WO2016132650A1

WO2016132650A1 - Joint mechanism and connection method for steel pipe

Info

Publication number: WO2016132650A1
Application number: PCT/JP2015/085892
Authority: WO
Inventors: 鈴木友之; 菊池俊介; 外山征; 永島健; 山本浩之
Original assignee: 株式会社クボタ
Priority date: 2015-02-20
Filing date: 2015-12-22
Publication date: 2016-08-25
Also published as: US20170183837A1; JP2016153579A; JP6456181B2; KR20170120486A; SG11201608074SA

Abstract

The present invention achieves simplification and a reduction in the cost of a structure for connecting a pair of steel pipes. This joint mechanism for a pair of steel pipe piles 1A, 1B is provided with: an inner joint 10A provided in steel pipe pile 1A; an inner joint 10B; an outer joint 20 that is provided around the inner joint 10A of steel pipe pile 1A and the inner joint 10B of steel pipe pile 1B, spanning said joints; and a key member 30 for preventing the pair of steel pipe piles 1A, 1B from moving relative to each other in a steel pipe pile 1 length direction. The outer joint 20 is provided with an opening 22 (22A, 22B) for inserting, from the outer peripheral surface of the outer joint 20, a divided key member 31, which constitutes a key member 30, into a key groove which is composed of outward-facing peripheral grooves 13 (13A, 13B), which are provided in the outer peripheries of inner joint 10A and inner joint 10B, and inward-facing peripheral grooves 23 (23A, 23B), which are provided in the inner periphery of the outer joint 20 and face the outward-facing peripheral grooves 13 (13A, 13B).

Description

鋼管の継手機構及び連結方法Steel pipe joint mechanism and connection method

　本発明は、鋼管の継手機構及び連結方法に関する。 The present invention relates to a steel pipe joint mechanism and a connection method.

　構造物設置用の基礎杭や土留め用矢板、地滑り抑止杭、橋脚用柱などを構成するために鋼管の一例として鋼管杭が使用される。軟弱な地盤の下にある硬い地盤である支持層内に到達させるためには長い鋼管杭が必要となるが、製作や運搬等の都合から、工場製作された数メートルから数十メートル程度の鋼管杭を現場に搬入し、現場において複数の鋼管杭を上下に連結しながら所定の長さのものを形成することが行われている。 Steel pipe piles are used as an example of steel pipes to form foundation piles for structure installation, earth retaining sheet piles, landslide deterrent piles, and pier columns. Long steel pipe piles are required to reach the support layer, which is the hard ground under the soft ground. A pile is carried into the site, and a plurality of steel pipe piles are connected to each other at the site to form a predetermined length.

　上記のような、鋼管杭を連結するための機構として、特許文献１には、機械式の継手機構が提案されている。 As a mechanism for connecting steel pipe piles as described above, a mechanical joint mechanism is proposed in Patent Document 1.

　この継手機構は、外嵌部材の内向き周溝と内嵌部材の外向き周溝とが同じ溝幅となるように形成しておき、外嵌部材と内嵌部材とを互いに嵌合させた状態において内向き周溝と外向き周溝とを互いに対向させて、予め内向き周溝に内蔵したキー部材を外向き周溝側に押出して、内向き周溝と外向き周溝とに亘って嵌合することによって、一対の鋼管杭どうしを該鋼管杭の長手方向に相対移動することを不可能に連結する構成となっている。 The joint mechanism is formed so that the inward circumferential groove of the outer fitting member and the outer circumferential groove of the inner fitting member have the same groove width, and the outer fitting member and the inner fitting member are fitted to each other. In this state, the inward circumferential groove and the outward circumferential groove are opposed to each other, and a key member previously built in the inward circumferential groove is extruded toward the outward circumferential groove, so that it extends over the inward circumferential groove and the outward circumferential groove. By fitting together, the pair of steel pipe piles are configured to be impossible to relatively move in the longitudinal direction of the steel pipe piles.

特許第３１５８０８１号公報Japanese Patent No. 3158081

　しかし、内向き周溝に予めキー部材を内蔵しておき、連結時に外向き周溝に向けて押出す構成は、構造が複雑になりがちであり、さらに内向き周溝にキー部材全体を内蔵可能な溝幅が必要なため前記外嵌部材の厚みがその分厚くなってしまうという問題があった。 However, the structure in which the key member is built in the inward circumferential groove in advance and pushed toward the outward circumferential groove when connected tends to be complicated, and the entire key member is built in the inward circumferential groove. Since a possible groove width is required, there is a problem that the thickness of the outer fitting member is increased accordingly.

　本発明は上記実情に鑑みてなされたものであって、一対の鋼管を連結する構成の簡素化と、コストの低減を図ることを目的とする。 The present invention has been made in view of the above circumstances, and aims to simplify the configuration for connecting a pair of steel pipes and reduce the cost.

　本発明に係る継手機構の第一特徴構成は、鋼管の継手機構であって、前記鋼管の一端に設けられた第一内側継手と、他端に設けられた第二内側継手と、一対の前記鋼管を連結するために、一方の前記鋼管の前記第一内側継手と他方の前記鋼管の前記第二内側継手とを隣接させた状態において、前記第一内側継手と前記第二内側継手とに跨って周設される外側継手と、前記第一内側継手と前記外側継手、及び、前記第二内側継手と前記外側継手と係合して前記一対の鋼管どうしが該鋼管の長手方向に相対移動することを防止するキー部材とを備え、前記第一内側継手及び前記第二内側継手のそれぞれの外周には外向き周溝が備えられ、前記外側継手の内周には、前記第一内側継手及び前記第二内側継手のそれぞれの外周に備えられた前記外向き周溝と対向する内向き周溝が備えられ、前記外側継手には、前記外側継手の外周面から、前記外向き周溝と前記内向き周溝とから構成されるキー溝に前記キー部材を挿通するための開口部が備えられている点にある。 The first characteristic configuration of the joint mechanism according to the present invention is a steel pipe joint mechanism, a first inner joint provided at one end of the steel pipe, a second inner joint provided at the other end, and a pair of the above In order to connect the steel pipes, the first inner joint of one of the steel pipes and the second inner joint of the other steel pipe are adjacent to each other, straddling the first inner joint and the second inner joint. The outer joint, the first inner joint and the outer joint, and the second inner joint and the outer joint, and the pair of steel pipes move relative to each other in the longitudinal direction of the steel pipe. A key member for preventing this, an outer circumferential groove is provided on the outer periphery of each of the first inner joint and the second inner joint, and on the inner periphery of the outer joint, the first inner joint and The outward direction provided on the outer periphery of each of the second inner joints An inward circumferential groove facing the circumferential groove is provided, and the outer joint is provided on the outer joint with a key groove formed from the outer circumferential groove and the inward circumferential groove. It is in the point provided with the opening part for penetrating.

　一方の鋼管の一端に設けられた第一内側継手と他方の鋼管の他端に設けられた第二内側継手とを隣接させるとともに、前記第一内側継手と前記第二内側継手とに跨って外側継手を周設したあとに、前記外側継手に形成された開口部を介して、キー部材を、前記外側継手の外周面から、外向き周溝と内向き周溝とから形成されるキー溝に配置することができる。したがって、従来の継手機構のように、予めキー部材を内向き周溝内に内蔵しておく必要がない分、外側継手の厚みを薄くすることができ、材料コストの低減を図ることができる。また、第一内側継手と第二内側継手とを同じ形状に構成することができるため、加工コストの低減も図ることができる。 A first inner joint provided at one end of one steel pipe and a second inner joint provided at the other end of the other steel pipe are adjacent to each other, and the outer side straddles the first inner joint and the second inner joint. After the joint is provided around, the key member is changed from the outer peripheral surface of the outer joint to the key groove formed by the outward circumferential groove and the inward circumferential groove through the opening formed in the outer joint. Can be arranged. Therefore, unlike the conventional joint mechanism, the thickness of the outer joint can be reduced because the key member does not need to be built in the inward circumferential groove in advance, and the material cost can be reduced. In addition, since the first inner joint and the second inner joint can be configured in the same shape, the processing cost can be reduced.

　同第二特徴構成は、前記キー部材は、円環の一部を構成する複数の分割キー部材と、前記分割キー部材の機能を有するとともに前記開口部を閉鎖する機能を有する閉鎖部材とを備えている点にある。 In the second characteristic configuration, the key member includes a plurality of split key members constituting a part of a ring, and a closing member having a function of the split key member and a function of closing the opening. There is in point.

　開口部には、分割キー部材と同様に前記一対の鋼管どうしが該鋼管の長手方向に相対移動することを防止する機能を有する閉鎖部材を配置することによって、キー溝に配置された前記分割キー部材が前記開口部から外に抜け落ちることを防ぐことができる。 Similar to the split key member, the opening portion is provided with a closing member having a function of preventing the pair of steel pipes from moving relative to each other in the longitudinal direction of the steel pipe. It is possible to prevent the member from falling out of the opening.

　同第三特徴構成は、前記外側継手は、前記第一内側継手及び前記第二内側継手の周囲に並設される複数の単位部材から構成されている点にある。 The third characteristic configuration is that the outer joint is composed of a plurality of unit members arranged in parallel around the first inner joint and the second inner joint.

　外側継手を、例えば作業員が手を用いて持ち上げることができる程度の大きさの複数の単位部材から構成することによって、クレーン等の機械による吊り上げ作業が不要となるため、鋼管の連結の作業性が向上する。 Since the outer joint is made up of a plurality of unit members that are large enough to be lifted by a worker by hand, for example, lifting work by a machine such as a crane becomes unnecessary. Will improve.

　同第四特徴構成は、前記複数の単位部材は、前記開口部が備えられている開口単位部材と、前記開口部が備えられていない標準単位部材とを含んでいる点にある。 The fourth characteristic configuration is that the plurality of unit members include an opening unit member provided with the opening and a standard unit member not provided with the opening.

　キー部材を挿通可能な開口部を備える開口単位部材を任意の箇所に配置することができる。すなわち現場の作業スペース等の事情にあわせてキー部材をキー溝に挿通する開口部を任意に設定することができる点で作業性がよい。 The opening unit member having an opening through which the key member can be inserted can be arranged at an arbitrary position. That is, the workability is good in that the opening for inserting the key member into the key groove can be arbitrarily set according to the circumstances of the work space at the site.

　同第五特徴構成は、前記複数の単位部材は、前記第一内側継手と前記第二内側継手とを当接させた状態において、前記第一内側継手と前記第二内側継手とに跨って周設される基準単位部材と、前記第一内側継手と前記第二内側継手とを離間させた状態において、前記第一内側継手と前記第二内側継手とに跨って周設される延長単位部材とを含んでいる点にある。 In the fifth characteristic configuration, the plurality of unit members surround the first inner joint and the second inner joint in a state where the first inner joint and the second inner joint are in contact with each other. A reference unit member provided, and an extended unit member provided around the first inner joint and the second inner joint in a state where the first inner joint and the second inner joint are separated from each other. It is in that it contains.

　前記第一内側継手と前記第二内側継手とに跨って周設される前記外側継手のうち一部を基準単位部材から構成し、他部を延長単位部材から構成することによって、前記一方の鋼管の軸心と、前記他方の鋼管の軸心とを傾けることができる。 By configuring a part of the outer joint provided around the first inner joint and the second inner joint from a reference unit member and configuring the other part from an extension unit member, the one steel pipe And the axis of the other steel pipe can be tilted.

　すなわち、鋼管を上下に連結しながら地中に打ち込むにあたり、先行して地中に打ち込んだ鋼管の姿勢が所定姿勢、例えば鉛直姿勢から外れているときは、軸芯どうしを相対的に傾けて、その鋼管に連結される後続の鋼管の姿勢が所定姿勢、例えば鉛直姿勢に近い姿勢になるように修正しながら、一対の鋼管を連結することができる。 That is, when driving the steel pipe into the ground while connecting the steel pipe up and down, when the attitude of the steel pipe previously driven into the ground is out of a predetermined attitude, for example, a vertical attitude, the axes are relatively inclined, The pair of steel pipes can be connected while correcting the posture of the subsequent steel pipe connected to the steel pipe so as to be a predetermined posture, for example, a posture close to a vertical posture.

　同第六特徴構成は、前記第一内側継手及び前記第二内側継手は、それぞれ、基部と前記基部に延設された内嵌部を備え、前記基部の前記内嵌部に臨む端面には係合凹部が円環状に備えられ、前記内嵌部の外周に前記外向き周溝が円環状に備えられ、前記基準単位部材及び前記延長単位部材の上下端部には、前記基準単位部材及び前記延長単位部材を前記第一内側継手及び前記第二内側継手とに跨って周設したときに前記係合凹部に係合可能な一対の係合凸部が備えられ、前記基準単位部材及び前記延長単位部材の内周に一対の前記外向き周溝に対向する一対の前記内向き周溝が備えられ、前記基準単位部材の一対の前記内向き周溝間の距離は、前記第一内側継手と前記第二内側継手とが当接したときの、前記一対の外向き周溝間の距離と同じ距離に設定され、前記延長単位部材の一対の前記内向き周溝間の距離は、前記第一内側継手と前記第二内側継手とが離間したときの、前記一対の外向き周溝間と同じ距離に設定されている点にある。 In the sixth feature configuration, each of the first inner joint and the second inner joint includes a base portion and an inner fitting portion extending to the base portion, and the end surface of the base portion facing the inner fitting portion is engaged. A mating recess is provided in an annular shape, and the outward circumferential groove is provided in an annular shape on the outer periphery of the inner fitting portion. The upper and lower ends of the reference unit member and the extension unit member are provided with the reference unit member and When the extension unit member is provided so as to straddle the first inner joint and the second inner joint, a pair of engagement convex portions that can be engaged with the engagement concave portion are provided, and the reference unit member and the extension A pair of inward circumferential grooves facing the pair of outward circumferential grooves is provided on an inner circumference of the unit member, and a distance between the pair of inward circumferential grooves of the reference unit member is the same as that of the first inner joint. The same distance as the distance between the pair of outward circumferential grooves when the second inner joint abuts. The distance between the pair of inward circumferential grooves of the extension unit member is the same as the distance between the pair of outward circumferential grooves when the first inner joint and the second inner joint are separated from each other. It is at a point set as a distance.

　前記基準単位部材や前記延長単位部材を前記第一内側継手及び前記第二内側継手とに跨って周設したときに、係合凸部と係合凹部とが係合することによって前記基準単位部材や前記延長単位部材が外方へ脱落することが防止される。前記一方の鋼管の軸心と、前記他方の鋼管の軸心とを傾けたときであっても、キー部材をキー溝に挿通することができる。 When the reference unit member or the extension unit member is provided so as to straddle the first inner joint and the second inner joint, the reference projection member and the engagement recess are engaged with each other to engage the reference unit member. And the extension unit member is prevented from falling outward. Even when the axis of the one steel pipe and the axis of the other steel pipe are inclined, the key member can be inserted into the key groove.

　同第七の特徴構成は、少なくとも前記外側継手はストレートシーム鋼管から形成され、
　前記ストレートシーム鋼管が有する接合部は、前記外側継手のうち前記開口部とは重ならない位置に配設されていることを特徴とする点にある。 The seventh characteristic configuration is that at least the outer joint is formed of a straight seam steel pipe,
The joint part which the said straight seam steel pipe has is in the point arrange | positioned in the position which does not overlap with the said opening part among the said outer joints.

　ストレートシーム鋼管は、板巻加工法を用いて製造される。板巻加工法は、シームレス鋼管を製造するリング鍛造などの工法にくらべて安価である。外側継手をストレートシーム鋼管から形成することによって、安価に外側継手が得られる。
　しかし、ストレートシーム鋼管はその長手方向に沿って接合部を有し、シームレス鋼管のように周方向に均質ではないため、周方向において同一の剛性が得られず、内圧やねじれに弱い。
　また、外側継手のうち開口部が形成されている周方向部分は、その箇所において材料が少ないため、その他の周方向部分にくらべて剛性が低い。
　そこで、開口部は、ストレートシーム鋼管が有する接合部を跨ぐ位置ではない位置となるように外側継手に設けられる。
　開口部が形成されている周方向部分と接合部とが、ストレートシーム鋼管の長手方向に沿って重ならないようにすることによって、外側継手において一部がその他の部分よりも剛性が低くなりすぎることを防止できる。 A straight seam steel pipe is manufactured using a sheet winding method. The plate winding method is less expensive than methods such as ring forging that produce seamless steel pipes. By forming the outer joint from a straight seam steel pipe, the outer joint can be obtained at low cost.
However, straight seam steel pipes have joints along their longitudinal direction, and are not homogeneous in the circumferential direction like seamless steel pipes, so the same rigidity cannot be obtained in the circumferential direction and they are vulnerable to internal pressure and torsion.
Moreover, since the circumferential direction part in which the opening part is formed among outer joints has few materials in the location, compared with other circumferential direction parts, rigidity is low.
Then, an opening part is provided in an outer joint so that it may become a position which is not a position which straddles the junction part which a straight seam steel pipe has.
By preventing the circumferential portion where the opening is formed and the joint from overlapping the longitudinal direction of the straight seam steel pipe, some of the outer joints are too stiffer than the others. Can be prevented.

　同第八の特徴構成は、少なくとも前記外側継手はストレートシーム鋼管から形成され、
　前記ストレートシーム鋼管が有する接合部は、前記内側継手における前記閉鎖部材を固定する位置とは重ならない位置に配設されている点にある。 In the eighth characteristic configuration, at least the outer joint is formed of a straight seam steel pipe,
The joint part which the said straight seam steel pipe has exists in the point arrange | positioned in the position which does not overlap with the position which fixes the said closure member in the said inner joint.

　ストレートシーム鋼管は、板巻加工法を用いて製造される。板巻加工法は、シームレス鋼管を製造するリング鍛造などの工法にくらべて安価である。外側継手をストレートシーム鋼管から形成することによって、安価に外側継手が得られる。
　しかし、ストレートシーム鋼管はその長手方向に沿って接合部を有し、シームレス鋼管のように周方向に均質ではないため、周方向において同一の剛性が得られず、内圧やねじれに弱い。
　また、内側継手における前記閉鎖部材を固定する位置には、固定機構としての例えばボルトを固定するためのボルト穴が形成されておりその位置の周方向部分は、その箇所において材料が少ないため、その他の周方向部分にくらべて剛性が低い。
　そこで、内側継手における前記閉鎖部材を固定する位置は、ストレートシーム鋼管が有する接合部を跨ぐ位置ではない位置となるように内側継手に設けられる。
　内側継手における前記閉鎖部材を固定する位置と接合部とが、ストレートシーム鋼管の長手方向に沿って重ならないようにすることによって、内側継手において一部がその他の部分よりも剛性が低くなりすぎることを防止できる。 A straight seam steel pipe is manufactured using a sheet winding method. The plate winding method is less expensive than methods such as ring forging that produce seamless steel pipes. By forming the outer joint from a straight seam steel pipe, the outer joint can be obtained at low cost.
However, straight seam steel pipes have joints along their longitudinal direction, and are not homogeneous in the circumferential direction like seamless steel pipes, so the same rigidity cannot be obtained in the circumferential direction and they are vulnerable to internal pressure and torsion.
In addition, a bolt hole for fixing, for example, a bolt as a fixing mechanism is formed at a position where the closing member in the inner joint is fixed, and the circumferential portion at that position is less material at that location. Rigidity is lower than the circumferential part.
Then, the position which fixes the said closure member in an inner joint is provided in an inner joint so that it may become a position which does not straddle the junction part which a straight seam steel pipe has.
In the inner joint, the position where the closing member is fixed and the joint do not overlap along the longitudinal direction of the straight seam steel pipe, so that part of the inner joint is too stiffer than the other parts. Can be prevented.

　同第九の特徴構成は、少なくとも前記外側継手はストレートシーム鋼管から形成され、
　前記ストレートシーム鋼管が有する接合部は、回転抑止キー溝を構成する前記内側継手に形成された座ぐり部及び前記外側継手に形成された座ぐり部とは重ならない位置に配設されている点にある。 In the ninth feature configuration, at least the outer joint is formed of a straight seam steel pipe,
The joint part which the said straight seam steel pipe has is arranged in the position which does not overlap with the counterbore part formed in the inner joint and the counterbore part formed in the outer joint which constitute rotation prevention keyway It is in.

　ストレートシーム鋼管は、板巻加工法を用いて製造される。板巻加工法は、シームレス鋼管を製造するリング鍛造などの工法にくらべて安価である。外側継手をストレートシーム鋼管から形成することによって、安価に外側継手が得られる。
　しかし、ストレートシーム鋼管はその長手方向に沿って接合部を有し、シームレス鋼管のように周方向に均質ではないため、周方向において同一の剛性が得られず、内圧やねじれに弱い。
　また、回転抑止キー溝を構成する前記内側継手に形成された座ぐり部及び前記外側継手に形成された座ぐり部が形成されている周方向部分は、その箇所において材料が少ないため、その他の周方向部分にくらべて剛性が低い。
　そこで、回転抑止キー溝を構成する前記内側継手に形成された座ぐり部及び前記外側継手に形成された座ぐり部は、ストレートシーム鋼管が有する接合部を跨ぐ位置ではない位置となるように内側継手及び外側継手に設けられる。
　回転抑止キー溝を構成する前記内側継手に形成された座ぐり部及び前記外側継手に形成された座ぐり部が形成されている周方向部分と接合部とが、ストレートシーム鋼管の長手方向に沿って重ならないようにすることによって、内側継手及び外側継手において一部がその他の部分よりも剛性が低くなりすぎることを防止できる。 A straight seam steel pipe is manufactured using a sheet winding method. The plate winding method is less expensive than methods such as ring forging that produce seamless steel pipes. By forming the outer joint from a straight seam steel pipe, the outer joint can be obtained at low cost.
However, straight seam steel pipes have joints along their longitudinal direction, and are not homogeneous in the circumferential direction like seamless steel pipes, so the same rigidity cannot be obtained in the circumferential direction and they are vulnerable to internal pressure and torsion.
In addition, the circumferential portion where the counterbore portion formed on the inner joint and the counterbore portion formed on the outer joint that form the rotation suppression keyway are made of less material at that location. Less rigid than the circumferential part.
Therefore, the counterbore part formed on the inner joint and the counterbore part formed on the outer joint that constitute the rotation suppression keyway are positioned so that they are not positioned over the joint part of the straight seam steel pipe. Provided on joints and outer joints.
A counterbore part formed in the inner joint constituting the rotation suppression keyway, a circumferential part in which the counterbore part formed in the outer joint and the joint part are formed along the longitudinal direction of the straight seam steel pipe By preventing them from overlapping each other, it is possible to prevent a part of the inner joint and the outer joint from becoming too rigid compared to the other parts.

　本発明に係る連結方法の第一特徴構成は、上述した第一から第七のいずれか一つの特徴構成を備えた継手機構を用いて一対の鋼管を連結する連結方法であって、一方の鋼管の一端に設けられた第一内側継手に外側継手を周設するステップと、前記第一内側継手と他方の鋼管の他端に設けられた第二内側継手とを隣接させて、前記外側継手の内面に前記第二内側継手を挿入し、前記外側継手を前記第一内側継手と前記第二内側継手とに跨らせるステップと、前記外側継手に備えられた開口部を介して、前記第一内側継手と前記外側継手、及び、前記第二内側継手と前記外側継手と係合して前記一対の鋼管どうしが該鋼管の長手方向に相対移動することを防止するキー部材を、前記外側継手の外周面から、前記第一内側継手及び前記第二内側継手のそれぞれの外周に備えられた外向き周溝と、前記外向き周溝と対向するように前記外側継手の内周に備えられた内向き周溝とから構成されるキー溝に挿通し、前記キー溝に挿通した前記キー部材を、前記キー溝内において周方向にスライドさせ、前記キー溝のうち前記開口部に対応する箇所を除いて、前記キー溝内の所定位置に前記キー部材を配置するステップと、前記キー部材の機能を有するとともに前記開口部を閉鎖する機能を有する閉鎖部材を用いて前記開口部を閉鎖するステップと、を備えている点にある。 1st characteristic structure of the connection method which concerns on this invention is a connection method which connects a pair of steel pipes using the joint mechanism provided with any one 1st-7th characteristic structure mentioned above, Comprising: One steel pipe A first inner joint provided at one end of the outer joint and a first inner joint provided adjacent to the second inner joint provided at the other end of the other steel pipe, Inserting the second inner joint into an inner surface, straddling the outer joint between the first inner joint and the second inner joint, and through the opening provided in the outer joint, the first A key member that engages with the inner joint and the outer joint, and the second inner joint and the outer joint to prevent the pair of steel pipes from moving relative to each other in the longitudinal direction of the steel pipe, From the outer peripheral surface, the first inner joint and the second inner joint Each of the outer circumferential groove provided on the outer periphery of each of the outer joint and the outer circumferential groove provided on the inner periphery of the outer joint so as to face the outer circumferential groove. The key member inserted through the key groove is slid in the circumferential direction in the key groove, and the key member is disposed at a predetermined position in the key groove except for a portion corresponding to the opening in the key groove. And a step of closing the opening using a closing member having a function of the key member and a function of closing the opening.

　同第二特徴構成は、上述した第五から第七のいずれか一つの特徴構成を備えた継手機構を用いて一対の鋼管を連結する連結方法であって、一方の鋼管の一端に設けられた第一内側継手に外側継手を周設するステップと、前記第一内側継手と他方の鋼管の他端に設けられた第二内側継手とを隣接させて、前記外側継手の内面に前記第二内側継手を挿入し、前記外側継手を前記第一内側継手と前記第二内側継手とに跨らせるステップと、前記外側継手に備えられた開口部を介して、前記第一内側継手と前記外側継手、及び、前記第二内側継手と前記外側継手と係合して前記一対の鋼管どうしが該鋼管の長手方向に相対移動することを防止するキー部材を、前記外側継手の外周面から、前記第一内側継手及び前記第二内側継手のそれぞれの外周に備えられた外向き周溝と、前記外向き周溝と対向するように前記外側継手の内周に備えられた内向き周溝とから構成されるキー溝に挿通し、前記キー溝に挿通した前記キー部材を、前記キー溝内において周方向にスライドさせ、前記キー溝のうち前記開口部に対応する箇所を除いて、前記キー溝内の所定位置に前記キー部材を配置するステップと、前記キー部材の機能を有するとともに前記開口部を閉鎖する機能を有する閉鎖部材を用いて前記開口部を閉鎖するステップと、を備え、前記外側継手を周設するステップにおいて、前記第一内側継手と前記第二内側継手とに跨って周設される前記外側継手を、前記外側継手を構成する複数の単位部材のうち、一部の単位部材を前記基準単位部材から構成し、他部の単位部材を前記延長単位部材から構成することによって、前記一方の鋼管の軸心と、前記他方の鋼管の軸心とを傾けるステップを備えている点にある。 The second characteristic configuration is a connection method for connecting a pair of steel pipes using the joint mechanism having any one of the fifth to seventh characteristic configurations described above, and is provided at one end of one steel pipe. A step of arranging an outer joint around the first inner joint, and a second inner joint provided at the other end of the first inner joint and the other steel pipe are adjacent to each other, and an inner surface of the outer joint is connected to the second inner joint. Inserting a joint and straddling the outer joint between the first inner joint and the second inner joint; and through the opening provided in the outer joint, the first inner joint and the outer joint. And a key member that engages with the second inner joint and the outer joint to prevent the pair of steel pipes from moving relative to each other in the longitudinal direction of the steel pipe from the outer peripheral surface of the outer joint. On the outer peripheries of one inner joint and the second inner joint Inserted into the key groove composed of the obtained outward circumferential groove and the inward circumferential groove provided on the inner periphery of the outer joint so as to face the outward circumferential groove, and inserted into the key groove The key member is slid in the circumferential direction in the key groove, and the key member is disposed at a predetermined position in the key groove except for a portion corresponding to the opening in the key groove; A step of closing the opening using a closing member having a function of a key member and a function of closing the opening, and in the step of surrounding the outer joint, the first inner joint and the step Among the plurality of unit members constituting the outer joint, the outer joint provided around the second inner joint, a part of the unit members is configured from the reference unit member, and the other unit members are The extension unit member By configuring, the axis of the one of the steel pipe, in that it includes the step of tilting the axis of the other steel pipe.

鋼管及び継手機構の説明図Illustration of steel pipe and joint mechanism 外側継手の斜視図Perspective view of outer joint 内側継手と外側継手についての説明図Illustration of inner and outer joints 内側継手と外側継手についての説明図Illustration of inner and outer joints 内側継手と外側継手についての説明図Illustration of inner and outer joints 内側継手と外側継手についての側断面図Side sectional view of inner and outer joints キー部材による係合についての説明図Explanatory drawing about engagement by key member キー部材による係合についての側断面図Side sectional view of engagement by key member キー部材による係合についての平断面図Plan view of engagement with key member 閉鎖部材についての説明図Explanatory drawing about closure member 閉鎖部材についての側断面図Side sectional view of the closure 閉鎖部材についての平断面図Cross section of the closing member 継手機構の使用方法の説明図Illustration of how to use the joint mechanism 別実施形態による外側継手の斜視図Perspective view of outer joint according to another embodiment 別実施形態による外側継手の斜視図Perspective view of outer joint according to another embodiment 別実施形態による外側継手の要部の平断面図Plan sectional drawing of the principal part of the outer joint by another embodiment 別実施形態による外側継手の要部の平断面図Plan sectional drawing of the principal part of the outer joint by another embodiment 別実施形態による外側継手の斜視図Perspective view of outer joint according to another embodiment 別実施形態による外側継手の要部の側断面図Side sectional view of an essential part of an outer joint according to another embodiment 別実施形態による外側継手の要部の側断面図Side sectional view of an essential part of an outer joint according to another embodiment 別実施形態による外側継手の要部の側断面図Side sectional view of an essential part of an outer joint according to another embodiment 別実施形態による鋼管の継手機構の説明図Explanatory drawing of the joint mechanism of the steel pipe by another embodiment

　以下に本発明による鋼管の継手機構及び連結方法を図面に基づいて説明する。
　図１は、鋼管の一例としての、油圧ハンマー、圧入機、回転圧入機などを用いて地中に打ち込まれる外周面形状が円筒状の鋼管杭１と、一対の鋼管杭１を鋼管杭１の長手方向に互いに連結するための継手機構とを示している。なお、すべての鋼管杭１は同一の構成であるが、一対の鋼管杭１のうち、一方の鋼管杭１と他方の鋼管杭１を区別して説明する必要があるところについては、一方の鋼管杭１側の各構成の符号に添え字Ａを付し、他方の鋼管杭１側の各構成の符号に添え字Ｂを付している。 A steel pipe joint mechanism and connection method according to the present invention will be described below with reference to the drawings.
FIG. 1 shows a steel pipe pile 1 having a cylindrical outer peripheral surface shape that is driven into the ground using a hydraulic hammer, a press-fitting machine, a rotary press-fitting machine, etc. as an example of a steel pipe, and a pair of steel pipe piles 1 Fig. 2 shows a joint mechanism for connecting with each other in the longitudinal direction. In addition, although all the steel pipe piles 1 are the same structures, about the place which needs to distinguish and explain one steel pipe pile 1 and the other steel pipe pile 1 among a pair of steel pipe piles 1, one steel pipe pile The subscript A is attached to the reference numerals of the components on the 1 side, and the subscript B is attached to the reference numerals of the components on the other side of the steel pipe pile 1.

　鋼管杭１（１Ａ，１Ｂ）は、管体２（２Ａ，２Ｂ）の両端部に略円筒状の内側継手１０を同芯状に溶接して構成してある。 The steel pipe pile 1 (1A, 1B) is configured by welding a substantially cylindrical inner joint 10 concentrically to both ends of the pipe body 2 (2A, 2B).

　図１に示すように、内側継手１０は、管体２の外径よりやや大きい外径の基部１１に、その基部１１よりも外径が小径の内嵌部１２を延設してある。本実施形態においては、基部１１の外径は、管体２の外径より１８ｍｍ程度大きい。
　内嵌部１２の外周には、後述する円環状のキー部材３０を係合するための一条の外向き周溝１３を円環状に形成してある。基部１１の内嵌部１２に臨む端面には、後述する外側継手２０の端部に備えられた係合凸部２４を係合させるための係合凹部１４を円環状に形成してある。 As shown in FIG. 1, the inner joint 10 has an inner fitting portion 12 having an outer diameter smaller than that of the base portion 11 extending from a base portion 11 having an outer diameter slightly larger than the outer diameter of the tube body 2. In the present embodiment, the outer diameter of the base 11 is about 18 mm larger than the outer diameter of the tube body 2.
On the outer periphery of the inner fitting portion 12, a single outward circumferential groove 13 for engaging an annular key member 30 described later is formed in an annular shape. An engagement recess 14 for engaging an engagement projection 24 provided at an end of the outer joint 20 described later is formed in an annular shape on the end surface of the base 11 facing the inner fitting portion 12.

　なお、管体２の両端部に溶接される内側継手１０は同一の構成であるが、鋼管杭１を地中に打ち込む際に下側に位置する内側継手１０側の各構成に添え字Ａを付し、上側に位置する内側継手１０側の各構成に添え字Ｂを付している。すなわち、一対の内側継手１０Ａ，１０Ｂのいずれか一方が第一内側継手であり他方が第二内側継手である。前記第一内側継手と前記第二内側継手とを同一の構成とすることによって、別の構成とする場合にくらべて製造コストを低減することができる。 In addition, although the inner joint 10 welded to the both ends of the pipe body 2 is the same structure, subscript A is added to each structure by the side of the inner joint 10 located below when driving the steel pipe pile 1 in the ground. A subscript B is added to each component on the inner joint 10 side located on the upper side. That is, one of the pair of

inner joints

10A and 10B is the first inner joint, and the other is the second inner joint. By setting the first inner joint and the second inner joint to the same configuration, the manufacturing cost can be reduced as compared with the case of using different configurations.

　図１及び図２に示すように、外側継手２０は、管体２の外径よりやや大きい外径と、内側継手１０を嵌挿可能な大きさの内径を有する鋳鋼製の円筒状体を、周方向に８等分に分割することによって形成される８個の単位部材２１から構成されている。本実施形態においては、外側継手２０の外径は、管体２の外径より１８ｍｍ程度大きい。 As shown in FIGS. 1 and 2, the outer joint 20 is a cylindrical body made of cast steel having an outer diameter slightly larger than the outer diameter of the tube body 2 and an inner diameter that allows the inner joint 10 to be inserted. It consists of eight unit members 21 formed by dividing into eight equal parts in the circumferential direction. In the present embodiment, the outer diameter of the outer joint 20 is about 18 mm larger than the outer diameter of the tube body 2.

　なお、８等分は例示であり、分割によって得られる単位部材２１の数は８個より少なくても多くてもよいが、分割された各単位部材２１の大きさが、作業員が手を用いて持ち上げることができる程度の大きさであることが好ましい。また、単位部材２１は、ストレートシーム鋼管を分割するという簡単な製造方法を用いることによって、例えば鉄板を曲げ加工するなどして一つずつ製造する場合にくらべて製造コストを低減できる Note that eight equal parts are examples, and the number of unit members 21 obtained by the division may be less than or greater than eight, but the size of each of the divided unit members 21 is determined by the operator's hands. It is preferable that the size is such that it can be lifted up. Moreover, the unit member 21 can reduce a manufacturing cost compared with the case where it manufactures one by one, for example, by bending an iron plate by using the simple manufacturing method of dividing | segmenting a straight seam steel pipe.

　８個の単位部材２１から構成される外側継手２０の内周には、内側継手１０Ａ及び内側継手１０Ｂのそれぞれに備えられた外向き周溝１３（１３Ａ，１３Ｂ）と同じ程度の深さで、並行な二条の円環状の内向き周溝２３（２３Ａ，２３Ｂ）が、外側継手２０を内側継手１０（１０Ａ，１０Ｂ）の内嵌部１２（１２Ａ，１２Ｂ）に周設させた状態であるときに、外向き周溝１３（１３Ａ，１３Ｂ）に対向可能な位置に備えてある。 In the inner periphery of the outer joint 20 composed of eight unit members 21, at the same depth as the outward circumferential grooves 13 (13 A, 13 B) provided in each of the inner joint 10 A and the inner joint 10 B, When two parallel circular inward circumferential grooves 23 (23A, 23B) are in a state where the outer joint 20 is provided around the inner fitting portion 12 (12A, 12B) of the inner joint 10 (10A, 10B). Are provided at positions that can face the outward circumferential grooves 13 (13A, 13B).

　内側継手１０に外側継手２０を周設させた状態において、外向き周溝１３と内向き周溝２３とから構成される円環状の空間がキー部材３０を嵌合するためのキー溝となる。 In a state where the outer joint 20 is provided around the inner joint 10, an annular space formed by the outward circumferential groove 13 and the inward circumferential groove 23 becomes a key groove for fitting the key member 30.

このキー溝に、すなわち外向き周溝１３と内向き周溝２３とに亘ってキー部材３０を係合することにより、内側継手１０Ａと外側継手２０、及び内側継手１０Ｂと外側継手２０とが互いに係合され一対の鋼管杭１Ａ，１Ｂが鋼管杭１の長手方向に連結される。 By engaging the key member 30 in this key groove, that is, across the outward circumferential groove 13 and the inward circumferential groove 23, the inner joint 10A and the outer joint 20, and the inner joint 10B and the outer joint 20 are mutually connected. The pair of steel pipe piles 1 A and 1 B are engaged and connected in the longitudinal direction of the steel pipe pile 1.

　各単位部材２１には、図中の上下端部に係合凸部２４（２４Ａ，２４Ｂ）を形成してある。単位部材２１を内側継手１０に周設したときに、係合凸部２４（２４Ａ，２４Ｂ）が、内側継手１０の係合凹部１４（１４Ａ，１４Ｂ）に係合することによって単位部材２１が外方へ脱落することが防止される。 Each unit member 21 is formed with engaging convex portions 24 (24A, 24B) at the upper and lower end portions in the drawing. When the unit member 21 is provided around the inner joint 10, the engagement convex portion 24 (24 A, 24 B) engages with the engagement concave portion 14 (14 A, 14 B) of the inner joint 10, so that the unit member 21 is removed. Is prevented from falling off.

　８個の単位部材２１のうち、４個の単位部材２１には、内側継手１０に外側継手２０を周設させた状態において、キー部材３０を外向き周溝１３と内向き周溝２３とから構成されるキー溝に配置するために、外向き周溝１３（１３Ａ，１３Ｂ）の溝の長手方向における一部を外向き周溝１３（１３Ａ，１３Ｂ）の全幅に亘って外方に臨ませるための２個の開口部２２（２２Ａ，２２Ｂ）を備えている。これらの単位部材２１が開口単位部材２１Ａである。 Of the eight unit members 21, the four unit members 21 include the key member 30 from the outward circumferential groove 13 and the inward circumferential groove 23 in a state where the outer joint 20 is provided around the inner joint 10. In order to arrange the key groove to be configured, a part of the outward circumferential groove 13 (13A, 13B) in the longitudinal direction is exposed outward over the entire width of the outward circumferential groove 13 (13A, 13B). Two openings 22 (22A, 22B) are provided. These unit members 21 are opening unit members 21A.

　開口部２２（２２Ａ，２２Ｂ）は、各内向き周溝２３（２３Ａ，２３Ｂ）の形成箇所に沿って、内向き周溝２３（２３Ａ，２３Ｂ）の全幅に亘って切り取った形状に構成されている。 The opening 22 (22A, 22B) is configured in a shape cut out over the entire width of the inward circumferential groove 23 (23A, 23B) along the location where each inward circumferential groove 23 (23A, 23B) is formed. Yes.

　開口部２２（２２Ａ，２２Ｂ）を介して、外側継手２０の外周面から、外向き周溝１３と内向き周溝２３とから構成されるキー溝にキー部材３０が挿通される。 Through the opening 22 (22A, 22B), the key member 30 is inserted from the outer peripheral surface of the outer joint 20 into a key groove constituted by the outward circumferential groove 13 and the inward circumferential groove 23.

　その他の４個の単位部材２１は、開口部２２（２２Ａ，２２Ｂ）を備えていないことを除いて、開口単位部材２１Ａと同一の構成である。これらの単位部材２１が標準単位部材２１Ｂである。 The other four unit members 21 have the same configuration as the opening unit member 21A except that the opening unit 22 (22A, 22B) is not provided. These unit members 21 are standard unit members 21B.

　本実施形態においては、それぞれ４個ずつの開口単位部材２１Ａ及び標準単位部材２１Ｂが、内側継手１０の周囲に交互に並設され円筒状の外側継手２０を構成する。開口単位部材２１Ａは開口部２２が形成されているため、標準単位部材２１Ｂよりも剛性が低い。そのため、開口単位部材２１Ａと標準単位部材２１Ｂとを交互に並設することによって、外側継手２０の全体としての剛性の均質化が図られる。 In this embodiment, four open unit members 21A and four standard unit members 21B are arranged alternately around the inner joint 10 to constitute a cylindrical outer joint 20. Since the opening unit member 21A has the opening 22, the rigidity is lower than that of the standard unit member 21B. Therefore, the rigidity of the outer joint 20 as a whole can be homogenized by alternately arranging the opening unit members 21A and the standard unit members 21B.

　図１及び図１２に示すように、キー部材３０は、前記キー溝内に配置される部材であって、円環状体を、周方向に１６等分に分割したような複数個の円弧状の部材から構成されている。
　ただし、１６個の円弧状の部材のうち、１２個はキー溝に配置されてキー部材３０として機能する分割キー部材３１であり、あとの４個はキー部材３０としての機能を有するとともに開口部２２を閉鎖する機能を有する閉鎖部材３２である。
　一条のキー溝あたりに、１２個の分割キー部材３１と４個の閉鎖部材３２とが配置され、全体として円環状のキー部材３０を構成する。 As shown in FIGS. 1 and 12, the key member 30 is a member disposed in the key groove, and has a plurality of arcuate shapes obtained by dividing an annular body into 16 equal parts in the circumferential direction. It consists of members.
However, of the 16 arc-shaped members, 12 are divided key members 31 that are arranged in the key groove and function as the key member 30, and the remaining four have a function as the key member 30 and have openings. 22 is a closing member 32 having a function of closing 22.
Twelve divided key members 31 and four closing members 32 are arranged per one key groove, and constitute an annular key member 30 as a whole.

　分割キー部材３１は、鋼管杭１の長手方向に沿った方向の寸法が開口部２２の該方向の寸法より若干小さく設定され、鋼管杭１の周方向に沿った方向の寸法が開口部２２の該方向の寸法より若干小さく設定され、鋼管杭１の径方向に沿った方向の寸法が、キー溝、すなわち外向き周溝１３と内向き周溝２３の該方向の寸法より若干小さく設定されている。 In the split key member 31, the dimension in the direction along the longitudinal direction of the steel pipe pile 1 is set to be slightly smaller than the dimension in the direction of the opening 22, and the dimension in the direction along the circumferential direction of the steel pipe pile 1 is The dimension in the direction along the radial direction of the steel pipe pile 1 is set slightly smaller than the dimension in the direction, and the dimension in the direction of the key groove, that is, the outward circumferential groove 13 and the inward circumferential groove 23 is set slightly smaller. Yes.

　閉鎖部材３２は、鋼管杭１の長手方向に沿った方向の寸法が開口部２２の該方向の寸法より若干小さく設定され、鋼管杭１の周方向に沿った方向の寸法が開口部２２の該方向の寸法より若干小さく設定され、鋼管杭１の径方向に沿った方向の寸法が、外向き周溝１３の底面から開口部２２の表面までの寸法と略同じ大きさに設定されている。 The size of the closing member 32 in the direction along the longitudinal direction of the steel pipe pile 1 is set slightly smaller than the size in the direction of the opening 22, and the dimension in the direction along the circumferential direction of the steel pipe pile 1 is that of the opening 22. The dimension in the direction along the radial direction of the steel pipe pile 1 is set to be substantially the same as the dimension from the bottom surface of the outward circumferential groove 13 to the surface of the opening 22.

　さらに、閉鎖部材３２は、開口部２２に挿通したあとに、ボルト３３を用いて内側継手１０に対して固定可能に構成されている。なお、閉鎖部材３２は外側継手２０に対して固定される構成であってもよい。 Furthermore, the closing member 32 is configured to be fixed to the inner joint 10 using the bolt 33 after being inserted into the opening 22. The closing member 32 may be configured to be fixed to the outer joint 20.

　さらに、内側継手１０と外側継手２０の外周面の境界部には、外側継手２０を介して連結された内側継手１０Ａと内側継手１０Ｂの周方向の相対移動を抑止するための回転抑止キーが配設されている。 Further, a rotation inhibiting key for inhibiting relative movement in the circumferential direction of the inner joint 10A and the inner joint 10B connected via the outer joint 20 is arranged at the boundary between the outer peripheral surfaces of the inner joint 10 and the outer joint 20. It is installed.

　図示はしないが、前記回転抑止キーは、内側継手１０の基部１１の外周面に形成された座ぐり部と、前記座ぐり部に対向するように外側継手２０の外周面に形成された座ぐり部とから構成される回転抑止キー溝に跨設される。なお、前記回転抑止キーや前記座ぐり部の寸法及び数は、鋼管杭１の施工方法に応じて適当に設定される。前記回転抑止キーは、内側継手１０又は外側継手２０の一方と一体に形成してもよく、この場合は他方にのみ座ぐり部が形成される。 Although not shown, the rotation suppression key includes a counterbore formed on the outer peripheral surface of the base 11 of the inner joint 10 and a counterbore formed on the outer peripheral surface of the outer joint 20 so as to face the counterbore. And straddle the rotation inhibition keyway. In addition, the dimension and number of the said rotation suppression key and the said spot facing part are suitably set according to the construction method of the steel pipe pile 1. FIG. The rotation suppression key may be formed integrally with one of the inner joint 10 or the outer joint 20, and in this case, a counterbore is formed only on the other.

　内側継手１０Ａと内側継手１０Ｂの周方向の相対移動を抑止するための構成としては、前記回転抑止キーによるものに限らない。例えば、８個の単位部材２１のうちの少なくとも１つの単位部材の係合凸部２４と、該係合凸部２４が係合する係合凹部１４の、鋼管杭１の長手方向の長さを、その他の単位部材２１の係合凸部２４と異ならせる構成であってもよい。この場合は、単位部材２１が回転抑止キーと同様の機能を果たす。 The configuration for suppressing the relative movement of the inner joint 10A and the inner joint 10B in the circumferential direction is not limited to that using the rotation suppression key. For example, the length in the longitudinal direction of the steel pipe pile 1 of the engagement convex portion 24 of at least one unit member of the eight unit members 21 and the engagement concave portion 14 with which the engagement convex portion 24 engages is set. Further, it may be configured to be different from the engaging convex portion 24 of the other unit member 21. In this case, the unit member 21 performs the same function as the rotation suppression key.

　次に、図３から図１２に基づいて、油圧ハンマーなどを用いて地中に打ち込む工法において、先に打ち込まれている鋼管杭１Ａに後続の鋼管杭１Ｂを連結する場合を例に本発明による連結方法を説明する。 Next, based on FIGS. 3 to 12, in the method of driving into the ground using a hydraulic hammer or the like, the present invention is based on the case where the subsequent steel pipe pile 1B is connected to the steel pipe pile 1A previously driven. A connection method will be described.

　この、一対の鋼管杭１Ａ，１Ｂを連結する連結方法には上述の継手機構が用いられる。
　まず、図１及び図３に示すように、先行して打ち込まれている一方の鋼管杭１Ａの上端に設けられた内側継手１０Ａの係合凹部１４Ａ（１４）にそれぞれの係合凸部２４Ａ（２４）を係合させながら、４個の開口単位部材２１Ａと４個の標準単位部材２１Ｂを交互に並設し、図４に示すように、内側継手１０Ａの周囲に円筒状の外側継手２０を構成する。 The above-described joint mechanism is used as a connecting method for connecting the pair of steel pipe piles 1A and 1B.
First, as shown in FIG.1 and FIG.3, each engagement convex part 24A (14A (14) of the inner joint 10A provided in the upper end of one steel pipe pile 1A driven in advance is set to each engagement convex part 24A (14A). 24), the four opening unit members 21A and the four standard unit members 21B are alternately arranged side by side. As shown in FIG. 4, the cylindrical outer joint 20 is provided around the inner joint 10A. Constitute.

　次に、図５及び図６に示すように、鋼管杭１Ａに対して、他方の鋼管杭１Ｂを吊り下ろし、外側継手２０を構成する開口単位部材２１Ａ及び標準単位部材２１Ｂの係合凸部２４Ｂ（２４）を、内側継手１０Ｂの係合凹部１４Ｂ（１４）の係合させることで、一対の鋼管杭１Ａ，１Ｂの内側継手１０Ａ，１０Ｂが外側継手２０の内部の所定位置に配置される。 Next, as shown in FIGS. 5 and 6, the other steel pipe pile 1B is suspended from the steel pipe pile 1A, and the engaging convex portion 24B of the opening unit member 21A and the standard unit member 21B constituting the outer joint 20 By engaging (24) with the engaging recess 14B (14) of the inner joint 10B, the

inner joints

10A, 10B of the pair of steel pipe piles 1A, 1B are arranged at predetermined positions inside the outer joint 20.

　次に、図７から図９に示すように、開口単位部材２１Ａの開口部２２に分割キー部材３１を挿入する。開口部２２に挿入された分割キー部材３１は、前記キー溝の長手方向に沿ってスライドさせる。そして、開口部２２へ次の分割キー部材３１を挿入する。 Next, as shown in FIGS. 7 to 9, the split key member 31 is inserted into the opening 22 of the opening unit member 21A. The split key member 31 inserted into the opening 22 is slid along the longitudinal direction of the key groove. Then, the next split key member 31 is inserted into the opening 22.

　所定数の分割キー部材３１の挿入が終わると、図１０から図１２に示すように、開口部２２に挿入した閉鎖部材３２をボルト３３を用いて固定して、開口部２２を閉鎖する。 When the predetermined number of divided key members 31 have been inserted, as shown in FIGS. 10 to 12, the closing member 32 inserted into the opening 22 is fixed using a bolt 33 to close the opening 22.

以上のようにして、一対の鋼管杭１Ａ，１Ｂを、鋼管杭１の長手方向へ相対移動しないよう連結することができる。 As described above, the pair of steel pipe piles 1 A and 1 B can be connected so as not to move relative to the longitudinal direction of the steel pipe pile 1.

最後に、前記回転抑止キーを内側継手１０の基部１１の外周面に形成された座ぐり部と、前記座ぐり部と対向するように外側継手２０の外周面に形成された座ぐり部とで構成される回転抑止キー溝に跨設することによって、一対の鋼管杭１Ａ，１Ｂは、鋼管杭１の周方向へも相対移動しないよう連結される。 Finally, the rotation suppression key includes a counterbore portion formed on the outer peripheral surface of the base portion 11 of the inner joint 10 and a counterbore portion formed on the outer peripheral surface of the outer joint 20 so as to face the counterbore portion. A pair of steel pipe piles 1 A and 1 B are coupled so as not to move relative to each other in the circumferential direction of the steel pipe pile 1 by straddling the configured rotation suppression keyway.

　ところで、本発明による継手機構の外側継手２０を複数の単位部材２１で構成することによって、上述のように製造コストを低減することに加えて以下の利点もある。 By the way, by forming the outer joint 20 of the joint mechanism according to the present invention with the plurality of unit members 21, there are the following advantages in addition to reducing the manufacturing cost as described above.

　外側継手２０を構成する単位部材２１は、鋳鋼製の円筒状体を周方向に８等分に分割することによって形成される。
　この単位部材２１は、鋼管杭１の長手方向に沿った方向の高さが、内側継手１０Ａと内側継手１０Ｂとを当接させた状態において、内側継手１０Ａと内側継手１０Ｂとに跨って周設される基準距離を有する円筒状体や、前記基準距離より僅かに、例えば０．５ｍｍ程度長い距離を有する円筒状体や、１．０ｍｍ程度長い距離を有する円筒状体から形成してもよい。なお、前記基準距離を有する円筒状体から形成される単位部材２１が基準単位部材２１Ｃであり、前記基準距離より長い距離を有する円筒状体から形成される単位部材２１が延長単位部材２１Ｄである。なお、基準単位部材２１Ｃや延長単位部材２１Ｄは、開口部２２が備えられていれば開口単位部材２１Ａでもあり、開口部２２が備えられていなければ標準単位部材２１Ｂでもある。 The unit member 21 constituting the outer joint 20 is formed by dividing a cylindrical body made of cast steel into eight equal parts in the circumferential direction.
The unit member 21 has a height in a direction along the longitudinal direction of the steel pipe pile 1 in a state where the inner joint 10A and the inner joint 10B are brought into contact with each other, straddling the inner joint 10A and the inner joint 10B. It may be formed from a cylindrical body having a reference distance, a cylindrical body having a distance slightly longer than the reference distance by, for example, about 0.5 mm, or a cylindrical body having a distance longer by about 1.0 mm. The unit member 21 formed from a cylindrical body having the reference distance is a reference unit member 21C, and the unit member 21 formed from a cylindrical body having a distance longer than the reference distance is an extended unit member 21D. . The reference unit member 21C and the extension unit member 21D are also the opening unit member 21A if the opening 22 is provided, and are the standard unit member 21B if the opening 22 is not provided.

　延長単位部材２１Ｄの上下端部には、基準単位部材２１Ｃと同様に、単位部材２１を内側継手１０に周設したときに、内側継手１０の係合凹部１４Ａ，１４Ｂに係合するための係合凸部２４Ａ，２４Ｂが形成されている。延長単位部材２１Ｄの内周には、基準単位部材２１Ｃと同様に、二条の円環状の内向き周溝２３（２３Ａ，２３Ｂ）が形成されている。 At the upper and lower ends of the extension unit member 21D, as with the reference unit member 21C, when the unit member 21 is provided around the inner joint 10, it is engaged with the engagement recesses 14A and 14B of the inner joint 10. Joint

convex parts

24A and 24B are formed. Similar to the reference unit member 21C, two annular inward circumferential grooves 23 (23A, 23B) are formed on the inner periphery of the extension unit member 21D.

　基準単位部材２１Ｃの一対の内向き周溝２３（２３Ａ，２３Ｂ）間の距離は、内側継手１０Ａと内側継手１０Ｂとが当接したときの、一対の外向き周溝１３（１３Ａ，１３Ｂ）間の距離と同じ距離に設定され、
　延長単位部材２１Ｄの一対の内向き周溝２３（２３Ａ，２３Ｂ）間の距離は、内側継手１０Ａと内側継手１０Ｂとが離間したときの、一対の外向き周溝１３（１３Ａ，１３Ｂ）間と同じ距離に設定されている。
　延長単位部材２１Ｄの内向き周溝２３（２３Ａ，２３Ｂ）間の距離は、前記基準距離より０．５ｍｍや１．０ｍｍだけ広くなるように形成する。
　すなわち、延長単位部材２１Ｄは、内向き周溝２３（２３Ａ，２３Ｂ）間の距離が、基準単位部材２１Ｃの内向き周溝２３（２３Ａ，２３Ｂ）間の距離より長く構成されている。なお、前記０．５ｍｍ及び１．０ｍｍは例示であり、実際には鋼管杭１の直径や、寸法公差に基づいて適当な値が設定される。 The distance between the pair of inward circumferential grooves 23 (23A, 23B) of the reference unit member 21C is between the pair of outward circumferential grooves 13 (13A, 13B) when the inner joint 10A and the inner joint 10B are in contact with each other. Is set to the same distance as
The distance between the pair of inward circumferential grooves 23 (23A, 23B) of the extension unit member 21D is between the pair of outward circumferential grooves 13 (13A, 13B) when the inner joint 10A and the inner joint 10B are separated from each other. The same distance is set.
The distance between the inward circumferential grooves 23 (23A, 23B) of the extension unit member 21D is formed to be wider than the reference distance by 0.5 mm or 1.0 mm.
That is, the extension unit member 21D is configured such that the distance between the inward circumferential grooves 23 (23A, 23B) is longer than the distance between the inward circumferential grooves 23 (23A, 23B) of the reference unit member 21C. In addition, the said 0.5 mm and 1.0 mm are illustrations, and an appropriate value is actually set based on the diameter and dimensional tolerance of the steel pipe pile 1.

　基準単位部材２１Ｃから外側継手２０を構成すると、連結される鋼管杭１Ａの内側継手１０Ａと鋼管杭１Ｂの内側継手１０Ｂとの対向面どうしは当接する。
　一方、前記基準距離より０．５ｍｍ長い距離をもった延長単位部材２１Ｄで外側継手２０を構成すると、鋼管杭１Ａの内側継手１０Ａと鋼管杭１Ｂの内側継手１０Ｂとの対向面の間に０．５ｍｍの間隙が生じ、前記基準距離より１．０ｍｍ長い距離をもった延長単位部材２１Ｄで外側継手２０を構成すると、鋼管杭１Ａの内側継手１０Ａと鋼管杭１Ｂの内側継手１０Ｂとの対向面の間に１．０ｍｍの間隙が生じることとなる。 If the outer joint 20 is comprised from the reference | standard unit member 21C, the opposing surfaces of the inner joint 10A of the steel pipe pile 1A and the inner joint 10B of the steel pipe pile 1B which will be connected will contact | abut.
On the other hand, when the outer joint 20 is constituted by the extension unit member 21D having a distance 0.5 mm longer than the reference distance, the distance between the opposing surfaces of the inner joint 10A of the steel pipe pile 1A and the inner joint 10B of the steel pipe pile 1B is 0. When the outer joint 20 is formed by the extension unit member 21D having a distance of 1.0 mm longer than the reference distance with a gap of 5 mm, the opposing surface between the inner joint 10A of the steel pipe pile 1A and the inner joint 10B of the steel pipe pile 1B is formed. A gap of 1.0 mm is generated between them.

このような、鋼管杭１の長手方向の長さの異なる外側継手２０群を用意しておくと、例えば、図１３に示すように、先行して打ち込まれている鋼管杭１Ａの姿勢が鉛直方向に沿う姿勢から外れている場合に、その鋼管杭１Ａに鋼管杭１Ｂを連結する際に、基準単位部材２１Ｃと延長単位部材２１Ｄとを組み合わせて、例えば図中左側に基準単位部材２１Ｃを配設し、図中右側に延長単位部材２１Ｄを配設することによって、後続する鋼管杭１Ｂの姿勢を、鉛直方向に沿った姿勢に打ち込むことができる。鋼管杭１Ａ，１Ｂどうしを、鉛直な姿勢に近い姿勢となるように修正しながら連結できる。内向き周溝２３（２３Ａ，２３Ｂ）は、分割キー部材３１に対して若干余裕をもった幅に構成されているため、鋼管杭１Ａ，１Ｂどうしを傾けたときも、分割キー部材３１のキー溝の長手方向に沿ったスライドは阻害されない。 When the outer joint 20 group having different lengths in the longitudinal direction of the steel pipe pile 1 is prepared, for example, as shown in FIG. 13, the posture of the steel pipe pile 1 A driven in advance is in the vertical direction. When the steel pipe pile 1B is connected to the steel pipe pile 1A, the reference unit member 21C and the extension unit member 21D are combined, for example, the reference unit member 21C is arranged on the left side in the figure. And by arrange | positioning extension unit member 21D on the right side in a figure, the attitude | position of the subsequent steel pipe pile 1B can be driven into the attitude | position along a perpendicular direction. The steel pipe piles 1A and 1B can be connected while being corrected so as to have a posture close to a vertical posture. Since the inward circumferential groove 23 (23A, 23B) is configured to have a width with a slight margin with respect to the split key member 31, the key of the split key member 31 can be obtained even when the steel pipe piles 1A, 1B are tilted. Slides along the length of the groove are not disturbed.

上述の実施形態においては、外側継手２０の開口部２２は、開口単位部材２１Ａの中央に備えられていたが、開口部２２は例えば図１４に示すように、隣接する２個の単位部材２１に跨って形成されてもよい。また、図１５に示すように、開口単位部材２１Ａの中において上下の位置が異なるように形成されてもよい。図１５に示すように、開口部２２の形成位置を左右にずらすことによって、開口部２２が上下に並んで形成される場合にくらべて、開口単位部材２１Ａの剛性の低下を抑えることができる。 In the above-described embodiment, the opening 22 of the outer joint 20 is provided at the center of the opening unit member 21A. However, the opening 22 is formed in two adjacent unit members 21 as shown in FIG. It may be formed straddling. Moreover, as shown in FIG. 15, you may form so that an up-and-down position may differ in the opening unit member 21A. As illustrated in FIG. 15, by shifting the formation position of the opening 22 to the left and right, it is possible to suppress a decrease in the rigidity of the opening unit member 21 A compared to the case where the opening 22 is formed side by side.

　上述の実施形態においては、外側継手２０を構成する単位部材２１の分割面を平面に構成したが、図１６や図１７に示すように、隣接する単位部材２１の対向面どうしに互い係合する係合部を備えてもよい。係合凸部２４の係合凹部１４への係合のみならず、隣接する単位部材２１どうしが互いに係合することによって単位部材２１が外方へ脱落することが防止される。 In the above-described embodiment, the division surface of the unit member 21 constituting the outer joint 20 is configured as a plane, but as shown in FIGS. 16 and 17, the opposing surfaces of the adjacent unit members 21 are engaged with each other. You may provide an engaging part. In addition to engaging the engaging convex portion 24 with the engaging concave portion 14, the unit members 21 are prevented from falling off when the adjacent unit members 21 are engaged with each other.

　上述の実施形態においては、外側継手２０を、８等分に分割された単位部材２１から構成したが、外側継手２０は、図１８に示すように、鋳鋼製の円筒状体のまま構成してもよい。この場合、図１９に示すように、内側継手１０は係合凹部１４を備えなくてもよい。だだし、鋼管杭１Ａと鋼管杭１Ｂを連結する作業において、分割キー部材３１をキー溝に挿通するまでは、外側継手２０を内側継手１０の周囲に保持しておく機構及び作業が必要となる。 In the above-described embodiment, the outer joint 20 is configured by the unit member 21 divided into eight equal parts, but the outer joint 20 is configured as a cylindrical body made of cast steel as shown in FIG. Also good. In this case, as shown in FIG. 19, the inner joint 10 does not have to include the engagement recess 14. However, in the work of connecting the steel pipe pile 1A and the steel pipe pile 1B, a mechanism and work for holding the outer joint 20 around the inner joint 10 are required until the split key member 31 is inserted into the key groove. .

この点を解決するために、図２０に示すように、少なくとも鋼管杭１Ａの内側継手１０Ａに、外側継手２０を内側継手１０の周囲に保持するための係合段部１５を備えてもよい。 In order to solve this point, as shown in FIG. 20, at least the inner joint 10 A of the steel pipe pile 1 A may be provided with an engagement step portion 15 for holding the outer joint 20 around the inner joint 10.

　また、図２１に示すように、外側継手２０の外周面は、内側継手１０の基部１１の外周面と面一となるように形成していなくてもよい。 Further, as shown in FIG. 21, the outer peripheral surface of the outer joint 20 may not be formed so as to be flush with the outer peripheral surface of the base 11 of the inner joint 10.

　上述した実施形態では、内側継手１０及び外側継手２０は、鋳鋼製の円筒状体をそれぞれ所定形状に加工して得られる構成について説明した。しかし、しかし、このような実施形態に限定されない。例えば、図２２に示すように、内側継手及び外側継手２０をストレートシーム鋼管から形成してもよい。なお、管体２は、例えばスパイラル鋼管から形成することができる。 In the above-described embodiment, the inner joint 10 and the outer joint 20 have been described with respect to configurations obtained by processing a cylindrical body made of cast steel into a predetermined shape. However, it is not limited to such an embodiment. For example, as shown in FIG. 22, the inner joint and the outer joint 20 may be formed from a straight seam steel pipe. In addition, the pipe body 2 can be formed from a spiral steel pipe, for example.

　ストレートシーム鋼管は、平板状の鋼板を、巨大なロールやプレスを用いて円筒状に成形し、接合部３を内外面から溶接する板巻加工法を用いて製造される。板巻加工法は、シームレス鋼管を製造するリング鍛造などの工法にくらべて安価である。内側継手１０及び外側継手２０をストレートシーム鋼管から形成することによって、安価に内側継手１０及び外側継手２０が得られる。 The straight seam steel pipe is manufactured using a plate winding method in which a flat steel plate is formed into a cylindrical shape using a huge roll or press, and the joint 3 is welded from the inner and outer surfaces. The plate winding method is less expensive than methods such as ring forging that produce seamless steel pipes. By forming the inner joint 10 and the outer joint 20 from straight seam steel pipes, the inner joint 10 and the outer joint 20 can be obtained at low cost.

　しかし、ストレートシーム鋼管はその長手方向に沿って接合部３を有し、シームレス鋼管のように周方向に均質ではないため、周方向において同一の剛性が得られず、内圧やねじれに弱い。
　また、外側継手２０を構成する開口単位部材２１Ａ及び標準単位部材２１Ｂのうち、開口部２２が形成されている開口単位部材２１Ａは、開口部２２において材料が少ないため、開口単位部材２１Ａのうち開口部２２が形成されていない部分や、標準単位部材２１Ｂにくらべて剛性が低くなってしまう。
　そこで、接合部３は、標準単位部材２１Ｂに設けられる。
　開口部２２が形成されている周方向部分と接合部３とが、ストレートシーム鋼管の長手方向に沿って重ならないようにすることによって、外側継手２０において一部がその他の部分よりも剛性が低くなりすぎることを防止できる。 However, straight seam steel pipes have joints 3 along the longitudinal direction thereof, and are not homogeneous in the circumferential direction like seamless steel pipes, so the same rigidity cannot be obtained in the circumferential direction, and they are vulnerable to internal pressure and torsion.
In addition, among the opening unit member 21A and the standard unit member 21B constituting the outer joint 20, the opening unit member 21A in which the opening 22 is formed has a small amount of material in the opening 22, and thus the opening of the opening unit member 21A. Rigidity becomes low compared with the part in which the part 22 is not formed and the standard unit member 21B.
Therefore, the joint portion 3 is provided on the standard unit member 21B.
By preventing the circumferential portion where the opening 22 is formed and the joint portion 3 from overlapping each other along the longitudinal direction of the straight seam steel pipe, a portion of the outer joint 20 is less rigid than the other portions. It can be prevented from becoming too much.

また、外側継手２０は、開口単位部材２１Ａのうち開口部２２が形成されている周方向部分及び接合部３を有する標準単位部材２１Ｂが、内側継手１０Ａ及び内側継手１０Ｂに対して、内側継手１０Ａ及び内側継手１０Ｂのうち接合部３が配設されている位置ではない位置となるように、周設されることが好ましい。
　外側継手２０のうちの剛性が低い周方向部分と、内側継手１０Ａ及び内側継手１０Ｂのうちの剛性が低い周方向部分とが、ストレートシーム鋼管の長手方向に沿って重ならないようにすることによって、継手機構において一部がその他の部分よりも剛性が低くなりすぎることを防止できる。 Further, the outer joint 20 has a standard unit member 21B having a circumferential portion in which the opening 22 is formed and the joint portion 3 in the opening unit member 21A, and the inner joint 10A with respect to the inner joint 10A and the inner joint 10B. In addition, it is preferable that the inner joint 10 B is provided around the inner joint 10 B so that it is not at the position where the joint portion 3 is disposed.
By preventing the circumferential portion with low rigidity of the outer joint 20 and the circumferential portion with low rigidity of the inner joint 10A and the inner joint 10B from overlapping with each other along the longitudinal direction of the straight seam steel pipe, In the joint mechanism, it is possible to prevent a part from becoming too low in rigidity than the other part.

なお、内側継手１０Ａ及び内側継手１０Ｂは、それぞれの接合部３が、鋼管杭１の長手方向に沿って重ならないように連結されることが好ましい。 In addition, it is preferable that the inner joint 10 A and the inner joint 10 B are connected so that the respective joint portions 3 do not overlap along the longitudinal direction of the steel pipe pile 1.

　本発明による鋼管の継手機構は、構造物設置用の基礎杭の他、土留め用鋼管矢板，地滑り抑止杭，橋脚用柱などの鋼管を連結するために使用するものであってもよい。 The steel pipe joint mechanism according to the present invention may be used to connect steel pipes such as earth retaining steel pipe sheet piles, landslide deterrent piles, and pier columns in addition to foundation piles for structure installation.

　上述した実施形態は、いずれも本発明の一例であり、該記載により本発明が限定されるものではなく、各部の具体的構成は本発明の作用効果が奏される範囲において適宜変更設計可能である。 Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description. The specific configuration of each part can be changed and designed as appropriate within the range where the effects of the present invention are exhibited. is there.

１　　　鋼管杭（鋼管）
２　　　管体
１０　　内側継手
１１　　基部
１２　　内嵌部
１３　　外向き周溝
１４　　係合凹部
２０　　外側継手
２１　　単位部材
２１Ａ　開口単位部材
２１Ｂ　標準単位部材
２１Ｃ　基準単位部材
２１Ｄ　延長単位部材
２２　　開口部
２３　　内向き周溝
２４　　係合凸部
３０　　キー部材
３１　　分割キー部材
３２　　閉鎖部材
３３　　ボルト 1 Steel pipe pile (steel pipe)
2 Tube 10 Inner joint 11 Base 12 Inner fitting 13 Outward circumferential groove 14 Engaging recess 20 Outer joint 21 Unit member 21A Opening unit member 21B Standard unit member 21C Reference unit member 21D Extension unit member 22 Opening 23 Inward circumference Groove 24 Engaging convex portion 30 Key member 31 Split key member 32 Closing member 33 Bolt

Claims

　鋼管の継手機構であって、
　前記鋼管の一端に設けられた第一内側継手と、他端に設けられた第二内側継手と、
　一対の前記鋼管を連結するために、一方の前記鋼管の前記第一内側継手と他方の前記鋼管の前記第二内側継手とを隣接させた状態において、前記第一内側継手と前記第二内側継手とに跨って周設される外側継手と、
　前記第一内側継手と前記外側継手、及び、前記第二内側継手と前記外側継手と係合して前記一対の鋼管どうしが該鋼管の長手方向に相対移動することを防止するキー部材とを備え、
　前記第一内側継手及び前記第二内側継手のそれぞれの外周には外向き周溝が備えられ、
　前記外側継手の内周には、前記第一内側継手及び前記第二内側継手のそれぞれの外周に備えられた前記外向き周溝と対向する内向き周溝が備えられ、
　前記外側継手には、前記外側継手の外周面から、前記外向き周溝と前記内向き周溝とから構成されるキー溝に前記キー部材を挿通するための開口部が備えられている
ことを特徴とする継手機構。 A steel pipe joint mechanism,
A first inner joint provided at one end of the steel pipe, a second inner joint provided at the other end,
In order to connect a pair of the steel pipes, the first inner joint and the second inner joint in a state where the first inner joint of one of the steel pipes and the second inner joint of the other steel pipe are adjacent to each other. An outer joint that runs around
A key member that engages with the first inner joint and the outer joint, and the second inner joint and the outer joint to prevent the pair of steel pipes from moving relative to each other in the longitudinal direction of the steel pipe; ,
Outer circumferential grooves are provided on the outer circumferences of the first inner joint and the second inner joint,
The inner circumference of the outer joint is provided with an inward circumferential groove facing the outward circumferential groove provided on the outer circumference of each of the first inner joint and the second inner joint,
The outer joint is provided with an opening for inserting the key member from an outer peripheral surface of the outer joint into a key groove constituted by the outward circumferential groove and the inward circumferential groove. Characteristic joint mechanism.
　前記キー部材は、円環の一部を構成する複数の分割キー部材と、前記分割キー部材の機能を有するとともに前記開口部を閉鎖する機能を有する閉鎖部材とを備えていることを特徴とする請求項１に記載の継手機構。 The key member includes a plurality of split key members constituting a part of a ring, and a closing member having a function of the split key member and a function of closing the opening. The joint mechanism according to claim 1.
　前記外側継手は、前記第一内側継手及び前記第二内側継手の周囲に並設される複数の単位部材から構成されていることを特徴とする請求項２に記載の継手機構。 The joint mechanism according to claim 2, wherein the outer joint is composed of a plurality of unit members arranged in parallel around the first inner joint and the second inner joint.
　前記複数の単位部材は、前記開口部が備えられている開口単位部材と、前記開口部が備えられていない標準単位部材とを含んでいることを特徴とする請求項３に記載の継手機構。 4. The joint mechanism according to claim 3, wherein the plurality of unit members include an opening unit member provided with the opening and a standard unit member not provided with the opening.
　前記複数の単位部材は、
　前記第一内側継手と前記第二内側継手とを当接させた状態において、前記第一内側継手と前記第二内側継手とに跨って周設される基準単位部材と、
　前記第一内側継手と前記第二内側継手とを離間させた状態において、前記第一内側継手と前記第二内側継手とに跨って周設される延長単位部材とを含んでいることを特徴とする請求項３又は４に記載の継手機構。 The plurality of unit members are
In a state where the first inner joint and the second inner joint are brought into contact with each other, a reference unit member provided around the first inner joint and the second inner joint;
In the state where the first inner joint and the second inner joint are separated from each other, an extension unit member provided around the first inner joint and the second inner joint is included. The joint mechanism according to claim 3 or 4.
　前記第一内側継手及び前記第二内側継手は、それぞれ、基部と前記基部に延設された内嵌部を備え、
　前記基部の前記内嵌部に臨む端面には係合凹部が円環状に備えられ、
　前記内嵌部の外周に前記外向き周溝が円環状に備えられ、
　前記基準単位部材及び前記延長単位部材の上下端部には、前記基準単位部材及び前記延長単位部材を前記第一内側継手及び前記第二内側継手とに跨って周設したときに前記係合凹部に係合可能な一対の係合凸部が備えられ、
　前記基準単位部材及び前記延長単位部材の内周に一対の前記外向き周溝に対向する一対の前記内向き周溝が備えられ、
　前記基準単位部材の一対の前記内向き周溝間の距離は、前記第一内側継手と前記第二内側継手とが当接したときの、前記一対の外向き周溝間の距離と同じ距離に設定され、
　前記延長単位部材の一対の前記内向き周溝間の距離は、前記第一内側継手と前記第二内
側継手とが離間したときの、前記一対の外向き周溝間と同じ距離に設定されていることを特徴とする請求項５に記載の継手機構。 Each of the first inner joint and the second inner joint includes a base portion and an inner fitting portion extending to the base portion,
An engagement concave portion is provided in an annular shape on an end surface of the base portion facing the inner fitting portion,
The outward circumferential groove is provided in an annular shape on the outer periphery of the inner fitting portion,
The upper and lower end portions of the reference unit member and the extension unit member are provided with the engagement recess when the reference unit member and the extension unit member are provided so as to straddle the first inner joint and the second inner joint. A pair of engaging projections engageable with,
A pair of inward circumferential grooves facing the pair of outward circumferential grooves on the inner circumference of the reference unit member and the extension unit member;
The distance between the pair of inward circumferential grooves of the reference unit member is the same as the distance between the pair of outward circumferential grooves when the first inner joint and the second inner joint are in contact with each other. Set,
The distance between the pair of inward circumferential grooves of the extension unit member is set to the same distance as between the pair of outward circumferential grooves when the first inner joint and the second inner joint are separated from each other. The joint mechanism according to claim 5.
　少なくとも前記外側継手はストレートシーム鋼管から形成され、
　前記ストレートシーム鋼管が有する接合部は、前記外側継手のうち前記開口部とは重ならない位置に配設されていることを特徴とする請求項１から６のいずれか一項に記載の継手機構。 At least the outer joint is formed from a straight seam steel pipe;
The joint mechanism according to any one of claims 1 to 6, wherein the joint portion of the straight seam steel pipe is disposed at a position in the outer joint that does not overlap the opening.
　少なくとも前記外側継手はストレートシーム鋼管から形成され、
　前記ストレートシーム鋼管が有する接合部は、前記内側継手における前記閉鎖部材を固定する位置とは重ならない位置に配設されていることを特徴とする請求項１から６のいずれか一項に記載の継手機構。 At least the outer joint is formed from a straight seam steel pipe;
The joint part which the said straight seam steel pipe has is arrange | positioned in the position which does not overlap with the position which fixes the said closure member in the said inner joint, The Claim 1 characterized by the above-mentioned. Joint mechanism.
　少なくとも前記外側継手はストレートシーム鋼管から形成され、
　前記ストレートシーム鋼管が有する接合部は、回転抑止キー溝を構成する前記内側継手に形成された座ぐり部及び前記外側継手に形成された座ぐり部とは重ならない位置に配設されていることを特徴とする請求項１から６のいずれか一項に記載の継手機構。 At least the outer joint is formed from a straight seam steel pipe;
The joint part which the said straight seam steel pipe has is arrange | positioned in the position which does not overlap the counterbore part formed in the said inner joint and the counterbore part formed in the said outer joint which comprise a rotation suppression keyway. The joint mechanism according to any one of claims 1 to 6, wherein:
　請求項１から９のいずれか一項に記載の継手機構を用いて一対の鋼管を連結する連結方法であって、
　一方の鋼管の一端に設けられた第一内側継手に外側継手を周設するステップと、
　前記第一内側継手と他方の鋼管の他端に設けられた第二内側継手とを隣接させて、前記外側継手の内面に前記第二内側継手を挿入し、前記外側継手を前記第一内側継手と前記第二内側継手とに跨らせるステップと、
　前記外側継手に備えられた開口部を介して、前記第一内側継手と前記外側継手、及び、前記第二内側継手と前記外側継手と係合して前記一対の鋼管どうしが該鋼管の長手方向に相対移動することを防止するキー部材を、前記外側継手の外周面から、前記第一内側継手及び前記第二内側継手のそれぞれの外周に備えられた外向き周溝と、前記外向き周溝と対向するように前記外側継手の内周に備えられた内向き周溝とから構成されるキー溝に挿通し、前記キー溝に挿通した前記キー部材を、前記キー溝内で周方向にスライドさせ、前記キー溝のうち前記開口部に対応する箇所を除いて、前記キー溝内の所定位置に前記キー部材を配置するステップと、
　前記キー部材の機能を有するとともに前記開口部を閉鎖する機能を有する閉鎖部材を用いて前記開口部を閉鎖するステップと、を備えていることを特徴とする連結方法。 A connection method for connecting a pair of steel pipes using the joint mechanism according to any one of claims 1 to 9,
A step of surrounding an outer joint to a first inner joint provided at one end of one steel pipe;
The first inner joint and the second inner joint provided at the other end of the other steel pipe are adjacent to each other, the second inner joint is inserted into the inner surface of the outer joint, and the outer joint is connected to the first inner joint. And straddling the second inner joint,
Through the opening provided in the outer joint, the first inner joint and the outer joint, and the second inner joint and the outer joint are engaged with each other so that the pair of steel pipes are in the longitudinal direction of the steel pipe. A key member for preventing relative movement from the outer peripheral surface of the outer joint to the outer circumferential groove provided on the outer circumference of each of the first inner joint and the second inner joint, and the outer circumferential groove. The key member inserted through the key groove is slid in the circumferential direction in the key groove. The key member is inserted into the key groove formed on the inner periphery of the outer joint so as to face the inner groove. And placing the key member at a predetermined position in the key groove excluding a portion corresponding to the opening in the key groove;
And a step of closing the opening using a closing member having the function of the key member and the function of closing the opening.
　請求項５から９のいずれか一項に記載の継手機構を用いて一対の鋼管を連結する連結方法であって、
　一方の鋼管の一端に設けられた第一内側継手に外側継手を周設するステップと、
　前記第一内側継手と他方の鋼管の他端に設けられた第二内側継手とを隣接させて、前記外側継手の内面に前記第二内側継手を挿入し、前記外側継手を前記第一内側継手と前記第二内側継手とに跨らせるステップと、
　前記外側継手に備えられた開口部を介して、前記第一内側継手と前記外側継手、及び、前記第二内側継手と前記外側継手と係合して前記一対の鋼管どうしが該鋼管の長手方向に相対移動することを防止するキー部材を、前記外側継手の外周面から、前記第一内側継手及び前記第二内側継手のそれぞれの外周に備えられた外向き周溝と、前記外向き周溝と対向するように前記外側継手の内周に備えられた内向き周溝とから構成されるキー溝に挿通し、前記キー溝に挿通した前記キー部材を、前記キー溝内において周方向にスライドさせ、前記キー溝のうち前記開口部に対応する箇所を除いて、前記キー溝内の所定位置に前記キー部材を配置するステップと、
　前記キー部材の機能を有するとともに前記開口部を閉鎖する機能を有する閉鎖部材を用いて前記開口部を閉鎖するステップと、を備え、
　前記外側継手を周設するステップにおいて、
　前記第一内側継手と前記第二内側継手とに跨って周設される前記外側継手を、前記外側継手を構成する複数の単位部材のうち、一部の単位部材を前記基準単位部材から構成し、他部の単位部材を前記延長単位部材から構成することによって、前記一方の鋼管の軸心と、前記他方の鋼管の軸心とを傾けるステップを備えていることを特徴とする連結方法。 A connection method for connecting a pair of steel pipes using the joint mechanism according to any one of claims 5 to 9,
A step of surrounding an outer joint to a first inner joint provided at one end of one steel pipe;
The first inner joint and the second inner joint provided at the other end of the other steel pipe are adjacent to each other, the second inner joint is inserted into the inner surface of the outer joint, and the outer joint is connected to the first inner joint. And straddling the second inner joint,
Through the opening provided in the outer joint, the first inner joint and the outer joint, and the second inner joint and the outer joint are engaged with each other so that the pair of steel pipes are in the longitudinal direction of the steel pipe. A key member for preventing relative movement from the outer peripheral surface of the outer joint to the outer circumferential groove provided on the outer circumference of each of the first inner joint and the second inner joint, and the outer circumferential groove. The key member inserted through the key groove is slid in the circumferential direction in the key groove. The key member is inserted into the key groove formed on the inner periphery of the outer joint so as to face the inner groove. And placing the key member at a predetermined position in the key groove excluding a portion corresponding to the opening in the key groove;
Closing the opening using a closing member having the function of the key member and the function of closing the opening, and
In the step of surrounding the outer joint,
A part of the plurality of unit members constituting the outer joint is constituted by the reference unit member, the outer joint provided around the first inner joint and the second inner joint. A connecting method comprising the step of inclining the axis of the one steel pipe and the axis of the other steel pipe by constituting the other unit member from the extended unit member.