JP2520958Y2 - Cooling device for equipment used for tunnel construction - Google Patents
Cooling device for equipment used for tunnel constructionInfo
- Publication number
- JP2520958Y2 JP2520958Y2 JP1990071269U JP7126990U JP2520958Y2 JP 2520958 Y2 JP2520958 Y2 JP 2520958Y2 JP 1990071269 U JP1990071269 U JP 1990071269U JP 7126990 U JP7126990 U JP 7126990U JP 2520958 Y2 JP2520958 Y2 JP 2520958Y2
- Authority
- JP
- Japan
- Prior art keywords
- tunnel
- heat
- low temperature
- water tank
- temperature water
- 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
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、トンネル工事に使用する機器の冷却装置に
関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cooling device for equipment used in tunnel construction.
従来、トンネル特に都市トンネルは温度が高い。そし
て、トンネルを掘削するシールド式トンネル掘削機内に
は、各種の油圧モータなどの熱を発生する機器が設置さ
れている。また、シールド式トンネル掘削機に後続する
数台の台車上にも、パワーユニットなど熱を発生する機
器が搭載されている。さらに、シールド式トンネル掘削
機の連続運動や坑内湧水のため、シールド式トンネル掘
削機の切羽近傍は、30℃を越す高温・高湿状態となる。Conventionally, tunnels, especially city tunnels, have high temperatures. Inside the shield tunnel excavator for excavating the tunnel, various heat generating devices such as hydraulic motors are installed. In addition, devices that generate heat, such as a power unit, are also mounted on several trucks that follow the shield tunnel excavator. Furthermore, due to the continuous movement of the shield tunnel excavator and the spring water in the mine, the vicinity of the face of the shield tunnel excavator becomes hot and humid, exceeding 30 ° C.
そこで、従来トンネル内に送風管で送風して換気を行
っている。Therefore, ventilation is conventionally performed by blowing air into the tunnel with a blower pipe.
前記トンネル内に送風管で送風して換気を行う手段
は、シールド式トンネル掘削機内に各種の機器が多数設
置されているので、送風管をシールド式トンネル掘削機
内にまで設置することは困難であり、シールド式トンネ
ル掘削機内を低温化することができなかった。Since a lot of various devices are installed in the shield type tunnel excavator, the means for ventilating the inside of the tunnel with the blower pipe is difficult to install even in the shield type tunnel excavator. , The temperature inside the shield tunnel excavator could not be lowered.
本考案は、前記事項に鑑みなされたものであり、シー
ルド式トンネル掘削機内を低温化できるようにすること
を技術的課題とする。The present invention has been made in view of the above-mentioned matters, and has a technical problem to make it possible to lower the temperature inside a shield tunnel excavator.
本考案はトンネル工事に使用する機器の冷却装置であ
り、トンネル22内に設置する低温水槽17と、前記トンネ
ル22内に設置され、トンネル工事用の熱を発生する機器
32を収容する密閉筺体35と、前記トンネル22外に設置さ
れ、送水管16、16で前記低温水槽17に接続されたクーラ
15と、一端に凝縮部８が且つ他端に蒸発部10が形成さ
れ、前記一端の前記凝縮部８を前記低温水槽17内に挿入
し、前記他端の蒸発部10を前記密閉筺体35内に挿入して
設置されたヒートパイプ１とを含み、前記ヒートパイプ
１を介して前記密閉筺体35内の機器32からの熱を前記低
温水槽17に伝達し、前記クーラ15で冷却された熱交換媒
体を前記低温水槽17に循環させて前記熱を前記トンネル
22外に排出するようにしたことを特徴とする。The present invention is a cooling device for equipment used in tunnel construction, such as a low temperature water tank 17 installed in the tunnel 22 and equipment for generating heat for tunnel construction installed in the tunnel 22.
A closed casing 35 accommodating 32, and a cooler installed outside the tunnel 22 and connected to the low temperature water tank 17 by water supply pipes 16 and 16.
15, a condensing part 8 at one end and an evaporating part 10 at the other end are formed, the condensing part 8 at the one end is inserted into the low temperature water tank 17, and the evaporating part 10 at the other end is inside the closed casing 35. And a heat pipe 1 installed by being installed in the heat exchanger 1, the heat from the device 32 in the closed casing 35 is transferred to the low temperature water tank 17 via the heat pipe 1, and the heat exchange cooled by the cooler 15 is performed. The heat is circulated in the tunnel by circulating the medium in the low temperature water tank 17.
22 It is characterized by being discharged to the outside.
この場合、ヒートパイプ１の蒸発部10が挿入された密
閉筺体35を、シールド式トンネル掘削機30内に設置して
もよい。また、シールド式トンネル掘削機内の熱発生機
器32を密閉筺体で囲うことなく、ヒートパイプ１の蒸発
部10を前記機器32に直接接触させ、当該機器32の熱をヒ
ートパイプ１を介して低温水槽17とクーラ15とを循環す
る熱交換媒体に伝達するようにしてもよい。In this case, the closed casing 35 in which the evaporation portion 10 of the heat pipe 1 is inserted may be installed in the shield tunnel excavator 30. In addition, the heat generation device 32 in the shield tunnel excavator is not surrounded by a hermetically sealed enclosure, but the evaporation part 10 of the heat pipe 1 is brought into direct contact with the device 32, and the heat of the device 32 is passed through the heat pipe 1 to a low temperature water tank. Alternatively, the heat may be transferred to the heat exchange medium that circulates between 17 and the cooler 15.
本件のトンネル内に設置する密閉筺体35を設ける考案
は、クーラ15で冷却した低温水を、低温水槽17に送水管
16で送水し、温度の上昇した水を別の送水管16でクーラ
15に戻し循環させる。The idea of providing a closed casing 35 to be installed in the tunnel of this case is to feed the low temperature water cooled by the cooler 15 to the low temperature water tank 17
Water is sent in 16, and the water whose temperature has risen is cooled by another water pipe 16.
Return to 15 and circulate.
そして、前記低温水槽17に挿入されたヒートパイプ１
の凝縮部８は、低温水によって冷却され、凝縮部８内の
作動流体は、冷却されて凝縮し液化する。And the heat pipe 1 inserted in the low temperature water tank 17
The condensing part 8 is cooled by low temperature water, and the working fluid in the condensing part 8 is cooled, condensed and liquefied.
凝縮部８で凝縮した作動流体は、ヒートパイプ１内の
毛細管構造体３に吸収され、毛細管構造体３内を毛細管
現象により蒸発部10に移動する。The working fluid condensed in the condenser unit 8 is absorbed by the capillary structure 3 in the heat pipe 1 and moves to the evaporation unit 10 in the capillary structure 3 by the capillary phenomenon.
また、密閉筺体35内の空気は、密閉筺体35内に収容さ
れた熱を発生する機器32によって、温度が上昇する。そ
して、この密閉筺体35内の空気に接したヒートパイプ１
の蒸発部10内の作動流体は、前記空気の熱を吸収して蒸
発し、密閉筺体35内の空気を冷却する。The temperature of the air inside the closed casing 35 rises due to the heat-generating device 32 housed inside the closed casing 35. Then, the heat pipe 1 which is in contact with the air in the closed casing 35
The working fluid in the evaporation unit 10 absorbs the heat of the air and evaporates to cool the air in the closed casing 35.
さらに、ヒートパイプ１の蒸発部10で蒸発した作動流
体は、凝縮部８に移動し、低温水槽17内で冷却され、再
び凝縮する。Further, the working fluid evaporated in the evaporator 10 of the heat pipe 1 moves to the condenser 8, is cooled in the low temperature water tank 17, and is condensed again.
そして、熱を発生する機器32は、近傍に熱を放出しな
い。Then, the device 32 that generates heat does not release the heat to the vicinity.
また、ヒートパイプ１の蒸発部10が挿入された密閉筺
体35を、シールド式トンネル掘削機30内に設置したもの
は、各種の機器が設置され狭いシールド式トンネル掘削
機30内の熱を発生する機器32の熱を、小径に形成される
ヒートパイプ１でシールド式トンネル掘削機30の外に取
り出すものである。Further, when the sealed casing 35 in which the evaporation portion 10 of the heat pipe 1 is inserted is installed in the shield tunnel excavator 30, various devices are installed and heat is generated in the narrow shield tunnel excavator 30. The heat of the device 32 is taken out of the shield tunnel excavator 30 by the heat pipe 1 having a small diameter.
さらに、ヒートパイプ１の蒸発部10を、熱を発生する
機器32に接触させる考案は、熱を発生する機器32の熱
が、ヒートパイプ１の蒸発部10に直接伝達される。Furthermore, in the device in which the evaporation unit 10 of the heat pipe 1 is brought into contact with the device 32 that generates heat, the heat of the device 32 that generates heat is directly transmitted to the evaporation unit 10 of the heat pipe 1.
第１図及び第２図は、トンネル22内に密閉筺体35を設
けるトンネル工事に使用する機器の冷却装置の考案の一
実施例の説明用の図で、第３図はヒートパイプの一実施
例を示す図である。1 and 2 are views for explaining an embodiment of a device for cooling a device used for tunnel construction in which a closed casing 35 is provided in the tunnel 22, and FIG. 3 is an embodiment of a heat pipe. FIG.
この実施例は、トンネル22の台車40上に設置する低温
水槽17と、この低温水槽17に隣接する密閉筺体35が設け
てある。In this embodiment, a low temperature water tank 17 installed on a carriage 40 of the tunnel 22 and a closed casing 35 adjacent to the low temperature water tank 17 are provided.
前記低温水槽17は、トンネル22から立坑23に配設した
２本の送水管16,16で地上に設置したクーラ15と接続し
てあり、クーラ15で冷却された低温水を、低温水槽17に
循環して供給できるように形成してある。The low-temperature water tank 17 is connected to the cooler 15 installed on the ground by two water pipes 16 and 16 arranged in the tunnel 23 from the tunnel 22, and the low-temperature water cooled by the cooler 15 is supplied to the low-temperature water tank 17. It is formed so that it can be circulated and supplied.
そして、密閉筺体35内には、工事用の熱を発生する機
器32の一種である可変速モータが収容されている。A variable speed motor, which is a kind of the device 32 that generates heat for construction, is housed in the closed casing 35.
さらに、前記低温水槽17内にヒートパイプ１の凝縮部
８を挿入し、このヒートパイプ１の蒸発部10を、前記熱
を発生する機器32を収容した密閉筺体35内に挿入したも
のである。Further, the condensing part 8 of the heat pipe 1 is inserted into the low temperature water tank 17, and the evaporating part 10 of the heat pipe 1 is inserted into the hermetically sealed casing 35 accommodating the device 32 for generating the heat.
そして、この実施例で使用するヒートパイプ１は、第
３図に示すように、金属管で形成された密閉容器２を備
えており、この密閉容器２の内周面には、毛細管構造体
３が張設してある。As shown in FIG. 3, the heat pipe 1 used in this embodiment is provided with a closed container 2 formed of a metal tube, and the capillary structure 3 is provided on the inner peripheral surface of the closed container 2. Is stretched.
そして、このヒートパイプ１は一方が凝縮部８とな
り、他方が蒸発部10となっている。One of the heat pipes 1 is the condensing part 8 and the other is the evaporating part 10.
さらに、この凝縮部８と蒸発部10の間の密閉容器２と
毛細管構造体３間に断熱材４を介挿させた断熱部９が設
けてある。Further, a heat insulating section 9 having a heat insulating material 4 interposed between the closed vessel 2 and the capillary structure 3 between the condenser section 8 and the evaporation section 10 is provided.
そして、前記ヒートパイプ１内には、脱気した後、ア
セトン、メタノール、エタノール、その他の作動流体が
封入されている。After degassing, the heat pipe 1 is filled with acetone, methanol, ethanol, and other working fluids.
そして、前記送水管16,16は可撓管等を使用して、一
定の距離内は台車40が前進できるように形成し、それ以
上の距離まで台車が移動するには、送水管16,16を継ぎ
足すようにする。Then, the water pipes 16, 16 are formed by using flexible pipes or the like so that the truck 40 can move forward within a certain distance, and the water pipes 16, 16 are required to move the truck to a further distance. Be added.
第４図は、ヒートパイプ１の蒸発部10が挿入された密
閉筺体35を、シールド式トンネル掘削機30内に設置した
トンネル工事に使用する機器の冷却装置の一実施例を示
すものであり、以下さきに述べた実施例の記載と同様の
部分は同一の符号を用い説明を省略した。FIG. 4 shows an embodiment of a cooling device for equipment used for tunnel construction in which a closed casing 35 in which the evaporation portion 10 of the heat pipe 1 is inserted is installed in a shield tunnel excavator 30. The same parts as those described in the above-described embodiments are designated by the same reference numerals and the description thereof is omitted.
この実施例は、密閉筺体35をシールド式トンネル掘削
機30の前部の外殻体31A内に設置し、この密閉筺体35内
に、熱を発生する機器32の一種であるカッター駆動用モ
ータを収容した。In this embodiment, the closed casing 35 is installed in the outer shell 31A of the front part of the shield tunnel excavator 30, and in this closed casing 35, a cutter driving motor that is a kind of the device 32 that generates heat is installed. Accommodated.
そして、低温水槽17にはシールド式トンネル掘削機30
の後部の外殻体31B内に設置し、ヒートパイプ１は、低
温水槽17内に前後に摺動できるように挿入したものであ
るが、このヒートパイプ１は、低温水槽17に固定して挿
入し、低温水槽17も前部の外殻体31A内に設置し、送水
管16,16が前方に伸びることができるように形成しても
よい。And, in the low temperature water tank 17, a shield tunnel excavator 30
The heat pipe 1 is installed in the outer shell 31B at the rear part and inserted into the low temperature water tank 17 so as to be slidable back and forth. The heat pipe 1 is fixedly inserted into the low temperature water tank 17. However, the low temperature water tank 17 may also be installed in the front outer shell body 31A so that the water pipes 16 and 16 can extend forward.
さらに、前記低温水槽17は、シールド式トンネル掘削
機30の後部のトンネル22内に設けることも可能である。
この場合も当然のこととして、低温水槽17に対して、ヒ
ートパイプ１が前後に摺動できるように形成し、低温水
槽17もトンネル22内を前進できるように形成する。Further, the low temperature water tank 17 can be provided in the tunnel 22 at the rear of the shield tunnel excavator 30.
In this case, as a matter of course, the heat pipe 1 is formed so as to be slidable forward and backward with respect to the low temperature water tank 17, and the low temperature water tank 17 is also formed so as to be able to advance in the tunnel 22.
第５図及び第６図は、ヒートパイプ１の蒸発部10を熱
を発生する機器32に接触させるトンネル工事に使用する
機器の冷却装置の一実施例を示すものである。FIG. 5 and FIG. 6 show an embodiment of a cooling device for equipment used for tunnel construction in which the evaporator 10 of the heat pipe 1 is brought into contact with equipment 32 that generates heat.
この実施例は、ヒートパイプ１の蒸発部10を、弧状に
湾曲した板状に形成し、この蒸発部10を、直接に熱を発
生する機器32の外表面に接触させて設けたものである。In this embodiment, the evaporation part 10 of the heat pipe 1 is formed in a plate shape curved in an arc shape, and the evaporation part 10 is provided in direct contact with the outer surface of the device 32 that generates heat. .
本考案は、トンネル工事に使用する熱を発生する機器
32を、密閉筺体35内に収容し、この密閉筺体35内にヒー
トパイプ１の蒸発部10を挿入し、ヒートパイプ１の凝縮
部８を低温水槽17内に挿入したものである。The present invention is a device for generating heat used for tunnel construction.
32 is housed in a closed casing 35, the evaporation unit 10 of the heat pipe 1 is inserted into the closed casing 35, and the condensation unit 8 of the heat pipe 1 is inserted into the low temperature water tank 17.
そして、熱を発生する機器32が放出する熱をヒートパ
イプ１で低温水に伝えて、クーラ15から放出するように
したので、熱を発生する機器32から、トンネル22内、及
び、シールド式トンネル掘削機30内に熱が放出されるの
を防ぐことができる。Then, the heat emitted from the device 32 that generates heat is transmitted to the low temperature water by the heat pipe 1 so as to be emitted from the cooler 15. Therefore, the device 32 that generates the heat, the tunnel 22 and the shield tunnel It is possible to prevent heat from being released into the excavator 30.
そして、ヒートパイプ１の凝縮部８から蒸発部10まで
冷熱を運ぶのは、液状の作動流体であって、ヒートパイ
プ１は小径であるので、各種の機器が設置されていて極
めて狭いシールド式トンネル掘削機30に設置することが
容易である。And, it is the liquid working fluid that carries the cold heat from the condensing part 8 to the evaporating part 10 of the heat pipe 1, and since the heat pipe 1 has a small diameter, various equipments are installed and the shield tunnel is extremely narrow. It is easy to install on the excavator 30.
さらに、ヒートパイプ１の蒸発部10を直接熱を発生す
る機器32に接触させたものは、一層狭い所でも設置でき
る。Further, the evaporator 10 of the heat pipe 1 in direct contact with the device 32 for generating heat can be installed in a narrower place.
第１図はトンネル内に密閉筺体を設けるトンネル工事に
使用する機器の冷却装置の一実施例の説明用の一部断面
とした側面図、第２図はその要部を拡大して示す側面
図、第３図はヒートパイプを拡大して一部破砕した断面
図、第４図は密閉筺体をシールド式トンネル掘削機内に
設置したトンネル工事に使用する機器の冷却装置の一実
施例の説明用の一部断面とした側面図、第５図はヒート
パイプの蒸発部を機器に接触させたトンネル工事に使用
する機器の冷却装置の一実施例の説明用の一部断面とし
た側面図、第６図はその要部の斜視図である。 １……ヒートパイプ、８……凝縮部、10……蒸発部、15
……クーラ、16……送水管、17……低温水槽、22……ト
ンネル、30……シールド式トンネル掘削機、32……熱を
発生する機器、35……密閉筺体。FIG. 1 is a side view with a partial cross section for explaining an embodiment of a cooling device for equipment used in tunnel construction in which a closed casing is provided in the tunnel, and FIG. 2 is a side view showing an enlarged main part thereof. FIG. 3 is a sectional view in which a heat pipe is enlarged and partially crushed, and FIG. 4 is an illustration of an embodiment of a cooling device for equipment used for tunnel construction in which a closed casing is installed in a shield tunnel excavator. FIG. 5 is a side view with a partial cross section, FIG. 5 is a side view with a partial cross section for explaining one embodiment of a cooling device for equipment used in tunnel construction in which the evaporation part of a heat pipe is in contact with equipment The figure is a perspective view of the main part. 1 ... Heat pipe, 8 ... Condensing part, 10 ... Evaporating part, 15
…… Cooler, 16 …… Water pipe, 17 …… Low temperature water tank, 22 …… Tunnel, 30 …… Shield type tunnel excavator, 32 …… Heat generating device, 35 …… Sealed enclosure.
Claims (3)
記トンネル22内に設置され、トンネル工事用の熱を発生
する機器32を収容する密閉筺体35と、前記トンネル22外
に設置され、送水管16、16で前記低温水槽17に接続され
たクーラ15と、一端に凝縮部８が且つ他端に蒸発部10が
形成され、前記一端の前記凝縮部８を前記低温水槽17内
に挿入し、前記他端の蒸発部10を前記密閉筺体35内に挿
入して設置されたヒートパイプ１とを含み、前記ヒート
パイプ１を介して前記密閉筺体35内の機器32からの熱を
前記低温水槽17に伝達し、前記クーラ15で冷却された熱
交換媒体を前記低温水槽17に循環させて前記熱を前記ト
ンネル22外に排出することを特徴とするトンネル工事に
使用する機器の冷却装置。1. A low temperature water tank 17 installed in a tunnel 22, a closed casing 35 installed in the tunnel 22 for accommodating a device 32 for generating heat for tunnel construction, and an outside the tunnel 22, A cooler 15 connected to the low temperature water tank 17 by water supply pipes 16 and 16, a condenser 8 at one end and an evaporator 10 at the other end are formed, and the condenser 8 at the one end is inserted into the low temperature water tank 17. And the heat pipe 1 installed by inserting the evaporating portion 10 at the other end into the closed casing 35, and the heat from the device 32 in the closed casing 35 is passed through the heat pipe 1 to the low temperature. A cooling device for equipment used in tunnel construction, characterized in that the heat exchange medium transferred to a water tank (17) and cooled by the cooler (15) is circulated in the low temperature water tank (17) to discharge the heat to the outside of the tunnel (22).
た前記密閉筺体35を、シールド式トンネル掘削機30内に
設置したことを特徴とする請求項１に記載のトンネル工
事に使用する機器の冷却装置。2. A device for use in tunnel construction according to claim 1, wherein the closed casing 35 in which the evaporation portion 10 of the heat pipe 1 is inserted is installed in a shield tunnel excavator 30. Cooling system.
記トンネル22外に設置され、送水管16、16で前記低温水
槽17に接続されたクーラ15と、一端に凝縮部８が且つ他
端に蒸発部10が形成され、前記一端の前記凝縮部８を前
記低温水槽17内に挿入し、前記他端の蒸発部10を前記ト
ンネル22内のシールド式トンネル掘削機30内の熱を発生
する機器32に直接接触させたヒートパイプ１とを含み、
前記ヒートパイプ１を介して前記機器32からの熱を前記
低温水槽17に伝達し、前記クーラ15で冷却された熱交換
媒体を前記低温水槽17に循環させて前記熱を前記トンネ
ル22外に排出することを特徴とするトンネル工事に使用
する機器の冷却装置。3. A low temperature water tank 17 installed in the tunnel 22, a cooler 15 installed outside the tunnel 22 and connected to the low temperature water tank 17 by water pipes 16, 16, and a condenser section 8 at one end and the other. An evaporator 10 is formed at the end, the condenser 8 at the one end is inserted into the low temperature water tank 17, and the evaporator 10 at the other end generates heat in the shield tunnel excavator 30 in the tunnel 22. The heat pipe 1 in direct contact with the device 32
The heat from the device 32 is transferred to the low temperature water tank 17 via the heat pipe 1, the heat exchange medium cooled by the cooler 15 is circulated to the low temperature water tank 17, and the heat is discharged to the outside of the tunnel 22. A cooling device for equipment used in tunnel construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990071269U JP2520958Y2 (en) | 1990-07-04 | 1990-07-04 | Cooling device for equipment used for tunnel construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990071269U JP2520958Y2 (en) | 1990-07-04 | 1990-07-04 | Cooling device for equipment used for tunnel construction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0430193U JPH0430193U (en) | 1992-03-11 |
| JP2520958Y2 true JP2520958Y2 (en) | 1996-12-18 |
Family
ID=31608148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990071269U Expired - Fee Related JP2520958Y2 (en) | 1990-07-04 | 1990-07-04 | Cooling device for equipment used for tunnel construction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2520958Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5222200B2 (en) * | 2009-03-27 | 2013-06-26 | 大成建設株式会社 | Tunnel cooling system |
| JP6876527B2 (en) * | 2017-05-30 | 2021-05-26 | 大成建設株式会社 | Tunnel temperature improvement system |
| JP6949613B2 (en) * | 2017-08-09 | 2021-10-13 | 清水建設株式会社 | Cooling system, cooling method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5142932A (en) * | 1974-10-09 | 1976-04-12 | Mitsubishi Electric Corp | DENKIKIKINO REIKYAKUHOSHIKI |
| JPS5826195A (en) * | 1981-08-10 | 1983-02-16 | 本間 良治 | Drilling machine |
-
1990
- 1990-07-04 JP JP1990071269U patent/JP2520958Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0430193U (en) | 1992-03-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |