JP6520327B2 - Manufacturing method of joint fitting for segment and joint fitting for segment - Google Patents
Manufacturing method of joint fitting for segment and joint fitting for segment Download PDFInfo
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- JP6520327B2 JP6520327B2 JP2015079452A JP2015079452A JP6520327B2 JP 6520327 B2 JP6520327 B2 JP 6520327B2 JP 2015079452 A JP2015079452 A JP 2015079452A JP 2015079452 A JP2015079452 A JP 2015079452A JP 6520327 B2 JP6520327 B2 JP 6520327B2
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Description
本発明は、トンネルの覆工体を構成するセグメントを連結するためのセグメント用継手金具の製造方法およびセグメント用継手金具に関する。 The present invention relates to a method of manufacturing a joint fitting for a segment for connecting segments constituting a lining of a tunnel, and a joint fitting for a segment.
シールド工法を採用してトンネルを構築する場合、切羽の掘進に応じてその後方にて複数のセグメントをトンネル円周方向に接続してセグメントリングを構成し、このセグメントリングをトンネル軸方向に接続して筒状の覆工体を形成する。そして、セグメントリングをトンネル軸方向に接続するにあたり、その接合面には、リング継手が設けられている。 When constructing a tunnel using the shield method, a segment ring is formed by connecting multiple segments in the tunnel circumferential direction at the rear according to the face drilling, and this segment ring is connected in the tunnel axial direction. Form a tubular lining body. And, in connecting the segment ring in the tunnel axial direction, a ring joint is provided on the joint surface.
例えば、特許文献１に開示されているリング継手は、係合筒を内方に備えた接合筒と、接合棒を有しており、接合棒は、軸部の基端部が一方のセグメントに固定されるとともに、先端部には大径の頭部を有しており、軸部と頭部との間に係合段部が形成されている。また、接合筒は、接合棒の挿入口を他方のセグメントにおける接合面に設けた状態で、セグメント内に埋設されており、接合筒に内包されている係合筒は、基端部が接合筒の内周面に固定され、先端部に向けて漸次縮径するとともに、先端部近傍には軸方向に延びるスリットが複数設けられている。 For example, the ring joint disclosed in Patent Document 1 has a joint cylinder having an engagement cylinder inward and a joint rod, and the joint rod has the proximal end portion of the shaft portion in one segment. It is fixed and has a large diameter head at its tip, and an engagement step is formed between the shaft and the head. Further, the joint cylinder is embedded in the segment with the insertion port of the joint rod provided on the joint surface of the other segment, and the engagement cylinder included in the joint cylinder has a proximal end portion that is a joint cylinder. A plurality of slits are fixed to the inner circumferential surface of the housing and gradually reduce in diameter toward the tip end, and a plurality of slits extending in the axial direction are provided in the vicinity of the tip end.
そして、セグメントリングを接続する際には、接合棒の先端部を接合筒の挿入口に挿入し押力を作用させる。すると、接合棒の頭部が、係合筒の内方にてスリットを広げながら押し進み、係合筒の先端を通過する。これと同時に、スリットが設けられた係合筒の先端は復帰し、その外径が元の縮径状態に戻る。こうして、係合筒の先端が接合棒の係合段部に係合し、両者が結合される点が開示されている And when connecting a segment ring, the front-end | tip part of a joining rod is inserted in the insertion port of a joining cylinder, and pressing force is made to act. Then, the head of the connecting rod pushes forward while spreading the slit inward of the engagement cylinder, and passes the tip of the engagement cylinder. At the same time, the tip of the engagement cylinder provided with the slit returns, and its outer diameter returns to the original reduced diameter state. Thus, it is disclosed that the tip of the engagement tube is engaged with the engagement step of the joint rod and both are coupled.
しかし、特許文献１に記載のリング継手は、製造方法や材質が記載されておらず、スリットや縮径部を有する係合筒を用いてリング継手に必要な引張性能をどのように確保しているのかが明確にされていない。 However, in the ring joint described in Patent Document 1, the manufacturing method and the material are not described, and the tensile performance necessary for the ring joint is secured by using an engagement cylinder having a slit and a reduced diameter portion. It has not been clarified.
また、係合筒に設けられているスリットは、長くすると変形しやすいため接合棒の頭部を挿入しやすいが、係合筒の先端が接合棒の係合段部に係合した状態から、接合棒に引張力を作用させると係合筒が変形や座屈しやすく、リング継手に必要な引張性能が得られない。一方、スリットを短くすると接合棒の頭部を挿入することで係合筒が塑性変形してしまい、接合棒の頭部が係合筒の先端を通過しても、スリットを設けた係合筒の先端は元の径まで復元せず、接合棒の係合段部に十分係合しない。この状態から接合棒に引張力を作用させると、接合棒が係合筒から容易に抜けてしまい、やはりリング継手に必要な引張性能が得られない。 In addition, the slits provided in the engagement cylinder are easily deformed when elongated, so it is easy to insert the head of the joint rod, but from the state where the tip of the engagement cylinder is engaged with the engagement step of the joint rod, When a tensile force is applied to the joint rod, the engagement tube is easily deformed or buckled, and the tensile performance required for the ring joint can not be obtained. On the other hand, if the slit is shortened, the engagement cylinder is plastically deformed by inserting the head of the joint rod, and the engagement cylinder provided with the slit even if the head of the joint rod passes the tip of the engagement cylinder The tip of the bar does not return to its original diameter and does not sufficiently engage with the engagement step of the welding rod. When a tensile force is applied to the joint rod in this state, the joint rod is easily removed from the engagement cylinder, and the tensile performance necessary for the ring joint can not be obtained.
このように、係合筒と接合棒がリング継手として必要な引張性能を発揮するためには、係合筒の先端が、接合棒の係合段部に十分係合するよう良好なスプリングバック性能を保持するとともに、変形や座屈の生じにくい耐力を有するよう、係合筒の材質や製造方法、スリット長等の仕様を明確にする必要がある。 As described above, in order for the engagement cylinder and the joint rod to exhibit the necessary tensile performance as a ring joint, good springback performance so that the tip end of the engagement cylinder fully engages with the engagement step of the joint rod. It is necessary to clarify the specifications such as the material and manufacturing method of the engagement cylinder, the slit length, etc. so as to hold the load resistance and to resist the deformation and buckling.
本発明は、かかる課題に鑑みなされたものであって、その主な目的は、簡略な構成で安価でありつつ、高い引張性能を有するセグメント用継手金具の製造方法およびセグメント用継手金具を提供することである。 The present invention has been made in view of such problems, and its main object is to provide a method of manufacturing a joint fitting for a segment having high tensile performance while having a simple structure and low cost, and a joint fitting for a segment It is.
かかる目的を達成するため本発明のセグメント用継手金具の製造方法は、セグメントのトンネル軸方向に向かい合う端面の一方に設置され、先端部が基端部より縮径された筒体に、その先端部から基端部に向けて複数のスリットが形成されてなるメス金具と、前記向かい合う端面の他方に設置され、先端部に段差部を設けて形成した拡径頭部を備える軸部を有するオス金具とを備え、前記スリットが形成された状態の前記メス金具の先端部に、前記オス金具の前記拡径頭部が通過すると原形に復元するスプリングバック性能を確保するセグメント用継手金具の製造方法であって、前記メス金具が、前記オス金具を挿通可能な内径を有する鋼製筒体を、中間部から先端部に向けてテーパーを設ける加工にて漸次縮径し、該先端部の内径を前記オス金具の前記軸部の径と略同径に形成した後、前記スプリングバック性能を確保するための熱処理加工を施し、その後、前記先端部から基端部に向かうスリットを複数形成することを特徴とする。 In order to achieve the above object, in the method of manufacturing a joint fitting for a segment of the present invention, the tip of the cylindrical member is installed on one of the end faces of the segment facing in the tunnel axial direction and the tip has a diameter reduced from the base Male fitting having a shank including a female fitting having a plurality of slits formed toward the proximal end and a diameter-increased head installed on the other of the opposite end faces and provided with a step at the distal end. And the spring-back performance is restored to the original shape when the diameter-increased head of the male fitting passes the tip of the female fitting in a state in which the slit is formed. The female fitting gradually reduces the diameter of the steel cylindrical body having an inner diameter through which the male fitting can be inserted, by providing a taper from the middle to the tip, and the inner diameter of the tip is O After forming the substantially the same diameter as the diameter of the shaft portion of the metal member, heat treatment process to ensure the spring-back performance, then, characterized by forming a plurality of slits toward the proximal end from the distal end I assume.
また、本発明のセグメント用継手金具の製造方法は、前記メス金具を、前記セグメントのトンネル軸方向に向かい合う端面の一方に表面を露出させて配置されるリング状の端板と、該端板の裏面に基端部が固定され前記メス金具を内包可能な内径を有するアンカー筒体と、により形成された空間内に該アンカー筒体と離間させた状態で配置し、前記メス金具の基端部を前記端板の裏面に固定することを特徴とする。 Further, in the method of manufacturing a joint fitting for a segment according to the present invention, a ring-shaped end plate disposed with the female fitting exposed at one of the end faces facing in the tunnel axial direction of the segment, and the end plate The proximal end portion is fixed to the back surface, and is disposed in a space formed by the anchor cylindrical body having an inner diameter capable of enclosing the female fitting, in a state separated from the anchor cylindrical body, the proximal end portion of the female fitting Is fixed to the back surface of the end plate.
本発明のセグメント用継手金具の製造方法によれば、メス金具を製造する工程で熱処理加工を施すことにより、メス金具の高耐力化が図られるとともに、良好なスプリングバック性能を確保することが可能となり、高い引張性能を有するセグメント用継手を製造することが可能となる。また、スリットを形成する加工の前に熱処理加工を終えることにより、メス金具のスリット形成部分における捻じれ等の変形を回避し、スリットを形成する加工の前にテーパーを設ける加工を終えることにより、スリットの幅を均一に形成することができるため、スリットによる欠損を少なくでき、所定の性能を備えたメス金具を、簡略な方法で安価に製造することが可能となる。 According to the manufacturing method of the joint fitting for segment of the present invention, by performing the heat treatment process in the process of manufacturing the female fitting, it is possible to achieve high proof strength of the female fitting and secure good spring back performance. Thus, it is possible to manufacture a segment joint having high tensile performance. In addition, by finishing the heat treatment before the process of forming the slits, deformation such as twisting in the slit-formed portion of the metal fitting is avoided, and the process of providing the taper before the process of forming the slits is completed. Since the width of the slits can be formed uniformly, it is possible to reduce the number of defects caused by the slits, and to manufacture a female fitting with predetermined performance at a low cost by a simple method.
本発明のセグメント用継手金具は、セグメントのトンネル軸方向に向かい合う端面の一方に設置されたメス金具と、前記向かい合う端面の他方に設置され先端部に段差部を設けて形成された拡径頭部を備える軸部を有するオス金具と、を備えるセグメント用継手金具であって、前記メス金具は、前記オス金具を挿通可能な内径を有する基端部、及び該基端部より縮径されて前記オス金具の前記軸部と略同径の内径を有する先端部を備え、熱処理加工が施された鋼製筒体と、熱処理加工が施された該鋼製筒体の先端部から基端部に向けて形成された複数のスリットと、を備え、前記鋼製筒体の先端部は、熱処理加工により前記スリットが形成された状態で前記オス金具の前記拡径頭部が通過すると原形に復元するスプリングバック性能が確保され、前記鋼製筒体の中間部から先端部に向かうテーパー比が、１／５０以上１／２以下であることを特徴とする。 The joint fitting for a segment according to the present invention is a diameter-increased head formed by providing a stepped portion at the tip of a female fitting installed on one of the end faces facing in the tunnel axial direction of the segment and the other end face facing the opposite direction. A male fitting having a shaft portion comprising: a fitting for a segment, the female fitting having a diameter smaller than a proximal end having an inner diameter through which the male fitting can be inserted and the proximal end; A heat-treated steel cylinder having a tip end having an inner diameter substantially equal to that of the shaft of the male fitting, and a tip end portion to a base end of the heat-treated steel cylinder. A plurality of slits formed facing toward the front end of the steel cylinder restores to the original shape when the enlarged diameter head of the male fitting passes in a state where the slits are formed by heat treatment. Spring back performance secured , Taper ratio toward the tip end portion from an intermediate portion of the steel cylindrical body, characterized in that at 1/50 to 1/2.
本発明のセグメント用継手金具によれば、経済的で、かつセグメント用継手金具に引張力が作用した際にもメス金具に変形や座屈が生じにくい構造とすることが可能となる。 According to the joint fitting for a segment of the present invention, it is possible to make it a structure which is economical and hardly causes deformation or buckling in a female fitting even when a tensile force acts on the joint fitting for segment.
本発明のセグメント用継手金具は、セグメントのトンネル軸方向に向かい合う端面の一方に設置されたメス金具と、前記向かい合う端面の他方に設置され先端部に段差部を設けて形成された拡径頭部を備える軸部を有するオス金具と、を備えるセグメント用継手金具であって、前記メス金具は、前記オス金具を挿通可能な内径を有する基端部、及び該基端部より縮径されて前記オス金具の前記軸部と略同径の内径を有する先端部を備え、熱処理加工が施された鋼製筒体と、熱処理加工が施された該鋼製筒体の先端部から基端部に向けて形成された複数のスリットと、を備え、前記鋼製筒体の先端部は、熱処理加工により前記スリットが形成された状態で前記オス金具の前記拡径頭部が通過すると原形に復元するスプリングバック性能が確保され、前記メス金具のスリット長が、前記鋼製筒体の鋼管厚の５倍以上５０倍以下であることを特徴とする。 The joint fitting for a segment according to the present invention is a diameter-increased head formed by providing a stepped portion at the tip of a female fitting installed on one of the end faces facing in the tunnel axial direction of the segment and the other end face facing the opposite direction. A male fitting having a shaft portion comprising: a fitting for a segment, the female fitting having a diameter smaller than a proximal end having an inner diameter through which the male fitting can be inserted and the proximal end; A heat-treated steel cylinder having a tip end having an inner diameter substantially equal to that of the shaft of the male fitting, and a tip end portion to a base end of the heat-treated steel cylinder. A plurality of slits formed facing toward the front end of the steel cylinder restores to the original shape when the enlarged diameter head of the male fitting passes in a state where the slits are formed by heat treatment. Spring back performance secured , Slit length of the female fitting, characterized in that the steel tubular member is less than 50 times 5 times or more of the steel pipe thickness.
上記のセグメント用継手金具は、オス金具をメス金具に挿入する際の挿入荷重を抑えつつ、セグメント用継手金具に引張力を作用させた際にもメス金具に変形や座屈が生じにくい構造とすることが可能となる。 The segment fitting described above has a structure in which deformation or buckling does not easily occur in the female fitting when tensile force is applied to the segment fitting while suppressing the insertion load when inserting the male fitting into the female fitting. It is possible to
以下に、本発明のセグメント用継手金具１の製造方法およびセグメント用継手金具１を、図１〜図６を用いて説明する。
本発明のセグメント用継手金具１は、複数のセグメント１１をトンネル円周方向に接続して形成したセグメントリングをトンネル軸方向に接続するためのリング継手として用いられるものであって、図１（ａ）で示すように、セグメント１１の切羽側端面１１１にオス金具２、坑口側端面１１２にメス金具５がそれぞれ設置されている。
Below, the manufacturing method of the joint fitting 1 for segments of this invention and the joint fitting 1 for segments are demonstrated using FIGS. 1-6.
The joint fitting 1 for segments of the present invention is used as a ring joint for connecting segment rings formed by connecting a plurality of segments 11 in the circumferential direction of the tunnel in the axial direction of the tunnel, as shown in FIG. As shown in), the male fitting 2 is installed on the face side end face 111 of the segment 11, and the female fitting 5 is installed on the wellhead end face 112.
図１（ｂ）に示すように、オス金具２は、基端部に雄ねじが切られた軸部２１と、軸部２１の先端部に形成され、軸部２１より径の大きい拡径頭部２２と、軸部２１と拡径頭部２２との間に形成された段差部２３とを有している。 As shown in FIG. 1 (b), the male fitting 2 is formed at a shaft 21 with a male screw at its base end and at the tip of the shaft 21, and a diameter-increased head having a larger diameter than the shaft 21. 22 and a step 23 formed between the shaft 21 and the enlarged diameter head 22.
軸部２１に切られた雄ねじは、インサート３の一方の雌ねじに螺合され、インサート３の他方の雌ねじにはアンカーボルト４が螺合されて、アンカーボルト４とインサート３の一部がセグメント１１に埋設されている。こうしてオス金具２は、セグメント１１の切羽側端面１１１から突出し、かつ着脱自在に設置されている。 An external thread cut in the shaft portion 21 is screwed into one internal thread of the insert 3 and an anchor bolt 4 is engaged with the other internal thread of the insert 3 so that a part of the anchor bolt 4 and the insert 3 is a segment 11 Are buried in the Thus, the male fitting 2 protrudes from the face-side end face 111 of the segment 11 and is detachably installed.
一方、図１（ｃ）に示すように、メス金具５は、基端部５１にオス金具２の拡径頭部２２を挿入可能な内径を有するとともに、中間部５２から先端部５３に向けて漸次縮径し、先端部５３にオス金具２の軸部２１と略同径の内径を有する鋼製の筒体よりなる。そして、メス金具５の先端部５３には、基端部５１に向かうスリット５４が複数設けられており、先端部５３における内径の拡大が可能な形状を有している。 On the other hand, as shown in FIG. 1C, the female fitting 5 has an inner diameter that allows insertion of the enlarged diameter head 22 of the male fitting 2 at the base end 51, and from the middle part 52 toward the distal end 53 It diameter-reduces gradually and it consists of a steel-made cylindrical body which has the internal diameter of the axial part 21 of the male fitting 2 in the front-end | tip part 53, and a diameter substantially the same. The distal end portion 53 of the female fitting 5 is provided with a plurality of slits 54 directed to the proximal end portion 51, and has a shape capable of enlarging the inner diameter of the distal end portion 53.
メス金具５は、中央にメス金具５の基端部５１と略同径の開口を備えたリング部材よりなる端板６の裏面に基端部５１を固定されており、端板６の裏面から突出するように設置されている。また、端板６の裏面には、メス金具５を内包可能な内径を有するアンカー筒体７の基端部も溶接固定されて一体化されている。したがって、メス金具５は、アンカー筒体７に全体を覆われる状態となっている。 The base end 51 is fixed to the back surface of the end plate 6 formed of a ring member having an opening having substantially the same diameter as the base end 51 of the end fitting 6 at the center. It is installed to project. Further, on the back surface of the end plate 6, the proximal end portion of the anchor cylinder 7 having an inner diameter capable of containing the female fitting 5 is also welded and integrated. Accordingly, the female fitting 5 is entirely covered by the anchor cylinder 7.
そして、アンカー筒体７の先端部には定着部７１が形成されており、端板６の表面のみがセグメント１１の坑口側端面１１２から露出される状態で、端板６とアンカー筒体７はセグメント１１に埋設されている。こうしてメス金具５は、端板６とアンカー筒体７とにより形成された空間内に配置された状態で、セグメント１１の坑口側端面１１２近傍に埋設されている。 And the fixing part 71 is formed in the front-end | tip part of the anchor cylinder 7, and the end plate 6 and the anchor cylinder 7 are the states in which only the surface of the end plate 6 is exposed from the wellhead side end surface 112 of the segment 11. It is buried in the segment 11. Thus, the female fitting 5 is embedded in the vicinity of the end face 112 on the wellhead side of the segment 11 in a state of being disposed in the space formed by the end plate 6 and the anchor cylinder 7.
なお、メス金具５と端板６との間には、両者を離間させる方向に大きな力が作用することはないため、メス金具５の基端部５１と端板６の裏面との固定手段は特に限定されるものではなく、例えば、点溶接にて固定するものであってもよい。 Since a large force does not act between the female fitting 5 and the end plate 6 in the direction in which they are separated, the means for fixing the proximal end 51 of the female fitting 5 to the back surface of the end plate 6 is It does not specifically limit, For example, you may fix by spot welding.
上述する構成のセグメント用継手金具１は、向かい合うセグメント１１の一方に設置されたメス金具５に対して他方に設置されたオス金具２の位置合わせを行ったうえで、セグメント１１どうしを当接させるよう押力を作用させる。すると、オス金具２の拡径頭部２２は、端板６の開口を介してメス金具５の基端部５１に挿入し、スリット５４の間隔を広げながらメス金具５の内方を押し進む。 The segment fitting fitting 1 having the above-described configuration aligns the male fitting 2 installed on the other with the female fitting 5 installed on one of the facing segments 11, and then brings the segments 11 into contact with each other. To exert pressure. Then, the enlarged diameter head 22 of the male fitting 2 is inserted into the proximal end 51 of the female fitting 5 through the opening of the end plate 6 and pushes the inward of the female fitting 5 while widening the gap of the slits 54.
そして、セグメント１１の切羽側端面１１１からオス継手２の段差部２３までの距離と、セグメント１１の坑口側端面１１２からメス金具５の先端部５３までの距離が、略同一に形成されているため、オス金具２の拡径頭部２２がメス金具５の先端部５３を通過すると、図１（ａ）で示すように、向かい合うセグメント１１の坑口側端面１１２と切羽側端面１１１とが当接する。このとき、メス金具５の先端部５３は、スリット５４の間隔を広げられて拡開されていた状態から原形に弾性復元して縮径状態に戻り、オス金具２の段差部２３と当接する。これにより、オス金具２とメス金具５が結合され、向かい合うセグメント１１どうしも結合されることとなる。 And since the distance from the face side 111 of the face of the segment 11 to the step 23 of the male joint 2 and the distance from the end face 112 of the well of the segment 11 to the tip 53 of the female fitting 5 are substantially the same. When the enlarged diameter head portion 22 of the male fitting 2 passes through the distal end portion 53 of the female fitting 5, as shown in FIG. 1A, the wellhead end face 112 and the face side end face 111 of the facing segment 11 abut. At this time, the distal end portion 53 of the female fitting 5 elastically restores to the original shape from the state where the gap of the slit 54 is expanded and expanded, returns to the reduced diameter state, and abuts on the step 23 of the male fitting 2. As a result, the male fitting 2 and the female fitting 5 are coupled, and the facing segments 11 are also coupled together.
ところで、メス金具５が上記の挙動を示すためには、オス金具２の拡径頭部２２が挿入されてスリット５４の間隔を広げられた際にも塑性変形することがなく、オス金具２の拡径頭部２２がメス金具５の先端部５３を通過した際には復元して先端部５３をオス金具２の段差部２３に対して確実に当接させるべく、良好なスプリングバック性能を持たせるよう、メス金具５を製造する必要がある。 By the way, in order for the female fitting 5 to exhibit the above behavior, plastic deformation does not occur even when the enlarged diameter head 22 of the male fitting 2 is inserted and the distance between the slits 54 is increased. When the enlarged diameter head portion 22 passes through the tip end portion 53 of the female fitting 5, it has good spring back performance so that it can be restored and the tip end portion 53 reliably abuts against the step portion 23 of the male fitting 2. It is necessary to manufacture the female fitting 5 so that the
そこで、本発明ではメス金具５の製造工程において、図２（ａ）に示すようなメス金具５の原材料である鋼製筒体８に対して熱処理加工を施す工程を追加して、塑性変形することのない良好なスプリングバック性能を確保することとした。 Therefore, in the present invention, in the manufacturing process of the female fitting 5, a step of applying heat treatment to the steel cylindrical body 8 which is a raw material of the female fitting 5 as shown in FIG. We decided to ensure an excellent springback performance.
してみると、本発明では、メス金具５を製造するにあたり鋼製筒体８に対して、熱処理を施す加工、鋼製筒体の先端部８３から基端部８１に向けてスリット８４を設ける加工、鋼製筒体８の中間部８２から先端部８３に向けて漸次縮径させるテーパーを設ける加工、の少なくとも３つの加工を施すこととなる。 In the present invention, in manufacturing the female fitting 5, the steel cylinder 8 is subjected to heat treatment, and a slit 84 is provided from the tip end 83 to the base end 81 of the steel cylinder. At least three processes of processing and processing of providing a taper for gradually reducing the diameter from the middle portion 82 of the steel cylinder 8 toward the tip end portion 83 are performed.
しかし、一般に鋼材に熱処理を施すと曲り等の熱処理変形が生じることが知られており、スリット８４を設けた後の鋼製筒体８に熱処理加工を施すと、スリット形成部分である先端部８３に捻じれが生じやすい。また、スリット８４を設けた鋼製筒体８にテーパーを設ける加工を施すと、スリット８４の幅が不揃いとなりやすい、といった課題が生じる。 However, it is known that heat treatment deformation such as bending occurs generally when heat treatment is performed on steel materials, and when heat treatment is performed on the steel cylinder 8 after the slits 84 are provided, the tip portion 83 which is a slit formation portion Twisting is likely to occur. Further, if the steel cylinder 8 provided with the slits 84 is processed to have a taper, there arises a problem that the widths of the slits 84 are likely to be uneven.
そこで、本発明者らは、上記の課題を解決するために鋭意検討し、その結果、メス金具５を製造する方法として、オス金具２の拡径頭部２２が挿入可能な内径を有する鋼製筒体８を、図２（ｂ）に示すように中間部８２から先端部８３に向けてテーパーを設ける加工にて漸次縮径し、先端部８３を前記オス金具２の軸部２１と略同径の内径に縮径した後、図２（ｃ）に示すように熱処理加工を施し、その後、図２（ｄ）に示すように前記先端部８３から中間部８２に向かうスリット８４を複数形成することとした。 Therefore, the present inventors diligently studied to solve the above-mentioned problems, and as a result, as a method of manufacturing the female fitting 5, steel having an inner diameter into which the enlarged diameter head 22 of the male fitting 2 can be inserted As shown in FIG. 2 (b), the diameter of the cylindrical body 8 is gradually reduced by tapering from the intermediate portion 82 toward the distal end portion 83, and the distal end portion 83 is substantially the same as the shaft portion 21 of the male fitting 2. After the diameter is reduced to the inner diameter, heat treatment is performed as shown in FIG. 2C, and then a plurality of slits 84 are formed from the tip 83 toward the intermediate portion 82 as shown in FIG. 2D. I decided.
なお、鋼製筒体８にテーパーを設ける加工を施す際の方法は、なんら限定されるものではなく、従来より用いられているいずれの加工方法を採用してもよい。また、熱処理加工の方法も、鋼材を加熱した後に急冷する焼入れを行った後、焼もどしを行い鋼材に硬さと粘り強さを付与する、従来より実施されている方法を採用するものであり、焼入れ時の加熱温度や冷却速度、焼もどし温度等は、鋼製筒体８の材料等に応じて適宜調整すればよい。なお、鋼製筒体８に対して、熱処理加工が可能な材料を採用することは言うまでもない。 In addition, the method at the time of giving the process which provides the taper to steel cylindrical body 8 is not limited at all, You may employ | adopt any processing method conventionally used. Also, the heat treatment method is a method which is conventionally practiced, in which the steel material is heated and quenched and then quenched and then tempered to impart hardness and toughness to the steel material. The heating temperature, cooling rate, tempering temperature and the like at that time may be appropriately adjusted in accordance with the material of the steel cylinder 8 and the like. Needless to say, a material that can be heat-treated can be used for the steel cylinder 8.
上記の製造方法にて製造したメス金具５の性能を把握するべく、図３〜図４に示すような、メス金具５にオス金具２を挿入する挿入試験、及び、図５〜図６に示すような、メス金具５に挿入された状態のオス金具２の拡径頭部２２に押力を作用させる押込試験を行った。なお、参考例として、熱処理加工を施していないメス金具５を別途製作し、同様の試験を行ってその性能を比較した。 In order to grasp the performance of the female fitting 5 manufactured by the above manufacturing method, an insertion test for inserting the male fitting 2 into the female fitting 5 as shown in FIGS. 3 to 4 and shown in FIGS. A pressing test was performed in which a pressing force was applied to the enlarged diameter head 22 of the male fitting 2 in a state of being inserted into the female fitting 5 as described above. As a reference example, a female fitting 5 not subjected to heat treatment was separately manufactured, and the same test was performed to compare the performance.
挿入試験及び押込試験を行ったメス金具５の供試体は以下の３体であり、いずれも基端部５１の外径５０．８ｍｍ、先端部５３の内径３０．０ｍｍ、鋼管厚４．０ｍｍ、中間部５２から先端部５３に向かうテーパー比１／１２．８、スリット５４の長さ５５ｍｍ（鋼管厚の１３．７５倍）、スリット５４の数量４本に成形されている。
供試体Ａ：ＳＣＭ４３５（機械構造用合金鋼鋼管：クロムモリブデン鋼）
熱処理加工有り、強度区分１０．９相当
供試体Ｂ：ＳＴＫＭ１３Ａ（機械構造用炭素鋼鋼管）
熱処理加工無し
供試体Ｃ：Ｓ４５Ｃ（機械構造用高炭素鋼鋼管）
熱処理加工無し
The following three test pieces of the female fitting 5 were subjected to the insertion test and the indentation test. The outer diameter of the proximal end 51 is 50.8 mm, the inner diameter of the distal end 53 is 30.0 mm, and the steel pipe thickness is 4.0 mm. The taper ratio 1 / 12.8 from the intermediate portion 52 to the tip portion 53, the length of the slit 54 is 55 mm (13.75 times the thickness of the steel pipe), and the number of the slits 54 is four.
Specimen A: SCM 435 (alloy steel pipe for machine structure: chromium molybdenum steel)
With heat treatment processing, strength category 10.9 or equivalent Specimen B: STKM 13A (Carbon steel pipe for machine structure)
No heat treatment processing Specimen C: S45C (high carbon steel pipe for machine structure)
No heat treatment processing
また、試験に用いたオス金具２は、軸部２１の径３０．０ｍｍ、拡径頭部２２の径３８．０ｍｍ、段差部２３の高さ４．０ｍｍで、材質はＳＣＭ４３５（機械構造用合金鋼鋼管：クロムモリブデン鋼）、熱処理加工有り、強度区分１０．９相当である。 The male fitting 2 used in the test has a diameter of 30.0 mm for the shaft 21, a diameter of 38.0 mm for the diameter-expanding head 22, a height of 4.0 mm for the step 23, and is made of SCM435 (alloy for machine structure Steel pipe: Chromium-Molybdenum steel), with heat treatment, equivalent to strength category 10.9.
<挿入試験>
まず、図３に挿入試験の試験方法を示す。
挿入試験は、図３（ａ）に示すように、供試体Ａ〜Ｃをメス金具５として用いたセグメント用継手金具１を、オス金具２の拡径頭部２２が供試体Ａ〜Ｃの内周面に当接するまでオス金具２を供試体Ａ〜Ｃに挿入した状態で、圧縮試験機９にセットする。そして、図３（ｂ）に示すように、オス金具２に対して挿入荷重の付与を開始し、圧縮試験機の間隔の変位Δｌを計測する。挿入試験は、オス金具２の拡径頭部２２が供試体Ａ〜Ｃの先端部５３を通過するまで、挿入荷重の付与を行った。
<Insertion test>
First, FIG. 3 shows a test method of the insertion test.
In the insertion test, as shown in FIG. 3 (a), the joint fitting 1 for segments using the test pieces A to C as the female fitting 5 is used, and the enlarged diameter head 22 of the male fitting 2 is one of the test pieces A to C. The male metal fitting 2 is set in the compression tester 9 in a state of being inserted into the test pieces A to C until it abuts on the circumferential surface. And as shown in FIG.3 (b), provision of an insertion load is started with respect to the male metal fitting 2, and displacement (DELTA) 1 of the space | interval of a compression tester is measured. In the insertion test, the insertion load was applied until the enlarged diameter head 22 of the male fitting 2 passed the tip end portion 53 of the test pieces A to C.
上記の試験方法による挿入試験の結果を図４に示す。
熱処理加工を行った供試体Ａは、図４（ａ）のグラフを見ると、変位が大きくなるに従い、つまり、オス金具２が供試体Ａ内を先端部５３に向けて移動するに従い、挿入荷重が大きくなり、オス金具２が拡径頭部２２にてスリット５４を押し広げながら、２０ｍｍ程度移動している。その後、スリット５４が広がった状態の先端部５３に生じる、スプリングバック性能による元の形状に戻ろうとする力に抗いながら、オス金具２は４０ｍｍ程度まで移動し、４５ｍｍ程度の時点で拡径頭部２２が供試体Ａの先端部５３を通過した様子がわかる。
The results of the insertion test according to the above test method are shown in FIG.
As seen from the graph in FIG. 4A, the specimen A subjected to the heat treatment is an insertion load as the displacement increases, that is, as the male fitting 2 moves toward the tip 53 in the specimen A. The male fitting 2 moves about 20 mm while spreading the slit 54 with the enlarged diameter head 22. Thereafter, the male fitting 2 is moved to about 40 mm while resisting the force to return to the original shape due to the spring back performance generated at the tip part 53 in the state where the slit 54 is expanded. It can be seen that 22 passes through the tip 53 of the specimen A.
このように、図４（ａ）に示すグラフにおいて、熱処理加工を行った供試体Ａは、オス金具２の拡径頭部２２が挿入されたことにより、オス金具２の拡径頭部２２が供試体Ａの先端部５３を通過した際には、供試体Ａの先端部５３が復元する様子が再現されている。なお、挿入試験の終了後、供試体Ａの先端部５３が、試験前の形状に復元している状態を目視確認している。 Thus, in the graph shown in FIG. 4A, the specimen A subjected to the heat treatment processing has the enlarged diameter head 22 of the male metal fitting 2 by the insertion of the enlarged diameter head 22 of the male metal fitting 2. When passing through the tip portion 53 of the specimen A, a state in which the tip portion 53 of the specimen A is restored is reproduced. In addition, after completion | finish of an insertion test, the state where the front-end | tip part 53 of the specimen A decompress | restores to the shape before a test is visually confirmed.
一方、熱処理加工を行っていない供試体Ｂおよび供試体Ｃは、図４（ａ）を見ると、オス金具２が拡径頭部２２にてスリット５４を押し広げつつ５ｍｍ程度まで移動しているものの、それ以降は、挿入荷重が減少しながらもオス金具２は移動し続け、４０ｍｍ以上移動した後に、拡径頭部２２が供試体Ｂおよび供試体Ｃの先端部５３を通過した様子がわかる。 On the other hand, in the specimens B and C which have not been heat-treated, the male metal fitting 2 moves about 5 mm while spreading the slit 54 with the enlarged diameter head 22 as seen in FIG. 4A. However, after that, it can be seen that the male fitting 2 continues to move while the insertion load decreases, and after moving 40 mm or more, the enlarged diameter head 22 passes through the tip portion 53 of the specimen B and the specimen C .
このように、図４（ａ）に示すグラフにおいて、熱処理加工を行っていない供試体Ｂおよび供試体Ｃは、オス金具２の拡径頭部２２がスリット５４の間隔を広げながら５ｍｍ程度移動したところで塑性変形してスリット５４が広がったままの状態となり、その後、供試体Ｂおよび供試体Ｃのスプリングバック性能はほぼ消失している様子が再現されている。 Thus, in the graph shown in FIG. 4 (a), the specimen B and the specimen C which were not subjected to heat treatment moved about 5 mm while the diameter-increased head 22 of the male fitting 2 widened the slit 54. By the way, it is plastically deformed and the slit 54 is in a spread state, and thereafter, the state in which the spring back performance of the specimen B and the specimen C almost disappears is reproduced.
図４（ｂ）で示した挿入試験終了後の供試体Ｂの写真を見ると、供試体Ｂであるメス金具５が塑性変形してスリット５４が開いたままの状態となっており、先端部５３が試験前の外径まで弾性復元していないことが目視確認できる。また、図４（ｃ）で示した挿入試験終了後の供試体Ｃの写真も同様に、供試体Ｃであるメス金具５が塑性変形してスリット５４が開いたままの状態となっていることが目視確認できる。 Looking at the photograph of the specimen B after the end of the insertion test shown in FIG. 4 (b), the female fitting 5 which is the specimen B is plastically deformed and the slit 54 remains open, and the tip end portion It can be visually confirmed that 53 did not elastically recover to the outer diameter before the test. Similarly, in the photograph of the test piece C after the end of the insertion test shown in FIG. 4 (c), the female fitting 5 which is the test piece C is plastically deformed so that the slit 54 remains open. Can be checked visually.
<押込試験>
次に、図５に押込試験の試験方法を示す。
押込試験は、図５に示すように、供試体Ａ〜Ｃをメス金具５として用いたセグメント用継手金具１を、供試体Ａ〜Ｃとオス金具２が結合した状態で、圧縮試験機９にセットする。そして、オス金具２の拡径頭部２２に対して押込荷重の付与を開始し、圧縮試験機の間隔の変位Δｌを計測する。押込試験は、供試体Ａ〜Ｃとオス金具２の結合状態が失われるまで、押込荷重の付与を行った。
<Indentation test>
Next, FIG. 5 shows a test method of the indentation test.
In the indentation test, as shown in FIG. 5, the joint fitting 1 for a segment using the specimens A to C as the female fitting 5 is attached to the compression testing machine 9 in a state where the specimens A to C and the male fitting 2 are joined. set. Then, the application of the pressing load to the enlarged diameter head 22 of the male fitting 2 is started, and the displacement Δl of the interval of the compression tester is measured. In the indentation test, the indentation load was applied until the bonded state of the test pieces A to C and the male metal fitting 2 was lost.
上記の試験方法による押込試験の結果を図６に示す。
熱処理加工を行った供試体Ａは、図６（ａ）のグラフをみると、変位が大きくなるに従い、つまり、オス金具２の拡径頭部２２が供試体Ａに押し込まれるに従い押込荷重が急上昇し、２．５ｍｍ程度押し込まれた時点で挿入荷重が約６００ｋＮと最大になり、その後、挿入荷重がほぼ横ばいのまま４ｍｍ程度まで押し込まれた後、供試体Ａとオス金具２の結合状態が失われた様子がわかる。
The results of the indentation test according to the above test method are shown in FIG.
As seen from the graph in FIG. 6A, the specimen A subjected to the heat treatment processing has a sharp increase in the pressing load as the displacement increases, that is, as the diameter-increased head 22 of the male fitting 2 is pushed into the specimen A. The insertion load reaches a maximum of about 600 kN when it is pushed about 2.5 mm, and after the insertion load is pushed to about 4 mm with almost the same level, the bonding state of specimen A and male fitting 2 is lost I understand how it was.
図６（ｂ）で示した押込試験終了後の供試体Ａの写真をみると、供試体Ａのスリット５４に開きが認められず、先端部５３の座屈も生じていないことから、供試体Ａは健全な状態であることがわかる。一方で、オス金具２の段差部２３には、角部にめくれ等の塑性変形が認められることから、供試体Ａとオス金具２の結合状態が失われた原因は、供試体Ａではなくオス金具２の塑性変形であることは明らかである。 Looking at the photograph of the specimen A after the end of the indentation test shown in FIG. 6 (b), no opening is recognized in the slit 54 of the specimen A and no buckling of the tip 53 occurs, so the specimen It turns out that A is in a healthy state. On the other hand, since plastic deformation such as turning over is observed at the corner portion of the step portion 23 of the male fitting 2, the cause of the loss of the bonding state of the sample A and the male fitting 2 is not male but sample A It is obvious that this is plastic deformation of the metal fitting 2.
一方、図６（ａ）を見ると、熱処理加工を行っていない供試体Ｃは、変位が大きくなっても、つまり、オス金具２の拡径頭部２２が供試体Ｂに押し込まれる量が増加しても、押込荷重の上昇量は小さく、１．５ｍｍ程度押し込まれた時点で挿入荷重が約１５０ｋＮと最大となるが、熱処理加工を行った供試体Ａの場合と比較して最大荷重は１/４程度と小さい。その後、挿入荷重が緩やかに減少しながら変位量は大きくなり、押込荷重がほぼ０となる様子がわかる。 On the other hand, as shown in FIG. 6A, the specimen C not subjected to heat treatment has an increase in the amount by which the diameter-increased head 22 of the male fitting 2 is pushed into the specimen B even if the displacement increases. However, the amount of increase in indentation load is small, and the insertion load reaches a maximum of about 150 kN when it is indented by about 1.5 mm, but the maximum load is 1 compared to the case of specimen A subjected to heat treatment. It is as small as 4/4. After that, it can be seen that the displacement amount increases while the insertion load gradually decreases, and the indentation load becomes almost zero.
同じく熱処理加工を行っていない供試体Ｂにいたっては、押込荷重の最大値が１００ｋＮにも満たないまま、変位のみが大きくなり、押込荷重がほぼ０となる様子がわかる。 Similarly, in the case of the specimen B which is not heat-treated, it can be seen that only the displacement increases and the indentation load becomes almost 0 while the maximum value of the indentation load is less than 100 kN.
図６（ｃ）で示した押込試験終了後の供試体Ｂの写真、及び図６（ｄ）で示した押込試験終了後の供試体Ｃの写真を見ると、供試体Ｂおよび供試体Ｃのスリット５４が大きく開き、オス金具２の拡径頭部２２が供試体Ｂおよび供試体Ｃの内方に没している様子が認められる。したがって、押込荷重を付与した早期の段階で、供試体Ｂおよび供試体Ｃが塑性変形してスリット５４が開いたままとなってオス金具２が抜けてしまい、供試体Ｂおよび供試体Ｃとオス金具２の結合状態が失われた様子がわかる。 The photograph of the specimen B after the end of the indentation test shown in FIG. 6 (c) and the photograph of the specimen C after the end of the indentation test shown in FIG. 6 (d) It can be seen that the slit 54 is widely opened, and the enlarged diameter head 22 of the male fitting 2 is sunk inward of the specimen B and the specimen C. Therefore, at an early stage when the indentation load is applied, the specimen B and the specimen C are plastically deformed, the slit 54 is kept open, and the male fitting 2 is pulled out, so the specimen B and the specimen C and the male It can be seen that the connection of the fitting 2 is lost.
以上のとおり、挿入試験の結果から、熱処理加工を行わない供試体Ｂ及び供試体Ｃは、オス金具２が挿入されると塑性変形してスリット５４が広がったままの状態となり、その後、スプリングバック性能はほぼ消失してしまうため、供試体Ｂ及び供試体Ｃの先端部５３とオス金具２の段差部２３とが当接する結合状態を形成できない。 As described above, according to the results of the insertion test, when the male fitting 2 is inserted, the specimen B and the specimen C which are not heat-treated are plastically deformed and the slit 54 is in a spread state, and then springback Since the performance almost disappears, it is not possible to form a coupled state in which the tip portions 53 of the test pieces B and C and the step portion 23 of the male fitting 2 abut.
一方、熱処理加工を行った供試体Ａは、オス金具２が挿入されるとスリット５４の間隔が広がるものの塑性変形することなく、先端部５３はスプリングバック性能により弾性復元するため、供試体Ａの先端部５３とオス金具２の段差部２３が当接し、良好な結合状態が得られることは明らかである。 On the other hand, the specimen A which has been subjected to the heat treatment process expands the distance between the slits 54 when the male fitting 2 is inserted, but the tip 53 is elastically restored by the spring back performance without plastic deformation. It is apparent that the end portion 53 and the step portion 23 of the male fitting 2 abut each other, and a good coupled state can be obtained.
また、押込試験の結果から、結合状態の供試体Ｂ及び供試体Ｃとオス金具２において、オス金具２を供試体Ｂ及び供試体Ｃに押し込むと、供試体Ｂ及び供試体Ｃが塑性変形してスリット５４が開いたままの状態となってオス金具２が抜けてしまうため、結合状態を維持できない。 Also, from the results of the indentation test, when male fitting 2 is pressed into test piece B and test piece C in test piece B and test piece C and male fitting 2 in a bonded state, test piece B and test piece C are plastically deformed Thus, the male metal fitting 2 is removed with the slit 54 kept open, so that the coupled state can not be maintained.
一方、結合状態の供試体Ａとオス金具２において、オス金具２を供試体Ａに押し込んだ場合にも、供試体Ａは健全な状態であり、オス金具２の塑性変形が生じるまで、結合状態を維持できることは明らかである。 On the other hand, in the coupled state of the specimen A and the male fitting 2, even when the male fitting 2 is pushed into the sample A, the specimen A is in a healthy state and the coupled state until plastic deformation of the male fitting 2 occurs. It is clear that we can maintain
このように、メス金具５を製造する工程で熱処理加工を施すことにより、高耐力化が図られるとともに、良好なスプリングバック性能を確保することができ、セグメント式継手金具に高い引張性能をもたらすことが可能となる。 As described above, by performing heat treatment processing in the process of manufacturing the female fitting 5, high resistance can be achieved, and good spring back performance can be ensured, and high tensile performance can be provided to the segment type joint fitting. Is possible.
また、メス金具５を製造するに際し、スリット５４を形成する加工の前に熱処理加工を終えることにより、スリット５４の形成部分である先端部５３に対して捻じれ等の変形を回避することが可能となる。また、スリット５４を形成する加工の前にメス金具５にテーパーを設ける加工を終えることにより、スリット５４の幅を均一に形成することができる。これにより、スリットによる欠損を少なくでき、所定の性能を備えたメス金具を、簡略な方法で安価に製造することが可能となる。 Further, when manufacturing the female fitting 5, by finishing the heat treatment before the process of forming the slits 54, it is possible to avoid deformation such as twisting of the end portion 53 which is the portion of the slits 54 formed. It becomes. Moreover, the width | variety of the slit 54 can be uniformly formed by finishing the process which provides taper to the knife 5 before the process which forms the slit 54. FIG. As a result, it is possible to reduce the loss due to the slits, and to manufacture a female fitting with predetermined performance at a low cost by a simple method.
なお、本実施の形態では、メス金具５における中間部５２から先端部５３に向かうテーパーのテーパー比を１/１２．８としたが、必ずしもこの数値に限定されるものではない。発明者の知見から、メス金具５を製造する工程で熱処理加工を施した場合において、テーパー比は１/５０以上１/２以下が好ましく、１/１０が構造的・経済的により好ましい。これは、１/２より大きいと、セグメント用継手金具１に引張荷重を作用させた際に、メス金具５の先端部５３が変形しやすく、１/５０より小さいとメス金具５の先端部５３が変形しにくいものの、メス金具５が長くなり経済性に劣るためである。 In the present embodiment, although the taper ratio of the taper from the middle portion 52 to the tip portion 53 in the female fitting 5 is 1 / 12.8, the present invention is not necessarily limited to this numerical value. From the knowledge of the inventor, when heat treatment is performed in the step of manufacturing the metal fitting 5, the taper ratio is preferably 1/50 or more and 1/2 or less, and 1/10 is structurally and economically more preferable. When the tensile load is applied to the joint fitting 1 for segments, if it is larger than 1/2, the tip 53 of the female fitting 5 is easily deformed, and if smaller than 1/50, the tip 53 of the female fitting 5 Although it is difficult to deform, the female fitting 5 becomes long and is not economical.
また、本実施の形態では、メス金具５のスリット５４の長さを５５ｍｍとし、メス金具５の肉厚の約１４倍に設定したが、必ずしもこの数値に限定されるものではない。発明者の知見から、メス金具５を製造する工程で熱処理加工を施した場合において、スリット長はメス金具５の肉厚の５倍以上５０倍以下が好ましく、メス金具５の鋼管厚の１０倍以上１５倍以下が構造的・経済的により好ましい。これは、５倍より小さいと、オス金具２の拡径頭部２２をメス金具５に挿入した際に、スリット５４が効率よく開かず過大な挿入荷重が必要となり、また、塑性化により十分なスプリングバック性能が得られない。また、５０倍より大きいと、オス金具２の拡径頭部２２をメス金具５に挿入する際の挿入荷重は小さくなるものの、セグメント用継手金具１に引張荷重を作用させた際に、メス金具５の先端５３が座屈しやすいためである。 Further, in the present embodiment, the length of the slit 54 of the female fitting 5 is 55 mm, which is about 14 times the thickness of the female fitting 5, but the present invention is not necessarily limited to this value. From the knowledge of the inventor, when heat treatment is performed in the process of producing the female fitting 5, the slit length is preferably 5 times to 50 times the thickness of the female fitting 5 and 10 times the steel pipe thickness of the female fitting 5. More than 15 times is preferable structurally and economically. If this is smaller than 5 times, when inserting the enlarged diameter head 22 of the male fitting 2 into the female fitting 5, the slit 54 does not open efficiently and an excessive insertion load is required, and the plasticization is sufficient. Spring back performance can not be obtained. Moreover, although the insertion load at the time of inserting the diameter-expanding head 22 of the male fitting 2 into the female fitting 5 will become small if larger than 50 times, when making a tensile load act on the joint fitting 1 for segments, female fitting This is because the tip 53 of 5 is easily buckled.
なお、本発明のセグメント用継手金具１の製造方法およびセグメント用継手金具１は、上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更が可能である。 In addition, the manufacturing method of the joint fitting 1 for segments of this invention and the joint fitting 1 for segments are not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention.
例えば、本実施の形態では、メス金具５に対してスリット５４を４本設けたが、その数量は３本以上であれば、いずれの数量を採用してもよい。 For example, in the present embodiment, four slits 54 are provided for the female fitting 5. However, as long as the number is three or more, any number may be adopted.
また、メス金具５の原材料となる鋼製筒体８の材質も、ＳＣＭ４３５に限定されるものではなく、熱処理加工が可能な材料であって所望の耐力を得られる材質であれば、いずれを採用してもよい。 Further, the material of the steel cylindrical body 8 which is a raw material of the female fitting 5 is not limited to SCM 435, and any material which can be heat-treated and can obtain a desired yield strength is adopted. You may
１ セグメント用継手金具
２ オス金具
２１ 軸部
２２ 拡径頭部
２３ 段差部
３ インサート
４ アンカーボルト
５ メス金具
５１ 基端部
５２ 中間部
５３ 先端部
５４ スリット
６ 端板
７ アンカー筒体
７１ 定着部
８ 鋼製筒体
８１ 基端部
８２ 中間部
８３ 先端部
９ 圧縮試験機
１０ 引張試験機
１１ セグメント
１１１ 切羽側端面
１１２ 坑口側端面
1 segment joint fitting 2 male fitting 21 shaft 22 enlarged diameter head 23 step 3 insert 4 anchor bolt 5 female fitting 51 base end 52 middle part 53 tip 54 slit 6 end plate 7 anchor cylinder 71 fixing part 8 Steel cylinder 81 Base end 82 Middle part 83 Tip part 9 Compression tester 10 Tensile tester 11 Segment 111 Face side end face 112 Wellhead end face
Claims (4)
前記スリットが形成された状態の前記メス金具の先端部に、前記オス金具の前記拡径頭部が通過すると原形に復元するスプリングバック性能を確保するセグメント用継手金具の製造方法であって、
前記メス金具が、前記オス金具を挿通可能な内径を有する鋼製筒体を、中間部から先端部に向けてテーパーを設ける加工にて漸次縮径し、該先端部の内径を前記オス金具の前記軸部の径と略同径に形成した後、前記スプリングバック性能を確保するための熱処理加工を施し、その後、前記先端部から基端部に向かうスリットを複数形成することを特徴とするセグメント用継手金具の製造方法。 A female fitting that is installed on one of the end faces facing in the tunnel axial direction of the segment and in which the distal end is reduced in diameter from the proximal end, a plurality of slits being formed from the distal end toward the proximal end And a male fitting having a shaft portion provided with a diameter-increased head, which is installed on the other of the facing end surfaces and provided with a stepped portion at the tip end portion ,
It is a manufacturing method of the joint fitting for segments which secures the spring back performance which restores to original shape when the above-mentioned enlarged diameter head of the male fitting passes the tip part of the female fitting in the state where the slit was formed ,
The female fitting gradually reduces the diameter of the steel cylindrical body having an inner diameter through which the male fitting can be inserted, by providing a taper from the middle part to the tip, and the inner diameter of the tip is After forming the shaft portion to have substantially the same diameter as that of the shaft portion, heat treatment processing is performed to secure the spring back performance , and then, a plurality of slits are formed from the distal end portion toward the proximal end portion. Manufacturing method of joint fitting for segment.
前記メス金具を、前記セグメントのトンネル軸方向に向かい合う端面の一方に表面を露出させて配置されるリング状の端板と、該端板の裏面に基端部が固定され前記メス金具を内包可能な内径を有するアンカー筒体と、により形成された空間内に該アンカー筒体と離間させた状態で配置し、
前記メス金具の基端部を前記端板の裏面に固定することを特徴とするセグメント用継手金具の製造方法。 In the manufacturing method of the joint fitting for segment according to claim 1,
A ring-shaped end plate arranged with the surface exposed on one of the end faces of the segments facing in the tunnel axis direction, and a base end portion fixed to the back surface of the end plate, and the female metal fitting can be contained In a space formed by the anchor cylinder having a different inner diameter, in a state of being separated from the anchor cylinder,
The manufacturing method of the joint fitting for segments characterized by fixing the base end part of the said female fitting to the back surface of the said end plate .
前記メス金具は、
前記オス金具を挿通可能な内径を有する基端部、及び該基端部より縮径されて前記オス金具の前記軸部と略同径の内径を有する先端部を備え、熱処理加工が施された鋼製筒体と、
熱処理加工が施された該鋼製筒体の先端部から基端部に向けて形成された複数のスリットと、を備え、
前記鋼製筒体の先端部は、熱処理加工により前記スリットが形成された状態で前記オス金具の前記拡径頭部が通過すると原形に復元するスプリングバック性能が確保され、
前記鋼製筒体の中間部から先端部に向かうテーパー比が、１／５０以上１／２以下であることを特徴とするセグメント用継手金具。 A female fitting provided on one of the end faces facing in the tunnel axial direction of the segment; and a male fitting having a shaft part provided with a diameter-increased head provided on the other end of the facing end face and providing a step at the tip end A joint fitting for a segment comprising
The female fitting is
The base end portion having an inner diameter through which the male metal fitting can be inserted, and the tip end portion having an inner diameter substantially the same as the shaft portion of the male metal fitting and having a diameter reduced from the base end portion Steel cylinder,
And a plurality of slits formed from the front end to the base end of the heat-treated steel cylinder;
The tip end portion of the steel cylindrical body secures a spring back performance of restoring to an original shape when the enlarged diameter head of the male fitting passes in a state where the slit is formed by heat treatment.
A segment fitting fitting characterized in that a taper ratio from the middle part to the tip part of the steel cylinder is 1/50 or more and 1/2 or less.
前記メス金具は、
前記オス金具を挿通可能な内径を有する基端部、及び該基端部より縮径されて前記オス金具の前記軸部と略同径の内径を有する先端部を備え、熱処理加工が施された鋼製筒体と、
熱処理加工が施された該鋼製筒体の先端部から基端部に向けて形成された複数のスリットと、を備え、
前記鋼製筒体の先端部は、熱処理加工により前記スリットが形成された状態で前記オス金具の前記拡径頭部が通過すると原形に復元するスプリングバック性能が確保され、
前記メス金具のスリット長が、前記鋼製筒体の鋼管厚の５倍以上５０倍以下であることを特徴とするセグメント用継手金具。 A female fitting provided on one of the end faces facing in the tunnel axial direction of the segment; and a male fitting having a shaft part provided with a diameter-increased head provided on the other end of the facing end face and providing a step at the tip end A joint fitting for a segment comprising
The female fitting is
The base end portion having an inner diameter through which the male metal fitting can be inserted, and the tip end portion having an inner diameter substantially the same as the shaft portion of the male metal fitting and having a diameter reduced from the base end portion Steel cylinder,
And a plurality of slits formed from the front end to the base end of the heat-treated steel cylinder;
The tip end portion of the steel cylindrical body secures a spring back performance of restoring to an original shape when the enlarged diameter head of the male fitting passes in a state where the slit is formed by heat treatment.
A joint fitting for a segment, wherein a slit length of the female fitting is 5 times or more and 50 times or less of a thickness of a steel pipe of the steel cylinder.
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