JP3673096B2 - Connection structure of sheath pipe to underground box - Google Patents

Connection structure of sheath pipe to underground box Download PDF

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Publication number
JP3673096B2
JP3673096B2 JP28776498A JP28776498A JP3673096B2 JP 3673096 B2 JP3673096 B2 JP 3673096B2 JP 28776498 A JP28776498 A JP 28776498A JP 28776498 A JP28776498 A JP 28776498A JP 3673096 B2 JP3673096 B2 JP 3673096B2
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Japan
Prior art keywords
sheath tube
underground
sheath
box
plate
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JP28776498A
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JP2000120927A (en
Inventor
祐介 北村
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Mirai Kogyo KK
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Mirai Kogyo KK
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L3/00Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/16Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supports For Pipes And Cables (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)

Description

【0001】
【発明の属する技術分野】
この発明は、離間配置された地中埋設箱同士を地中で連結する外筒内に挿通される鞘管を、同地中埋設箱に接続する地中埋設箱への鞘管の接続構造に関するものである。
【0002】
【従来の技術】
従来、地中に光ファイバーケーブル等の配線を布設するときは、まず、マンホールやハンドホール等の地中埋設箱を地中に複数個離間配設し、隣り合う地中埋設箱間を外筒により連結する。次に、外筒内に配線の外面を保護するポリエチレン製の鞘管を複数本挿通して、その両端部を地中埋設箱内にそれぞれ臨ませるとともに、鞘管の両端部を地中埋設箱の側壁に支持されて外筒開口を塞ぐプレートにそれぞれ固定する。続いて、地中埋設箱内の対向するプレートから突出した鞘管の端部同士を連結管を介して連結する。同様の作業を繰り返し、全ての鞘管を連結管により連結する。
【0003】
配線を鞘管内に挿通させるときは、まず、引き込みロープの先端にパラシュート体を連結し、そのパラシュート体を地中埋設箱内へ突出した鞘管の一端側から鞘管内に投入する。そして、エアーを鞘管の一端側からその内部に送り込み、エアーを受けたパラシュート体の鞘管の他端側方向への移動により、引き込みロープを鞘管内を通過させ、鞘管の他端側へ送り出す。次いで、鞘管の他端側に送り出された引き込みロープに配線を連結し、鞘管の一端側から引き込みロープを引き戻すことにより、配線が鞘管内に布設される。
【0004】
【発明が解決しようとする課題】
ところが、ポリエチレン製の鞘管は所定以上の温度差が生じると、伸縮する性質を有している。そのため、前記鞘管の設置作業を夏に行った場合には、冬になると、その鞘管は夏に比べて収縮する。従って、このような場合、冬に配線の布設作業を行おうとしても、鞘管の両端は地中埋設箱の側壁に支持されたプレートに固定されているため、鞘管はその縮みに耐えきれず破断したり、鞘管の端部が外筒内に入り込んだりして、配線の布設作業が非常に困難になるという問題があった。
【0005】
一方、前記鞘管の設置作業を冬に行った場合には、夏になると、鞘管は冬に比べて伸長する。従って、このような場合には、夏に配線の布設作業を行おうとしても、鞘管の伸長した分が外筒内で蛇行した状態となり、鞘管内におけるパラシュート体の送り込み作業の障害となって、配線の布設作業が非常に困難になるという問題があった。
【0006】
この発明は、このような従来技術に存在する問題に着目してなされたものである。その目的とするところは、鞘管の伸縮による不具合を無くして地中埋設箱間の配線の布設作業を容易に行えるようにすることにある。
【0007】
【課題を解決するための手段】
上記の目的を達成するために、請求項1に記載の発明は、地中埋設箱の側壁には貫通孔が形成され、離間配置された前記地中埋設箱同士を地中で連結する外筒内に挿通される鞘管であって、その管内に配線又は配管等が布設される鞘管を前記地中埋設箱に接続する構造において、前記外筒内に挿通された鞘管の両端部を、前記地中埋設箱の側壁に設けられた支持部に挿通支持させて同地中埋設箱内にそれぞれ臨ませ、前記鞘管の少なくとも一端部を前記支持部に対して、鞘管の伸縮に伴う摺動を可能とするように接続してなり、前記支持部は、前記側壁の貫通孔を覆うとともに前記鞘管を挿通支持可能な複数の支持孔が形成されたシール板と、そのシール板全体を押圧して該シール板を前記側壁の内壁に密接させる固定板とを備えたものである。
【0008】
請求項2に記載の発明は、請求項1に記載の発明において、前記鞘管の両端部には、鞘管の支持部からの抜けを規制する規制手段が備えられているものである。
【0009】
請求項3に記載の発明は、請求項1又は請求項2に記載の発明において、前記鞘管の一端部は鞘管の伸縮に伴う摺動を可能とするように前記支持部から地中埋設箱内へ突出するように余長部を有して接続され、他端部は支持部に移動不能に固定して接続されるものである。
【0010】
請求項4に記載の発明は、請求項1〜3のうちいずれか一項に記載の発明において、同じ地中埋設箱内に接続された鞘管の端部同士は連結管を介して連結されるものである。
【0011】
請求項5に記載の発明は、請求項1〜4のうちいずれか一項に記載の発明において、前記支持部は固定板、シール板及び押さえ板を組み付けて構成されるとともに、鞘管を挿通支持可能な支持孔がそれぞれ形成されているものである。
【0013】
【発明の実施の形態】
以下、この発明の実施形態について詳細に説明する。
図1に示すように、マンホール、ハンドホール等の地中埋設箱13はコンクリートにより四角箱状に形成され、その上面には開口部14が形成されている。また、図2及び図3に示すように、地中埋設箱13の一対の側壁の対向する位置にはそれぞれ円形状の貫通孔15が側壁を貫通して形成されている。地中埋設箱13の内壁において、前記貫通孔15の外縁の近傍には所定間隔をおいて第1固定孔16が8箇所に形成されている。そして、地盤を所定又は任意の間隔をおいて掘り下げ、そこに地中埋設箱13が埋設される。
【0014】
合成樹脂製のスリーブ17は、ほぼ筒状をなす筒部17aと、その筒部17aの一端開口縁に、筒部17aに対して直交するように外方へ延びる鍔部17bとより形成されている。筒部17aの外径は前記地中埋設箱13の貫通孔15の内径と対応し、筒部17aの長さは地中埋設箱13の側壁の厚みと対応するようになっている。そして、図4に示すように、地中埋設箱13の内壁側から貫通孔15にスリーブ17の筒部17aが嵌入され、鍔部17bが内壁に係合して地中埋設箱13に対して抜け止めされるようになっている。
【0015】
外筒18はコンクリート又は塩化ビニールにより筒状に形成され、その内径は前記スリーブ17の筒部17aの外径と対応するようになっている。そして、地中埋設箱13の貫通孔15に嵌入されたスリーブ17の筒部17aを外筒18内に嵌入することにより、外筒18をスリーブ17を介して地中埋設箱13に接続することができるようになっている。また、外筒18内には複数本の鞘管11を挿入することができるようになっている。
【0016】
合成樹脂製の鞘管11は筒状に形成され、内径が異なる複数種類を有している。そして、図1に示すように、その内部に光ファイバー等の配線12、給水管の配管等を挿通して保護するようになっている。また、合成樹脂の中でも、例えばポリエチレン製の鞘管11は250mあたり、プラスマイナス10℃の温度差が生じると約30cm伸縮する性質を有している。
【0017】
図2及び図3に示すように、ステンレス鋼製の支持板としての押さえ板19は円盤状に形成され、その縁部には押さえ板19の周方向へ所定間隔をおいて第1ボルト孔20が6箇所に形成されている。また、押さえ板19には内径の異なる第1支持孔21が7箇所に形成され、その内径は前記鞘管11の外径と対応するようになっている。
【0018】
図2に示すように、支持板としての固定側用固定板22はステンレス鋼によりほぼ四角板状に形成され、その中央には内径の異なる第2支持孔23が7箇所に形成されている。また、第2支持孔23の内径は前記鞘管11の外径と対応するようになっている。第2支持孔23よりやや外方位置には、所定高さのナット部24が所定間隔をおいて6箇所に形成され、そのナット部24の内周面には図示されない雌ねじが形成されている。また、固定側用固定板22の縁部には所定間隔をおいて第2固定孔25が8箇所に形成されている。
【0019】
支持板としての固定側用シール板26は発泡ゴム等の軟質材料によりほぼ四角板状に形成され、その中央には内径の異なる第3支持孔27が7箇所に形成されている。この第3支持孔27の内径は、各第3支持孔27に対応する鞘管11の外径よりやや小さめに形成されている。そのため、鞘管11を第3支持孔27に挿通したとき、第3支持孔27の内周縁が鞘管11の外周面に密接して、鞘管11の外周面と第3支持孔27との間の隙間をシールするようになっている。また、固定側用シール板26の縁部には所定間隔をおいて第3固定孔28が8箇所に形成されている。
【0020】
図3に示すように、支持板としての摺動側用固定板29はステンレス鋼によりほぼ四角板状に形成され、その中央には内径の異なる第4支持孔30が7箇所に形成されている。また、第4支持孔30の内径は前記鞘管11の外径と対応するようになっている。第4支持孔30よりやや外方位置には、図示されない孔に挿通されたボルトの頭部を摺動側用固定板29に溶接したボルト部31が所定間隔をおいて6箇所に形成されている。摺動側用固定板29の縁部には所定間隔をおいて第4固定孔32が8箇所に形成されている。
【0021】
支持板としての摺動側用シール板33は発泡ゴム等の軟質材料によりほぼ四角板状に形成され、その中央には内径の異なる第5支持孔34が形成されている。この第5支持孔34の内径は、各第5支持孔34に対応する鞘管11の外径よりやや小さめに形成されている。そのため、鞘管11を第5支持孔34に挿通したとき、第5支持孔34の内周縁が鞘管11の外周面に密接して、鞘管11の外周面と第5支持孔34との間の隙間をシールするようになっている。また、第5支持孔34よりやや外方位置には第2ボルト孔35が、摺動側用シール板33の周方向へ所定間隔をおいて6箇所に形成されている。摺動側用シール板33の縁部には所定間隔をおいて第5固定孔39が8箇所に形成されている。
【0022】
次に、地中埋設箱13への鞘管11の接続方法について説明する。
まず、図4に示すように、地中埋設箱13は離間配置され、外筒18により地中で連結される。図2に示すように、鞘管11の一端部を地中埋設箱13に接続するときは、まず、固定側用シール板26の第3支持孔27の内径に対応するように2点鎖線で示す鞘管11を挿通させる。このとき、第3支持孔27の内周縁は鞘管11の挿通に伴い鞘管11の外周面に密接して第3支持孔27の内周縁と鞘管11の外周面との間の隙間をシールする。次に、固定側用固定板22の第2支持孔23を固定側用シール板26の第3支持孔27に対応させるとともに、鞘管11を固定側用固定板22において対応する第2支持孔23に挿通させる。
【0023】
続いて、鞘管11の固定側用固定板22より突出した部分において、ステンレス鋼により円環状に形成された鞘管バンド36を、その鞘管11の端部よりやや内方位置に嵌合するとともに、この鞘管バンド36が鞘管11から抜け出ないように鞘管11に押圧固定する。その結果、鞘管バンド36により鞘管11は第2支持孔23及び第3支持孔27から抜け出るのが規制される。このとき、鞘管バンド36の厚みは固定側用固定板22のナット部24の高さと同じになっている。
【0024】
次いで、固定側用固定板22の第2支持孔23と押さえ板19の第1支持孔21とを対応させるとともに、鞘管11を押さえ板19において対応する第1支持孔21に挿通させる。このとき、押さえ板19の第1ボルト孔20と固定側用固定板22のナット部24とは対応し、各第1ボルト孔20から対応するナット部24にそれぞれボルト37を螺合し、押さえ板19と固定側用固定板22とを固定する。また、このとき、固定側用固定板22の第2固定孔25と固定側用シール板26の第3固定孔28とは対応するようになっている。そのため、第2固定孔25から対応する第3固定孔28にそれぞれボルト37を挿通し、さらにボルト37を地中埋設箱13の第1固定孔16に螺合すると、押さえ板19が固定された固定側用固定板22は固定側用シール板26を介して地中埋設箱13に固定される。
【0025】
その結果、図5に示すように、固定側支持部38が構成されるとともに、固定側用固定板22と押さえ板19との間に挟み込まれた鞘管バンド36により鞘管11の一端部が固定側支持部38に対して移動不能に接続される。このとき、鞘管11は押さえ板19から地中埋設箱13内へやや突出した状態になっている。
【0026】
次に、鞘管11の他端部を地中埋設箱13に接続するときは、図3に示すように、まず、押さえ板19の第1支持孔21、摺動側用シール板33の第5支持孔34及び摺動側用固定板29の第4支持孔30の内径がそれぞれ対応するようにする。そして、摺動側用固定板29のボルト部31を摺動側用シール板33の第2ボルト孔35及び押さえ板19の第1ボルト孔20に対応させるとともに、それらにボルト部31を挿通する。次いで、押さえ板19側に突出したボルト部31にワッシャー40aを介してナット40bを螺合して押さえ板19、摺動側用シール板33及び摺動側用固定板29を固定する。
【0027】
続いて、押さえ板19の第1支持孔21、摺動側用シール板33の第5支持孔34及び摺動側用固定板29の第4支持孔30の内径に対応するように2点鎖線で示す鞘管11を、押さえ板19側から摺動側用固定板29方向へ挿通させる。このとき、第5支持孔34の内周縁は鞘管11の挿通に伴い鞘管11の外周面に密接して第5支持孔34の内周縁と鞘管11の外周面との間の隙間をシールする。また、各支持孔21,30,34に挿通された鞘管11は、摺動側用固定板29から所定長さ突出して余長部41を有するように挿通される。
【0028】
摺動側用固定板29より突出した余長部41に、ステンレス鋼により円環状に形成された鞘管バンド36を、鞘管11の端部よりやや内方位置に嵌合するとともに、この鞘管バンド36が鞘管11から抜け出ないように鞘管11に押圧固定する。
【0029】
最後に、ボルト部31とナット40bとの螺合により固定された摺動側用シール板33の第5固定孔39及び摺動側用固定板29の第4固定孔32を地中埋設箱13の第1固定孔16に対応させるとともに、それらにボルト37を挿通し、ボルト37を第1固定孔16に螺合する。その結果、図5に示すように、摺動側支持部42が構成されるとともに、鞘管11が摺動側用固定板29から所定長さ突出して余長部41を有するように接続される。
【0030】
従って、図5に示すように、鞘管11の一端が余長部41をほとんど有しない状態で固定側支持部38に接続され、他端部が地中埋設箱13内方向に余長部41を有するように摺動側支持部42に接続される。
【0031】
図1に示すように、地中埋設箱13内の対向する位置に接続された鞘管11の端部同士を連結管43により連結する。この連結管43は合成樹脂により筒状に形成されるとともに、ねじをねじ込み可能な図示されない雌ねじ部を両開口44a、44bの外周に備えている。そして、その雌ねじ部にねじをねじ込むことにより連結管43の両開口44a、44bの内径を縮径できるようになっている。
【0032】
まず、連結管43のねじ止めを解除し、その両開口44a、44bを拡径状態にして両開口44a、44b内に鞘管11の端部をそれぞれ挿入する。そして、ねじを雌ねじ部にねじ込み連結管43の両開口44a、44bを縮径させる。その結果、連結管43の両開口44a、44bの縮径に伴い、鞘管11の端部を連結管43により押圧固定して鞘管11の端部同士が連結管43を介して連結される。
【0033】
連結管43を介して連結された鞘管11内に配線12を挿通させるときは、まず、引き込みロープの先端にパラシュート体を連結し、そのパラシュート体を鞘管11の一端側から鞘管11内に投入する。そして、エアーを鞘管11の一端側からその内部に送り込み、エアーを受けたパラシュート体の鞘管11の他端側方向への移動により、引き込みロープを鞘管11内を通過させ、鞘管11の他端側へ送り出す。次いで、鞘管11の他端側に送り出された引き込みロープに配線12を連結し、鞘管11の一端側から引き込みロープを引き戻すことにより、図1に示すように、配線12が鞘管11内に布設される。配線12が鞘管11内に布設された後、連結管43のねじを雌ねじ部から抜き取り、連結管43の両開口44a、44bを拡径状態にして、鞘管11の端部から連結管43を取り去る。
【0034】
ここで、鞘管11を布設した時期より10℃以上のマイナス温度差が生じたとき、鞘管11は収縮しようとする。ところが、鞘管11の一端部は、地中埋設箱13の固定側支持部38に余長部41を有しない状態で移動不能に固定して接続され、他端部は鞘管11の伸縮に伴う摺動を可能とするように余長部41を有した状態で摺動側支持部42に接続されている。そのため、余長部41の長さ分だけ鞘管11の他端部が外筒18内に入り込むのが許容される。その結果、鞘管11が破断したり、鞘管11の他端部が外筒18の内奥部に入り込んでしまったりする不具合を防止することができる。
【0035】
一方、鞘管11を布設した時期より10℃以上のプラス温度差が生じたとき、鞘管11は伸長しようとする。ところが、鞘管11の他端部は、鞘管11の伸長に伴う摺動を可能とするように摺動側支持部42に接続されているため、鞘管11が伸びた分だけ地中埋設箱13内へ移動する。その結果、鞘管11の両端部が地中埋設箱13に移動不能に固定されているときのように鞘管11が外筒18内で蛇行する不具合を防止することができる。
【0036】
従って、鞘管11を布設した時期より10℃以上のマイナス又はプラスの温度差が生じたときも、パラシュート体を鞘管11内に送り込む作業を容易に行うことができ、配線12の増設作業を支障をきたすことなく容易に行うことができる。また、摺動側用シール板33は摺動側用固定板29と押さえ板19との間に固定されている。そのため、鞘管11の伸縮が生じた場合、その伸縮に伴う摺動側用シール板33の移動を防止することができる。
【0037】
以上のように、この実施形態の地中埋設箱13への鞘管11の接続構造によれば、次のような効果が発揮される。
(1) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、鞘管11の一端部は、余長部41を有しない状態で地中埋設箱13の固定側支持部38に移動不能に固定して接続され、他端部は鞘管11の伸縮に伴う摺動を可能とするように余長部41を有した状態で地中埋設箱13の摺動側支持部42に接続されている。そのため、鞘管11が収縮した場合も、余長部41の長さ分だけ鞘管11が外筒18内に入り込むのを許容することができる。その結果、鞘管11の収縮により破断したり、鞘管11の端部が外筒18の内奥部に入り込んでしまったりする不具合を防止することができる。一方、鞘管11が伸長した場合も、鞘管11の他端部が伸びた分だけ地中埋設箱13内へ移動する。その結果、鞘管11の両端部が地中埋設箱13に移動不能に固定されているときのように鞘管11が外筒18内で蛇行する不具合を防止することができる。従って、鞘管11内にパラシュート体の送り込み作業を支障をきたすことなく行うことができ、配線12の布設作業を容易に行うことができる。
【0038】
(2) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、地中埋設箱13の両支持部38,42に接続された鞘管11の端部には各支持孔21,23,27,30,34の内径より外径の大きい鞘管バンド36が取り付けられている。そのため、鞘管11が伸縮したとき、鞘管11が各支持孔21,23,27,30,34から抜け出るのを防止することができる。
【0039】
(3) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、鞘管11の一端部は地中埋設箱13に対して移動不能に固定して接続されている。そのため、鞘管11の他端部の余長部41の長さを容易に計測することができ、余長部41の長さの設定をほぼ正確に行うことができる。
【0040】
(4) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、地中埋設箱13の対向する位置に設けられた両支持部38,42に接続された鞘管11の相対向する端部間に連結管43を接続することができる。従って、複数本の鞘管11を連結管43を介して連結することができ、配線12を連結された複数本の鞘管11内を一度に挿通させることができる。
【0041】
(5) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、鞘管11の一端部側の固定側支持部38は、地中埋設箱13の内壁に固定側用シール板26、固定側用固定板22及び押さえ板19を前記の順で取り付けて構成されている。そして、固定側用固定板22と押さえ板19との間には鞘管11の端部に押圧固定された鞘管バンド36が挟み込まれている。そのため、押さえ板19及び固定側用固定板22により鞘管バンド36が移動するのを防止して、鞘管11が移動するのを防止することができる。
【0042】
(6) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、鞘管11の他端部側の摺動側支持部42は、地中埋設箱13の内壁に押さえ板19、摺動側用シール板33及び摺動側用固定板29を前記の順で取り付けて構成されている。そのため、鞘管11の伸縮に伴う摺動側用シール板33の移動を押さえ板19と摺動側固定板29との挟持構成により防止することができる。
【0043】
(7) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、固定側用シール板26の第3支持孔27及び摺動側用シール板33の第5支持孔34の内径は、その内径に対応する鞘管11の外径よりやや小さめに形成されている。そのため、第3支持孔27又は第5支持孔34の内周縁がそれらに挿通された鞘管11の外周面に密接する。従って、第3支持孔27又は第5支持孔34の内周縁とそれらに挿通された鞘管11の外周面との間の隙間をシールして地中埋設箱13内から外筒18内に埃や水等が侵入するのを防止することができる。
【0044】
(8) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、固定側用シール板26及び摺動側用シール板33の一面が地中埋設箱13の内壁に密接するように取り付けられ、内壁と固定側用シール板26及び摺動側用シール板33との間をシールしている。そのため、地中埋設箱13の貫通孔15から外筒18内に埃や水が侵入するのを防止することができる。
【0045】
(9) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、摺動側用固定板29には、ボルト部31が所定間隔をおいて6箇所に形成されている。そのため、そのボルト部31を摺動側用シール板33の第2ボルト孔35及び押さえ板19の第1ボルト孔20に挿通し、押さえ板19側に突出したボルト部31にワッシャー40aを介してナット40bを螺合することにより押さえ板19、摺動側用シール板33及び摺動側用固定板29を固定することができる。従って、例えば、同一軸線上にそれぞれボルト孔が形成された摺動側用固定板、摺動側用シール板及び押さえ板の各ボルト孔に別体のボルトを挿通する場合と比較して、その作業の簡易化を図ることができるとともに、作業時間の短縮を図ることができる。
【0046】
(10) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、固定側用固定板22にはナット部24が所定間隔をおいて6箇所に形成され、そのナット部24の内周面には雌ねじが形成されている。そのため、押さえ板19に形成された第1ボルト孔20からナット部24にボルト37を挿通し、螺合することにより固定側用固定板22に押さえ板19を固定することができる。従って、例えば、同一軸線上にそれぞれボルト孔が形成された押さえ板及び固定側用固定板の各ボルト孔にボルトを挿通し、別体のナットにボルトを螺合する場合と比較して、その作業の簡易化を図ることができるとともに、作業時間の短縮を図ることができる。
【0047】
(11) この実施形態の地中埋設箱13への鞘管11の接続構造によれば、固定側用固定板22に形成されたナット部24の高さは鞘管バンド36の厚みと同じになっている。そのため、鞘管バンド36を押さえ板19と固定側用固定板22との間に挟み込んだとき、押さえ板19が鞘管バンド36に当接して不安定な状態になるのを防止することができる。その結果、固定側用固定板22に押さえ板19を確実に固定することができる。
【0048】
尚、前記実施形態を次のように変更して具体化することも可能である。
・ 例えば、鞘管11の設置作業時期が冬期のように低温時期である場合には、地中埋設箱13の内壁に押さえ板19、摺動側用シール33板及び摺動側用固定板29の順で取り付けられた摺動側支持部42に、鞘管11の一端部を余長部41を有しない状態で接続し、地中埋設箱13の内壁に押さえ板19、摺動側用シール板33及び摺動側用固定板29の順で取り付けられた摺動側支持部42に、鞘管11の他端部も余長部41を有しない状態で接続してもよい。このように構成した場合、夏に前記作業時期よりも所定以上のプラス温度差が生じると、鞘管11は伸長する。しかし、鞘管11の両端部は伸長に伴う鞘管11の摺動を許容するように摺動側支持部42に非固定状態で挿通されているため、鞘管11が伸びた分だけ地中埋設箱13内へ突出するように移動する。その結果、鞘管11の両端部が地中埋設箱13に移動不能に固定されているときのように鞘管11が外筒18内で蛇行するのを防止することができる。
【0049】
・ 地中埋設箱13の内壁に押さえ板19、摺動側用シール板33及び摺動側用固定板29の順で取り付けられた摺動側支持部42に、鞘管11の一端部を余長部41を有した状態で接続し、地中埋設箱13の内壁に押さえ板19、摺動側用シール板33及び摺動側用固定板29の順で取り付けられた摺動側支持部42に、鞘管11の他端部を余長部41を有しない状態で接続してもよい。このように構成した場合も、鞘管11の伸縮による不具合を防止することができる。
【0052】
・ 鞘管バンド36の代わりに、ゴム等の軟質材料により形成されたO−リングを使用してもよい。このように構成した場合、鞘管11の端部にO−リングを嵌合するとき、O−リングは拡径変形するとともに、縮径して鞘管11の外周面を押圧固定する。そのため、鞘管11の端部からO−リングが抜け出るのを防止することができる。
【0053】
・ 地中埋設箱13の側壁に直接支持孔を形成し、その支持孔に鞘管11の少なくとも一端を、その伸縮に伴う摺動を可能とするように接続してもよい。また、このとき、前記支持孔に対応する支持孔が形成されたシール板を、地中埋設箱13の側壁に取り付けてもよい。このように構成した場合も、実施形態と同様の効果を発揮させることができる。
【0054】
・ 鞘管11内に給水管等の配管を挿通する場合に、前記鞘管11の接続構造を採用してもよい。
さらに、前記実施形態より把握される技術的思想について以下に記載する。
【0055】
・ 前記規制手段は支持部に形成された支持孔の内径よりも外径が大きく形成されるとともに、鞘管に嵌合可能な環状体である請求項2に記載の地中埋設箱への鞘管の接続構造。このように構成した場合、鞘管の端部に環状体を嵌合することにより、鞘管の端部の外径を支持孔の内径より大きくすることができる。そのため、鞘管が支持孔から外筒内方向へ抜け出るのを防止することができる。
【0056】
・ 前記シール板に形成された支持孔の内径は、支持孔に挿通される鞘管の外径よりやや小さめに形成される請求項に記載の地中埋設箱への鞘管の接続構造。このように構成した場合、シール板の支持孔の内周縁が、その支持孔に挿通された鞘管の外周面に密接して支持孔の内周縁と鞘管の外周面との間の隙間をシールする。そのため、外筒内に埃や水が侵入するのを防止することができる。
【0057】
・ 前記規制手段を支持部に形成された支持孔の内径よりも外径が大きくなるように形成するとともに、鞘管に嵌合可能な環状体により構成し、同環状体は鞘管の端部よりやや内方位置に嵌合される請求項2に記載の地中埋設箱への鞘管の接続構造。このように構成した場合、環状体は鞘管の端部よりやや内方位置に嵌合される。そのため、連結管の両端部を鞘管の端部に嵌合させることができ、連結管を介して鞘管を連結することができる。
【0058】
・ 前記鞘管の端部を余長部を有する状態で支持部に接続するとき、支持部は地中埋設箱の内壁側から押さえ板、シール板及び固定板の順で取り付けられて構成される請求項に記載の地中埋設箱への鞘管の接続構造。このように構成した場合、鞘管の伸縮に伴う摺動によるシール板の移動を押さえ板及び固定板により防止することができる。
【0059】
・ 前記鞘管の端部を支持部に移動不能に固定して接続するとき、支持部は地中埋設箱の内壁側からシール板、固定板及び押さえ板の順で取り付けられて構成され、シール板と押さえ板との間には鞘管の端部に設けられた規制手段が挟み込まれる請求項に記載の地中埋設箱への鞘管の接続構造。このように構成した場合、鞘管の端部に設けられた規制手段は押さえ板と固定板の間に挟み込まれ、移動不能になっている。そのため、鞘管の伸縮に伴う摺動を防止することができるとともに、鞘管が外筒内へ入り込むのを防止することができる。
【0060】
【発明の効果】
請求項1に記載の発明によれば、鞘管の伸縮による不具合を無くして地中埋設箱間の配線の布設作業を容易に行うことができる。また、地中埋設箱の貫通孔から外筒内に埃や水が侵入するのを防止することができるとともに、シール板により支持孔の内周縁と鞘管の外周面との間の隙間をシールして外筒内に埃や水が侵入するのを防止することができる。さらに、地中埋設箱に支持孔を加工する場合と比較して作業の簡易化を図ることができるとともに、作業時間の短縮を図ることができる。
【0061】
請求項2に記載の発明によれば、請求項1に記載の発明の効果に加え、鞘管が外筒内へ入り込むのを防止することができる。
請求項3に記載の発明によれば、請求項1又は請求項2に記載の発明の効果に加え、鞘管の他端部の余長部の長さを容易に計測することができ、余長部の長さの設定をほぼ正確に行うことができる。
【0062】
請求項4に記載の発明によれば、請求項1〜3のうちいずれか一項に記載の発明の効果に加え、対向するように位置する鞘管の端部を連結することができ、配線の布設作業を容易に行うことができる。
【0063】
請求項5に記載の発明によれば、請求項1〜4のうちいずれか一項に記載の発明の効果に加え、押さえ板と固定板又は固定板によりシール板を地中埋設箱に移動不能に固定することができる。
【図面の簡単な説明】
【図1】実施形態の地中埋設箱への鞘管の接続構造を示す断面図。
【図2】固定側支持部を示す分解斜視図。
【図3】摺動側支持部を示す分解斜視図。
【図4】地中埋設箱間に外筒を接続した状態を示す断面図。
【図5】外筒内の鞘管の両端部を接続した状態を示す断面図。
【符号の説明】
11…鞘管、12…配線、13…地中埋設箱、18…外筒、19…支持板としての押さえ板、21…支持孔としての第1支持孔、22…支持板としての固定側用固定板、23…支持孔としての第2支持孔、26…支持板としての固定側用シール板、27…支持孔としての第3支持孔、29…支持板としての摺動側用固定板、30…支持孔としての第4支持孔、33…支持板としての摺動側用シール板、34…支持孔としての第5支持孔、36…規制手段としての鞘管バンド、38…支持部としての固定側支持部、41…余長部、42…支持部としての摺動側支持部、43…連結管。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure of a sheath tube to a buried underground box that connects a sheath tube inserted into an outer cylinder that connects the buried underground boxes spaced apart to each other into the underground buried box. Is.
[0002]
[Prior art]
Conventionally, when laying wiring such as optical fiber cables in the ground, first, a plurality of underground burial boxes such as manholes and handholes are spaced apart in the ground, and between adjacent underground burial boxes using an outer cylinder Link. Next, a plurality of polyethylene sheath pipes that protect the outer surface of the wiring are inserted into the outer cylinder, and both ends thereof are respectively exposed in the underground box, and both ends of the sheath pipe are exposed to the underground box. Each of the plates is fixed to a plate that is supported by the side wall and closes the opening of the outer cylinder. Subsequently, the ends of the sheath pipes protruding from the opposing plates in the underground box are connected via a connecting pipe. The same operation is repeated, and all the sheath tubes are connected by the connecting tubes.
[0003]
When inserting the wiring into the sheath tube, first, a parachute body is connected to the tip of the pull-in rope, and the parachute body is thrown into the sheath tube from one end side of the sheath tube protruding into the underground box. And air is sent into the inside from one end side of the sheath tube, and by moving the parachute body receiving air in the direction of the other end side of the sheath tube, the pull-in rope passes through the inside of the sheath tube and moves to the other end side of the sheath tube. Send it out. Next, the wiring is connected to the drawing rope sent to the other end side of the sheath tube, and the wiring is laid in the sheath tube by pulling the drawing rope back from one end side of the sheath tube.
[0004]
[Problems to be solved by the invention]
However, a polyethylene sheath tube has a property of expanding and contracting when a temperature difference of a predetermined value or more occurs. Therefore, when the installation operation of the sheath tube is performed in summer, the sheath tube contracts compared to summer in winter. Therefore, in such a case, even if the wiring is laid in winter, both ends of the sheath tube are fixed to the plates supported by the side walls of the underground box, so that the sheath tube can withstand the shrinkage. There was a problem that the wiring laying operation became very difficult because the tube was broken or the end of the sheath tube entered the outer cylinder.
[0005]
On the other hand, when the installation of the sheath tube is performed in winter, the sheath tube extends in the summer compared to winter. Therefore, in such a case, even if an attempt is made to lay the wiring in the summer, the extended portion of the sheath tube is meandering in the outer cylinder, which hinders the operation of feeding the parachute body in the sheath tube. There is a problem that the wiring laying work becomes very difficult.
[0006]
The present invention has been made paying attention to such problems existing in the prior art. The purpose is to eliminate the trouble caused by expansion and contraction of the sheath tube so that the wiring work between the underground boxes can be easily performed.
[0007]
[Means for Solving the Problems]
  In order to achieve the above object, the invention described in claim 1A through hole is formed in the side wall of the underground box,SpacedSaidA sheath tube inserted into an outer cylinder that connects underground burial boxes together,sheathIn a structure in which a sheath pipe in which wiring or piping is laid in the pipe is connected to the underground box, both ends of the sheath pipe inserted into the outer cylinder are provided on the side walls of the underground box. The support part is inserted and supported so as to face each other in the underground box, and at least one end part of the sheath tube is connected to the support part so as to be able to slide with expansion and contraction of the sheath pipe.The support part covers the through hole of the side wall and has a seal plate formed with a plurality of support holes capable of inserting and supporting the sheath tube, and presses the entire seal plate to place the seal plate on the side wall With a fixed plate to be in close contact with the inner wall of theIs.
[0008]
The invention according to claim 2 is the invention according to claim 1, wherein both end portions of the sheath tube are provided with restricting means for restricting removal of the sheath tube from the support portion.
[0009]
According to a third aspect of the present invention, in the first or second aspect of the present invention, one end portion of the sheath tube is buried from the support portion into the ground so as to be able to slide along with expansion and contraction of the sheath tube. An extra length portion is connected so as to protrude into the box, and the other end portion is fixedly connected to the support portion so as not to move.
[0010]
Invention of Claim 4 is invention in any one of Claims 1-3. WHEREIN: The edge parts of the sheath pipe connected in the same underground burial box are connected through the connection pipe. Is.
[0011]
  The invention according to claim 5 is the invention according to any one of claims 1 to 4,The support portion is configured by assembling a fixed plate, a seal plate, and a pressing plate, and has support holes that can be inserted and supported through the sheath tube.It is.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
As shown in FIG. 1, underground boxes 13 such as manholes and handholes are formed of concrete in a square box shape, and an opening 14 is formed on the upper surface thereof. As shown in FIGS. 2 and 3, circular through holes 15 are formed through the side walls at positions where the pair of side walls of the underground box 13 are opposed to each other. On the inner wall of the underground box 13, eight first fixing holes 16 are formed in the vicinity of the outer edge of the through hole 15 at predetermined intervals. Then, the ground is dug at a predetermined or arbitrary interval, and the underground burying box 13 is embedded therein.
[0014]
The sleeve 17 made of synthetic resin is formed by a cylindrical portion 17a having a substantially cylindrical shape, and a flange portion 17b extending outwardly so as to be orthogonal to the cylindrical portion 17a at one end opening edge of the cylindrical portion 17a. Yes. The outer diameter of the cylindrical portion 17 a corresponds to the inner diameter of the through hole 15 of the underground box 13, and the length of the cylindrical portion 17 a corresponds to the thickness of the side wall of the underground box 13. And as shown in FIG. 4, the cylinder part 17a of the sleeve 17 is inserted by the through-hole 15 from the inner wall side of the underground burying box 13, and the collar part 17b engages with an inner wall, and with respect to the underground burying box 13 It is designed to prevent it from coming off.
[0015]
The outer cylinder 18 is formed in a cylindrical shape from concrete or vinyl chloride, and the inner diameter thereof corresponds to the outer diameter of the cylindrical portion 17a of the sleeve 17. Then, the outer cylinder 18 is connected to the underground box 13 via the sleeve 17 by inserting the cylindrical portion 17 a of the sleeve 17 inserted into the through hole 15 of the underground box 13 into the outer cylinder 18. Can be done. A plurality of sheath tubes 11 can be inserted into the outer cylinder 18.
[0016]
The synthetic resin sheath tube 11 is formed in a cylindrical shape and has a plurality of types having different inner diameters. And as shown in FIG. 1, the wiring 12, such as an optical fiber, the piping of a water supply pipe, etc. are inserted in the inside and protected. Among the synthetic resins, for example, the polyethylene sheath tube 11 has a property of expanding and contracting by about 30 cm when a temperature difference of ± 10 ° C. occurs per 250 m.
[0017]
As shown in FIGS. 2 and 3, the pressing plate 19 as a support plate made of stainless steel is formed in a disc shape, and the first bolt hole 20 is formed at the edge thereof at a predetermined interval in the circumferential direction of the pressing plate 19. Are formed in six places. The holding plate 19 is formed with seven first support holes 21 having different inner diameters, and the inner diameter corresponds to the outer diameter of the sheath tube 11.
[0018]
As shown in FIG. 2, the fixed-side fixing plate 22 as a support plate is formed in a substantially square plate shape from stainless steel, and second support holes 23 having different inner diameters are formed at seven locations in the center thereof. The inner diameter of the second support hole 23 corresponds to the outer diameter of the sheath tube 11. At a position slightly outward from the second support hole 23, nut portions 24 having a predetermined height are formed at six positions at predetermined intervals, and a female screw (not shown) is formed on the inner peripheral surface of the nut portion 24. . In addition, second fixing holes 25 are formed at eight positions at predetermined intervals on the edge of the fixing plate 22 for fixing side.
[0019]
The fixed-side seal plate 26 as a support plate is formed in a substantially square plate shape by a soft material such as foam rubber, and third support holes 27 having different inner diameters are formed at seven locations in the center thereof. The inner diameter of the third support hole 27 is formed slightly smaller than the outer diameter of the sheath tube 11 corresponding to each third support hole 27. Therefore, when the sheath tube 11 is inserted into the third support hole 27, the inner peripheral edge of the third support hole 27 is in close contact with the outer periphery surface of the sheath tube 11, and the outer periphery surface of the sheath tube 11 and the third support hole 27 are in contact with each other. The gap between them is sealed. In addition, third fixing holes 28 are formed at eight locations at predetermined intervals on the edge of the fixing-side seal plate 26.
[0020]
As shown in FIG. 3, the sliding-side fixing plate 29 as a support plate is formed in a substantially square plate shape from stainless steel, and fourth support holes 30 having different inner diameters are formed at seven locations in the center thereof. . The inner diameter of the fourth support hole 30 corresponds to the outer diameter of the sheath tube 11. Bolts 31 formed by welding the heads of bolts inserted through holes (not shown) to the sliding-side fixing plate 29 are formed at six positions at predetermined intervals slightly outside the fourth support hole 30. Yes. The fourth fixing holes 32 are formed at eight positions at predetermined intervals on the edge of the sliding side fixing plate 29.
[0021]
The sliding side seal plate 33 as a support plate is formed in a substantially square plate shape by a soft material such as foam rubber, and a fifth support hole 34 having a different inner diameter is formed at the center thereof. The inner diameter of the fifth support hole 34 is slightly smaller than the outer diameter of the sheath tube 11 corresponding to each fifth support hole 34. Therefore, when the sheath tube 11 is inserted into the fifth support hole 34, the inner peripheral edge of the fifth support hole 34 is in close contact with the outer peripheral surface of the sheath tube 11, and the outer peripheral surface of the sheath tube 11 and the fifth support hole 34 are The gap between them is sealed. Further, the second bolt holes 35 are formed at six positions at predetermined intervals in the circumferential direction of the sliding side seal plate 33 at positions slightly outward from the fifth support holes 34. Fifth fixing holes 39 are formed at eight locations at predetermined intervals on the edge of the sliding side seal plate 33.
[0022]
Next, a method for connecting the sheath tube 11 to the underground box 13 will be described.
First, as shown in FIG. 4, the underground burying box 13 is spaced apart and connected to the ground by an outer cylinder 18. As shown in FIG. 2, when one end of the sheath tube 11 is connected to the underground box 13, first, a two-dot chain line is used so as to correspond to the inner diameter of the third support hole 27 of the fixed-side seal plate 26. The sheath tube 11 shown is inserted. At this time, the inner peripheral edge of the third support hole 27 comes into close contact with the outer peripheral surface of the sheath tube 11 as the sheath tube 11 is inserted, and a gap between the inner peripheral edge of the third support hole 27 and the outer peripheral surface of the sheath tube 11 is formed. Seal. Next, the second support hole 23 of the fixed plate 22 for the fixed side is made to correspond to the third support hole 27 of the seal plate 26 for the fixed side, and the second support hole corresponding to the sheath tube 11 in the fixed plate 22 for the fixed side. 23 is inserted.
[0023]
Subsequently, in a portion protruding from the fixing plate 22 for the fixed side of the sheath tube 11, the sheath tube band 36 formed in an annular shape from stainless steel is fitted to a slightly inward position from the end portion of the sheath tube 11. At the same time, the sheath tube band 36 is pressed and fixed to the sheath tube 11 so as not to come out of the sheath tube 11. As a result, the sheath tube 11 is restricted from coming out of the second support hole 23 and the third support hole 27 by the sheath tube band 36. At this time, the thickness of the sheath tube band 36 is the same as the height of the nut portion 24 of the fixed plate 22 for the fixed side.
[0024]
Next, the second support hole 23 of the fixing plate 22 for the fixed side and the first support hole 21 of the pressing plate 19 are made to correspond to each other, and the sheath tube 11 is inserted into the corresponding first support hole 21 in the pressing plate 19. At this time, the first bolt hole 20 of the holding plate 19 and the nut portion 24 of the fixed plate 22 for fixing correspond to each other, and the bolt 37 is screwed into the corresponding nut portion 24 from each first bolt hole 20 to hold the holding plate. The plate 19 and the fixed side fixing plate 22 are fixed. At this time, the second fixing hole 25 of the fixing plate for fixing side 22 and the third fixing hole 28 of the sealing plate for fixing side 26 correspond to each other. Therefore, when the bolts 37 are respectively inserted from the second fixing holes 25 into the corresponding third fixing holes 28, and the bolts 37 are screwed into the first fixing holes 16 of the underground box 13, the holding plate 19 is fixed. The fixed plate 22 for the fixed side is fixed to the underground box 13 via the seal plate 26 for the fixed side.
[0025]
As a result, as shown in FIG. 5, the fixed-side support portion 38 is configured, and one end portion of the sheath tube 11 is formed by the sheath tube band 36 sandwiched between the fixed-side fixing plate 22 and the pressing plate 19. It is immovably connected to the fixed side support portion 38. At this time, the sheath tube 11 is in a state of slightly protruding from the holding plate 19 into the underground box 13.
[0026]
Next, when the other end of the sheath tube 11 is connected to the underground box 13, as shown in FIG. 3, first, the first support hole 21 of the presser plate 19 and the first seal plate 33 of the sliding side seal plate 33 are used. The inner diameters of the fifth support hole 34 and the fourth support hole 30 of the sliding-side fixing plate 29 correspond to each other. Then, the bolt portion 31 of the sliding-side fixing plate 29 is made to correspond to the second bolt hole 35 of the sliding-side seal plate 33 and the first bolt hole 20 of the holding plate 19, and the bolt portion 31 is inserted therethrough. . Next, a nut 40b is screwed into the bolt portion 31 protruding to the holding plate 19 side through a washer 40a to fix the holding plate 19, the sliding side seal plate 33, and the sliding side fixing plate 29.
[0027]
Subsequently, a two-dot chain line so as to correspond to the inner diameters of the first support hole 21 of the pressing plate 19, the fifth support hole 34 of the sliding side seal plate 33, and the fourth support hole 30 of the sliding side fixing plate 29. Is inserted from the holding plate 19 side toward the sliding side fixing plate 29. At this time, the inner peripheral edge of the fifth support hole 34 comes into close contact with the outer peripheral surface of the sheath tube 11 as the sheath tube 11 is inserted, and a gap between the inner peripheral edge of the fifth support hole 34 and the outer peripheral surface of the sheath tube 11 is formed. Seal. Further, the sheath tube 11 inserted into the support holes 21, 30, 34 is inserted so as to protrude from the sliding side fixing plate 29 by a predetermined length and to have an extra length portion 41.
[0028]
The extra length portion 41 protruding from the sliding side fixing plate 29 is fitted with a sheath tube band 36 formed of stainless steel in an annular shape at a slightly inward position from the end portion of the sheath tube 11, and this sheath. The tube band 36 is pressed and fixed to the sheath tube 11 so that it does not come out of the sheath tube 11.
[0029]
Finally, the fifth fixing hole 39 of the sliding-side seal plate 33 and the fourth fixing hole 32 of the sliding-side fixing plate 29 fixed by screwing the bolt portion 31 and the nut 40b are buried in the underground buried box 13. The bolts 37 are inserted into the first fixing holes 16, and the bolts 37 are screwed into the first fixing holes 16. As a result, as shown in FIG. 5, the sliding side support portion 42 is configured, and the sheath tube 11 is connected so as to protrude from the sliding side fixing plate 29 by a predetermined length and to have an extra length portion 41. .
[0030]
Therefore, as shown in FIG. 5, one end of the sheath tube 11 is connected to the fixed-side support portion 38 in a state having almost no extra length portion 41, and the other end portion is an extra length portion 41 inward of the underground box 13. It connects to the sliding side support part 42 so that it may have.
[0031]
As shown in FIG. 1, end portions of the sheath tube 11 connected to opposing positions in the underground burying box 13 are connected by a connecting tube 43. The connecting pipe 43 is formed in a cylindrical shape from a synthetic resin, and has a female screw portion (not shown) on which the screws can be screwed on the outer periphery of both the openings 44a and 44b. The inner diameters of both the openings 44a and 44b of the connecting pipe 43 can be reduced by screwing the screw into the female screw portion.
[0032]
First, the screwing of the connecting pipe 43 is released, the diameters of the openings 44a and 44b are expanded, and the ends of the sheath pipe 11 are inserted into the openings 44a and 44b, respectively. Then, a screw is screwed into the female thread portion to reduce the diameters of both openings 44a and 44b of the connecting pipe 43. As a result, as the diameters of both the openings 44 a and 44 b of the connection pipe 43 are reduced, the ends of the sheath pipe 11 are pressed and fixed by the connection pipe 43, and the ends of the sheath pipe 11 are connected to each other via the connection pipe 43. .
[0033]
When the wiring 12 is inserted into the sheath tube 11 connected via the connection tube 43, first, the parachute body is connected to the tip of the pull-in rope, and the parachute body is connected to the inside of the sheath tube 11 from one end side of the sheath tube 11. In And air is sent into the inside from the one end side of the sheath tube 11, and the pulling rope is passed through the sheath tube 11 by moving the parachute body receiving the air toward the other end side of the sheath tube 11. To the other end. Next, the wiring 12 is connected to the drawing rope sent to the other end side of the sheath tube 11, and the drawing rope is pulled back from one end side of the sheath tube 11, so that the wiring 12 is inside the sheath tube 11 as shown in FIG. Is laid. After the wiring 12 is laid in the sheath tube 11, the screw of the connection tube 43 is removed from the female screw portion, both the openings 44 a and 44 b of the connection tube 43 are expanded, and the connection tube 43 extends from the end of the sheath tube 11. Remove.
[0034]
Here, when a minus temperature difference of 10 ° C. or more occurs from the time when the sheath tube 11 is laid, the sheath tube 11 tends to contract. However, one end portion of the sheath tube 11 is fixedly connected to the stationary side support portion 38 of the underground burying box 13 in a state where the extra length portion 41 is not movable, and the other end portion is connected to the expansion and contraction of the sheath tube 11. It is connected to the sliding side support portion 42 with the extra length portion 41 so as to enable the accompanying sliding. Therefore, the other end portion of the sheath tube 11 is allowed to enter the outer cylinder 18 by the length of the extra length portion 41. As a result, it is possible to prevent a problem that the sheath tube 11 is broken or the other end portion of the sheath tube 11 enters the inner back portion of the outer cylinder 18.
[0035]
On the other hand, when a plus temperature difference of 10 ° C. or more occurs from the time when the sheath tube 11 is laid, the sheath tube 11 tends to extend. However, since the other end portion of the sheath tube 11 is connected to the sliding side support portion 42 so as to be slidable along with the extension of the sheath tube 11, it is buried in the ground as much as the sheath tube 11 extends. Move into the box 13. As a result, it is possible to prevent the sheath tube 11 from meandering in the outer cylinder 18 as when both ends of the sheath tube 11 are fixed to the underground box 13 so as not to move.
[0036]
Therefore, even when a minus or plus temperature difference of 10 ° C. or more occurs from the time when the sheath tube 11 is laid, the work of feeding the parachute body into the sheath tube 11 can be easily performed, and the wiring 12 can be expanded. This can be done easily without any problems. The sliding side seal plate 33 is fixed between the sliding side fixing plate 29 and the pressing plate 19. Therefore, when expansion and contraction of the sheath tube 11 occurs, the movement of the sliding side seal plate 33 accompanying the expansion and contraction can be prevented.
[0037]
As described above, according to the connection structure of the sheath tube 11 to the underground box 13 of this embodiment, the following effects are exhibited.
(1) According to the connection structure of the sheath tube 11 to the underground burying box 13 of this embodiment, one end portion of the sheath tube 11 does not have the extra length portion 41 and is supported on the fixed side of the underground burying box 13. The other end portion is fixedly connected to the portion 38 and the other end portion is supported on the sliding side of the underground buried box 13 with the extra length portion 41 so as to be slidable along with expansion and contraction of the sheath tube 11. Connected to the unit 42. Therefore, even when the sheath tube 11 contracts, the sheath tube 11 can be allowed to enter the outer cylinder 18 by the length of the extra length portion 41. As a result, it is possible to prevent problems such as breakage due to contraction of the sheath tube 11 or an end portion of the sheath tube 11 entering the inner back portion of the outer cylinder 18. On the other hand, when the sheath tube 11 extends, the sheath tube 11 moves into the underground burying box 13 as much as the other end of the sheath tube 11 extends. As a result, it is possible to prevent the sheath tube 11 from meandering in the outer cylinder 18 as when both ends of the sheath tube 11 are fixed to the underground box 13 so as not to move. Therefore, the operation of feeding the parachute into the sheath tube 11 can be performed without hindrance, and the wiring operation of the wiring 12 can be easily performed.
[0038]
(2) According to the connection structure of the sheath tube 11 to the underground burying box 13 of this embodiment, each support is provided at the end of the sheath tube 11 connected to both the support portions 38 and 42 of the underground burying box 13. A sheath tube band 36 having an outer diameter larger than the inner diameter of the holes 21, 23, 27, 30, 34 is attached. Therefore, when the sheath tube 11 expands and contracts, the sheath tube 11 can be prevented from coming out of the support holes 21, 23, 27, 30, 34.
[0039]
(3) According to the connection structure of the sheath pipe 11 to the underground box 13 of this embodiment, one end of the sheath pipe 11 is fixedly connected to the underground box 13 so as not to move. Therefore, the length of the surplus length portion 41 at the other end of the sheath tube 11 can be easily measured, and the length of the surplus length portion 41 can be set almost accurately.
[0040]
(4) According to the connection structure of the sheath tube 11 to the underground burying box 13 of this embodiment, the sheath tube 11 connected to both the support portions 38 and 42 provided at positions facing the underground burying box 13. The connecting pipe 43 can be connected between the opposite ends. Therefore, the plurality of sheath tubes 11 can be coupled via the coupling tube 43, and the inside of the plurality of sheath tubes 11 to which the wiring 12 is coupled can be inserted at a time.
[0041]
(5) According to the connection structure of the sheath tube 11 to the underground burying box 13 of this embodiment, the fixed side support portion 38 on the one end portion side of the sheath tube 11 is fixed to the inner wall of the underground burying box 13. The seal plate 26, the fixed-side fixing plate 22 and the pressing plate 19 are attached in the order described above. A sheath tube band 36 that is pressed and fixed to the end portion of the sheath tube 11 is sandwiched between the fixed plate 22 for the fixed side and the pressing plate 19. Therefore, it is possible to prevent the sheath tube 11 from moving by preventing the sheath tube band 36 from moving by the pressing plate 19 and the fixed plate 22 for the fixed side.
[0042]
(6) According to the connection structure of the sheath tube 11 to the underground box 13 of this embodiment, the sliding side support portion 42 on the other end side of the sheath tube 11 is pressed against the inner wall of the underground box 13. The plate 19, the sliding side seal plate 33, and the sliding side fixing plate 29 are attached in the order described above. Therefore, the movement of the sliding side seal plate 33 accompanying the expansion and contraction of the sheath tube 11 can be prevented by the sandwiching configuration of the pressing plate 19 and the sliding side fixing plate 29.
[0043]
(7) According to the connection structure of the sheath tube 11 to the underground buried box 13 of this embodiment, the third support hole 27 of the fixed-side seal plate 26 and the fifth support hole 34 of the sliding-side seal plate 33. The inner diameter is formed slightly smaller than the outer diameter of the sheath tube 11 corresponding to the inner diameter. Therefore, the inner peripheral edge of the third support hole 27 or the fifth support hole 34 is in close contact with the outer peripheral surface of the sheath tube 11 inserted through them. Accordingly, the gap between the inner peripheral edge of the third support hole 27 or the fifth support hole 34 and the outer peripheral surface of the sheath tube 11 inserted therethrough is sealed, and dust is generated from the underground box 13 into the outer cylinder 18. And water can be prevented from entering.
[0044]
(8) According to the connection structure of the sheath tube 11 to the underground box 13 of this embodiment, one surface of the fixed side seal plate 26 and the sliding side seal plate 33 is in close contact with the inner wall of the underground box 13. And the space between the inner wall and the fixed-side seal plate 26 and the sliding-side seal plate 33 is sealed. Therefore, it is possible to prevent dust and water from entering the outer cylinder 18 from the through hole 15 of the underground box 13.
[0045]
(9) According to the connection structure of the sheath tube 11 to the underground burying box 13 of this embodiment, the bolt portions 31 are formed at six positions on the sliding side fixing plate 29 at a predetermined interval. . Therefore, the bolt part 31 is inserted into the second bolt hole 35 of the sliding side seal plate 33 and the first bolt hole 20 of the presser plate 19, and the bolt part 31 protruding to the presser plate 19 side is inserted through the washer 40 a. By screwing the nut 40b, the holding plate 19, the sliding side seal plate 33, and the sliding side fixing plate 29 can be fixed. Therefore, for example, compared to the case where a separate bolt is inserted into each bolt hole of the sliding side fixing plate, the sliding side sealing plate and the holding plate each having a bolt hole formed on the same axis, The work can be simplified and the working time can be shortened.
[0046]
(10) According to the connection structure of the sheath tube 11 to the underground burying box 13 of this embodiment, the fixing side fixing plate 22 is formed with six nut portions 24 at predetermined intervals. An internal thread is formed on the inner peripheral surface of 24. Therefore, the press plate 19 can be fixed to the fixed plate 22 for fixing by inserting the bolt 37 from the first bolt hole 20 formed in the press plate 19 into the nut portion 24 and screwing it. Therefore, for example, compared with the case where a bolt is inserted into each bolt hole of a holding plate and a fixing plate for a fixed side each having a bolt hole formed on the same axis, and the bolt is screwed into a separate nut, The work can be simplified and the working time can be shortened.
[0047]
(11) According to the connection structure of the sheath tube 11 to the underground buried box 13 of this embodiment, the height of the nut portion 24 formed on the stationary-side fixing plate 22 is the same as the thickness of the sheath tube band 36. It has become. For this reason, when the sheath tube band 36 is sandwiched between the retainer plate 19 and the fixed plate 22 for the fixed side, the retainer plate 19 can be prevented from coming into contact with the sheath tube band 36 and becoming unstable. . As a result, the presser plate 19 can be reliably fixed to the fixed-side fixing plate 22.
[0048]
It should be noted that the embodiment can be modified and embodied as follows.
For example, when the installation work time of the sheath tube 11 is a low temperature time such as winter, the pressing plate 19, the sliding side seal 33 plate and the sliding side fixing plate 29 are provided on the inner wall of the underground buried box 13. One end portion of the sheath tube 11 is connected to the sliding side support portion 42 attached in this order without the extra length portion 41, and the pressing plate 19 and the sliding side seal are attached to the inner wall of the underground buried box 13. The other end portion of the sheath tube 11 may be connected to the sliding side support portion 42 attached in the order of the plate 33 and the sliding side fixing plate 29 in a state where the other length portion 41 does not have the extra length portion 41. When comprised in this way, when the plus temperature difference more than predetermined exceeds the said work time in the summer, the sheath pipe 11 will expand | extend. However, since both end portions of the sheath tube 11 are inserted in the non-fixed state into the sliding side support portion 42 so as to allow the sheath tube 11 to slide in accordance with the extension, the portion of the sheath tube 11 extends underground. It moves so as to protrude into the buried box 13. As a result, it is possible to prevent the sheath tube 11 from meandering in the outer cylinder 18 as when both ends of the sheath tube 11 are fixed to the underground box 13 so as not to move.
[0049]
One end portion of the sheath tube 11 is left on the sliding side support portion 42 which is attached to the inner wall of the underground box 13 in the order of the holding plate 19, the sliding side sealing plate 33, and the sliding side fixing plate 29. The sliding side support portion 42 is connected in a state having the long portion 41 and is attached to the inner wall of the underground burying box 13 in the order of the pressing plate 19, the sliding side sealing plate 33, and the sliding side fixing plate 29. In addition, the other end portion of the sheath tube 11 may be connected without the extra length portion 41. Also when comprised in this way, the malfunction by expansion / contraction of the sheath tube 11 can be prevented.
[0052]
In place of the sheath tube band 36, an O-ring formed of a soft material such as rubber may be used. When comprised in this way, when an O-ring is fitted to the end of the sheath tube 11, the O-ring expands and deforms, and the diameter is reduced to press and fix the outer peripheral surface of the sheath tube 11. Therefore, it is possible to prevent the O-ring from coming out from the end portion of the sheath tube 11.
[0053]
A support hole may be formed directly on the side wall of the underground box 13, and at least one end of the sheath tube 11 may be connected to the support hole so as to be slidable along with the expansion and contraction. At this time, a seal plate in which a support hole corresponding to the support hole is formed may be attached to the side wall of the underground box 13. Also when comprised in this way, the effect similar to embodiment can be exhibited.
[0054]
-When inserting piping, such as a water supply pipe, in the sheath pipe 11, you may employ | adopt the connection structure of the said sheath pipe 11. FIG.
Furthermore, the technical idea grasped from the embodiment will be described below.
[0055]
The sheath for the underground burial box according to claim 2, wherein the restricting means is an annular body that has an outer diameter larger than an inner diameter of a support hole formed in the support portion and can be fitted into the sheath pipe. Pipe connection structure. When comprised in this way, the outer diameter of the edge part of a sheath pipe can be made larger than the internal diameter of a support hole by fitting an annular body to the edge part of a sheath pipe. Therefore, it is possible to prevent the sheath tube from coming out of the support hole in the outer cylinder direction.
[0056]
  · PreviousNoteThe inner diameter of the support hole formed in the steel plate is formed slightly smaller than the outer diameter of the sheath tube inserted through the support hole.1The connection structure of the sheath pipe to the underground burial box as described in 2. When configured in this manner, the inner peripheral edge of the support hole of the seal plate is in close contact with the outer peripheral surface of the sheath tube inserted through the support hole, and a gap between the inner peripheral edge of the support hole and the outer peripheral surface of the sheath tube is formed. Seal. Therefore, it is possible to prevent dust and water from entering the outer cylinder.
[0057]
The regulating means is formed so as to have an outer diameter larger than the inner diameter of the support hole formed in the support portion, and is configured by an annular body that can be fitted into the sheath pipe, and the annular body is an end portion of the sheath pipe The connection structure of the sheath pipe to the underground burial box according to claim 2, which is fitted to an inner position slightly more. When comprised in this way, an annular body is fitted in a slightly inward position from the edge part of a sheath pipe. Therefore, both ends of the connecting tube can be fitted to the end of the sheath tube, and the sheath tube can be connected via the connecting tube.
[0058]
  -When connecting the end portion of the sheath tube to the support portion with a surplus length portion, the support portion is configured by attaching the pressing plate, the seal plate, and the fixing plate in this order from the inner wall side of the underground box. Claim5The connection structure of the sheath pipe to the underground burial box as described in 2. When comprised in this way, the movement of the sealing plate by the sliding accompanying the expansion and contraction of the sheath tube can be prevented by the pressing plate and the fixing plate.
[0059]
  When the end portion of the sheath tube is fixedly connected to the support portion so as to be immovable, the support portion is configured by attaching a seal plate, a fixing plate, and a holding plate in this order from the inner wall side of the underground burial box. Claims wherein a regulating means provided at an end of the sheath tube is sandwiched between the plate and the holding plate5The connection structure of the sheath pipe to the underground burial box as described in 2. When comprised in this way, the control means provided in the edge part of a sheath pipe is inserted | pinched between the pressing board and the fixed board, and cannot move. Therefore, sliding along with expansion and contraction of the sheath tube can be prevented, and the sheath tube can be prevented from entering the outer cylinder.
[0060]
【The invention's effect】
  According to the first aspect of the present invention, it is possible to easily perform the work of laying the wiring between the underground burial boxes without problems caused by expansion and contraction of the sheath tube.In addition, dust and water can be prevented from entering the outer cylinder from the through hole of the underground box, and the seal plate seals the gap between the inner periphery of the support hole and the outer peripheral surface of the sheath tube. Thus, dust and water can be prevented from entering the outer cylinder. Furthermore, the work can be simplified and the working time can be shortened as compared with the case of processing the support hole in the underground box.
[0061]
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, it is possible to prevent the sheath tube from entering the outer cylinder.
According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the length of the extra length of the other end of the sheath tube can be easily measured, The length of the long portion can be set almost accurately.
[0062]
According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, the ends of the sheath pipes positioned so as to face each other can be connected. The laying operation can be easily performed.
[0063]
  According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1-4,The seal plate can be fixed to the underground burying box so as to be immovable by the pressing plate and the fixing plate or the fixing plate.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a connection structure of a sheath pipe to an underground burial box according to an embodiment.
FIG. 2 is an exploded perspective view showing a fixed side support portion.
FIG. 3 is an exploded perspective view showing a sliding side support portion.
FIG. 4 is a sectional view showing a state in which an outer cylinder is connected between underground boxes.
FIG. 5 is a cross-sectional view showing a state in which both ends of a sheath tube in the outer cylinder are connected.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Sheath pipe, 12 ... Wiring, 13 ... Underground box, 18 ... Outer cylinder, 19 ... Holding plate as support plate, 21 ... First support hole as support hole, 22 ... For fixed side as support plate Fixed plate, 23 ... second support hole as support hole, 26 ... fixed side sealing plate as support plate, 27 ... third support hole as support hole, 29 ... sliding side fixed plate as support plate, 30 ... Fourth support hole as support hole, 33 ... Sliding side seal plate as support plate, 34 ... Fifth support hole as support hole, 36 ... Sheath tube band as regulating means, 38 ... As support portion Fixed side support part, 41 ... extra length part, 42 ... sliding side support part as a support part, 43 ... connecting pipe.

Claims (5)

地中埋設箱の側壁には貫通孔が形成され、離間配置された前記地中埋設箱同士を地中で連結する外筒内に挿通される鞘管であって、その管内に配線又は配管等が布設される鞘管を前記地中埋設箱に接続する構造において、
前記外筒内に挿通された鞘管の両端部を、前記地中埋設箱の側壁に設けられた支持部に挿通支持させて同地中埋設箱内にそれぞれ臨ませ、前記鞘管の少なくとも一端部を前記支持部に対して、鞘管の伸縮に伴う摺動を可能とするように接続してなり、
前記支持部は、前記側壁の貫通孔を覆うとともに前記鞘管を挿通支持可能な複数の支持孔が形成されたシール板と、そのシール板全体を押圧して該シール板を前記側壁の内壁に密接させる固定板とを備えた地中埋設箱への鞘管の接続構造。
The side walls of the underground box through hole is formed, a sheath tube which is inserted into the barrel for connecting the underground box each other are spaced in the ground, wiring or piping to the sheath tube In the structure for connecting the sheath pipe laid etc. to the underground box,
At least one end of the sheath tube, both ends of the sheath tube inserted into the outer cylinder are inserted into and supported by the support portions provided on the side walls of the underground box, and faced in the underground box. The part is connected to the support part so as to allow sliding with expansion and contraction of the sheath tube ,
The support portion covers a through hole in the side wall and has a seal plate formed with a plurality of support holes through which the sheath tube can be inserted and supported, and presses the entire seal plate to attach the seal plate to the inner wall of the side wall. Connection structure of a sheath tube to an underground burial box provided with a fixed plate to be brought into close contact with .
前記鞘管の両端部には、鞘管の支持部からの抜けを規制する規制手段が備えられている請求項1に記載の地中埋設箱への鞘管の接続構造。  The connection structure of the sheath pipe to the underground burial box according to claim 1, wherein the both ends of the sheath pipe are provided with restricting means for restricting removal of the sheath pipe from the support portion. 前記鞘管の一端部は鞘管の伸縮に伴う摺動を可能とするように前記支持部から地中埋設箱内へ突出するように余長部を有して接続され、他端部は支持部に移動不能に固定して接続される請求項1又は請求項2に記載の地中埋設箱への鞘管の接続構造。  One end of the sheath tube is connected with an extra length so as to protrude from the support portion into the underground box so as to allow sliding with expansion and contraction of the sheath tube, and the other end portion is supported. The connection structure of the sheath pipe to the underground burial box according to claim 1 or 2, which is fixedly connected to the portion so as not to move. 同じ地中埋設箱内に接続された鞘管の端部同士は連結管を介して連結される請求項1〜3のうちいずれか一項に記載の地中埋設箱への鞘管の接続構造。  The connection structure of the sheath pipe to the underground burial box according to any one of claims 1 to 3, wherein ends of the sheath pipes connected to each other in the same underground burial box are coupled via a coupling pipe. . 前記支持部は固定板、シール板及び押さえ板を組み付けて構成されるとともに、鞘管を挿通支持可能な支持孔がそれぞれ形成されている請求項1〜4のうちいずれか一項に記載の地中埋設箱への鞘管の接続構造 The ground according to any one of claims 1 to 4, wherein the support portion is configured by assembling a fixing plate, a seal plate, and a pressing plate, and is formed with support holes capable of inserting and supporting the sheath tube. Connection structure of the sheath tube to the buried box .
JP28776498A 1998-10-09 1998-10-09 Connection structure of sheath pipe to underground box Expired - Fee Related JP3673096B2 (en)

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Application Number Priority Date Filing Date Title
JP28776498A JP3673096B2 (en) 1998-10-09 1998-10-09 Connection structure of sheath pipe to underground box

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JP3673096B2 true JP3673096B2 (en) 2005-07-20

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JP3954410B2 (en) * 2002-02-28 2007-08-08 未来工業株式会社 Fixing device for sheath pipes to underground box

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