JP3474150B2 - Flexible joint for thin segments - Google Patents

Description

【発明の詳細な説明】 【０００１】 【発明の属する技術分野】本発明は、上下水道等の暗渠
の接続に用いる可撓継手に関し、特にシールド工法によ
って構築される管路のシールドセグメントを接続する可
撓継手に関する。 【０００２】 【従来の技術】従来上下水道等をシールドトンネルによ
って構築する工法が盛んに行われており、このようなシ
ールドトンネルの二次覆工は一般に現場打ちのコンクリ
ートを使用して巻き立てられている。シールドセグメン
トを接続する可撓継手は、セグメントの主桁の高さと二
次覆工高さの合計の高さを考慮してこの合計高さ内に収
まるような寸法に設計されている。 【０００３】 【発明が解決しようとする課題】最近市町村等における
下水道等の工事において、内径１ｍ程度の小口径のシー
ルドトンネルを使用することが増えているが、シールド
工法によりこのような小口径のセグメントを構築する場
合は、トンネル内に充分な容積を確保するためセグメン
トの主桁の高さを低くしなければならない。すなわち、
従来標準シールドの場合主桁の高さは１００ｍｍ〜１５
０ｍｍ程度であるが、内径１ｍ程度の小口径のシールド
トンネルの場合は主桁の高さは５０ｍｍ〜７５ｍｍ程度
に押えなければならない。また、このような小口径のシ
ールドトンネルにおいてはコンクリート打設による二次
覆工を施工しない。したがって、このようにセグメント
の主桁を薄くし、かつ二次覆工を省略すると、セグメン
ト間の可撓継手を構築する場合、従来の可撓継手では、
施工時に推力受材がセグメントの内周面から内周側に突
出して工事の妨げとなる。 【０００４】また、シールド工法においては、可撓継手
を施行する場合、接続される両セグメント間に推力受材
を差し渡して推力を伝達する必要があるが、上記のよう
な小口径のシールドトンネルにおいては、主桁の高さが
低いので、主桁の高さの範囲内で推力受材を設置するこ
とが困難である。したがって、このような小口径のシー
ルドトンネルを施行する場合は、図９の部分断面図に示
すように、セグメントａ、ａ’を接続する可撓継手ｂの
主桁ｃ、ｃ’の内周面に複数の推力受材ｄを周方向に所
定間隔で取付け、一方のセグメントから他方のセグメン
トに推力を伝達するようにしていた。しかし、トンネル
施行時においてトンネル内は作業者が機材を運搬する通
路でもあるため、内径１ｍ程度の小口径のトンネル内部
にこのように推力受材が突出して取付けられた場合、こ
れらの推力受材は通行の邪魔となり、トンネル内の工事
を著しく妨げていた。 【０００５】本発明は、このような小口径のシールドト
ンネルにおいて可撓継手を設置する場合の問題点にかん
がみなされたものであって、このような小口径の薄型セ
グメントに適用しても可撓継手がセグメントの内周面か
ら内周側に突出することがなく平滑な内面の管路を形成
することができ、またトンネルの施行に際し、推力受材
が管路内に突出して通行や工事の妨げとなることがない
薄型セグメント用可撓継手を提供しようとするものであ
る。 【０００６】 【課題を解決する手段】上記本発明の目的を達成する薄
型セグメント用可撓継手は、シールド工法によって構築
される管路のシールドセグメントを接続する継手であっ
て、接続される２つのセグメントの対向する端部間に配
置され、環状の板状部材からなり、取付ボルト用ボルト
孔が形成された固定部が周方向に所定間隔で形成される
とともに該固定部の間には内周側に推力受材挿入用切欠
き部が形成された１対の可撓止水部材取付桁と、該可撓
止水部材取付桁の軸方向内側に配置され、環状の板状部
材からなり、取付ボルト用ボルト孔が形成された固定部
が周方向に所定間隔で形成されるとともに該固定部の間
には内周側に推力受材挿入用切欠き部が形成された１対
の可撓止水部材押え板と、ゴム・合成樹脂等からなる短
筒状の部材であって、軸方向両端部には半径方向に延長
する固定部が形成された可撓止水部材とを備え、該可撓
止水部材取付桁と該可撓止水部材押え板の各内周面が該
セグメントに施工されるモルタルの内周面と同一平面に
なるようにして、かつ該可撓止水部材押え板の該取付ボ
ルト用ボルト孔と該可撓止水部材取付桁の該取付ボルト
用ボルト孔とが整合するようにして該可撓止水部材取付
桁と該可撓止水部材押え板を配置するとともに、該可撓
止水部材の固定部の内周側端面が該可撓止水部材取付桁
の取付ボルト用ボルト孔および該可撓止水部材押え板の
取付ボルト用ボルト孔よりも外周側に位置するようにし
て該可撓止水部材を該可撓止水部材取付桁と該可撓止水
部材押え板の間に介装し、該各取付ボルト用ボルト孔に
配設された取付ボルトにより該可撓止水部材を該可撓止
水部材取付桁に対し固定したことを特徴とするものであ
る。 【０００７】 【作用】本発明によれば、可撓止水部材取付桁と可撓止
水部材押え板の各内周面がセグメントに施工されるモル
タルの内周面と同一平面になるようにして可撓止水部材
取付桁と可撓止水部材押え板を配置するとともに、可撓
止水部材の固定部の内周側端面が可撓止水部材取付桁の
取付ボルト用ボルト孔および可撓止水部材押え板の取付
ボルト用ボルト孔よりも外周側に位置するようにして可
撓止水部材を該可撓止水部材取付桁と可撓止水部材押え
板の間に介装し、各取付ボルト用ボルト孔に配設された
取付ボルトにより可撓止水部材を可撓止水部材取付桁に
対し固定するように構成したので、可撓継手を構成する
可撓止水部材取付桁、可撓止水部材押え板および可撓止
水部材のいずれも接続される２つのセグメントの内周面
から管路内に突出することがなく、可撓継手部において
セグメントと同一平面が形成されるので、管路全体とし
て平滑な内面を確保することができる。 【０００８】また、可撓止水部材取付桁および可撓止水
部材押え板にはそれぞれ推力受材挿入用切欠き部が形成
されているので、推力受材をこれらの切欠き部を介して
設置することにより、トンネルの施行に際し、推力受材
が管路内に突出することを防止しながら接続される２つ
のセグメント間に推力を伝達することができる。 【０００９】 【発明の実施の形態】以下添付図面を参照して本発明の
実施の形態について説明する。 【００１０】図１および図２は本発明の可撓継手の１実
施形態を示す部分断面図であって、図１は固定部の部分
断面図、図２は推力受材挿入部の部分断面図である。 【００１１】継手１は、必須の構成部分として可撓止水
部材取付桁３、３’と、可撓止水部材押え板４、４’
と、可撓止水部材５を備えている。なお、図中左右１対
の構成部分は同一数字を用い、図中右側のものに「’」
記号を付して表し、以下の説明においては、場合により
図中左側の構成部分についてのみ説明することとする。 【００１２】１対の可撓止水部材取付桁３、３’は環状
の板状部材からなり、接続される２つのスチールセグメ
ント２、２’の対向する端部２ａ、２ａ’間に配置され
る。可撓止水部材取付桁３はその外周端部に溶接された
短筒状の接続板６を介して環状の外桁７の外周端部に取
付けられており、外桁７はセグメント端部２ａにボルト
ナット９により固定されている。接続板６は可撓止水部
材取付桁３との接合部から継手軸方向内側に張出して、
後述の可撓止水部材５を外部から侵入する土砂から保護
する保護カバー１０を構成している。なお、１８は一端
部が接続板６または６’に溶接されたカバー板である。 【００１３】可撓止水部材取付桁３は、図３の正面図に
示すように、環状の部材を周方向に複数の部材に分割し
た部材３ａからなり、複数の取付ボルト用ボルト孔３ｃ
が形成された可撓止水部材固定用の固定部３ｂが周方向
に所定間隔で形成されるとともに、各固定部３ｂの間に
は取付ボルト用取付孔３ｃの継手半径方向外側の端部と
同一の円周上の位置から内周側に推力受材挿入用切欠き
部３ｄが形成されている。切欠き部３ｄの深さは推力受
材の高さより大きく設計されている。可撓止水部材取付
桁３の各分割部材３ａは周方向両端部に継手軸方向外側
に張出す接続板３ｅ（図１参照）が固定されており、周
方向に隣接する可撓止水部材取付桁分割部材３ａの接続
板３ｅどうしをボルト１１により固定することにより環
状の可撓止水部材取付桁３を形成する。 【００１４】可撓止水部材押え板４は可撓止水部材取付
桁３の軸方向内側に配置され、図４の正面図に示すよう
に、環状の部材を周方向に複数の部材に分割した部材４
ａからなり、複数の取付ボルト用ボルト孔４ｃが形成さ
れた可撓止水部材固定用の固定部４ｂが周方向に所定間
隔で形成されるとともに、各固定部４ｂの間には取付ボ
ルト用取付孔４ｃの継手半径方向外側の端部と同一の円
周上の位置から内周側に推力受材挿入用切欠き部４ｄが
形成されている。切欠き部４ｄの深さは推力受材の高さ
より大きく設計されている。各固定部４ｂおよび各推力
受材挿入用切欠き部４ｄの寸法および形状は可撓止水部
材取付桁３の固定部３ｂおよび推力受材挿入用切欠き部
３ｄの寸法及び形状とほぼ合致するように形成されてい
る。各可撓止水部材押え板の外周側端部には、図６の固
定部拡大断面図に示すように、軸方向外側に僅かに突出
する可撓止水部材係合部４ｆと軸方向内側に向けて張出
す可撓止水部材支持部４ｇを備える頂板４ｅが固定され
ている。また固定部４ｂの内周側端部には軸方向外側に
丸棒からなる取付用ボルト締付け用ライナー１２が溶接
固定されている。可撓止水部材押え板４の各分割部材４
ａの両端部には接続板は設けられておらず、複数の可撓
止水部材押え板分割部材４ａを周方向に隙間なく配置す
ることにより環状の可撓止水部材押え板４を形成する。 【００１５】可撓止水部材５は、ゴム・合成樹脂等の可
撓部材からなる短筒状の部材であって、軸方向中央部に
は内周側に膨出する膨出部５ａを有し、軸方向両端部に
は半径方向に延長する固定部５ｂが形成されている。膨
出部５ａの内周面は固定部の内周面よりも内周側に突出
しないように設計されている。固定部５ｂは、図５の可
撓止水部材拡大断面図に示すように、軸方向外側に止水
リップ５ｃが形成され、また軸方向内側の外周端部には
軸方向外側に凹む環状の凹部５ｄが形成されており、可
撓止水部材５を取付ける際に可撓止水部材押え板４の可
撓止水部材係合部４ｆがこの凹部５ｄ内に係合すること
により可撓止水部材５の固定をより確実にするように構
成されている。また、図示の例において可撓止水部材５
には補強布１３が埋設されている。図５において、可撓
止水部材５にはボルト孔が全く形成されておらず、可撓
止水部材５の内周面から外周面までの高さＨ１は、可撓
継手施工完了後の状態において、可撓止水部材取付桁３
の取付ボルト用取付孔３ｃの継手半径方向外側の端部か
ら保護カバー１０の内周面までの高さＨ２（図３）を超
えないように設計されている。 【００１６】可撓止水部材取付桁３と可撓止水部材押え
板４は、その各内周面がセグメント２、２’に施工され
るモルタルの仕上った内周面と同一平面になるようにし
て、かつ可撓止水部材押え板４の取付ボルト用ボルト孔
４ｃと可撓止水部材取付桁の取付ボルト用ボルト孔３ｃ
とが整合するようにして配置されている。また、可撓止
水部材５は、その固定部５ｂの内周側端面５ｅが可撓止
水部材取付桁３の取付ボルト用ボルト孔３ｃおよび可撓
止水部材押え板４の取付ボルト用ボルト孔４ｃよりも外
周側に位置するようにして可撓止水部材取付桁３と可撓
止水部材押え板４の間に介装されており、各取付ボルト
用ボルト孔３ｃ、４ｃに挿入された取付ボルト１４とこ
れに螺合するナット１５を緊締することにより可撓止水
部材５は可撓止水部材押え板４を介して可撓止水部材取
付桁３に対し圧着され固定されている。 【００１７】可撓止水部材取付桁３の各推力受材挿入用
切欠き部３ｄから外周側の可撓止水部材取付桁３の部分
と外桁７の間には図３および図８に示すように推力受材
取付板１６が配置され、この取付板１６の両端部は可撓
止水部材取付桁３の軸方向外側面および外桁７の軸方向
内側面に溶接固定されている。可撓継手施工完了後の状
態を示す図２において、推力受材取付板１６には推力受
材挿入用切欠き部３ｄからモルタルが流出することを防
止するための切欠き部３ｄの形状に合致する形状のカバ
ー部材１７がボルト止めされている。 【００１８】この可撓継手１を施工するには、図７の部
分断面図に示すように、可撓止水部材５を取付用ボルト
１４およびナット１５により可撓止水部材押え板４を介
して可撓止水部材取付桁３に取付けた後図７、図８に示
すように可撓止水部材押え板３の推力受材挿入用切欠き
部４ｄおよび可撓止水部材取付桁３の推力受材挿入用切
欠き部３ｄに板状の推力受材１９を挿入し、その両端部
１９ａ、19a’を推力受材取付板１６、１６’にボルト
止めする。推力受材１９を介してセグメント２、2’間
に推力を伝達した後推力受材１９を取外し、推力受材取
付板１６の推力受材取付用ボルト孔を利用してカバー部
材１７をボルト止めする。次にモルタル２０をセグメン
ト２、２’および継手１の可撓止水部材取付桁３と外桁
７の間の空間に充填してセグメント２、２’および継手
１を通じて平滑な内周面を形成し継手１の施工を完了す
る。 【００１９】推力受材は図７に示す推力受材１９に限る
ものではない。推力受材の変更例を図１０の平面図に示
す。図７の推力受材１９は推力をボルト２４のせん断強
度で受けることになり、セグメントに作用する推力が比
較的に小さい場合は、図７の推力受材１９で充分である
が、推力が大きい場合は、ボルト２４に過大な推力が作
用することによりボルト２４が破壊するおそれがある。
そこで推力が大きい場合は、図１０（ａ）の平面図に示
すような両端部にテーパを設けた推力受材２２を用意す
る一方、図１０（ｂ）の平面図に示すような推力受材２
２のテーパに合致するテーパが設けられた１対のライナ
ー２３、２３’を予め工場において外桁２３、２３’を
溶接しておき、施工現場において図１０（ｃ）に示すよ
うに推力受材２２をライナー２３、２３’の間に嵌め込
むようにして推力受材を取付けることにより、大きな推
力に対処することができる。推力受材２２を取付けた状
態の図７と同様の継手の断面図を図１１に示す。 【００２０】地震等による地盤変動によりセグメント
２、２’間に伸縮変位またはせん断変位が生じた場合
は、可撓止水部材５が変形することによりこれらの変位
を吸収することができる。 【００２１】 【発明の効果】以上述べたように、本発明によれば、可
撓止水部材取付桁と可撓止水部材押え板の各内周面がセ
グメントに施工されるモルタルの内周面と同一平面にな
るようにして可撓止水部材取付桁と可撓止水部材押え板
を配置するとともに、可撓止水部材の固定部の内周側端
面が可撓止水部材取付桁の取付ボルト用ボルト孔および
可撓止水部材押え板の取付ボルト用ボルト孔よりも外周
側に位置するようにして可撓止水部材を該可撓止水部材
取付桁と可撓止水部材押え板の間に介装し、各取付ボル
ト用ボルト孔に配設された取付ボルトにより可撓止水部
材を可撓止水部材取付桁に対し固定するように構成した
ので、可撓継手を構成する可撓止水部材取付桁、可撓止
水部材押え板および可撓止水部材のいずれも接続される
２つのセグメントの内周面から管路内に突出することが
なく、可撓継手部においてセグメントと同一平面が形成
されるので、管路全体として平滑な内面を確保すること
ができる。 【００２２】また、可撓止水部材取付桁および可撓止水
部材押え板にはそれぞれ推力受材挿入用切欠き部が形成
されているので、推力受材をこれらの切欠き部を介して
設置することにより、トンネルの施行に際し、推力受材
が管路内に突出することを防止しながら接続される２つ
のセグメント間に推力を伝達することができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible joint used for connection of a culvert such as water supply and sewerage, and more particularly to connecting a shield segment of a pipeline constructed by a shield method. The present invention relates to a flexible joint. 2. Description of the Related Art Conventionally, construction methods for constructing a water supply and sewage system using a shield tunnel have been actively performed, and the secondary lining of such a shield tunnel is generally wound up using cast-in-place concrete. ing. The flexible joint connecting the shield segments is designed to fit within the total height in consideration of the total height of the main girder of the segment and the secondary lining height. [0003] Recently, in the construction of sewage systems in municipalities and the like, the use of shield tunnels having a small diameter of about 1 m has been increasing. When building a segment, the height of the main girder of the segment must be reduced to ensure sufficient volume in the tunnel. That is,
In the case of the conventional standard shield, the height of the main girder is 100mm ~ 15
Although it is about 0 mm, in the case of a small-diameter shield tunnel having an inner diameter of about 1 m, the height of the main girder must be suppressed to about 50 mm to 75 mm. In such a small-diameter shield tunnel, secondary lining by casting concrete is not performed. Therefore, when the main girder of the segment is thinned and the secondary lining is omitted, when a flexible joint between the segments is constructed, in the conventional flexible joint,
At the time of construction, the thrust receiving member protrudes from the inner peripheral surface of the segment toward the inner peripheral side, thereby hindering the construction. Further, in the shield method, when a flexible joint is applied, it is necessary to transmit a thrust by inserting a thrust receiving material between both segments to be connected. However, since the height of the main girder is low, it is difficult to install the thrust receiving member within the height of the main girder. Therefore, when such a small-diameter shield tunnel is implemented, as shown in the partial sectional view of FIG. 9, the inner peripheral surface of the main girders c and c 'of the flexible joint b connecting the segments a and a'. A plurality of thrust receiving members d are attached at predetermined intervals in the circumferential direction to transmit thrust from one segment to the other segment. However, at the time of tunnel construction, since the inside of the tunnel is also a path for workers to transport equipment, if such a thrust receiving material is protruded and mounted inside a small-diameter tunnel with an inner diameter of about 1 m, Hampered traffic and severely hindered construction in the tunnel. The present invention has been made in view of the problem of installing a flexible joint in such a small-diameter shield tunnel, and is applicable to such a small-diameter thin segment. The joint does not protrude from the inner circumferential surface of the segment to the inner circumferential side, and a smooth inner pipe can be formed.In addition, at the time of tunnel construction, thrust receiving material protrudes into the pipe and traffic and construction An object of the present invention is to provide a flexible joint for a thin segment that does not interfere. A flexible joint for a thin segment which achieves the object of the present invention is a joint for connecting shield segments of a pipeline constructed by a shield method, and comprises two joints to be connected. A fixed portion, which is disposed between the opposite ends of the segment and is formed of an annular plate-like member and has bolt holes for mounting bolts, is formed at predetermined intervals in a circumferential direction, and has an inner periphery between the fixed portions. A pair of flexible water-stopping member mounting girder having a thrust receiving material insertion notch formed on the side thereof, and an annular plate-shaped member disposed axially inside the flexible water-stopping member mounting girder; A pair of flexible portions having fixed portions formed with bolt holes for mounting bolts formed at predetermined intervals in a circumferential direction, and a cutout portion for inserting a thrust receiving material formed on an inner circumferential side between the fixed portions. Water-stopping member holding plate and short cylindrical shape made of rubber, synthetic resin, etc. A flexible water-stopping member having fixed portions extending in the radial direction formed at both ends in the axial direction, wherein the flexible water-stopping member mounting girder and the flexible water-stopping member pressing plate are provided. Each inner peripheral surface is flush with the inner peripheral surface of the mortar applied to the segment, and the bolt holes for the mounting bolts of the flexible water-stopping member holding plate and the flexible water-stopping member mounting beam The flexible water-stopping member mounting girder and the flexible water-stopping member holding plate are arranged so that the bolt holes for the mounting bolts are aligned with each other, and the inner peripheral end surface of the fixing portion of the flexible water-stopping member Is positioned on the outer peripheral side with respect to the mounting bolt bolt holes of the flexible water-stopping member mounting girder and the mounting bolt bolt holes of the flexible water-stopping member holding plate. Mounting bolts interposed between the water-stopping member mounting girder and the flexible water-stopping member holding plate and disposed in the bolt holes for the mounting bolts. More movable Shiwatome water member is characterized in that it has secured to movable Shiwatome water member mounting digits. According to the present invention, the inner peripheral surfaces of the flexible water-stopping member mounting girder and the flexible water-stopper member holding plate are flush with the inner peripheral surface of the mortar to be applied to the segment. A flexible water-stopping member mounting girder and a flexible water-stopping member holding plate, and the inner peripheral end surface of the fixing portion of the flexible water-stopping member has a bolt hole for a mounting bolt of the flexible water-stopping member mounting girder and a flexible bolt. A flexible water-stopping member is interposed between the flexible water-stopping member mounting girder and the flexible water-stopping member holding plate so as to be located on the outer peripheral side of the bolt hole for the mounting bolt of the flexible water-stopping member holding plate. Since the flexible water-stopping member is fixed to the flexible water-stopping member mounting girder by the mounting bolts provided in the bolt holes for the mounting bolts, the flexible water-stopping member mounting girder forming the flexible joint, From the inner peripheral surface of the two segments to which both the flexible water stopping member holding plate and the flexible water stopping member are connected Since the same plane as the segment is formed in the flexible joint portion without protruding into the conduit, a smooth inner surface can be secured as the whole conduit. Further, since the notch for inserting the thrust receiving member is formed in each of the flexible water-stopping member mounting girder and the flexible water-stopping member pressing plate, the thrust receiving member is inserted through these notches. By installing, it is possible to transmit the thrust between the two connected segments while preventing the thrust receiving material from protruding into the pipeline when the tunnel is constructed. Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 and 2 are partial sectional views showing an embodiment of a flexible joint according to the present invention. FIG. 1 is a partial sectional view of a fixed portion, and FIG. 2 is a partial sectional view of a thrust receiving material insertion portion. It is. The joint 1 has, as essential components, flexible water-stopping member mounting beams 3, 3 'and flexible water-stopping member pressing plates 4, 4'.
And a flexible water blocking member 5. The same numbers are used for the pair of left and right components in the figure, and "'"
In the following description, only the components on the left side of the figure will be described in some cases. The pair of flexible water-stopping member mounting beams 3, 3 'is formed of an annular plate-like member, and is disposed between opposing ends 2a, 2a' of two steel segments 2, 2 'to be connected. You. The flexible water-stopping member attaching girder 3 is attached to the outer peripheral end of an annular outer girder 7 via a short tubular connecting plate 6 welded to the outer peripheral end thereof, and the outer girder 7 is a segment end 2a. Are fixed by bolts and nuts 9. The connection plate 6 protrudes inward in the joint axial direction from the joint with the flexible water-stopping member mounting girder 3,
The protective cover 10 protects a flexible water blocking member 5 described later from earth and sand that enters from the outside. Reference numeral 18 denotes a cover plate having one end welded to the connection plate 6 or 6 '. As shown in the front view of FIG. 3, the flexible water-stopping member mounting beam 3 is composed of a member 3a obtained by dividing an annular member into a plurality of members in a circumferential direction, and a plurality of bolt holes 3c for mounting bolts.
The fixing portions 3b for fixing the flexible water-stopping member are formed at predetermined intervals in the circumferential direction, and between the fixing portions 3b, the outer ends of the mounting holes 3c for the mounting bolts in the joint radial direction are provided. A notch 3d for inserting a thrust receiving member is formed on the inner peripheral side from the same circumferential position. The depth of the notch 3d is designed to be larger than the height of the thrust receiving member. A connecting plate 3e (see FIG. 1) projecting outward in the axial direction of the joint is fixed to both ends in the circumferential direction of each of the divided members 3a of the flexible water-stopping member mounting beam 3, and the flexible water-stopping members adjacent in the circumferential direction are fixed. By fixing the connecting plates 3e of the mounting girder dividing member 3a with bolts 11, the annular flexible water blocking member mounting girder 3 is formed. The flexible water-stopping member pressing plate 4 is disposed axially inside the flexible water-stopping member mounting girder 3 and, as shown in the front view of FIG. 4, divides the annular member into a plurality of members in the circumferential direction. Member 4
a, a plurality of fixing portions 4b for fixing a flexible water blocking member having a plurality of mounting bolt bolt holes 4c formed therein are formed at predetermined intervals in a circumferential direction. A notch 4d for inserting a thrust receiving material is formed on the inner peripheral side from a position on the same circumference as the outer end of the mounting hole 4c in the radial direction of the joint. The depth of the notch 4d is designed to be larger than the height of the thrust receiving member. The size and shape of each fixing part 4b and each thrust receiving material insertion notch 4d substantially match the size and shape of the fixing part 3b and thrust receiving material insertion notch 3d of the flexible watertight member mounting girder 3. It is formed as follows. As shown in the enlarged cross-sectional view of the fixed portion in FIG. 6, a flexible water-stopping member engaging portion 4f slightly projecting outward in the axial direction and an inner side in the axial direction are provided at the outer peripheral end of each flexible water-stopping member holding plate. A top plate 4e having a flexible water-stopping member supporting portion 4g extending toward the top is fixed. An attachment bolt tightening liner 12 made of a round bar is welded and fixed to the inner peripheral end of the fixing portion 4b on the outside in the axial direction. Each divided member 4 of the flexible water blocking member holding plate 4
No connecting plate is provided at both ends of the member a, and the annular flexible water-stopping member holding plate 4 is formed by arranging the plurality of flexible water-stopping member holding plate dividing members 4a in the circumferential direction without any gap. . The flexible water blocking member 5 is a short tubular member made of a flexible member such as rubber or synthetic resin, and has a bulging portion 5a bulging inward at the center in the axial direction. A fixing portion 5b extending in the radial direction is formed at both ends in the axial direction. The inner peripheral surface of the bulging portion 5a is designed so as not to protrude inward from the inner peripheral surface of the fixed portion. As shown in the enlarged cross-sectional view of the flexible water blocking member in FIG. 5, the fixing portion 5b has a water blocking lip 5c formed on the outside in the axial direction, and has an annular recessed outside on the outside in the axial direction at the outer peripheral end on the inside in the axial direction. A concave portion 5d is formed, and when the flexible water-stopping member 5 is mounted, the flexible water-stopping member engaging portion 4f of the flexible water-stopping member pressing plate 4 is engaged in the concave portion 5d to stop the flexible water-stopping member. The water member 5 is configured to be more securely fixed. In the illustrated example, the flexible water blocking member 5
Has a reinforcing cloth 13 embedded therein. In FIG. 5, no bolt hole is formed in the flexible water-stopping member 5, and the height H1 from the inner peripheral surface to the outer peripheral surface of the flexible water-stopper 5 is the state after the completion of the flexible joint construction. In the flexible water blocking member mounting girder 3
Is designed so as not to exceed the height H2 (FIG. 3) from the radially outer end of the mounting bolt mounting hole 3c to the inner peripheral surface of the protective cover 10. The flexible water-stopping member mounting girder 3 and the flexible water-stopping member holding plate 4 have their inner peripheral surfaces flush with the finished inner peripheral surface of the mortar applied to the segments 2, 2 '. And the bolt hole 4c for the mounting bolt of the flexible water-stopping member holding plate 4 and the bolt hole 3c for the mounting bolt of the flexible water-stopping member mounting girder.
And are arranged so as to match. The flexible water-stopping member 5 has an inner peripheral end surface 5e of the fixing portion 5b and a bolt hole 3c for a mounting bolt of the flexible water-stopping member mounting beam 3 and a mounting bolt of the flexible water-stopping member holding plate 4. It is interposed between the flexible water-stopping member mounting beam 3 and the flexible water-stopping member pressing plate 4 so as to be located on the outer peripheral side of the hole 4c, and is inserted into each of the bolt holes 3c and 4c for mounting bolts. The flexible water-stopping member 5 is pressed and fixed to the flexible water-stopping member mounting girder 3 via the flexible water-stopping member holding plate 4 by tightening the mounting bolt 14 and the nut 15 screwed thereto. I have. FIGS. 3 and 8 show the space between the outer girder 7 and the portion of the flexible water-stopping member mounting girder 3 on the outer peripheral side from the thrust receiving material insertion notch 3d of the flexible water-stopping member mounting girder 3. As shown, a thrust receiving material mounting plate 16 is disposed, and both ends of the mounting plate 16 are fixed by welding to the axially outer surface of the flexible water-stopping member mounting beam 3 and the axially inner surface of the outer beam 7. In FIG. 2, which shows a state after the completion of the flexible joint, the thrust receiving material mounting plate 16 conforms to the shape of the notch 3d for preventing mortar from flowing out from the thrust receiving material insertion notch 3d. The cover member 17 having the following shape is bolted. In order to construct the flexible joint 1, as shown in the partial sectional view of FIG. 7, the flexible water-stopping member 5 is attached to the flexible water-stopping member pressing plate 4 by the mounting bolts 14 and the nuts 15. 7 and 8, the thrust receiving member insertion notch 4d of the flexible water-stopping member holding plate 3 and the flexible water-stopping member A plate-shaped thrust receiving material 19 is inserted into the thrust receiving material insertion notch 3d, and both ends 19a, 19a 'are bolted to the thrust receiving material mounting plates 16, 16'. After transmitting the thrust between the segments 2 and 2 'via the thrust receiving member 19, the thrust receiving member 19 is removed, and the cover member 17 is bolted using the thrust receiving member mounting bolt hole of the thrust receiving member mounting plate 16. I do. Next, the mortar 20 is filled into the space between the flexible water-stopping member mounting girder 3 and the outer girder 7 of the segments 2 and 2 ′ and the joint 1 to form a smooth inner peripheral surface through the segments 2 and 2 ′ and the joint 1. The installation of the joint 1 is completed. The thrust receiving member is not limited to the thrust receiving member 19 shown in FIG. A modified example of the thrust receiving member is shown in a plan view of FIG. The thrust receiving member 19 of FIG. 7 receives the thrust with the shear strength of the bolt 24. When the thrust acting on the segment is relatively small, the thrust receiving member 19 of FIG. 7 is sufficient, but the thrust is large. In such a case, there is a possibility that the bolt 24 is broken by an excessive thrust acting on the bolt 24.
Therefore, when the thrust is large, a thrust receiving member 22 having tapered ends as shown in the plan view of FIG. 10A is prepared, while the thrust receiving member 22 shown in the plan view of FIG. 2
A pair of liners 23, 23 'provided with a taper matching the taper of No. 2 are welded to outer girders 23, 23' in advance at a factory, and a thrust receiving member is formed at a construction site as shown in FIG. A large thrust can be dealt with by attaching the thrust receiving member so that 22 is fitted between the liners 23 and 23 '. FIG. 11 shows a cross-sectional view of a joint similar to FIG. 7 with the thrust receiving member 22 attached. When expansion or contraction displacement or shear displacement occurs between the segments 2 and 2 'due to ground deformation due to an earthquake or the like, these displacements can be absorbed by deforming the flexible water blocking member 5. As described above, according to the present invention, each inner peripheral surface of the flexible water-stopping member mounting girder and the flexible water-stopping member holding plate is provided on the inner peripheral surface of the mortar to be applied to the segment. The flexible water-stopping member mounting girder and the flexible water-stopping member holding plate are arranged so as to be flush with the surface, and the inner peripheral side end surface of the fixing portion of the flexible water-stopping member has the flexible water-stopping member mounting girder. The flexible water-stopping member and the flexible water-stopping member are positioned so as to be located on the outer peripheral side of the bolt holes for the mounting bolts and the bolt holes for the mounting bolts of the flexible water-stopping member holding plate. Since the flexible water-blocking member is fixed to the mounting column of the flexible water-blocking member by the mounting bolts provided in the bolt holes for the mounting bolts, the flexible joint is configured. Two to which all of the flexible water-stopping member mounting girder, the flexible water-stopping member holding plate and the flexible water-stopping member are connected Without protruding into the pipeline from the inner peripheral surface of the segment, and the same plane as the segment is formed in the flexible joint portion, so that a smooth inner surface can be secured as the entire pipeline. Further, since the notches for inserting the thrust receiving member are formed in the flexible water-stopping member mounting girder and the flexible water-stopping member holding plate, respectively, the thrust receiving member is inserted through these notches. By installing, it is possible to transmit the thrust between the two connected segments while preventing the thrust receiving material from protruding into the pipeline when the tunnel is constructed.

【図面の簡単な説明】 【図１】本発明の可撓継手の１実施形態の固定部を示す
部分断面図である。 【図２】同実施形態の推力受材挿入部を示す部分断面図
である。 【図３】同実施形態の可撓止水部材取付桁の正面図であ
る。 【図４】同実施形態の可撓止水部材押え板の正面図であ
る。 【図５】可撓止水部材の断面図である。 【図６】可撓止水部材押え板の拡大断面図である。 【図７】継手の施工時に推力受材を取付けた状態を示す
部分断面図である。 【図８】推力受材を取付けた状態の可撓止水部材取付桁
を示す正面図である。 【図９】従来の可撓継手の施工状態を示す部分断面図で
ある。 【図１０】推力受材の変更例を示す平面図である。 【図１１】図１０の推力受材を取付けた状態の継手の部
分断面図である。 【符号の説明】 １ 継手 ２、２’ セグメント ３、３’ 可撓止水部材取付桁 ３ｂ、３ｂ’ 固定部 ３ｄ、３ｄ’ 推力受材挿入用切欠き部 ４、４’ 可撓止水部材押え板 ４ｂ、４ｂ’ 固定部 4ｄ、４ｄ’ 推力受材挿入用切欠き部 ５ 可撓止水部材 １４、１４’ 取付ボルトBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional view showing a fixing part of one embodiment of a flexible joint according to the present invention. FIG. 2 is a partial cross-sectional view showing a thrust receiving member insertion portion of the embodiment. FIG. 3 is a front view of the flexible water blocking member mounting girder of the embodiment. FIG. 4 is a front view of the flexible water blocking member holding plate of the embodiment. FIG. 5 is a sectional view of a flexible water blocking member. FIG. 6 is an enlarged sectional view of a flexible water-stopping member holding plate. FIG. 7 is a partial cross-sectional view showing a state in which a thrust receiving member is attached during the installation of the joint. FIG. 8 is a front view showing the mounting girder of the flexible water blocking member with the thrust receiving member mounted thereon. FIG. 9 is a partial cross-sectional view showing a state of construction of a conventional flexible joint. FIG. 10 is a plan view showing a modified example of a thrust receiving member. 11 is a partial sectional view of the joint in a state where the thrust receiving member of FIG. 10 is attached. [Description of Signs] 1 Joint 2, 2 ′ Segment 3, 3 ′ Flexible water-stopping member mounting girder 3 b, 3 b ′ Fixed portion 3 d, 3 d ′ Notch portion 4, 4 ′ for inserting thrust receiving material Flexible water-stopping member Holding plate 4b, 4b 'Fixed portion 4d, 4d' Notch portion 5 for inserting thrust receiving material Flexible water blocking members 14, 14 'Mounting bolt

Claims (1)

(57)【特許請求の範囲】 【請求項１】 シールド工法によって構築される管路の
シールドセグメントを接続する継手であって、 接続される２つのセグメントの対向する端部間に配置さ
れ、環状の板状部材からなり、取付ボルト用ボルト孔が
形成された固定部が周方向に所定間隔で形成されるとと
もに該固定部の間には内周側に推力受材挿入用切欠き部
が形成された１対の可撓止水部材取付桁と、 該可撓止水部材取付桁の軸方向内側に配置され、環状の
板状部材からなり、取付ボルト用ボルト孔が形成された
固定部が周方向に所定間隔で形成されるとともに該固定
部の間には内周側に推力受材挿入用切欠き部が形成され
た１対の可撓止水部材押え板と、 ゴム・合成樹脂等からなる短筒状の部材であって、軸方
向両端部には半径方向に延長する固定部が形成された可
撓止水部材とを備え、 該可撓止水部材取付桁と該可撓止水部材押え板の各内周
面が該セグメントに施工されるモルタルの内周面と同一
平面になるようにして、かつ該可撓止水部材押え板の該
取付ボルト用ボルト孔と該可撓止水部材取付桁の該取付
ボルト用ボルト孔とが整合するようにして該可撓止水部
材取付桁と該可撓止水部材押え板を配置するとともに、
該可撓止水部材の固定部の内周側端面が該可撓止水部材
取付桁の取付ボルト用ボルト孔および該可撓止水部材押
え板の取付ボルト用ボルト孔よりも外周側に位置するよ
うにして該可撓止水部材を該該可撓止水部材取付桁と該
可撓止水部材押え板の間に介装し、該各取付ボルト用ボ
ルト孔に配設された取付ボルトにより該可撓止水部材を
該可撓止水部材取付桁に対し固定したことを特徴とする
薄型セグメント用可撓継手。(57) [Claim 1] A joint for connecting a shield segment of a pipeline constructed by a shield method, wherein the joint is arranged between opposed ends of two segments to be connected, and is annular. A fixed portion having a bolt hole for a mounting bolt is formed at a predetermined interval in a circumferential direction, and a notch portion for inserting a thrust receiving material is formed on the inner peripheral side between the fixed portions. A pair of flexible water-stopping member mounting girder, and a fixing portion which is disposed axially inside the flexible water-stopping member mounting girder and is formed of an annular plate-like member and in which bolt holes for mounting bolts are formed. A pair of flexible water-stopping member pressing plates formed at predetermined intervals in the circumferential direction and formed with cut-out portions for inserting a thrust receiving material on the inner circumferential side between the fixed portions, rubber, synthetic resin, etc. A short cylindrical member made of A flexible water-stopping member having a portion formed therein, wherein each inner peripheral surface of the flexible water-stopping member mounting girder and the flexible water-stopping member pressing plate is the same as the inner peripheral surface of the mortar applied to the segment. The flexible water-stopping member is fixed so that the bolt holes for the mounting bolts of the flexible water-stopping member holding plate and the bolt holes for the mounting bolts of the flexible water-stopping member mounting beam are aligned with each other. A water member mounting girder and the flexible water blocking member holding plate are arranged,
The inner peripheral end surface of the fixing portion of the flexible water-stopping member is located on the outer peripheral side with respect to the mounting bolt bolt hole of the flexible water-stopping member mounting girder and the mounting bolt bolt hole of the flexible water-stopping member holding plate. In this way, the flexible water-stopping member is interposed between the flexible water-stopping member mounting beam and the flexible water-stopping member holding plate, and the mounting bolts are provided in the bolt holes for the mounting bolts. A flexible joint for a thin segment, wherein a flexible water blocking member is fixed to the flexible water blocking member mounting girder.