JP6779501B2 - Flexible joint with telescopic function - Google Patents

Flexible joint with telescopic function Download PDF

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JP6779501B2
JP6779501B2 JP2017078100A JP2017078100A JP6779501B2 JP 6779501 B2 JP6779501 B2 JP 6779501B2 JP 2017078100 A JP2017078100 A JP 2017078100A JP 2017078100 A JP2017078100 A JP 2017078100A JP 6779501 B2 JP6779501 B2 JP 6779501B2
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pipe
succeeding
flexible joint
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勝彦 吉本
勝彦 吉本
和明 栗本
和明 栗本
幸広 戸頃
幸広 戸頃
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藤村クレスト株式会社
中日本建設コンサルタント株式会社
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Description

本発明は、耐震性に優れた管渠（函渠）を構築するための伸縮機能付き可撓継手に関する。 The present invention relates to a flexible joint with an expansion / contraction function for constructing a pipe (box) having excellent seismic resistance.

管渠（函渠）は、地盤の沈下・変形、さらには地震に伴う動的変位・液状化または過剰間隙水圧の上昇によって大きな地盤変位の影響を受ける。このため、例えば特許文献１や特許文献２に示すような継手構造によってその変形を吸収する方法が取られている。 Pipes (Hakodori) are affected by large ground displacement due to ground subsidence / deformation, dynamic displacement / liquefaction due to earthquakes, or increase in excess pore water pressure. Therefore, for example, a method of absorbing the deformation by a joint structure as shown in Patent Document 1 and Patent Document 2 is adopted.

特許文献１に示す発明は、ボックスカルバート２どうしを４本のＰＣ鋼棒６によって連結すると共に、各ボックスカルバート２間の継手部（連結部３）に設けられているアーチ部７ａと直線部７ｂを備えた止水部７が継手部（連結部３）を塞いで止水しており、継手部に変位が起こると、止水部７の直線部７ｂが切れてアーチ部７ａが変形することにより、ボックスカルバート２の設置位置の変位に追従すると共に、アーチ部７ａでの継手部（連結部３）の止水性を維持するというものである。 In the invention shown in Patent Document 1, the box displacements 2 are connected to each other by four PC steel rods 6, and the arch portion 7a and the straight portion 7b provided at the joint portion (connecting portion 3) between the box displacements 2 are connected. The water stop portion 7 provided with the above blocks the joint portion (connecting portion 3) to stop water, and when the joint portion is displaced, the straight portion 7b of the water stop portion 7 is cut and the arch portion 7a is deformed. As a result, the displacement of the installation position of the box culvert 2 is followed, and the water stoppage of the joint portion (connecting portion 3) at the arch portion 7a is maintained.

また特許文献２に示す発明は、連設された２個の函渠１２の壁部間に緊張材２，２をＸ字状に張設させる構成である。緊張材２，２が函軸方向バネ及び剪断バネとして働くことになり、函渠１２は、軟弱地盤での大きな圧密沈下や側方変位、あるいは地震時の液状化に伴う大きな地盤変位に耐えるというものである。 Further, the invention shown in Patent Document 2 has a configuration in which tension members 2 and 2 are stretched in an X shape between the walls of two consecutive culverts 12. The tension members 2 and 2 act as a box axial spring and a shear spring, and the culvert 12 is said to withstand large consolidation settlement and lateral displacement on soft ground, or large ground displacement due to liquefaction during an earthquake. It is a thing.

特開平９−６００９９号公報Japanese Unexamined Patent Publication No. 9-60099 特開２００１−３０３６５３号公報Japanese Unexamined Patent Publication No. 2001-303653

しかし、上記特許文献１に記載のものではアーチ部７ａが変形可能な範囲は、精々２０〜３０ｃｍ程度であり、それ以上の大きな地盤変位に追従して変位することは不可能である。特に、複数のＰＣ鋼棒６は径寸法が比較的小さなシース管９内に配置されており、管軸に対して直交する方向へ変形が生じた場合には、ＰＣ鋼棒６がシース管９に当接してその変位が制限されることから、地盤変位に追従して変位するということは不可能となるので管渠（函渠）の機能を維持することは極めて難しいという問題がある。 However, in the case described in Patent Document 1, the range in which the arch portion 7a can be deformed is at most about 20 to 30 cm, and it is impossible to displace it following a larger ground displacement. In particular, a plurality of PC steel rods 6 are arranged in a sheath pipe 9 having a relatively small diameter, and when deformation occurs in a direction orthogonal to the pipe axis, the PC steel rod 6 is placed in the sheath pipe 9 Since the displacement is limited by contacting the pipe, it is impossible to displace following the ground displacement, and there is a problem that it is extremely difficult to maintain the function of the pipe (box).

また上記特許文献２に記載のものではＸ字状に張設された緊張材２，２により、地盤変位に起因する各管渠（函渠）どうし継手部の位置ずれを強制的に抑え込むだけの構成であり、想定以上の大きな地盤変位が起きて継手部に目開きが発生した場合には、管渠(函渠)から外部への漏水と共に土砂の流入により管渠(函渠)が閉塞されてしまうことへの対応には不十分であるという問題がある。 Further, in the case described in Patent Document 2, the tension members 2 and 2 stretched in an X shape only forcibly suppress the misalignment of the joints between the pipes (boxes) due to the ground displacement. It is a configuration, and if a ground displacement larger than expected occurs and a joint part opens, the pipe (box) is blocked by the inflow of earth and sand as well as water leaking from the pipe (box) to the outside. There is a problem that it is not enough to deal with the situation.

本発明は、上記した従来技術における問題点を解消すべく、管渠（函渠）間を連結する継手部に目開きが起きても、従来以上に大きな変位量を有して追従することにより、管渠（函渠）としての機能を維持することを可能とした伸縮機能付き可撓継手を創出することを課題とする。 In the present invention, in order to solve the above-mentioned problems in the prior art, even if a joint portion connecting pipes (boxes) is opened, the joint portion is followed with a larger displacement amount than before. An object of the present invention is to create a flexible joint with an expansion / contraction function that can maintain the function as a pipe (box).

上記課題を解決するための手段のうち、本発明の主たる手段は、
連結された管渠間の継手部に配置される伸縮機能付き可撓継手であって、
外管と外管内に挿入された内管とが互いに管軸方向に相対的に移動可能に設けられた二重管と、内管に連結部を介して連結された後続管とを有し、連結された一方の管渠内に外管が固定され、他方の管渠内に後続管が固定されていることを特徴とする、と云うものである。 Among the means for solving the above problems, the main means of the present invention is
It is a flexible joint with a telescopic function that is placed at the joint between the connected pipes.
It has a double pipe in which the outer pipe and the inner pipe inserted into the outer pipe are provided so as to be relatively movable in the direction of the pipe axis, and a succeeding pipe connected to the inner pipe via a connecting portion. It is characterized in that the outer pipe is fixed in one of the connected pipes and the succeeding pipe is fixed in the other pipe.

本発明の主たる手段では、地震等により管渠間の継手部に目開きが起きても、その目開きに追従して内管と後続管の連結部が管軸に対して水平方向及び垂直方向の変位に対応し、二重管が管軸方向の変位に対応し得る。 In the main means of the present invention, even if a joint portion between pipes is opened due to an earthquake or the like, the connecting portion between the inner pipe and the succeeding pipe follows the opening in the horizontal and vertical directions with respect to the pipe axis. The double pipe can correspond to the displacement in the pipe axis direction.

また本発明の他の手段は、主たる手段に、連結部は、内管側に設けられたカラー部の内側に、後続管の差込み口が挿入される構成である、との手段を加えたものである。 Further, another means of the present invention is obtained by adding a means to the main means that the connecting portion is configured such that the insertion port of the succeeding pipe is inserted inside the collar portion provided on the inner pipe side. Is.

上記手段では、ヒンジ機能による屈曲が可能となることから、管軸に対して水平方向及び垂直方向に作用する変位を吸収し得る。 Since the above means can be bent by the hinge function, it can absorb the displacement acting in the horizontal direction and the vertical direction with respect to the pipe axis.

また本発明の他の手段は、上記いずれかの手段に、内管と後続管とが、両者の間に架設された緊結プレートを介して連結されている、との手段を加えたものである。 Further, another means of the present invention is obtained by adding a means that the inner pipe and the succeeding pipe are connected via a binding plate erected between the inner pipe and the succeeding pipe to any of the above means. ..

上記手段では、内管から後続管が脱落することを防止し得ると共に、二重管の内管が緊結プレートを介して後続管に追従して抜け出すことを達成し得る。 With the above means, it is possible to prevent the succeeding pipe from falling out from the inner pipe, and it is possible to achieve that the inner pipe of the double pipe follows the succeeding pipe through the binding plate and exits.

また本発明の他の手段は、上記いずれかの手段に、一方の管渠の内壁と外管との間及び他方の管渠の内壁と後続管との間に、充填材が充填されている、との手段を加えたものである。 Further, in the other means of the present invention, any of the above means is filled with a filler between the inner wall and the outer pipe of one pipe and between the inner wall and the succeeding pipe of the other pipe. , And the means are added.

上記手段では、外管及び後続管を管渠（函渠）内に固定することができると共に、既設の管渠（函渠）を補強することができる。 In the above means, the outer pipe and the succeeding pipe can be fixed in the pipe (box), and the existing pipe (box) can be reinforced.

また本発明の他の手段は、上記いずれかの手段に、管渠が、円筒形状、箱型形状又は馬蹄形状である、との手段を加えたものである。 Further, another means of the present invention is obtained by adding a means that the pipe has a cylindrical shape, a box shape, or a horseshoe shape in addition to any of the above means.

上記手段では、様々な管渠（函渠）に対して耐震性に優れた伸縮機能付き可撓継手とし得る。 With the above means, a flexible joint with an expansion / contraction function having excellent seismic resistance can be obtained for various pipes (boxes).

また本発明の他の手段は、上記いずれかの手段に、二重管及び後続管が、円筒形状、箱型形状又は馬蹄形状である、との手段を加えたものである。 Further, another means of the present invention is obtained by adding a means that the double pipe and the succeeding pipe have a cylindrical shape, a box shape or a horseshoe shape in addition to any of the above means.

上記手段では、様々な形状からなる二重管及び後続管を使用して耐震性に優れた伸縮機能付き可撓継手を構築し得る。 In the above means, a flexible joint having an expansion / contraction function having excellent seismic resistance can be constructed by using a double pipe and a succeeding pipe having various shapes.

本発明は、上記した構成となっているので、以下に示す効果を奏する。
本発明の伸縮機能付き可撓継手では、管渠（函渠）の継手部の目開きに合わせて、管渠（函渠）の内側にて連結された二重管を構成する内管と後続管との連結部が水平方向及び鉛直方向の変位に追従して屈曲することができる。
また二重管を構成する内管と後続管とは緊結プレートを介して連結されているため、地震等の地盤変位の際には内管が後続管に追従して外管内を移動してその外部に抜け出ることができる。加えて、地震等によって後続管が内管から脱落することを効果的に防止することができ、結果として土砂流入による管渠（函渠）の閉塞を防止し、例えば上下水道の流下機能、あるいは地下通路や共同溝などの空間利用としての機能を維持することができる。 Since the present invention has the above-described configuration, the following effects are obtained.
In the flexible joint with the expansion / contraction function of the present invention, the inner pipe and the subsequent pipe forming a double pipe connected inside the pipe (box) according to the opening of the joint portion of the pipe (box). The connecting portion with the pipe can be bent following the displacement in the horizontal direction and the vertical direction.
In addition, since the inner pipe and the succeeding pipe that make up the double pipe are connected via a binding plate, the inner pipe follows the succeeding pipe and moves inside the outer pipe in the event of ground displacement such as an earthquake. You can get out. In addition, it is possible to effectively prevent the following pipes from falling off from the inner pipes due to an earthquake or the like, and as a result, it is possible to prevent the pipes (utility tunnels) from being blocked due to the inflow of earth and sand. It is possible to maintain the function of using space such as underground passages and utility tunnels.

本発明を構成する二重管の一方である外管を示し、Ａは縦断面図、ＢはＡのａ−ａ線における断面図である。An outer pipe, which is one of the double pipes constituting the present invention, is shown, where A is a vertical cross-sectional view and B is a cross-sectional view taken along the line aa of A. 本発明を構成する二重管の他方である内管を示し、Ａは縦断面図、ＢはＡのｂ−ｂ線における断面図である。The inner pipe which is the other of the double pipes constituting the present invention is shown, where A is a vertical sectional view and B is a sectional view taken along line bb of A. 本発明を構成する後続管を示し、Ａは半断面図、ＢはＡのｃ−ｃ線における断面図である。The following pipes constituting the present invention are shown, where A is a half cross-sectional view and B is a cross-sectional view taken along the line cc of A. 本発明の伸縮機能付き可撓継手を構成として、二重管に後続管を連結させた状態を示す断面図である。It is sectional drawing which shows the state which made the flexible joint with expansion / contraction function of this invention, and connected the successor pipe to a double pipe. 本発明の伸縮機能付き可撓継手を構成として、二重管及び後続管を管渠（函渠）内に施工した状態を示す概略断面図である。It is schematic cross-sectional view which shows the state in which the double pipe and the succeeding pipe were constructed in the pipe (box) with the flexible joint with the expansion / contraction function of the present invention configured. 図５のｄ−ｄ線における断面図である。It is sectional drawing in the dd line of FIG. 地震等による地盤変位後の管渠（函渠）内の二重管及び後続管の状態を示す断面図である。It is sectional drawing which shows the state of the double pipe and the succeeding pipe in a pipe (box) after the ground displacement by an earthquake or the like. 管渠（函渠）内に架台を設置した状態を示す概略の正面図である。It is a schematic front view which shows the state which the pedestal is installed in a pipe (box). 図８のｅ−ｅ線における概略の平断面図である。FIG. 5 is a schematic plan sectional view taken along the line EE of FIG.

以下、本発明の実施の形態について図面を参照しつつ説明する。
図１は本発明を構成する二重管の一方である外管を示し、Ａは縦断面図、ＢはＡのａ−ａ線における断面図、図２は本発明を構成する二重管の他方である内管を示し、Ａは縦断面図、ＢはＡのｂ−ｂ線における断面図、図３は本発明を構成する後続管を示し、Ａは半断面図、ＢはＡのｃ−ｃ線における断面図、図４は本発明の伸縮機能付き可撓継手を構成として、二重管に後続管を連結させた状態を示す断面図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an outer tube which is one of the double tubes constituting the present invention, A is a vertical sectional view, B is a sectional view taken along the line aa of A, and FIG. 2 is a double tube constituting the present invention. The other inner tube is shown, A is a vertical sectional view, B is a sectional view taken along line bb of A, FIG. 3 shows a subsequent tube constituting the present invention, A is a semi-sectional view, and B is c of A. FIG. 4 is a cross-sectional view taken along the line −c, which is a cross-sectional view showing a state in which the flexible joint with the expansion / contraction function of the present invention is configured and the succeeding pipe is connected to the double pipe.

本発明の伸縮機能付き可撓継手は、二重管１０、後続管２０及びこれらを連結する連結部Ｐを有して構成され、さらには後述する緊結プレート３０を有して構成される。 The flexible joint with an expansion / contraction function of the present invention is configured to have a double pipe 10, a succeeding pipe 20, and a connecting portion P for connecting them, and further has a binding plate 30 described later.

二重管１０は、図１に示すような外管１１と、図２に示すような内管１２とにより構成され、外管１１の内側に内管１２が挿入された二重構造の管である（図４参照）。 The double pipe 10 is composed of an outer pipe 11 as shown in FIG. 1 and an inner pipe 12 as shown in FIG. 2, and is a double-structured pipe in which the inner pipe 12 is inserted inside the outer pipe 11. Yes (see Figure 4).

外管１１は例えば円筒状の鋼管などから構成され、内管１２は外側を鋼管で覆ったプレキャスト製鉄筋コンクリート管などで構成される。内管１２の複数の位置にはゴム輪１４が周設されており、一端（図２Ａでは右端）には内管１２本体と一体に又は別部材から成る円筒状のカラー部１３が設けられている。
後続管２０は、例えば図３に示すようなプレキャスト製の推進工法用の鉄筋コンクリート管などで構成され、図３Ａに示すように、後続管２０の左端には細口段差状に形成された差込み口２１の周囲にゴム輪２２が周設される構成である。 The outer pipe 11 is made of, for example, a cylindrical steel pipe, and the inner pipe 12 is made of a precast reinforced concrete pipe whose outside is covered with a steel pipe. Rubber rings 14 are provided around the inner pipe 12 at a plurality of positions, and a cylindrical collar portion 13 integrally with the inner pipe 12 main body or made of a separate member is provided at one end (right end in FIG. 2A). There is.
The succeeding pipe 20 is composed of, for example, a precast reinforced concrete pipe for a propulsion method as shown in FIG. 3, and as shown in FIG. 3A, an insertion port 21 formed in a narrow step shape at the left end of the succeeding pipe 20. A rubber ring 22 is provided around the surface of the rubber ring 22.

尚、外管１１と内管１２から構成される二重管１０及び後続管２０は上記のような円筒形状に限られるものではなく、その他例えば箱型形状、馬蹄形状で構成することも可能である。
また外管１１は鋼管に限定されるものではなく、内管１２及び後続管２０もプレキャスト製鉄筋コンクリート管に限定されるものではない。外管１１、内管１２及び後続管２０は、その他例えば塩ビ管、レジン管、ＦＲＰＭ管、鋼管など様々な材質からなる管を使用できる場合がある。 The double pipe 10 and the succeeding pipe 20 composed of the outer pipe 11 and the inner pipe 12 are not limited to the above-mentioned cylindrical shape, and can also be formed in, for example, a box shape or a horseshoe shape. is there.
Further, the outer pipe 11 is not limited to the steel pipe, and the inner pipe 12 and the succeeding pipe 20 are not limited to the precast reinforced concrete pipe. As the outer pipe 11, the inner pipe 12, and the succeeding pipe 20, other pipes made of various materials such as vinyl chloride pipe, resin pipe, FRPM pipe, and steel pipe may be used.

図４に示すように、二重管１０を構成する外管１１と内管１２とは、相対的に管軸Ｏに沿って縦方向（管軸方向ともいう）に移動可能に構成されており、内管１２の端部に後続管２０が連結されることにより、伸縮機能付き可撓継手が構成されている。
より詳しくは、内管１２は、内管１２の外周面に周設された複数のゴム輪１４を介して外管１１の内周面に接しており、このゴム輪１４が外管１１の内周面上を管軸方向に滑動することで移動することが可能となっている。また内管１２と後続管２０とは、内管１２の端部に設けられたカラー部１３と後続管２０の差込み口２１とで構成される連結部Ｐにおいて嵌合的に連結されている。すなわち、連結部Ｐは、内管１２側のカラー部１３の内側に後続管２０側の差込み口２１の外周面に周設されたゴム輪２２が嵌合的に挿入される構成である。このような連結部Ｐは、内管１２と後続管２０とを連結する機能と共に、管軸Ｏに対して直交する方向（水平方向及び垂直方向、以下同様）に対する屈曲性（可撓性ともいう。）を備えたヒンジ機能を有する。 As shown in FIG. 4, the outer pipe 11 and the inner pipe 12 constituting the double pipe 10 are configured to be relatively movable in the vertical direction (also referred to as the pipe axis direction) along the pipe axis O. By connecting the succeeding pipe 20 to the end of the inner pipe 12, a flexible joint with an expansion / contraction function is formed.
More specifically, the inner pipe 12 is in contact with the inner peripheral surface of the outer pipe 11 via a plurality of rubber rings 14 provided around the outer peripheral surface of the inner pipe 12, and the rubber ring 14 is inside the outer pipe 11. It is possible to move by sliding on the peripheral surface in the direction of the pipe axis. Further, the inner pipe 12 and the succeeding pipe 20 are fitted to each other at a connecting portion P composed of a collar portion 13 provided at the end of the inner pipe 12 and an insertion port 21 of the succeeding pipe 20. That is, the connecting portion P has a configuration in which the rubber ring 22 provided around the outer peripheral surface of the insertion port 21 on the succeeding pipe 20 side is fitted and inserted inside the collar portion 13 on the inner pipe 12 side. Such a connecting portion P has a function of connecting the inner pipe 12 and the succeeding pipe 20, and also has flexibility (also referred to as flexibility) in a direction orthogonal to the pipe axis O (horizontal direction and vertical direction, the same applies hereinafter). It has a hinge function with.).

次に、上記伸縮機能付き可撓継手を有する管渠（函渠）を施工する一実施例について説明する。
図５は発明の伸縮機能付き可撓継手を構成として、二重管及び後続管を管渠（函渠）内に施工した状態を示す概略断面図、図６は図５のｄ−ｄ線における断面図、図７は地震等による地盤変位後の管渠（函渠）内の二重管及び後続管の状態を示す断面図である。尚、図７では地盤変位後の二重管１０の管軸をＯ１０で示し、後続管２０の管軸をＯ２０で示している。 Next, an embodiment of constructing a pipe (box) having the flexible joint with an expansion / contraction function will be described.
FIG. 5 is a schematic cross-sectional view showing a state in which a double pipe and a succeeding pipe are constructed in a pipe (box) with the flexible joint having the expansion / contraction function of the present invention configured, and FIG. 6 is a line dd of FIG. The cross-sectional view and FIG. 7 are cross-sectional views showing the state of the double pipe and the succeeding pipe in the pipe (box) after the ground displacement due to an earthquake or the like. Note that the tube axis of the double tube 10 after 7 in ground displacement indicated by O 10, shows a tube axis of a subsequent tube 20 O 20.

以下の説明では管渠の一例としてボックスカルバート（函渠）の場合を示して説明するが、円筒形状、馬蹄形状などその他の形状から成る渠に用いる場合も同様である。このように本発明における管渠は、ボックスカルバート（函渠）を始め、その他の円筒形状、馬蹄形状などの形状から成る渠を含むものである。
図５及び図６に示す管渠１（１Ａ及び１Ｂ）は、例えば中央に矩形状の空間部を備えたコンクリート製のボックスカルバート（函渠）であり、このような管渠１は、例えばコンクリート打設時に止水板を埋め込んで施工される公知の継手部２を介して縦方向（管軸方向）に複数連設されることにより上下水道、共同溝等の管路施設が構築されている。
尚、このような管渠１は工事現場で型枠を作った後に、その型枠の中にコンクリートを流し込んで作ったものでも良いし、予め工場にて生産したプレキャストコンクリート製の管渠１を工事現場に運び込んでつなぎ合わせるものであってもよい。 In the following description, the case of a box culvert (box culvert) will be described as an example of a culvert, but the same applies to a culvert having other shapes such as a cylindrical shape and a horseshoe shape. As described above, the pipe culvert in the present invention includes a culvert having a box culvert (box culvert) and other shapes such as a cylindrical shape and a horseshoe shape.
The pipes 1 (1A and 1B) shown in FIGS. 5 and 6 are, for example, concrete box culverts having a rectangular space in the center, and such pipes 1 are, for example, concrete. Pipeline facilities such as water and sewage systems and utility tunnels are constructed by connecting a plurality of pipes in the vertical direction (pipe axis direction) via known joints 2 that are constructed by embedding a water stop plate at the time of casting. ..
It should be noted that such a pipe 1 may be made by pouring concrete into the formwork after making a formwork at the construction site, or a precast concrete pipe 1 produced in advance at the factory. It may be carried to the construction site and joined together.

二重管１０及び後続管２０は連結された状態で、管渠１間を連結する継手部２を前後に跨ぐように設置されており、外管１１は一方の管渠１Ａに対してアンカー４１によって固定され、後続管２０は他方の管渠１Ｂに対してアンカー４１によって固定されている。 The double pipe 10 and the succeeding pipe 20 are installed so as to straddle the joint portion 2 connecting the pipes 1 in the front-rear direction in a connected state, and the outer pipe 11 is an anchor 41 with respect to one pipe 1A. The succeeding pipe 20 is fixed to the other pipe 1B by an anchor 41.

ここで、内管１２と後続管２０とを連結する連結部Ｐは、管軸に対して直交する方向に屈曲性を備えたヒンジ機能を有する構造ではあるが、この構造のみの場合には地震等によって、継手部２にて連結されている管渠１Ａと管渠１Ｂとの間に目開きが発生すると、これに追従して内管１２側のカラー部１３に嵌合していた後続管２０の差込み口２１が抜け落ちて脱落する可能性がある。
そこで、本発明では、連結部Ｐを跨いで前後する内管１２の内周壁と後続管２０の内周壁とを、管軸対称となる左右２箇所の位置において、ステンレス等の腐食に強い金属製のプレート板からなる緊結プレート３０を介して連結することにより、ヒンジ機能を付与すると共に連結部Ｐにおける脱落を効果的に防止している。 Here, the connecting portion P connecting the inner pipe 12 and the succeeding pipe 20 has a structure having a hinge function having flexibility in a direction orthogonal to the pipe axis, but in the case of only this structure, an earthquake occurs. When an opening occurs between the pipe culvert 1A and the pipe culvert 1B connected by the joint portion 2 or the like, the subsequent pipe fitted to the collar portion 13 on the inner pipe 12 side follows the opening. There is a possibility that the insertion port 21 of 20 may come off and fall off.
Therefore, in the present invention, the inner peripheral wall of the inner pipe 12 and the inner peripheral wall of the succeeding pipe 20 that are moved back and forth across the connecting portion P are made of a metal resistant to corrosion such as stainless steel at two positions on the left and right that are symmetrical with each other. By connecting via the binding plate 30 made of the plate plate of the above, the hinge function is imparted and the detachment at the connecting portion P is effectively prevented.

具体的には、すなわち、内管１２及び後続管２０の各内周壁に設置された各ボルト４２（図２及び図３参照）に、緊結プレート３０の両端に設けられた長穴３１を夫々挿通させると共に、各ボルト４２の先端に取り付けたナット４３を螺着し、連結部Ｐを跨いで前後する内管１２と後続管２０との間に緊結プレート３０を架設させた状態で各内周壁に強固に固定している。また緊結プレート３０は、その両端に穿設する孔を長穴３１としてこの長穴３１内をボルト４２が移動できるように構成してある。緊結プレート３０は連結部Ｐにおける屈曲性能（ヒンジ機能）をある程度拘束することになるが、この連結部Ｐには後続管２０の差込み口２１が内管１２のカラー部１３から抜け落ちない範囲で自由な挙動を確保する余裕が設けられている。 Specifically, that is, elongated holes 31 provided at both ends of the binding plate 30 are inserted into the bolts 42 (see FIGS. 2 and 3) installed on the inner peripheral walls of the inner pipe 12 and the succeeding pipe 20, respectively. At the same time, the nut 43 attached to the tip of each bolt 42 is screwed, and the binding plate 30 is erected between the inner pipe 12 and the succeeding pipe 20 which are moved back and forth across the connecting portion P and are attached to each inner peripheral wall. It is firmly fixed. Further, the binding plate 30 is configured such that the holes formed at both ends thereof are elongated holes 31 so that the bolts 42 can move in the elongated holes 31. The binding plate 30 restrains the bending performance (hinge function) in the connecting portion P to some extent, but the connecting portion P is free as long as the insertion port 21 of the succeeding pipe 20 does not fall out from the collar portion 13 of the inner pipe 12. There is a margin to ensure good behavior.

図７に示すように、地震等の地盤変位によって、連結された管渠１に対して管軸Ｏに対して直交する方向の変位が作用して管渠１間を連結する継手部２（図５参照）に目開きが発生した場合には、二重管１０及び後続管２０はその動きに追従してヒンジ機能を備えた連結部Ｐにおいて屈曲する。すなわち、二重管１０及び後続管２０は、緊結プレート３０によって拘束されている連結部Ｐにおいて、嵌合していた後続管２０の差込み口２１が内管１２のカラー部１３から抜け落ちない範囲において自由に屈曲して、その地盤変位を吸収する。また管軸Ｏに沿って互いに離れる方向の地盤変位が作用して管渠１間を連結する継手部２に目開きが発生した場合には、二重管１０及び後続管２０はその動きに追従して二重管１０を構成する内管１２がアンカー４１で固定された状態にある外管１１内を移動して外管１１の外部に突出することで伸長し、その地盤変位を吸収する。 As shown in FIG. 7, due to a ground displacement such as an earthquake, a displacement in a direction perpendicular to the pipe axis O acts on the connected pipe 1 to connect the joint portion 2 (FIG. 7). When an opening occurs in (see 5), the double pipe 10 and the succeeding pipe 20 are bent at the connecting portion P having a hinge function following the movement. That is, in the connecting portion P restrained by the binding plate 30, the double pipe 10 and the succeeding pipe 20 are provided in a range in which the insertion port 21 of the fitted succeeding pipe 20 does not fall out from the collar portion 13 of the inner pipe 12. It bends freely to absorb the ground displacement. Further, when the ground displacement in the direction away from each other along the pipe axis O causes the joint portion 2 connecting the pipes 1 to open, the double pipe 10 and the succeeding pipe 20 follow the movement. Then, the inner pipe 12 constituting the double pipe 10 moves in the outer pipe 11 in a state of being fixed by the anchor 41 and protrudes to the outside of the outer pipe 11 to extend and absorb the ground displacement.

このように本発明では、地震等による非常に大きな地盤変位によって管渠１間を連結する継手部２に目開きが発生しても、管渠１の内側に伸縮機能付き可撓継手を設けることにより、目開きに追従してこの伸縮機能付き可撓継手を構成する連結部Ｐにおいて屈曲が行われ、またはこれに加えて、あるいは単独で二重管１０を構成する内管１２が突出してそれらの地盤変位を吸収して管渠１としての機能を維持する。よって、管渠１の耐震性を向上させることができ、土砂流入による閉塞を防止することが可能である。 As described above, in the present invention, even if the joint portion 2 connecting the pipes 1 is opened due to a very large ground displacement due to an earthquake or the like, a flexible joint with an expansion / contraction function is provided inside the pipe 1. As a result, bending is performed at the connecting portion P that constitutes this flexible joint with an expansion / contraction function following the opening, or in addition to this, or in addition to this, the inner pipe 12 that constitutes the double pipe 10 protrudes from them. It absorbs the ground displacement of and maintains the function as a pipe 1. Therefore, the seismic resistance of the pipe 1 can be improved, and blockage due to the inflow of earth and sand can be prevented.

次に上記伸縮機能付き可撓継手の施工方法について説明する。
図８は管渠内に架台を設置した状態を示す概略の正面図、図９は図８のｅ−ｅ線における概略の平断面図である。
管渠１の上流側または下流側の開放箇所に後続管２０（二重管１０も同様）を吊り降ろし、計画される所定の位置まで夫々けん引機５０、ワイヤー５１、立込み反力５２及び反力部材５３等を駆使して引き込むことで施工する。後続管２０の引き込みに際しては、これらの管を滑動させる架台（ガイドレール）６０が使用される。
架台６０は、Ｈ鋼６１や平鋼（ＦＬ）６２等により構成され、管の吊り降ろしを行う位置から所定の設置位置まで段差が生じないようにした状態で管渠１の中まで連続して配置される。尚、管渠１には、円形、矩形、馬蹄形など各種の内空断面を有するものが存在するが、それぞれの内空断面形状に合わせた架台６０が施工されている。 Next, a method of constructing the flexible joint with an expansion / contraction function will be described.
FIG. 8 is a schematic front view showing a state in which the gantry is installed in the pipe, and FIG. 9 is a schematic plan sectional view taken along the line EE of FIG.
Subsequent pipe 20 (same for double pipe 10) is hung from the open portion on the upstream side or downstream side of the pipe 1, and the towing machine 50, the wire 51, the standing reaction force 52, and the anti-reverse are reached to the planned predetermined positions, respectively. It is constructed by pulling in by making full use of the force member 53 and the like. When the succeeding pipes 20 are pulled in, a pedestal (guide rail) 60 for sliding these pipes is used.
The gantry 60 is made of H-steel 61, flat steel (FL) 62, or the like, and is continuous from the position where the pipe is suspended to the predetermined installation position into the pipe 1 in a state where a step is not generated. Be placed. There are pipes 1 having various in-air cross sections such as a circle, a rectangle, and a horseshoe shape, and a gantry 60 is constructed according to each in-air cross-section shape.

まず、二重管１０と後続管２０を連結された管渠１間の継手部２の近傍の位置まで別々に引き込み、二重管１０を構成する内管１２と後続管２０との連結部Ｐにおける連結作業を行う。
次に、二重管１０を構成する内管１２と後続管２０の内壁同士を緊結プレート３０で連結する。
次に、二重管１０を構成する外管１１を一方の管渠１Ａの内壁にアンカー４１で固定し、後続管２０を他方の管渠１Ｂの内壁にアンカー４１で固定する。
次に、二重管１０を構成する外管１１及び後続管２０と管渠１の内壁との隙間６９にコンクリートなどの充填材７０を充填する。これにより、外管１１及び後続管２０を管渠１内に固定することができると共に、既設の管渠１を補強することができる。
尚、充填材７０の充填は、管渠１の区間中に挿入した管（二重管１０と後続管２０）の周りを含め区間全域に渡るように行ってもよいし、二重管１０と後続管２０が挿入された部分の周りだけに行ってもよい。また充填材７０としては、コンクリートの他にモルタルやエポキシ系樹脂などを使用することができる。 First, the double pipe 10 and the succeeding pipe 20 are separately pulled in to a position near the joint portion 2 between the connected pipes 1, and the connecting portion P between the inner pipe 12 and the succeeding pipe 20 constituting the double pipe 10 is pulled in separately. Perform the connection work in.
Next, the inner pipe 12 constituting the double pipe 10 and the inner walls of the succeeding pipe 20 are connected to each other by a binding plate 30.
Next, the outer pipe 11 constituting the double pipe 10 is fixed to the inner wall of one pipe 1A with an anchor 41, and the succeeding pipe 20 is fixed to the inner wall of the other pipe 1B with an anchor 41.
Next, a filler 70 such as concrete is filled in the gap 69 between the outer pipe 11 and the succeeding pipe 20 forming the double pipe 10 and the inner wall of the pipe 1. As a result, the outer pipe 11 and the succeeding pipe 20 can be fixed in the pipe 1, and the existing pipe 1 can be reinforced.
The filler 70 may be filled over the entire section including the circumference of the pipes (double pipe 10 and succeeding pipe 20) inserted in the section of the pipe 1 or the double pipe 10. It may go only around the portion where the successor pipe 20 is inserted. Further, as the filler 70, mortar, epoxy resin, or the like can be used in addition to concrete.

以上、実施例に沿って本発明の構成とその作用効果について説明したが、本発明の実施の形態は上記実施例に限定されるものではない。
例えば、上記実施例では、内管１２と後続管２０との間に架設される緊結プレート３０を、管軸対称となる左右２箇所の位置に設けた例を示して説明したが、本発明はこれに限定されるものではなく、複数の位置に設けた構成であっても良い。 Although the configuration of the present invention and its action and effect have been described above with reference to Examples, the embodiments of the present invention are not limited to the above Examples.
For example, in the above-described embodiment, the binding plates 30 erected between the inner pipe 12 and the succeeding pipe 20 are provided at two positions on the left and right sides that are symmetrical with respect to the pipe axis. The configuration is not limited to this, and the configuration may be provided at a plurality of positions.

また上記においては、最も好ましい実施例として、地震等の地盤変位が発生したときに、外管１１から内管１２が突出する構成と、緊結プレート３０に拘束されつつ連結部Ｐで屈曲する構成の双方を備える場合を示して説明したが、本発明の伸縮機能付き可撓継手はこれに限定されるものではなく、いずれか一方の構成のみを有するものとすることもできる。 Further, in the above, as the most preferable embodiment, when the ground displacement such as an earthquake occurs, the inner pipe 12 protrudes from the outer pipe 11 and the inner pipe 12 bends at the connecting portion P while being restrained by the binding plate 30. Although the case where both are provided has been described, the flexible joint with the expansion / contraction function of the present invention is not limited to this, and may have only one of the configurations.

本発明の伸縮機能付き可撓継手は、耐震性が求められる管渠の分野における用途展開をさらに広い領域で図ることができる。 The flexible joint with a telescopic function of the present invention can be used in a wider range of applications in the field of pipes where seismic resistance is required.

１ ： 管渠
２ ： 継手部
１０ ： 二重管
１１ ： 外管
１２ ： 内管
１３ ： カラー部
１４ ： ゴム輪
２０ ： 後続管
２１ ： 差込み口
２２ ： ゴム輪
３０ ： 緊結プレート
３１ ： 長穴
４１ ： アンカー
４２ ： ボルト
４３ ： ナット
５０ ： けん引機
５１ ： ワイヤー
５２ ： 立込み反力
５３ ： 反力部材
６０ ： 架台
６１ ： Ｈ鋼
６２ ： 平鋼（ＦＬ）
６９ ： 隙間
７０ ： 充填材
Ｏ ： 管軸
Ｏ１０ ： 変位後の二重管の管軸
Ｏ２０ ： 変位後の後続管の管軸
Ｐ ： 連結部 1: Pipe culvert 2: Joint part 10: Double pipe 11: Outer pipe 12: Inner pipe 13: Collar part 14: Rubber ring 20: Subsequent pipe 21: Insertion port 22: Rubber ring 30: Binding plate 31: Long hole 41 : Anchor 42: Bolt 43: Nut 50: Towing machine 51: Wire 52: Standing reaction force 53: Reaction force member 60: Stand 61: H steel 62: Flat steel (FL)
69: Gap 70: Filler O: Pipe shaft O 10 : Pipe shaft O of double pipe after displacement O 20 : Pipe shaft P of succeeding pipe after displacement P: Connecting part

Claims (6)

連結された管渠（１）間の継手部（２）に配置される伸縮機能付き可撓継手であって、
外管（１１）と該外管（１１）内に挿入された内管（１２）とが互いに管軸方向に相対的に移動可能に設けられた二重管（１０）と、前記内管（１２）に連結部（Ｐ）を介して連結された後続管（２０）とを有し、連結された一方の管渠（１Ａ）内に前記外管（１１）が固定され、他方の管渠（１Ｂ）内に前記後続管（２０）が固定されていることを特徴とする伸縮機能付き可撓継手。 It is a flexible joint with an expansion / contraction function that is placed in the joint portion (2) between the connected pipes (1).
A double pipe (10) provided so that the outer pipe (11) and the inner pipe (12) inserted into the outer pipe (11) can move relative to each other in the pipe axis direction, and the inner pipe ( 12) has a succeeding pipe (20) connected via a connecting portion (P), and the outer pipe (11) is fixed in one of the connected pipes (1A), and the other pipe is fixed. A flexible joint with an expansion / contraction function, wherein the succeeding pipe (20) is fixed in (1B). 連結部（Ｐ）は、内管（１２）側に設けられたカラー部（１３）の内側に、後続管（２０）の差込み口（２１）が挿入される構成である請求項１記載の伸縮機能付き可撓継手。 The expansion and contraction according to claim 1, wherein the connecting portion (P) has a configuration in which the insertion port (21) of the succeeding pipe (20) is inserted inside the collar portion (13) provided on the inner pipe (12) side. Flexible joint with function. 内管（１２）と後続管（２０）とが、両者の間に架設された緊結プレート（３０）を介して連結されている請求項１又は２記載の伸縮機能付き可撓継手。 The flexible joint with an expansion / contraction function according to claim 1 or 2, wherein the inner pipe (12) and the succeeding pipe (20) are connected via a binding plate (30) erected between them. 一方の管渠（１Ａ）の内壁と外管（１１）との間及び他方の管渠（１Ｂ）の内壁と後続管（２０）との間に、充填材（７０）が充填されている請求項１乃至３のいずれか一項に記載の管渠の伸縮機能付き可撓継手。 A claim in which a filler (70) is filled between the inner wall and the outer pipe (11) of one pipe (1A) and between the inner wall and the succeeding pipe (20) of the other pipe (1B). The flexible joint with an expansion / contraction function of the pipe according to any one of Items 1 to 3. 管渠（１）が、円筒形状、箱型形状又は馬蹄形状である請求項１乃至４のいずれか一項に記載の伸縮機能付き可撓継手。 The flexible joint with an expansion / contraction function according to any one of claims 1 to 4, wherein the pipe (1) has a cylindrical shape, a box shape, or a horseshoe shape. 二重管及（１０）及び後続管（２０）が、円筒形状、箱型形状又は馬蹄形状である請求項１乃至５のいずれか一項に記載の伸縮機能付き可撓継手。
The flexible joint with an expansion / contraction function according to any one of claims 1 to 5, wherein the double pipe and the succeeding pipe (20) have a cylindrical shape, a box shape, or a horseshoe shape.
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