JP2009102845A - Connection structure between natural ground reinforcing steel pipes - Google Patents

Connection structure between natural ground reinforcing steel pipes Download PDF

Info

Publication number
JP2009102845A
JP2009102845A JP2007274024A JP2007274024A JP2009102845A JP 2009102845 A JP2009102845 A JP 2009102845A JP 2007274024 A JP2007274024 A JP 2007274024A JP 2007274024 A JP2007274024 A JP 2007274024A JP 2009102845 A JP2009102845 A JP 2009102845A
Authority
JP
Japan
Prior art keywords
steel pipe
joint
hole
inner flange
wall portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2007274024A
Other languages
Japanese (ja)
Inventor
Satoru Sato
哲 佐藤
Takumi Yasunaga
巧 安永
Daisuke Mimura
大輔 三村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Higashio Mech Co Ltd
Original Assignee
Nippon Steel Corp
Higashio Mech Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp, Higashio Mech Co Ltd filed Critical Nippon Steel Corp
Priority to JP2007274024A priority Critical patent/JP2009102845A/en
Publication of JP2009102845A publication Critical patent/JP2009102845A/en
Pending legal-status Critical Current

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure which facilitates connection between natural ground reinforcing steel pipes. <P>SOLUTION: According to the connection structure, a plurality of slender slits 61 are formed in an end 2 of the natural ground reinforcing steel pipe 1 in a manner extending from a most distal end 60 in a longitudinal direction, and a plurality of radial holes 63 are also formed in the same. A joint 3 has an inner flange 10 formed at an axially intermediate location, which inner flange 10 has circumferential grooves 13 formed therein into which the ends 2 of the steel pipes 1 are inserted. Further the joint has a plurality of support protruded pieces 70 and a connection wall portion 74. The support protruded pieces 70 are erected from the inner flange 10 so as to be opposed to inner peripheral surfaces 2a of the ends 2 of the steel pipes 1 when the ends 2 of the steel pipes 1 are inserted into the circumferential grooves 13. The connection wall portion 74 is inserted into the slender slit 61, and formed so as to connect between an inner peripheral surface 11 of the joint 3 and a predetermined number of outer peripheral surfaces 70a of the support projection pieces 70 out of the whole support projection pieces 70. Furthermore the joint 3 has screw holes 51 bored in the remaining support protruded pieces 70, and through-holes 50 formed in a cylindrical wall portion 12 thereof in a manner coaxial with the screw holes 51, and spiral rods 90 are screwed into the through-holes 50, the radial holes 63, and the screw holes 51, respectively, in a skewered state to fix the same to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、地山補強用鋼管の連結構造に係り、具体的には、例えば、トンネル断面の掘削に先立って、地山補強用の先受け工として切羽の上方に打設する地山補強用鋼管を順次連結する構造に関する。   The present invention relates to a connection structure of steel pipes for reinforcing natural ground. Specifically, for example, prior to excavation of a cross-section of a tunnel, for reinforcing natural ground, which is placed above a face as a receiving work for reinforcing natural ground. The present invention relates to a structure for sequentially connecting steel pipes.

従来、このようなトンネルの掘削に先立って打設される鋼管(有孔管)の長さを延長するために、溶接にて一体状に連結したり、あるいは、鋼管端部外周面にネジを形成し、内部にネジ孔を有するジョイント(短筒体)にて、連結していた(例えば、特許文献1参照)。
特開2006−97272号公報
Conventionally, in order to extend the length of a steel pipe (perforated pipe) to be cast prior to excavation of such a tunnel, it is connected integrally by welding, or a screw is attached to the outer peripheral surface of the steel pipe end. It was formed and connected by a joint (short cylindrical body) having a screw hole inside (see, for example, Patent Document 1).
JP 2006-97272 A

しかし、2本の鋼管(有孔管)を溶接にて連結するには連結作業に時間がかかったり、溶接作業者の技術によって溶接強度等にばらつきがある問題があった。また、溶接に必要な電力を確保したり、施工現場に溶接機を運び込んだりしなければならず、面倒であり、また、火災の虞れもあった。また、上記特許文献1のものでは、螺退方向の回転トルクが作用した場合に、鋼管相互のジョイントが分離する虞もあり、あるいは、強度的に不安があった。   However, it takes time to connect two steel pipes (perforated pipes) by welding, and there is a problem that the welding strength varies depending on the technique of the welding operator. In addition, it is necessary to secure electric power necessary for welding or to bring a welding machine to the construction site, which is troublesome and may cause a fire. Moreover, in the thing of the said patent document 1, when the rotational torque of a screwing direction acts, there exists a possibility that the joint of steel pipes may isolate | separate, or there was uneasiness in intensity | strength.

そこで、本発明は、容易に鋼管を連結することのできる鋼管連結構造を提供することを目的とする。さらに、溶接やネジ結合の連結構造に比べて、鋼管の薄肉化を図ることを、他の目的とする。   Then, an object of this invention is to provide the steel pipe connection structure which can connect a steel pipe easily. Furthermore, it is another object to reduce the thickness of the steel pipe as compared with a connection structure of welding or screw connection.

そこで、本発明に係る地山補強用鋼管の連結構造は、2本の円管状の地山補強用鋼管の端部を、短筒状のジョイントにて、相互に連結する連結構造であって、上記鋼管の端部に、最端縁部から長手方向へ細長状スリットを複数形成すると共に、ラジアル孔を複数形成し、さらに上記ジョイントが、軸心方向中間部に内フランジを有し、該内フランジには上記鋼管の端部が差込まれる周状凹溝が形成され、かつ、上記鋼管の端部が上記周状凹溝に差込まれた状態で上記鋼管の端部の内周面に対向する複数の支持突片を上記内フランジから起立状として設け、上記細長状スリットに差し込まれる連結壁部を上記ジョイントの内周面と上記支持突片の内の所定数のものの外周面を連結するように形成し、さらに、残りの上記支持突片に螺合孔を貫設し、かつ、該螺合孔と同一軸心上に上記ジョイントの筒壁部に貫通孔を形成し、ネジ杆体を該貫通孔と上記ラジアル孔と上記螺合孔に串挿状として螺着して、固着されるものである。   Therefore, the connection structure of the steel pipe for reinforcing natural ground according to the present invention is a connection structure for connecting the ends of two circular tubular steel pipes for reinforcing natural ground with each other by a short cylindrical joint, At the end of the steel pipe, a plurality of elongated slits are formed in the longitudinal direction from the outermost edge portion, a plurality of radial holes are formed, and the joint further includes an inner flange at an axially intermediate portion, The flange is formed with a circumferential concave groove into which the end of the steel pipe is inserted, and the end of the steel pipe is inserted into the circumferential concave groove on the inner peripheral surface of the end of the steel pipe. A plurality of opposing support protrusions are provided upright from the inner flange, and a connection wall portion inserted into the elongated slit is connected to the inner peripheral surface of the joint and the outer peripheral surface of a predetermined number of the support protrusions. In addition, the remaining support protrusions are threaded with holes. In addition, a through hole is formed in the cylindrical wall portion of the joint on the same axis as the screw hole, and a screw housing is screwed into the through hole, the radial hole, and the screw hole as a skewer. , It is fixed.

また、本発明に係る地山補強用鋼管の連結構造は、2本の円管状の地山補強用鋼管の端部を、短筒状のジョイントにて、相互に連結する連結構造であって、上記鋼管の端部に、最端縁部から長手方向へ細長状スリットを形成すると共に、該細長状スリットと180°反対側の上記端部にラジアル孔を形成し、さらに、上記ジョイントが、軸心方向中間部に内フランジを有し、該内フランジには上記鋼管の端部が差込まれる周状凹溝が形成され、かつ、上記鋼管の端部が上記周状凹溝に差込まれた状態で上記鋼管の端部の内周面に対向する一対の支持突片を180°の対称位置に上記内フランジから起立状として設け、上記細長状スリットに差込まれる連結壁部が上記ジョイントの内周面と一つの上記支持突片の外周面を連結するように形成し、残りの上記支持突片に螺合孔を貫設し、かつ、該螺合孔を同一軸心上に上記ジョイントの筒壁部に貫通孔を形成し、ネジ杆体を該貫通孔と上記ラジアル孔と上記螺合孔に串挿状として螺着して、固着されるものである。   Moreover, the connection structure of the steel pipe for reinforcing natural ground according to the present invention is a connection structure for connecting the ends of two circular tubular steel pipes for reinforcing natural ground with each other by a short cylindrical joint, At the end of the steel pipe, an elongated slit is formed in the longitudinal direction from the outermost edge, and a radial hole is formed at the end opposite to the elongated slit at 180 °. The inner flange has an inner flange, and the inner flange is formed with a circumferential groove into which the end of the steel pipe is inserted, and the end of the steel pipe is inserted into the circumferential groove. A pair of supporting protrusions facing the inner peripheral surface of the end portion of the steel pipe in a state of standing are provided upright from the inner flange at a symmetrical position of 180 °, and the connecting wall portion inserted into the elongated slit is the joint Formed so as to connect the inner peripheral surface of the outer peripheral surface and the outer peripheral surface of one of the above-mentioned supporting protrusions Screw holes are formed through the remaining support protrusions, and through holes are formed in the cylindrical wall portion of the joint on the same axis, and a screw housing is formed between the through holes and the radial holes. And screwed into the screw hole as a skewer and fixed.

また、本発明に係る地山補強用鋼管の連結構造は、2本の円管状の地山補強用鋼管の端部を、短筒状のジョイントにて、相互に連結する連結構造であって、上記鋼管の端部に、最端縁部から長手方向へ細長状スリットを複数形成すると共に、該細長状スリットの側端縁から円周方向へ横切欠部を形成し、さらに、上記ジョイントが、軸心方向中間部に内フランジを有し、該内フランジには上記鋼管の端部が差込まれる周状凹溝が形成され、かつ、上記鋼管の端部が上記周状凹溝に差込まれた状態で上記鋼管の端部の内周面に対向する複数の支持突片を上記内フランジから起立状として設け、上記細長状スリットに差込まれる連結壁部を上記ジョイントの内周面と複数の上記支持突片の外周面を連結するように形成すると共に、螺合孔を貫設し、かつ、該螺合孔と同一軸心上に上記ジョイントの筒壁部に貫通孔を形成し、ネジ杆体を該貫通孔と上記横切欠部と上記螺合孔に串挿状として螺着して、固着されるものである。   Moreover, the connection structure of the steel pipe for reinforcing natural ground according to the present invention is a connection structure for connecting the ends of two circular tubular steel pipes for reinforcing natural ground with each other by a short cylindrical joint, At the end of the steel pipe, a plurality of elongated slits are formed in the longitudinal direction from the outermost edge, and a lateral notch is formed in the circumferential direction from the side edge of the elongated slit. There is an inner flange in the middle in the axial direction, and a circumferential concave groove into which the end of the steel pipe is inserted is formed in the inner flange, and the end of the steel pipe is inserted into the circumferential concave groove A plurality of supporting protrusions facing the inner peripheral surface of the end portion of the steel pipe in a state of being laid are provided upright from the inner flange, and a connecting wall portion inserted into the elongated slit is connected to the inner peripheral surface of the joint. It is formed so that the outer peripheral surfaces of a plurality of the above-mentioned supporting protrusions are connected, and a screwing hole is penetrated. A through hole is formed in the cylindrical wall portion of the joint on the same axis as the screw hole, and a screw housing is screwed into the through hole, the lateral notch, and the screw hole as a skewer. , It is fixed.

また、本発明に係る地山補強用鋼管の連結構造は、2本の円管状の地山補強用鋼管の端部を、短筒状のジョイントにて、相互に連結する連結構造であって、上記鋼管の端部に、ラジアル孔を複数形成し、さらに、上記ジョイントが、軸心方向中間部に内フランジを有し、該内フランジには上記鋼管の端部が差込まれる周状凹溝が形成され、かつ、上記鋼管の端部が上記周状凹溝に差込まれた状態で上記鋼管の端部の内周面に対向する複数の支持突片を上記内フランジから起立状として設け、複数の該支持突片に螺合孔を貫設し、かつ、該螺合孔と同一軸心上に上記ジョイントの筒壁部に貫通孔を形成し、ネジ杆体を該貫通孔と上記ラジアル孔と上記螺合孔に串挿状として螺着して、固着されるものである。   Moreover, the connection structure of the steel pipe for reinforcing natural ground according to the present invention is a connection structure for connecting the ends of two circular tubular steel pipes for reinforcing natural ground with each other by a short cylindrical joint, A plurality of radial holes are formed at the end of the steel pipe, and the joint has an inner flange at an axially central portion, and the circumferential concave groove into which the end of the steel pipe is inserted. And a plurality of supporting protrusions facing the inner peripheral surface of the end portion of the steel pipe with the end portion of the steel pipe inserted into the circumferential concave groove are provided upright from the inner flange. A plurality of support projecting pieces are threaded through, and a through hole is formed in the cylindrical wall portion of the joint on the same axial center as the screwed hole, and a screw housing is formed between the through hole and the radial. The hole and the screw hole are screwed in a skewered shape and fixed.

本発明によれば、一対の地山補強用鋼管をジョイントを介して容易に連結することができ、従来のように、鋼管同士を溶接する必要がなくなる。このことにより、鋼管の連結作業を簡素化して作業時間を大幅に短縮することができる。また、溶接に必要な電力や設備を用意する必要はなく、さらに、火災の虞れもないので、特に、トンネル内の施工に好適である。また、鋼管の肉厚を薄くすることもできる。そして、一対の鋼管をジョイントとネジ杆体で機械的構造により連結するので、連結強度を均一にすることができ、取り外しも可能である。さらに、ネジ杆体は両持梁状に支持されているので、強度上有利であり、破損しにくくなる。   According to the present invention, a pair of ground reinforcement steel pipes can be easily connected via a joint, and there is no need to weld the steel pipes as in the prior art. This simplifies the connection work of the steel pipes and can greatly shorten the work time. In addition, it is not necessary to prepare electric power and equipment necessary for welding, and there is no risk of fire, so it is particularly suitable for construction in a tunnel. Moreover, the thickness of the steel pipe can be reduced. And since a pair of steel pipes are connected by a mechanical structure with a joint and a screw housing, the connection strength can be made uniform and can be removed. Furthermore, since the screw housing is supported in the form of a doubly supported beam, it is advantageous in terms of strength and is difficult to break.

図1に於て、トンネル6の掘削時に切羽から切羽前方までの地山7を改良するため注入材を矢印Z方向に注入している状態を示す。削孔機8によって、掘削孔9を地山7に向かって斜め上方向に掘削すると共に、掘削孔9内に地山補強用鋼管(注入用有孔管)1を挿入する。しかも、3はジョイントを示し、定尺の鋼管1,1を、このジョイント3によって、順次連結(継ぎ足し)して、長さを延長して、地山7へ打込む。
また、地山補強用鋼管(注入用有孔管)1内に注入用パッカー26を設置し、このパッカー26と掘削孔9の孔底28との間に注入材を注入して、地山7を改良している。(いわゆる注入材の浸透注入工法の一例を示している。)
FIG. 1 shows a state in which an injection material is injected in the direction of arrow Z in order to improve the natural ground 7 from the face to the front of the face when the tunnel 6 is excavated. The excavation hole 9 is excavated obliquely upward toward the natural ground 7 by the drilling machine 8, and the natural steel reinforcing steel pipe (perforated pipe for injection) 1 is inserted into the excavation hole 9. In addition, reference numeral 3 denotes a joint. The steel pipes 1 and 1 of a fixed length are sequentially connected (added) by the joint 3 to extend the length and are driven into the natural ground 7.
Further, an injection packer 26 is installed in a natural steel reinforcing steel pipe (perforated pipe for injection) 1, and an injection material is injected between the packer 26 and the hole bottom 28 of the excavation hole 9. Has been improved. (An example of a so-called infusion method for an injection material is shown.)

図14に於て、この工法に好適な地山補強用鋼管(注入用有孔管)1の一例を示す。この鋼管1は、一端から長手方向に所定範囲にわたり孔29が貫設され、この所定範囲を越すと他端にまで逆止弁付き孔34が配設される。この逆止弁付き孔34は、地山補強用鋼管1の内部から所定圧力以上の圧力が作用すると開放し、かつ、地山側からの圧力(外圧)に対しては、閉鎖するように弁体が付設されている。
なお、本発明は、(図1に示したような)トンネル掘削時の切羽から切羽前方までの地山を改良する工法に限られず、他山を改良する工事一般にも広く適用可能である(図示省略)。さらに、図1のように斜め上方向に限らず、水平方向や垂直(上下)方向として地山へ打込むことも自由である(図示省略)。
FIG. 14 shows an example of a natural steel reinforcing steel pipe (a perforated pipe for injection) 1 suitable for this construction method. The steel pipe 1 has a hole 29 penetrating from one end in a longitudinal direction over a predetermined range, and a hole 34 with a check valve is disposed at the other end beyond the predetermined range. The check valve hole 34 is opened when a pressure higher than a predetermined pressure is applied from the inside of the steel pipe 1 for reinforcing the natural ground, and is closed so as to close against the pressure (external pressure) from the natural ground side. Is attached.
The present invention is not limited to the construction method for improving the natural ground from the face to the front of the face during tunnel excavation (as shown in FIG. 1), and can be widely applied to general construction for improving other mountains (shown in the figure). (Omitted). Further, it is not limited to the obliquely upward direction as shown in FIG.

そして、図2(a)の展開図と図3及び図7に於て、本発明の第1の実施の形態を示す。本発明の連結構造は、2本の円管状地山補強用鋼管1の端部2を、短筒状のジョイント3にて、相互に連結する構造であって、例えば、鋼管1の端部2は最端縁部60から長手方向へ細長状スリット61を円周方向に180°間隔で2箇所設けると共に、一つの細長状スリット61から円周方向に90°と270°の位置にラジアル孔63を設けている。   2A and FIG. 3 and FIG. 7 show the first embodiment of the present invention. The connection structure of the present invention is a structure in which the ends 2 of two circular tubular ground reinforcement steel pipes 1 are connected to each other by a short cylindrical joint 3, for example, the end 2 of the steel pipe 1. Two elongated slits 61 are provided in the longitudinal direction from the outermost edge 60 at intervals of 180 ° in the circumferential direction, and the radial holes 63 are provided at 90 ° and 270 ° positions in the circumferential direction from one elongated slit 61. Is provided.

次に、ジョイント3は、短筒状で軸心方向の中間部に内フランジ10を有し、地山補強用鋼管1の端部2が差込み可能な周状凹溝13が形成されている。また、地山補強用鋼管1がジョイント3に差し込まれた状態で鋼管1の端部2の内周面2aに対面状に内フランジ10から起立状として円周方向に90°間隔で支持突片70を4つ設けている。また、周状凹溝13の底面13aに鋼管1の端部2の最端縁部60が当たるように差込まれた状態で2つの支持突片70の外周面70aとジョイント3の内周面11を連結するように細長状スリット61を差込可能な連結壁部74を設けると共に、残り2つ支持突片には鋼管1の端部2のラジアル孔63と同一軸心上の螺合孔51を設けている。また、ジョイント3の筒壁部12には、螺合孔51と同一軸心上に貫通孔50を設けている。   Next, the joint 3 has a short cylindrical shape and has an inner flange 10 at an intermediate portion in the axial direction, and a circumferential concave groove 13 into which the end portion 2 of the natural mountain reinforcing steel pipe 1 can be inserted is formed. Further, in the state where the steel pipe 1 for natural ground reinforcement is inserted into the joint 3, it is raised from the inner flange 10 so as to face the inner peripheral surface 2 a of the end 2 of the steel pipe 1 and is supported at 90 ° intervals in the circumferential direction. There are four 70s. In addition, the outer peripheral surface 70a of the two support protrusions 70 and the inner peripheral surface of the joint 3 are inserted so that the bottom end surface 60a of the end portion 2 of the steel pipe 1 contacts the bottom surface 13a of the circumferential groove 13. 11 is provided with a connecting wall portion 74 into which the elongated slit 61 can be inserted, and the remaining two support protrusions are screw holes on the same axis as the radial hole 63 of the end portion 2 of the steel pipe 1. 51 are provided. Further, a through hole 50 is provided on the same axis as the screw hole 51 in the cylindrical wall portion 12 of the joint 3.

即ち、鋼管1の端部2の2箇所の細長状スリット61を2箇所の連結壁部74に各々に差し込みつつ、鋼管1の端部2の最端縁部60をジョイント3の周状凹溝13の底面13aに当たるまで差し込み、次に、ネジ杆体90を用いてジョイント3の筒壁部12の貫通孔50と鋼管1の端部2のラジアル孔63と支持突片70の螺合孔51を串挿状として螺着して鋼管1とジョイント3を固着することが可能な構造となっている。   That is, while inserting the two elongated slits 61 of the end portion 2 of the steel pipe 1 into the two connecting wall portions 74 respectively, the outermost edge 60 of the end portion 2 of the steel pipe 1 is connected to the circumferential concave groove of the joint 3. 13 until it hits the bottom surface 13a of the joint 13, and then, using the screw housing 90, the through hole 50 of the cylindrical wall portion 12 of the joint 3, the radial hole 63 of the end portion 2 of the steel pipe 1, and the screwing hole 51 of the support protrusion 70 are formed. The steel pipe 1 and the joint 3 can be fixed by screwing as a skewer.

次に、図2(b)の展開図と図4及び図8に於て、本発明の第2の実施の形態を示す。本発明の連結構造は、同様に地山補強用鋼管1をジョイント3にて相互に連結する構造であって、例えば、鋼管1の端部2は最端縁部60から長手方向へ細長状スリット61を設けると共に、円周方向に180°反対側の端部2にラジアル孔63を設けている。   Next, a developed view of FIG. 2B and FIGS. 4 and 8 show a second embodiment of the present invention. Similarly, the connection structure of the present invention is a structure in which the natural steel reinforcing steel pipes 1 are connected to each other by the joint 3. For example, the end 2 of the steel pipe 1 is elongated from the outermost edge 60 in the longitudinal direction. 61 is provided, and a radial hole 63 is provided at the end 2 opposite to the circumferential direction by 180 °.

次に、ジョイント3は、第1の実施の形態と同様に内フランジ10を有し、周状凹溝13が形成されている。また、ジョイント3に差し込まれた状態で地山補強用鋼管1の端部2の内周面2aに対面状に内フランジ10から起立状として180°対称位置に一対の支持突片70を設けている。また、周状凹溝13の底面13aに鋼管1の端部2の最端縁部60が当たるように差込まれた状態で一つの支持突片70の外周面70aとジョイント3の内周面11を連結するように細長状スリット61を差込可能な連結壁部74を設けると共に、残り一つ支持突片70には、鋼管1の端部2のラジアル孔63と同一軸心上の螺合孔51を設けている。また、ジョイント3の筒壁部12には、螺合孔51と同一軸心上に貫通孔50を設けている。   Next, the joint 3 has an inner flange 10 as in the first embodiment, and a circumferential groove 13 is formed. In addition, a pair of support protrusions 70 are provided at 180 ° symmetrical positions on the inner peripheral surface 2a of the end portion 2 of the natural steel reinforcing steel pipe 1 in a state of being inserted into the joint 3 so as to face up from the inner flange 10. Yes. Further, the outer peripheral surface 70a of one support protrusion 70 and the inner peripheral surface of the joint 3 in a state in which the bottom end 13a of the end portion 2 of the steel pipe 1 is brought into contact with the bottom surface 13a of the circumferential groove 13. 11 is provided with a connecting wall portion 74 into which the elongated slit 61 can be inserted, and the remaining one supporting protrusion 70 is screwed on the same axial center as the radial hole 63 of the end portion 2 of the steel pipe 1. A joint hole 51 is provided. Further, a through hole 50 is provided on the same axis as the screw hole 51 in the cylindrical wall portion 12 of the joint 3.

即ち、鋼管1の端部2の細長状スリット61を連結壁部74に差し込みつつ、鋼管1の端部2の最端縁部60をジョイント3の周状凹溝13の底面13aに当たるまで差し込み、次に、ネジ杆体90を用いてジョイント3の筒壁部12の貫通孔50と鋼管1の端部2のラジアル孔63と支持突片70の螺合孔51を串挿状として螺着して鋼管1とジョイント3を固着することが可能な構造となっている。   That is, while inserting the elongated slit 61 of the end 2 of the steel pipe 1 into the connecting wall 74, the outermost edge 60 of the end 2 of the steel pipe 1 is inserted until it hits the bottom surface 13 a of the circumferential groove 13 of the joint 3, Next, using the screw housing 90, the through hole 50 of the cylindrical wall portion 12 of the joint 3, the radial hole 63 of the end portion 2 of the steel pipe 1, and the screwing hole 51 of the support projecting piece 70 are screwed into a skewer shape. The steel pipe 1 and the joint 3 can be fixed.

次に、図2(c)の展開図と図5及び図9に於て、本発明の第3の実施の形態を示す。本発明の連結構造は、同様に地山補強用鋼管1をジョイント3にて相互に連結する構造であって、例えば、鋼管1の端部2は、最端縁部60から長手方向へ細長状スリット61を設けると共に、細長状スリット61の側端縁61aから掘削回転方向Nとは逆方向の円周方向へ横切欠部62を設け、さらに、円周方向に180°反対側の端面にも端部2の最端縁部60から長手方向へ細長状スリット61を設けると共に、細長状スリット61の側端縁61aから掘削回転方向Nとは逆方向の円周方向へ横切欠部62を設けている。   Next, a developed view of FIG. 2C and FIGS. 5 and 9 show a third embodiment of the present invention. Similarly, the connecting structure of the present invention is a structure in which the natural steel reinforcing steel pipes 1 are connected to each other by a joint 3. For example, the end 2 of the steel pipe 1 is elongated from the endmost edge 60 in the longitudinal direction. A slit 61 is provided, a lateral notch 62 is provided in the circumferential direction opposite to the excavation rotation direction N from the side edge 61a of the elongated slit 61, and also on the end surface 180 ° opposite to the circumferential direction. An elongated slit 61 is provided in the longitudinal direction from the outermost edge 60 of the end portion 2, and a lateral notch 62 is provided in a circumferential direction opposite to the excavation rotation direction N from the side edge 61 a of the elongated slit 61. ing.

次に、ジョイント3は、第1の実施の形態と同様に内フランジ10を有し、周状凹溝13が形成されている。また、地山補強用鋼管1がジョイント3に差し込まれた状態で鋼管1の端部2の内周面2aに対面状に内フランジ10から起立状として180°対称位置に支持突片70を2つ設けている。また、周状凹溝13の底面13aに鋼管1の端部2の最端縁部60が当たるように差込まれた状態で2つの支持突片70の外周面70aとジョイント3の内周面11を連結するように細長状スリット61を差込可能な連結壁部74を設けると共に、2つの支持突片70はネジ杆体90が横切欠部62に貫通可能な螺合孔51を設けている。また、ジョイント3の筒壁部12には、螺合孔51と同一軸心上に貫通孔50を設けている。   Next, the joint 3 has an inner flange 10 as in the first embodiment, and a circumferential groove 13 is formed. In addition, with the natural steel reinforcing pipe 1 inserted into the joint 3, the support protrusion 70 is placed at a 180 ° symmetrical position by standing upright from the inner flange 10 facing the inner peripheral surface 2 a of the end 2 of the steel pipe 1. Provided. In addition, the outer peripheral surface 70a of the two support protrusions 70 and the inner peripheral surface of the joint 3 are inserted so that the bottom end surface 60a of the end portion 2 of the steel pipe 1 contacts the bottom surface 13a of the circumferential groove 13. 11 is provided with a connecting wall portion 74 into which the elongated slit 61 can be inserted, and the two support protrusions 70 are provided with screwing holes 51 through which the screw housing 90 can pass through the horizontal notch 62. . Further, a through hole 50 is provided on the same axis as the screw hole 51 in the cylindrical wall portion 12 of the joint 3.

即ち、鋼管1の端部2の細長状スリット61を各々連結壁部74に差込みつつ、鋼管1の端部2の最端縁部60をジョイント3の周状凹溝13の底面13aに当たるまで差し込み、次に、ネジ杆体90を用いてジョイント3の筒壁部12の貫通孔50と鋼管1の端部2の横切欠部62と支持突片70の螺合孔51を串挿状として螺着して鋼管1とジョイント3を固着することが可能な構造となっている。   That is, while inserting the elongated slits 61 of the end portion 2 of the steel pipe 1 into the connecting wall portions 74, the outermost edge 60 of the end portion 2 of the steel pipe 1 is inserted until it contacts the bottom surface 13a of the circumferential groove 13 of the joint 3. Next, using the screw housing 90, the through hole 50 of the cylindrical wall portion 12 of the joint 3, the horizontal notch 62 of the end portion 2 of the steel pipe 1, and the screwing hole 51 of the support protrusion 70 are screwed in a skewered shape. Thus, the steel pipe 1 and the joint 3 can be fixed.

また、図2(d)の展開図と図6及び図10に於て、本発明の第4の実施の形態を示す。本発明の連結構造は、同様に地山補強用鋼管1をジョイント3にて相互に連結する構造であって、例えば、鋼管1の端部2はラジアル孔63を円周方向に90°間隔で4箇所設けている。   FIG. 2D and FIG. 6 and FIG. 10 show a fourth embodiment of the present invention. Similarly, the connecting structure of the present invention is a structure in which the natural steel reinforcing steel pipes 1 are connected to each other by a joint 3. For example, the end 2 of the steel pipe 1 has radial holes 63 at 90 ° intervals in the circumferential direction. Four locations are provided.

次に、ジョイント3は、第1の実施の形態と同様に内フランジ10を有し、周状凹溝13が形成されている。また、地山補強用鋼管1がジョイント3に差し込まれた状態で鋼管1の端部2の内周面2aに対面状に内フランジ10から起立状として円周方向に90°間隔で支持突片70を4つ設けている。また、周状凹溝13の底面13aに鋼管1の端部2の最端縁部60が当たるように差込まれた状態で、4つの支持突片には鋼管1の端部2のラジアル孔63と同一軸心上の螺合孔51を設けている。また、ジョイント3の筒壁部12には、螺合孔51と同一軸心上に貫通孔50を設けている。   Next, the joint 3 has an inner flange 10 as in the first embodiment, and a circumferential groove 13 is formed. Further, in the state where the steel pipe 1 for natural ground reinforcement is inserted into the joint 3, it is raised from the inner flange 10 so as to face the inner peripheral surface 2 a of the end 2 of the steel pipe 1 and is supported at 90 ° intervals in the circumferential direction. There are four 70s. Further, the radial holes of the end portion 2 of the steel pipe 1 are inserted into the four support projecting pieces in a state where the bottom end 13a of the end portion 2 of the steel pipe 1 is brought into contact with the bottom surface 13a of the circumferential groove 13. A screw hole 51 on the same axis as that of 63 is provided. Further, a through hole 50 is provided on the same axis as the screw hole 51 in the cylindrical wall portion 12 of the joint 3.

即ち、鋼管1の端部2の最端縁部60をジョイント3の周状凹溝13の底面13aに当たるまで差し込み、次に、ネジ杆体90を用いてジョイント3の筒壁部12の貫通孔50と鋼管1の端部2のラジアル孔63と支持突片70の螺合孔51を串挿状として螺着して鋼管1とジョイント3を固着することが可能な構造となっている。   That is, the outermost edge portion 60 of the end portion 2 of the steel pipe 1 is inserted until it contacts the bottom surface 13a of the circumferential groove 13 of the joint 3, and then the through hole 50 of the cylindrical wall portion 12 of the joint 3 using the screw housing 90. And the radial hole 63 of the end part 2 of the steel pipe 1 and the screwing hole 51 of the support protrusion 70 are screwed in a skewered shape so that the steel pipe 1 and the joint 3 can be fixed.

また、上述した地山補強用鋼管の連結構造の第1 ,2,4の実施の形態では、図11(a)のように回転トルクTを与えて地山補強用鋼管1がN方向へ回転されると、図11(b)のように鋼管1の端部2のラジアル孔63の内面63aが支持突片70の螺合孔51に螺着されたネジ杆体90に強く押し付けられて、図11(c)のように、鋼管1のラジアル孔63の(受圧側)内端縁63aが圧潰し、かつ、肉厚が増大する方向(内径方向及び外径方向)へ塑性変形して、極めて高い面圧で、筒壁部12の内周面11、及び、支持突片70の外周面70aに接触する(押圧される)。図11(c)の符号S,Tは極めて高い面圧にて接触している当接部を示し、この当接部S,Tに於ける極めて高い接触面圧によって摩擦抵抗が増大し、鋼管1と筒壁部12、及び、鋼管1と支持突片70との間で伝達される回転トルクTは極めて大となる。   Further, in the first, second, and fourth embodiments of the connection structure of the above-described ground reinforcement steel pipe, the ground reinforcement steel pipe 1 is rotated in the N direction by applying a rotational torque T as shown in FIG. Then, as shown in FIG. 11 (b), the inner surface 63a of the radial hole 63 at the end 2 of the steel pipe 1 is strongly pressed against the screw housing 90 screwed into the screwing hole 51 of the support projecting piece 70. 11 (c), the inner end edge 63a of the radial hole 63 of the steel pipe 1 is crushed and plastically deformed in the direction in which the wall thickness increases (inner diameter direction and outer diameter direction) With high surface pressure, the inner peripheral surface 11 of the cylindrical wall portion 12 and the outer peripheral surface 70a of the support protrusion 70 are contacted (pressed). Symbols S and T in FIG. 11 (c) indicate contact portions that are in contact with each other at an extremely high surface pressure. The friction resistance increases due to the extremely high contact surface pressure at these contact portions S and T, and the steel pipe 1 and the cylindrical wall part 12, and the rotational torque T transmitted between the steel pipe 1 and the support protrusion 70 becomes very large.

また、上述した地山補強用鋼管の連結構造の第3の実施の形態に於ては、図12に示す如く、同図(a)から(b)及び(c)と順次、矢印N方向の回転トルクTによって、横切欠部62の内端縁(内面)62aが圧潰して(肉厚が増大する塑性変形を起こし)、当接部S,Tに於て極めて高い接触面圧で、筒壁部12の内周面11、及び、支持突片70の外周面70aに接触・押圧され摩擦抵抗が増大して、大きな回転トルクが伝達される。なお、連結壁部74にスリット61の側端縁61aを強く当接させて、この連結壁部74にて、力を受けるのも望ましい場合(ネジ杆体90が細径のとき等)がある。   Further, in the third embodiment of the above-described connection structure of the steel pipe for reinforcing natural ground, as shown in FIG. 12, in the order of the arrow N in the order of (a) to (b) and (c). Due to the rotational torque T, the inner end edge (inner surface) 62a of the lateral notch 62 is crushed (causing plastic deformation with increasing wall thickness), and the cylinders are brought into contact with the contact portions S and T with extremely high contact surface pressure. The inner peripheral surface 11 of the wall portion 12 and the outer peripheral surface 70a of the support protrusion 70 are contacted and pressed to increase the frictional resistance, and a large rotational torque is transmitted. In some cases, it is desirable to cause the side wall edge 61a of the slit 61 to abut against the connecting wall portion 74 and receive a force at the connecting wall portion 74 (when the screw housing 90 has a small diameter, etc.).

また、上述した地山補強用鋼管の連結構造の実施の形態では、ネジ杆体90にて鋼管1とジョイント3は固着されているので、ネジ杆体90の取り外しによって、鋼管1とジョイント3はそれぞれ取り外しも容易となっている。また、内フランジ10に凹溝を設け鋼管1の端部2を差込状として固着することで、回転する際の鋼管1の内径方向への変形を規制し、回転トルクTの力が鋼管1の変形方向へ分散されず、円周方向へ効率良く力を伝達できる。   Further, in the embodiment of the connection structure of the steel pipe for reinforcing natural ground described above, since the steel pipe 1 and the joint 3 are fixed by the screw housing 90, the steel pipe 1 and the joint 3 are removed by removing the screw housing 90, respectively. It has also become easier. Further, by providing a concave groove in the inner flange 10 and fixing the end 2 of the steel pipe 1 as an insertion shape, deformation of the steel pipe 1 in the inner diameter direction during rotation is restricted, and the force of the rotational torque T is controlled by the steel pipe 1. The force can be efficiently transmitted in the circumferential direction without being dispersed in the deformation direction.

なお、本発明は上述の図示の実施の形態以外にも種々に設計変更自由であり、例えば、図13(a)のように、ネジ杆体90の頭部90aを筒壁部12の外周面12bに突出して螺着しても、図13(b)のように、貫通孔50をネジ頭部90aより大きく設定し、ネジ頭部90aを筒壁部12に埋没するように螺着しても良い。なお、図2(b)のように構成すれば、ネジ杆体90が(回転中に)摩耗や破損しにくいという利点がある。また、細長状スリット61やラジアル孔63及び支持突片70の数の増減は自由である。また、地山補強用鋼管1としては、注入用有孔管以外に、他の工法に用いられる鋼管、あるいは、孔無しの鋼管とすることも可能である。
ところで、地山補強用鋼管1の端部に、図2(a)〜(d)に示したようなスリット61,横切欠部62あるいはラジアル孔63を加工するには、未加工パイプ材(有孔管1)の端部の内部に受け金具を挿入し、油圧等のアクチュエータで直線作動する雄金型又はポンチにて、外周側から軸心直交方向に、押圧して、プレス加工やポンチ加工等の塑性加工にて形成するのが望ましい。
The present invention can be freely modified in various ways other than the embodiment shown in the drawings. For example, as shown in FIG. 13A, the head 90a of the screw housing 90 is connected to the outer peripheral surface 12b of the cylindrical wall portion 12. Even if it protrudes and is screwed, as shown in FIG. 13B, the through hole 50 is set larger than the screw head 90a, and the screw head 90a is screwed so as to be buried in the cylindrical wall portion 12. good. 2B is advantageous in that the screw housing 90 is not easily worn or damaged (during rotation). Further, the number of the elongated slits 61, the radial holes 63, and the support protrusions 70 can be freely increased or decreased. In addition to the perforated pipe for injection, the natural steel reinforcing steel pipe 1 can be a steel pipe used for other construction methods or a steel pipe without holes.
By the way, in order to process the slit 61, the lateral notch 62 or the radial hole 63 as shown in FIGS. 2 (a) to 2 (d) at the end of the steel pipe 1 for reinforcing natural ground, Insert a metal fitting inside the end of the hole tube 1), press it in the direction perpendicular to the axis from the outer periphery with a male die or punch that is operated linearly by an actuator such as hydraulic pressure, and press or punch It is desirable to form by plastic working such as.

以上のように、本発明は、2本の円管状の地山補強用鋼管1の端部2を、短筒状のジョイント3にて、相互に連結する連結構造であって、鋼管1の端部2に、最端縁部60から長手方向へ細長状スリット61を複数形成すると共に、ラジアル孔63を複数形成し、さらにジョイント3が、軸心方向中間部に内フランジ10を有し、内フランジ10には鋼管1の端部2が差込まれる周状凹溝13が形成され、かつ、鋼管1の端部2が周状凹溝13に差込まれた状態で鋼管1の端部2の内周面2aに対向する複数の支持突片70を内フランジ10から起立状として設け、細長状スリット61に差し込まれる連結壁部74をジョイント3の内周面11と支持突片70の内の所定数のものの外周面70aを連結するように形成し、さらに、残りの支持突片70に螺合孔51を貫設し、かつ、螺合孔51と同一軸心上にジョイント3の筒壁部12に貫通孔50を形成し、ネジ杆体90を貫通孔50とラジアル孔63と螺合孔51に串挿状として螺着して、固着することを特徴とする地山補強用鋼管の連結構造なので、一対の鋼管1をジョイント3を介して容易に連結することができ、従来のように、鋼管同士を溶接する必要がなくなる。このことにより、鋼管1の連結作業を簡素化して作業時間を大幅に短縮することもできる。また、溶接に必要な電力や設備を用意する必要はなく、さらに、火災の虞れもない。また、鋼管1を薄肉にできる。一対の鋼管1をジョイント3とネジ杆体90により機械的構造によって連結するので、連結強度を均一にすることができ、取り外しも可能である。また、細長状スリット61を連結壁部74へ差し込むことで、円周方向の位置決めの役目を果たし、ジョイント3の貫通孔50と鋼管1のラジアル孔63を略同一軸心上とできるためネジ杆体90の螺着が容易である。また、ジョイント3の複数の連結壁部74に各々細長状スリット61を差込むことで連結壁部74がガイドの役目を果たし、ジョイント3の軸心と鋼管1の軸心が略同一軸心上となるため大口径の鋼管1や重い鋼管1が斜めに拗れず、鋼管1をジョイント3へ容易に差し込める。また、ネジ杆体90を用いて複数の箇所で固着するため、深い掘削や、固い地盤の掘削など、回転トルクが必要な施工に対応できる。   As described above, the present invention is a connection structure in which the end portions 2 of two circular tubular ground reinforcement steel pipes 1 are connected to each other by the short cylindrical joint 3. In the portion 2, a plurality of elongated slits 61 are formed in the longitudinal direction from the outermost edge 60, and a plurality of radial holes 63 are formed. Further, the joint 3 has an inner flange 10 in the middle portion in the axial center direction, The flange 10 is formed with a circumferential groove 13 into which the end 2 of the steel pipe 1 is inserted, and the end 2 of the steel pipe 1 with the end 2 of the steel pipe 1 inserted into the circumferential groove 13. A plurality of support protrusions 70 facing the inner peripheral surface 2a of the inner flange 10 are provided upright from the inner flange 10, and a connecting wall portion 74 inserted into the elongated slit 61 is provided between the inner peripheral surface 11 of the joint 3 and the support protrusion 70. The predetermined number of outer peripheral surfaces 70a are connected to each other, and the screw holes 51 are formed through the remaining support protrusions 70. A through hole 50 is formed in the cylindrical wall portion 12 of the joint 3 on the same axis, and the screw housing 90 is screwed into the through hole 50, the radial hole 63, and the screw hole 51 as a skewered shape and fixed. Therefore, the pair of steel pipes 1 can be easily connected via the joint 3 and there is no need to weld the steel pipes as in the prior art. As a result, the connecting operation of the steel pipe 1 can be simplified and the working time can be greatly shortened. Moreover, it is not necessary to prepare electric power and equipment necessary for welding, and there is no risk of fire. Moreover, the steel pipe 1 can be made thin. Since the pair of steel pipes 1 are connected by a mechanical structure by the joint 3 and the screw housing 90, the connection strength can be made uniform and can be detached. In addition, by inserting the elongated slit 61 into the connecting wall portion 74, it plays the role of circumferential positioning, and the screw hole can be obtained because the through hole 50 of the joint 3 and the radial hole 63 of the steel pipe 1 can be on substantially the same axis. 90 screwing is easy. Further, by inserting the elongated slits 61 into the plurality of connecting wall portions 74 of the joint 3, the connecting wall portion 74 serves as a guide, and the axis of the joint 3 and the axis of the steel pipe 1 are on substantially the same axis. Therefore, the large-diameter steel pipe 1 and the heavy steel pipe 1 are not rolled obliquely, and the steel pipe 1 can be easily inserted into the joint 3. In addition, since it is fixed at a plurality of locations using the screw housing 90, it is possible to cope with construction that requires rotational torque, such as deep excavation and excavation of hard ground.

また、本発明は、2本の円管状の地山補強用鋼管1の端部2を、短筒状のジョイント3にて、相互に連結する連結構造であって、鋼管1の端部2に、最端縁部60から長手方向へ細長状スリット61を形成すると共に、細長状スリット61と180°反対側の端部2にラジアル孔63を形成し、さらに、ジョイント3が、軸心方向中間部に内フランジ10を有し、内フランジ10には鋼管1の端部2が差込まれる周状凹溝13が形成され、かつ、鋼管1の端部2が周状凹溝13に差込まれた状態で鋼管1の端部2の内周面2aに対向する一対の支持突片70を180°の対称位置に内フランジ10から起立状として設け、細長状スリット61に差込まれる連結壁部74がジョイント3の内周面11と一つの支持突片70の外周面70aを連結するように形成し、残りの支持突片70に螺合孔51を貫設し、かつ、螺合孔51を同一軸心上にジョイント3の筒壁部12に貫通孔50を形成し、ネジ杆体90を貫通孔50とラジアル孔63と螺合孔51に串挿状として螺着して、固着することを特徴とする地山補強用鋼管の連結構造なので、一対の鋼管1をジョイント3を介して容易に連結することができ、従来のように、鋼管同士を溶接する必要がなくなる。このことにより、鋼管1の連結作業を簡素化して作業時間を大幅に短縮することもできる。また、溶接に必要な電力や設備を用意する必要はなく、さらに、火災の虞れもない。また、一対の鋼管1をジョイント3とネジ杆体90により機械的構造によって連結するので、連結強度を均一にすることができ、取り外しも可能である。また、鋼管1を薄肉にできる。細長状スリット61を連結壁部74へ差し込むことで、円周方向の位置決めの役目を果たし、ジョイント3の貫通孔50と鋼管1のラジアル孔63を略同一軸心上とできるためネジ杆体90の螺着作業が容易である。また、ジョイント3の連結壁部74へ細長状スリット61を差し込む箇所を一箇所にすることで、ジョイント3の軸心と鋼管1の軸心が略同一軸心上に容易かつ迅速にできると共に、ネジ杆体90の螺着作業も一箇所のため連結作業の時間が短縮され作業効率が上がる。よって、大量の鋼管を埋設する施工や、時間の限られた緊急の施工に対応できる。また、支持突片70を2箇所しか必要としないため、ジョイント3が小型・軽量化でき、安価で製作できる。また、鋼管1の端部2の加工面積が少ない為、表面積の少ない細い鋼管1にも対応できる。   Further, the present invention is a connection structure in which the end portions 2 of two circular tubular ground reinforcement steel pipes 1 are connected to each other by a short cylindrical joint 3, and the end portions 2 of the steel pipe 1 are connected to each other. The elongated slit 61 is formed in the longitudinal direction from the outermost edge 60, and the radial hole 63 is formed in the end 2 opposite to the elongated slit 61 at 180 °. The inner flange 10 is formed with a circumferential groove 13 into which the end 2 of the steel pipe 1 is inserted, and the end 2 of the steel pipe 1 is inserted into the circumferential groove 13. A pair of supporting projections 70 facing the inner peripheral surface 2a of the end 2 of the steel pipe 1 in a state of being laid are provided upright from the inner flange 10 at symmetrical positions of 180 °, and connected to the elongated slit 61 The portion 74 is formed so as to connect the inner peripheral surface 11 of the joint 3 and the outer peripheral surface 70a of one support projecting piece 70. 1 and the through hole 50 is formed in the cylindrical wall portion 12 of the joint 3 on the same axis, and the screw housing 90 is formed in the through hole 50, the radial hole 63, and the screw hole 51. Since the connection structure of the steel pipe for reinforcing natural ground is characterized by being screwed and fixed as a skewered shape, the pair of steel pipes 1 can be easily connected via the joint 3, and as in the conventional case, the steel pipe There is no need to weld each other. As a result, the connecting operation of the steel pipe 1 can be simplified and the working time can be greatly shortened. Moreover, it is not necessary to prepare electric power and equipment necessary for welding, and there is no risk of fire. Further, since the pair of steel pipes 1 are connected by a mechanical structure by the joint 3 and the screw housing 90, the connection strength can be made uniform and can be removed. Moreover, the steel pipe 1 can be made thin. By inserting the elongated slit 61 into the connecting wall portion 74, it plays a role of circumferential positioning, and the through hole 50 of the joint 3 and the radial hole 63 of the steel pipe 1 can be on substantially the same axis, so that the screw housing 90 Screwing work is easy. Further, by making the elongated slit 61 into one place into the connecting wall portion 74 of the joint 3, the axis of the joint 3 and the axis of the steel pipe 1 can be easily and quickly on substantially the same axis, Since the screw housing 90 is screwed in one place, the time required for the connection work is shortened and the work efficiency is increased. Therefore, it can respond to construction for burying a large amount of steel pipes and emergency construction with limited time. Further, since only two support protrusions 70 are required, the joint 3 can be reduced in size and weight and can be manufactured at a low cost. Moreover, since the processing area of the edge part 2 of the steel pipe 1 is small, it can respond also to the thin steel pipe 1 with a small surface area.

また、本発明は、2本の円管状の地山補強用鋼管1の端部2を、短筒状のジョイント3にて、相互に連結する連結構造であって、鋼管1の端部2に、最端縁部60から長手方向へ細長状スリット61を複数形成すると共に、細長状スリット61の側端縁61aから円周方向へ横切欠部62を形成し、さらに、ジョイント3が、軸心方向中間部に内フランジ10を有し、内フランジ10には鋼管1の端部2が差込まれる周状凹溝13が形成され、かつ、鋼管1の端部2が周状凹溝13に差込まれた状態で鋼管1の端部2の内周面2aに対向する複数の支持突片70を内フランジ10から起立状として設け、細長状スリット61に差込まれる連結壁部74をジョイント3の内周面11と複数の支持突片70の外周面70aを連結するように形成すると共に、螺合孔51を貫設し、かつ、螺合孔51と同一軸心上にジョイント3の筒壁部12に貫通孔50を形成し、ネジ杆体90を貫通孔50と横切欠部62と螺合孔51に串挿状として螺着して、固着することを特徴とする地山補強用鋼管の連結構造なので、一対の鋼管1をジョイント3を介して容易に連結することができ、従来のように、鋼管同士を溶接する必要がなくなる。このことにより、鋼管1の連結作業を簡素化して作業時間を大幅に短縮することもできる。また、溶接に必要な電力や設備を用意する必要はなく、さらに、火災の虞れもない。また、鋼管1を薄肉にできる。一対の鋼管1をジョイント3とネジ杆体90により機械的構造によって連結するので、連結強度を均一にすることができ、取り外しも可能である。また細長状スリット61を連結壁部74へ差し込むことで、円周方向の位置決めの役目を果たし、ジョイント3の貫通孔50から差し込んだネジ杆体90が鋼管1の横切欠部62に貫通可能な位置に決定できるため、螺着作業が容易である。また、ジョイント3の複数の連結壁部74に各々細長状スリット61を差込むことで連結壁部74がガイドの役目を果たし、ジョイント3の軸心と鋼管1の軸心が略同一軸心上となるため、鋼管1をジョイント3へ容易に差し込める。また、細長状スリット61と横切欠部62を一形状とすることで、一工程で成形可能なため、効率的な鋼管1の端部2の加工ができる。   Further, the present invention is a connection structure in which the end portions 2 of two circular tubular ground reinforcement steel pipes 1 are connected to each other by a short cylindrical joint 3, and the end portions 2 of the steel pipe 1 are connected to each other. A plurality of elongated slits 61 are formed in the longitudinal direction from the outermost edge 60, and a lateral notch 62 is formed in the circumferential direction from the side edge 61a of the elongated slit 61. Further, the joint 3 has an axial center An inner flange 10 is provided in the middle of the direction, and a circumferential groove 13 into which the end 2 of the steel pipe 1 is inserted is formed in the inner flange 10, and the end 2 of the steel pipe 1 is formed into the circumferential groove 13. In the inserted state, a plurality of support protrusions 70 facing the inner peripheral surface 2a of the end 2 of the steel pipe 1 are provided upright from the inner flange 10, and the connecting wall 74 is inserted into the elongated slit 61. 3 and the outer peripheral surface 70a of the plurality of support projecting pieces 70 are connected to each other, and the screwing hole 51 is provided therethrough. A through-hole 50 is formed in the cylindrical wall portion 12 of the joint 3 on a single axis, and the screw housing 90 is screwed into the through-hole 50, the lateral notch 62, and the screw-in hole 51 as a skewer and fixed. Therefore, the pair of steel pipes 1 can be easily connected via the joint 3 and there is no need to weld the steel pipes as in the prior art. As a result, the connecting operation of the steel pipe 1 can be simplified and the working time can be greatly shortened. Moreover, it is not necessary to prepare electric power and equipment necessary for welding, and there is no risk of fire. Moreover, the steel pipe 1 can be made thin. Since the pair of steel pipes 1 are connected by a mechanical structure by the joint 3 and the screw housing 90, the connection strength can be made uniform and can be detached. In addition, by inserting the elongated slit 61 into the connecting wall portion 74, it plays a role of circumferential positioning, and the position where the screw housing 90 inserted from the through hole 50 of the joint 3 can penetrate the horizontal notch 62 of the steel pipe 1. Therefore, the screwing operation is easy. Further, by inserting the elongated slits 61 into the plurality of connecting wall portions 74 of the joint 3, the connecting wall portion 74 serves as a guide, and the axis of the joint 3 and the axis of the steel pipe 1 are on substantially the same axis. Therefore, the steel pipe 1 can be easily inserted into the joint 3. In addition, since the elongated slit 61 and the lateral notch 62 are formed in one shape, the end 2 of the steel pipe 1 can be processed efficiently because it can be formed in one step.

また、本発明は、2本の円管状の地山補強用鋼管1の端部2を、短筒状のジョイント3にて、相互に連結する連結構造であって、鋼管1の端部2に、ラジアル孔63を複数形成し、さらに、ジョイント3が、軸心方向中間部に内フランジ10を有し、内フランジ10には鋼管1の端部2が差込まれる周状凹溝13が形成され、かつ、鋼管1の端部2が周状凹溝13に差込まれた状態で鋼管1の端部2の内周面2aに対向する複数の支持突片70を内フランジ10から起立状として設け、複数の支持突片70に螺合孔51を貫設し、かつ、螺合孔51と同一軸心上にジョイント3の筒壁部12に貫通孔50を形成し、ネジ杆体90を貫通孔50とラジアル孔63と螺合孔51に串挿状として螺着して、固着することを特徴とする地山補強用鋼管の連結構造なので、一対の鋼管1をジョイント3を介して容易に連結することができ、従来のように、鋼管同士を溶接する必要がなくなる。このことにより、鋼管1の連結作業を簡素化して作業時間を大幅に短縮することもできる。また、溶接に必要な電力や設備を用意する必要はなく、さらに、火災の虞れもない。また、一対の鋼管1をジョイント3とネジ杆体90により機械的構造によって連結するので、連結強度を均一にすることができ、取り外しも可能である。   Further, the present invention is a connection structure in which the end portions 2 of two circular tubular ground reinforcement steel pipes 1 are connected to each other by a short cylindrical joint 3, and the end portions 2 of the steel pipe 1 are connected to each other. , A plurality of radial holes 63 are formed, and the joint 3 has an inner flange 10 in an intermediate portion in the axial center direction, and a circumferential groove 13 into which the end 2 of the steel pipe 1 is inserted is formed in the inner flange 10. In addition, a plurality of support protrusions 70 facing the inner peripheral surface 2a of the end 2 of the steel pipe 1 are raised from the inner flange 10 in a state where the end 2 of the steel pipe 1 is inserted into the circumferential groove 13. A screw hole 51 is formed in the plurality of support protrusions 70, and a through hole 50 is formed in the cylindrical wall portion 12 of the joint 3 on the same axis as the screw hole 51. Since it is a connecting structure of steel pipes for reinforcing natural ground characterized in that it is screwed into the through hole 50, the radial hole 63 and the screwing hole 51 in a skewered manner, it is fixed, so a pair of steel pipes 1 are joined together. It can be easily connected via, as in the conventional, there is no need to weld steel pipes. As a result, the connecting operation of the steel pipe 1 can be simplified and the working time can be greatly shortened. Moreover, it is not necessary to prepare electric power and equipment necessary for welding, and there is no risk of fire. Further, since the pair of steel pipes 1 are connected by a mechanical structure by the joint 3 and the screw housing 90, the connection strength can be made uniform and can be removed.

使用状況を示す実施の一形態の断面側面説明図である。It is sectional side explanatory drawing of one Embodiment which shows a use condition. 実施の形態を示す展開図である。It is an expanded view which shows embodiment. 第1の実施の形態を示す要部断面図である。It is principal part sectional drawing which shows 1st Embodiment. 第2の実施の形態を示す要部断面図である。It is principal part sectional drawing which shows 2nd Embodiment. 第3の実施の形態を示す要部断面図である。It is principal part sectional drawing which shows 3rd Embodiment. 第4の実施の形態を示す要部断面図である。It is principal part sectional drawing which shows 4th Embodiment. 使用状態説明図である。FIG. 使用状態説明図である。FIG. 使用状態説明図である。FIG. 使用状態説明図である。FIG. 作用説明図である。It is an operation explanatory view. 作用説明図である。It is an operation explanatory view. 要部拡大断面図である。It is a principal part expanded sectional view. 鋼管の一例の要部斜視図である。It is a principal part perspective view of an example of a steel pipe.

符号の説明Explanation of symbols

1 地山補強用鋼管(注入用有孔管)
2 端部
2a 内周面
3 ジョイント
10 内フランジ
11 内周面
12 筒壁部
13 周状凹溝
50 貫通孔
51 螺合孔
60 最端縁部
61 細長状スリット
61a 側端縁
62 横切欠部
63 ラジアル孔
70 支持突片
70a 外周面
74 連結壁部
90 ネジ杆体
1 Steel pipe for ground reinforcement (perforated pipe for injection)
2 End 2a Inner peripheral surface 3 Joint
10 Inner flange
11 Inner peripheral surface
12 Tube wall
13 Circumferential groove
50 Through hole
51 Screw hole
60 edge
61 Elongated slit
61a Side edge
62 Horizontal cutout
63 Radial hole
70 Supporting protrusion
70a outer peripheral surface
74 Connecting wall
90 Screw housing

Claims (4)

2本の円管状の地山補強用鋼管(1)の端部(2)を、短筒状のジョイント(3)にて、相互に連結する連結構造であって、
上記鋼管(1)の端部(2)に、最端縁部(60)から長手方向へ細長状スリット(61)を複数形成すると共に、ラジアル孔(63)を複数形成し、
さらに上記ジョイント(3)が、軸心方向中間部に内フランジ(10)を有し、該内フランジ(10)には上記鋼管(1)の端部(2)が差込まれる周状凹溝(13)が形成され、かつ、上記鋼管(1)の端部(2)が上記周状凹溝(13)に差込まれた状態で上記鋼管(1)の端部(2)の内周面(2a) に対向する複数の支持突片(70)を上記内フランジ(10)から起立状として設け、上記細長状スリット(61)に差し込まれる連結壁部(74)を上記ジョイント(3)の内周面(11)と上記支持突片(70)の内の所定数のものの外周面(70a)を連結するように形成し、さらに、残りの上記支持突片(70)に螺合孔(51)を貫設し、かつ、該螺合孔(51)と同一軸心上に上記ジョイント(3)の筒壁部(12)に貫通孔(50)を形成し、ネジ杆体(90)を該貫通孔(50)と上記ラジアル孔(63)と上記螺合孔(51)に串挿状として螺着して、固着することを特徴とする地山補強用鋼管の連結構造。
It is a connection structure for connecting the ends (2) of two circular tubular steel pipes for ground reinforcement (1) to each other by a short cylindrical joint (3),
In the end (2) of the steel pipe (1), a plurality of elongated slits (61) are formed in the longitudinal direction from the outermost edge (60), and a plurality of radial holes (63) are formed,
Furthermore, the joint (3) has an inner flange (10) at the axially intermediate portion, and the inner groove (10) is a circumferential groove into which the end (2) of the steel pipe (1) is inserted. (13) is formed, and the inner periphery of the end (2) of the steel pipe (1) in a state where the end (2) of the steel pipe (1) is inserted into the circumferential concave groove (13) A plurality of support protrusions (70) facing the surface (2a) are provided upright from the inner flange (10), and a connecting wall portion (74) inserted into the elongated slit (61) is provided as the joint (3). The inner peripheral surface (11) and a predetermined number of the outer peripheral surfaces (70a) of the support projecting pieces (70) are connected to each other, and the remaining support projecting pieces (70) are further threaded. A through hole (50) is formed in the cylindrical wall portion (12) of the joint (3) on the same axis as the screw hole (51). The penetration (50) and the radial hole (63) and then screwed as skewers 挿状 above screw hole (51), the coupling structure of the natural ground reinforcing steel, characterized in that the anchoring.
2本の円管状の地山補強用鋼管(1)の端部(2)を、短筒状のジョイント(3)にて、相互に連結する連結構造であって、
上記鋼管(1)の端部(2)に、最端縁部(60)から長手方向へ細長状スリット(61)を形成すると共に、該細長状スリット(61)と180°反対側の上記端部(2)にラジアル孔(63)を形成し、
さらに、上記ジョイント(3)が、軸心方向中間部に内フランジ(10)を有し、該内フランジ(10)には上記鋼管(1)の端部(2)が差込まれる周状凹溝(13)が形成され、かつ、上記鋼管(1)の端部(2)が上記周状凹溝(13)に差込まれた状態で上記鋼管(1)の端部(2)の内周面(2a) に対向する一対の支持突片(70)を180°の対称位置に上記内フランジ(10)から起立状として設け、上記細長状スリット(61)に差込まれる連結壁部(74)が上記ジョイント(3)の内周面(11)と一つの上記支持突片(70)の外周面(70a)を連結するように形成し、残りの上記支持突片(70)に螺合孔(51)を貫設し、かつ、該螺合孔(51)を同一軸心上に上記ジョイント(3)の筒壁部(12)に貫通孔(50)を形成し、ネジ杆体(90)を該貫通孔(50)と上記ラジアル孔(63)と上記螺合孔(51)に串挿状として螺着して、固着することを特徴とする地山補強用鋼管の連結構造。
It is a connection structure for connecting the ends (2) of two circular tubular steel pipes for ground reinforcement (1) to each other by a short cylindrical joint (3),
In the end (2) of the steel pipe (1), an elongated slit (61) is formed in the longitudinal direction from the outermost edge (60), and the end opposite to the elongated slit (61) by 180 ° Forming a radial hole (63) in the part (2),
Further, the joint (3) has an inner flange (10) at an axially intermediate portion, and a circumferential recess into which the end (2) of the steel pipe (1) is inserted into the inner flange (10). In the state where the groove (13) is formed and the end (2) of the steel pipe (1) is inserted into the circumferential concave groove (13), the end (2) of the steel pipe (1) A pair of supporting protrusions (70) facing the peripheral surface (2a) are provided upright from the inner flange (10) at a symmetrical position of 180 °, and a connecting wall portion ( 74) is formed so as to connect the inner peripheral surface (11) of the joint (3) and the outer peripheral surface (70a) of one support projecting piece (70), and is screwed onto the remaining support projecting piece (70). A through hole (50) is formed in the cylindrical wall portion (12) of the joint (3) on the same axis, and the through hole (51) is formed on the screw hole (51). 90) through (50) and the radial hole (63) and then screwed as skewers 挿状 above screw hole (51), the coupling structure of the natural ground reinforcing steel, characterized in that the anchoring.
2本の円管状の地山補強用鋼管(1)の端部(2)を、短筒状のジョイント(3)にて、相互に連結する連結構造であって、
上記鋼管(1)の端部(2)に、最端縁部(60)から長手方向へ細長状スリット(61)を複数形成すると共に、該細長状スリット(61)の側端縁(61a)から円周方向へ横切欠部(62)を形成し、
さらに、上記ジョイント(3)が、軸心方向中間部に内フランジ(10)を有し、該内フランジ(10)には上記鋼管(1)の端部(2)が差込まれる周状凹溝(13)が形成され、かつ、上記鋼管(1)の端部(2)が上記周状凹溝(13)に差込まれた状態で上記鋼管(1)の端部(2)の内周面(2a) に対向する複数の支持突片(70)を上記内フランジ(10)から起立状として設け、上記細長状スリット(61)に差込まれる連結壁部(74)を上記ジョイント(3)の内周面(11)と複数の上記支持突片(70)の外周面(70a)を連結するように形成すると共に、螺合孔(51)を貫設し、かつ、該螺合孔(51)と同一軸心上に上記ジョイント(3)の筒壁部(12)に貫通孔(50)を形成し、ネジ杆体(90)を該貫通孔(50)と上記横切欠部(62)と上記螺合孔(51)に串挿状として螺着して、固着することを特徴とする地山補強用鋼管の連結構造。
It is a connection structure for connecting the ends (2) of two circular tubular steel pipes for ground reinforcement (1) to each other by a short cylindrical joint (3),
A plurality of elongated slits (61) are formed in the end portion (2) of the steel pipe (1) in the longitudinal direction from the outermost edge portion (60), and side edges (61a) of the elongated slit (61) are formed. Form a transverse notch (62) in the circumferential direction from
Further, the joint (3) has an inner flange (10) at an axially intermediate portion, and a circumferential recess into which the end (2) of the steel pipe (1) is inserted into the inner flange (10). In the state where the groove (13) is formed and the end (2) of the steel pipe (1) is inserted into the circumferential concave groove (13), the end (2) of the steel pipe (1) A plurality of support protrusions (70) facing the peripheral surface (2a) are provided upright from the inner flange (10), and the connecting wall portion (74) inserted into the elongated slit (61) is connected to the joint ( 3) the inner peripheral surface (11) and the outer peripheral surfaces (70a) of the plurality of support projecting pieces (70) are connected to each other, and the screwing hole (51) is provided therethrough, and the screwing is performed. A through hole (50) is formed in the cylindrical wall (12) of the joint (3) on the same axis as the hole (51), and the screw housing (90) is connected to the through hole (50) and the lateral notch ( 62) and the above screwing (51) to be screwed as a skewer 挿状 connection structure of the natural ground reinforcing steel, characterized in that the anchoring.
2本の円管状の地山補強用鋼管(1)の端部(2)を、短筒状のジョイント(3)にて、相互に連結する連結構造であって、
上記鋼管(1)の端部(2)に、ラジアル孔(63)を複数形成し、
さらに、上記ジョイント(3)が、軸心方向中間部に内フランジ(10)を有し、該内フランジ(10)には上記鋼管(1)の端部(2)が差込まれる周状凹溝(13)が形成され、かつ、上記鋼管(1)の端部(2)が上記周状凹溝(13)に差込まれた状態で上記鋼管(1)の端部(2)の内周面(2a) に対向する複数の支持突片(70)を上記内フランジ(10)から起立状として設け、複数の該支持突片(70)に螺合孔(51)を貫設し、かつ、該螺合孔(51)と同一軸心上に上記ジョイント(3)の筒壁部(12)に貫通孔(50)を形成し、ネジ杆体(90)を該貫通孔(50)と上記ラジアル孔(63)と上記螺合孔(51)に串挿状として螺着して、固着することを特徴とする地山補強用鋼管の連結構造。
It is a connection structure for connecting the ends (2) of two circular tubular steel pipes for ground reinforcement (1) to each other by a short cylindrical joint (3),
A plurality of radial holes (63) are formed in the end (2) of the steel pipe (1),
Further, the joint (3) has an inner flange (10) at an axially intermediate portion, and a circumferential recess into which the end (2) of the steel pipe (1) is inserted into the inner flange (10). In the state where the groove (13) is formed and the end (2) of the steel pipe (1) is inserted into the circumferential concave groove (13), the end (2) of the steel pipe (1) A plurality of support protrusions (70) facing the peripheral surface (2a) are provided upright from the inner flange (10), and screwing holes (51) are provided through the plurality of support protrusions (70). Further, a through hole (50) is formed in the cylindrical wall portion (12) of the joint (3) on the same axis as the screw hole (51), and the screw housing (90) is connected to the through hole (50). A connection structure for a steel pipe for reinforcing natural ground, wherein the radial hole (63) and the screw hole (51) are screwed in a skewered shape and fixed.
JP2007274024A 2007-10-22 2007-10-22 Connection structure between natural ground reinforcing steel pipes Pending JP2009102845A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007274024A JP2009102845A (en) 2007-10-22 2007-10-22 Connection structure between natural ground reinforcing steel pipes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007274024A JP2009102845A (en) 2007-10-22 2007-10-22 Connection structure between natural ground reinforcing steel pipes

Publications (1)

Publication Number Publication Date
JP2009102845A true JP2009102845A (en) 2009-05-14

Family

ID=40704802

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007274024A Pending JP2009102845A (en) 2007-10-22 2007-10-22 Connection structure between natural ground reinforcing steel pipes

Country Status (1)

Country Link
JP (1) JP2009102845A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014221988A (en) * 2013-05-14 2014-11-27 東亜建設工業株式会社 Ground improvement method and outer pipe for chemical injection

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07292662A (en) * 1994-04-28 1995-11-07 Kubota Corp Connection structure of steel pipe pile
JPH0827781A (en) * 1994-07-14 1996-01-30 Shimizu Corp Coupling structure of steel pipe pile and construction of steel pipe pile using coupling structure of steel pipe pile
JP2002285541A (en) * 2001-03-27 2002-10-03 Tokai Rubber Ind Ltd Packer
JP2005097910A (en) * 2003-09-24 2005-04-14 Daiwa House Ind Co Ltd Steel pipe joint structure
JP2006097272A (en) * 2004-09-28 2006-04-13 Ohbayashi Corp Method of removing redundant portion of pipe bodies in natural ground reinforcing works
JP2006152796A (en) * 2004-11-08 2006-06-15 Jfe Steel Kk Connection method of steel pipe
JP2008223409A (en) * 2007-03-15 2008-09-25 Nippon Steel Corp Connection structure of pile, and connection structure of pile and blade
JP2008308856A (en) * 2007-06-13 2008-12-25 Shintoku Kogyo Kk Steel pipe pile for under-pinning

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07292662A (en) * 1994-04-28 1995-11-07 Kubota Corp Connection structure of steel pipe pile
JPH0827781A (en) * 1994-07-14 1996-01-30 Shimizu Corp Coupling structure of steel pipe pile and construction of steel pipe pile using coupling structure of steel pipe pile
JP2002285541A (en) * 2001-03-27 2002-10-03 Tokai Rubber Ind Ltd Packer
JP2005097910A (en) * 2003-09-24 2005-04-14 Daiwa House Ind Co Ltd Steel pipe joint structure
JP2006097272A (en) * 2004-09-28 2006-04-13 Ohbayashi Corp Method of removing redundant portion of pipe bodies in natural ground reinforcing works
JP2006152796A (en) * 2004-11-08 2006-06-15 Jfe Steel Kk Connection method of steel pipe
JP2008223409A (en) * 2007-03-15 2008-09-25 Nippon Steel Corp Connection structure of pile, and connection structure of pile and blade
JP2008308856A (en) * 2007-06-13 2008-12-25 Shintoku Kogyo Kk Steel pipe pile for under-pinning

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014221988A (en) * 2013-05-14 2014-11-27 東亜建設工業株式会社 Ground improvement method and outer pipe for chemical injection

Similar Documents

Publication Publication Date Title
US20060243453A1 (en) Tubing connector
JP4713526B2 (en) Pile connection structure and pile-blade connection structure
JP2006226102A (en) Connecting joint of steel pipe
JP2009102845A (en) Connection structure between natural ground reinforcing steel pipes
JP2010190038A (en) Method for joining prefabricated pile and joint metal for the prefabricated pile
JP2018197436A (en) Steel pipe joint device
JP2015071870A (en) Press-fitting pipe joint method and press-fitting pipe caulking device for use in the same
JP4659542B2 (en) Branch pipe connection device
JP2009293343A (en) Connection structure of natural ground reinforcement pipe
JP2005207081A (en) Joint structure of steel pipe pile
US7918626B2 (en) Systems and methods for pipe replacement
JP2000001850A (en) Underground anchor
JP6161370B2 (en) Backing prevention device
JP4986674B2 (en) Pile connector and pile using the connector
JP2015148135A (en) Spiral pile base and construction method thereof
JP2005076415A (en) Steel pipe pile, and method of connecting the steel pipe piles
JP6470699B2 (en) Pile connection structure
JP4773745B2 (en) Seismic joint device for manhole
JP6482064B2 (en) Connecting tool for pile and single pipe
JP2006188889A (en) Joint structure of pile
JP7089819B1 (en) Casing tube stopper, casing tube, and casing tube extraction method
JP2019007171A (en) Method for manufacturing hole expansion bit of rhombic pantagraph specifications and hole expansion bit of rhombic pantagraph specifications capable of adjusting hole diameter
JP2005171532A (en) Joint for connecting steel pipe pile
JP2009078337A (en) Tubular body boring device and tubular body boring method
JP2549401Y2 (en) Piping connection device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20100118

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110726

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20110727

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20111206