JP6340733B2 - Anti-seismic joint - Google Patents

Anti-seismic joint Download PDF

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JP6340733B2
JP6340733B2 JP2015129857A JP2015129857A JP6340733B2 JP 6340733 B2 JP6340733 B2 JP 6340733B2 JP 2015129857 A JP2015129857 A JP 2015129857A JP 2015129857 A JP2015129857 A JP 2015129857A JP 6340733 B2 JP6340733 B2 JP 6340733B2
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resistance
stopper
seismic
detachment
thrust
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JP2017015120A (en
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善平 三岡
善平 三岡
秋元 昌哲
昌哲 秋元
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Nippon Hume Corp
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Description

本発明は、農業用水路等の地中管路を構成する管体間を連結する継手であって、主に地中管路中の曲線部に隣接する直線部を構成する管体間を連結する耐震離脱防止継手に関する。   [Technical Field] The present invention is a joint for connecting pipes constituting an underground pipe such as an agricultural waterway, and mainly connects pipes constituting a linear part adjacent to a curved part in the underground pipe. The present invention relates to a seismic detachment prevention joint.

従来、農業用水路等に使用される地中管路では、その途中に地形や地上構造物等に整合させて屈曲させた曲線部が設けられ、このような曲線部は、直管間に連結された曲管や、互いに傾けつつ管体を連結して曲線布設することで構成されている。   Conventionally, underground conduits used for agricultural waterways and the like are provided with curved portions that are bent in alignment with topography and ground structures, and such curved portions are connected between straight pipes. It is configured by connecting curved pipes and laying curves while tilting each other.

この管路の曲線部には、管路内の流体圧力によって屈曲半径方向外側に向けて所謂スラスト力が作用し、このスラスト力によって曲線部を構成する曲管と隣接する直管とが互いに離脱や振動するおそれがある。   A so-called thrust force acts outwardly in the bending radius direction due to fluid pressure in the pipe line, and the curved pipe constituting the curve part and the adjacent straight pipe are separated from each other by the thrust force. There is a risk of vibration.

従来、このようなスラスト力が作用する曲線部と隣接する管路の直線部には、スラスト反力に対抗する地盤抵抗を得るために必要な一定の長さに亘って管体間が互いに移動不能に連結された部分を設ける必要があった。   Conventionally, between the curved part where the thrust force acts and the straight part of the adjacent pipe line, the pipes move relative to each other over a certain length necessary to obtain ground resistance against the thrust reaction force. It was necessary to provide a part that was impossiblely connected.

一方、地中管路においては、管体間を連結する継手に一定の伸縮を許容しつつ、管体間を離脱不能に連結する耐震構造の離脱防止継手を使用し、地震動が発生した際には、管体間の離脱を防止しつつ、管体間を連結する各継手の伸縮により地盤の変位を吸収することが望まれている。   On the other hand, in underground conduits, when seismic motion occurs, seismic structure joints that allow the pipes to be connected to each other while allowing for certain expansion and contraction, and to connect the pipes in a non-detachable manner. It is desired that the displacement of the ground be absorbed by expansion and contraction of each joint that connects the pipes while preventing the pipes from being separated.

この耐震構造の離脱防止継手は、例えば、地震動等によって両管体に大きな力が作用した際には、差し込み部がカラー部に対して抜け出し方向に移動することでその変位を吸収し、更に変位した場合には、差し込み部の外周面に固定されたリング状のストッパーが抜け出し防止用リングに当て止めされ抜け出しを防止するようになっている(例えば、特許文献1を参照)。   This seismic structure detachment prevention joint absorbs the displacement when the large force acts on both pipes due to, for example, seismic motion, etc., by moving the insertion part in the pull-out direction with respect to the collar part. In this case, a ring-shaped stopper fixed to the outer peripheral surface of the insertion portion is stopped against the escape prevention ring to prevent the withdrawal (see, for example, Patent Document 1).

特開平07−27266号公報Japanese Patent Laid-Open No. 07-27266

しかしながら、管路の曲線部と隣接する直線部を構成する各管体間を連結する継手は、スラスト力に対抗する十分な地盤抵抗を得るために一定長さに亘って管体間を互いに移動不能に連結する必要があり、特許文献1の如き離脱防止継手を適用できず、耐震構造に対応できないため、地震動等によって管路軸方向の力が作用すると、それに伴う変位を吸収できずに継手が破損するおそれがあった。   However, the joints connecting the pipes that make up the straight line part adjacent to the curved part of the pipe line move with respect to each other over a certain length in order to obtain sufficient ground resistance against the thrust force. It is necessary to connect the joints in an impossible manner, and the joint for preventing detachment as in Patent Document 1 cannot be applied, and the joint cannot cope with the earthquake-resistant structure. Could be damaged.

更に、曲線部を多用する地中管路においては、曲線部に接続される直線部に上述したスラスト力に対抗する地盤抵抗を得るために必要な十分な長さを確保できない場合があり、その場合、更に直線部を構成する管体間に耐震構造の離脱防止継手を適用し難いという問題があった。   Furthermore, in underground pipes that use a lot of curved parts, it may not be possible to secure a sufficient length necessary to obtain ground resistance against the thrust force described above in the straight parts connected to the curved parts. In this case, there is a problem that it is difficult to apply the seismic-resistant detachment joint between the pipes constituting the straight portion.

そこで、本発明は、このような従来の問題に鑑み、通常時にはスラスト力に対抗でき、且つ、地震動発生時の耐震性能を兼ね備えた管路用離脱防止継手の提供を目的としてなされたものである。   Therefore, in view of such a conventional problem, the present invention has been made for the purpose of providing a joint for preventing the separation of a pipe that can withstand a thrust force at a normal time and also has a seismic performance when an earthquake motion occurs. .

上述の如き従来の問題を解決し、所期の目的を達成するための請求項1に記載の発明の特徴は、互いに連結される一方の管体の端面より他方側に突出した筒状のカラー部と、他方の管体の端部に配置され、前記カラー部内に挿入される差し込み部と、前記カラー部の内周面と前記差し込み部の外周面との隙間に介在させた止水パッキンとを備え、前記両管体を離脱不能に接続する耐震離脱防止継手であって、前記カラー部の内周面にリング状に突出した抜け出し防止凸部を備え、前記差し込み部には、差し込み方向先端側の外周部に所望の周方向ピッチで半径方向に向けた複数の耐震離脱抵抗用ストッパー嵌合部にそれぞれストッパー金具を移動可能に嵌合させてなる耐震離脱抵抗部と、該耐震離脱抵抗部の差し込み方向手前側に距離を置いて配置され、前記耐震離脱抵抗用ストッパー嵌合部間の周方向ピッチに比べて広い周方向ピッチで半径方向に向けた複数のスラスト抵抗用ストッパー嵌合部にそれぞれストッパー金具を移動可能に嵌合させてなるスラスト抵抗部とを備え、前記カラー部に前記差し込み部を差し込み、前記差し込み部の外周面より前記各ストッパー金具を突出させ、前記スラスト抵抗部のストッパー金具を前記抜け出し防止凸部と係合させ、前記両管体間に一定以上の力が作用した際には前記スラスト抵抗部のストッパー金具が破断し、前記抜け出し防止用凸部が前記耐震離脱抵抗部側に移動できるようにした耐震離脱防止継手にある。 The feature of the invention described in claim 1 for solving the conventional problems as described above and achieving the intended object is a cylindrical collar projecting to the other side from the end face of one tubular body connected to each other. And an insertion portion that is disposed at the end of the other tubular body and is inserted into the collar portion, and a waterproof seal that is interposed in a gap between the inner peripheral surface of the collar portion and the outer peripheral surface of the insertion portion. An anti-seismic detachment preventing joint that connects the two pipe bodies in a non-detachable manner, and includes a slip-out preventing protruding portion protruding in a ring shape on the inner peripheral surface of the collar portion, and the insertion portion has a distal end in the insertion direction. A seismic detachment resistance portion in which a stopper fitting is movably fitted to a plurality of stopper fitting portions for seismic detachment resistance oriented in the radial direction at a desired circumferential pitch on the outer peripheral portion on the side, and the seismic detachment resistance portion Place a distance in front of the insertion direction The stopper fittings are movably fitted to a plurality of thrust resistance stopper fitting portions that are arranged in the radial direction at a wider circumferential pitch than the circumferential pitch between the stopper fitting portions for seismic detachment resistance. A thrust resistance portion formed by inserting the insertion portion into the collar portion, projecting the stopper fittings from the outer peripheral surface of the insertion portion, and engaging the stopper fittings of the thrust resistance portion with the protrusion preventing projections. When the force of a certain level or more is applied between the pipes, the stopper metal fitting of the thrust resistance portion is broken, and the protrusion for preventing withdrawal is moved to the earthquake-resistant separation resistance portion side. In the prevention joint.

請求項2に記載の発明の特徴は、請求項1の構成に加え、前記耐震離脱抵抗用ストッパー嵌合部及び前記スラスト抵抗用ストッパー嵌合部は、その内周面部に雌ネジを有するアンカーナットを備え、前記ストッパー金具の外周に形成された雄ネジが前記アンカーナットに螺合されるようにしたことにある。   According to a second aspect of the present invention, in addition to the structure of the first aspect, the stopper fitting portion for seismic detachment resistance and the stopper fitting portion for thrust resistance have an anchor nut having a female screw on an inner peripheral surface portion thereof. The male screw formed on the outer periphery of the stopper fitting is screwed onto the anchor nut.

本発明に係る耐震離脱防止継手は、上述したように、互いに連結される一方の管体の端面より他方側に突出した筒状のカラー部と、他方の管体の端部に配置され、前記カラー部内に挿入される差し込み部と、前記カラー部の内周面と前記差し込み部の外周面との隙間に介在させた止水パッキンとを備え、前記両管体を離脱不能に接続する耐震離脱防止継手であって、前記カラー部の内周面にリング状に突出した抜け出し防止凸部を備え、前記差し込み部には、差し込み方向先端側の外周部に所望の周方向ピッチで半径方向に向けた複数の耐震離脱抵抗用ストッパー嵌合部にそれぞれストッパー金具を移動可能に嵌合させてなる耐震離脱抵抗部と、該耐震離脱抵抗部の差し込み方向手前側に距離を置いて配置され、所望の周方向ピッチで半径方向に向けた複数のスラスト抵抗用ストッパー嵌合部にそれぞれストッパー金具を移動可能に嵌合させてなるスラスト抵抗部とを備え、前記カラー部に前記差し込み部を差し込み、前記差し込み部の外周面より前記各ストッパー金具を突出させ、前記スラスト抵抗部のストッパー金具を前記抜け出し防止凸部と係合させ、前記両管体間に一定以上の力が作用した際には前記スラスト抵抗部のストッパー金具が破断し、前記抜け出し防止用凸部が前記耐震離脱抵抗部側に移動できるようにしたことにより、通常時においては、スラスト抵抗部を構成するストッパー金具のせん断抵抗で管体を連結する継手部の伸縮を規制してスラスト力等に対抗し、地震動等により大きな外力が作用した際には、スラスト抵抗部を構成するストッパー金具が破断して地震動等に伴う変位を吸収できるとともに、耐震離脱抵抗部を構成するストッパー金具が抜け出し防止凸部に係合し、ストッパー金具の数量が多い耐震離脱抵抗部で地震動等による外力に対抗することで高い連結強度を維持することができる。また、地震動の終息後には、破断した通常離脱部を構成するストッパー金具を交換することによってスラスト力に対抗する状態を復元することができる。   As described above, the earthquake-resistant detachment preventing joint according to the present invention is disposed at the end of the other tubular body and the cylindrical collar portion protruding to the other side from the end surfaces of the one tubular body connected to each other, A seismic detachment comprising an insertion part inserted into the collar part, and a waterproof seal interposed in a gap between the inner peripheral surface of the collar part and the outer peripheral surface of the insertion part, and connecting the two tubes in a non-detachable manner. The joint is provided with a slip-out prevention convex part protruding in a ring shape on the inner peripheral surface of the collar part, and the insertion part is directed radially to the outer peripheral part on the distal end side in the insertion direction at a desired circumferential pitch. The seismic detachment resistance part, in which the stopper fitting is movably fitted to each of the plurality of seismic detachment resistance stopper fitting parts, and a distance in front of the seismic detachment resistance part in the insertion direction is arranged at a desired distance. Radial direction with circumferential pitch A plurality of thrust resistance stopper fitting portions facing each other, each having a thrust resistance portion in which a stopper fitting is movably fitted, and inserting the insertion portion into the collar portion, and from the outer peripheral surface of the insertion portion, Each stopper fitting is protruded, the stopper fitting of the thrust resistance portion is engaged with the pull-out prevention convex portion, and the stopper fitting of the thrust resistance portion breaks when a force exceeding a certain level is applied between the two tubes. In addition, since the protrusion for preventing withdrawal can be moved toward the seismic detachment resistance portion, the expansion and contraction of the joint portion that connects the pipes with the shear resistance of the stopper metal fitting that constitutes the thrust resistance portion is normally performed. When a large external force is applied due to seismic motion, etc., the stopper fittings that make up the thrust resistance section will break. Displacement due to seismic motion, etc. can be absorbed, and the stopper fittings that make up the seismic detachment resistance part engage with the protrusion prevention part, and the seismic detachment resistance part with a large number of stopper fittings is high by resisting external forces due to seismic motion, etc. The connection strength can be maintained. In addition, after the end of the earthquake motion, the state against the thrust force can be restored by exchanging the stopper fitting constituting the fractured normal separation part.

また、本発明において、前記スラスト抵抗用ストッパー嵌合部間の周方向ピッチは、前記耐震離脱抵抗用ストッパー嵌合部間の周方向ピッチに比べて広くしていることにより、耐震離脱抵抗部に比べてスラスト抵抗部のストッパー金具の数量を少なくでき、それにより、スラスト力に対抗可能であるが、それを超える大きな外力に対してはストッパー金具が破断するようにできる。   Further, in the present invention, the circumferential pitch between the thrust resistance stopper fitting portions is wider than the circumferential pitch between the earthquake resistant separation resistance stopper fitting portions. In comparison, the number of the stopper fittings in the thrust resistance portion can be reduced, thereby being able to counter the thrust force, but the stopper fitting can be broken for a large external force exceeding that.

また、本発明において、前記スラスト抵抗部は、前記スラスト抵抗用ストッパー嵌合部に嵌合させた各ストッパー金具を間欠的に突出させるようにしたことにより、差し込み部の外周面より突出するスラスト抵抗部のストッパー金具の数量を耐震離脱抵抗部のストッパー金具の数量より少なくでき、且つ、地震動等によってスラスト抵抗部のストッパー金具が破断した際には、未使用のストッパー金具を差し込み部の外周面より突出させることによりスラスト力に対抗可能な状態に復元することができる。   Further, in the present invention, the thrust resistance portion protrudes from the outer peripheral surface of the insertion portion by intermittently protruding each stopper fitting fitted to the thrust resistance stopper fitting portion. The number of stopper brackets on the part can be made smaller than the number of stopper brackets on the seismic detachment resistance part. By projecting, it can be restored to a state capable of resisting the thrust force.

更に、本発明において、前記耐震離脱抵抗用ストッパー嵌合部及び前記スラスト抵抗用ストッパー嵌合部は、その内周面部に雌ネジを有するアンカーナットを備え、前記ストッパー金具の外周に形成された雄ネジが前記アンカーナットに螺合されるようにしたことにより、設置作業が容易であるとともに、スラスト抵抗部を構成するストッパー金具が地震動等によってそのせん断抵抗を超える外力を受けて破断した場合であっても、当該破断したストッパー金具を容易に取り外し、新たなストッパー金具に交換することができ、継手をスラスト力に対抗可能な状態に復元することができる。   Further, in the present invention, the stopper fitting portion for seismic detachment resistance and the stopper fitting portion for thrust resistance include an anchor nut having a female screw on an inner peripheral surface portion thereof, and a male formed on the outer periphery of the stopper fitting. Since the screw is screwed onto the anchor nut, the installation work is easy, and the stopper fitting constituting the thrust resistance portion is broken by receiving an external force exceeding the shear resistance due to earthquake motion or the like. However, the broken stopper fitting can be easily removed and replaced with a new stopper fitting, and the joint can be restored to a state capable of resisting the thrust force.

本発明に係る地中管路の一例を示す平面図である。It is a top view which shows an example of the underground pipe line which concerns on this invention. 図1中の直線部用管体を示す部分拡大断面図である。It is a partial expanded sectional view which shows the tubular body for linear parts in FIG. 図1中の耐震離脱防止継手を示す断面図である。It is sectional drawing which shows the earthquake-proof detachment prevention joint in FIG. (a)は図3中のb−b線断面図、(b)は同c−c線断面図である。(A) is the bb sectional view taken on the line in FIG. 3, (b) is the cc sectional view taken on the same line. (a)は通常時の直線部用耐震離脱防止継手の状態を示す部分拡大断面図、(b)は同地震動が作用した際の状態を示す部分拡大断面図である。(A) is a partial expanded sectional view which shows the state of the earthquake resistant detachment prevention joint for linear parts at the normal time, (b) is a partial expanded sectional view which shows the state at the time of the seismic motion acting.

次に、本発明に係る耐震離脱防止継手の実施態様を図1〜図5に基づいて説明する。尚、図中符号Aは農業用水路等に使用される地中管路である。   Next, an embodiment of the seismic detachment preventing joint according to the present invention will be described with reference to FIGS. In addition, the code | symbol A in a figure is an underground conduit used for agricultural waterways.

また、本実施例においては、後述する差し込み部のカラー部に対する挿入方向を基準に説明し、差し込み部の挿入方向先端側を前とする。   In this embodiment, the insertion direction of the insertion portion to be described later with respect to the collar portion will be described as a reference, and the insertion direction front end side of the insertion portion will be the front.

地中管路Aは、複数の曲線部用管体1,1を互いに傾けて曲線布設してなる曲線部と、直線部用管体2,2を直線的に布設してなる曲線部と隣接する直線部とを備え、曲線部用管体1,1及び直線部用管体2,2が推進工法により地中に埋設され、曲線部用管体1,1間が曲線部用継手により連結され、曲線部用管体1と直線部用管体2との間及び直線部用管体2,2間が本発明に係る耐震離脱防止継手4により連結されている。   The underground conduit A is adjacent to a curved portion formed by laying a curved line by inclining a plurality of curved portion tubular bodies 1, 1 and a curved portion formed by laying the straight portion tubular bodies 2, 2 linearly. Straight pipe sections 1, 1 and straight pipe sections 2, 2 are embedded in the ground by the propulsion method, and the curved pipe sections 1, 1 are connected by a curved joint. The curved portion tubular body 1 and the straight portion tubular body 2 and the straight portion tubular bodies 2 and 2 are connected by the seismic detachment preventing joint 4 according to the present invention.

直線部用管体2は、図2に示すように、合成鋼管からなる推進管であり、外殻鋼管30の内周にコンクリート層31からなるライニングが施された構造となっている。   As shown in FIG. 2, the straight portion tubular body 2 is a propulsion pipe made of a synthetic steel pipe, and has a structure in which a lining made of a concrete layer 31 is applied to the inner periphery of the outer shell steel pipe 30.

尚、図中符号32,33は、それぞれ管体の端面に配置された端板、符号34,35はそれぞれ外殻鋼管30の内周面に周方向に間隔を置いて突設された補強用リブであり、各端板32,33が補強用リブ34,35の先端に支持されている。   In the figure, reference numerals 32 and 33 denote end plates disposed on the end face of the tubular body, and reference numerals 34 and 35 denote reinforcing plates that project from the inner peripheral face of the outer shell steel pipe 30 at intervals in the circumferential direction. It is a rib and each end plate 32 and 33 is supported by the tip of reinforcing ribs 34 and 35.

耐震離脱防止継手4は、図3、図4に示すように、連結される一方の管体2の端面より他方側に突出した筒状のカラー部36と、他方の管体2の端部に配置され、カラー部36内に挿入される差し込み部37と、カラー部36の内周面と差し込み部37の外周面との隙間に介在させた止水パッキン38とを備えている。   As shown in FIGS. 3 and 4, the seismic detachment prevention joint 4 is formed at a cylindrical collar portion 36 projecting from the end face of one of the tubular bodies 2 to be connected to the other side, and at the end of the other tubular body 2. An insertion portion 37 that is disposed and inserted into the collar portion 36 and a water blocking packing 38 that is interposed in a gap between the inner peripheral surface of the collar portion 36 and the outer peripheral surface of the insertion portion 37 are provided.

また、この耐震離脱防止継手4は、カラー部36の内周面にリング状に突出した抜け出し防止凸部39と、差し込み部37の先端側外周部に互いに周方向に間隔を置いて配置された半径方向に向けた複数の耐震離脱抵抗用ストッパー嵌合部40,40...にそれぞれストッパー金具41,41...を移動可能に嵌合させた耐震離脱抵抗部42と、耐震離脱抵抗部42の差し込み方向手前側に距離を置いて位置に所望の周方向ピッチで半径方向に向けた複数のスラスト抵抗用ストッパー嵌合部43,43...にそれぞれストッパー金具44,44...を移動可能に嵌合させてなるスラスト抵抗部45とを備え、カラー部36に差し込み部37を差し込み、その状態で差し込み部37の外周面より各ストッパー金具41,41...及びストッパー金具44,44...を突出させ、スラスト抵抗部45のストッパー金具44,44...を抜け出し防止凸部39と係合させている。   Further, the seismic detachment preventing joint 4 is disposed on the inner peripheral surface of the collar portion 36 with a slip-out preventing convex portion 39 protruding in a ring shape and a distal end side outer peripheral portion of the insertion portion 37 with a circumferential interval therebetween. A seismic detachment resistance portion 42 in which stopper fittings 41, 41... Are movably fitted to a plurality of seismic detachment resistance stopper fitting portions 40, 40. A plurality of thrust resistor stopper fitting portions 43, 43,... Are disposed at a desired circumferential pitch at a distance from the front side of 42 in the insertion direction, and stopper fittings 44, 44,. And a thrust resistance portion 45 that is movably fitted. The insertion portion 37 is inserted into the collar portion 36, and in this state, the stopper fittings 41, 41. 4 ... is projected to have a stopper fitting 44, 44 ... engaged with the restriction projection 39 exits the thrust resistance portion 45.

カラー部36は、外殻鋼管30の後端を延長した鋼管により形成され、管体2の端面より他方側(後方)に向けて一体に突出している。   The collar portion 36 is formed by a steel pipe extending from the rear end of the outer shell steel pipe 30, and protrudes integrally from the end face of the tubular body 2 toward the other side (rear).

このカラー部36の内周面には、後端側にリング状に突出した抜け出し防止凸部39を備え、その更に後端側に環状の止水パッキン38が嵌合されている。   On the inner peripheral surface of the collar portion 36, a slip-out preventing convex portion 39 protruding in a ring shape is provided on the rear end side, and an annular water-stop packing 38 is fitted on the rear end side.

また、カラー部36の後端内周面には、パッキン離脱防止用の丸棒からなるストッパー部材46が固定されており、止水パッキン38の外周面がカラー部36の内周面に固定され、ストッパー部材46に当て止めされて止水パッキン38がカラー部36より抜け出ないようになっている。   Further, a stopper member 46 made of a round bar for preventing packing from being detached is fixed to the inner peripheral surface of the rear end of the collar portion 36, and the outer peripheral surface of the water stop packing 38 is fixed to the inner peripheral surface of the collar portion 36. The water-stopping packing 38 is prevented from coming out of the collar portion 36 by being stopped by the stopper member 46.

抜け出し防止凸部39は、鋼材等の金属部材によりリング状に形成され、その外周が全周に亘ってカラー部36の内周面に溶接等によって強固に固定されている。   The pull-out prevention convex portion 39 is formed in a ring shape by a metal member such as steel, and the outer periphery thereof is firmly fixed to the inner peripheral surface of the collar portion 36 by welding or the like over the entire circumference.

止水パッキン38の態様は、特に限定されないが、例えば、内周側が差し込み部37の差し込み方向に傾斜させた複数の湾曲部38a,38a...を備えた形状に一体成形されたものを使用する。   Although the aspect of the water-stopping packing 38 is not particularly limited, for example, a structure that is integrally formed into a shape having a plurality of curved portions 38 a, 38 a... Whose inner peripheral side is inclined in the insertion direction of the insertion portion 37 is used. To do.

差し込み部37は、外殻鋼管30の端部を縮径加工した差し込み部外殻47を有し、その内周面が前述したコンクリート層31がライニングされた構造となっている。   The insertion portion 37 has an insertion portion outer shell 47 obtained by reducing the diameter of the end portion of the outer shell steel pipe 30, and has a structure in which the concrete layer 31 described above is lined on the inner peripheral surface thereof.

この差し込み部37には、その差し込み方向先端側外周部に互いに所望の周方向ピッチでそれぞれ半径方向に配置した複数の耐震離脱抵抗用ストッパー嵌合部40,40...を備えるとともに、耐震離脱抵抗部42と差し込み方向の手前側に一定の距離を置いた位置の外周部に所望の周方向ピッチでそれぞれ半径方向に向けた複数のスラスト抵抗用ストッパー嵌合部43,43...を備えている。   The insertion portion 37 is provided with a plurality of earthquake-resistant separation resistance stopper fitting portions 40, 40,. A plurality of thrust resistance stopper fitting portions 43, 43... Are provided in the radial direction at a desired circumferential pitch at the outer peripheral portion at a certain distance from the resistance portion 42 and the front side in the insertion direction. ing.

スラスト抵抗用ストッパー嵌合部43,43...は、その周方向ピッチが耐震離脱抵抗用ストッパー嵌合部40,40...の周方向ピッチより広く、その分、耐震離脱抵抗部42のストッパー金具41,41...の数量に比べてスラスト抵抗部45における差し込み部37の外周面より突出するストッパー金具44,44...の数量が少なくなっている。   The thrust resistance stopper fitting portions 43, 43... Are wider in circumferential pitch than the circumferential pitch of the earthquake resistant separation resistance stopper fitting portions 40, 40. The number of stopper fittings 44, 44... Protruding from the outer peripheral surface of the insertion part 37 in the thrust resistance portion 45 is smaller than the number of stopper fittings 41, 41.

即ち、スラスト抵抗部45は、地震動等の外力に対する十分な耐力が確保された耐震離脱抵抗部42に比べてストッパー金具44,44...の数量を少なくすることで、両直線部用管体2,2間に作用するスラスト力に対抗可能であるが、それを超える大きな外力に対してはストッパー金具44,44...が破断するように構成されている。   That is, the thrust resistance portion 45 is a tube body for both straight portions by reducing the number of stopper fittings 44, 44... As compared with the earthquake resistance separation resistance portion 42 in which sufficient strength against external force such as earthquake motion is ensured. Although it is possible to counter the thrust force acting between 2 and 2, the stopper fittings 44, 44,...

各耐震離脱抵抗用ストッパー嵌合部40,40...及び各スラスト抵抗用ストッパー嵌合部43,43...は、それぞれアンカーナット48の先端を差し込み部外殻47に形成した孔内に挿入し、差し込み部外殻47及び補強用リブ35に溶接し、これをコンクリート層31内に埋め込むことによって形成されている。   Each of the seismic detachment resistance stopper fitting portions 40, 40... And each of the thrust resistance stopper fitting portions 43, 43... Is inserted into a hole formed in the insertion portion outer shell 47 at the tip of the anchor nut 48. It is formed by being inserted and welded to the insertion portion outer shell 47 and the reinforcing rib 35 and embedded in the concrete layer 31.

また、各耐震離脱抵抗用ストッパー嵌合部40,40...及び各スラスト抵抗用ストッパー嵌合部43,43...には、それぞれストッパー金具41,44が半径方向に移動可能に嵌合され、このストッパー金具41,44が差し込み部37の外周面より外向きに突出するようになっている。   In addition, stopper fittings 41 and 44 are fitted to the stopper fitting portions 40, 40... For each seismic detachment resistance and the stopper fitting portions 43, 43. The stopper fittings 41 and 44 protrude outward from the outer peripheral surface of the insertion portion 37.

ストッパー金具41,44は、先端に小径部49を有する円柱状に形成され、先端の小径部49を除く外周面には雄ネジ50が刻設され、この雄ネジ50をアンカーナット48の雌ネジに螺合させることにより耐震離脱抵抗用ストッパー嵌合部40及びスラスト抵抗用ストッパー嵌合部43に嵌合されるようになっている。   The stopper fittings 41 and 44 are formed in a cylindrical shape having a small diameter portion 49 at the tip, and a male screw 50 is engraved on the outer peripheral surface excluding the small diameter portion 49 at the tip, and the male screw 50 is connected to the female screw of the anchor nut 48. Are fitted into the stopper fitting portion 40 for seismic detachment resistance and the stopper fitting portion 43 for thrust resistance.

ストッパー金具41,44の後端には、角型レンチ、例えば六角レンチ用の六角穴からなるレンチ穴51が形成され、この管内からレンチ穴51に角型レンチを嵌合させ回転させることにより、ストッパー金具41,44が耐震離脱抵抗用ストッパー嵌合部40及びスラスト抵抗用ストッパー嵌合部43内で螺進し、半径方向で移動できるようになっている。   At the rear ends of the stopper metal fittings 41 and 44, a wrench hole 51 made of a square wrench, for example, a hexagon socket for a hexagon wrench is formed. By fitting and rotating the square wrench into the wrench hole 51 from within the pipe, The stopper fittings 41 and 44 are screwed in the stopper fitting portion 40 for seismic detachment resistance and the stopper fitting portion 43 for thrust resistance, and can move in the radial direction.

また、ストッパー金具41,44は、その全長、即ち先端からレンチ穴51が開口している端面までの長さが差し込み部37のコンクリート層31の厚さより短く形成され、アンカーナット48内に収容された状態にしておき、操作によって先端部が差し込み部37の外周より突出するようになっている。   The stopper fittings 41 and 44 are formed such that the entire length, that is, the length from the tip to the end face where the wrench hole 51 is opened, is shorter than the thickness of the concrete layer 31 of the insertion portion 37 and is accommodated in the anchor nut 48. The tip portion protrudes from the outer periphery of the insertion portion 37 by the operation.

上述の如き耐震離脱防止継手4を使用した地中管路Aでは、両直線部用管体2,2の端板32,33間に、端面クッション材52を介してカラー部36に差し込み部37を差し込み、その状態で各ストッパー金具41,41...及びストッパー金具44,44...をその先端が、カラー部36の抜け出し防止凸部39の内径より外側に位置するまで突出させ、スラスト抵抗部45の各ストッパー金具44,44...と抜け出し防止凸部39とを係合させる。   In the underground conduit A using the above-described seismic detachment preventing joint 4, the insertion portion 37 is inserted into the collar portion 36 via the end face cushion material 52 between the end plates 32 and 33 of both the straight portion tubular bodies 2 and 2. In this state, the stopper fittings 41, 41... And the stopper fittings 44, 44... Are projected until their tips are located outside the inner diameter of the collar portion 36, and the thrust is prevented. The stopper fittings 44, 44... Of the resistance portion 45 are engaged with the slip-out prevention convex portion 39.

その際、ストッパー金具41,41...及びストッパー金具44,44...は、その先端がカラー部36の内周面に当接されるまで突出させることによって、所望の突出長さとなったことが確認できる。   At that time, the stopper fittings 41, 41... And the stopper fittings 44, 44... Have a desired protruding length by protruding until their tips are brought into contact with the inner peripheral surface of the collar portion 36. I can confirm that.

通常時においては、図1に示すように、地中管路A内を通る流体圧力によって曲線部に布設半径方向外側にスラスト力Sが作用する。   In a normal time, as shown in FIG. 1, a thrust force S acts on the curved portion on the outer side in the laying radial direction by the fluid pressure passing through the underground conduit A.

このスラスト力Sに対し、耐震離脱防止継手4は、図5(a)に示すように、管体2,2端面が突き合わされ、且つ、スラスト抵抗部45の各ストッパー金具44,44...と抜け出し防止凸部39とが係合された状態にあるので、スラスト抵抗部45のストッパー金具44,44...のせん断抵抗によって対抗し、直線部用管体2,2が互いに移動が規制される。   As shown in FIG. 5A, the seismic detachment preventing joint 4 against the thrust force S has the end faces of the tube bodies 2 and 2 abutted against each other, and the stopper fittings 44, 44... And the slip-out prevention convex portion 39 are engaged with each other, so that the resistance of the stopper fittings 44, 44... Is done.

その際、耐震離脱抵抗部42を構成しているストッパー金具41,41...は、管軸方向で抜け出し防止凸部39と距離を隔てた状態にあり、スラスト力Sに対する抵抗としては寄与していない状態にあるが、スラスト力Sが地震動等による外力に比べて小さいので、スラスト抵抗部45のストッパー金具44,44...のせん断耐力のみで十分にスラスト力Sに抵抗できるようになっている。   At that time, the stopper fittings 41, 41... Constituting the seismic detachment resistance portion 42 are in a state of being separated from the protrusion preventing portion 39 in the tube axis direction and contribute as resistance to the thrust force S. However, since the thrust force S is smaller than the external force due to seismic motion or the like, the thrust force S can be sufficiently resisted only by the shear strength of the stopper fittings 44, 44. ing.

そして、耐震離脱防止継手4では、地震動による地盤変位や地割れによって管体2,2が互いに離脱する方向に大きな外力が作用した場合、当該外力がスラスト抵抗部45を構成するストッパー金具44,44...のせん断耐力を超えると、図5(b)に示すように、スラスト抵抗部45を構成するストッパー金具44,44...の先端の小径部49が破断する。   In the seismic detachment prevention joint 4, when a large external force is applied in the direction in which the tubular bodies 2, 2 are separated from each other due to ground displacement or cracking due to earthquake motion, the external force constitutes the stopper fittings 44, 44. When the shear strength of... Is exceeded, the small-diameter portion 49 at the tip of the stopper fittings 44, 44... Constituting the thrust resistance portion 45 is broken, as shown in FIG.

そして、そのストッパー金具44,44...が破断すると、耐震離脱防止継手4は、耐震離脱抵抗部42の各ストッパー金具41,41...と抜け出し防止凸部39との間のスペースを利用して差し込み部37が抜け出し方向に移動して変位を吸収する。   When the stopper fittings 44, 44... Are broken, the seismic detachment prevention joint 4 uses the space between the stopper fittings 41, 41. Then, the insertion portion 37 moves in the withdrawal direction to absorb the displacement.

そして、差し込み部37が更に抜け出し方向に移動すると、耐震離脱抵抗部42を構成するストッパー金具41,41...が抜け出し防止凸部39に係合し、耐震離脱抵抗部42のストッパー金具41,41...のせん断耐力で地震動等による外力に対抗し、それ以上の差し込み部37の抜け出しが防止される。   Then, when the insertion portion 37 further moves in the withdrawal direction, the stopper fittings 41, 41... Constituting the earthquake-resistant separation resistance portion 42 engage with the withdrawal prevention convex portion 39, and the stopper fittings 41, 41,. The shear strength of 41... Resists external force due to earthquake motions and prevents the plug 37 from coming out further.

その際、耐震離脱抵抗部42がストッパー金具41,41...をスラスト抵抗部45に比べて多く備えるため、その分当該外力が分散でき、耐震離脱防止継手4は、常に高い抜け出し抵抗力が維持される。   At that time, since the seismic detachment resistance portion 42 includes a larger number of stopper fittings 41, 41... Than the thrust resistance portion 45, the external force can be dispersed accordingly, and the seismic detachment prevention joint 4 always has a high resistance to pulling out. Maintained.

次に、地震動発生後の本発明に係る耐震離脱防止継手4の復元について説明する。   Next, restoration of the seismic detachment preventing joint 4 according to the present invention after occurrence of earthquake motion will be described.

上述したように、本発明に係る耐震離脱防止継手4では、地震動等による外力がスラスト抵抗部45を構成するストッパー金具44,44...のせん断耐力を超える場合、スラスト抵抗部45を構成するストッパー金具44,44...の先端の小径部49が破断する。   As described above, in the anti-seismic detachment preventing joint 4 according to the present invention, the thrust resistance portion 45 is formed when the external force due to seismic motion or the like exceeds the shear strength of the stopper fittings 44, 44 ... constituting the thrust resistance portion 45. The small diameter portion 49 at the tip of the stopper fittings 44, 44.

その為、地震動終息後の耐震離脱防止継手4では、両直線部用管体2,2間の移動が規制されておらず、スラスト力Sに対抗することが出来ない状態にある。   Therefore, in the seismic detachment preventing joint 4 after the end of the earthquake motion, the movement between the two straight portion tubular bodies 2 and 2 is not restricted and the thrust force S cannot be countered.

しかしながら、このような構成の耐震離脱防止継手4では、スラスト抵抗部45を構成する破断したストッパー金具44,44...を取り外し、新たなストッパー金具44,44...を取り付けることによって、スラスト抵抗部45を構成するストッパー金具44,44...が抜け出し防止凸部39と係合するので、スラスト抵抗部45によってスラスト力Sに対抗する状態に復元することができる。   However, in the seismic detachment prevention joint 4 having such a configuration, the thrust stoppers 44, 44... Constituting the thrust resistance portion 45 are removed, and new stopper fittings 44, 44. Since the stopper fittings 44, 44... Constituting the resistance portion 45 are engaged with the escape preventing convex portion 39, the thrust resistance portion 45 can restore the state to oppose the thrust force S.

尚、上述の実施例では、スラスト抵抗用ストッパー嵌合部43,43間の周方向ピッチを耐震抵抗用ストッパー嵌合部40,40間の周方向ピッチに比べて広くしたスラスト抵抗部45を例について説明したが、スラスト抵抗部45は、スラスト抵抗用ストッパー嵌合部43,43を耐震抵抗用ストッパー嵌合部40,40と同様の周方向ピッチで備え、各ストッパー金具44,44...を所望の周方向ピッチで間欠的に突出させるようにしてもよい。   In the above-described embodiment, the thrust resistance portion 45 in which the circumferential pitch between the thrust resistance stopper fitting portions 43 and 43 is wider than the circumferential pitch between the earthquake resistant stopper fitting portions 40 and 40 is taken as an example. The thrust resistance portion 45 is provided with thrust resistance stopper fitting portions 43, 43 at the same circumferential pitch as the earthquake resistant resistance stopper fitting portions 40, 40, and each stopper metal fitting 44, 44 ... May be intermittently projected at a desired circumferential pitch.

その場合、上述の如く地震動等による大きな外力が作用してスラスト抵抗部45のストッパー金具44,44が破断した際、未使用のストッパー金具44,44を差し込み部37の外周面より突出させることにより、スラスト力に対抗可能な状態に早急に復旧させることができる。   In that case, when a large external force due to seismic motion or the like acts as described above and the stopper fittings 44, 44 of the thrust resistance portion 45 are broken, the unused stopper fittings 44, 44 are projected from the outer peripheral surface of the insertion portion 37. It is possible to quickly recover the state capable of resisting the thrust force.

また、上述の実施例では、各管体に合成鋼管からなる推進管を使用した例について説明したが、各管体はこれに限定されない。   Moreover, although the above-mentioned Example demonstrated the example which used the propulsion pipe which consists of a synthetic steel pipe for each tubular body, each tubular body is not limited to this.

A 地中管路
1 曲線部用管体
2 直線部用管体
3 管路曲線部用耐震離脱防止継手
4 直線部用耐震離脱防止継手
30 外殻鋼管
31 コンクリート層
32,33 端板
34,35 補強用リブ
36 カラー部
37 差し込み部
38 止水パッキン
39 抜け出し防止凸部
40 耐震離脱抵抗用ストッパー嵌合部
41 ストッパー金具
42 耐震離脱抵抗部
43 スラスト抵抗用ストッパー嵌合部
44 ストッパー金具
45 スラスト抵抗部
46 ストッパー部材
47 差し込み部外殻
48 アンカーナット
49 小径部
50 雄ネジ
51 レンチ穴
52 端面クッション材
A Underground pipe 1 Curved tube 2 Straight line tube 3 Seismic detachment prevention joint 4 Curved proof joint 30 Straight steel pipe 31 Concrete layers 32, 33 End plates 34, 35 Reinforcing rib 36 Collar portion 37 Insertion portion 38 Water-proof packing 39 Protrusion prevention convex portion 40 Anti-seismic detachment resistance stopper fitting portion 41 Stopper fitting 42 Anti-seismic detachment resistance portion 43 Thrust resistance stopper fitting portion 44 Stopper fitting 45 Thrust resistance portion 46 Stopper member 47 Insertion portion outer shell 48 Anchor nut 49 Small diameter portion 50 Male screw 51 Wrench hole 52 End cushion

Claims (2)

互いに連結される一方の管体の端面より他方側に突出した筒状のカラー部と、他方の管体の端部に配置され、前記カラー部内に挿入される差し込み部と、前記カラー部の内周面と前記差し込み部の外周面との隙間に介在させた止水パッキンとを備え、前記両管体を離脱不能に接続する耐震離脱防止継手であって、
前記カラー部の内周面にリング状に突出した抜け出し防止凸部を備え、
前記差し込み部には、差し込み方向先端側の外周部に所望の周方向ピッチで半径方向に向けた複数の耐震離脱抵抗用ストッパー嵌合部にそれぞれストッパー金具を移動可能に嵌合させてなる耐震離脱抵抗部と、該耐震離脱抵抗部の差し込み方向手前側に距離を置いて配置され、前記耐震離脱抵抗用ストッパー嵌合部間の周方向ピッチに比べて広い周方向ピッチで半径方向に向けた複数のスラスト抵抗用ストッパー嵌合部にそれぞれストッパー金具を移動可能に嵌合させてなるスラスト抵抗部とを備え、
前記カラー部に前記差し込み部を差し込み、前記差し込み部の外周面より前記各ストッパー金具を突出させ、前記スラスト抵抗部のストッパー金具を前記抜け出し防止凸部と係合させ、前記両管体間に一定以上の力が作用した際には前記スラスト抵抗部のストッパー金具が破断し、前記抜け出し防止用凸部が前記耐震離脱抵抗部側に移動できるようにしたことを特徴とする耐震離脱防止継手。
A cylindrical collar portion projecting from the end face of one tube connected to the other to the other side, an insertion portion disposed at the end of the other tube body and inserted into the collar portion, and an inner portion of the collar portion A seismic detachment preventing joint that includes a water stop packing interposed in a gap between the peripheral surface and the outer peripheral surface of the insertion portion, and connects the two pipe bodies in a non-detachable manner,
The inner peripheral surface of the collar portion is provided with a protrusion preventing protrusion protruding in a ring shape,
Seismic detachment is made by movably fitting stopper fittings to a plurality of seismic detachment resistance stopper fitting portions oriented in a radial direction at a desired circumferential pitch on the outer peripheral portion on the distal end side in the insertion direction. A plurality of resistance portions and a plurality of portions arranged in the radial direction with a wider circumferential pitch than the circumferential pitch between the stopper fitting portions for the seismic detachment resistance , arranged at a distance in front of the seismic detachment resistance portion in the insertion direction. A thrust resistance part formed by movably fitting a stopper fitting to each of the thrust resistance stopper fitting parts,
The insertion portion is inserted into the collar portion, the stopper fittings are protruded from the outer peripheral surface of the insertion portion, the stopper fitting of the thrust resistance portion is engaged with the pull-out prevention convex portion, and is fixed between the two tubular bodies. When the above force is applied, the stopper metal fitting of the thrust resistance portion is broken, and the protrusion for preventing withdrawal can be moved to the side of the earthquake-proof separation resistance portion.
前記耐震離脱抵抗用ストッパー嵌合部及び前記スラスト抵抗用ストッパー嵌合部は、その内周面部に雌ネジを有するアンカーナットを備え、前記ストッパー金具の外周に形成された雄ネジが前記アンカーナットに螺合されるようにした請求項1に記載の耐震離脱防止継手。 The seismic detachment resistance stopper fitting portion and the thrust resistance stopper fitting portion include an anchor nut having a female screw on an inner peripheral surface portion thereof, and a male screw formed on the outer periphery of the stopper fitting is attached to the anchor nut. The earthquake-proof detachment preventing joint according to claim 1 , wherein the joint is screwed.
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JPH04101888U (en) * 1991-02-13 1992-09-02 株式会社クボタ Disengagement prevention pipe fitting
JPH11101377A (en) * 1997-09-29 1999-04-13 Nanno Construction Co Ltd Flexible hume pipe
JP6051471B2 (en) * 2012-07-23 2016-12-27 日本ヒューム株式会社 Detachment prevention pipe joint structure provided on concrete pipe, separation prevention pipe joint method, and concrete pipe using separation prevention pipe joint structure

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