JP2006010713A

JP2006010713A - Hydraulic test apparatus

Info

Publication number: JP2006010713A
Application number: JP2005277338A
Authority: JP
Inventors: Takashi Ueda; 隆司上田; Yoshiki Okamoto; 芳樹岡本; Yuichi Uno; 雄一宇野; Kazuhisa Ogawa; 和久小川; Takashi Sakazaki; 隆志坂崎; Tomoaki Oda; 智秋尾田
Original assignee: Kurimoto Ltd; Togawa Rubber Co Ltd
Current assignee: Kurimoto Ltd; Togawa Rubber Co Ltd
Priority date: 2005-09-26
Filing date: 2005-09-26
Publication date: 2006-01-12
Anticipated expiration: 2022-03-29
Also published as: JP4011081B2

Abstract

<P>PROBLEM TO BE SOLVED: To minimize the size and to increase the test precision. <P>SOLUTION: A hydraulic pressure is applied to the inside of a cylindrical tube 10 to expand its parts 11 and 11 so that a pipe joint part (a) is turned into a sealed space, and the hydraulic pressure is applied to the sealed space for a hydraulic test. Water is surely introduced into the space via a groove type duct 41, and slight displacement between a test apparatus A and the joint part (a) causes no trouble. Both ends 10a of a tube 10 are fixed to side plates 16 of the tube 10 via bolts 25 by metal fittings 24, and displacement between the side plates and the tube ends is prevented. The tube 10 is prevented from warping upward by a fixing ring 51. In this way, troubles due to displacement can be prevented even if the size is reduced. The both side plates 16 are energized in the separating direction from each other by means of a spring 28, and wrinkles in shrinkage of the tube are prevented and damage in movement or the like is reduced. A projection bar 21 around the overall circumference of an expansive part 11 is surely brought into contact with a pipe P inside face for improving a sealing property. A supporting lever 20 of a caster 19 can be rocked, and the caster 19 is positioned by fixing rocking or the like. The caster is fixed by fastening a bolt and a nut. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、地中に埋設する鋳鉄管などの管の継手部を埋め戻す前に水密性能を検査する、特に、中小口径管に有効な水圧試験器に関するものである。 The present invention relates to a water pressure tester that inspects watertight performance before refilling a joint portion of a pipe such as a cast iron pipe buried in the ground, and is particularly effective for a small and medium diameter pipe.

一の管の受口に他の管の挿し口を水密パッキングを介在して順々に挿し込み接合して管路を構築する際、その管路に漏れが生じることは好ましくなく、通常、その漏れは管継手部で生じるため、その管継手部の水密性を試験する必要がある。 When constructing a pipeline by inserting and joining another tube's insertion port in sequence with a watertight packing to the receiving port of one tube, it is not preferable that leakage occurs in that pipeline. Since leakage occurs at the pipe joint, it is necessary to test the water tightness of the pipe joint.

その継手部の水圧試験において、従来、実公昭６０−１５１５５号公報等に記載のように、接合作業後、各継手部位置にテストバンドと称する水圧試験器を持って管内に人が入り、そのバンドを管内面で人力にて押し広げ密着することにより、水圧試験を行ない、接合の不具合による漏水の発見を行なう技術がある。 In the water pressure test of the joint part, as described in Japanese Utility Model Publication No. 60-15155, etc., after joining work, a person enters the pipe with a water pressure tester called a test band at each joint part position. There is a technology that performs water pressure tests by manually spreading and adhering the band on the inner surface of the pipe to detect water leakage due to joint failure.

この人が管路内に入って行う試験は、上記テストバンドを該当する継手部にセットするのに、管内に人が入り、締結ボルトを締め付ける等の作業があるので、管の適用口径は、人が入って作業に支障のない８００ｍｍ以上の場合でしか使用できない。 The test that this person enters into the pipe line is to set the above test band to the corresponding joint part, but there are operations such as entering the pipe and tightening the fastening bolt, so the applicable diameter of the pipe is It can only be used in the case of 800mm or more, where people enter and do not interfere with work.

このため、管内に人が入れない口径７００ｍｍ以下の場合では、一定長さの配管後、その配管（管路）内に充水して各継手部の水圧試験を行なっている。このとき、水圧試験を実施してその配管に漏水が無いことを確認するまでは、管の埋め戻しができない。また、水圧試験前に管の埋め戻しが必要な場合、水圧試験で漏水があった場合、漏水箇所を特定するためには、掘り返して確認しなければならない。 For this reason, in the case of a diameter of 700 mm or less where a person cannot enter the pipe, the pipe (pipe) is filled with water after a certain length of pipe and a water pressure test is performed on each joint. At this time, the pipe cannot be backfilled until a water pressure test is performed and it is confirmed that there is no water leakage in the pipe. Also, if it is necessary to backfill the pipe before the water pressure test, or if there is a water leak in the water pressure test, it must be dug up and confirmed to identify the location of the water leak.

この口径７００ｍｍ以下の管路の構築においても、その管内に人が入ることなく、その継手部の良否を判定することができる水圧試験器として、特開２００１−２７２３００号公報に開示され、図１３に示されるものがある。 Even in the construction of a pipe having a diameter of 700 mm or less, as a water pressure tester capable of determining the quality of the joint without human being entering the pipe, it is disclosed in Japanese Patent Laid-Open No. 2001-272300, and FIG. There is what is shown in.

この水圧試験器Ａは、両側が閉じられた水密な円筒体１０からなり、この円筒体１０は、その筒軸方向一定長さを隔てて全周に亘る膨縮部１１、１１が形成され、その両膨縮部１１、１１間の外面に開口する注水ホース１２及び排気ホース１３が接続されているともに、円筒体１０内に開口する注水ホース１４及び排気ホース１５が接続された構成である。 The water pressure tester A is composed of a watertight cylindrical body 10 that is closed on both sides. The cylindrical body 10 is formed with expansion / contraction portions 11 and 11 over the entire circumference with a certain length in the cylinder axis direction. A water injection hose 12 and an exhaust hose 13 that are open on the outer surface between the expansion / contraction portions 11 and 11 are connected, and a water injection hose 14 and an exhaust hose 15 that are open in the cylindrical body 10 are connected.

例えば、同図に示すように、一方の管Ｐの受口１に他方の管Ｐの挿し口２を水密パッキング３を介在して挿し込んだ後、その管Ｐの一方の開口（管端）から管内に、この水圧試験器Ａを、継手部ａが両膨縮部１１、１１の間に位置するように入れ、上記注水ホース１４から円筒体１０内に注水するとともに排気ホース１５から排気し、十分排気されれば、そのホース１４を閉じてさらに注水し、同図鎖線のごとく、両膨縮部１１、１１を膨張させて管Ｐ内面全周に亘り圧接して継手部ａの両側を水密とする。その後、注水ホース１２から両膨縮部１１、１１間に注水するとともに排気ホース１３から排気し、十分排気されれば、そのホース１３を閉じてさらに注水し、継手部ａの水圧が所定になれば、ホース１２を閉じ、継手部ａ内の所定時間内の水圧変化でもって漏水を検査する。 For example, as shown in the figure, after inserting the insertion port 2 of the other pipe P through the watertight packing 3 into the receiving port 1 of one pipe P, one opening (pipe end) of the pipe P is inserted. The water pressure tester A is inserted into the pipe so that the joint part a is located between the both expansion and contraction parts 11, 11, and water is injected into the cylindrical body 10 from the water injection hose 14 and exhausted from the exhaust hose 15. If exhausted sufficiently, the hose 14 is closed and water is poured, and both expansion / contraction parts 11 and 11 are inflated as shown by chain lines in FIG. Watertight. Thereafter, water is injected between the expansion / contraction portions 11 and 11 from the water injection hose 12 and exhausted from the exhaust hose 13. When exhausted sufficiently, the hose 13 is closed and further water is injected, so that the water pressure at the joint portion a can be predetermined. For example, the hose 12 is closed and water leakage is inspected by a change in water pressure within a predetermined time in the joint part a.

上記円筒体１０は、通常、ゴムチューブ製であって、従来、その中央部と両端部を布などの補強材を埋設した補強層１７とし、両端部に側板１６を嵌めて、鋼製バンド（スチールバンド）１８により締結している。一般に、継手部ａの高水圧試験を行うためには、円筒体１０内にも高水圧を印加して膨縮部１１を管Ｐ内面に強固に圧接して水密化する必要があり、この構成において、円筒体１０内に高水圧を印加すると、図１４に示すように、側板１６の円筒フランジ１６ｂに対し、円筒体１０の端部１０ａがズレる場合がある（ズレ：ｔ）。そのズレｔが生じれば、円筒体１０内から水漏れが生じたり、円筒体１０内の水圧及び継手部ａ内の水圧が変化し、正確な水圧試験が行われないこととなる。 The cylindrical body 10 is usually made of a rubber tube. Conventionally, the central portion and both ends thereof are formed as a reinforcing layer 17 in which a reinforcing material such as cloth is embedded, and side plates 16 are fitted to both ends to form a steel band ( Steel band) 18 is fastened. In general, in order to perform a high water pressure test of the joint portion a, it is necessary to apply a high water pressure also to the cylindrical body 10 so that the expansion / contraction portion 11 is firmly pressed against the inner surface of the pipe P to be watertight. When a high water pressure is applied to the cylindrical body 10, the end 10a of the cylindrical body 10 may be displaced from the cylindrical flange 16b of the side plate 16 as shown in FIG. 14 (deviation: t). If the misalignment t occurs, water leaks from the inside of the cylindrical body 10 or the water pressure in the cylindrical body 10 and the water pressure in the joint portion a change, so that an accurate water pressure test is not performed.

また、円筒体１０に高水圧に耐えるゴムを使用した場合、補強層１７の材質を金属繊維等の高強度のものに変更したり、巻き付け数を多くする必要等がある。その結果、円筒体チューブ１０全体の柔軟性がなくなり、図１５に示すように、検査終了後に水を抜いても、円筒体１０がもとの状態にまで収縮せず、しわｂが寄ったままの状態になる場合がある。 Moreover, when rubber | gum which can endure high water pressure is used for the cylindrical body 10, it is necessary to change the material of the reinforcement layer 17 to a high intensity | strength thing, such as a metal fiber, or to increase the number of windings. As a result, the flexibility of the entire cylindrical tube 10 is lost, and as shown in FIG. 15, the cylindrical body 10 does not shrink to its original state and the wrinkles b remain as shown in FIG. It may become the state of.

さらに、水圧試験器Ａは、図１３に示すように、両膨縮部１１、１１間の中程に継手部ａが位置するようにセットして、継手部ａに十分な水圧を印加する必要があるが、図１６に示すように、そのセットが適切でなく、膨縮部１１がズレて、継手部ａが塞がる場合がある。塞がれば、継手部ａに水圧が適切に印加されず、適正な水圧試験が行われないこととなる。また、補強層１７が劣化すると、同図に示すように、注水ホース１２及び排気ホース１３の開口１２ａ、１３ａも管Ｐ内面に近づき、最悪の場合には接して閉塞され、円滑な注水及び排気を行えなくなる。この補強層１７の劣化は、円筒体１０及び継手部ａの印加水圧が高くなればなる程、激しくなる。 Furthermore, as shown in FIG. 13, the water pressure tester A needs to be set so that the joint part a is located in the middle between the both expansion and contraction parts 11 and 11, and sufficient water pressure must be applied to the joint part a. However, as shown in FIG. 16, the set is not appropriate, the expansion / contraction part 11 may be displaced, and the joint part a may be blocked. If it is blocked, the water pressure is not properly applied to the joint part a, and an appropriate water pressure test is not performed. Further, when the reinforcing layer 17 deteriorates, as shown in the figure, the openings 12a and 13a of the water injection hose 12 and the exhaust hose 13 also approach the inner surface of the pipe P, and in the worst case, they are closed in contact with each other, thereby smooth water injection and exhaust. Cannot be performed. The deterioration of the reinforcing layer 17 becomes more severe as the applied water pressure of the cylindrical body 10 and the joint part a becomes higher.

また、水圧試験器Ａが長いものであると、例えば、図１７に示すように、異形管部分においては、水圧試験器Ａがその異形部分を円滑に進まず、継手部Ａを両膨縮部１１、１１間に位置できない恐れがある。 Further, if the hydraulic tester A is long, for example, as shown in FIG. 17, in the deformed tube portion, the hydraulic tester A does not advance smoothly in the deformed portion, and the joint portion A is connected to the both expansion / contraction portions 11. , 11 may not be located.

さらに、水圧試験器Ａには、両端にキャスター１９を設けて管Ｐ内の移動をスムースに行い得るようにしている。しかし、従来では、図１８に示すように、そのキャスター１９の支持杆（脚）２０を側板１６の円筒フランジ１６ｂにボルト止めしており、そのキャスター１９の突出量調節は、支持杆２０を長孔２０ａを介して矢印のごとく動かすことにより、行っている。この作業は、前後のボルト２０ｂの弛め・締め付けの作業が伴い、煩わしいものとなっている。また、前後のボルト２０ｂの締結位置で、キャスター１９の位置も決定されるため、その両締結位置及び締結度合にキャスター１９の位置精度が左右される。このため、キャスター１９の位置精度が悪く、適正な位置でないと、管Ｐと水圧試験器Ａの軸心が大きく離れ、継手部ａへの均一な水圧印加に支障が生じる。また、軸心がズ
レれば、膨縮部１１全周が管Ｐ内面にぴったり圧接させにくい問題がある。 Furthermore, the water pressure tester A is provided with casters 19 at both ends so that the movement in the pipe P can be performed smoothly. However, conventionally, as shown in FIG. 18, the support rod (leg) 20 of the caster 19 is bolted to the cylindrical flange 16b of the side plate 16, and adjustment of the protrusion amount of the caster 19 makes the support rod 20 long. This is done by moving as shown by the arrow through the hole 20a. This work involves the work of loosening and tightening the front and rear bolts 20b, and is troublesome. Moreover, since the position of the caster 19 is also determined at the fastening position of the front and rear bolts 20b, the positional accuracy of the caster 19 depends on both the fastening position and the fastening degree. For this reason, if the position accuracy of the caster 19 is poor and it is not an appropriate position, the axial centers of the pipe P and the water pressure tester A are greatly separated, and there is a problem in applying uniform water pressure to the joint part a. Further, if the axial center is displaced, there is a problem that the entire circumference of the expansion / contraction part 11 is difficult to be brought into close contact with the inner surface of the pipe P.

この発明は、上記実情に鑑み、例えば、０．５ＭＰａ以上の高水圧試験に耐え得るようにすることを第１の課題、キャスターの位置調整を円滑かつ精度よくし得るようにすることを第２の課題とする。 In view of the above circumstances, the present invention is, for example, a first object to be able to withstand a high water pressure test of 0.5 MPa or more, and a second object to be able to adjust the position of casters smoothly and accurately. It is an issue.

第１の課題を達成するため、この発明は、円筒体の両側をなす膨縮部の端縁全周に筒状固定金具を同一軸上に宛がって接合し、その固定金具を上記円筒体の牢側を閉じる側板の全周のフランジにねじ止めすることとしたのである。 In order to achieve the first object, the present invention is configured to join a cylindrical fixing bracket to the entire circumference of the end edge of the expansion / contraction portion forming both sides of the cylindrical body on the same axis, and connect the fixing bracket to the cylinder. It was decided to screw onto the flange on the entire circumference of the side plate that closes the prison side of the body.

ねじ止めは強固に接合できるため、円筒体内に高水圧が印加されても円筒体と側板のズレが生じにくいからである。膨縮部（円筒体）と固定金具の接合には、接着剤による他、ゴム加硫時に同時焼き付け接着などの手段等を採用し得る。 This is because screwing can be firmly joined, so that even if a high water pressure is applied to the cylindrical body, the cylindrical body and the side plate are not easily displaced. For the joining of the expansion / contraction part (cylindrical body) and the fixing bracket, means such as simultaneous baking adhesion at the time of rubber vulcanization can be adopted in addition to an adhesive.

また、他の手段として、この発明は、上記円筒体の両側を閉じる側板の間にテンションバーを掛け渡し、そのテンションバーには前記両側板を離れる方向に付勢するバネを設けたのである。常時は、そのバネの付勢力により、円筒体（膨縮部）が伸びて縮径した状態であり、円筒体に注水すると（水圧を印加すると）、バネに抗して膨縮部が膨らみ、水圧を除けば、バネの付勢力により復元される。このため、高水圧に耐え得るように膨縮部を高強度のものとしてもしわが生じる恐れはない。 As another means, according to the present invention, a tension bar is stretched between side plates closing both sides of the cylindrical body, and a spring is provided on the tension bar to bias the side plates away from the tension bar. Normally, due to the urging force of the spring, the cylindrical body (expansion / contraction part) is in a state of being expanded and contracted. When water is injected into the cylindrical body (when water pressure is applied), the expansion / contraction part expands against the spring, If water pressure is removed, it is restored by the biasing force of the spring. For this reason, there is no fear that wrinkles will occur even if the expansion / contraction part has a high strength so as to withstand high water pressure.

さらに、他の手段として、この発明は、上記両膨縮部間の外面に開口する注水ホースの開口部から前記膨縮部の間に複数の突起を設け、その突起間で導水路を形成したのである。 Furthermore, as another means, the present invention provides a plurality of projections between an opening portion of the water injection hose that opens to the outer surface between the two expansion / contraction portions, and the expansion / contraction portion, and forms a water conduit between the projections. It is.

この手段においては、仮に、図１６のごとく、膨縮部の劣化や高水圧の印加などにより、注水ホースの開口が管内面に近づいたり、接しても、その開口周りには突起があって導水路が形成されるため、その導水路を通じて継手部には適正な水圧が印加される。また、水圧試験器と継手部がズレて、膨縮部の内側が継手部を塞ぐことがあっても、その膨縮部の内側には突起によって導水路が形成されるため、同様に、その導水路を通じて継手部には適正な水圧が印加される。 In this means, as shown in FIG. 16, even if the opening of the water injection hose approaches or comes into contact with the inner surface of the pipe due to deterioration of the expansion / contraction part or application of high water pressure, there are protrusions around the opening. Since a water channel is formed, an appropriate water pressure is applied to the joint through the water conduit. Also, even if the hydraulic pressure tester and the joint part are misaligned and the inside of the expansion / contraction part may block the joint part, a water conduit is formed by a protrusion inside the expansion / contraction part. Appropriate water pressure is applied to the joint through the water conduit.

このように、導水路が形成されることは、後述のように、膨張しない補強層によって管内面と円筒体の間に空間を必ずしも形成する必要がなくなり、その空間を確実に担保する補強層部分も狭くでき、これにより、円筒体を短くでき、水圧試験器自身の長さを短くし得る。 Thus, the formation of the water conduit is not necessarily required to form a space between the inner surface of the pipe and the cylindrical body by the reinforcing layer that does not expand, as will be described later, and the reinforcing layer portion that reliably secures the space. The cylindrical body can be shortened, and the length of the hydraulic tester itself can be shortened.

また、他の手段として、この発明は、上記膨縮部の端縁を上記円筒体の両側を閉じる側板の全周のフランジに固定し、かつ、その固定部内側端縁の膨縮部外周にその膨縮部を内側に押した状態とする固定リングを嵌めたり、上記膨縮部の端縁全周外面に縮径可能な筒状固定具を嵌めるとともに、膨縮部の端縁全周内面に上記円筒体の両側を閉じる側板の全周の筒状フランジを嵌め、前記固定具の外面にバックルを嵌めて締め付けたのである。 As another means, the present invention fixes the end edge of the expansion / contraction part to the flange on the entire circumference of the side plate closing both sides of the cylindrical body, and the expansion / contraction part outer periphery of the inner end edge of the fixing part. Fit a fixing ring that presses the expansion / contraction part inward, or fit a cylindrical fixture that can be reduced in diameter to the outer peripheral surface of the end edge of the expansion / contraction part. A cylindrical flange on the entire periphery of the side plate that closes both sides of the cylindrical body was fitted, and a buckle was fitted on the outer surface of the fixture and tightened.

膨縮部は一般にゴムなどの弾性体製チューブであり、その端部を内側に押した状態とすると、水平によるそのチューブのめくり上がりが低下する。また、膨縮部を縮径する固定具で圧接すれば、その固定強度は増す。このように、側板と円筒体（膨縮部）の端部の接合強度が高くなれば、円筒体に高水圧が印加されても、側板とチューブのズレは生じにくく、また、その円筒体の長さ方向の接合幅を狭くでき、円筒体の長さも短くし得る。 The expansion / contraction part is generally a tube made of an elastic body such as rubber, and when the end part is pushed inward, the turning-up of the tube due to the horizontal is reduced. In addition, if the expansion / contraction portion is pressed with a fixing tool that reduces the diameter, the fixing strength increases. In this way, if the bonding strength between the side plate and the end of the cylindrical body (expansion / contraction part) is increased, even if a high water pressure is applied to the cylindrical body, the displacement between the side plate and the tube is less likely to occur. The joining width in the length direction can be narrowed, and the length of the cylindrical body can be shortened.

さらに、他の手段として、この発明は、上記両膨縮部にその全周に亘る突条を設けて、この突条が上記管内面に圧接するようにしたのである。膨縮部の表面が圧接する場合に比べれば、その表面から突出した突条が圧接する方が全周に亘って確実になされて水密性は高い。この高い水密性を得られることは、継手部の高水圧試験には適することとなる。 Furthermore, as another means, the present invention is provided with protrusions over the entire circumference of both the expansion and contraction portions so that the protrusions are pressed against the inner surface of the pipe. Compared with the case where the surface of the expansion / contraction part is in pressure contact, the direction in which the protrusion protruding from the surface is in pressure contact is surely made over the entire circumference and the water tightness is high. Obtaining this high water tightness is suitable for the high water pressure test of the joint.

第２の課題を達成するために、この発明は、上記キャスターの支持杆を、上記円筒体に揺動自在に設けるとともに、支持杆に円筒体に設けられたボルトを挿通し、そのボルトに、前記支持杆の内側への揺動を阻止するナットをねじ込み、そのナットのねじ込み位置により、前記支持杆が任意の揺動位置で固定されるようにしたのである。 In order to achieve the second problem, the present invention provides a support rod for the caster so as to be swingable in the cylindrical body, and a bolt provided in the cylindrical body is inserted into the support rod, A nut that prevents the support rod from swinging inward is screwed in, and the support rod is fixed at an arbitrary swing position by the screwing position of the nut.

上記支持杆が任意の揺動角度で固定されれば、支持杆は揺動点が固定のため、その揺動角度によってキャスターの位置が決定される。すなわち、一つの要素によって決定されるため、調整も容易で、精度も高いものとなる。 If the support rod is fixed at an arbitrary swing angle, the swing point of the support rod is fixed, and the position of the caster is determined by the swing angle. That is, since it is determined by one element, adjustment is easy and accuracy is high.

この発明は、以上のように、円筒体のズレをなくしたり、導水路を形成する等により、高水圧に耐え得るものとなるとともに、精度の高い水圧試験を行うことができる。 As described above, the present invention can withstand high water pressure by eliminating the displacement of the cylindrical body or forming a water conduit, and can perform a highly accurate water pressure test.

また、両側板をバネにより離反方向に付勢することにより、円筒体の収縮時にしわが生じることがなく、しわの発生による損傷を防止できる。さらに、導水路を形成すれば、確実に継手部に導水され、仮に、水圧試験器と継手部がズレて、膨縮部の内側が継手部を塞ぐことがあっても支障なく水圧試験を行うことができ、側板と円筒体端の固定を確実にすることと併せて、試験器自体の長さを短くし得る。 Further, by urging both side plates in the direction away from each other by a spring, wrinkles do not occur when the cylindrical body contracts, and damage due to the generation of wrinkles can be prevented. Furthermore, if a water conduit is formed, water is surely guided to the joint part, and even if the hydraulic pressure tester and the joint part are misaligned and the inside of the expansion / contraction part may block the joint part, the water pressure test is performed without any problem. The length of the tester itself can be shortened in conjunction with ensuring the fixing of the side plate and the cylinder end.

また、この発明は、移動用キャスターの位置調節を一要素の変更で行うようにしたので、その作業が容易であるうえに、精度の高いものとすることができる。 Further, according to the present invention, since the position adjustment of the moving caster is performed by changing one element, the operation is easy and the accuracy can be improved.

上記第１の課題を達成するこの発明の一実施形態としては、一方の管の受口に他方の管の挿し口を水密パッキングを介在して挿し込んだ継手部の水圧試験器であり、両側が閉じられた水密な円筒体からなり、この円筒体は、その筒軸方向一定長さを隔てて全周に亘る膨縮部が形成され、その両膨縮部間の外面に開口する注水ホースが接続されているとともに、円筒体内に開口する注水ホースが接続されており、前記管内に、前記継手部が前記両膨縮部の間に位置するように前記円筒体を入れ、前記注水ホースから前記円筒体内に注水して前記両膨縮部を膨張させて管内面全周に亘り圧接して前記継手部の両側を水密とし、上記注水ホースから両膨縮部間に注水する従来公知の水圧試験器において、前記膨縮部が弾性体製チューブからなり、そのチューブの端縁全周に筒状固定金具を同一軸上に宛がって接合し、その固定金具を前記円筒体の両側を閉じる側板の全周のフランジにねじ止めした構成を採用し得る。 One embodiment of the present invention that achieves the first object is a hydraulic tester for a joint part in which an insertion port of the other tube is inserted into a receiving port of one tube with a watertight packing interposed therebetween. The water injection hose is formed of a watertight cylindrical body that is closed, and an expansion / contraction portion is formed over the entire circumference with a certain length in the cylinder axis direction, and is opened to the outer surface between the expansion / contraction portions. And a water injection hose that opens into the cylindrical body is connected, and the cylindrical body is placed in the pipe so that the joint portion is located between the expansion and contraction portions. Conventionally known water pressure that injects water into the cylindrical body, expands both the expansion / contraction portions, presses the entire inner surface of the pipe, water-tightens both sides of the joint portion, and injects water between the expansion / contraction portions from the water injection hose. In the tester, the expansion / contraction part is made of an elastic tube, and A cylindrical fixing bracket the entire circumference edge of the tube joined I is addressed on the same axis may be adopted a configuration in which set screw the mounting brackets to the entire periphery of the flange of the side plates closing both sides of said cylindrical body.

この構成において、円筒体、継手部の排気ホースは、必ずしも設ける必要はないが、従来と同様に、排気ホースを設けることができ、そのとき、継手部側のみとすることもできる。 In this configuration, the exhaust hose of the cylindrical body and the joint portion is not necessarily provided, but an exhaust hose can be provided as in the prior art, and at that time, only the joint portion side can be provided.

他の実施形態としては、上述の従来公知の水圧試験器において、上記膨縮部がゴム製チューブからなり、上記円筒体の両側を閉じる側板の間にテンションバーを掛け渡し、そのテンションバーには前記両側板を離れる方向に付勢するバネを設けた構成を採用し得る。 As another embodiment, in the above-described conventionally known hydraulic pressure tester, the expansion / contraction part is made of a rubber tube, a tension bar is spanned between side plates closing both sides of the cylindrical body, It is possible to adopt a configuration in which a spring that biases in a direction away from both side plates is provided.

この構成において、上記テンションバーの一端は上記円筒体の側面を閉じる側板に水密性をもって移動自在に貫通してナットがねじ込まれ、上記バネは前記側板とテンションバーの止め具の間に介設されているものとすれば、その前記ナットのねじ込み量により、前記側板と止め具の間隔を調整することができる。 In this configuration, one end of the tension bar penetrates the side plate closing the side surface of the cylindrical body movably with water tightness, a nut is screwed, and the spring is interposed between the side plate and the tension bar stopper. If it has, it can adjust the space | interval of the said side plate and a stopper with the screwing amount of the said nut.

さらに、他の実施形態としては、上述の従来公知の水圧試験器において、上記両膨縮部間の外面に開口する注水ホースの開口部から前記膨縮部の間に複数の突起を設け、その突起間で導水路を形成した構成を採用し得る。その突起の形状及び配置態様は、導水路を形成し得るものであれば、いずれでもよく、例えば、上記注水ホースの開口部から上記膨縮部に至る突条を採用できる。 Furthermore, as another embodiment, in the above-described conventionally known hydraulic pressure tester, a plurality of protrusions are provided between the expansion / contraction portions from the opening portion of the water injection hose that opens on the outer surface between the expansion / contraction portions, The structure which formed the water conduit between protrusions can be employ | adopted. The shape and arrangement of the protrusions may be any as long as they can form a water conduit, and for example, a protrusion extending from the opening of the water injection hose to the expansion / contraction part can be employed.

また、他の実施形態としては、上述の従来公知の水圧試験器において、上記膨縮部が弾性体製チューブからなり、そのチューブの端縁を上記円筒体の両側を閉じる側板の全周のフランジに固定し、かつ、その固定部内側端縁のチューブ外周にそのチューブを内側に押した状態とする固定リングを嵌めた構成としたり、そのチューブ製膨縮部の端縁全周外面に縮径可能な筒状固定具を嵌めるとともに、チューブの端縁全周内面に上記円筒体の両側を閉じる側板の全周の筒状フランジを嵌め、前記固定具の外面に締結バンドを嵌めて締め付けた構成を採用し得る。 As another embodiment, in the above-described conventionally known hydraulic pressure tester, the expansion / contraction part is made of an elastic tube, and the flange of the entire side plate of the side plate closes both sides of the cylindrical body at the edges of the tube. To the outer periphery of the tube at the inner edge of the fixing portion, and a fixing ring that presses the tube inward is fitted, or the outer diameter of the entire circumference of the end of the tube expansion / contraction portion is reduced. A configuration in which a cylindrical fixture that can be fitted is fitted, a cylindrical flange of the entire circumference of the side plate that closes both sides of the cylindrical body is fitted to the inner circumference of the end edge of the tube, and a fastening band is fitted to the outer surface of the fixture Can be adopted.

この後者の固定具を嵌めたものにあっては、その筒状固定具を、ゴムなどの弾性体からなるものとすれば、チューブ（膨縮部）とほぼ同質のため、両者がなじむとともに、締結バンドの締め付けによる凹凸をそのゴムが吸収し、固着力が均一化し、全周に亘る水密度も均一化する。 In the case where the latter fixing tool is fitted, if the cylindrical fixing tool is made of an elastic body such as rubber, the tube (expansion / contraction part) is almost the same quality, so both are familiar. The rubber absorbs irregularities caused by tightening of the fastening band, and the fixing force becomes uniform, and the water density over the entire circumference is also made uniform.

そして、さらに他の実施形態としては、上述の従来公知の水圧試験器において、上記両膨縮部にその全周に亘る突条を設けて、この突条が上記管内面に圧接するようにした構成を採用し得る。 As still another embodiment, in the above-described conventionally known hydraulic pressure tester, a protrusion extending over the entire circumference is provided in the both expansion and contraction portions, and the protrusion is pressed against the inner surface of the pipe. A configuration may be employed.

第２の課題を達成する発明の実施形態としては、上述の従来公知の水圧試験器において、上記円筒体の周囲にキャスターを設けて円筒体が移動自在になっており、そのキャスターの支持杆は、前記円筒体に揺動自在に設けられているとともに円筒体に設けられたボルトが挿通し、そのボルトには、前記支持杆の内側への揺動を阻止するナットがねじ込まれており、そのナットのねじ込み位置により、前記支持杆が任意の揺動位置で固定される構成を採用し得る。 As an embodiment of the invention that achieves the second problem, in the above-described conventionally known hydraulic pressure tester, a caster is provided around the cylindrical body so that the cylindrical body is movable, and the support rod of the caster is The bolt provided in the cylindrical body and swingably provided in the cylindrical body is inserted into the bolt, and the nut is screwed into the bolt to prevent the support rod from swinging inward. A configuration in which the support rod is fixed at an arbitrary swinging position by the screwing position of the nut may be employed.

このとき、支持杆の揺動に伴う、支持杆に対するボルトのズレ（ねじれ）は、ボルトが挿通する支持杆の孔を長孔にして、その長孔内のボルトの移動で吸収したり、後述の実施例のごとく、ボルトが挿通するブロック３２の回転で吸収する等の周知な手段を適宜に採用する。 At this time, the displacement (twist) of the bolt with respect to the support rod accompanying the swinging of the support rod is absorbed by the movement of the bolt in the long hole by making the hole of the support rod through which the bolt is inserted into a long hole. As in the embodiment, well-known means such as absorption by rotation of the block 32 through which the bolt is inserted is appropriately adopted.

上記各手段及びその各実施形態は、それぞれ、その二つ、三つ・・・と選択的に併用することができ、その併用したものは、それぞれの作用・効果を発揮し得る。また、膨縮部の拡径度合を適宜に選択することにより、適用管口径も大きいもの、例えば、１口径以上とし得る。 Each of the above means and each embodiment thereof can be selectively used in combination with the two, three, etc., respectively, and the combined use can exhibit the respective actions and effects. Also, by appropriately selecting the degree of expansion of the expansion / contraction part, the applicable pipe diameter can be increased, for example, one or more diameters.

一実施形態を図１乃至図４に示し、従来と同様に、両側が閉じられた水密な耐高圧ゴム製円筒体１０からなり、この円筒体１０は、その筒軸方向一定長さを隔てて全周に亘る膨縮部１１、１１が形成され、その両膨縮部１１、１１間の外面に開口する注水ホース１２及び排気ホース１３が接続されているともに、円筒体１０内に開口する注水ホース１４及び排気ホース１５が接続された構成である。 FIG. 1 to FIG. 4 show an embodiment, which is composed of a watertight high pressure resistant rubber cylindrical body 10 which is closed on both sides as in the prior art, and this cylindrical body 10 is separated by a certain length in the cylinder axis direction. The expansion / contraction portions 11, 11 are formed over the entire circumference, and the water injection hose 12 and the exhaust hose 13 that open to the outer surface between the expansion / contraction portions 11, 11 are connected, and the water injection that opens into the cylindrical body 10. The hose 14 and the exhaust hose 15 are connected.

両膨縮部１１、１１間の円筒体１０には繊維などを混入した補強層１７となっており、図２に示すように、水圧が印加されても、あまり膨張しない。膨縮部１１の中程外周には全周に亘る突条２１が一体成形されている。この突条２１の管Ｐとの当接面はフラットでもよいが、図１２に示すように、全周に亘って襞２１ａを形成したり（図１２（ａ））、全周に亘り一端２１ｂを翼状に斜めに突出させたり（同（ｂ））、全周に亘って突条２１ｃを形成して（同（ｃ））、当接部に柔軟性を持たせたり、当接面積を少なくすることにより、全周に亘って均一な当接性能を確保するとともに、単位面積当たりの面圧を高くするとよい。これにより、後述の円筒体１０内への水圧を極端に高めなくても、突起２１が管Ｐ内面にぴったり圧接して、膨縮部１１の十分な水密性を得ることができる。突起２１
は、その数は任意であり、円筒体１０と一体物でも、貼着、溶着などで接着してもよい。 The cylindrical body 10 between the both expansion / contraction portions 11 and 11 is a reinforcing layer 17 in which fibers and the like are mixed. As shown in FIG. 2, even if water pressure is applied, it does not expand so much. On the middle outer periphery of the expansion / contraction part 11, a protrusion 21 is integrally formed over the entire periphery. The contact surface of the ridge 21 with the pipe P may be flat, but as shown in FIG. 12, a flange 21a is formed over the entire circumference (FIG. 12A), or one end 21b is formed over the entire circumference. Are formed in a wing shape obliquely (same as (b)), and a ridge 21c is formed over the entire circumference (same as (c)), so that the abutting portion is made flexible and the abutting area is reduced. By doing so, it is preferable to ensure uniform contact performance over the entire circumference and to increase the surface pressure per unit area. Thereby, even if it does not raise the water pressure in the below-mentioned cylindrical body 10 extremely, the processus | protrusion 21 can press-contact to the pipe P inner surface exactly, and sufficient watertightness of the expansion / contraction part 11 can be obtained. Protrusion 21
The number may be arbitrary, and may be integrated with the cylindrical body 10 or may be adhered by pasting or welding.

円筒体１０の両側開口を塞ぐ側板１６は、鋼板などで作られ、周縁両側に円筒状のフランジ１６ａ、１６ｂを有しており、その両フランジ１６ａ、１６ｂの外周面に円筒体１０の端部１０ａが嵌まり込んでいる。その両フランジ１６ａ、１６ｂの両者に亘る円筒体端部１０ａ外周面には、繊維などを混入して補強した筒状ゴム２２が嵌められ、このゴム２２の外周に、バックル付の鋼製締結バンド１８が嵌められ、そのバックルでもってバンド１８が縮径されて、補強ゴム２２を介して円筒体１０の端部１０ａがフランジ１６ａ、１６ｂに圧接固定される。このとき、フランジ１６ａ、１６ｂ外周面の全周に亘る溝１６ｃに円筒体１０の端部１０ａが喰い込み、高い止水面圧が得られ、また、その固定もより確実となる（図４参照）。ゴム２２には、繊維などを混入せずに補強しないもの、及びその他の弾性体を採用できる。 The side plate 16 that closes the opening on both sides of the cylindrical body 10 is made of a steel plate or the like, and has cylindrical flanges 16a and 16b on both sides of the periphery, and the end portion of the cylindrical body 10 on the outer peripheral surface of both flanges 16a and 16b. 10a is fitted. A cylindrical rubber 22 reinforced by mixing fibers or the like is fitted on the outer peripheral surface of the cylindrical end 10a extending over both the flanges 16a and 16b, and a steel fastening band with a buckle is fitted on the outer periphery of the rubber 22. 18 is fitted, the band 18 is reduced in diameter by the buckle, and the end portion 10a of the cylindrical body 10 is pressed and fixed to the flanges 16a and 16b via the reinforcing rubber 22. At this time, the end 10a of the cylindrical body 10 bites into the groove 16c extending over the entire outer periphery of the flanges 16a and 16b, a high water stop surface pressure is obtained, and the fixing thereof is more reliable (see FIG. 4). . As the rubber 22, a material that does not reinforce without mixing fibers and the like, and other elastic bodies can be adopted.

円筒体１０の端には、図３に示すように、円筒状固定金具２４が接着剤により接合固定されており、その固定金具２４をボルト・ナット２５によりフランジ１６ｂに締結することにより、円筒体１０の端が側板１６に強固に固定される。これにより、円筒体１０内に高水圧が印加されても、例えば、０．５ＭＰａ以上の水圧が印加されても、側板１６に対し円筒体１０がズレることはない。 As shown in FIG. 3, a cylindrical fixing bracket 24 is joined and fixed to the end of the cylindrical body 10 with an adhesive, and the fixing bracket 24 is fastened to the flange 16b with bolts and nuts 25. The ten ends are firmly fixed to the side plate 16. Thereby, even if a high water pressure is applied in the cylindrical body 10, for example, a water pressure of 0.5 MPa or more is applied, the cylindrical body 10 is not displaced from the side plate 16.

両側板１６、１６にはテンションバー２６が貫通し、その端にはナット２７がねじ込まれている。また、円筒体１０内のテンションバー２６にはコイルバネ２８が嵌挿され、このバネ２８は、テンションバー２６に固定の止め具２６ａと、側板１６の間に位置し、圧縮状態で、円筒体１０と側板１６が固定され、常時は、その付勢力により、円筒体１０を伸長させる。ナット２７のねじ込み度合によって、バネ２８の付勢力は適宜に選定する。止め具２６ａをねじ込みナット構造とし、このナット（止め具２６ａ）のねじ込み位置で、バネ２８の付勢力を調整するようにもし得る。 A tension bar 26 passes through the side plates 16 and 16, and nuts 27 are screwed into the ends thereof. In addition, a coil spring 28 is fitted into the tension bar 26 in the cylindrical body 10, and the spring 28 is positioned between the stopper 26 a fixed to the tension bar 26 and the side plate 16, and in a compressed state, the cylindrical body 10. The side plate 16 is fixed, and the cylindrical body 10 is normally extended by the biasing force. The urging force of the spring 28 is appropriately selected according to the screwing degree of the nut 27. The stopper 26a may have a screw nut structure, and the urging force of the spring 28 may be adjusted at the screw position of the nut (stopper 26a).

側板１６の外側フランジ１６ｂの内側周囲４等分位には、支持杆２０を介してキャスター１９が設けられている。キャスター１９の位置は、３等分位などと任意である。その支持杆２０は、図４に示すように、ピン３１でもってフランジ１６ｂの径方向に揺動自在となっており、その側面のブロック３２にフランジ１６ｂに立設したボルト３３が貫通している。そのブロック１６は支持杆２０に回転自在に嵌まり込んでおり、支持杆２０の揺動に対するボルト３３の相対変位を、そのブロック１６が嵌合点周りに回転して吸収する。またブロック３２の両側にはボルト３３にねじ込んだナット３４が圧接しており、同図の実線から鎖線のごとく、支持杆２０を任意の揺動角度にしてキャスター１９の突出度合を調整した後、その両ナット３４を締結することにより、その位置を固定する。 A caster 19 is provided via a support rod 20 in the inner circumference of the outer flange 16 b of the side plate 16 in the fourth quarter. The position of the caster 19 is arbitrary, such as a quartile. As shown in FIG. 4, the support rod 20 is swingable in the radial direction of the flange 16b with a pin 31, and a bolt 33 erected on the flange 16b passes through a block 32 on the side surface. . The block 16 is rotatably fitted to the support rod 20, and the block 16 rotates around the fitting point to absorb the relative displacement of the bolt 33 with respect to the swinging of the support rod 20. Further, nuts 34 screwed into bolts 33 are pressed against both sides of the block 32, and after adjusting the protrusion degree of the caster 19 by making the support rod 20 an arbitrary swing angle as shown by a chain line from the solid line in FIG. By fastening the nuts 34, the position is fixed.

側板１６には、従来と同様に、移動用竿（挿入用ロッド）３０をクランプ等により取付け可能となっている。この竿３０は継ぎ足し可能で、管Ｐのほぼ長さ分、継ぎ足しされる。例えば、竿３０の長さを１．０〜１．５ｍとすれば、管Ｐが５〜６ｍであれば、４、５本を継ぎ足すこととなる。 As in the prior art, a moving rod (insertion rod) 30 can be attached to the side plate 16 with a clamp or the like. This hook 30 can be added, and is added by the length of the pipe P. For example, if the length of the collar 30 is 1.0 to 1.5 m, then 4 or 5 pipes are added if the pipe P is 5 to 6 m.

この実施例は、以上の構成であり、つぎにその作用を説明すると、先行きの (一の）管Ｐの受口１に後行きの (他の）管Ｐの挿し口２を水密パッキング３を介在して接合した後、図１に示すように、後行きの管Ｐの受口１側から、この水圧試験器Ａを管内に挿入して、両膨縮部１１、１１間に継手部ａが位置した状態にする。このとき、キャスター１９は管Ｐと水圧試験器Ａがほぼ同一軸心となるように調整し、水圧試験器Ａは竿３０でもって挿し込む。 This embodiment has the above-described configuration. Next, its operation will be described. The insertion port 2 of the subsequent (other) pipe P is connected to the insertion port 2 of the subsequent (other) pipe P and the watertight packing 3 is installed. After intervening and joining, as shown in FIG. 1, the hydraulic pressure tester A is inserted into the pipe from the receiving port 1 side of the backward pipe P, and the joint part a is connected between the expansion / contraction parts 11, 11. Is in the position. At this time, the caster 19 is adjusted so that the pipe P and the water pressure tester A have substantially the same axial center, and the water pressure tester A is inserted with the rod 30.

この状態で、図２に示すように、注水ホース１４から円筒体１０内に注水して円筒体１０（膨縮部１１）を膨張させ、その膨縮部１１、１１を管Ｐ内面に圧接する。これにより、継手部ａは密封空間となり、排気ホース１５は適宜に図示しないバルブにより閉じ、円筒体１０内が規定の水圧になれば、図示しないバルブを閉じてその水圧を保持する。このとき、図２鎖線で示すように、円筒体１０の排気口１５ａは上方に延ばして、円滑に排気し得るようにするとよい。 In this state, as shown in FIG. 2, water is injected from the water injection hose 14 into the cylindrical body 10 to expand the cylindrical body 10 (expanded / contracted portion 11), and the expanded / contracted portions 11, 11 are pressed against the inner surface of the pipe P. . As a result, the joint portion a becomes a sealed space, and the exhaust hose 15 is appropriately closed by a valve (not shown). When the inside of the cylindrical body 10 reaches a specified water pressure, the valve (not shown) is closed and the water pressure is maintained. At this time, as shown by a chain line in FIG. 2, the exhaust port 15a of the cylindrical body 10 is preferably extended upward so that it can be exhausted smoothly.

この後、継手部ａの密封空間に注入ホース１２から注水する。このとき、密封空間内の空気は排気ホース１３から排気され、十分に排気されれば、図示しないバルブにより排気ホース１３を閉じる。注水ホース１２からは、密封空間（継手部ａ）内が規定の水圧になるまで注水し、規定の水圧、例えば、０．５ＭＰａになれば、図示しないバルブにより注入ホース１２を閉じて、密封空間内を規定の水圧に維持する。因みに、注水ホース１２からの継手部ａ内への注水は、その注水口１２ａから下方に流れて下部から充水されるため、排気口１３ａからは円滑に排気し得る。また、確実に排気するには、図２鎖線で示すように、排気口１３ａからさらに受口１内面近くに至るホース１３ｂを設けるとよい。このとき、そのホース１３ｂは可撓性があって、水圧試験器Ａの移動に支障がないようにするとよい。 Thereafter, water is poured from the injection hose 12 into the sealed space of the joint part a. At this time, the air in the sealed space is exhausted from the exhaust hose 13, and if exhausted sufficiently, the exhaust hose 13 is closed by a valve (not shown). Water is injected from the water injection hose 12 until the inside of the sealed space (joint portion a) reaches a specified water pressure. When the water pressure reaches a specified water pressure, for example, 0.5 MPa, the injection hose 12 is closed by a valve (not shown), The inside is maintained at the specified water pressure. Incidentally, since the water injection from the water injection hose 12 into the joint part a flows downward from the water injection port 12a and is filled from the lower part, it can be smoothly exhausted from the exhaust port 13a. Moreover, in order to exhaust reliably, it is good to provide the hose 13b from the exhaust port 13a to near the inner surface of the receiving port 1 as shown by a chain line in FIG. At this time, the hose 13b should be flexible so as not to hinder the movement of the hydraulic pressure tester A.

この維持時間を規定し、その規定維持時間内における密封空間内の水圧低下によって水密パッキング３の不良、すなわち漏れ状態を検査する。検査が終われば、各水圧ホース１２、１３、１４、１５から水を排出して、円筒体１０を収縮させるとともに、継手部ａから水を排出する。このとき、バネ２８により、その円筒体１０の収縮（伸長）は確実になされて、しわｂがよることはない。つづいて、この水圧試験器Ａを管Ｐ外に導き出す。 The maintenance time is defined, and the defectiveness of the watertight packing 3, that is, the leakage state is inspected by the decrease in the water pressure in the sealed space within the specified maintenance time. When the inspection is completed, water is discharged from each of the hydraulic hoses 12, 13, 14, and 15 to contract the cylindrical body 10 and discharge water from the joint portion a. At this time, the contraction (extension) of the cylindrical body 10 is surely performed by the spring 28, and the wrinkle b is not caused. Subsequently, the water pressure tester A is led out of the pipe P.

漏水が生じておれば、継手部Ａの再挿入や水密パッキング３の取替えを行い、生じていなければ、次の管Ｐを接続し、その継手部ａの水圧検査に移行する。なお、継手部ａの検査は、一の管Ｐの接続毎に行ってもよいが、任意の数の管Ｐを接続後、この水圧試験器Ａを入れて、その全ての継手部ａを順々に水圧試験してもよい。 If water leakage has occurred, the joint portion A is reinserted or the watertight packing 3 is replaced. If not, the next pipe P is connected and the water pressure inspection of the joint portion a is performed. The joint part a may be inspected every time one pipe P is connected, but after connecting any number of pipes P, the hydraulic pressure tester A is inserted, and all the joint parts a are sequentially tested. You may test the water pressure separately.

図５乃至図９には他の実施例を示し、この実施例は、円筒体１０の中央部に補強層１７を形成せず、注水ホース１２及び排気ホース１３の注水口１２ａ、排気口１３ａから膨縮部１１に亘って、導水路４１を形成したものである。その導水路４１は、図６、図７に示すように、周方向の所要幅に亘って突条４２を設けて形成したり、図９に示すように突起４３を設けて形成することができる。その突条４２、突起４３は、図６、図７及び図９に示すように、円筒体１０と一体成形により設けてもよいが、図８に示すように別物４４を接着することにより、設けてもよい。 FIG. 5 to FIG. 9 show another embodiment. This embodiment does not form the reinforcing layer 17 in the central portion of the cylindrical body 10, and from the water inlet 12a and the exhaust outlet 13a of the water injection hose 12 and the exhaust hose 13. A water conduit 41 is formed across the expansion / contraction part 11. As shown in FIGS. 6 and 7, the water conduit 41 can be formed by providing protrusions 42 over a required width in the circumferential direction, or by providing protrusions 43 as shown in FIG. 9. . The protrusions 42 and protrusions 43 may be provided integrally with the cylindrical body 10 as shown in FIGS. 6, 7 and 9, but are provided by bonding a separate object 44 as shown in FIG. 8. May be.

この実施例は、図５鎖線のごとく、円筒体１０の注水により、その中央部が膨出して、注水孔１２ａ及び排気口１３ａが管Ｐ内面に近接して継手部ａを閉塞する恐れがあるが、突起４２による導水路４１の形成により、注水孔１２ａ、排気孔１３ａから継手部ａ内への通路は確保されてスムースに注水及び排気がなされる。また、図１６のように、継手部ａと水圧試験器Ａの位置がズレて（図５鎖線参照）、その導水路４１の部分で継手部ａを塞いでも、同様に、その導水路４１を通して継手部ａにスムースに注水される。この実施例でも、両膨縮部１１、１１間に補強層１７を形成できる。 In this embodiment, as shown by a chain line in FIG. 5, the center portion of the cylindrical body 10 swells, and the water injection hole 12a and the exhaust port 13a may be close to the inner surface of the pipe P to close the joint portion a. However, the formation of the water guide passage 41 by the protrusion 42 ensures a passage from the water injection hole 12a and the exhaust hole 13a into the joint portion a, so that water is smoothly injected and exhausted. Further, as shown in FIG. 16, even if the joint part a and the hydraulic pressure tester A are misaligned (see the chain line in FIG. 5) and the joint part a is blocked by the water conduit 41, similarly, Water is smoothly poured into the joint a. Also in this embodiment, the reinforcing layer 17 can be formed between the both expanded and contracted portions 11 and 11.

図１０にはさらに他の実施例を示し、この実施例は、側板１６のフランジ１６ａ、１６ｂの幅を小さくして、水圧試験器Ａの長さを短くしたものであり、フランジ１６ｂの端縁の円筒体１０の外周に固定リング５１を嵌めて、その円筒体１０の端縁１０ａが少し内側に押された状態としたものである。この押された状態であると、同図鎖線のごとく、円筒体１０が膨張した際、フランジ１６ｂ（側板１６）端縁から円筒体１０がめくり上がることがなくなる。このため、図示のごとく、フランジ１６ａを省略するなどにより、水圧試験器Ａの長さを極力短くできる。 FIG. 10 shows still another embodiment, in which the width of the flanges 16a and 16b of the side plate 16 is reduced and the length of the hydraulic pressure tester A is shortened. The fixing ring 51 is fitted to the outer periphery of the cylindrical body 10 so that the end edge 10a of the cylindrical body 10 is pushed slightly inward. In this pushed state, the cylindrical body 10 does not turn up from the edge of the flange 16b (side plate 16) when the cylindrical body 10 expands as indicated by a chain line in FIG. For this reason, as shown in the figure, the length of the hydraulic pressure tester A can be shortened as much as possible by omitting the flange 16a.

また、この実施例は、注水孔１２ａ近傍の補強層１７がなく、導水路４１で、注水孔１２ａ、排気孔１３ａからの注水及び排気をスムースにしたので、膨縮部１１、１１間を短くすることができ、これによっても、水圧試験器Ａの長さを短くできる。このように、短くできることにより、図１１に示すように、異形管部分の継手部ａにおいても、両膨縮部１１、１１間に継手部ａを円滑に位置させることができる。 Further, in this embodiment, the reinforcing layer 17 in the vicinity of the water injection hole 12a is not provided, and water injection and exhaust from the water injection hole 12a and the exhaust hole 13a are made smooth in the water conduit 41. This can also shorten the length of the water pressure tester A. Thus, by being able to shorten, as shown in FIG. 11, also in the joint part a of a deformed pipe part, the joint part a can be smoothly located between the both expansion / contraction parts 11 and 11. FIG.

これらの実施例のように、注水口１２ａ部分に補強層１７のないものにあっては、円筒体１０内の水圧は、膨縮部１１の拡径にその殆どが作用して円滑な水密性を担保できる。 As in these embodiments, in the case where there is no reinforcing layer 17 in the water inlet 12a, most of the water pressure in the cylindrical body 10 acts on the diameter expansion of the expansion / contraction part 11 and smooth watertightness. Can be secured.

上記円筒体１０の補強層１７の部分は、鉄板、樹脂板などの円筒で構成することもできる。また、各実施例は、ダクタイル鋳鉄管のＳ形管継手の場合であったが、この発明は、同Ｋ形、Ａ形、Ｕ形、Ｔ形、ＵＳ形、ＫＦ形、ＵＦ形、ＮＳ形、ＳII形などの各種の継手形式に適用し得ることは勿論であり、塩ビ管等のゴムパッキンを使用する各種の継手形式であっても適用し得る。さらに、テンションバー２６をその途中に自在継手を介設する等により折曲自在とすれば、円筒体１０も折曲可能となって、異形管部分などの屈曲部の通行及び膨縮部１１の圧接が容易となる。 The portion of the reinforcing layer 17 of the cylindrical body 10 can be formed of a cylinder such as an iron plate or a resin plate. In addition, each example was a case of an S-shaped pipe joint of a ductile cast iron pipe, but the present invention is the same K-type, A-type, U-type, T-type, US-type, KF-type, UF-type, NS-type. Of course, the present invention can be applied to various types of joints such as the SII type, and can also be applied to various types of joints using rubber packing such as polyvinyl chloride pipes. Further, if the tension bar 26 can be bent by inserting a universal joint in the middle of the tension bar 26, the cylindrical body 10 can also be bent, and the passage of the bent portion such as the deformed pipe portion and the expansion / contraction portion 11 can be performed. Pressure welding is easy.

一実施例の作用断面図Operational sectional view of one embodiment 同実施例の作用断面図Working sectional view of the embodiment 図１の要部拡大図1 is an enlarged view of the main part of FIG. 図１の要部拡大図1 is an enlarged view of the main part of FIG. 他の実施例の作用断面図Operational sectional view of another embodiment （ａ）は同実施例の斜視図、（ｂ）は同平面図(A) is the perspective view of the same Example, (b) is the top view 同実施例の作用説明用切断側面図Cut side view for explaining the operation of the embodiment 他の実施例を示し、（ａ）は平面図、（ｂ）は（ａ）の要部切断正面図Another embodiment is shown, (a) is a plan view, (b) is a cut front view of the main part of (a) 他の実施例の要部斜視図The principal part perspective view of another Example 他の実施例の一部切断正面図Partial cut front view of another embodiment 同実施例の作用図Operational diagram of this embodiment 膨縮部突起の各例の要部断面図Main part sectional view of each example of expansion / contraction part projection 従来例の作用断面図Cross-sectional view of the conventional example 従来例の作用断面図Cross-sectional view of the conventional example 従来例の作用断面図Cross-sectional view of the conventional example 従来例の作用断面図Cross-sectional view of the conventional example 従来例の作用断面図Cross-sectional view of the conventional example 従来例の要部断面図Cross section of the main part of the conventional example

符号の説明Explanation of symbols

Ａ水圧試験器
Ｐ管
ａ継手部
１受口
２挿し口
３水密パッキング
１０円筒体（ゴムチューブ）
１０ａ円筒体端部
１１膨縮部
１２、１４注水ホース
１３、１５排気ホース
１６側板
１６ａ、１６ｂ側板フランジ
１７補強層
１８締結バンド
１９キャスター
２０キャスター支持杆
２１膨縮部の突条
２２補強ゴム
２４固定金具
２５ボルト
２６テンションバー
２７ナット
２８バネ
３０移動竿
３１揺動ピン
３２ブロック
３３調節ボルト
３４ナット
４１導水路
４２突条
４３突起
５１固定リング A Water pressure tester P Pipe a Joint part 1 Receiving port 2 Inserting port 3 Watertight packing 10 Cylindrical body (rubber tube)
10a Cylindrical end part 11 Expansion / contraction part 12, 14 Water injection hose 13, 15 Exhaust hose 16 Side plate 16a, 16b Side plate flange 17 Reinforcement layer 18 Fastening band 19 Caster 20 Caster support rod 21 Ridge 22 of expansion / contraction part Reinforcement rubber 24 Fixation Metal fitting 25 Bolt 26 Tension bar 27 Nut 28 Spring 30 Moving rod 31 Oscillating pin 32 Block 33 Adjustment bolt 34 Nut 41 Water conduit 42 Projection 43 Projection 51 Fixing ring

Claims

一方の管Ｐの受口１に他方の管Ｐの挿し口２を水密パッキング３を介在して挿し込んだ継手部ａの水圧試験器Ａであり、
両側が閉じられた水密な円筒体１０からなり、この円筒体１０は、その筒軸方向一定長さを隔てて全周に亘る膨縮部１１、１１が形成され、その両膨縮部１１、１１間の外面に開口する注水ホース１２が接続されているとともに、円筒体１０内に開口する注水ホース１４が接続されており、
上記管Ｐ内に、上記継手部ａが上記両膨縮部１１、１１の間に位置するように上記円筒体１０を入れ、上記注水ホース１４から前記円筒体１０内に注水して前記両膨縮部１１、１１を膨張させて管Ｐ内面全周に亘り圧接して前記継手部ａの両側を水密とし、上記注水ホース１２から両膨縮部１１、１１間に注水する水圧試験器Ａにおいて、
上記膨縮部１１が弾性体製チューブからなり、そのチューブ１１の端縁全周に筒状固定金具２４を同一軸上に宛がって接合し、その固定金具２４を上記円筒体１０の両側を閉じる側板１６の全周のフランジ１６ｂにねじ止めしたことを特徴とする水圧試験器。 A water pressure tester A of a joint portion a in which the insertion port 2 of the other tube P is inserted into the receiving port 1 of the one tube P through the watertight packing 3,
It consists of a watertight cylindrical body 10 closed on both sides, and this cylindrical body 10 is formed with expansion / contraction portions 11, 11 over the entire circumference with a certain length in the cylinder axis direction. The water injection hose 12 that opens to the outer surface between 11 is connected, and the water injection hose 14 that opens into the cylindrical body 10 is connected,
The cylindrical body 10 is placed in the pipe P so that the joint portion a is located between the expansion / contraction portions 11, 11, and water is injected into the cylindrical body 10 from the water injection hose 14, thereby In the hydraulic pressure tester A in which the contraction portions 11 and 11 are expanded and pressed against the entire inner surface of the pipe P to make both sides of the joint portion a watertight, and water is injected between the expansion and contraction portions 11 and 11 from the water injection hose 12. ,
The expansion / contraction portion 11 is made of an elastic tube, and a cylindrical fixture 24 is joined to the entire circumference of the tube 11 on the same axis, and the fixture 24 is connected to both sides of the cylindrical body 10. The water pressure tester is characterized in that it is screwed to the flange 16b of the entire circumference of the side plate 16 that closes the side plate.

一方の管Ｐの受口１に他方の管Ｐの挿し口２を水密パッキング３を介在して挿し込んだ継手部ａの水圧試験器Ａであり、
両側が閉じられた水密な円筒体１０からなり、この円筒体１０は、その筒軸方向一定長さを隔てて全周に亘る膨縮部１１、１１が形成され、その両膨縮部１１、１１間の外面に開口する注水ホース１２が接続されているとともに、円筒体１０内に開口する注水ホース１４が接続されており、
上記管Ｐ内に、上記継手部ａが上記両膨縮部１１、１１の間に位置するように上記円筒体１０を入れ、上記注水ホース１４から前記円筒体１０内に注水して前記両膨縮部１１、１１を膨張させて管Ｐ内面全周に亘り圧接して前記継手部ａの両側を水密とし、上記注水ホース１２から両膨縮部１１、１１間に注水する水圧試験器Ａにおいて、
上記膨縮部１１が弾性体製チューブからなり、上記円筒体１０の両側を閉じる側板１６の間にテンションバー２６を掛け渡し、そのテンションバー２６には前記両側板１６を離れる方向に付勢するバネ２８を設けたことを特徴とする水圧試験器。 A water pressure tester A of a joint portion a in which the insertion port 2 of the other tube P is inserted into the receiving port 1 of the one tube P through the watertight packing 3,
It consists of a watertight cylindrical body 10 closed on both sides, and this cylindrical body 10 is formed with expansion / contraction portions 11, 11 over the entire circumference with a certain length in the cylinder axis direction. The water injection hose 12 that opens to the outer surface between 11 is connected, and the water injection hose 14 that opens into the cylindrical body 10 is connected,
The cylindrical body 10 is placed in the pipe P so that the joint portion a is located between the expansion / contraction portions 11, 11, and water is injected into the cylindrical body 10 from the water injection hose 14, thereby In the hydraulic pressure tester A in which the contraction portions 11 and 11 are expanded and pressed against the entire inner surface of the pipe P to make both sides of the joint portion a watertight, and water is injected between the expansion and contraction portions 11 and 11 from the water injection hose 12. ,
The expansion / contraction part 11 is made of an elastic tube, and a tension bar 26 is stretched between side plates 16 that close both sides of the cylindrical body 10, and the tension bar 26 is urged in a direction away from the side plates 16. A water pressure tester characterized in that a spring 28 is provided.

上記テンションバー２６の一端は上記円筒体１０の側面を閉じる側板１６に水密性をもって移動自在に貫通してナット２７がねじ込まれ、上記バネは前記側板とテンションバー２６の止め具２６ａの間に介設され、前記ナット２７のねじ込み量により、前記側板１６と止め具２６ａの間隔が調整されることを特徴とする請求項２に記載の水圧試験器。 One end of the tension bar 26 penetrates the side plate 16 that closes the side surface of the cylindrical body 10 in a watertight manner so that the nut 27 is screwed, and the spring is interposed between the side plate and the stopper 26 a of the tension bar 26. The hydraulic pressure tester according to claim 2, wherein an interval between the side plate 16 and the stopper 26 a is adjusted by an amount of screwing of the nut 27.

一方の管Ｐの受口１に他方の管Ｐの挿し口２を水密パッキング３を介在して挿し込んだ継手部ａの水圧試験器Ａであり、
両側が閉じられた水密な円筒体１０からなり、この円筒体１０は、その筒軸方向一定長さを隔てて全周に亘る膨縮部１１、１１が形成され、その両膨縮部１１、１１間の外面に開口する注水ホース１２が接続されているとともに、円筒体１０内に開口する注水ホース１４が接続されており、
上記管Ｐ内に、上記継手部ａが上記両膨縮部１１、１１の間に位置するように上記円筒体１０を入れ、上記注水ホース１４から前記円筒体１０内に注水して前記両膨縮部１１、１１を膨張させて管Ｐ内面全周に亘り圧接して前記継手部ａの両側を水密とし、上記注水ホース１２から両膨縮部１１、１１間に注水する水圧試験器Ａにおいて、
上記膨縮部１１が弾性体製チューブからなり、そのチューブ１１の端縁を上記円筒体１０の両側を閉じる側板１６の全周のフランジに固定し、かつ、その固定部内側端縁のチューブ１１外周にそのチューブ１１を内側に押した状態とする固定リング５１を嵌めたことを特徴とする水圧試験器。 A water pressure tester A for a joint portion a in which the insertion port 2 of the other tube P is inserted into the receiving port 1 of the one tube P through the watertight packing 3,
It consists of a watertight cylindrical body 10 closed on both sides, and this cylindrical body 10 is formed with expansion / contraction portions 11, 11 over the entire circumference with a certain length in the cylinder axis direction. The water injection hose 12 that opens to the outer surface between 11 is connected, and the water injection hose 14 that opens into the cylindrical body 10 is connected,
The cylindrical body 10 is placed in the pipe P so that the joint portion a is located between the expansion / contraction portions 11, 11, and water is injected into the cylindrical body 10 from the water injection hose 14, thereby In the hydraulic pressure tester A in which the contraction portions 11 and 11 are expanded and pressed against the entire inner surface of the pipe P to make both sides of the joint portion a watertight, and water is injected between the expansion and contraction portions 11 and 11 from the water injection hose 12. ,
The expansion / contraction part 11 is made of an elastic tube, the end of the tube 11 is fixed to the flange on the entire circumference of the side plate 16 that closes both sides of the cylindrical body 10, and the tube 11 at the inner end of the fixing part is fixed. A water pressure tester characterized in that a fixing ring 51 is placed on the outer periphery so as to push the tube 11 inward.

一方の管Ｐの受口１に他方の管Ｐの挿し口２を水密パッキング３を介在して挿し込んだ継手部ａの水圧試験器Ａであり、
両側が閉じられた水密な円筒体１０からなり、この円筒体１０は、その筒軸方向一定長さを隔てて全周に亘る膨縮部１１、１１が形成され、その両膨縮部１１、１１間の外面に開口する注水ホース１２が接続されているとともに、円筒体１０内に開口する注水ホース１４が接続されており、
上記管Ｐ内に、上記継手部ａが上記両膨縮部１１、１１の間に位置するように上記円筒体１０を入れ、上記注水ホース１４から前記円筒体１０内に注水して前記両膨縮部１１、１１を膨張させて管Ｐ内面全周に亘り圧接して前記継手部ａの両側を水密とし、上記注水ホース１２から両膨縮部１１、１１間に注水する水圧試験器Ａにおいて、
上記両膨縮部１１、１１間の外面に開口する注水ホース１２の開口部から前記膨縮部１１の間に複数の突起４２、４３を設け、その突起間で導水路４１を形成したことを特徴とする水圧試験器。 A water pressure tester A of a joint portion a in which the insertion port 2 of the other tube P is inserted into the receiving port 1 of the one tube P through the watertight packing 3,
It consists of a watertight cylindrical body 10 closed on both sides, and this cylindrical body 10 is formed with expansion / contraction portions 11, 11 over the entire circumference with a certain length in the cylinder axis direction. The water injection hose 12 that opens to the outer surface between 11 is connected, and the water injection hose 14 that opens into the cylindrical body 10 is connected,
The cylindrical body 10 is placed in the pipe P so that the joint portion a is located between the expansion / contraction portions 11, 11, and water is injected into the cylindrical body 10 from the water injection hose 14, thereby In the hydraulic pressure tester A in which the contraction portions 11 and 11 are expanded and pressed against the entire inner surface of the pipe P to make both sides of the joint portion a watertight, and water is injected between the expansion and contraction portions 11 and 11 from the water injection hose 12. ,
A plurality of projections 42 and 43 are provided between the expansion and contraction portion 11 from the opening portion of the water injection hose 12 that opens to the outer surface between the both expansion and contraction portions 11 and 11, and the water conduit 41 is formed between the projections. A water pressure tester.

上記突起４２が、上記注水ホース１２の開口部から上記膨縮部１１に至る突条からなることを特徴とする請求項５に記載の水圧試験器。 The water pressure tester according to claim 5, wherein the protrusion is a protrusion extending from the opening of the water injection hose 12 to the expansion / contraction part 11.

一方の管Ｐの受口１に他方の管Ｐの挿し口２を水密パッキング３を介在して挿し込んだ継手部ａの水圧試験器Ａであり、
両側が閉じられた水密な円筒体１０からなり、この円筒体１０は、その筒軸方向一定長さを隔てて全周に亘る膨縮部１１、１１が形成され、その両膨縮部１１、１１間の外面に開口する注水ホース１２が接続されているとともに、円筒体１０内に開口する注水ホース１４が接続されており、
上記管Ｐ内に、上記継手部ａが上記両膨縮部１１、１１の間に位置するように上記円筒体１０を入れ、上記注水ホース１４から前記円筒体１０内に注水して前記両膨縮部１１、１１を膨張させて管Ｐ内面全周に亘り圧接して前記継手部ａの両側を水密とし、上記注水ホース１２から両膨縮部１１、１１間に注水する水圧試験器Ａにおいて、
上記両膨縮部１１にその全周に亘る突条２１を設けて、この突条２１が上記管Ｐ内面に圧接するようにしたことを特徴とする水圧試験器。 A water pressure tester A of a joint portion a in which the insertion port 2 of the other tube P is inserted into the receiving port 1 of the one tube P through the watertight packing 3,
It consists of a watertight cylindrical body 10 closed on both sides, and this cylindrical body 10 is formed with expansion / contraction portions 11, 11 over the entire circumference with a certain length in the cylinder axis direction. The water injection hose 12 that opens to the outer surface between 11 is connected, and the water injection hose 14 that opens into the cylindrical body 10 is connected,
The cylindrical body 10 is placed in the pipe P so that the joint portion a is located between the expansion / contraction portions 11, 11, and water is injected into the cylindrical body 10 from the water injection hose 14, thereby In the hydraulic pressure tester A in which the contraction portions 11 and 11 are expanded and pressed against the entire inner surface of the pipe P to make both sides of the joint portion a watertight, and water is injected between the expansion and contraction portions 11 and 11 from the water injection hose 12. ,
A water pressure tester characterized in that a protrusion 21 is provided over the entire circumference of each of the expansion / contraction portions 11 so that the protrusion 21 is in pressure contact with the inner surface of the pipe P.

一方の管Ｐの受口１に他方の管Ｐの挿し口２を水密パッキング３を介在して挿し込んだ継手部ａの水圧試験器Ａであり、
両側が閉じられた水密な円筒体１０からなり、この円筒体１０は、その筒軸方向一定長さを隔てて全周に亘る膨縮部１１、１１が形成され、その両膨縮部１１、１１間の外面に開口する注水ホース１２が接続されているとともに、円筒体１０内に開口する注水ホース１４が接続されており、
上記管Ｐ内に、上記継手部ａが上記両膨縮部１１、１１の間に位置するように上記円筒体１０を入れ、上記注水ホース１４から前記円筒体１０内に注水して前記両膨縮部１１、１１を膨張させて管Ｐ内面全周に亘り圧接して前記継手部ａの両側を水密とし、上記注水ホース１２から両膨縮部１１、１１間に注水する水圧試験器Ａにおいて、
上記膨縮部１１が弾性体製チューブからなり、そのチューブ１１の端縁全周外面に縮径可能な筒状固定具２２を嵌めるとともに、チューブ１１の端縁全周内面に上記円筒体１０の両側を閉じる側板１６の全周の筒状フランジを嵌め、前記固定具の外面に締結バンド１８を嵌めて締め付けたことを特徴とする水圧試験器。 A water pressure tester A for a joint portion a in which the insertion port 2 of the other tube P is inserted into the receiving port 1 of the one tube P through the watertight packing 3,
It consists of a watertight cylindrical body 10 closed on both sides, and this cylindrical body 10 is formed with expansion / contraction portions 11, 11 over the entire circumference with a certain length in the cylinder axis direction. The water injection hose 12 that opens to the outer surface between 11 is connected, and the water injection hose 14 that opens into the cylindrical body 10 is connected,
The cylindrical body 10 is placed in the pipe P so that the joint portion a is located between the expansion / contraction portions 11, 11, and water is injected into the cylindrical body 10 from the water injection hose 14, thereby In the hydraulic pressure tester A in which the contraction portions 11 and 11 are expanded and pressed against the entire inner surface of the pipe P to make both sides of the joint portion a watertight, and water is injected between the expansion and contraction portions 11 and 11 from the water injection hose 12. ,
The expansion / contraction portion 11 is made of an elastic tube, and a cylindrical fixture 22 that can be reduced in diameter is fitted to the outer peripheral surface of the end edge of the tube 11, and the cylindrical body 10 is connected to the inner peripheral surface of the end edge of the tube 11. A hydraulic pressure tester characterized in that a cylindrical flange around the entire periphery of the side plate 16 closing both sides is fitted, and a fastening band 18 is fitted and tightened on the outer surface of the fixture.

上記筒状固定具２２がゴムなどの弾性体からなることを特徴とする請求項８に記載の水圧試験器。 The water pressure tester according to claim 8, wherein the cylindrical fixture 22 is made of an elastic body such as rubber.

一方の管Ｐの受口１に他方の管Ｐの挿し口２を水密パッキング３を介在して挿し込んだ継手部ａの水圧試験器Ａであり、
両側が閉じられた水密な円筒体１０からなり、この円筒体１０は、その筒軸方向一定長さを隔てて全周に亘る膨縮部１１、１１が形成され、その両膨縮部１１、１１間の外面に開口する注水ホース１２が接続されているとともに、円筒体１０内に開口する注水ホース１４が接続されており、
上記管Ｐ内に、上記継手部ａが上記両膨縮部１１、１１の間に位置するように上記円筒体１０を入れ、上記注水ホース１４から前記円筒体１０内に注水して前記両膨縮部１１、１１を膨張させて管Ｐ内面全周に亘り圧接して前記継手部ａの両側を水密とし、上記注水ホース１２から両膨縮部１１、１１間に注水する水圧試験器Ａにおいて、
上記円筒体１０の周囲にキャスター１９を設けて円筒体１０が移動自在になっており、そのキャスター１９の支持杆２０は、前記円筒体１０に揺動自在に設けられているとともに円筒体１０に設けられたボルト３３が挿通し、そのボルト３３には、支持杆２０の内側への揺動を阻止するナット３４がねじ込まれており、そのナット３４のねじ込み位置により前記支持杆２０が任意の揺動位置で固定されることを特徴とする水圧試験器。 A water pressure tester A of a joint portion a in which the insertion port 2 of the other tube P is inserted into the receiving port 1 of the one tube P through the watertight packing 3,
It consists of a watertight cylindrical body 10 closed on both sides, and this cylindrical body 10 is formed with expansion / contraction portions 11, 11 over the entire circumference with a certain length in the cylinder axis direction. The water injection hose 12 that opens to the outer surface between 11 is connected, and the water injection hose 14 that opens into the cylindrical body 10 is connected,
The cylindrical body 10 is placed in the pipe P so that the joint portion a is located between the expansion / contraction portions 11, 11, and water is injected into the cylindrical body 10 from the water injection hose 14, thereby In the hydraulic pressure tester A in which the contraction portions 11 and 11 are expanded and pressed against the entire inner surface of the pipe P to make both sides of the joint portion a watertight, and water is injected between the expansion and contraction portions 11 and 11 from the water injection hose 12. ,
A caster 19 is provided around the cylindrical body 10 so that the cylindrical body 10 can be moved. A support rod 20 of the caster 19 is provided on the cylindrical body 10 so as to be swingable. The provided bolt 33 is inserted, and a nut 34 is screwed into the bolt 33 so as to prevent the support rod 20 from swinging inward. A hydraulic tester that is fixed in a moving position.