JP3391898B2 - Piping method in the curved part of the existing pipeline - Google Patents
Piping method in the curved part of the existing pipelineInfo
- Publication number
- JP3391898B2 JP3391898B2 JP15862394A JP15862394A JP3391898B2 JP 3391898 B2 JP3391898 B2 JP 3391898B2 JP 15862394 A JP15862394 A JP 15862394A JP 15862394 A JP15862394 A JP 15862394A JP 3391898 B2 JP3391898 B2 JP 3391898B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- existing pipeline
- curved
- straight
- piping
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、既設管路内に新たに配
管して既設管路を更生する際に、既設管路の湾曲部に対
して好適に実施される配管方法に関する。
【０００２】
【従来の技術】近時、老朽化した既設管路を更生するた
めに、既設管路内に新たに繊維強化樹脂管等を配管する
パイプ・イン・パイプ工法が注目されている。このパイ
プ・イン・パイプ工法では、既設管路が湾曲している場
合に、その湾曲部に沿わせて配管することが容易ではな
く、各種方法が提案されている。
【０００３】例えば、特開昭５８−２４６７８号公報、
特公昭６０−１０２３４号公報等には、軸心線が直線状
態になっており、しかも、各端面が軸心に対して傾斜状
態になった複数の短管同士を接合して、既設管路の湾曲
部に沿った状態に配管する方法が開示されている。ま
た、特開平４−１２５３８２号公報には、軸心線が途中
で折れ曲がった管（えび管）を使用して、既設管路の湾
曲部に沿って配管する方法が開示されている。
【０００４】
【発明が解決しようとする課題】軸心線が直線状態にな
った短管を使用して、既設管路の湾曲部に沿うようにす
る方法では、短管同士、あるいは短管と他の直管とが折
れ曲がった状態で接合されるために、管内周面同士の接
合部において、内部の流体が乱れた状態になる。同様
に、軸心線が折れ曲がったえび管を使用する場合にも、
えび管の折れ曲がった部分で流体が乱れ、内部を円滑に
流動しないという問題がある。
【０００５】また、いずれの場合にも、既設管路の湾曲
部の曲率は一定しないために、その湾曲部に対応した管
路を形成するために、多数の種類の短管あるいはえび管
を準備する必要があり、経済性が損なわれる。
【０００６】本発明は、このような問題を解決するもの
であり、その目的は、内部を流体が乱れることなく円滑
に流動し、しかも、少数の種類で、異なる曲率半径の既
設管路の湾曲部に沿った状態に配管することができる既
設管路の湾曲部内配管方法を提供することにある。
【０００７】
【課題を解決するための手段】本発明の既設管路の湾曲
部内配管方法は、既設管路内に配管して既設管路を更生
する際に、軸心線が直線状態になった適当な長さの、両
端部が挿し口になっている直管同士を、各端部に受け口
がそれぞれ設けられ、各端部の受け口を除いた部分が湾
曲した本体部となっており、各受け口は軸心線が直線状
態となっている適当な曲がり角度の曲管によって、その
各受け口の内部に、前記直管の端部の挿し口をそれぞれ
挿入接合して、既設管路の湾曲部に沿うように配管する
ことを特徴とし、そのことにより上記目的が達成され
る。
【０００８】
【作用】本発明の既設管路の湾曲部内配管方法では、直
管同士が曲管によって接合されて、既設管路の湾曲部に
沿った状態に配管されると、配管の内周面は、折れ曲が
った状態にならず、内部を流体が円滑に流動する。
【０００９】
【実施例】以下、本発明の実施例を図面に基づいて説明
する。
【００１０】図１は本発明の配管方法によって配管され
た状態の一例を示す断面図である。この配管は、既設管
路３０における湾曲部３１において、軸心線が直線状に
なった一対の直管１０同士を、軸心線が適当な曲率半径
で湾曲した曲管２０によって連結して、既設管路３０の
湾曲部３１に沿わせている。
【００１１】直管１０は、外径および内径が一定になっ
ており、両端部が挿し口になっている。曲管２０は、軸
心線が所定の曲率で湾曲しており、各端部に受け口２１
がそれぞれ設けられている。曲管２０は、各端部の受け
口２１を除いた部分が、内径および外径が一定になって
湾曲した本体部２２になっている。各受け口２１は、軸
心線が直線状態になっており、その内部に、直管１０の
各端部の挿し口がそれぞれ挿入されて、両者がゴム輪２
３によって液密状態に接合される。
【００１２】既設管路３０における湾曲部３１の曲率半
径が大きい場合には、複数の曲管２０が使用され、各曲
管２０によって一対の直管１０同士が連結されて、既設
管路３０における湾曲部３１に沿った状態にされる。
【００１３】曲管２０は、内周面が軸心方向に円滑に湾
曲した状態になっており、直管１０の内周面も、曲管２
０の受け口２１内周面に円滑に連続しているために、配
管の内周面は、折れ曲がったり屈曲せず、内部を流体が
円滑に流動する。
【００１４】直管１０の長さ、曲管２０の曲げ角度、曲
管２０の配置等は、既設管路３０の湾曲部３１の曲率半
径に基づいて、適宜、設定される。例えば、複数の直管
１０と曲げ角度が異なる各種の曲管２０とを交互に接合
して配管した場合に、直管１０の長さが４ｍと２ｍのそ
れぞれについて、曲管２０の曲げ角度と完成した配管の
曲率半径との関係を表１に示す。ただし、曲管の長さを
１ｍとした。曲げ角度が２°の曲管２０を使用した場
合、直管１０の長さが４ｍであると配管の曲率半径は１
４３．２ｍになり、直管１０の長さが２ｍであると配管
の曲率半径は８５．９ｍとなる。以下、曲管２０の曲げ
角度が４°の場合には、配管の曲率半径は７１．６ｍと
４３．０ｍ、曲管２０の曲げ角度が６°の場合には、配
管の曲率半径は４７．８ｍと２８．７ｍ、曲管２０の曲
げ角度が８°の場合には、配管の曲率半径は３５．８ｍ
と２１．５ｍ、曲管２０の曲げ角度が１０°の場合に
は、配管の曲率半径は２８．７ｍと１７．２ｍになる。
【００１５】
【表１】
【００１６】既設管路３０内に対する配管方法の実施状
態の一例を図２に示す。まず、既設管路３０の端部に連
通する発振立坑４１を形成して、この発振立坑４１の開
口部上にクレーン４２を設置する。また、既設管路３０
の底部に、走行台車４３を案内する軌条４４を敷設す
る。そして、地表のクレーン４２の近傍に、直管１０お
よび曲管２０等を配置しておく。発振立坑４１内には、
走行台車４３を走行させるためのバッテリー機関車４５
が軌条４４上に設置されている。
【００１７】既設管路３０の湾曲部３１内に配管する場
合には、地表において、予め、湾曲部３１に沿うように
配管される所定の直管１０と曲管２０とを接合してお
き、接合された直管１０と曲管２０とが、クレーン４２
によって発振立坑４１内に搬入される。そして、発振立
坑４１内の走行台車４３上に、接合された直管１０およ
び曲管２０が載置され、バッテリー機関車４５によって
既設管路３０の湾曲部３１へと搬送される。そして、湾
曲部３１に順番に搬送される接合された直管１０および
曲管２０同士が、順次、その湾曲部３１にて接合され
る。
【００１８】既設管路３０内の配管が終了すると、地表
に設けられた注入プラント４６から延びるホース４７に
よって、既設管路３０内周面と、既設管路３０内の配管
との間隙内に、エアーモルタル等の充填材４８が充填さ
れる。
【００１９】なお、既設管路３０内周面とその内部に配
管される直管１０および曲管２０の外周面との間の間隙
が小さい場合には、直管１０と曲管２０とを予め地表に
て接合せずに、それぞれ単体として既設管路３０の湾曲
部３１にまで搬送して、その湾曲部３１にて両者を接合
するようにしてもよい。
【００２０】図３は、直管１０と曲管２０とが、製造時
に接合されている管材５０の断面図である。この管材５
０は、外径および内径が一定の直管１０の一方の端部に
湾曲した曲管２０が、工場にて一体的に取り付けられて
製造されている。
【００２１】直管１０は、例えば、ガラス繊維強化樹脂
モルタル（ＦＲＰＭ）によって構成されており、曲管２
０はガラス繊維強化樹脂（ＦＲＰ）によって構成されて
いる。ＦＲＰＭ製の直管１０は、図４に示すように、内
周面および外周面に保護層１１が設けられており、中央
部には、不飽和ポリエステル樹脂と硅砂の骨材とにより
構成された樹脂モルタル層１２が設けられている。そし
て、各保護層１１と樹脂モルタル層１２との間に、ＦＲ
Ｐ層１３が設けられている。このＦＲＰ層１３は、一対
の周方向ガラス繊維１３ａの間に軸方向ガラス繊維１３
ｂが積層されて樹脂が含浸されたものである。
【００２２】ＦＲＰ製の曲管２０は、直管１０の外周の
ＦＲＰ層１３と一体となって、直管１０に取り付けられ
ている。
【００２３】このような構成の管材５０も、順次、既設
管路３０内に搬入されて、湾曲部３１にて接合され、そ
の湾曲部３１に沿った状態に配管される。
【００２４】
【発明の効果】本発明の既設管路の湾曲部内配管方法
は、このように、適当な長さの直管同士が、両端部が挿
し口になっている直管同士が、各端部に受け口がそれぞ
れ設けられ、各端部の受け口を除いた部分が湾曲した本
体部となっており、各受け口は軸心線が直線状態となっ
ている適当な曲がり角度の曲管によって連結されて、既
設管路の湾曲部に沿った状態にされるために、配管の内
部は折れ曲がった部分がなく、流体が円滑に流動する。
しかも、所定の長さの直管と所定の曲がり角度の曲管と
を組み合わせることによって、既設管路の湾曲部の曲率
半径に合わせることができ、従って、その湾曲部に沿わ
せた状態に容易に配管することができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for a curved portion of an existing pipeline when renewing the existing pipeline by newly piping inside the existing pipeline. To a piping method to be implemented. 2. Description of the Related Art In recent years, in order to rehabilitate an aging existing pipeline, a pipe-in-pipe method for newly laying a fiber-reinforced resin pipe or the like in the existing pipeline has attracted attention. In this pipe-in-pipe method, when an existing pipeline is curved, it is not easy to perform piping along the curved portion, and various methods have been proposed. For example, Japanese Patent Application Laid-Open No. 58-24678,
In Japanese Patent Publication No. 60-10234, etc., a plurality of short pipes having an axial center line in a straight line and each end face being inclined with respect to the axial center are joined together to form an existing pipeline. A method is disclosed in which piping is performed along a curved portion of a pipe. Further, Japanese Patent Application Laid-Open No. 4-125382 discloses a method in which a pipe (shrimp pipe) whose axis is bent in the middle is used to pipe along a curved portion of an existing pipeline. [0004] In a method of using a short pipe having an axial center line in a straight line so as to follow a curved portion of an existing pipeline, the short pipes or short pipes are connected to each other. Since the other straight pipe is joined in a bent state, the internal fluid is disturbed at the joint between the pipe inner peripheral surfaces. Similarly, when using a shrimp tube with a bent axis,
There is a problem that the fluid is disturbed at the bent portion of the shrimp tube and does not flow smoothly inside. In any case, since the curvature of the curved portion of the existing pipeline is not constant, many types of short pipes or shrimp pipes are prepared to form a pipeline corresponding to the curved portion. Must be done, and the economics will suffer. SUMMARY OF THE INVENTION The object of the present invention is to solve such a problem, and an object of the present invention is to solve the problem of curving an existing pipeline of a small number of types having different radii of curvature by smoothly flowing the fluid through the interior without being disturbed. It is an object of the present invention to provide a piping method in a curved portion of an existing pipeline, which can be piped along a portion. [0007] According to the piping method in the curved portion of the existing pipeline of the present invention, when the existing pipeline is rebuilt by piping in the existing pipeline, the axis becomes straight. Suitable length , both
Insert straight pipes with insertion ports at each end
Are provided, and the part excluding the receptacle at each end is a bay
It is a curved main body, and each receiving port has a straight axis line
By bent tube of an appropriate bending angle that is on purpose, the
Insert the insertion port at the end of the straight pipe inside each receptacle.
The present invention is characterized in that the pipe is inserted and joined and is arranged along the curved portion of the existing pipeline, thereby achieving the above object. According to the piping method in the bent portion of the existing pipeline of the present invention, when the straight pipes are joined by a curved pipe and are piped along the bent portion of the existing pipeline, the inner circumference of the pipe is reduced. The surface does not become bent, and the fluid flows smoothly inside. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a state where piping is performed by the piping method of the present invention. In this pipe, a pair of straight pipes 10 whose axis is linearly connected to each other by a curved pipe 20 whose axis is curved at an appropriate radius of curvature in a curved portion 31 of an existing pipeline 30. It is along the curved portion 31 of the existing pipeline 30. The straight pipe 10 has a constant outer diameter and inner diameter, and both ends are insertion ports. The curved tube 20 has an axial center line curved at a predetermined curvature, and has a socket 21 at each end.
Are provided respectively. The curved tube 20 has a body portion 22 having a constant inner diameter and an outer diameter except for a receiving port 21 at each end. Each receiving port 21 has an axial center line in a straight line, and the insertion port at each end of the straight pipe 10 is inserted into the receiving port 21.
3 are joined in a liquid-tight state. When the radius of curvature of the curved portion 31 in the existing pipeline 30 is large, a plurality of curved pipes 20 are used, and a pair of straight pipes 10 are connected to each other by the curved pipes 20. The state is set along the curved portion 31. The curved pipe 20 has an inner peripheral surface that is smoothly curved in the axial direction, and the inner peripheral surface of the straight pipe 10 is also curved.
Since the inner peripheral surface of the pipe is smoothly continuous with the inner peripheral surface of the receiving port 21, the fluid flows smoothly inside the pipe without being bent or bent. The length of the straight pipe 10, the bending angle of the bent pipe 20, the arrangement of the bent pipe 20, and the like are appropriately set based on the radius of curvature of the bending portion 31 of the existing pipe 30. For example, when a plurality of straight pipes 10 and various bent pipes 20 having different bending angles are alternately joined and piped, the bending angle of the bent pipe 20 and the length of the straight pipe 10 are 4 m and 2 m, respectively. Table 1 shows the relationship with the radius of curvature of the completed pipe. However, the length of the curved tube was 1 m. When the bent pipe 20 having a bending angle of 2 ° is used, if the length of the straight pipe 10 is 4 m, the radius of curvature of the pipe is 1
When the length of the straight pipe 10 is 2 m, the radius of curvature of the pipe becomes 85.9 m. Hereinafter, when the bending angle of the curved pipe 20 is 4 °, the radius of curvature of the pipe is 71.6 m and 43.0 m. When the bending angle of the bent pipe 20 is 6 °, the radius of curvature of the pipe is 47. When the bending angle of the bent pipe 20 is 8 °, the bending radius of the pipe is 35.8 m.
When the bending angle of the curved pipe 20 is 10 °, the curvature radii of the pipes are 28.7 m and 17.2 m. [Table 1] FIG. 2 shows an example of the state of implementation of the piping method in the existing pipeline 30. First, an oscillation shaft 41 communicating with the end of the existing pipeline 30 is formed, and a crane 42 is installed on the opening of the oscillation shaft 41. In addition, the existing pipeline 30
A rail 44 for guiding the traveling vehicle 43 is laid at the bottom of the vehicle. Then, the straight pipe 10 and the bent pipe 20 are arranged near the crane 42 on the ground surface. In the oscillation shaft 41,
Battery locomotive 45 for running traveling carriage 43
Is installed on the rail 44. In the case of piping inside the curved portion 31 of the existing pipeline 30, a predetermined straight pipe 10 and a curved pipe 20 which are piped along the curved portion 31 are previously joined on the surface of the ground, The joined straight pipe 10 and curved pipe 20 are connected to a crane 42.
As a result, it is carried into the oscillation shaft 41. Then, the joined straight pipe 10 and curved pipe 20 are placed on the traveling carriage 43 in the oscillation shaft 41, and are transported by the battery locomotive 45 to the curved portion 31 of the existing pipeline 30. Then, the joined straight pipes 10 and curved pipes 20 that are sequentially conveyed to the bending portion 31 are sequentially joined at the bending portion 31. When the piping in the existing pipeline 30 is completed, a hose 47 extending from an injection plant 46 provided on the surface of the ground, forms a gap between the inner peripheral surface of the existing pipeline 30 and the piping in the existing pipeline 30 by using a hose 47. A filler 48 such as air mortar is filled. When the gap between the inner peripheral surface of the existing pipeline 30 and the outer peripheral surfaces of the straight pipe 10 and the curved pipe 20 provided therein is small, the straight pipe 10 and the curved pipe 20 are separated in advance. Instead of being joined on the surface of the ground, each may be transported as a single unit to the curved portion 31 of the existing pipeline 30 and joined together at the curved portion 31. FIG. 3 is a cross-sectional view of a tube 50 in which the straight tube 10 and the bent tube 20 are joined at the time of manufacture. This tube material 5
No. 0 is manufactured by integrally bending a curved pipe 20 at one end of a straight pipe 10 having a constant outer diameter and inner diameter at a factory. The straight pipe 10 is made of, for example, glass fiber reinforced resin mortar (FRPM).
Numeral 0 is made of glass fiber reinforced resin (FRP). As shown in FIG. 4, a straight pipe 10 made of FRPM is provided with a protective layer 11 on an inner peripheral surface and an outer peripheral surface, and is formed of an unsaturated polyester resin and an aggregate of silica sand in a central portion. A resin mortar layer 12 is provided. Then, between each protective layer 11 and the resin mortar layer 12, FR
A P layer 13 is provided. The FRP layer 13 has an axial glass fiber 13 between a pair of circumferential glass fibers 13a.
b is laminated and impregnated with resin. The FRP bent pipe 20 is attached to the straight pipe 10 integrally with the FRP layer 13 on the outer periphery of the straight pipe 10. The pipe member 50 having such a structure is also sequentially carried into the existing pipeline 30, joined at the curved portion 31, and is piped along the curved portion 31. As described above, according to the piping method in the curved portion of the existing pipeline of the present invention, straight pipes of an appropriate length are inserted at both ends.
The straight pipes that are the outlets have a receiving port at each end.
Book with a curved section except for the receptacle at each end
It is a body part, and each receiving port is in a straight line with the axis center line
Since the pipes are connected by a curved pipe having an appropriate bending angle so as to be along the curved portion of the existing pipeline, there is no bent portion inside the pipe, and the fluid flows smoothly.
Moreover, by combining a straight pipe with a predetermined length and a bent pipe with a predetermined bending angle, it is possible to match the curvature radius of the curved portion of the existing pipeline, and therefore, it is easy to conform to the state along the curved portion. Can be plumbed.
【図面の簡単な説明】
【図１】本発明の既設管路の湾曲部内配管方法の一例を
示す断面図である。
【図２】その配管方法の実施状態を示す概略図である。
【図３】その配管方法の実施に使用される直管と曲管同
士が予め接合された管材の断面図である。
【図４】その管材の直管の要部を断面図である。
【符号の説明】
１０ 直管
１１ 保護層
１２ 樹脂モルタル層
１３ ＦＲＰ層
２０ 曲管
２１ 受け口
２２ 本体部
３０ 既設管路
３１ 湾曲部BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view illustrating an example of a piping method in a curved portion of an existing pipeline according to the present invention. FIG. 2 is a schematic diagram showing an implementation state of the piping method. FIG. 3 is a cross-sectional view of a pipe material used in carrying out the piping method, in which a straight pipe and a curved pipe are joined in advance. FIG. 4 is a sectional view of a main part of a straight pipe of the pipe material. [Description of Signs] 10 Straight pipe 11 Protective layer 12 Resin mortar layer 13 FRP layer 20 Curved pipe 21 Receptacle 22 Main body section 30 Existing pipe line 31 Curved section
フロントページの続き (56)参考文献 特開 平４−125382（ＪＰ，Ａ) 特開 昭58−178080（ＪＰ，Ａ) 特開 昭61−252988（ＪＰ，Ａ) 特開 昭58−178079（ＪＰ，Ａ) 特開 昭58−81289（ＪＰ，Ａ) 特開 昭59−164489（ＪＰ，Ａ) 特開 昭59−26684（ＪＰ，Ａ) 特開 昭58−24678（ＪＰ，Ａ) 特公 昭60−10234（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) F16L 1/00 F16L 21/02 Continuation of the front page (56) References JP-A-4-125382 (JP, A) JP-A-58-178080 (JP, A) JP-A-61-252988 (JP, A) JP-A-58-178079 (JP) JP-A-58-81289 (JP, A) JP-A-59-164489 (JP, A) JP-A-59-26684 (JP, A) JP-A-58-24678 (JP, A) 60-10234 (JP, B1) (58) Fields investigated (Int. Cl. 7 , DB name) F16L 1/00 F16L 21/02
Claims (1)
る際に、軸心線が直線状態になった適当な長さの、両端
部が挿し口になっている直管同士を、各端部に受け口が
それぞれ設けられ、各端部の受け口を除いた部分が湾曲
した本体部となっており、各受け口は軸心線が直線状態
となっている適当な曲がり角度の曲管によって、その各
受け口の内部に、前記直管の端部の挿し口をそれぞれ挿
入接合して、既設管路の湾曲部に沿うように配管するこ
とを特徴とする既設管路の湾曲部内配管方法。(57) [Claims] [Claim 1] When piping in an existing pipeline and rehabilitating the existing pipeline , both ends of an appropriate length whose axis is in a straight line state.
The straight pipes where the part is the insertion port , the receptacle at each end
Each part is provided, and the part excluding the receptacle at each end is curved
The main body is made, and each receiving port has a straight axis
By appropriate bending angles bends of which has become, each
Insert the insertion holes at the ends of the straight pipe into the receiving holes, respectively.
A piping method in a curved portion of an existing pipeline, wherein the piping is joined along the curved portion of the existing pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15862394A JP3391898B2 (en) | 1993-12-09 | 1994-07-11 | Piping method in the curved part of the existing pipeline |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5-309070 | 1993-12-09 | ||
| JP30907093 | 1993-12-09 | ||
| JP15862394A JP3391898B2 (en) | 1993-12-09 | 1994-07-11 | Piping method in the curved part of the existing pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07217771A JPH07217771A (en) | 1995-08-15 |
| JP3391898B2 true JP3391898B2 (en) | 2003-03-31 |
Family
ID=26485670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15862394A Expired - Lifetime JP3391898B2 (en) | 1993-12-09 | 1994-07-11 | Piping method in the curved part of the existing pipeline |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3391898B2 (en) |
-
1994
- 1994-07-11 JP JP15862394A patent/JP3391898B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07217771A (en) | 1995-08-15 |
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