JPH0565814B2 - - Google Patents
Info
- Publication number
- JPH0565814B2 JPH0565814B2 JP60263443A JP26344385A JPH0565814B2 JP H0565814 B2 JPH0565814 B2 JP H0565814B2 JP 60263443 A JP60263443 A JP 60263443A JP 26344385 A JP26344385 A JP 26344385A JP H0565814 B2 JPH0565814 B2 JP H0565814B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- water
- pipe
- face plate
- water pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Examining Or Testing Airtightness (AREA)
- Fluid-Pressure Circuits (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は水圧試験における管体締付力制御方法
に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for controlling the clamping force of a pipe in a hydraulic test.
従来の技術
遠心鋳造により鋳鉄管を製造したような場合に
は、この管の面端を面板で閉塞した状態で管内に
加圧水を注入する水圧試験が実施される。この水
圧試験によると、管壁にピンホールやクラツク等
の欠陥が存在する場合にその部分から水が漏れる
ため、この欠陥の有無を判定できるものである。BACKGROUND ART When a cast iron pipe is manufactured by centrifugal casting, a water pressure test is carried out in which pressurized water is injected into the pipe with the end of the pipe closed with a face plate. According to this water pressure test, if there is a defect such as a pinhole or crack in the pipe wall, water will leak from that part, so it can be determined whether or not there is a defect.
このとき、面板による管体のクランプ圧力は、
この面板からの水漏れ防止のため、水圧試験中に
管内の加圧水により面板に作用する水圧よりも大
きくしなければならない。このため従来は、試験
中に作用する最大水圧よりも大きな圧力で面板を
管体にクランプしている。 At this time, the clamping pressure of the tube body by the face plate is
To prevent water leakage from the face plate, the water pressure must be greater than the water pressure acting on the face plate due to the pressurized water inside the pipe during the water pressure test. For this reason, conventionally, the face plate is clamped to the tube body with a pressure greater than the maximum water pressure acting during the test.
発明が解決しようとする問題点
ところが、このようにすると、管体を面板でク
ランプした直後等においては、まだ管内に加圧水
が供給されておらず、このため面板は加圧水から
の水圧を受けない。この結果クランプ力がすべて
管体に作用してしまい、管体に過大な圧縮応力や
座屈応力が発生しやすいという問題点がある。Problems to be Solved by the Invention However, when doing this, pressurized water is not yet supplied into the pipe immediately after the pipe body is clamped with the face plate, and therefore the face plate does not receive water pressure from the pressurized water. As a result, all of the clamping force acts on the tube, resulting in a problem that excessive compressive stress or buckling stress is likely to occur in the tube.
そこで本発明はこのような問題点を解決し、管
体に上記のような過大な圧縮応力や座屈応力が生
じないようにすることを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and to prevent the above-mentioned excessive compressive stress and buckling stress from occurring in the pipe body.
問題点を解決するための手段
上記問題点を解決するため本発明は、管体の両
端開口を面板で閉塞しした状態でこの管体内に加
圧水を供給して水圧試験を行なうに際し、前記加
圧水の水圧を規定試験水圧に向けて徐々に昇圧さ
せるとともに、この規定試験水圧から徐々に降圧
させ、前記面板の管体に対するクランプ圧力を、
前記加圧水の水圧よりも一定値だけ高圧となるよ
うに、前記加圧水の水圧変化に追従させて変化さ
せるものである。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides that when performing a water pressure test by supplying pressurized water into the tube with both end openings of the tube closed with face plates, The water pressure is gradually increased toward the specified test water pressure, and the pressure is gradually decreased from this specified test water pressure, and the clamping pressure of the face plate against the pipe body is
The pressure is changed to follow changes in the pressure of the pressurized water so that the pressure is higher than the pressure of the pressurized water by a certain value.
作 用
このようにすると、クランプ圧力は、加圧水の
圧力変化に対応してこの加圧水が漏れない程度に
追従することになるため、面板に大きな水圧が作
用しないときにこの面板にて管体を必要以上の力
でクランプすることが防止される。このため管体
に過大な圧縮応力や座屈応力が発生するのが合防
止される。Effect By doing this, the clamping pressure will follow the pressure change of the pressurized water to the extent that this pressurized water does not leak, so when large water pressure does not act on the face plate, the pipe body is not required at this face plate. This prevents clamping with more force. This prevents excessive compressive stress or buckling stress from occurring in the tube.
実施例
第２図は水圧試験装置の概略構成を示すもので
ある。ここで１は供試用の管体で、遠心鋳造され
たダクタイル鋳鉄管にて構成され、一端に受口２
を有するとともに他端に挿口３を有している。
４，５は管体１の両端開口を閉塞する面板で、挿
口３側の面板５を固定式とするともに、受口２側
の面板４を可動式としてクランプ圧力を発生可能
としている。Embodiment FIG. 2 shows a schematic configuration of a hydraulic test device. Here, 1 is a test tube, which is made of a centrifugally cast ductile cast iron tube, and has a socket 2 at one end.
It has a socket 3 at the other end.
Reference numerals 4 and 5 denote face plates that close the openings at both ends of the tube body 1. The face plate 5 on the side of the socket 3 is fixed, and the face plate 4 on the side of the socket 2 is movable so that clamping pressure can be generated.
すなわち、面板４には、主としてこの面板４を
移動させるための低圧シリンダ６と、面板４にク
ランプ圧力を発生させるための高圧シリンダ７と
が連結されている。８は低圧ポンプで、低圧側切
換弁９を介して低圧シリンダ６に接続されてい
る。また１０は高圧ポンプで、高圧側切換弁１１
および圧力制御弁１２を介して高圧シリンダ７に
接続されている。PS１およびPS４は、低圧側お
よび高圧側の配管内の圧力を検出するための圧力
センサである。圧力センサPS４は、圧力制御弁
１２にフイードバツク信号を出力するようにされ
ている。 That is, the face plate 4 is connected to a low pressure cylinder 6 mainly for moving the face plate 4 and a high pressure cylinder 7 for generating clamp pressure on the face plate 4. A low pressure pump 8 is connected to the low pressure cylinder 6 via a low pressure side switching valve 9. In addition, 10 is a high pressure pump, and a high pressure side switching valve 11
and is connected to the high pressure cylinder 7 via a pressure control valve 12. PS1 and PS4 are pressure sensors for detecting the pressure inside the pipes on the low pressure side and the high pressure side. Pressure sensor PS4 is adapted to output a feedback signal to pressure control valve 12.
挿口３側の面板５には、この面板５を貫通して
管体１内に加圧水を供給可能な給水管１３が接続
されている。この給水管１３には低圧用の充水ポ
ンプ１４と高圧用の加圧ポンプ１５とが接続さ
れ、充水ポンプ１４には充水弁１６が設けられて
いる。１７は別系統の加圧水供給路で、充水弁１
８を介して給水管１３に接続されている。 A water supply pipe 13 is connected to the face plate 5 on the side of the insertion port 3, which can pass through the face plate 5 and supply pressurized water into the pipe body 1. A water filling pump 14 for low pressure and a pressure pump 15 for high pressure are connected to this water supply pipe 13, and the water filling pump 14 is provided with a water filling valve 16. 17 is a pressurized water supply line of another system, and the water filling valve 1
It is connected to the water supply pipe 13 via 8.
受口２側の面板４には管体１内に連通するエア
抜き管１９が接続され、このエア抜き管１９に
は、管体１内の水圧を検出するための圧力センサ
PS２，PS３と、エア抜き弁２０とが取付けられ
ている。圧力センサPS２，PS３は、その出力信
号により圧力制御弁１２を調節可能とされてい
る。 An air vent pipe 19 communicating with the pipe body 1 is connected to the face plate 4 on the side of the socket 2, and a pressure sensor for detecting the water pressure inside the pipe body 1 is connected to the air vent pipe 19.
PS2, PS3 and an air bleed valve 20 are attached. The pressure sensors PS2 and PS3 can adjust the pressure control valve 12 based on their output signals.
次に第１図〜第２図にもとづいて水圧試験方法
を詳細に説明する。まず、両面板４，５間におけ
る所定位置に管体１を搬入し、この搬入が完了し
たなら、低圧側切換弁９を動作させて、低圧ポン
プ８からの低圧作動油を低圧シリンダ６に供給す
る。これにより低圧シリンダ６が伸長し、面板４
が管体１の受口２の端面に向けて移動する。この
とき、作動油の圧力は、面板４の移動に必要なだ
けの一定圧力P0となる。面板４が管１に当たる
と、低圧シリンダ６の伸びは停止され、この低圧
シリンダ６内の作動油の圧力が徐々に上昇する。 Next, the hydraulic test method will be explained in detail based on FIGS. 1 and 2. First, the pipe body 1 is carried into a predetermined position between the double-sided plates 4 and 5, and once this carrying is completed, the low pressure side switching valve 9 is operated to supply low pressure hydraulic oil from the low pressure pump 8 to the low pressure cylinder 6. do. This causes the low pressure cylinder 6 to extend and the face plate 4 to
moves toward the end face of the socket 2 of the tube body 1. At this time, the pressure of the hydraulic oil becomes a constant pressure P 0 necessary for moving the face plate 4. When the face plate 4 hits the pipe 1, the extension of the low-pressure cylinder 6 is stopped, and the pressure of the hydraulic fluid in the low-pressure cylinder 6 gradually increases.
この圧力が初期クランプ圧力P1まで上昇した
なら、これを圧力センサPS１にて検出し、その
出力信号により、エア抜き弁２０を開いた状態で
給水管１３により管体１内への充水を開始する。
その充水には、充水ポンプ１４と加圧水供給路１
７とのいずれか一方あるいは双方を主に利用でき
る。この充水時の管内水圧は、第１図のようにほ
ほ一定の値となる。 When this pressure rises to the initial clamp pressure P1 , this is detected by the pressure sensor PS1, and based on its output signal, water is filled into the pipe body 1 through the water supply pipe 13 with the air bleed valve 20 open. Start.
To fill the water, a water filling pump 14 and a pressurized water supply path 1 are used.
Either one or both of 7 and 7 can be mainly used. The water pressure inside the pipe during this water filling becomes a nearly constant value as shown in FIG.
充水の開始とともに、圧力センサPS１の出力
信号により切換弁９，１１をそれぞれ動作させ、
今度は高圧シリンダ７を作用させる。この高圧シ
リンダ７は、充水中は初期クランプ圧力P1で動
作される。また、充水時の管内水圧は圧力センサ
PS２にて検出され、圧力センサPS４および圧力
制御弁１２を利用して、前記初期クランプ圧力
P1は管内圧力よりも一定値だけ高圧となるよう
に制御される。この圧力にて、面板４，５が管体
１を水漏れなくクランプすることになる。 At the start of water filling, the switching valves 9 and 11 are operated by the output signal of the pressure sensor PS1,
This time, the high pressure cylinder 7 is activated. This high-pressure cylinder 7 is operated at an initial clamping pressure P 1 during filling. In addition, a pressure sensor measures the water pressure inside the pipe when filling with water.
The initial clamp pressure is detected by PS2 and is adjusted using pressure sensor PS4 and pressure control valve 12.
P 1 is controlled to be higher than the pipe pressure by a certain value. With this pressure, the face plates 4 and 5 clamp the tube body 1 without leaking water.
管体１内が満水状態となつたら、エア抜き弁２
０を閉じる。これにより管内水圧が上昇を始め、
前述の充水ポンプ１４、加圧水供給路１７により
一次昇圧が行なわれる。このとき、管体１内の水
圧が圧力センサPS２にて検出され、その出力信
号により圧力制御弁１２が動作されて、高圧シリ
ンダ７内のクランプ圧力がこれに追従して上昇さ
れる。これにより、クランプ圧力は、管内水圧に
対し常に一定値だけ高圧となるように制御され
る。 When the inside of pipe body 1 is full of water, open air bleed valve 2.
Close 0. As a result, the water pressure inside the pipe begins to rise,
The primary pressure is increased by the water filling pump 14 and the pressurized water supply path 17 described above. At this time, the water pressure within the pipe body 1 is detected by the pressure sensor PS2, and the pressure control valve 12 is operated based on the output signal thereof, and the clamp pressure within the high pressure cylinder 7 is increased accordingly. Thereby, the clamp pressure is controlled so that it is always higher than the pipe water pressure by a constant value.
管内水圧が一次昇圧後の所定水圧に達したな
ら、圧力センサPS２にてこれを検知する。この
とき、クランプ圧力は一次昇圧後クランプ圧力
P2となつている。この段階で充水ポンプ１４お
よび加圧水供給路１７の充水弁１６，１８を閉
じ、この後は高圧ポンプ１０のみを動作して二次
昇圧を行なう。この二次昇圧では、一次昇圧に比
べ昇圧速度は低下するが、試験時の規定水圧まで
確実に昇圧される。なお、この二次昇圧の際に
も、高圧シリンダ７のクランプ圧力は前記と同様
に管内水圧に追従して上昇される。 When the water pressure in the pipe reaches a predetermined water pressure after the primary pressure increase, this is detected by the pressure sensor PS2. At this time, the clamp pressure is the clamp pressure after the primary pressure increase.
It is marked P 2 . At this stage, the water filling pump 14 and the water filling valves 16, 18 of the pressurized water supply path 17 are closed, and after this, only the high pressure pump 10 is operated to perform secondary pressure increase. In this secondary pressurization, the pressure increase rate is lower than in the primary pressure increase, but the pressure is reliably increased to the specified water pressure during the test. Note that during this secondary pressure increase as well, the clamp pressure of the high pressure cylinder 7 is increased following the pipe water pressure in the same manner as described above.
管内水圧が試験時の規定水圧に達したなら、こ
れを圧力センサPS３にて検出し、昇圧を停止す
る。すると、管体１の内部は、一定時間につき、
規定水圧に定圧保持され、この規定水圧のもとで
の水圧試験が行なわれる。この試験中のクランプ
圧力P3は、やはり規定水圧よりも一定圧力だけ
高くなるように制御される。なお、両圧力センサ
PS２，PS３は同様に管体１内の水圧を検出する
ものであるが、圧力センサPS２は一次昇圧後の
所定水圧に対応して接点信号を出力し、また圧力
センサPS３は二次昇圧後の規定水圧に対応して
接点信号を出力するように、それぞれ機能してい
る。 When the water pressure in the pipe reaches the specified water pressure during the test, this is detected by the pressure sensor PS3 and the pressure increase is stopped. Then, the inside of the tube body 1 changes over a certain period of time.
The water pressure is kept constant at a specified water pressure, and the water pressure test is conducted under this specified water pressure. The clamp pressure P 3 during this test is also controlled to be higher than the specified water pressure by a constant pressure. In addition, both pressure sensors
PS2 and PS3 similarly detect the water pressure inside the tube body 1, but pressure sensor PS2 outputs a contact signal corresponding to a predetermined water pressure after the primary pressure increase, and pressure sensor PS3 outputs a contact signal corresponding to the predetermined water pressure after the secondary pressure increase. Each functions to output a contact signal in response to a specified water pressure.
水圧試験が終了したなら、エア抜き弁２０を開
いて管体１内を減圧する。これにより管内水圧は
急激に低下するが、この際にもクランプ圧力を追
従させ、クランプ圧力と管内水圧との間に大きな
圧力差が生じないようにする。 When the water pressure test is completed, the air bleed valve 20 is opened to reduce the pressure inside the pipe body 1. As a result, the water pressure in the pipe decreases rapidly, but the clamp pressure is made to follow this also at this time, so that a large pressure difference does not occur between the clamp pressure and the water pressure in the pipe.
このように本発明によれば、面板４，５による
管体１のクランプ圧力を管内水圧に追従させるも
のであるため、第１図の仮想線に示す従来の圧力
特性のように、充水時から試験時の水圧に対応し
たクランプ圧力を加えるものに比べ、管内水圧と
クランプ圧力との差を小さなものとすることがで
きる。 As described above, according to the present invention, the clamping pressure of the tube body 1 by the face plates 4 and 5 is made to follow the water pressure inside the tube. Compared to a method in which a clamp pressure corresponding to the water pressure during the test is applied, the difference between the water pressure in the pipe and the clamp pressure can be made smaller.
なお、上記においては、面板４，５による管体
１の締付力を、クランプ圧力すなわち高圧シリン
ダ７に供給される作動油の圧力で代表されたが、
実際には管体１の口径に応じて面板４，５におけ
る加圧水の受圧面積が増減するため、これにもと
づいてクランプ圧力を調節することにより、上記
締付力を適正なものにする必要がある。 In addition, in the above, the clamping force of the tube body 1 by the face plates 4 and 5 was represented by the clamp pressure, that is, the pressure of the hydraulic oil supplied to the high-pressure cylinder 7;
In reality, the pressure receiving area of the pressurized water in the face plates 4 and 5 increases or decreases depending on the diameter of the pipe body 1, so it is necessary to adjust the clamping pressure based on this to make the above-mentioned clamping force appropriate. .
発明の効果
以上述べたように本発明によると、管内におけ
る加圧水の圧力変化に対応して面板のクランプ圧
力を追従させるものであるため、面板に大きな水
圧が作用しないときにこの面板にて管体を必要以
上の力でクランプするのが防止され、この結果管
体に無理な圧縮応力や座屈応力が発生するのを防
止できる。Effects of the Invention As described above, according to the present invention, the clamping pressure of the face plate follows the pressure change of the pressurized water in the pipe, so when a large water pressure does not act on the face plate, the face plate clamps the pipe body. This prevents the tube from being clamped with more force than necessary, and as a result, it is possible to prevent unreasonable compressive stress or buckling stress from being generated in the tube.
第１図は本発明の一実施例における制御特性
図、第２図は水圧試験装置の概略構成図である。
１……管体、４，５……面板、７……高圧シリ
ンダ、１２……圧力制御弁、PS１〜PS４……圧
力センサ、１３……給水管、２０……エア抜き
弁。
FIG. 1 is a control characteristic diagram in one embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of a water pressure testing apparatus. 1... Pipe body, 4, 5... Face plate, 7... High pressure cylinder, 12... Pressure control valve, PS1 to PS4... Pressure sensor, 13... Water supply pipe, 20... Air bleed valve.
Claims (1)
管体内に加圧水を供給して水圧試験を行なうに際
し、前記加圧水の水圧を規定試験水圧に向けて
徐々に昇圧させるとともに、この規定試験水圧か
ら徐々に降圧させ、前記面板の管体に対するクラ
ンプ圧力を、前記加圧水の水圧よりも一定値だけ
高圧となるように、前記加圧水の水圧変化に追従
させて変化させることを特徴とする水圧試験にお
ける管体締付力制御方法。1 When performing a water pressure test by supplying pressurized water into the pipe with both end openings of the pipe closed with face plates, the pressure of the pressurized water is gradually increased toward the specified test water pressure, and the water pressure is increased from the specified test water pressure. A pipe for water pressure testing, characterized in that the pressure is gradually lowered and the clamping pressure of the face plate against the pipe body is changed to follow changes in the water pressure of the pressurized water so that the pressure is higher than the water pressure of the pressurized water by a certain value. Body tightening force control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60263443A JPS62123332A (en) | 1985-11-22 | 1985-11-22 | Pipe clamping force control method in water pressure test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60263443A JPS62123332A (en) | 1985-11-22 | 1985-11-22 | Pipe clamping force control method in water pressure test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62123332A JPS62123332A (en) | 1987-06-04 |
| JPH0565814B2 true JPH0565814B2 (en) | 1993-09-20 |
Family
ID=17389575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60263443A Granted JPS62123332A (en) | 1985-11-22 | 1985-11-22 | Pipe clamping force control method in water pressure test |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62123332A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4738783B2 (en) * | 2004-09-24 | 2011-08-03 | Ｊｆｅスチール株式会社 | Water pressure test equipment for welded steel pipes |
| US8731849B2 (en) * | 2010-01-19 | 2014-05-20 | Greene's Energy Group, Llc | Hydrostatic pressure testing system and method |
| JP5132737B2 (en) * | 2010-08-31 | 2013-01-30 | Ｊｆｅスチール株式会社 | Water pressure test equipment for welded steel pipes |
| JP5928796B2 (en) * | 2012-04-27 | 2016-06-01 | 新日鐵住金株式会社 | Steel pipe water pressure test apparatus and water pressure test method |
| CN111487056B (en) * | 2020-06-03 | 2021-10-15 | 港瑞控股集团有限公司 | Mounting structure of water pressure test equipment for building construction |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5433777A (en) * | 1977-08-19 | 1979-03-12 | Kubota Ltd | Water pressure resistance tester of pipe joint |
-
1985
- 1985-11-22 JP JP60263443A patent/JPS62123332A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62123332A (en) | 1987-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| NL8620423A (en) | SYSTEM FOR MEASURING THE PORE VOLUME AND PERMEABILITY OF VERY DENSITIVE CORE AND METHOD FOR ITS OPERATION. | |
| CN106769472A (en) | Based on the vertical mechanical load Experiment on Function device of concrete and test method under axial dispersion and the effect of lateral confined pressure | |
| CN113624610A (en) | Pipeline sealing performance detection device and detection method | |
| JPH0565814B2 (en) | ||
| CN103148056B (en) | Hydraulic device leakage measuring device | |
| CN207570982U (en) | A true triaxial seepage experimental structure with non-uniform load | |
| CN114526276B (en) | Special hydraulic station for testing functions of hydraulic reversing valve and testing method thereof | |
| CN110131240A (en) | A kind of hydraulic position and pressure closed loop control dynamic static simulation pilot system and method | |
| US2895328A (en) | Process and apparatus for pressure testing vessels | |
| CN205908361U (en) | Automatic change device of control rack engine cooling system pressure | |
| CN210665305U (en) | Embedded geotechnical triaxial instrument | |
| CN117664448A (en) | Watertight test system of deep sea water seal cable and assembly | |
| US5331842A (en) | Cyclical pressure testing apparatus | |
| CN115265956A (en) | Pressure system air tightness leakage detection device and method | |
| CN115901090B (en) | Pressure release test system for short-time-domain flat test piece | |
| JPH0419431B2 (en) | ||
| CN110290887B (en) | Die casting machine with valve diagnostic system | |
| CN222545204U (en) | A concrete impermeability testing device | |
| KR890004368B1 (en) | Checking of leakage | |
| CN110553866A (en) | A full-sea depth simulation test system for a seawater hydraulically adjustable ballast device | |
| JP4254961B2 (en) | Overflow check valve operation inspection method | |
| SU890108A1 (en) | Stand for testing bearings | |
| CN104181043B (en) | Tube bursting test apparatus with verification mechanism | |
| CN217842230U (en) | High-voltage pulse generating device | |
| JPS6116507Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |