JP2004162339A

JP2004162339A - Cut off joint for manhole, pipe joint, manhole structure, and work execution method for the structure

Info

Publication number: JP2004162339A
Application number: JP2002328420A
Authority: JP
Inventors: Hideo Tanaka; 秀夫田中; Fumio Kadota; 文夫門田; Shuichi Suzuki; 秀一鈴木; Tetsushi Suyama; 哲志陶山
Original assignee: Hayakawa Rubber Co Ltd
Current assignee: Hayakawa Rubber Co Ltd
Priority date: 2002-11-12
Filing date: 2002-11-12
Publication date: 2004-06-10
Anticipated expiration: 2022-11-12
Also published as: JP4047139B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cut off joint for a manhole developing a stable watertightness, a pipe joint for a manhole, and a manhole structure in a joint part of the manhole and a pipe body, in particular even in a joint part of a small diameter manhole and a large diameter pipe body. <P>SOLUTION: The cut off joint 1 for a manhole of one of the examples is formed of a joint body 8 and a widening jig 9. The joint body 8 is provided with a drilling hole side cut off part 8a coming into contact with a manhole cut hole part 2a, a sleeve side cut off part 8b coming into contact with a sleeve 4, and a water holding pressure part 8c connecting both cut off parts. The widening jig 9 widens the space between the drilling side cut off part 8a and the sleeve side cut off part 8b. The cut off joint 1 for the manhole is disposed at the outside of the radial direction of the sleeve 4 and the space between the drilling hole side cut off part 8a and the sleeve side cut off part 8b is widened and the drilling hole side cut off part 8a is fixedly press-fitted to the hole drilling part 2a, and the sleeve side cut off part 8b is fixedly press-fitted to the sleeve pipe 4. In this way, a manhole structure 7 developing a stable water tightness can be obtained. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、下水道等のマンホールと下水管等の管体の接続部に使用するマンホール用止水継手、管継手、マンホール構造及びその施工方法に関する。
【０００２】
【従来の技術】
従来のマンホールと管体との接続は接続部をコンクリート巻立てする工法が主流であったが、コンクリートの硬化時間待ちや地盤沈下及び地震等でクラックが発生し、不明水の浸入が起こり易いことより、ゴムや軟質プラスチックを材料に用いた止水可とう継手が多用されるようになってきた。かかる継手は地盤の変位等で、マンホールと管体との相対的位置関係が変位した場合でも、その変位に追従し水密性を維持できる。
【０００３】
かかる継手は筒状のゴム成型物を拡張バンドでマンホール削孔面に固定する工法が一般的であるが、削孔径が大きい４００ｍｍ径程度以上の管体では、拡張バンドが削孔面よりはみ出すためこの方式は適用できない（例えば、特許文献１参照）。
【０００４】
【特許文献１】
特開２００２−２９４７２７号公報
【０００５】
止水可とう継手を、拡張バンドを使用せずに、マンホール削孔部に接続する場合には、いくつかの技術が開発されている。例えば、図１０に示すような従来の継手機構がある。継手機構１０１は、マンホール等の埋設構造物１０２に管路端部１０３を接続するためのもので、剛体による筒形リング材１０４に、ゴム等よりなる筒状パッキング１０５を接着し、筒形リング材１０４と埋設構造物１０２の接続口１０２ａとの間にモルタル又はコンクリート等の充填凝結材１０６を充填固定し、管路を形成する（例えば、特許文献２参照）。
【０００６】
【特許文献２】
特開平９‐１１２７４２号公報（第５図）
【０００７】
また、例えば、図１１に示すような従来のマンホール用可撓継手がある。継手２０１は、マンホール体２０２の接続穴の内周面２０２ａと接続管２０３の外周面との間に配置される筒状の接続本体２０４と、接続本体２０４と接続穴の内周面２０２ａとの間で配置される弾性環状体２０５とからなり、弾性環状体２０５を軸方向に締圧して弾性膨出させる膨出水密機構２０６を有する（例えば、特許文献３参照）。
【０００８】
【特許文献３】
特開平９‐１４４０４３号公報（図１）
【０００９】
【発明が解決しようとする課題】
特許文献２の技術では、削孔部と剛体の筒形リングとの間はモルタルやコンクリートで固定し止水する方式のため、生コンクリートの管理や充填作業の管理を徹底する必要があり、また、運搬時や埋設前後にマンホールや筒形リング材に衝撃が加わると、コンクリートがひび割れし、下水の漏水や地下水が浸入する危険性がある。
【００１０】
特許文献３の技術では、弾性環状体を軸方向に圧縮し膨出させる必要があり、弾性体は軟らかいほど圧縮され易く隙間を埋め易いけれども、地下に埋設された後、接続管が土圧を受け、接続管の下部で弾性環状体が集中荷重を受けるため、容易に圧縮変形し、その結果、接続管が沈下し下水勾配に狂いを生じる。また、接続管の上部は、接続管の沈下により圧着力が低下するか、又は削孔部及び接続管の間に隙間が生じ、漏水する危険性がある。
【００１１】
反対に、硬い弾性体を使用すると、圧縮し難いため膨出量が小さくなり、削孔部と接続本体の隙間を埋め難く、漏水する危険性があり、地下に埋設後には、上記と同様な危険性がある。
【００１２】
本発明の課題は、マンホールと管体との接続部、特に、小径のマンホールと大口径の管体との接続部でも、安定した水密性を発揮するマンホール用止水継手、マンホール用管継手及びマンホール構造を得ることである。
【００１３】
【課題を解決するための手段】
本発明は、マンホールの削孔部内に配置される管体より大径で前記削孔部径より小径の剛性の鞘管と、前記削孔部との間を止水するためのマンホール用止水継手であって、前記削孔部に当設する削孔側止水部と、前記鞘管に当設する鞘管側止水部と、両止水部を繋ぐ受水圧部とを具える継手本体、及び前記削孔側止水部及び前記鞘管側止水部の間を拡張する拡張治具を備えており、前記鞘管の半径方向外側に配置され、前記拡張治具による前記削孔側止水部及び前記鞘管側止水部の間の拡張によって、前記削孔側止水部が前記削孔部に圧着固定され、かつ前記鞘管側止水部が前記鞘管に圧着固定されることを特徴とするマンホール用止水継手に係るものである。また、本発明は、かかる止水継手を用いるマンホール用管継手、マンホール構造及びマンホール構造の施工方法に係るものである。
【００１４】
本発明者は、前述したように、主に従来のゴム製可とう継手を直接マンホールの削孔面に拡張バンドで圧着固定する場合、マンホール径が小さいか、管径が大きくなると、ゴム製可とう継手が拡張バンドでマンホール削孔面全周にわたり均一に拡がらず、ゴム製可とう継手を削孔面に圧着するのが難しいことを見出している。
【００１５】
一方、前述したように、図１０及び１１に示す従来技術では、ゴム製可とう継手を、拡張バンドを使用せずにマンホール削孔面に圧着させることができるが、本発明者の検討によれば、かかる技術では、以下のような問題があることが分かった。
【００１６】
図１０に示す従来技術では、ゴム製可とう継手１０５は一方を管１０３に、他方を鞘管１０４に接続固定され、鞘管１０４とマンホール１０２との隙間はモルタル又はコンクリート１０６が充填され止水固定されている。
【００１７】
一般的には、マンホールメーカーの工場で、ゴム製可とう継手の取り付け及び手作業によるモルタル固定がされ、工事現場に運搬されるが、運搬時の振動及び工事現場での管接続時や埋め戻し時に、管や埋設土の衝撃を受け、モルタル固定部が同様にひび割れし易く、埋設後に漏水や地下水の浸入が起こり易い。また、モルタル固定は手作業のため、完全な止水をするには熟練を要する。
【００１８】
図１１に示す従来技術では、図１０のモルタル固定部１０６に代えて、膨出水密機構２０６により弾性環状体２０５の外周面をたわみ弾性膨出させ、マンホール２０２の削孔面２０２ａと鞘管２０４との間の隙間を止水するものであり、弾性環状体２０５は、ゴムや樹脂等の弾性体でリング状に製作される。
【００１９】
弾性環状体２０５は、硬度が低いと膨出させ易いが、埋設後の土圧等で管２０３が沈下し易く、硬いと管沈下し難くなるが、膨出させ難くなり、止水性が悪くなる。
【００２０】
かかる知見の下、本発明者は、埋設後の土圧によって影響されることのない、安定した水密性を発揮するマンホール構造を得るため、種々のマンホール用管継手を試作し、検討した。
【００２１】
その結果、本発明者は、剛性の鞘管とマンホールの削孔部との間で、所定の止水継手の削孔側止水部及び鞘管側止水部を拡張治具によって削孔部及び鞘管に圧着固定することで、安定した水密性を発揮するマンホール構造が得られることを突き止め、本発明に至った。
【００２２】
本発明によれば、所定の止水継手を管体の外周の鞘管とマンホールの削孔部とに圧着固定することで、マンホールの削孔部径や管体の管径に左右されないで、安定した水密性が発揮されるマンホール構造が得られる。
【００２３】
【発明の実施の形態】
本発明の実施をする形態について説明する。
（１）マンホール
種々の材質、種々の形状のものからなることができる。マンホールの多くは円筒形状のものであるが、ボックスカルバートのような断面が四角形状等の筒形形状のものでもよい。削孔部は種々の方法により、種々の形状に設けることができる。
【００２４】
（２）管体
マンホールの削孔部内に配置される。種々の材質、種々の形状のものからなることができる。
【００２５】
（３）マンホールと管体との接続部
マンホールと管体との接続部は、通常、円形の削孔部に円筒形状の管体を接続する接続部の例が多いが、ボックスカルバートのような四角形の削孔部及び管体の接続部も含まれる。
【００２６】
（４）鞘管
管体より大径でマンホールの削孔部径より小径の剛性を有するものである。削孔部と管体との間のマンホール用止水継手及び可とう継手が十分な止水性を発揮できる限り、種々の材質、種々の形状からなることができる。
【００２７】
（４）マンホール用止水継手
鞘管と削孔部との間を止水するためのもので、鞘管の半径方向外側に配置される。継手本体と拡張治具とからなることができる。継手本体は、削孔部に当設する削孔側止水部と、鞘管に当設する鞘管側止水部と、両止水部を繋ぐ受水圧部とを具える。
【００２８】
（４−１）削孔側止水部
削孔部に当設する削孔側圧縮部と、この削孔側圧縮部をマンホールの削孔部に圧着固定させる削孔側押圧板とからなることができる。削孔側押圧板は削孔側圧縮部の半径方向内側に配置されてもよい。
【００２９】
削孔側止水部は、削孔側押圧板が芯材として削孔側圧縮部内に埋設されたものであってもよい。
【００３０】
好ましくは、削孔側押圧板は周方向で分断されている。かかる分断された削孔側押圧板は、一体の環状の削孔側押圧板と比べ、外径が削孔部径よりも小さくても、削孔側止水部を十分に拡径させることができ、削孔側止水部を削孔部に十分に圧着固定させることができる。
【００３１】
削孔側止水部は、拡張治具としてボルトを用いる場合、ボルトの先端を受け、ボルトの回転を自由にさせる働きをする回転軸受けを有することができる。回転軸受けは、削孔側押圧板に当たるボルトのセット位置が大きく動かないようにすることができればよく、種々の形状でよい。
【００３２】
（４−２）鞘管側止水部
鞘管に当設する鞘管側圧縮部と、この鞘管側圧縮部を鞘管に圧着固定させる鞘管側押圧板とからなることができる。好ましくは、鞘管側押圧板は鞘管側圧縮部の半径方向外側に配置され、削孔側押圧板と同様であるが鞘管側止水部を十分に縮径させる理由から、周方向で分断されている。
【００３３】
鞘管側止水部は、拡張治具としてボルトを用いる場合、鞘管側圧縮部及び鞘管側押圧部等に、前記ボルトを貫通する貫通孔が設けられる。
【００３４】
（４−３）受水圧部
削孔側止水部と鞘管側止水部を繋ぐものである。受水圧部は、削孔側止水部と鞘管側止水部との関係で、断面で見たとき、継手本体が略コの字状の形態を有するような関係になる。受水圧部は、拡張治具による鞘管側圧縮部と削孔側圧縮部の径の変位に容易に追従できる意味で、断面くの字状、波状、蛇腹状等の形状を有することができる。
【００３５】
（４−４）拡張治具
削孔側止水部及び鞘管側止水部の間を拡張するものである。かかる拡張治具による削孔側止水部及び鞘管側止水部の間の拡張によって、削孔側止水部がマンホールの削孔部に圧着固定され、かつ鞘管側止水部が鞘管に圧着固定される。
【００３６】
拡張治具はボルトからなることができる。かかるボルトは、鞘管、鞘管側圧縮部及び鞘管側押圧板を貫通し、鞘管側押圧板と螺合することができる。また、かかるボルトは、鞘管側押圧板の半径方向外側のナットと螺合することができる。好ましくは、ナットは溶接等で鞘管側押圧板に固定されている。
【００３７】
拡張治具としてのボルトは、鞘管等の貫通孔を貫通しない頭部を有することができる。かかる頭部は、ボルト又はナットを締め込むことにより、頭部とナット又は鞘管側押圧板との間で鞘管と鞘管側止水部との密着をより一層強固にすることができる。
【００３８】
（５）可とう継手
特に制限されることなく、鞘管と管体との間を止水するための従来公知の可とう継手を用いることができる。
【００３９】
（６）マンホール用管継手
上述のマンホール用止水継手、鞘管及び可とう継手を予め組合せ、マンホール用管継手として用いることで、安定した水密性を発揮するマンホール構造を施工することができる。
【００４０】
（７）マンホール用止水継手及び可とう継手の材質
マンホール用止水継手の継手本体及び可とう継手は弾性体製のものからなることができる。かかる弾性体は、スチレン・ブタジエンゴム、ＥＰＤＭ、ＣＲ等の合成ゴムや、天然ゴム、軟質塩化ビニル樹脂、塩化ビニル系エラストマー、及びスチレン系熱可塑性エラストマー等からなる群より選ばれる少なくとも１種の材料からなることができる。
【００４１】
（８）鞘管、削孔側押圧板、鞘管側押圧板、ボルト及びナットの材質
鞘管、削孔側押圧板、鞘管側押圧板、ナット、ボルト等の剛性体は、ステンレス鋼、アルミニウム、防錆メッキ鋼、防錆被覆鋼材等の金属や、塩化ビニル樹脂、ＡＢＳ樹脂、ＰＥＴ樹脂等の硬質プラスチックや、ＦＲＰ等の繊維補強プラスチック等からなる群より選ばれる少なくとも１種の材料からなることができる。これらの各材料は腐食し難いので望ましい。
【００４２】
（９）マンホール構造の施工方法
上述のマンホール用管継手によって、以下のようにして、マンホールの削孔部と管体とが水密に接続されているマンホール構造を施工することができる。
【００４３】
マンホール構造を施工するにあたり、まず、上述のマンホール用管継手を準備する。かかるマンホール用管継手は、上述のようなマンホール用止水継手、鞘管及び可とう継手の組合せからなることができる。次いで、かかるマンホール用管継手を、以下の工程を含むように用いれば、安定した水密性を発揮するマンホール構造を施工することができる。
【００４４】
可とう継手を鞘管の半径方向内側に固定すること、止水継手を鞘管の半径方向外側に配置すること、拡張治具を削孔側止水部及び鞘管側止水部の間に配置すること、拡張治具の拡張によって、削孔側止水部を削孔部に圧着固定するとともに鞘管側止水部を鞘管に圧着固定すること。
【００４５】
拡張治具がボルトからなる場合、かかる拡張治具は、ボルトを、鞘管、鞘管側圧縮部及び鞘管側押圧板に貫通させ、少なくとも、鞘管側押圧板又は鞘管側押圧板の半径方向外側のナットと螺合させることで、継手本体の削孔側止水部及び鞘管側止水部を拡径し、これらを削孔部及び鞘管に圧着固定させることができる。
【００４６】
ボルトと鞘管側押圧板との螺合では、ボルトを回転させることで、継手本体の削孔側止水部及び鞘管側止水部を拡径することができる。ボルトとナットとの螺合では、ボルト及びナットの少なくとも一方を回転させることで、継手本体の削孔側止水部及び鞘管側止水部を拡径することができる。
【００４７】
図面を参照して、本発明をより一層詳細に説明する。
図１は本発明の１例のマンホール用止水継手の取り付け状態を示す縦断面図である。図２は図１のマンホール用止水継手の横断面図である。図３は図１のマンホール用止水継手の拡大図である。図４は図１のマンホール用止水継手をマンホール内側から見た正面図である。図５は図４のＡ部を詳細に示す斜視図である。
【００４８】
図６（ａ）は図１のマンホール止水継手の継手本体の正面図であり、図６（ｂ）は図１のマンホール止水継手の継手本体の平面図である。図７は図１の削孔側押圧板、鞘管側押圧板及びボルトを示す斜視図である。
【００４９】
図８は図１の鞘管をマンホールの上面から見た平面図である。図９（ａ）は図１のマンホール用止水継手が拡張される前の縦断面図である。図９（ｂ）は図１のマンホール用止水継手の削孔側止水部が削孔面に圧着固定される仕組みを示す縦断面図である。図９（ｃ）は図１のマンホール用止水継手の鞘管側止水部が鞘管に圧着固定される仕組みを示す縦断面図である。
【００５０】
図１〜５に示すように、本発明の１例のマンホール用止水継手１は、マンホール２の削孔部２ａ内に配置される管体３より大径で削孔部２ａの径より小径の剛性の鞘管４と削孔部２ａとの間を止水する。マンホール用止水継手１は、鞘管４と可とう継手５と共に、マンホール用管継手６として用いて、安定した水密性を発揮するマンホール構造７を得ることができる。
【００５１】
マンホール用止水継手１は、図３に詳細に示すように、継手本体８と拡張治具９とからなり、継手本体８はマンホール削孔部２ａに当設する削孔側止水部８ａと、鞘管４に当設する鞘管側止水部８ｂと、両止水部を繋ぐ受水圧部８ｃとを具える。拡張治具９は削孔側止水部８ａ及び鞘管側止水部８ｂの間を拡張する。
【００５２】
マンホール用止水継手１は、図１、図２、図４及び図５に示すように、鞘管４の半径方向外側に配置され、拡張治具９によって削孔側止水部８ａ及び鞘管側止水部８ｂの間が拡張され、削孔側止水部８ａが削孔部２ａに圧着固定され、かつ鞘管側止水部８ｂが鞘管４に圧着固定されて、安定した水密性を発揮するマンホール構造７が得られる。なお、管体３と鞘管４との間は、可とう継手５によって十分な水密状態を維持することができる。
【００５３】
図３、図６（ａ）及び（ｂ）に詳細に示すように、マンホール用止水継手１の継手本体８は、削孔側止水部８ａが、削孔部２ａに当設する削孔側圧縮部８ｄと、削孔側圧縮部８ｄの半径方向内側に配置され削孔側圧縮部８ｄを削孔部２ａに圧着固定させる削孔側押圧板８ｅとからなり、鞘管側止水部８ｂが、鞘管４に当設する鞘管側圧縮部８ｆと、鞘管側圧縮部８ｆの半径方向外側に配置され鞘管側圧縮部８ｆを鞘管４に圧着固定させる鞘管側押圧板８ｇとからなることができる。
【００５４】
削孔側圧縮部８ｄ及び削孔側押圧板８ｅ並びに鞘管側圧縮部８ｆ及び鞘管側押圧板８ｇは予め接着しておいてもよい。また、削孔側押圧板又は鞘管側押圧板を削孔側圧縮部又は鞘管側圧縮部内に芯材として埋め込んで、削孔側止水部又は鞘管側止水部としてもよい。
【００５５】
削孔側圧縮部８ｄの半径方向外側と鞘管側圧縮部８ｆの半径方向内側とには止水突起８ｈ，８ｉを設けることができる。これらの止水突起８ｈ，８ｉは必要圧縮量に応じて形状を考慮することができる。また、継手本体８は、マンホール削孔部２ａの外周面に沿う形状の鍔部８ｊを有することができる。
【００５６】
図３、図５、図８及び図９（ａ）〜（ｃ）に詳細に示すように、拡張治具９はボルトからなることができる。また、このボルトは、特に、図７及び８に示すように、鞘管４、鞘管側圧縮部８ｆ及び鞘管側押圧板８ｇの貫通孔１０を貫通し、鞘管側押圧板８ｇと螺合してもよいが、鞘管側押圧板８ｇの半径方向外側で溶接等のナット固定部１１によって固定されているナット１２と螺合してもよい。
【００５７】
削孔側押圧板８ｅには、回転軸受け１３を設けることができる。回転軸受け１３は、拡張治具９としてのボルトの先端を受け、ボルトの回転を自由にさせる働きをする。回転軸受け１３は、削孔側押圧板８ｅのセット位置が大きく動かなくすることができればよく、他の形状でもよい。
【００５８】
図４、図５及び図８に詳細に示すように、削孔側押圧板８ｅ及び鞘管側押圧板８ｇは周方向で分断することができる。これらの押圧板の分割数は、削孔径や、止水継手の両止水部における必要圧縮強度等に応じて、任意に設定することができる。なお、図５では、分割された削孔側押圧板８ｅと鞘管側押圧板８ｇとの間が３本のボルトにより拡張されているが、ボルトの本数は、押圧板の分割数、止水部の必要圧縮強度によって任意に定めることができる。
【００５９】
図１及び２に示すように、円筒状の可とう継手５は、その一端が鞘管４の半径方向内側面に固定されているが、その一端を鞘管４の半径方向外側面に固定し、他端を管体３に固定して取り付けるものでもよい。また、鞘管と管体との間を止水するための可とう継手としては、ゴム製の止水リングのような可とう継手でもよい。
【００６０】
マンホール構造の施工方法は、図面の参照により一層明らかになる。
本発明のマンホール構造を施工するには、図１〜３、図５、図６及び図９に示すように、断面略コの字状で、削孔側圧縮部８ｄと鞘管側圧縮部８ｆとそれらを繋ぐ受水圧部８ｃとからなる継手本体８のコの字形状の内側に、分割された削孔側押圧板８ｅと鞘管側押圧板８ｇとが配置されているマンホール用止水継手１を用いることができる。また、かかるマンホール用止水継手１は、鞘管４及びマンホール用可とう継手５と一体にして、マンホール用管継手６として用いることができる。
【００６１】
図１、図２及び図４に示すような取り付け状態のマンホール構造７は、鞘管４のマンホール側端部とマンホール削孔部２ａとの間で、削孔部２ａの壁厚幅以内にマンホール用止水継手１をセットし、マンホール２の内側から、マンホール用止水継手１の拡張治具９としてのボルトを、鞘管４及び鞘管側止水部８ｂの貫通孔１０に貫通させ、ネジ回転させて、管継手３を削孔部７に取り付ける。なお、可とう継手５は、マンホール用止水継手１に当たらない程度に、鞘管４と管体３との間のマンホール外側部で予めセットしておく。
【００６２】
概して、この工程は、マンホールメーカーの工場で行われるが、工事現場で取り付けを行っても何ら問題はない。
【００６３】
図９（ａ）〜（ｃ）を参照して、拡張治具としてのボルトがマンホール用止水継手の削孔側止水部及び鞘管側止水部の間を拡張して削孔側止水部及び鞘管側止水部をマンホールの削孔部及び鞘管に圧着固定させる仕組みをより一層詳細に説明する。
【００６４】
拡張治具９としてのボルトは、鞘管４、鞘管側圧縮部８ｆ及び鞘管側押圧板８ｇにおいて同軸上に明けられた貫通孔１０を通り、ナット１２に達し、ボルトのネジ回転で削孔側押圧板８ｅに当設する。
【００６５】
図３及び図９（ａ）に示すマンホール用止水継手１は、マンホール２の削孔部２ａと鞘管４との間にセットされ、図９（ｂ）及び（ｃ）に示すように、拡張治具９としてのボルトの回転で削孔側押圧板８ｅと鞘管側押圧板８ｇとの間が拡張できる。
【００６６】
図９（ｂ）では、マンホール用止水継手１がマンホール２の削孔部２ａと鞘管４との間に配設され、拡張治具９としてのボルトの回転で削孔側押圧板８ｅが半径方向外側の削孔部２ａ方向に押圧されることにより、削孔側圧縮部８ｄの止水突起８ｈが圧縮変形する。
【００６７】
図９（ｃ）では、図９（ｂ）の状態から更にボルトを回転させた状態が示してあり、ボルトの先端部が削孔側押圧板８ｅの回転軸受け１３で止まった状態となり、更に回転を続けることにより、ナット１２及び鞘管側押圧板８ｇが半径方向内側の鞘管４方向に押圧され、鞘管側圧縮部８ｆの止水突起８ｉが圧縮変形し、削孔部２ａと鞘管４との間が止水できる。
【００６８】
このようにして施工されるマンホール構造は、削孔部に挿入された管体と削孔部との間で、管体及び鞘管の間が可とう継手で止水され、鞘管及び削孔部の間がマンホール用止水継手の削孔部側止水部と鞘管側止水部とによって安定した状態で止水される。
【００６９】
かかるマンホール構造では、マンホール削孔部の中心軸と鞘管の中心軸とがブレたりして、削孔部と鞘管との間隔が均一でなくなっても、マンホール用止水継手が削孔部と鞘管との間を十分な水密性で止水する。
【００７０】
図面に示す本発明の実施の形態では、円形の削孔部に円筒状の管体を接続する例を示したが、本発明のマンホール用止水継手は、ボックスカルバートのような四角形の削孔部及び管体にも適用できるものである。
【００７１】
【発明の効果】
以上の説明から明らかなように、本発明によれば、マンホール削孔部と管体との間に剛性の鞘管が介され、鞘管と削孔部との間で所定のマンホール用止水継手の削孔側止水部及び鞘管側止水部が拡張治具によって拡張され削孔部と鞘管とに圧着固定されるので、鞘管と管体との間を可とう継手で止水して得られるマンホール構造は、マンホールの削孔部径や管体の管径に左右されないで、安定した水密性を維持することができる。
【００７２】
特に、本発明によれば、マンホール用止水継手の削孔側止水部及び鞘管側止水部を、拡張治具による削孔側押圧板及び鞘管側押圧板の間の拡張によって削孔部内周面及び管体外面に合うように圧着固定することができるので、マンホール用止水継手の取り付けは、容易で熟練を必要とせず、確実で、特に大口径の管体とマンホールとの接続部に十分な可とう性と止水性を付与することができる。
【図面の簡単な説明】
【図１】本発明の１例のマンホール用止水継手の取り付け状態を示す縦断面図である。
【図２】図１のマンホール用止水継手の横断面図である。
【図３】図１のマンホール用止水継手の拡大図である。
【図４】図１のマンホール用止水継手のマンホール内側からの正面図である。
【図５】図４のＡ部を詳細に示す斜視図である。
【図６】（ａ）は図１のマンホール止水継手の継手本体の正面図であり、（ｂ）は図１のマンホール止水継手の継手本体の平面図である。
【図７】図１の削孔側押圧板、鞘管側押圧板及びボルトを示す斜視図である。
【図８】図１の鞘管をマンホールの上面から見た平面図である。
【図９】（ａ）は図１のマンホール用止水継手が拡張される前の縦断面図であり、（ｂ）は図１のマンホール用止水継手の削孔側止水部が削孔面に圧着固定される仕組みを示す縦断面図であり、（ｃ）は図１のマンホール用止水継手の鞘管側止水部が鞘管に圧着固定される仕組みを示す縦断面図である。
【図１０】（ａ）は従来の継手機構の横断面図であり、（ｂ）は従来の継手機構の立て断面図である。
【図１１】従来のマンホール用可撓継手の縦断面図である。
【符号の説明】
１マンホール用止水継手
２マンホール
２ａ削孔部
３管体
４鞘管
５可とう継手
６マンホール用管継手
７マンホール構造
８継手本体
８ａ削孔側止水部
８ｂ鞘管側止水部
８ｃ受水圧部
８ｄ削孔側圧縮部
８ｅ削孔側押圧板
８ｆ鞘管側圧縮部
８ｇ鞘管側押圧板
８ｈ，８ｉ止水突起
８ｊ鍔部
９拡張治具
１０貫通孔
１１ナット固定部
１２ナット
１３回転軸受け
１０１継手機構
１０２埋設構造物
１０２ａ接続口
１０３管路端部
１０４筒形リング材
１０５筒状パッキング
１０６充填凝結材
２０１継手
２０２マンホール体
２０２ａ接続穴の内周面
２０３接続管
２０４筒状の接続本体
２０５弾性環状体
２０６膨出水密機構[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a watertight joint for manholes, a pipe joint, a manhole structure, and a method of constructing the same, which are used in a connection portion between a manhole such as a sewer and a pipe such as a sewer pipe.
[0002]
[Prior art]
The conventional method of connecting manholes and pipes was to lay concrete at the joints, but cracks occurred due to waiting for concrete hardening time, land subsidence, earthquakes, etc. Waterproof flexible joints using rubber or soft plastic as a material have been increasingly used. Even if the relative positional relationship between the manhole and the pipe body is displaced due to the displacement of the ground or the like, such a joint can follow the displacement and maintain the watertightness.
[0003]
Such a joint is generally a method of fixing a cylindrical rubber molded product to a manhole drilling surface with an expansion band, but in a pipe body having a large drilling diameter of about 400 mm or more, the expansion band protrudes from the drilling surface. This method cannot be applied (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-2002-294727
Several techniques have been developed for connecting a waterstop flexible joint to a manhole drill without using an extension band. For example, there is a conventional joint mechanism as shown in FIG. The joint mechanism 101 is for connecting the pipe end 103 to a buried structure 102 such as a manhole, and a cylindrical packing 105 made of rubber or the like is adhered to a rigid cylindrical ring member 104 to form a cylindrical ring. A filling coagulant 106 such as mortar or concrete is filled and fixed between the material 104 and the connection port 102a of the buried structure 102 to form a pipe (for example, see Patent Document 2).
[0006]
[Patent Document 2]
JP-A-9-112742 (FIG. 5)
[0007]
Further, for example, there is a conventional manhole flexible joint as shown in FIG. The joint 201 includes a cylindrical connection main body 204 disposed between the inner peripheral surface 202a of the connection hole of the manhole body 202 and the outer peripheral surface of the connection pipe 203, and the connection main body 204 and the inner peripheral surface 202a of the connection hole. A swelling watertight mechanism 206, which comprises an elastic annular body 205 disposed therebetween, and elastically expands the elastic annular body 205 by compressing the elastic annular body 205 in the axial direction (for example, see Patent Document 3).
[0008]
[Patent Document 3]
JP-A-9-144043 (FIG. 1)
[0009]
[Problems to be solved by the invention]
In the technique of Patent Document 2, since the hole between the drilled portion and the rigid cylindrical ring is fixed with mortar or concrete and water is stopped, it is necessary to thoroughly control the management of the ready-mixed concrete and the filling work, and If impact is applied to the manhole or cylindrical ring material during transportation or before and after burial, concrete may crack and there is a danger of sewage leakage and groundwater intrusion.
[0010]
In the technology of Patent Document 3, it is necessary to compress and expand the elastic annular body in the axial direction. The softer the elastic body is, the easier it is to compress and fill the gap, but after being buried underground, the connecting pipe reduces the earth pressure. Since the elastic annular body receives a concentrated load at the lower part of the receiving and connecting pipes, it is easily compressed and deformed, and as a result, the connecting pipe sinks and the sewage gradient is disordered. In addition, the crimping force of the upper portion of the connecting pipe may be reduced due to the sinking of the connecting pipe, or a gap may be formed between the drilled portion and the connecting pipe, thereby causing a risk of water leakage.
[0011]
Conversely, when a hard elastic body is used, it is difficult to compress, so the swelling amount is small, it is difficult to fill the gap between the drilled portion and the connection body, there is a risk of water leakage, and after embedding underground, the same as above There is a risk.
[0012]
An object of the present invention is to provide a watertight joint for a manhole that exhibits stable watertightness, a pipe joint for a manhole, and a connection part between a manhole and a pipe, particularly, a connection part between a small diameter manhole and a large diameter pipe. Obtaining a manhole structure.
[0013]
[Means for Solving the Problems]
The present invention provides a watertight manhole for stopping water between a rigid sheath tube having a diameter larger than a pipe disposed in a bore of a manhole and smaller than the diameter of the bore, and the bore. A joint, comprising: a drilling-side water stopping portion provided in the drilling portion, a sheath pipe-side water stopping portion provided in the sheath tube, and a water receiving pressure portion connecting the water stopping portions. A main body, and an expansion jig for expanding between the drilling-side water stopping portion and the sheath tube-side water stopping portion, the drill being disposed radially outside the sheath tube, and drilling by the expansion jig. Due to the expansion between the side water stopping portion and the sheath tube side water stopping portion, the drilling side water stopping portion is crimped and fixed to the bore hole portion, and the sheath tube side water stopping portion is crimped and fixed to the sheath tube. The present invention relates to a watertight joint for manholes. The present invention also relates to a pipe joint for a manhole, a manhole structure, and a method for constructing a manhole structure using the watertight joint.
[0014]
As described above, the present inventor has found that when a conventional rubber flexible joint is directly fixed to the drilled surface of a manhole by pressure bonding with an expansion band, if the manhole diameter is small or the pipe diameter is large, the rubber flexible joint can be used. They find that it is difficult to crimp a rubber flexible joint to the drilled surface because the flexible joint is not spread uniformly over the entire perforated surface of the manhole by the extension band.
[0015]
On the other hand, as described above, in the prior art shown in FIGS. 10 and 11, a rubber flexible joint can be crimped to a manhole drilled surface without using an extension band. For example, it has been found that such a technique has the following problems.
[0016]
In the prior art shown in FIG. 10, one flexible rubber joint 105 is fixedly connected to a tube 103 and the other to a sheath tube 104, and a gap between the sheath tube 104 and the manhole 102 is filled with mortar or concrete 106 to stop water. Fixed.
[0017]
Generally, at the factory of the manhole maker, rubber flexible joints are attached and mortar is fixed manually, and then transported to the construction site.However, vibration during transportation and pipe connection at the construction site or backfilling Occasionally, the mortar fixing portion is easily cracked by the impact of the pipe or the buried soil, and water leakage or infiltration of groundwater is likely to occur after the burial. In addition, since mortar fixing is a manual operation, skill is required to completely stop water.
[0018]
In the prior art shown in FIG. 11, the outer peripheral surface of an elastic annular body 205 is bent and elastically expanded by a swelling watertight mechanism 206 instead of the mortar fixing portion 106 of FIG. The elastic annular member 205 is made of an elastic material such as rubber or resin into a ring shape.
[0019]
The elastic annular body 205 easily swells when the hardness is low, but the tube 203 easily sinks due to earth pressure or the like after embedding, and when it is hard, the tube 203 hardly sinks. .
[0020]
Based on such knowledge, the inventor prototyped and examined various pipe joints for manholes in order to obtain a manhole structure exhibiting stable watertightness without being affected by earth pressure after embedding.
[0021]
As a result, the present inventor has proposed that the drilling-side water stop portion and the sheath tube-side water stop portion of the predetermined water-stop joint be drilled between the rigid sheath tube and the manhole hole by the extension jig. The present inventors have found that a manhole structure exhibiting stable watertightness can be obtained by press-fitting and fixing to a sheath tube, and have reached the present invention.
[0022]
According to the present invention, by fixing a predetermined waterproofing joint to the sheath tube on the outer periphery of the tubular body and the bored portion of the manhole, without being affected by the borehole diameter of the manhole or the pipe diameter of the tubular body, A manhole structure exhibiting stable watertightness is obtained.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described.
(1) Manholes can be made of various materials and various shapes. Most of the manholes have a cylindrical shape, but may have a cylindrical shape such as a box culvert having a rectangular cross section. The drilled portion can be provided in various shapes by various methods.
[0024]
(2) It is arranged in the drilled portion of the tube manhole. It can be made of various materials and various shapes.
[0025]
(3) Connection between manhole and pipe The connection between the manhole and the pipe is usually a connection that connects a cylindrical pipe to a circular hole, but it is often a box culvert. A square drilled portion and a connection portion of a pipe are also included.
[0026]
(4) It has a rigidity that is larger than the diameter of the sheath tube and smaller than the diameter of the drilled portion of the manhole. It can be made of various materials and various shapes as long as the manhole water-proof joint and the flexible joint between the drilled portion and the tube can exhibit sufficient water-stop performance.
[0027]
(4) Water stop joint for manhole This is for stopping water between the sheath tube and the drilled portion, and is disposed radially outside the sheath tube. It can consist of a joint body and an expansion jig. The joint body includes a drilling-side water stopping portion provided in the drilling portion, a sheath tube-side water stopping portion provided in the sheath tube, and a water receiving pressure portion connecting the two water stopping portions.
[0028]
(4-1) A drilling-side compression portion provided to the drilling-side water stop portion drilling portion, and a drilling-side pressing plate for pressing and fixing the drilling-side compression portion to the drilling portion of the manhole. Can be. The drilling-side pressing plate may be arranged radially inside the drilling-side compression section.
[0029]
The drilling-side water stop portion may be a drilling-side pressing plate embedded as a core material in the drilling-side compression portion.
[0030]
Preferably, the drilling side pressing plate is divided in the circumferential direction. Such a divided drilling-side pressing plate is capable of sufficiently expanding the drilling-side water stop portion even when the outer diameter is smaller than the drilling-portion diameter, as compared with the integral annular drilling-side pressing plate. It is possible to sufficiently fix the drilling-side water stop portion to the drilled portion by pressure bonding.
[0031]
In the case of using a bolt as the expansion jig, the drilling-side water stopping portion may have a rotation bearing that receives the tip of the bolt and functions to freely rotate the bolt. The rotary bearing may be of various shapes as long as it can prevent the set position of the bolt that hits the hole-side pressing plate from being largely moved.
[0032]
(4-2) Sheath-tube-side water stopping portion The sheath-tube-side compression portion provided to the sheath-tube and a sheath-tube-side pressing plate that press-fits and fixes the sheath-tube-side compression portion to the sheath tube. Preferably, the sheath tube-side pressing plate is disposed radially outside of the sheath tube-side compression portion, and is similar to the drilling-side pressing plate, but in the circumferential direction for the reason of sufficiently reducing the diameter of the sheath tube-side water stopping portion. It is divided.
[0033]
When using a bolt as the expansion jig, the sheath tube-side water stopping portion is provided with a through-hole penetrating the bolt in the sheath tube-side compression portion, the sheath tube-side pressing portion, and the like.
[0034]
(4-3) The water receiving pressure section connects the water stop section on the drilling side and the water stop section on the sheath tube side. The water receiving pressure portion has a relationship such that the joint main body has a substantially U-shape when viewed in a cross-section due to the relationship between the drilling side water stop portion and the sheath tube side water stop portion. The water receiving pressure portion can have a cross-shaped shape, a wavy shape, a bellows shape, or the like in a sense that it can easily follow the displacement of the diameter of the sheath tube side compression portion and the hole-drilling side compression portion by the expansion jig. .
[0035]
(4-4) Expanding between the water stop portion on the drilling hole side and the water stop portion on the sheath tube side. By the expansion between the drilling-side water-stop portion and the sheath-tube-side water-stop portion by such an expansion jig, the drilling-side water-stop portion is pressure-fixed to the manhole-hole, and the sheath-tube-side water-stop portion is sheathed. It is fixed by crimping to the tube.
[0036]
The extension jig can be made of bolts. Such a bolt can penetrate the sheath tube, the sheath tube side compression part and the sheath tube side pressing plate, and can be screwed with the sheath tube side pressing plate. In addition, such a bolt can be screwed with a nut on a radially outer side of the sheath tube side pressing plate. Preferably, the nut is fixed to the sheath tube side pressing plate by welding or the like.
[0037]
The bolt as the expansion jig can have a head that does not penetrate through holes such as a sheath tube. By tightening the bolt or the nut, the head can further strengthen the close contact between the sheath tube and the sheath tube-side water blocking portion between the head and the nut or the sheath tube side pressing plate.
[0038]
(5) Flexible Joint There is no particular limitation, and a conventionally known flexible joint for stopping water between the sheath tube and the tubular body can be used.
[0039]
(6) Manhole pipe joint By combining the above-described waterhole joint for manhole, sheath pipe and flexible joint in advance and using it as a manhole pipe joint, a manhole structure exhibiting stable watertightness can be constructed.
[0040]
(7) Material of Water-stop Joint for Manhole and Flexible Joint The joint body and flexible joint of the water-stop joint for manhole can be made of an elastic material. The elastic body is at least one material selected from the group consisting of synthetic rubber such as styrene-butadiene rubber, EPDM, and CR, natural rubber, soft vinyl chloride resin, vinyl chloride-based elastomer, and styrene-based thermoplastic elastomer. Can consist of
[0041]
(8) Material of sheath tube, drilling side pressing plate, sheath tube side pressing plate, bolt and nut Rigid bodies such as sheath tube, drilling side pressing plate, sheath tube side pressing plate, nut and bolt are made of stainless steel, From at least one material selected from the group consisting of metals such as aluminum, rust-proof plated steel, rust-proof coated steel, hard plastics such as vinyl chloride resin, ABS resin, PET resin, and fiber-reinforced plastics such as FRP. Can be. Each of these materials is desirable because it hardly corrodes.
[0042]
(9) Manhole Structure Construction Method With the above-described manhole pipe joint, a manhole structure in which the drilled portion of the manhole and the pipe are connected in a watertight manner can be constructed as follows.
[0043]
In constructing the manhole structure, first, the above-described manhole pipe joint is prepared. Such a pipe joint for manholes can be composed of a combination of a watertight joint for manholes, a sheath tube, and a flexible joint as described above. Next, if such a pipe joint for manholes is used so as to include the following steps, a manhole structure exhibiting stable watertightness can be constructed.
[0044]
Fixing the flexible joint to the inside of the sheath tube in the radial direction, arranging the water-stop joint to the outside of the sheath tube in the radial direction, and placing the expansion jig between the drilling-side water stop portion and the sheath tube-side water stop portion. Disposing and crimp-fixing the drilling-side water stopping portion to the drilling portion and crimp-fixing the sheath tube-side water stopping portion to the sheath tube by expanding the expansion jig.
[0045]
When the expansion jig is composed of a bolt, such an expansion jig allows the bolt to penetrate the sheath tube, the sheath tube side compression portion and the sheath tube side pressing plate, and at least the sheath tube side pressing plate or the sheath tube side pressing plate. By screwing with the nut on the outer side in the radial direction, the drilling-side water stopping portion and the sheath tube-side water stopping portion of the joint main body can be expanded in diameter, and these can be crimped and fixed to the hole cutting portion and the sheath tube.
[0046]
In the screwing of the bolt and the sheath tube side pressing plate, by turning the bolt, the diameter of the drilling side water stopping portion and the sheath tube side water stopping portion of the joint body can be increased. In the screwing of the bolt and the nut, by rotating at least one of the bolt and the nut, it is possible to enlarge the diameter of the drilling water stop portion and the sheath tube water stop portion of the joint body.
[0047]
The present invention will be described in further detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an attached state of a watertight joint for manholes according to an example of the present invention. FIG. 2 is a cross-sectional view of the watertight joint for manholes of FIG. FIG. 3 is an enlarged view of the watertight joint for manholes in FIG. 1. FIG. 4 is a front view of the watertight joint for manholes of FIG. 1 as viewed from the inside of the manhole. FIG. 5 is a perspective view showing part A of FIG. 4 in detail.
[0048]
FIG. 6A is a front view of the joint main body of the manhole waterproof joint of FIG. 1, and FIG. 6B is a plan view of the joint main body of the manhole waterproof joint of FIG. 1. FIG. 7 is a perspective view showing the drilling side pressing plate, the sheath tube side pressing plate and the bolts of FIG.
[0049]
FIG. 8 is a plan view of the sheath tube of FIG. 1 as viewed from above the manhole. FIG. 9 (a) is a longitudinal sectional view before the manhole waterproof joint of FIG. 1 is expanded. FIG. 9B is a longitudinal sectional view showing a mechanism in which the drilling-side water stop portion of the watertight joint for manholes in FIG. 1 is fixed to the drilled surface by pressure bonding. FIG. 9C is a vertical cross-sectional view showing a mechanism in which the sheath-tube-side water-stop portion of the watertight joint for manholes of FIG. 1 is fixed to the sheath tube by crimping.
[0050]
As shown in FIGS. 1 to 5, the watertight joint 1 for manholes according to one embodiment of the present invention has a diameter larger than the diameter of the pipe body 3 arranged in the hole 2 a of the manhole 2 and smaller than the diameter of the hole 2 a. Water between the rigid sheath tube 4 and the drilled portion 2a. The watertight joint 1 for manholes can be used as a pipe joint 6 for manholes together with the sheath pipe 4 and the flexible joint 5 to obtain a manhole structure 7 exhibiting stable watertightness.
[0051]
As shown in detail in FIG. 3, the watertight joint 1 for manholes includes a joint body 8 and an expansion jig 9, and the joint body 8 includes a drilling-side waterstop portion 8a provided in the manhole drilling portion 2a. And a water receiving pressure portion 8c that connects the water stopping portions to each other. The expansion jig 9 extends between the drilling-side water stopping portion 8a and the sheath tube-side water stopping portion 8b.
[0052]
As shown in FIGS. 1, 2, 4, and 5, the watertight joint 1 for manholes is disposed radially outside the sheath tube 4, and the drilling-side waterstop portion 8 a and the sheath tube are formed by the expansion jig 9. The gap between the side water blocking portions 8b is expanded, the drilling-side water blocking portion 8a is fixed to the drilling portion 2a by pressure bonding, and the sheath tube side water blocking portion 8b is fixed to the sheath tube 4 by pressure bonding, so that stable watertightness is achieved. Is obtained. A sufficient watertight state can be maintained between the tube 3 and the sheath tube 4 by the flexible joint 5.
[0053]
As shown in detail in FIGS. 3, 6 (a) and (b), the joint body 8 of the watertight joint for manholes 1 has a drilling side water stopping portion 8a which is provided in the drilling portion 2a. Side compression portion 8d, and a drilling side pressing plate 8e disposed radially inward of the drilling side compression portion 8d and pressing and fixing the drilling side compression portion 8d to the drilling portion 2a. 8b is a sheath tube side compression portion 8f provided on the sheath tube 4, and a sheath tube side pressing plate which is arranged radially outside the sheath tube side compression portion 8f and presses and fixes the sheath tube side compression portion 8f to the sheath tube 4. 8 g.
[0054]
The drilling side compression part 8d and the drilling side pressing plate 8e, and the sheath tube side compression part 8f and the sheath tube side pressing plate 8g may be bonded in advance. Further, the drilling-side pressing plate or the sheath tube-side pressing plate may be embedded as a core material in the drilling-side compression portion or the sheath tube-side compression portion to form a drilling-side water stopping portion or a sheath tube-side water stopping portion.
[0055]
Water stop projections 8h and 8i can be provided on the radially outer side of the drilling-side compressed portion 8d and on the radially inner side of the sheath tube-side compressed portion 8f. The shape of these water stop projections 8h and 8i can be considered according to the required compression amount. Further, the joint body 8 can have a flange portion 8j shaped along the outer peripheral surface of the manhole drilling portion 2a.
[0056]
As shown in detail in FIGS. 3, 5, 8 and 9 (a) to 9 (c), the expansion jig 9 can be made of a bolt. In addition, as shown in FIGS. 7 and 8, this bolt passes through the through-hole 10 of the sheath tube 4, the sheath tube side compression portion 8f, and the sheath tube side pressing plate 8g, and is screwed with the sheath tube side pressing plate 8g. It may be screwed together with a nut 12 fixed by a nut fixing part 11 such as welding outside the sheath tube side pressing plate 8g in the radial direction.
[0057]
A rotary bearing 13 can be provided on the drilling-side pressing plate 8e. The rotation bearing 13 receives the tip of the bolt as the expansion jig 9 and functions to freely rotate the bolt. The rotary bearing 13 may have any other shape as long as the setting position of the hole-side pressing plate 8e can be prevented from largely moving.
[0058]
As shown in detail in FIGS. 4, 5, and 8, the drilling side pressing plate 8e and the sheath tube side pressing plate 8g can be divided in the circumferential direction. The number of divisions of these pressing plates can be set arbitrarily according to the hole diameter, the required compressive strength at both water stopping portions of the water stopping joint, and the like. In FIG. 5, the space between the divided drilling-side pressing plate 8e and the sheath tube-side pressing plate 8g is extended by three bolts, but the number of bolts depends on the number of pressing plate divisions and water stoppage. It can be arbitrarily determined according to the required compressive strength of the part.
[0059]
As shown in FIGS. 1 and 2, the cylindrical flexible joint 5 has one end fixed to the radially inner surface of the sheath tube 4, and one end fixed to the radially outer surface of the sheath tube 4. Alternatively, the other end may be fixedly attached to the tube 3. Further, as a flexible joint for stopping water between the sheath tube and the tube body, a flexible joint such as a rubber waterproof ring may be used.
[0060]
The construction method of the manhole structure will be more apparent with reference to the drawings.
In order to construct the manhole structure of the present invention, as shown in FIGS. A manhole water stop joint in which a divided drilling-side pressing plate 8e and a sheath tube-side pressing plate 8g are arranged inside a U-shape of a joint main body 8 composed of a water receiving pressure portion 8c connecting them. 1 can be used. Further, such a watertight joint 1 for manholes can be used as a manhole pipe joint 6 integrally with the sheath tube 4 and the flexible joint 5 for manholes.
[0061]
The manhole structure 7 in the mounted state as shown in FIGS. 1, 2 and 4 is provided between the manhole side end of the sheath tube 4 and the manhole drilling portion 2a within the wall thickness width of the drilling portion 2a. The watertight joint 1 is set, and a bolt as the expansion jig 9 of the watertight joint for manhole 1 is passed through the through hole 10 of the sheath tube 4 and the sheath tube side waterproof portion 8b from inside the manhole 2. The pipe joint 3 is attached to the hole 7 by rotating the screw. The flexible joint 5 is set in advance on the outside of the manhole between the sheath tube 4 and the tube 3 so as not to hit the watertight joint 1 for manhole.
[0062]
Generally, this process is performed at the manhole maker's factory, but there is no problem with installation at the construction site.
[0063]
9 (a) to 9 (c), a bolt as an expansion jig expands between the drilling-side water stop portion and the sheath tube-side water stop portion of the waterhole joint for manholes, and drilling side stop. The mechanism for pressing and fixing the water part and the sheath tube side water stopping part to the drilled part of the manhole and the sheath pipe will be described in further detail.
[0064]
The bolt as the expansion jig 9 passes through the through-hole 10 coaxially formed in the sheath tube 4, the sheath tube side compression portion 8f and the sheath tube side pressing plate 8g, reaches the nut 12, and is cut by the screw rotation of the bolt. It is provided on the hole-side pressing plate 8e.
[0065]
The watertight joint 1 for manholes shown in FIGS. 3 and 9 (a) is set between the drilled portion 2a of the manhole 2 and the sheath tube 4, and as shown in FIGS. 9 (b) and 9 (c), By rotating the bolt as the expansion jig 9, the space between the drilling side pressing plate 8e and the sheath tube side pressing plate 8g can be expanded.
[0066]
In FIG. 9B, the watertight joint for manhole 1 is disposed between the hole 2 a of the manhole 2 and the sheath tube 4, and the hole-side pressing plate 8 e is rotated by rotation of a bolt as the expansion jig 9. By being pressed in the direction of the drilling portion 2a on the outer side in the radial direction, the water stopping projection 8h of the drilling side compression portion 8d is compressed and deformed.
[0067]
FIG. 9C shows a state in which the bolt is further rotated from the state of FIG. 9B, and the tip of the bolt is stopped by the rotary bearing 13 of the drilling-side pressing plate 8e, and further rotated. , The nut 12 and the sheath tube-side pressing plate 8g are pressed in the radially inner direction toward the sheath tube 4, the water-stopping projections 8i of the sheath tube-side compression portion 8f are compressed and deformed, and the drilled portion 2a and the sheath tube Water can be stopped between 4 and.
[0068]
In the manhole structure constructed in this manner, between the pipe inserted into the drilled portion and the drilled portion, water is stopped by a flexible joint between the pipe and the sheath tube, and the sheath tube and the drill hole are drilled. The water is stopped in a stable state between the portions by the cut-off portion-side water stop portion and the sheath tube-side water stop portion of the manhole water stop joint.
[0069]
In such a manhole structure, even if the center axis of the manhole drilling portion and the central axis of the sheath tube are deviated and the interval between the drilling portion and the sheath tube is not uniform, the watertight joint for manhole drilling is performed. Between the sheath tube and the sheath tube with sufficient watertightness.
[0070]
In the embodiment of the present invention shown in the drawings, an example in which a cylindrical pipe body is connected to a circular drilled portion is shown, but the watertight joint for a manhole of the present invention is a square drilled hole such as a box culvert. It is also applicable to parts and pipes.
[0071]
【The invention's effect】
As apparent from the above description, according to the present invention, a rigid sheath tube is interposed between the manhole drilling portion and the pipe, and a predetermined manhole water stoppage is provided between the sheath tube and the drilling portion. The drilling-side water-stop portion and the sheath-tube-side water-stop portion of the joint are expanded by the expansion jig and fixed to the drilled portion and the sheath tube by crimping, so that the flexible joint between the sheath tube and the tube is stopped. The manhole structure obtained by water can maintain stable watertightness without being affected by the diameter of the drilled portion of the manhole or the diameter of the pipe.
[0072]
In particular, according to the present invention, the drilling-side water-stop portion and the sheath-tube-side water-stop portion of the watertight joint for manholes are formed in the hole by the expansion jig between the drilling-side pressing plate and the sheath-tube-side pressing plate. The watertight joint for manholes is easy and does not require skill, so it can be fixed securely by crimping so that it fits the peripheral surface and the outer surface of the pipe. Sufficient flexibility and water stoppage can be imparted.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an attached state of a waterhole joint for manholes according to an example of the present invention.
FIG. 2 is a cross-sectional view of the water blocking joint for manholes of FIG. 1;
FIG. 3 is an enlarged view of the watertight joint for manholes of FIG. 1;
FIG. 4 is a front view of the watertight joint for manholes of FIG. 1 from the inside of the manhole.
FIG. 5 is a perspective view showing part A of FIG. 4 in detail.
6 (a) is a front view of a joint main body of the manhole waterproof joint of FIG. 1, and FIG. 6 (b) is a plan view of a joint main body of the manhole waterproof joint of FIG.
FIG. 7 is a perspective view showing a drilling side pressing plate, a sheath tube side pressing plate and a bolt of FIG. 1;
FIG. 8 is a plan view of the sheath tube of FIG. 1 as viewed from above the manhole.
9 (a) is a longitudinal sectional view of the watertight joint for manholes of FIG. 1 before being expanded, and FIG. 9 (b) is a hole-cutting water-stop portion of the watertight joint for manholes of FIG. 1; It is a longitudinal cross-sectional view which shows the mechanism which is crimped and fixed to a surface, (c) is a longitudinal cross-sectional view which shows the mechanism by which the sheath tube side water stopping part of the watertight joint for manholes of FIG. 1 is crimped and fixed to a sheath tube. .
10A is a cross-sectional view of a conventional joint mechanism, and FIG. 10B is a vertical sectional view of the conventional joint mechanism.
FIG. 11 is a longitudinal sectional view of a conventional flexible joint for manholes.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water-stopping joint for manholes 2 Manhole 2a Drilled part 3 Pipe 4 Sheath tube 5 Flexible joint 6 Pipe joint for manhole 7 Manhole structure 8 Joint main body 8a Drilling side water stopping part 8b Sheath tube side water stopping part 8c Water receiving pressure Part 8d Drilling side compression part 8e Drilling side pressing plate 8f Sheath tube side compression part 8g Sheath tube side pressing plate 8h, 8i Water stop projection 8j Flange part 9 Extension jig 10 Through hole 11 Nut fixing part 12 Nut 13 Rotation bearing 101 Joint Mechanism 102 Buried Structure 102a Connection Port 103 Pipe End 104 Cylindrical Ring Material 105 Cylindrical Packing 106 Filled Coagulant 201 Joint 202 Manhole Body 202a Inner Peripheral Surface of Connection Hole 203 Connection Tube 204 Cylindrical Connection Body 205 Elastic annular body 206 bulging watertight mechanism

Claims

マンホールの削孔部内に配置される管体より大径で前記削孔部径より小径の剛性の鞘管と、前記削孔部との間を止水するためのマンホール用止水継手であって、
前記削孔部に当設する削孔側止水部と、前記鞘管に当設する鞘管側止水部と、両止水部を繋ぐ受水圧部とを具える継手本体、及び前記削孔側止水部及び前記鞘管側止水部の間を拡張する拡張治具を備えており、前記鞘管の半径方向外側に配置され、前記拡張治具による前記削孔側止水部及び前記鞘管側止水部の間の拡張によって、前記削孔側止水部が前記削孔部に圧着固定され、かつ前記鞘管側止水部が前記鞘管に圧着固定されることを特徴とするマンホール用止水継手。A watertight joint for manholes for stopping water between the sheath tube having a diameter larger than the diameter of the pipe body disposed in the hole portion of the manhole and smaller than the diameter of the hole portion, and water between the hole portion. ,
A joint body including a drilling-side water stopping portion provided in the drilling portion, a sheath tube-side water stopping portion provided in the sheath tube, and a water receiving pressure portion connecting the two water stopping portions; An expansion jig is provided to extend between the hole-side water stop portion and the sheath tube-side water stop portion, and is disposed radially outside the sheath tube, and the drilling-side water stop portion by the expansion jig and By the expansion between the sheath tube-side water stopping portions, the drilling-side water stopping portion is fixed to the hole by crimping, and the sheath tube-side water stopping portion is fixed to the sheath tube by crimping. Water stop fittings for manholes.

前記削孔側止水部が、前記削孔部に当設する削孔側圧縮部と、前記削孔側圧縮部の半径方向内側に配置され前記削孔側圧縮部を前記削孔部に圧着固定させる削孔側押圧板とからなり、前記鞘管側止水部が、前記鞘管に当設する鞘管側圧縮部と、前記鞘管側圧縮部の半径方向外側に配置され前記鞘管側圧縮部を前記鞘管に圧着固定させる鞘管側押圧板とからなる請求項１記載のマンホール用止水継手。The drilling-side water stopping portion is disposed radially inside the drilling-side compression portion and the drilling-side compression portion provided in contact with the drilling portion, and press-bonds the drilling-side compression portion to the drilling portion. A borehole-side pressing plate to be fixed, wherein the sheath tube-side water blocking portion is disposed radially outside of the sheath tube-side compression portion provided on the sheath tube, and the sheath tube The watertight joint for manholes according to claim 1, comprising a sheath tube-side pressing plate that press-fits a side compression portion to the sheath tube.

前記拡張治具がボルトからなり、前記ボルトが、前記鞘管、前記鞘管側圧縮部及び前記鞘管側押圧板を貫通し、前記鞘管側押圧板が前記ボルトと螺合する請求項２記載のマンホール用止水継手。The said expansion jig consists of a bolt, The said bolt penetrates the said sheath tube, the said sheath tube side compression part, and the said sheath tube side press plate, The said sheath tube side press plate is screwed with the said bolt. The watertight fitting for a manhole described.

前記拡張治具がボルトからなり、前記ボルトが、前記鞘管、前記鞘管側圧縮部及び前記鞘管側押圧板を貫通し、前記鞘管側押圧板にナットが固定されており、前記ナットが前記ボルトと螺合する請求項２又は３記載のマンホール用止水継手。The expansion jig is composed of a bolt, the bolt penetrates the sheath tube, the sheath tube side compression part and the sheath tube side pressing plate, and a nut is fixed to the sheath tube side pressing plate. The watertight joint for manholes according to claim 2 or 3, wherein a screw is engaged with the bolt.

前記削孔側押圧板及び前記鞘管側押圧板が周方向で分断されている請求項１〜４のいずれか一項記載のマンホール用止水継手。The watertight joint for manholes according to any one of claims 1 to 4, wherein the drilling side pressing plate and the sheath tube side pressing plate are separated in a circumferential direction.

マンホールの削孔部と管体とを接続する管継手であって、前記削孔部内に配置される前記管体より大径で前記削孔部径より小径の剛性の鞘管と、前記鞘管及び前記削孔部の間を止水するための止水継手と、前記鞘管及び前記管体の間を止水するための可とう継手とを具えるマンホール用管継手であって、
前記止水継手が、前記削孔部に当設する削孔側止水部と、前記鞘管に当設する鞘管側止水部と、両止水部を繋ぐ受水圧部とを具える継手本体、及び前記削孔側止水部及び前記鞘管側止水部の間を拡張する拡張治具を備えており、前記可とう継手が前記鞘管の半径方向内側に配置され、前記止水継手が前記鞘管の半径方向外側に配置され、前記拡張治具による前記削孔側止水部及び前記鞘管側止水部の間の拡張によって、前記削孔側止水部が前記削孔部に圧着固定され、かつ前記鞘管側止水部が前記鞘管に圧着固定されることを特徴とするマンホール用管継手。A pipe joint for connecting a drilled portion of a manhole and a pipe body, wherein the sheath tube has a larger diameter than the pipe body disposed in the drilled portion and a smaller diameter than the drilled portion diameter; And a water stop joint for stopping water between the drilled portions, and a manhole pipe joint comprising a flexible joint for stopping water between the sheath tube and the pipe body,
The water stopping joint includes a drilling-side water stopping portion provided at the drilling portion, a sheath tube-side water stopping portion provided at the sheath tube, and a water receiving pressure portion connecting both water stopping portions. A joint body, and an expansion jig for expanding between the drilling-side water stopping portion and the sheath tube-side water stopping portion, wherein the flexible joint is disposed radially inward of the sheath tube; A water joint is disposed radially outside the sheath tube, and the drilling-side water stop portion is cut by the expansion jig between the hole-stop water stop portion and the sheath tube-side water stop portion. A pipe joint for manholes, wherein the pipe joint is crimped and fixed to a hole, and the sheath tube-side water stopping portion is crimped and fixed to the sheath pipe.

マンホールの削孔部と管体とがマンホール用管継手によって接続されているマンホール構造であって、
前記マンホール用管継手が、前記削孔部内に配置される前記管体より大径で前記削孔部径より小径の剛性の鞘管と、前記鞘管及び前記削孔部の間を止水するための止水継手と、前記鞘管及び前記管体の間を止水するための可とう継手とを具えており、前記止水継手が、前記削孔部に当設する削孔側止水部と、前記鞘管に当設する鞘管側止水部と、両止水部を繋ぐ受水圧部とを具える継手本体、及び前記削孔側止水部及び前記鞘管側止水部の間を拡張する拡張治具を備えており、前記可とう継手が前記鞘管の半径方向内側に配置されており、前記止水継手が前記鞘管の半径方向外側に配置されており、前記拡張治具による前記削孔側止水部及び前記鞘管側止水部の間の拡張によって、前記削孔側止水部が前記削孔部に圧着固定されており、かつ前記鞘管側止水部が前記鞘管に圧着固定されていることを特徴とするマンホール構造。A manhole structure in which the drilled portion of the manhole and the pipe are connected by a manhole fitting,
The pipe joint for manholes has a rigid sheath tube having a diameter larger than the diameter of the pipe body arranged in the drilled portion and smaller than the diameter of the drilled portion, and blocks water between the sheath tube and the drilled portion. And a flexible joint for stopping water between the sheath tube and the tubular body, wherein the water-stopping joint is provided on the drilling-side water stop provided in the drilling portion. Body, a joint body including a sheath pipe-side water stopping portion provided on the sheath tube, and a water receiving pressure portion connecting the two water stopping portions, and the drilling side water stopping portion and the sheath tube side water stopping portion. An expansion jig for expanding the space between the flexible tube and the flexible joint is disposed radially inward of the sheath tube; the water-stop joint is disposed radially outside of the sheath tube; By drilling between the drilling-side water-stop portion and the sheath tube-side water-stop portion by an expansion jig, the drilling-side water-stop portion is crimp-fixed to the drilling portion, and Manhole structure characterized in that Kisaya pipe side waterproof part is crimped to the sheath pipe.

マンホールの削孔部と管体とがマンホール用管継手によって接続されているマンホール構造を施工するにあたり、
マンホール用管継手を準備し、前記マンホール用管継手が、前記削孔部内に配置される前記管体より大径で前記削孔部径より小径の剛性の鞘管と、前記鞘管及び前記削孔部の間を止水する止水継手と、前記鞘管及び前記管体の間を止水する可とう継手を具えており、前記止水継手が、前記削孔部に当設する削孔側止水部と、前記鞘管に当設する鞘管側止水部と、両止水部を繋ぐ受水圧部とを具える継手本体、及び前記削孔側止水部及び前記鞘管側止水部の間を拡張する拡張治具とを備えており、
前記可とう継手を前記鞘管の半径方向内側に固定し、
前記止水継手を前記鞘管の半径方向外側に配置し、
前記拡張治具を前記削孔側止水部及び前記鞘管側止水部の間に配置し、
前記拡張治具の拡張によって、前記削孔側止水部を前記削孔部に圧着固定するとともに前記鞘管側止水部を前記鞘管に圧着固定すること
を含むことを特徴とするマンホール構造の施工方法。In constructing a manhole structure in which the drilled part of the manhole and the pipe are connected by a manhole fitting,
A pipe joint for manholes is prepared, and the pipe joint for manholes has a rigid sheath pipe having a diameter larger than the diameter of the pipe body disposed in the hole and smaller than the diameter of the hole. A water-stop joint for stopping water between the holes, and a flexible joint for stopping water between the sheath tube and the pipe body, wherein the water-stop joint is provided in the hole for drilling. A joint body including a side water stop portion, a sheath tube side water stop portion provided on the sheath tube, and a water receiving pressure portion connecting the two water stop portions, and the drilling side water stop portion and the sheath tube side. With an expansion jig that expands between the water stop sections,
Securing the flexible joint radially inward of the sheath tube;
Disposing the water stop fitting radially outside the sheath tube;
The expansion jig is disposed between the drilling-side water stopping portion and the sheath tube-side water stopping portion,
A manhole structure, comprising: crimping and fixing the drilling-side water stopping portion to the drilling portion by expanding the expansion jig, and crimping and fixing the sheath tube-side water stopping portion to the sheath tube. Construction method.