plurality of members can be applied with a fixing technique based on diameter expansion that has been adopted by the present applicant. This technique is disclosed, for example, in Japanese Utility Model Publication No. 64-6474. In addition, when the water stop device of the present invention is disposed and applied to the connection portion of the pipe body, a water-swellable sealing member is attached between the inner surface of the pipe body, and further measures are taken to shut off the external water pressure. Can do.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. FIG. 1 is an illustration of an external water pressure responsive water stop device 10 according to the present invention, in which the device 10 is applied to a tube connecting portion, 11 and 11 'are adjacent tubes, and 12 is an elastic material. An annular body made of rubber is shown.
[0012]
The annular body 12 has an annular shape that is in contact with the inner surfaces of the tubular bodies 11 and 11 ′ as a basic shape, and has an inward convex portion 13 as a thick portion at the center. As shown in FIG. 2, the convex portion 13 has a wall thickness determined from the amount of protrusion to the tubular body 11 and 11 ′ and a width in the flow direction, and the rigidity of the annular body 12. It is raised at the center. Concave portions 15 for mounting the fixing plate 14 are provided on both sides of the convex portion 13, and small ribs 16 for stress concentration are provided on the concave portion wall surface.
[0013]
At both ends of the annular body 12 in the flow direction, a bell mouth shape 17 having a low flow resistance is provided for low loss head, and the bell mouth shape 17 has an outward curvature rather than an inward curvature. It has a large, almost crescent-shaped cross-sectional shape. Further, the bell mouth shape 17 can press the tip portion 17a to the inner surface of the tube body with the haunch portion 18 as a power point. On the outer surface of the annular body 12, a pair of water stopping ridges 19 in contact with the inner surface of the tube body is provided at a position corresponding to the recess portion 15 on the inner surface, and further, some unevenness on the inner surface of the tube body is not repaired. A water-expandable seal member 20 is mounted in order to reliably stop the annular body 12 by the diameter expansion pressure of the steel fixing plate 14. Reference numeral 21 denotes a seal member mounting portion. A water-expandable sponge can be used as the seal member 20.
[0014]
The convex portion 13 of the annular body 12 is covered with an external hydraulic resistance plate 22. The external hydraulic pressure resistance plate 22 covers not only the convex portion 13 but also the corner portion 13a of the convex portion, and the fixing portion 24 processed so as to be pressed and fixed by the fixing plate 14 on the wall surface of the concave portion 15 is the central convex portion 23. The left and right of
[0015]
The external hydraulic resistance plate 22 has a bent portion 25 that covers the corner portion 13a of the convex portion 13 of the annular body 12 and extends to the fixed portion 24. The bent portion 25 is divided by a cut 26 in the axial direction of the tube body, and is bent. It has the structure which made it easy and improved the adhesiveness to the annular body 12 (refer FIG. 3). The narrower the distance d between the notches 26, the better the deformation followability of the external hydraulic resistance plate 22. Such an external hydraulic resistance plate 22 covers the annular inner surface by joining together a plurality of parts divided in the circumferential direction. FIG. 3 (a) is an example of a half-circular external hydraulic resistance plate 20. When two of these are used, the ends overlap and the entire circumference is connected. The illustrated external hydraulic resistance plate 22 is formed by pressing a stainless steel plate, but as described above, it may be formed by pressing a stainless wire mesh or made of plastic.
[0016]
The fixing plate 14 is a solid band made of stainless steel so as to withstand the fixing of the outer hydraulic resistance plate 22 and the annular body 12 to the inner surface of the tubular body by expanding the diameter using a jack or the like, and is easy to install. Therefore, it consists of several pieces divided into a plurality of members in the circumferential direction. FIG. 4 shows an example of this. One is an example of three divisions and the other is an example of four divisions, but the division members have fixed dimensions s, s ′, t, t ′, one at each end. It has length adjusting parts 31, 32, and has connecting parts 33, 34 at both ends of the divided member.
[0017]
The details of the fixing plate 14 and its connection are as shown in FIG. 5. The split members are connected to each other by abutting the ends, and the connecting portions 33 and 34 are connected by tightening the bolts 35 (FIG. 5 (f)). One adjusting portion 31 having a large number and the other adjusting portion 32 having a long hole are formed into an annular shape, and the fixing plate 14 is sufficiently expanded in diameter by a jack or the like not shown, and the bolts 36 are tightened to join. In joining the overlapping portions of the fixing plate 14 (FIG. 5D), one side of the fixing plate 14 is sloped 40, and the tip portion 42 of the adjustment portion 32 is made thicker than the end portion 43 welded to the fixing plate 14. By reducing the thickness, the adjusting portion 32 is wedge-shaped to improve the frictional joining force, and the arch force against the external force of the fixed plate 14 is increased.
[0018]
By expanding the diameter of the fixing plate 14, the fixing portions 24, 24 of the annular body 12 arranged in advance on the inner surface of the tubular bodies 11, 11 ′ and the external hydraulic resistance plate 22 arranged in the recesses 15, 15 thereof. Can be fixed in pressure contact with the inner surface of the tube body, and at the same time, the seal members 20, 20 are sufficiently pressurized. FIG. 1 illustrates the completed state with no gaps left between the tubular bodies 11 and 11 ′ indicated by phantom lines, the apparatus 10, the recess 15 of the apparatus 10, and the external hydraulic resistance plate 22. However, it is for the sake of convenience, and all are in a pressure contact state. A water-stop ring 29 having a reduced function is inserted between the ends of the tubular bodies 11 and 11 '. The nut 50 is used as a stopper for a diameter-enlarged jack cradle of the fixed plate 14.
[0019]
In the tubular bodies 11 and 11 ′ equipped with the water stop device 10 of the present invention having such a configuration, when the external water pressure is applied to the outside of the annular body 12, the central portion that is most affected is projected as a thick portion. Since the portion 13 is provided, it is possible to counter an external water pressure larger than the conventional one, and since the external hydraulic pressure resistance plate 22 is provided on the inner surface of the annular body 12, even if the annular body 12 receives the external water pressure. It does not bulge inward and does not reduce the flow cross-sectional area or obstruct the internal flow. In addition, the water stop device 10 of the present invention is configured as a low-loss head type by suppressing the protruding amount of the convex portion 13 and providing the bell mouth shape 17 at both ends of the annular body, so that the inside flowing through the pipe body The effect on flow is minimal.
[0020]
【The invention's effect】
Since the present invention is configured as described above, in a water stop device using an annular body, the annular body is not deformed even when an external water pressure is applied, there is no possibility of inhibiting the internal flow, and low loss. Since it functions as a water head type, it is optimal as a water stop device installed in the pipe.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing an embodiment of an external water pressure compatible water stop device according to the present invention.
FIG. 2 is an exploded cross-sectional view showing an enlarged main part.
FIG. 3A is a perspective view of a state in which an external hydraulic resistance plate applied to the present invention is rolled up.
(B) The perspective view of the state expanded similarly.
FIG. 4 is a plan view showing two types of fixing plates.
FIG. 5A is a plan view showing a part of a split member of a fixed plate.
(B) Side view same as above.
(C) The top view of a length adjustment part similarly.
(D) Sectional drawing which similarly shows the joining state in a length adjustment part.
(E) The top view of a connection part similarly.
(F) Sectional drawing which similarly shows the joining state in a connection part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 External water pressure corresponding | compatible water stop apparatus 11, 11 'Tubular body 12 Annular body 13 Convex part 14 as thick part Fixed plate 15 Concave part 20 Seal member 22 External hydraulic pressure resistance plate 23 Central convex part 24 Fixed part 25 Bending part 26 Cutting

Claims

管体の内面に止水目的で配置される、弾性材より成る環状体と、環状体を内方から外方へ加圧して管体の内面に固定するための固定板とを有する止水装置であって、外水圧の作用により環状体が内方へ変形するのを防止するために、環状体の一部に肉厚部を形成するとともに、この肉厚部を外水圧抵抗板によって覆い、固定板の拡径による加圧力によって、外水圧抵抗板を、環状体とともに管体の内面に固定する構成を有し、環状体は、肉厚部として中央部に内向きの凸部を有するとともに、凸部の両側に固定板を装着する凹部を有しており、凸部は外水圧に対抗する変形抵抗力を発揮する角部を両側に有しており、外水圧抵抗板は、環状体の凸部を覆う中央の角部と固定板によって固定される角部より外方の両側の部分に及ぶ、管体軸方向の切れ込みを有しており、それによって環状体への密着性を向上させるようにし、環状体は、凹部に固定板を装着して環状体を管体の内面に固定するときに、固定板が凹部に収まって中央の凸部を覆う外水圧抵抗板とほぼ同一の面をなし、かつまた、環状体の流れ方向の両端部は流水の抵抗の少ないベルマウス状の外面形状として低損失水頭型の構成を有していることを特徴とする外水圧対応型止水装置。A water stop device having an annular body made of an elastic material and disposed on the inner surface of the tube body for water stop, and a fixing plate for pressurizing the annular body from the inside to the outside and fixing it to the inner surface of the tube body Then, in order to prevent the annular body from deforming inward due to the action of external water pressure, a thick part is formed in a part of the annular body, and this thick part is covered with an external hydraulic resistance plate, The external hydraulic resistance plate is fixed to the inner surface of the tubular body together with the annular body by the pressure applied by expanding the diameter of the stationary plate, and the annular body has an inward convex portion at the center as a thick portion. The convex part has a concave part for mounting a fixing plate on both sides, and the convex part has a corner part on both sides that exerts a deformation resistance force against the external water pressure. Tube axis direction that extends to the outer corners of the corners fixed by the fixing plate It has a notch so that the adhesion to the annular body is improved, and when the annular body is fixed to the inner surface of the tubular body by attaching the stationary plate to the recess, the stationary plate is recessed. It has almost the same surface as the external hydraulic pressure resistance plate that covers the central convex part, and both ends in the flow direction of the annular body have a low-loss head type as a bell mouth-like external shape with low resistance to running water. An external water pressure compatible water stop device characterized by having a configuration .

外水圧抵抗板は、周方向に複数部分に分割されたものから成る請求項１又は３記載の外水圧対応型止水装置。The external water pressure-compatible water stop device according to claim 1 or 3, wherein the external water pressure resistor plate is divided into a plurality of parts in the circumferential direction.

固定板は分割構造とし、固定板分割部材の端部の連結部と他端部とはボルト接合とすることで固定板連結部の断面力の向上を図るとともに、分割部材端部の調整部は重ね合わせて接合し、重ね合わせ端部の片方をスロープ加工とし片方を、楔形状としてボルトの摩擦接合力を向上させること特徴とする請求項１記載の外水圧対応型止水装置。The fixing plate has a divided structure, and the connecting portion at the end of the fixing plate dividing member and the other end are bolted to improve the cross-sectional force of the fixing plate connecting portion. The external water pressure responsive water stop device according to claim 1, wherein one of the overlapped end portions is sloped and one is wedged to improve the frictional bonding force of the bolt.

管体の内面の多少の凹凸を補修することなく、弾性材よりなる環状体の装着により確実に止水するために、環状体の止水部に水膨張性のシール部材を装着する請求項１記載の外水圧対応型止水装置。2. A water-expandable seal member is attached to the water stop portion of the annular body in order to ensure water stopping by attaching the annular body made of an elastic material without repairing some irregularities on the inner surface of the tubular body. The external water pressure compatible water stop device as described.