JP3137731B2 - Existing tunnel removal shield machine - Google Patents
Existing tunnel removal shield machineInfo
- Publication number
- JP3137731B2 JP3137731B2 JP04132627A JP13262792A JP3137731B2 JP 3137731 B2 JP3137731 B2 JP 3137731B2 JP 04132627 A JP04132627 A JP 04132627A JP 13262792 A JP13262792 A JP 13262792A JP 3137731 B2 JP3137731 B2 JP 3137731B2
- Authority
- JP
- Japan
- Prior art keywords
- existing
- shell
- shield machine
- pipe
- existing tunnel
- 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
- Excavating Of Shafts Or Tunnels (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、不要になった既設の埋
設管を撤去するための既設トンネル撤去シールド機に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine for removing an existing tunnel, which is no longer required.
【０００２】[0002]
【従来の技術】例えばシールドトンネルを掘進する際な
どに、そのルート上にある既設の埋設管路を撤去するこ
とがある。従来の既設埋設管の撤去工法は、図６に示す
ように、まづ道路面１から地下の埋設管２をはさんで鋼
矢板３などを打ち込んで山留めを行う。ついで、その内
部を掘り下げて立坑４を形成し、鋼矢板３を山留め材５
で支持して地盤の崩壊を防ぐ。その後、地下の埋設管２
を撤去し、撤去したあとを埋め戻すというのが一般的で
ある。また、立坑４内に露出した撤去しない既設埋設管
６は、山留め材５に吊り防護部材７で吊り下げて保護さ
れる。2. Description of the Related Art For example, when excavating a shield tunnel, an existing buried pipeline on the route is sometimes removed. In the conventional method of removing an existing buried pipe, as shown in FIG. 6, a steel sheet pile 3 or the like is driven into the steel sheet pile 3 from the road surface 1 and the underground buried pipe 2 is first secured. Next, the inside of the shaft is dug down to form a shaft 4, and the steel sheet pile 3 is attached to the mountain retaining material 5.
To prevent ground collapse. Then, underground pipe 2
It is common to remove and backfill after removal. Further, the existing buried pipe 6 which is not removed but is exposed in the shaft 4 is hung by the mountain retaining member 5 and is hung by the protection member 7 to be protected.
【０００３】[0003]
【発明が解決しようとする課題】近年、新設の大口径シ
ールドトンネルが地下深部に計画されることが多くなる
に従い、地下深部の既設埋設管を撤去する必要が生じて
きた。しかしながら、上記従来の既設埋設管の撤去工法
は、埋設管が浅いうちは良いが、地下深い埋設管の撤去
に対しては次のような種々の問題点があった。In recent years, as new large-diameter shield tunnels are often planned deep underground, it has become necessary to remove existing buried pipes deep underground. However, the above-mentioned conventional method of removing existing buried pipes is good when the buried pipes are shallow, but there are various problems as follows when removing buried pipes deep underground.
【０００４】山留が深くなり工事費が高くなる。工
事中、道路を専有するため交通渋滞につながる。より
浅い所にある他の埋設管を防護しなくてはならない場合
が多い。そこで、この発明は、上記従来の問題点に着目
してなされたものであり、既設埋設管をシールド工法を
利用して撤去するようにした既設トンネル撤去シールド
機を提供することにより従来の問題点を解決することを
目的とする。[0004] The depth of the mountain is deep and the construction cost is high. During construction, the road will be occupied and traffic congestion will occur. Often, other buried pipes in shallower locations must be protected. Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and provides an existing tunnel removal shield machine that removes an existing buried pipe by using a shield method, thereby providing a conventional problem. The purpose is to solve.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成する本
発明は、後端が隔壁により蓋され前端に撤去すべき既設
管の端部が内挿される開口を有する一個の筒状の殻体
と、前記殻体前端の開口の外周に配設され既設管の外周
の地山を掘削する回転カッタヘッドを備えた掘削手段
と、前記殻体の掘進手段と、前記殻体内において回転カ
ッタヘッドの切羽側から軸方向に配設され後端の隔壁を
貫通して外部に開口し、回転カッタヘッドの掘削土を隔
壁後方に形成される既設トンネル撤去後の外部空間に埋
土として排出する掘削土搬送手段とを少なくとも備えて
いる。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a single cylindrical shell having an opening through which the rear end is covered by a partition and into which the end of an existing pipe to be removed is inserted. When the drilling unit having a rotary cutter head for drilling rock mass of the outer periphery of the outer peripheral disposed existing pipes of the opening of the shell body front end, a boring means of the shell, the rotary cutter head in said shell body disposed from the working face side in the axial direction through the rear end of the partition wall open to the outside, septum the excavated soil rotary cutter head
Buried in the external space after removal of the existing tunnel formed behind the wall
At least excavated soil transport means for discharging as soil.
【０００６】[0006]
【作用】掘進手段で殻体を前進させながら殻体に取付け
た回転カッタヘッドを回転させて既設管の外周を掘削す
る。掘削土は、搬送手段で殻体後部の隔壁外に運び出し
て、既設管撤去後の埋め戻しに使う。所定距離の掘削を
おこなった後に、殻体内部に取り込んだ既設管の端部を
除去する。上記のようにして、既設管外周の掘削と殻体
の掘進と既設管の端部の除去を繰り返すことで、地下の
既設管の撤去と埋め戻しをシールド方式で行うことがで
きる。The outer periphery of the existing pipe is excavated by rotating the rotary cutter head attached to the shell while advancing the shell with the excavating means. The excavated soil is transported out of the bulkhead at the rear of the shell by transport means and used for backfilling after removing existing pipes. After excavating a predetermined distance, the end of the existing pipe taken into the shell is removed. As described above, by repeatedly excavating the outer periphery of the existing pipe, excavating the shell, and removing the end of the existing pipe, the existing pipe underground can be removed and backfilled by the shield method.
【０００７】[0007]
【実施例】以下、本発明の実施例を図面を参照して説明
する。図１は、本発明の一実施例の断面図である。既設
トンネル撤去シールド機１０は、後端が隔壁１２により
蓋され、前端は開口１３を有する筒状の殻体１４と、殻
体の開口１３の外周に配設された回転カッタヘッド１５
およびその駆動用モータ１６からなる掘削手段１７と、
この掘削手段１７を殻体１４と共に前進させる掘進手段
１８と、掘削した残土を切羽側から後方に搬送し後部の
隔壁を貫通して外部の埋め戻し空間に排出するため殻体
１４内に配設された掘削土搬送手段１９とを少なくとも
備えている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of one embodiment of the present invention. The existing tunnel removal shield machine 10 has a cylindrical shell 14 having a rear end covered with a partition wall 12 and an opening 13 at a front end, and a rotary cutter head 15 disposed on the outer periphery of the opening 13 of the shell.
And a digging means 17 comprising a driving motor 16 thereof,
A digging means 18 for advancing the digging means 17 together with the shell 14 and a shell 14 for transporting the excavated residual soil from the face side to the rear and passing through the rear partition to the backfill space outside are provided. And at least excavated soil conveying means 19.
【０００８】前記の殻体１４は、比較的長い外筒１４Ａ
と短い内筒１４Ｂとからなり、両筒１４Ａ，１４Ｂは前
端部で前部隔壁２１を介して一体に連結されている。内
筒１４Ｂの内径は、既設管２の外径との間にシール材２
２が介装し得る大きさである。外筒１４Ａの内径は、内
筒１４Ｂとの間に回転カッタヘッドの駆動用モータ１６
や掘削土搬送手段１９等の取付けスペースが確保できる
大きさである。The shell 14 has a relatively long outer cylinder 14A.
And the short inner cylinder 14B. The two cylinders 14A and 14B are integrally connected via a front partition 21 at a front end. The inner diameter of the inner cylinder 14B is between the outer diameter of the existing pipe 2 and the sealing material 2.
2 is a size that can be interposed. The inner diameter of the outer cylinder 14A is between the inner cylinder 14B and the motor 16 for driving the rotary cutter head.
It is a size that can secure a mounting space for the excavated soil transfer means 19 and the like.
【０００９】前記の掘削手段１７の回転カッタヘッド１
５はリング形状で、殻体１４の開口１３の外周部分に図
外のベアリングを介して回転自在に配設されており、ヘ
ッド前面に多数のビット１５ａを有し、ヘッド後面と前
部隔壁２０との間にカッタチャンバ２３が形成されてい
る。その回転カッタヘッド１５の駆動用モータ１６は外
筒１４Ａの内壁に固定され、出力ギア２４を介して回転
カッタヘッド１５を回転駆動する。The rotary cutter head 1 of the excavating means 17
Reference numeral 5 denotes a ring shape, which is rotatably disposed on the outer peripheral portion of the opening 13 of the shell 14 via a bearing (not shown), has a large number of bits 15a on the front surface of the head, and has a rear surface of the head and a front partition wall 20. And a cutter chamber 23 is formed. A drive motor 16 for the rotary cutter head 15 is fixed to the inner wall of the outer cylinder 14A, and drives the rotary cutter head 15 via an output gear 24 to rotate.
【００１０】前記の掘進手段１８としては、既設管２の
内面にグリッパ２５を介して着脱自在に取付けた複数台
の牽引ジャッキ又は牽引ウインチ１８ａが用いられてい
る。牽引ワイヤ１８ｂは、掘進時に殻体１４の後端の隔
壁１２に係止される。前記の掘削土搬送手段１９はスク
リュウコンベアであり、カッタチャンバ２３を仕切る殻
体１４の前部隔壁２１と後端の隔壁１２とを貫通して配
設された貫通管１９ａを通してカッタチャンバ２３と外
部の埋め戻しスペースＧとが連通している。駆動モータ
１９ｂにより駆動されるスクリュウコンベア１９は、殻
体１４の下半部に複数本が装備されている。As the excavating means 18, a plurality of tow jacks or tow winches 18a which are removably attached to the inner surface of the existing pipe 2 via grippers 25 are used. The pulling wire 18b is locked to the partition wall 12 at the rear end of the shell 14 during excavation. The excavated soil conveying means 19 is a screw conveyor, and is connected to the cutter chamber 23 through a through-tube 19a provided through the front partition 21 and the rear partition 12 of the shell 14 partitioning the cutter chamber 23. And the back-filled space G is connected. A plurality of screw conveyors 19 driven by the drive motor 19b are provided in the lower half of the shell 14.
【００１１】この実施例の既設トンネル撤去シールド機
１０は、既設トンネルの破砕手段としてのコンクリート
カッタ装置３０を備えている。このコンクリートカッタ
装置３０は、旋回モータ３１で旋回駆動されるとともに
前後に移動可能に図示しないエレクタ装置で支持された
旋回リング３２に取付けられている。なお、図１にはコ
ンクリートカッタ装置３０として既設管２を輪切りにす
るもののみを示しているが、既設管２を軸方向に切断す
るものも旋回リング３２に取付け、併用してもよい。The existing tunnel removing shield machine 10 of this embodiment includes a concrete cutter device 30 as a means for crushing the existing tunnel. The concrete cutter device 30 is mounted on a turning ring 32 supported by an unillustrated erector device so as to be turned and driven by a turning motor 31 and to be movable back and forth. Although FIG. 1 shows only the concrete cutter device 30 that cuts the existing pipe 2 in a ring shape, the concrete cutter device 30 that cuts the existing pipe 2 in the axial direction may be attached to the turning ring 32 and used together.
【００１２】３３は、既設トンネル撤去シールド機１０
の掘進で後方に形成された空間を埋め戻すために用いる
モルタル系埋土材の注入管であり、この注入管３３は既
設管２内を通り隔壁１２を貫通して開口している。次に
作用を説明する。この既設トンネル撤去シールド機１０
を用いた施工手順は、つぎの通りである。Reference numeral 33 denotes an existing tunnel removal shield machine 10
Is an injection pipe of a mortar-based embedding material used for backfilling a space formed behind by excavation. The injection pipe 33 passes through the existing pipe 2 and opens through the partition wall 12. Next, the operation will be described. This existing tunnel removal shield machine 10
Is as follows.
【００１３】先ず、既設管２の撤去箇所の始点Ａと終
点Ｂとに立坑４，４を設置する。 山留杭３を打設し、既設管２が邪魔になって山留杭３の
打設ができなかった箇所には地盤改良Ｃを施してから内
部を掘削する（図２）。 始点Ａの立坑４内で既設トンネル撤去シールド機１０
を組み立てて、既設管２の撤去部分の始端を機械内部に
取り込む（図３）。First, the shafts 4 and 4 are installed at the starting point A and the ending point B of the location where the existing pipe 2 is removed. The piles 3 are cast, and the existing pipe 2 is in the way, and the places where the piles 3 could not be cast were subjected to ground improvement C and then the inside was excavated (FIG. 2). Existing tunnel removal shield machine 10 in shaft 4 at starting point A
Is assembled, and the starting end of the removed portion of the existing pipe 2 is taken into the machine (FIG. 3).
【００１４】始点Ａの立坑４の内部空間を砂，埋土Ｆ
で埋め戻し、山留杭３を引き抜く（図４）。外部と既設
トンネル撤去シールド機１０内との間で行われる物や人
の出入りには、終点Ｂの立坑４を利用する。 既設管２を壊しながら、終点Ｂの立坑４の側に向かっ
て既設トンネル撤去シールド機１０を推進させる（図
５）。The interior space of the shaft 4 at the starting point A is sand,
And the mountain pile 3 is pulled out (FIG. 4). The shaft 4 at the end point B is used for entry and exit of objects and people between the outside and the inside of the existing tunnel removal shield machine 10. While breaking the existing pipe 2, the existing tunnel removal shield machine 10 is propelled toward the shaft 4 at the end point B (FIG. 5).
【００１５】すなわち、既設トンネル撤去シールド機１
０の掘進手段１８の牽引ジャッキ１８ａを、予めグリッ
パ２５で既設管２の内面に固定しておき、牽引ワイヤ１
８ｂは殻体の後端の隔壁１２に係止させる。そして、牽
引ジャッキ１８ａで殻体１４を牽引しつつ掘削手段１７
の回転カッタヘッド１５を回転させて、ビット１５ａで
既設管２の外周部の地山Ｅを掘削する。カッタチャンバ
２３内に溜まる掘削土は、スクリュウコンベア１９によ
り隔壁１２の後方に形成された既設トンネル撤去後の埋
め戻しスペースＧに搬送されて、埋土Ｆとして利用され
る。この掘削土のみでは不足するので、埋土Ｆの不足分
は注入管３３を用いてモルタル系埋土材を埋め戻しスペ
ースＧに注入することにより補われる。That is, the existing tunnel removal shield machine 1
The traction jack 18a of the excavating means 18 is fixed to the inner surface of the existing pipe 2 by a gripper 25 in advance, and the traction wire 1
8b is engaged with the partition 12 at the rear end of the shell. The digging means 17 is pulled while the shell 14 is pulled by the towing jack 18a.
Is rotated to excavate the ground E on the outer peripheral portion of the existing pipe 2 with the bit 15a. The excavated soil accumulated in the cutter chamber 23 is transported by the screw conveyor 19 to the backfill space G formed after the removal of the existing tunnel formed behind the partition 12 and used as the embedded soil F. Since this excavated soil alone is insufficient, the shortage of the embedded soil F is compensated by injecting the mortar-based embedding material into the backfill space G using the injection pipe 33.
【００１６】ある程度の距離を掘削したら、掘削手段１
７と掘進手段１８の運転を停止し、牽引ワイヤ１８ｂは
殻体の隔壁１２から外す。つづいてコンクリートカッタ
装置３０を運転するとともに旋回リング３２を駆動し
て、殻体１４の内部において既設管２の端部を所定長さ
だけ切除し、運搬可能なサイズのブロックに分断する。
分断したブロックは、既設管２の内部に設けられている
図示しない搬出装置で運び出し、終点Ｂの立坑４から外
部に排出する。After excavating a certain distance, the excavating means 1
7 and the operation of the excavating means 18 are stopped, and the pulling wire 18b is removed from the partition 12 of the shell. Subsequently, the concrete cutter device 30 is operated, and at the same time, the swivel ring 32 is driven to cut off the end of the existing pipe 2 by a predetermined length inside the shell 14, and cut into blocks of a size that can be transported.
The divided block is carried out by a carrying-out device (not shown) provided inside the existing pipe 2 and discharged from the shaft 4 at the end point B to the outside.
【００１７】以上の動作を繰り返すことにより、始点Ａ
の立坑４から終点Ｂの立坑４に至る部分の既設管２を撤
去するとともに、撤去後の空間を埋め戻すことができ
る。なお、上記の実施例においては、既設管２の破砕手
段として、殻体１４に内蔵されたコンクリートカッタ装
置３０を用いたものを説明したが、必ずしもこのような
自動機械に頼る必要はなく、人力で操作する機械を用い
ることもできる。またセグメントが露出している場合
は、ボルト等を外すことで撤去可能であり、コンクリー
トを切断する手間を省くことができ、コンクリートカッ
タ装置３０は不要である。By repeating the above operation, the starting point A
The existing pipe 2 at the portion from the shaft 4 at the end point B to the shaft 4 at the end point B can be removed, and the space after the removal can be backfilled. In the above-described embodiment, the concrete pipe cutter 30 using the concrete cutter device 30 built in the shell 14 has been described as a means for crushing the existing pipe 2. However, it is not always necessary to rely on such an automatic machine. It is also possible to use a machine operated by. When the segments are exposed, they can be removed by removing bolts and the like, so that the labor for cutting concrete can be omitted, and the concrete cutter device 30 is unnecessary.
【００１８】また、既設トンネル撤去シールド機１０で
撤去することができる既設管２は、コンクリート管に限
らず、鋼管や煉瓦製の管などでもよい。The existing pipe 2 that can be removed by the existing tunnel removal shield machine 10 is not limited to a concrete pipe, but may be a steel pipe or a brick pipe.
【００１９】[0019]
【発明の効果】以上説明したように、本発明の既設トン
ネル撤去シールド機は、撤去すべき既設管の端部に取付
けられて、内部に取り込んだ既設管の端部を壊すととも
に、前部に設けた回転カッタヘッドで、既設管の外周の
地殻を掘削しつつ既設管の内部から牽引して掘進し、掘
削土は殻体内に設けた搬送手段で既設トンネル撤去後の
外部空間に排出して埋め戻しに用いるものとした。その
ため、次のような効果が得られる。As described above, the existing tunnel removing shield machine of the present invention is attached to the end of the existing pipe to be removed, and breaks the end of the existing pipe taken into the inside, and at the front, With the provided rotating cutter head, while excavating the crust around the existing pipe, it is pulled from the inside of the existing pipe and excavated, and the excavated soil is discharged to the external space after removal of the existing tunnel by the transport means provided in the shell body It was used for backfilling. Therefore, the following effects can be obtained.
【００２０】掘削土を地表にまで搬出する必要はな
く、掘削土処理設備や大掛かりな運搬設備が不要となり
経済的である。 地中作業であるから、工事中に道路が専有されること
がなく、道路交通を妨げない。 山留工事で工事費が嵩むようなこともなく、又浅い所
にある他の埋設管を護する必要もないから工事費が節減
できる。It is not necessary to carry out the excavated soil to the surface of the ground, so that excavated soil treatment equipment and large-scale transport equipment are not required, so that it is economical. Because it is underground work, roads are not occupied during construction and road traffic is not obstructed. The construction cost can be reduced because the construction cost does not increase due to the shoring work, and there is no need to protect other buried pipes in shallow places.
【００２１】既設管の撤去を目で直接に確認でき、確
実である。The removal of the existing pipe can be confirmed directly with the eyes, and it is reliable.
【図１】本発明の一実施例を模式的に示す断面図であ
る。FIG. 1 is a sectional view schematically showing one embodiment of the present invention.
【図２】図１に示す既設トンネル撤去シールド機による
施工手順説明図である。FIG. 2 is an explanatory view of a construction procedure using an existing tunnel removal shield machine shown in FIG. 1;
【図３】同じく施工手順説明図である。FIG. 3 is an explanatory view of a construction procedure.
【図４】同じく施工手順説明図である。FIG. 4 is an explanatory view of a construction procedure.
【図５】同じく施工手順説明図である。FIG. 5 is an explanatory view of a construction procedure.
【図６】従来の既設トンネル撤去工事の一例を説明する
図である。FIG. 6 is a diagram illustrating an example of a conventional existing tunnel removal work.
１０ 既設トンネル撤去シールド機 １２ 隔壁 １３ 開口 １４ 殻体 １５ 回転カッタヘッド １７ 掘削手段 １８ 掘進手段 １９ 掘削土搬送手段（スクリュウコンベア） DESCRIPTION OF SYMBOLS 10 Existing tunnel removal shield machine 12 Partition wall 13 Opening 14 Shell body 15 Rotating cutter head 17 Drilling means 18 Drilling means 19 Excavated soil conveying means (screw conveyor)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平地 正憲 東京都新宿区西新宿一丁目25番１号 大 成建設株式会社内 (56)参考文献 特開 平２−157400（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) E21F 15/00 E21D 9/06 301 E21D 9/06 311 E21D 9/08 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Masanori Hirachi 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation (56) References JP-A-2-157400 (JP, A) (58 ) Field surveyed (Int.Cl. 7 , DB name) E21F 15/00 E21D 9/06 301 E21D 9/06 311 E21D 9/08
Claims (1)
き既設管の端部が内挿される開口を有する一個の筒状の
殻体と、前記殻体前端の開口の外周に配設され既設管の
外周の地山を掘削する回転カッタヘッドを備えた掘削手
段と、前記殻体の掘進手段と、前記殻体内において回転
カッタヘッドの切羽側から軸方向に配設され後端の隔壁
を貫通して外部に開口し、回転カッタヘッドの掘削土を
隔壁後方に形成される既設トンネル撤去後の外部空間に
埋土として排出する掘削土搬送手段とを少なくとも備え
た既設トンネル撤去シールド機。1. A tubular shell having an opening through which a rear end is covered by a partition wall and into which an end of an existing pipe to be removed at a front end is inserted, and which is disposed on an outer periphery of the opening at the front end of the shell. and drilling means having a rotary cutter head for drilling rock mass of the outer circumference of the existing pipe, and excavation means of the shell, the partition wall of the rear end is disposed axially from the working face side of the rotary cutter head in said shell body Penetrate and open to the outside, excavated soil from the rotating cutter head
In the external space after removal of the existing tunnel formed behind the bulkhead
An existing tunnel removal shield machine comprising at least excavated soil transport means for discharging as buried soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04132627A JP3137731B2 (en) | 1992-05-25 | 1992-05-25 | Existing tunnel removal shield machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04132627A JP3137731B2 (en) | 1992-05-25 | 1992-05-25 | Existing tunnel removal shield machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05321600A JPH05321600A (en) | 1993-12-07 |
| JP3137731B2 true JP3137731B2 (en) | 2001-02-26 |
Family
ID=15085750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04132627A Expired - Fee Related JP3137731B2 (en) | 1992-05-25 | 1992-05-25 | Existing tunnel removal shield machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3137731B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4798381B2 (en) * | 2007-02-20 | 2011-10-19 | 清水建設株式会社 | Shield tunnel and its construction method, backfilling method, building / backfilling method |
-
1992
- 1992-05-25 JP JP04132627A patent/JP3137731B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05321600A (en) | 1993-12-07 |
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