JP3745664B2

JP3745664B2 - Underdrain fittings

Info

Publication number: JP3745664B2
Application number: JP2001290805A
Authority: JP
Inventors: 吉則浅沼; 敬士小沼
Original assignee: 西武ポリマ化成株式会社
Priority date: 2001-09-25
Filing date: 2001-09-25
Publication date: 2006-02-15
Anticipated expiration: 2021-09-25
Also published as: JP2003097194A

Description

【０００１】
【発明の属する技術分野】
本発明は、シールドトンネル、上下水道、共同溝、地下道等の暗渠の接続に用いられる可撓継手に関し、特にシールド工事の発進部および到達部におけるシールドトンネル管路と立坑の接続に使用して好適な可撓継手に関する。
【０００２】
【従来の技術】
一般に、地盤の不等沈下や伸縮による暗渠の破損を防止するために、複数の暗渠の対向端部どうしを伸縮可能な構造の継手によって接続している。このような継手として、たとえば図１４に部分断面図を示すシールドトンネル用の可撓継手がある。この継手Ａは１対のリング状の主桁ａ，ａを供え、これら主桁ａ，ａはそれぞれ内主桁ａ１と外主桁ａ２を短筒状の連結部材ｂにより連結してなるものである。短筒状の可撓止水部材ｃはその両端壁を万力状の押え部材ｄにより内主桁ａ１に固定されており、外主桁ａ２は隣接する一般セグメントｅの端壁にボルト止めされている。なお、ｆ、ｇはスポンジ等の目地材である。
【０００３】
【発明が解決しようとする課題】
従来の可撓継手は上記のように１対の主桁がそれぞれ内主桁と外主桁の２枚を連結部材で連結してなる合計４枚の主桁構造である。地盤が不安定で比較的に大きな不等沈下が予想される場所では可撓継手によって接続される２つの暗渠の間の相対変位量が大きく、可撓継手の幅を充分大きくとらないとこのような大きな相対変位量に対応できないので、可撓継手の幅を大きくとり、このため土圧による大きな荷重が継手にかかるので、この荷重を支えるためにこのような４枚主桁構造が必要とされていた。
【０００４】
しかしこのような４枚主桁構造は広い設置スペースを必要とし、このためトンネル、立坑等の掘削量を増加しなければならず不経済であるばかりでなく、可撓継手の製造コストも高価であり、その上施工においても可撓止水部材の内主桁への取り付けおよび外主桁の対応する暗渠への取付を施工現場で行わなければならないので施工に手間がかかり可撓継手の施工コストも高価となるという欠点があった。
【０００５】
上記従来の可撓継手は地盤が不安定で比較的に大きな不等沈下が予測される場所ばかりでなく、比較的に地盤が安定しており大きな不等沈下は予測されない場所においても同様に使用されている。しかし、地盤が比較的に安定しており予想される暗渠間の相対変位量が比較的に小さい場合は、可撓継手にかかる土圧による荷重も比較的に小さいので、可撓継手の幅を小さくしても差し支えないものと考えられ、必ずしも従来の主桁の構造にとらわれる必要はないものと考えられる。
【０００６】
本発明は、このような視点からなされたものであって、予想される暗渠間の不等沈下による相対変位が比較的に小幅な場合に用いて好適な暗渠の継手であって従来の継手に比べて設置スペースが少なくすみ、施工も簡単で製造コストおよび施工コストを軽減できる暗渠の継手を提供しようとするものである。
【０００７】
【課題を解決する手段】
上記本発明の目的を達成する本発明の可撓継手は、軸方向に所定の間隔を置いて配置された１対のリング状の主桁と、該１対の主桁の間に配置されたゴム・合成樹脂等からなる短筒状の可撓止水部材と、該可撓止水部材の内周側の端壁間に配置された１対のリング状の可撓止水部材押え板とを備え、該１対の可撓止水部材押え板をボルト等の固定部材によりそれぞれ対応する主桁に固定し、該１対の主桁と該可撓止水部材と該可撓止水部材押え板とを１体に組立て固定するとともに、該主桁の少なくとも一方を対応する暗渠の端部にボルト等の固定部材により固定したことを特徴とする。
【０００８】
本発明の一側面において、暗渠の継手は、該主桁の一方の外周縁から軸方向外側に張出す短筒状のスキンプレート張出し部と、該スキンプレート張出し部から半径方向外側に張出すようにして該スキンプレートに固着されたリング状の止水板とをさらに備え、該スキンプレート張出し部をシールドトンネル立坑壁内に固定し、該主桁の他方をシールドトンネルの一般セグメントに固定したことを特徴とする。
【０００９】
【作用】
本発明によれば、２枚の主桁のそれぞれが、可撓止水部材押え板を固定する主桁としての機能および継手を対応する暗渠の端部に取付けるための主桁としての機能すなわち従来の継手の内主桁と外主桁の双方の機能を１本の主桁で受け持つので、従来の４枚の主桁を２枚の主桁に減少させることができる。したがって、従来の継手に比べて継手の設置スペースを節約することができ、継手の製造コストをも削減することができる。また、この構造により継手全体を工場で一体的に組立てて施工現場に搬入することが可能となるので、施工現場では継手を対応する暗渠の端部にボルト等で固定するだけの工事ですみ、施工が簡単となり、施工コストも削減することができる。
【００１０】
また、本発明の一側面においては、継手の２枚の主桁の中一方の主桁に設けたスキンプレート張出し部を立坑壁内に固定し他方の主桁をシールドトンネルの一般セグメントに接続することにより、簡単な構造でシールド工事の発進部および到達部におけるシールドトンネル管路と立坑を接続することができる。
【００１１】
【発明の実施の態様】
以下添付図面を参照して本発明の実施の態様について説明する。
図１〜図６は本発明にかかる継手をシールド工法によって構築されるシールドトンネルの一般セグメントどうしの接続に適用した実施態様を示すもので、図１は可撓継手の正面図、図２は図１中Ａ−Ａ線による部分断面図、図３中左半分は図１中Ａ−Ａ線による部分断面図、右半分は図１中Ｂ−Ｂ線による部分断面図、図４は可撓止水部材の断面図、図５は可撓止水部材押え板の断面図、図６は吊り金具兼幅止め材の斜視図である。
【００１２】
継手１は、軸方向に所定の間隔を置いて配置された１対のリング状の主桁２，２を備え、各主桁２には、図１から明らかなように、周方向に所定のピッチで可撓止水部材押え板取付けボルト挿通孔３が軸方向に開設されている。可撓止水部材押え板取付けボルト挿通孔３は、図３に示すように、ざぐり部３ａとその軸方向内側に形成されたざぐり部３ａよりも小径の挿通孔３ｂからなる。また、周方向に可撓止水部材押え板取付けボルト挿通孔３の整数倍のピッチで一般セグメント取付けボルト用ネジ孔４が隣合う可撓止水部材押え板取付けボルト挿通孔３の中間に位置するようにして開設されている。
【００１３】
主桁２，２間に配置される可撓止水部材５はゴム・合成樹脂等可撓性および伸縮性を有する短筒状部材からなり、軸方向中央部において厚みが小さく形成されており、軸方向両端部は内周側に延長して端壁５ａが形成されている。この端壁５ａの最内周端には軸方向内側に折曲がるようにして後述の押え板係合凹部６ｄと係合するための係合突部５ｂが端壁５ａと一体に形成されている。係合突部５ｂの内周面は、継手を組立てるとき可撓止水部材押え板取付けボルト挿通孔３の位置よりも所定寸法だけ半径方向外側に位置するように設計されている。可撓止水部材５の内周側には補強布１５が埋設されている。
【００１４】
１対のリング状可撓止水部材押え板６は、図５に示す断面を有し、複数の円弧状の鋼材からなる部材を周方向に連続して形成される。可撓止水部材押え板６は主桁２よりも所定の寸法だけ小径に設計されている。可撓止水部材押え板６は主桁取付け部６ａとその外周側に一体的に形成された可撓止水部材係止部６ｂからなり、主桁取付け部６ａの厚みは各可撓止水部材押え板６の軸方向外側面を対応する主桁２の内側面に当接させたとき両押え板６の間に継手の許容縮小変位値に相当する所定の間隔が形成されるような値に設定される。押え板６の可撓止水部材係止部６ｂは、主桁取付け部６ａの外側面よりも軸方向内側に引っ込んだ外側面を有し可撓止水部材５の端壁５ａの内側面に当接する端壁当接部６ｃと、その半径方向内側に隣接してさらに軸方向内側に引っ込み可撓止水部材５の係合突部５ｂと係合する係合凹部６ｄからなる。
【００１５】
可撓止水部材押え板６には、図３に示すように、主桁２の各可撓止水部材押え板取付けボルト挿通孔３に対応する位置に可撓止水部材押え板取付けボルト用ネジ孔７が開設されている。
【００１６】
可撓止水部材押え板６は可撓止水部材押え板取付けボルト挿通孔３に挿通され可撓止水部材押え板取付けボルト用ネジ孔７にねじこまれた押え板取付けボルト８によって対応する主桁２に固定されている。またこれによって可撓止水部材５は可撓止水部材押え板６，６によって主桁２，２に対して押圧固定されている。押え板取付けボルト８のボルトヘッドは一般セグメント９の端壁９ａと干渉しないようにざぐり部３ａ内に収容されている。
【００１７】
可撓止水部材押え板６，６の間には発泡ウレタン等からなる目地材１０が介装されている。また主桁２，２に跨るようにして薄い鋼板からなるカバープレート１１が配置され、その一端部を対応する主桁２の外周面に溶接されている。
【００１８】
各主桁２に対応する一般セグメント９の端壁９ａには主桁２の一般セグメント取付けボルト用ネジ孔４に対応する位置にボルト挿通孔９ｂが開設されており、主桁２はボルト挿通孔９ｂから一般セグメント取付けボルト用ネジ孔４にねじこまれた一般セグメント取付けボルト１０によって一般セグメント９に固定されている。
【００１９】
主桁２，２の頂部には周方向の２箇所に、図６に示すような鋼製の吊り金具兼幅止め材１２が設けられている。吊り金具兼幅止め材１２は、その両端を主桁２，２に溶接された吊り金具固定部材１３，１３の内側面に溶接固定されており、中央部にロープ孔１２ａが形成されている。また主桁２，２の下部には吊り金具兼幅止め材１２と同一構成の幅止め材１４が周方向の２〜４箇所に設けられている。
【００２０】
次にこの継手１の施工方法について説明する。
工場において、１対の主桁２，２を所定の間隔に配置し、吊り金具兼幅止め材１２および幅止め材１４を所定の位置に溶接固定する。次に１対の主桁２，２間に可撓止水部材５を配置し、可撓止水部材押え板６，６をその可撓止水部材係止部６ｂの端壁当接部６ｃを可撓止水部材５の端壁５ａに当接させ、係合凹部６ｄに可撓止水部材５の係合突部５ｂを係合させるようにして可撓止水部材の内周側に配置し、可撓止水部材押え板６，６を押え板取付けボルト８によって主桁２，２に固定する。
【００２１】
こうして工場で組立てた継手１をシールドトンネル施工現場に輸送し、吊り金具兼幅止め材１２にロープをつないで立坑内に継手を吊り下ろし、シールドトンネルとの接合箇所に搬入する。次いで主桁２を対応する一般セグメント９の端壁９ａに一般セグメント取付けボルト１０によって取付け固定する。次いで吊り金具兼幅止め材１２および幅止め材１４を図６中破線で示す位置においてガス切断により切断し、継手１の伸張を可能とする。
【００２２】
次にこの継手１の動作について説明する。
セグメント９，９が変位しない平常の状態においては、可撓止水部材５は押え板６，６によって支持されており、可撓止水部材５に外周側から加わる圧力は押え板６，６によって均一に支持され、可撓止水部材５に発生する引張り応力は最小限に押えられる。セグメント９，９がその相互間の間隔が拡がる方向に相対的に変位した場合は、可撓止水部材５の中央部が伸張して継手１の伸張変位を許容する。また逆にセグメント９，９がその相互間の間隔が狭まる方向に相対的に変位した場合は、目地材１０が圧縮され継手１の圧縮変位を許容する。セグメント９，９のいずれかが不等沈下した場合も可撓止水部材押え板６のせん断変位に追従して可撓止水部材５がせん断変位する。
【００２３】
次に、本発明の他の実施態様について説明する。
図７〜図１３は本発明をシールド工事の発進部または到達部におけるシールドトンネル管路と立坑の接続に適用した実施態様を示すもので、図７は可撓継手の正面図、図８は一般セグメントを取付けた状態における図７中Ｃ−Ｃ線による部分断面図、図９は可撓止水部材の断面図、図１０は可撓止水部材押え板の断面図、図１１は一般セグメント取付け側の主桁に一般セグメントを取付けた状態を示す断面図、図１２は一般セグメント取付け側の主桁に可撓止水部材押え板を取付けた状態を示す断面図、図１３は継手の施工を完了した状態におけるＣ−Ｃ線による部分断面図である。
【００２４】
継手２０は、図８に示すように、軸方向に所定の間隔を置いて配置された１対のリング状の主桁２１、２２を備える。主桁２１は立坑壁取付け側の主桁であり、主桁２２は一般セグメント取付け側の主桁である。立坑壁取付け側主桁２１には、図７に示すように、周方向に所定のピッチで可撓止水部材押え板取付けボルト挿通孔２４が軸方向に開設されている。また、周方向に可撓止水部材押え板取付けボルト挿通孔２４の２倍のピッチで一般セグメント取付けボルト挿通孔２３が隣合う可撓止水部材押え板取付けボルト挿通孔２４の中間に２つづつ入るようにして開設されている。一般セグメント取付け側の主桁２２には同様の配列で可撓止水部材押え板取付けボルト用ネジ孔２５と一般セグメント取付けボルト挿通孔２６（図１１の皿ボルト挿通孔）が開設されている。なお、この実施形態においては主桁２１には一般セグメントを固定しないので、一般セグメント取付けボルト挿通孔２３は加工されていない。
【００２５】
主桁２１、２２に跨るようにして鋼製の短筒状スキンプレート２７が配置されており、各主桁２１、２２の外周面に溶接されている。このスキンプレート２７の中央部は継手２０の伸縮変位を許容するように周方向に切取られて開口部２７ａが形成されている。また、スキンプレート２７と連続して一体的に立坑壁取付け側主桁２１の外周縁から軸方向外側に張出すようにして短筒状のスキンプレート張出し部２８が形成されている。
【００２６】
スキンプレート張出し部２８の内周面には、立坑壁取付け側主桁２１の隣合う可撓止水部材押え板取付けボルト挿通孔２４の中間位置において補強リブ２９が溶接されている。
【００２７】
スキンプレート張出し部２８の外周面には半径方向外側に張出すようにして軸方向に延長するリング状の鋼製止水板３０が溶接されている。
【００２８】
主桁２１、２２間に配置される可撓止水部材３１はゴム・合成樹脂等可撓性および伸縮性を有する短筒状部材からなり、軸方向中央部には内周側に膨出する膨出部３１ｃが形成され、その両側には平坦部３１ｄが形成されており、軸方向両端部は内周側に延長して端壁３１ａが形成されている。この端壁３１ａの外周端内側には後述の押え板係合突部と係合するための係合凹部３１ｂ（図９）が形成されている。端壁３１ａの内周面は、継手を組立てるとき可撓止水部材押え板取付けボルト挿通孔２３および取付けボルト用ネジ孔２５の位置よりも半径方向外側に位置するように設計されている。可撓止水部材３１内には補強布３２（図９）が埋設されている。
【００２９】
１対のリング状可撓止水部材押え板３３は、図１０に示す断面を有し、複数の円弧状の鋼材からなる部材を周方向に接合して形成される。可撓止水部材押え板３３は主桁２１、２２よりも所定の寸法だけ小径に設計されている。可撓止水部材押え板３３は主桁取付け部３４とその外周側に固定されたリング状の可撓止水部材支持係止部３５からなる。押え板３３の主桁取付け部３４の内周側の端部は軸方向外側に所定の長さだけ突出して位置決め用突出部３４ａが形成されている。押え板３３の可撓止水部材支持係止部３５は、可撓止水部材３１の平坦部３１ｄの内周面に合致する形状を有し平坦部３１ｄの内周面に当接する支持部３５ａとその軸方向外側において主桁取付け部３４の外側面から軸方向外側に突出し可撓止水部材３１の係合凹部３１ｂと係合する係合突部３５ｂからなる。
【００３０】
可撓止水部材押え板３３には、図１０に示すように、主桁２１の各可撓止水部材押え板取付けボルト挿通孔２３および主桁２２の取付けボルト用ネジ孔２５に対応する位置に可撓止水部材押え板取付けボルト挿通孔３６が開設されている。
【００３１】
立坑壁取付け側主桁２１に固定される可撓止水部材押え板３３は、主桁２１の可撓止水部材押え板取付けボルト挿通孔２３および押え板３３の取付けボルト挿通孔３６に挿通された押え板取付けボルト３７にナット３８を締め込むことによって主桁２１に固定されている。また一般セグメント取付け側主桁２２に固定される可撓止水部材押え板３３は、可撓止水部材押え板３３の取付けボルト挿通孔３６に挿通され主桁２２の取付けボルト用ネジ孔２５にねじこまれた押え板取り付け用ネジボルト３９によって主桁２２に固定されている。またこれによって可撓止水部材３１は可撓止水部材押え板３３，３３によって主桁２１、２２に対して押圧固定されている。
【００３２】
可撓止水部材押え板３３，３３の間には発泡ウレタン等からなる目地材４０が介装され、その内周側および外周側の主桁２１、２２の間には同様の目地材４１、４８が介装されている。またスキンプレート２７の開口部２７ａを覆うようにして薄い鋼板からなるカバープレート４２が配置され、その一端部はスキンプレート２７の外周面に溶接されている。
【００３３】
一般セグメント接続側主桁２２に対応する一般セグメント４３の端壁４３ａには主桁２２の一般セグメント取付けボルト挿通孔２６に対応する位置にボルト挿通孔４３ｂが開設されている。主桁２２のボルト挿通孔２６は皿ボルトの形状に合致する形状に形成されており、主桁２２は、ボルト挿通孔２６から一般セグメントのボルト挿通孔４３ｂに挿通された一般セグメント取付け用皿ボルト４４にナット４５を締め込むことによって一般セグメント４３に固定されている。
【００３４】
主桁２１、２２の頂部には周方向の２箇所に、鋼製の吊り金具兼幅止め材４６が設けられている。吊り金具兼幅止め材４６は、その両端を主桁２１、２２に溶接固定されており（その部分のカバープレート４２は部分的に切欠かれている）、中央部に２つのロープ孔４６ａが形成されている。また主桁２１、２２の下部には吊り金具兼幅止め材４６と同一構成の幅止め材４７が周方向の２箇所に設けられている。
【００３５】
次にこの継手１の施工方法について説明する。
工場において、スキンプレート２７、スキンプレート張出し部２８、止水板３０、リブ２９が取付けられた１対の主桁２１、２２間に可撓止水部材３１を配置し、可撓止水部材押え板３３，３３をその可撓止水部材支持係止部３５の支持部３５ａを可撓止水部材３１の平坦部３１ｄに当接させ、係合突部３５ｂを可撓止水部材３１の係合凹部３１ｂに係合させるようにして可撓止水部材３１の内周側に配置し、可撓止水部材押え板３３，３３を押え板取付けボルト３７、３９によって主桁２１、２２に固定する。次に吊り金具兼幅止め材４６および幅止め材４７を主桁２１、２２に溶接固定する。こうして工場で組立てた継手２０をシールドトンネル施工現場に輸送する。
【００３６】
施工現場においては、立坑の孔を掘った後吊り金具兼幅止め材４６にロープをつないで孔内に継手２０を吊り下ろし、次いで主桁２２を対応する一般セグメント４３の端壁４３ａに一般セグメント取付けボルトナット４４、４５によって取付け固定する。次いで立坑の型枠を作り、生コンクリートを打設して立坑壁４９を構築することにより、図１３に示すようにスキンプレート張出し部２８および止水板３０は立坑壁４９に埋設され、立坑壁４９からトンネル内への水の廻り込みが防止される。その後吊り金具兼幅止め材４６および幅止め材４７を図１３に示すように中央部においてガス切断し、継手２０の伸張を可能とする。
【００３７】
可撓継手２０の動作は継手１の動作と同様であるので、その説明を省略する。上記各実施形態は暗渠をシールド工法により構築する場合に本発明を適用した場合のものであるが、本発明はシールド工法に限らず推進工法等他の方法により構築される暗渠の継手にも適用しうるものである。
【００３８】
【発明の効果】
以上のべたように、本発明によれば、２枚の主桁のそれぞれが、可撓止水部材押え板を固定する主桁としての機能および継手を対応する暗渠の端部に取付けるための主桁としての機能すなわち従来の継手の内主桁と外主桁の双方の機能を１本の主桁で受け持つので、従来の４枚の主桁を２枚の主桁に減少させることができる。したがって、従来の継手に比べて継手の設置スペースを節約することができ、継手の製造コストをも削減することができる。また、この構造により継手全体を工場で一体的に組立てて施工現場に搬入することが可能となるので、施工現場では継手を対応する暗渠の端部にボルト等で固定するだけの工事ですみ、施工が簡単となり、施工コストも削減することができる。
【００３９】
また、本発明の一側面においては、継手の２枚の主桁の中一方の主桁に設けたスキンプレート張出し部を立坑壁内に固定し他方の主桁をシールドトンネルの一般セグメントに接続することにより、簡単な構造でシールド工事の発進部および到達部におけるシールドトンネル管路と立坑を接続することができる。
【図面の簡単な説明】
【図１】本発明にかかる継手をシールド工法によって構築されるシールドトンネルの一般セグメントどうしの接続に適用した実施態様における可撓継手の正面図である。
【図２】図１中Ａ−Ａ線による部分断面図である。
【図３】図中左半分は図１中Ａ−Ａ線による部分断面図、右半分は図１中Ｂ−Ｂ線による部分断面図である。
【図４】可撓止水部材の断面図である。
【図５】可撓止水部材押え板の断面図である。
【図６】吊り金具兼幅止め材の斜視図である。
【図７】本発明をシールド工事の発進部または到達部におけるシールドトンネル管路と立坑の接続に適用した実施態様における可撓継手の正面図である。
【図８】一般セグメントを取付けた状態における図７中Ｃ−Ｃ線による部分断面図である。
【図９】可撓止水部材の断面図である。
【図１０】可撓止水部材押え板の断面図である。
【図１１】一般セグメント取付け側の主桁に一般セグメントを取付けた状態を示す断面図である。
【図１２】一般セグメント取付け側の主桁に可撓止水部材押え板を取付けた状態を示す断面図である。
【図１３】継手の施工を完了した状態におけるＣ−Ｃ線による部分断面図である。
【図１４】従来の可撓継手を示す部分断面図である。
【符号の説明】
１、２０継手
２、２１、２２主桁
３、２４可撓止水部材押え板取付ボルト挿通孔
４一般セグメント取付けボルト用ネジ孔
５、３１可撓止水部材
６、３３可撓止水部材押え板
２６一般セグメント取付けボルト挿通孔
２８スキンプレート張出し部
３０止水板
４９立坑壁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible joint used for connecting a tunnel such as a shield tunnel, water and sewage, a common ditch, an underground passage, etc., and particularly suitable for use in connecting a shield tunnel pipeline and a shaft in a starting part and a reaching part of a shield work. The present invention relates to a flexible joint.
[0002]
[Prior art]
In general, in order to prevent undergrowth of the ground due to uneven settlement of the ground or expansion and contraction, opposing ends of a plurality of underdrains are connected by a joint having a structure capable of expansion and contraction. As such a joint, for example, there is a flexible joint for a shield tunnel whose partial sectional view is shown in FIG. This joint A is provided with a pair of ring-shaped main girders a and a, and these main girders a and a are formed by connecting an inner main girder a1 and an outer main girder a2 by a short cylindrical connecting member b. is there. The short cylindrical flexible waterproofing member c is fixed to the inner main girder a1 at both end walls by a vise-shaped pressing member d, and the outer main girder a2 is bolted to the end wall of the adjacent general segment e. ing. Here, f and g are joint materials such as sponge.
[0003]
[Problems to be solved by the invention]
As described above, the conventional flexible joint has a total of four main girder structures in which a pair of main girder is formed by connecting two inner girder and outer main girder with a connecting member. In places where the ground is unstable and relatively large uneven settlement is expected, the relative displacement between the two culverts connected by the flexible joint is large, and the width of the flexible joint is not sufficiently large. Therefore, it is necessary to make such a four-sheet main girder structure to support this load because a large load due to earth pressure is applied to the joint. It was.
[0004]
However, such a four-sheet main girder structure requires a large installation space. Therefore, not only is it necessary to increase the amount of excavation of tunnels, shafts, etc., but it is not economical, and the manufacturing cost of the flexible joint is also expensive. In addition, the installation of the flexible water-stopping member to the inner main girder and the installation of the outer main girder to the corresponding undercarriage must be carried out at the construction site, so it takes time for construction and the construction cost of the flexible joint However, there was a drawback of becoming expensive.
[0005]
The conventional flexible joint is used not only in places where the ground is unstable and relatively large uneven settlement is expected, but also in places where the ground is relatively stable and large uneven settlement is not expected. Has been. However, when the ground is relatively stable and the expected relative displacement between underdrains is relatively small, the load due to earth pressure on the flexible joint is also relatively small. It can be considered that there is no problem even if it is made smaller, and it is not always necessary to be constrained by the structure of the conventional main girder.
[0006]
The present invention has been made from such a viewpoint, and is a joint of a culvert that is suitable for use when a relative displacement due to uneven settlement between culverts that is expected is relatively small. It aims to provide a joint of a culvert that requires less installation space, is simple to construct, and can reduce manufacturing and construction costs.
[0007]
[Means for solving the problems]
The flexible joint of the present invention that achieves the above-described object of the present invention is arranged between a pair of ring-shaped main girders arranged at predetermined intervals in the axial direction and the pair of main girders. A short tubular flexible water-stopping member made of rubber, synthetic resin, etc., and a pair of ring-shaped flexible water-stopping member presser plates arranged between the inner peripheral end walls of the flexible water-stopping member; The pair of flexible water-stopping member pressing plates are fixed to the corresponding main girders by fixing members such as bolts, and the pair of main girders, the flexible water-stopping member, and the flexible water-stopping member The presser plate is assembled and fixed as a single body, and at least one of the main girders is fixed to the end of the corresponding undercarriage by a fixing member such as a bolt.
[0008]
In one aspect of the present invention, the undercarriage joint has a short cylindrical skin plate projecting portion projecting axially outward from one outer peripheral edge of the main girder, and projecting radially outward from the skin plate projecting portion. And a ring-shaped water stop plate fixed to the skin plate, the skin plate overhanging portion being fixed in a shield tunnel shaft wall, and the other of the main girders being fixed to a general segment of the shield tunnel. It is characterized by.
[0009]
[Action]
According to the present invention, each of the two main girders functions as a main girder for fixing the flexible water-stopping member presser plate and functions as a main girder for attaching the joint to the end of the corresponding undercarriage, that is, the conventional Since the function of both the inner main girder and the outer main girder of this joint is handled by one main girder, the conventional four main girder can be reduced to two main girder. Therefore, the installation space for the joint can be saved as compared with the conventional joint, and the manufacturing cost of the joint can be reduced. In addition, this structure makes it possible to assemble the entire joint integrally at the factory and bring it into the construction site. At the construction site, it is only necessary to fix the joint to the end of the corresponding underdrain with a bolt, etc. Construction is simplified and construction costs can be reduced.
[0010]
In one aspect of the present invention, the skin plate overhanging portion provided on one of the two main girders of the joint is fixed in the shaft wall, and the other main girder is connected to the general segment of the shield tunnel. Thus, it is possible to connect the shield tunnel pipeline and the vertical shaft at the start part and the arrival part of the shield work with a simple structure.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 6 show an embodiment in which the joint according to the present invention is applied to connection of general segments of a shield tunnel constructed by a shield method, FIG. 1 is a front view of a flexible joint, and FIG. 1 is a partial sectional view taken along the line AA in FIG. 3, the left half in FIG. 3 is a partial sectional view taken along the line AA in FIG. 1, the right half is a partial sectional view taken along the line BB in FIG. FIG. 5 is a cross-sectional view of a water retaining member holding plate, and FIG. 6 is a perspective view of a suspension metal fitting / width stopper material.
[0012]
The joint 1 includes a pair of ring-shaped main girders 2 and 2 arranged at predetermined intervals in the axial direction, and each main girder 2 has a predetermined number in the circumferential direction as is apparent from FIG. Flexible water-stopping member presser plate mounting bolt insertion holes 3 are formed in the axial direction at a pitch. As shown in FIG. 3, the flexible water-stopping member presser plate mounting bolt insertion hole 3 includes a counterbore portion 3 a and an insertion hole 3 b having a smaller diameter than the counterbore portion 3 a formed on the inner side in the axial direction. Further, the screw holes 4 for general segment mounting bolts are positioned in the middle of adjacent flexible water retaining member presser plate mounting bolt insertion holes 3 at a pitch that is an integral multiple of the flexible waterstop member presser plate mounting bolt insertion holes 3 in the circumferential direction. It is established as you do.
[0013]
The flexible waterproofing member 5 disposed between the main girders 2 and 2 is made of a short cylindrical member having flexibility and stretchability such as rubber and synthetic resin, and is formed with a small thickness at the axially central portion. Both end portions in the axial direction extend to the inner peripheral side to form end walls 5a. At the innermost peripheral end of the end wall 5a, an engagement protrusion 5b is formed integrally with the end wall 5a so as to be bent inward in the axial direction so as to engage with a presser plate engagement recess 6d described later. . The inner peripheral surface of the engaging protrusion 5b is designed to be positioned radially outward by a predetermined dimension from the position of the flexible water blocking member presser plate mounting bolt insertion hole 3 when the joint is assembled. A reinforcing cloth 15 is embedded on the inner peripheral side of the flexible water blocking member 5.
[0014]
The pair of ring-shaped flexible water-stopping member pressing plates 6 has a cross section shown in FIG. 5 and is formed by continuously forming members made of a plurality of arc-shaped steel materials in the circumferential direction. The flexible water stop member pressing plate 6 is designed to have a smaller diameter than the main beam 2 by a predetermined dimension. The flexible water-stopping member pressing plate 6 includes a main girder mounting portion 6a and a flexible water-stopping member locking portion 6b integrally formed on the outer peripheral side of the main girder mounting portion 6a. A value such that when the axially outer side surface of the member presser plate 6 is brought into contact with the inner side surface of the corresponding main girder 2, a predetermined interval corresponding to the allowable reduction displacement value of the joint is formed between the presser plates 6 Set to The flexible waterproofing member locking portion 6b of the presser plate 6 has an outer surface that is retracted inward in the axial direction from the outer surface of the main girder mounting portion 6a, and is provided on the inner surface of the end wall 5a of the flexible waterproofing member 5. It comprises an end wall contact portion 6c to be contacted, and an engagement recess 6d that is retracted further inward in the axial direction adjacent to the radially inner side thereof and engaged with the engagement protrusion 5b of the flexible water blocking member 5.
[0015]
As shown in FIG. 3, the flexible water stop member presser plate 6 is provided with a flexible water stop member presser plate mounting bolt at a position corresponding to each flexible water stop member presser plate mounting bolt insertion hole 3 of the main girder 2. A screw hole 7 is opened.
[0016]
The flexible water stop member presser plate 6 is accommodated by a presser plate mounting bolt 8 inserted into the flexible water stop member presser plate mounting bolt insertion hole 3 and screwed into the screw hole 7 for the flexible water stop member presser plate mounting bolt. The main girder 2 is fixed. In addition, the flexible water blocking member 5 is pressed and fixed to the main girders 2 and 2 by the flexible water blocking member pressing plates 6 and 6. The bolt head of the presser plate mounting bolt 8 is accommodated in the counterbore 3 a so as not to interfere with the end wall 9 a of the general segment 9.
[0017]
A joint material 10 made of foamed urethane or the like is interposed between the flexible water-stopping member pressing plates 6 and 6. A cover plate 11 made of a thin steel plate is disposed so as to straddle the main girders 2 and 2, and one end thereof is welded to the outer peripheral surface of the corresponding main girder 2.
[0018]
Bolt insertion holes 9b are formed in the end walls 9a of the general segments 9 corresponding to the main girders 2 at positions corresponding to the screw holes 4 for the general segment mounting bolts of the main girders 2, and the main girders 2 are bolt insertion holes. The general segment fixing bolt 10 screwed into the general segment mounting bolt screw hole 4 from 9b is fixed to the general segment 9.
[0019]
At the two top portions of the main girders 2 and 2, steel hanging brackets and width stoppers 12 as shown in FIG. 6 are provided at two locations in the circumferential direction. The suspension fitting and width stopper 12 is welded and fixed to the inner surfaces of the suspension fitting fixing members 13 and 13 welded to the main girders 2 and 2 at both ends, and a rope hole 12a is formed at the center. In addition, under the main girders 2 and 2, width stoppers 14 having the same configuration as the hanging metal fittings and width stoppers 12 are provided at 2 to 4 locations in the circumferential direction.
[0020]
Next, the construction method of this joint 1 is demonstrated.
In a factory, a pair of main girders 2 and 2 are arranged at a predetermined interval, and the hanging bracket / width stopper 12 and the width stopper 14 are welded and fixed at predetermined positions. Next, the flexible water stop member 5 is disposed between the pair of main girders 2 and 2, and the flexible water stop member presser plates 6 and 6 are connected to the end wall contact portion 6c of the flexible water stop member locking portion 6b. Is brought into contact with the end wall 5a of the flexible water-stopping member 5, and the engaging protrusion 5b of the flexible water-stopping member 5 is engaged with the engaging recess 6d on the inner peripheral side of the flexible water-stopping member. The flexible water-stopping member pressing plates 6 and 6 are fixed to the main girders 2 and 2 by pressing plate mounting bolts 8.
[0021]
The joint 1 assembled in the factory in this way is transported to the shield tunnel construction site, the rope is connected to the hanging bracket / width stopper 12 and the joint is suspended in the shaft, and is carried into the junction with the shield tunnel. Next, the main beam 2 is attached and fixed to the end wall 9a of the corresponding general segment 9 by the general segment mounting bolt 10. Next, the suspension metal fitting / width stopper material 12 and the width stopper material 14 are cut by gas cutting at a position indicated by a broken line in FIG.
[0022]
Next, the operation of the joint 1 will be described.
In a normal state where the segments 9 and 9 are not displaced, the flexible water-stopping member 5 is supported by the presser plates 6 and 6, and the pressure applied to the flexible water-stopping member 5 from the outer peripheral side is controlled by the presser plates 6 and 6. The tensile stress generated in the water-stopping member 5 is uniformly supported and minimized. When the segments 9 and 9 are relatively displaced in the direction in which the distance between the segments 9 and 9 increases, the central portion of the flexible water-stopping member 5 extends to allow the joint 1 to be extended and displaced. On the other hand, when the segments 9 and 9 are relatively displaced in the direction in which the interval between them is narrowed, the joint material 10 is compressed and the compression displacement of the joint 1 is allowed. Even when any of the segments 9 and 9 sinks unequally, the flexible water-stopping member 5 is shear-displaced following the shear displacement of the flexible water-stopping member presser plate 6.
[0023]
Next, another embodiment of the present invention will be described.
7 to 13 show an embodiment in which the present invention is applied to the connection between a shield tunnel pipeline and a shaft at the start or reach of shield work. FIG. 7 is a front view of a flexible joint, and FIG. 7 is a partial cross-sectional view taken along the line CC in FIG. 7 with the segment attached, FIG. 9 is a cross-sectional view of the flexible water-stopping member, FIG. 10 is a cross-sectional view of the flexible water-stopping member pressing plate, and FIG. 12 is a cross-sectional view showing a state where a general segment is attached to the main girder on the side, FIG. 12 is a cross-sectional view showing a state where a flexible water-stopping member pressing plate is attached to the main girder on the general segment attachment side, and FIG. It is a fragmentary sectional view by the CC line in the completed state.
[0024]
As shown in FIG. 8, the joint 20 includes a pair of ring-shaped main girders 21 and 22 arranged at predetermined intervals in the axial direction. The main girder 21 is a main girder on the shaft wall mounting side, and the main girder 22 is a main girder on the general segment mounting side. As shown in FIG. 7, in the shaft wall mounting side main beam 21, flexible water stop member presser plate mounting bolt insertion holes 24 are opened in the axial direction at a predetermined pitch in the circumferential direction. Further, two general segment mounting bolt insertion holes 23 are arranged in the middle of the flexible water blocking member presser plate mounting bolt insertion holes 24 adjacent to each other at a pitch twice that of the flexible waterstop member presser plate mounting bolt insertion holes 24 in the circumferential direction. It has been established to enter one by one. The main girder 22 on the general segment mounting side is provided with a flexible water-stopping member presser plate mounting bolt screw hole 25 and a general segment mounting bolt insertion hole 26 (a countersunk bolt insertion hole in FIG. 11) in the same arrangement. In this embodiment, since the general segment is not fixed to the main beam 21, the general segment mounting bolt insertion hole 23 is not processed.
[0025]
A steel short cylindrical skin plate 27 is disposed so as to straddle the main girders 21 and 22, and is welded to the outer peripheral surfaces of the main girders 21 and 22. The center portion of the skin plate 27 is cut off in the circumferential direction so as to allow expansion and contraction displacement of the joint 20 to form an opening 27a. Further, a short cylindrical skin plate projecting portion 28 is formed so as to project from the outer peripheral edge of the shaft wall mounting side main beam 21 integrally with the skin plate 27 in an axial direction.
[0026]
A reinforcing rib 29 is welded to the inner peripheral surface of the skin plate overhanging portion 28 at an intermediate position of the flexible water blocking member presser plate mounting bolt insertion hole 24 adjacent to the vertical wall mounting side main beam 21.
[0027]
A ring-shaped steel water stop plate 30 extending in the axial direction is welded to the outer peripheral surface of the skin plate projecting portion 28 so as to project outward in the radial direction.
[0028]
The flexible water stop member 31 disposed between the main girders 21 and 22 is made of a short cylindrical member having flexibility and stretchability such as rubber and synthetic resin, and bulges toward the inner peripheral side in the central portion in the axial direction. The bulging portion 31c is formed, flat portions 31d are formed on both sides thereof, and both end portions in the axial direction extend to the inner peripheral side to form end walls 31a. An engagement recess 31b (FIG. 9) for engaging with a presser plate engagement protrusion described later is formed inside the outer peripheral end of the end wall 31a. The inner peripheral surface of the end wall 31a is designed to be positioned radially outward from the positions of the flexible water-stopping member presser plate mounting bolt insertion hole 23 and the mounting bolt screw hole 25 when the joint is assembled. A reinforcing cloth 32 (FIG. 9) is embedded in the flexible water blocking member 31.
[0029]
The pair of ring-shaped flexible water-stopping member pressing plates 33 has a cross section shown in FIG. 10 and is formed by joining members made of a plurality of arc-shaped steel materials in the circumferential direction. The flexible water stop member pressing plate 33 is designed to have a smaller diameter than the main girders 21 and 22 by a predetermined dimension. The flexible water-stopping member pressing plate 33 includes a main girder mounting portion 34 and a ring-shaped flexible water-stopping member supporting and locking portion 35 fixed to the outer peripheral side thereof. An end on the inner peripheral side of the main girder mounting portion 34 of the pressing plate 33 protrudes by a predetermined length outward in the axial direction to form a positioning protrusion 34a. The flexible waterstop member support locking portion 35 of the presser plate 33 has a shape that matches the inner peripheral surface of the flat portion 31d of the flexible waterstop member 31, and a support portion 35a that contacts the inner peripheral surface of the flat portion 31d. And an engaging projection 35b that protrudes outward in the axial direction from the outer surface of the main girder mounting portion 34 on the outer side in the axial direction and engages with the engaging recess 31b of the flexible water blocking member 31.
[0030]
As shown in FIG. 10, the flexible water stop member presser plate 33 has positions corresponding to the flexible water stop member presser plate mounting bolt insertion holes 23 of the main girder 21 and the mounting bolt screw holes 25 of the main girder 22. A flexible water-stopping member presser plate mounting bolt insertion hole 36 is opened.
[0031]
The flexible water stop member presser plate 33 fixed to the shaft wall mounting side main girder 21 is inserted into the flexible water stop member presser plate mounting bolt insertion hole 23 of the main girder 21 and the mounting bolt insertion hole 36 of the presser plate 33. The presser plate mounting bolt 37 is fixed to the main girder 21 by tightening a nut 38. Further, the flexible water retaining member pressing plate 33 fixed to the general segment mounting side main girder 22 is inserted into the mounting bolt insertion hole 36 of the flexible water blocking member pressing plate 33 and into the mounting bolt screw hole 25 of the main girder 22. It is fixed to the main girder 22 by screwed bolts 39 for attaching a presser plate. In addition, the flexible water stop member 31 is pressed and fixed to the main girders 21 and 22 by the flexible water stop member pressing plates 33 and 33.
[0032]
A joint material 40 made of urethane foam or the like is interposed between the flexible waterproofing member pressing plates 33, 33, and the same joint material 41, between the inner girders 21 and 22 on the inner peripheral side and the outer peripheral side thereof, 48 is interposed. A cover plate 42 made of a thin steel plate is disposed so as to cover the opening 27 a of the skin plate 27, and one end thereof is welded to the outer peripheral surface of the skin plate 27.
[0033]
A bolt insertion hole 43 b is formed in the end wall 43 a of the general segment 43 corresponding to the general segment connection side main girder 22 at a position corresponding to the general segment mounting bolt insertion hole 26 of the main girder 22. The bolt insertion hole 26 of the main girder 22 is formed in a shape that matches the shape of the countersunk bolt, and the main girder 22 is inserted into the bolt insertion hole 43b of the general segment from the bolt insertion hole 26. The nut 45 is fastened to the general segment 43 by tightening the nut 45.
[0034]
At the tops of the main girders 21 and 22, steel hanging brackets and width stoppers 46 are provided at two locations in the circumferential direction. Both ends of the hanging metal fitting / width stopper 46 are fixed to the main girders 21 and 22 by welding (the cover plate 42 is partially cut away), and two rope holes 46a are formed at the center. Has been. Further, under the main girders 21 and 22, width stoppers 47 having the same configuration as the suspension metal fittings and width stoppers 46 are provided at two locations in the circumferential direction.
[0035]
Next, the construction method of this joint 1 is demonstrated.
In the factory, a flexible water stop member 31 is arranged between a pair of main girders 21 and 22 to which a skin plate 27, a skin plate overhanging portion 28, a water stop plate 30, and a rib 29 are attached. The plates 33, 33 are brought into contact with the flat portions 31 d of the flexible water-stopping member 31 with the support portions 35 a of the flexible water-stopping member support locking portions 35, and the engaging projections 35 b are engaged with the flexible water-stopping member 31. It is arranged on the inner peripheral side of the flexible water stop member 31 so as to be engaged with the mating recess 31b, and the flexible water stop member presser plates 33, 33 are fixed to the main girders 21, 22 by presser plate mounting bolts 37, 39. To do. Next, the suspension metal fitting / width stopper material 46 and the width stopper material 47 are fixed to the main girders 21 and 22 by welding. The joint 20 thus assembled at the factory is transported to the shield tunnel construction site.
[0036]
At the construction site, after digging a hole in the shaft, a rope is connected to the hanging metal fitting / width stopper 46 and the joint 20 is suspended in the hole, and then the main girder 22 is attached to the end wall 43a of the corresponding general segment 43 on the general segment 43a. The mounting bolts and nuts 44 and 45 are used for fixing. Next, by forming a shaft form and constructing a shaft wall 49 by placing ready-mixed concrete, the skin plate overhanging portion 28 and the water stop plate 30 are embedded in the shaft wall 49 as shown in FIG. Water from entering the tunnel from 49 is prevented. Thereafter, the suspension metal fitting / width stopper material 46 and the width stopper material 47 are gas-cut at the central portion as shown in FIG.
[0037]
Since the operation of the flexible joint 20 is the same as the operation of the joint 1, the description thereof is omitted. Each of the above embodiments is a case where the present invention is applied when a culvert is constructed by a shield method, but the present invention is not limited to the shield method, but is also applied to a culvert joint constructed by other methods such as a propulsion method. It is possible.
[0038]
【The invention's effect】
As described above, according to the present invention, each of the two main girders has a function as a main girder for fixing the flexible water-stopping member presser plate and a main for attaching the joint to the corresponding end of the underdrain. Since the function as a girder, that is, the function of both the inner main girder and the outer main girder of the conventional joint is handled by one main girder, the conventional four main girder can be reduced to two main girder. Therefore, the installation space for the joint can be saved as compared with the conventional joint, and the manufacturing cost of the joint can be reduced. In addition, this structure makes it possible to assemble the entire joint integrally at the factory and bring it into the construction site. At the construction site, it is only necessary to fix the joint to the end of the corresponding underdrain with a bolt, etc. Construction is simplified and construction costs can be reduced.
[0039]
In one aspect of the present invention, the skin plate overhanging portion provided on one of the two main girders of the joint is fixed in the shaft wall, and the other main girder is connected to the general segment of the shield tunnel. Thus, it is possible to connect the shield tunnel pipeline and the vertical shaft at the start part and the arrival part of the shield work with a simple structure.
[Brief description of the drawings]
FIG. 1 is a front view of a flexible joint in an embodiment in which a joint according to the present invention is applied to connection of general segments of a shield tunnel constructed by a shield method.
FIG. 2 is a partial cross-sectional view taken along line AA in FIG.
3 is a partial cross-sectional view taken along line AA in FIG. 1, and the right half is a partial cross-sectional view taken along line BB in FIG.
FIG. 4 is a cross-sectional view of a flexible water blocking member.
FIG. 5 is a cross-sectional view of a flexible waterproofing member pressing plate.
FIG. 6 is a perspective view of a hanging bracket / width stopper.
FIG. 7 is a front view of a flexible joint in an embodiment in which the present invention is applied to a connection between a shield tunnel pipeline and a shaft at a start part or an arrival part of shield work.
8 is a partial cross-sectional view taken along line CC in FIG. 7 with a general segment attached.
FIG. 9 is a cross-sectional view of a flexible water blocking member.
FIG. 10 is a cross-sectional view of a flexible waterproofing member pressing plate.
FIG. 11 is a cross-sectional view showing a state in which a general segment is attached to a main girder on a general segment attachment side.
FIG. 12 is a cross-sectional view showing a state in which a flexible water-stopping member presser plate is attached to a main girder on the general segment attachment side.
FIG. 13 is a partial cross-sectional view taken along the line CC in a state where construction of the joint is completed.
FIG. 14 is a partial cross-sectional view showing a conventional flexible joint.
[Explanation of symbols]
1, 20 Joint 2, 21, 22 Main girder 3, 24 Flexible water retaining member retainer plate mounting bolt insertion hole 4 General segment mounting bolt screw hole 5, 31 Flexible water retaining member 6, 33 Flexible water retaining member presser Plate 26 General segment mounting bolt insertion hole 28 Skin plate overhanging portion 30 Water blocking plate 49 Vertical wall

Claims

A pair of ring-shaped main girders arranged at predetermined intervals in the axial direction, and a short cylindrical flexible water-stop member made of rubber, synthetic resin, etc. arranged between the pair of main girders And a pair of ring-shaped flexible water-stopping member press plates disposed between the inner peripheral side end walls of the flexible water-stopping member, the pair of flexible water-stopping member press plates being bolts Are fixed to corresponding main girders by fixing members such as a short cylindrical skin plate overhanging portion projecting axially outward from one outer peripheral edge of the main girders, and radially outward from the skin plate overhanging portion. A ring-shaped water stop plate fixed to the skin plate in an overhanging manner, the skin plate overhanging portion being fixed in a shield tunnel shaft wall, and the other of the main girders being a general segment of the shield tunnel Underground joint characterized by being fixed.