JP7732149B2 - Temporary connection method for steel pipe poles - Google Patents
Temporary connection method for steel pipe polesInfo
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- JP7732149B2 JP7732149B2 JP2023057611A JP2023057611A JP7732149B2 JP 7732149 B2 JP7732149 B2 JP 7732149B2 JP 2023057611 A JP2023057611 A JP 2023057611A JP 2023057611 A JP2023057611 A JP 2023057611A JP 7732149 B2 JP7732149 B2 JP 7732149B2
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Description
本発明は、下層側の鋼管柱の上に上層側の鋼管柱を建て入れた後、上下の鋼管柱の継手を溶接により本接続するに際し、上下の鋼管柱の相対位置を予め保持する、鋼管柱の仮接続方法に関する。 This invention relates to a method for temporarily connecting steel pipe columns, which maintains the relative positions of the upper and lower steel pipe columns before permanently connecting them by welding the joints between them after the upper steel pipe column is erected on top of the lower steel pipe column.
鉄骨造の構造物において、鋼管柱の全長が長い場合には、建設現場に搬入可能な部材寸法に制約があるため、鋼管柱の全長を複数の節に分け、各節ごとに鉄骨工場で製作し、建設現場で各節の鋼管柱の継手を溶接接合することが行われている。 In steel-framed structures, when the overall length of a steel pipe column is long, there are restrictions on the dimensions of the components that can be transported to the construction site, so the entire length of the steel pipe column is divided into multiple sections, and each section is fabricated at a steel frame factory, and the joints between the steel pipe columns at each section are welded together at the construction site.
ここで、角形鋼管や円形鋼管等からなる鋼管柱の継手を溶接接合するとき、上下の鋼管柱の芯がずれると、溶接欠陥を招いたり、溶接後に鋼管柱の芯ずれによる付加曲げが生じたりするおそれがある。このため、上下の鋼管柱の継手を溶接等により本接続する前に、上下の鋼管柱の芯を位置合わせし、この状態で上下の鋼管柱の相対位置を保持するように仮接続することが重要である。 When welding steel pipe column joints made of square steel pipes, circular steel pipes, etc., misalignment of the upper and lower steel pipe columns can result in weld defects or additional bending due to misalignment of the steel pipe columns after welding. For this reason, before permanently connecting the upper and lower steel pipe column joints by welding or other means, it is important to align the centers of the upper and lower steel pipe columns and then temporarily connect them in this state so that the relative positions of the upper and lower steel pipe columns are maintained.
図９～図１２に、従来の鋼管柱の仮接続方法を示す。図９および図１０はそれぞれ、下層側の鋼管柱７および上層側の鋼管柱８の側面図、水平断面図である。また、図１１および図１２はそれぞれ、下層側の鋼管柱７と上層側の鋼管柱８とが仮接続された状況を示す側面図、水平断面図である。 Figures 9 to 12 show a conventional method for temporarily connecting steel pipe poles. Figures 9 and 10 are a side view and a horizontal cross-sectional view, respectively, of a lower-level steel pipe pole 7 and an upper-level steel pipe pole 8. Figures 11 and 12 are a side view and a horizontal cross-sectional view, respectively, showing the lower-level steel pipe pole 7 and the upper-level steel pipe pole 8 temporarily connected.
図９～図１２に示すように、上下の鋼管柱７、８を仮接続するには、鋼管柱７、８を鉄骨工場で製作する際に、下層側の鋼管柱７の上端部および上層側の鋼管柱８の下端部の外周に、エレクションピース７１、８１と呼ばれる鋼板を溶接して立設しておくのが一般的である。建設現場では、下層側の鋼管柱７と上層側の鋼管柱８のエレクションピース７１、８１の位置を合わせるようにして、下層側の鋼管柱７の上に上層側の鋼管柱８を建て入れる。そして、上下の鋼管柱７、８のエレクションピース７１、８１に添え板９１を当ててボルト９２およびナット９３により摩擦接合し、上下の鋼管柱７、８を仮接続する。さらに、この状態で上下の鋼管柱７、８の継手を溶接して本接続する。本接続された後、鋼管柱７、８の外周に残るエレクションピース７１、８１は、ガス溶断などにより切除される。 As shown in Figures 9 to 12, to temporarily connect the upper and lower steel pipe columns 7, 8, steel plates called erection pieces 71, 81 are typically welded and installed on the outer periphery of the upper end of the lower steel pipe column 7 and the lower end of the upper steel pipe column 8 when the steel pipe columns 7, 8 are fabricated at a steel frame factory. At the construction site, the upper steel pipe column 8 is erected on top of the lower steel pipe column 7 so that the positions of the erection pieces 71, 81 of the lower and upper steel pipe columns 7, 8 are aligned. Then, splice plates 91 are attached to the erection pieces 71, 81 of the upper and lower steel pipe columns 7, 8 and friction-welded with bolts 92 and nuts 93, temporarily connecting the upper and lower steel pipe columns 7, 8. Furthermore, in this state, the joints of the upper and lower steel pipe columns 7, 8 are welded to complete the permanent connection. After the permanent connection is complete, the erection pieces 71, 81 remaining on the outer periphery of the steel pipe columns 7, 8 are cut off using gas cutting or other methods.
特許文献１では、下層側の鋼管柱の上端部および上層側の鋼管柱の下端部を、半割り円筒状の一対の治具で両側から挟んで押さえつけ、この治具をエレクションピースの根本部分にボルトで締め込むことにより、上下の鋼管柱を位置合わせしている。 In Patent Document 1, the upper end of the lower-level steel pipe column and the lower end of the upper-level steel pipe column are clamped and pressed from both sides by a pair of half-cylindrical jigs, and these jigs are then tightened with bolts to the base of the erection piece, thereby aligning the upper and lower steel pipe columns.
特許文献２では、下層側の鋼管柱の上端部および上層側の鋼管柱の下端部の外周に立設されたエレクションピースに建入れ治具を取り付け、建入れ治具の位置調整ボルトの螺入量を調整することにより、上下の鋼管柱を位置合わせしている。 In Patent Document 2, a plumbing jig is attached to erection pieces erected on the outer periphery of the upper end of the steel pipe column on the lower floor and the lower end of the steel pipe column on the upper floor, and the upper and lower steel pipe columns are aligned by adjusting the amount of threading of the plumbing jig's position adjustment bolts.
特許文献３では、下層側の鋼管柱の上端部および上層側の鋼管柱の下端部に、断面形状がＴ字のエレクションピースをボルト接合することで、エレクションピースを着脱自在にしている。また、エレクションピースを接合するために鋼管柱に設けられるボルト孔を千鳥配置にすることで、鋼管柱のボルト孔近傍の応力集中を抑制している。 In Patent Document 3, erection pieces with a T-shaped cross section are bolted to the upper end of the steel pipe column on the lower floor and the lower end of the steel pipe column on the upper floor, making the erection pieces detachable. Furthermore, by staggering the bolt holes provided in the steel pipe column to attach the erection pieces, stress concentration near the bolt holes in the steel pipe column is suppressed.
しかし、特許文献１および特許文献２に記載の技術では、鉄骨工場で鋼管柱を製作する際に別途エレクションピースを製作して鋼管柱の端部に溶接したり、建設現場で上下の鋼管柱が本接続された後に、鋼管柱からガス溶断等によりエレクションピースを切除したりする手間が生じることに変わりはない。 However, with the technologies described in Patent Documents 1 and 2, the erection pieces must be fabricated separately and welded to the ends of the steel pipe columns when they are fabricated at the steel frame factory, and the erection pieces must still be removed from the steel pipe columns by gas cutting or other means after the upper and lower steel pipe columns are fully connected at the construction site, which still requires time and effort.
また、特許文献３に記載の技術では、エレクションピースがボルト接合により鋼管柱に取り付けられるので、建設現場で上下の鋼管柱が本接続された後に、鋼管柱からエレクションピースを容易に取り外すことができる。しかし、エレクションピースをボルト接合するために鋼管柱に設けられるボルト孔の配置を千鳥状にしても、ボルト孔による断面欠損で鋼管柱の有効断面が小さくなることは避けられず、構造設計上不利である。 Furthermore, with the technology described in Patent Document 3, the erection piece is attached to the steel pipe column by bolting, so the erection piece can be easily removed from the steel pipe column after the upper and lower steel pipe columns are fully connected at the construction site. However, even if the bolt holes provided in the steel pipe column for bolting the erection piece are arranged in a staggered pattern, it is unavoidable that the effective cross section of the steel pipe column will be reduced due to cross-sectional loss caused by the bolt holes, which is disadvantageous from a structural design perspective.
本発明は、下層側の鋼管柱の上に上層側の鋼管柱を建て入れて本接続するに際して行われる、上下の鋼管柱の仮接続を、鋼管柱に断面欠損を生じることなく容易に実施でき、本接続された後の鋼管柱から切除すべき残存部分が少ない、鋼管柱の仮接続方法を提供することを目的とする。 The present invention aims to provide a method for temporarily connecting steel pipe poles that can easily perform temporary connections between upper and lower steel pipe poles when plumbing an upper steel pipe pole onto a lower steel pipe pole to make a permanent connection without causing cross-sectional defects in the steel pipe pole, and that leaves little remaining material to be cut from the steel pipe pole after the permanent connection is made.
上記課題を解決するため、本発明は以下の特徴を有する。 To solve the above problems, the present invention has the following features:
［１］ 第一の鋼管柱の上に第二の鋼管柱を建て入れた後本接続するに際し、前記第一の鋼管柱と前記第二の鋼管柱との相対位置を予め保持する、鋼管柱の仮接続方法であって、上端部の外周にねじ付きスタッドが設けられた前記第一の鋼管柱の上に、下端部の外周に前記第一の鋼管柱のねじ付きスタッドに対応する位置にねじ付きスタッドが設けられた前記第二の鋼管柱を建て入れ、前記第一の鋼管柱と前記第二の鋼管柱とを跨ぐように、前記第一の鋼管柱および前記第二の鋼管柱の側面に、前記第一の鋼管柱および前記第二の鋼管柱のねじ付きスタッドに対応する位置にボルト孔が設けられた接続材を配設し、前記ねじ付きスタッドにナットを螺入して、前記接続材と前記第一の鋼管柱と前記第二の鋼管柱とを摩擦接合する、鋼管柱の仮接続方法。 [1] A method for temporarily connecting steel pipe poles, in which the relative positions of the first and second steel pipe poles are maintained in advance when making a permanent connection after plumbing a second steel pipe pole onto a first steel pipe pole, the method comprising: plumbing a second steel pipe pole, the second steel pipe pole having a threaded stud on the outer periphery of its lower end, onto the first steel pipe pole having a threaded stud on the outer periphery of its upper end, in positions corresponding to the threaded stud on the first steel pipe pole; arranging connecting members, the first steel pipe pole and the second steel pipe pole having bolt holes in positions corresponding to the threaded studs on the side surfaces of the first and second steel pipe poles, so as to straddle the first and second steel pipe poles; and threading nuts onto the threaded studs to frictionally join the connecting members to the first and second steel pipe poles.
［２］ 前記摩擦接合のすべり耐力および前記接続材の降伏耐力が、前記第二の鋼管柱の重量よりも大きい、［１］に記載の鋼管柱の仮接続方法。 [2] The temporary connection method for steel pipe poles described in [1], in which the slip resistance of the friction joint and the yield strength of the connecting material are greater than the weight of the second steel pipe pole.
［３］ 前記接続材の断面形状が、長方形、Ｌ形またはＴ形である、［１］または［２］に記載の鋼管柱の仮接続方法。 [3] A method for temporarily connecting steel pipe columns according to [1] or [2], wherein the cross-sectional shape of the connecting member is rectangular, L-shaped, or T-shaped.
［４］ 前記第一の鋼管柱の上端部の外周、および前記第二の鋼管柱の下端部の外周に設けられる前記ねじ付きスタッドが、前記第一の鋼管柱および前記第二の鋼管柱の中心軸の周りに１８０°未満の間隔で３箇所以上の位置に設けられている、［１］から［３］のいずれかに記載の鋼管柱の仮接続方法。 [4] A method for temporarily connecting steel pipe poles according to any one of [1] to [3], wherein the threaded studs provided on the outer periphery of the upper end of the first steel pipe pole and the outer periphery of the lower end of the second steel pipe pole are provided at three or more positions spaced at intervals of less than 180° around the central axes of the first steel pipe pole and the second steel pipe pole.
［５］ 前記第一の鋼管柱および前記第二の鋼管柱の各々に、前記ねじ付きスタッドが予め取り付けられた状態で、前記第一の鋼管柱および前記第二の鋼管柱が建設現場に搬入される、［１］から［４］のいずれかに記載の鋼管柱の仮接続方法。 [5] A method for temporarily connecting steel pipe poles according to any one of [1] to [4], in which the first steel pipe pole and the second steel pipe pole are transported to a construction site with the threaded stud already attached to each of the first steel pipe pole and the second steel pipe pole.
本発明に係る鋼管柱の仮接続方法では、上端部の外周にねじ付きスタッドが設けられた第一の鋼管柱と、下端部の外周に第一の鋼管柱のねじ付きスタッドに対応する位置にねじ付きスタッドが設けられた第二の鋼管柱とを用いている。 The temporary connection method for steel pipe poles according to the present invention uses a first steel pipe pole with a threaded stud on the outer periphery of its upper end, and a second steel pipe pole with a threaded stud on the outer periphery of its lower end at a position corresponding to the threaded stud on the first steel pipe pole.
エレクションピースを用いる従来技術では、鉄骨工場で鋼管柱を製作する際に別途エレクションピースを所定形状に製作して鋼管柱の端部に溶接したり、建設現場で本接続された後の鋼管柱に残存するエレクションピースをガス溶断等により切除したりする手間が生じる。これに対し、本発明の鋼管柱の仮接続方法では、ねじ付きスタッドには既製品を用いることができるため、ねじ付きスタッド自体の加工手間はほとんど発生しない。また、本発明で用いられる第一の鋼管柱および第二の鋼管柱の外周にねじ付きスタッドを溶接する手間は、従来技術において鋼管柱の外周にエレクションピースを溶接する手間に比べて、非常に小さい。また、本発明の鋼管柱の仮接続方法では、本接続された後の第一の鋼管柱および第二の鋼管柱に残存するねじ付きスタッドを切除する手間も、従来技術において鋼管柱に残存するエレクションピースを切除する手間に比べ、非常に小さい。 In conventional technologies using erection pieces, the erection pieces must be separately manufactured to a specified shape and welded to the end of the steel pipe column when the steel pipe column is fabricated at a steel frame factory, or the erection pieces remaining on the steel pipe column after the permanent connection is made at the construction site must be removed using gas cutting or other methods, resulting in the time and effort required. In contrast, in the steel pipe column temporary connection method of the present invention, pre-made threaded studs can be used, so there is almost no time and effort required for processing the threaded studs themselves. Furthermore, the time and effort required for welding threaded studs to the outer periphery of the first and second steel pipe columns used in the present invention is significantly less than the time and effort required for welding erection pieces to the outer periphery of steel pipe columns in conventional technologies. Furthermore, in the steel pipe column temporary connection method of the present invention, the time and effort required for removing threaded studs remaining on the first and second steel pipe columns after the permanent connection is significantly less than the time and effort required for removing erection pieces remaining on the steel pipe columns in conventional technologies.
さらに、エレクションピースをボルト接合により鋼管柱に取り付ける従来技術では、エレクションピースを接合するために鋼管柱に設けられるボルト孔により鋼管柱に断面欠損が生じ、鋼管柱の有効断面が小さくなるため、構造設計上不利である。これに対し、本発明の鋼管柱の仮接続方法では、鋼管柱にボルト孔を設ける必要がないため、鋼管柱の有効断面が損なわれることなく、鋼管柱の耐力を有効に活用できる。 Furthermore, in conventional technology where erection pieces are attached to steel pipe columns using bolt connections, the bolt holes drilled into the steel pipe column to connect the erection pieces cause cross-sectional defects in the steel pipe column, reducing the effective cross-section of the steel pipe column, which is disadvantageous in terms of structural design. In contrast, the steel pipe column temporary connection method of the present invention does not require bolt holes to be drilled into the steel pipe column, so the effective cross-section of the steel pipe column is not compromised and the bearing strength of the steel pipe column can be effectively utilized.
以下、図面を参照して、本発明の鋼管柱の仮接続方法の実施形態について、詳細に説明する。 Below, an embodiment of the temporary connection method for steel pipe poles of the present invention will be described in detail with reference to the drawings.
図１および図２にそれぞれ、本発明の鋼管柱の仮接続方法の一実施形態における、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａならびに接続材３Ａの側面図、水平断面図を示す。また、図３および図４にそれぞれ、本実施形態において、第一の鋼管柱１Ａと第二の鋼管柱２Ａとが仮接続された状況の側面図、水平断面図を示す。 Figures 1 and 2 respectively show a side view and a horizontal cross-sectional view of a first steel pipe column 1A, a second steel pipe column 2A, and a connecting member 3A in one embodiment of the steel pipe column temporary connection method of the present invention. Furthermore, Figures 3 and 4 respectively show a side view and a horizontal cross-sectional view of the first steel pipe column 1A and the second steel pipe column 2A temporarily connected in this embodiment.
図１～図４に示すように、本実施形態の鋼管柱の仮接続方法は、第一の鋼管柱１Ａの上に第二の鋼管柱２Ａを建て入れた後、第一の鋼管柱１Ａと第二の鋼管柱２Ａとの継手を溶接して本接続するに際し、第一の鋼管柱１Ａと第二の鋼管柱２Ａとの相対位置を予め保持するものである。第一の鋼管柱１Ａと第二の鋼管柱２Ａとの相対位置を予め保持することにより、第一の鋼管柱１Ａと第二の鋼管柱２Ａとを本接続するための継手の溶接を安定して行うことができる。本実施形態では、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａが角形鋼管からなる場合について説明する。 As shown in Figures 1 to 4, the method for temporarily connecting steel pipe columns of this embodiment involves plumbing a second steel pipe column 2A onto a first steel pipe column 1A, and then welding the joint between the first steel pipe column 1A and the second steel pipe column 2A to establish a permanent connection, by preserving the relative positions of the first steel pipe column 1A and the second steel pipe column 2A. By preserving the relative positions of the first steel pipe column 1A and the second steel pipe column 2A, welding of the joint for permanently connecting the first steel pipe column 1A and the second steel pipe column 2A can be carried out stably. In this embodiment, a case will be described in which the first steel pipe column 1A and the second steel pipe column 2A are made of square steel pipes.
図１および図２に示すように、継手の下層側に位置することとなる第一の鋼管柱１Ａの上端部の外周には、複数本のねじ付きスタッド１１が所定間隔で溶接されて設けられている。同様に、継手の上層側に位置することとなる第二の鋼管柱２Ａの下端部の外周には、第一の鋼管柱１Ａのねじ付きスタッド１１に対応する位置に、複数本のねじ付きスタッド１１が所定間隔で溶接されて設けられている。 As shown in Figures 1 and 2, a plurality of threaded studs 11 are welded at predetermined intervals to the outer periphery of the upper end of the first steel pipe column 1A, which will be located on the lower layer of the joint. Similarly, a plurality of threaded studs 11 are welded at predetermined intervals to the outer periphery of the lower end of the second steel pipe column 2A, which will be located on the upper layer of the joint, at positions corresponding to the threaded studs 11 of the first steel pipe column 1A.
具体的には、第一の鋼管柱１Ａの上端部の外周、および第二の鋼管柱２Ａの下端部の外周に設けられるねじ付きスタッド１１、２１は、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａの４つの側面、すなわち中心軸の周りに９０°間隔で４箇所の位置の各々に、鋼管柱の材軸方向に沿って５本ずつ設けられている。 Specifically, the threaded studs 11, 21 provided on the outer periphery of the upper end of the first steel pipe column 1A and the outer periphery of the lower end of the second steel pipe column 2A are provided on the four sides of the first steel pipe column 1A and the second steel pipe column 2A, i.e., five studs each, at four positions spaced 90° apart around the central axis, along the material axis of the steel pipe column.
そして、図３および図４に示すように、第一の鋼管柱１Ａの上に第二の鋼管柱２Ａを建て入れ、第一の鋼管柱１Ａと第二の鋼管柱２Ａとを跨ぐように、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａの４つの側面の各々に、接続材３Ａを配設する。本実施形態では、接続材３Ａとして、扁平な長方形の断面形状を有する鋼板を用いている。 Then, as shown in Figures 3 and 4, a second steel pipe column 2A is plumbed onto the first steel pipe column 1A, and connecting members 3A are arranged on each of the four side surfaces of the first steel pipe column 1A and the second steel pipe column 2A so as to straddle the first steel pipe column 1A and the second steel pipe column 2A. In this embodiment, steel plates with a flat rectangular cross-sectional shape are used as the connecting members 3A.
図１に示すように、接続材３Ａには、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａのねじ付きスタッド１１、２１に対応する位置にボルト孔３１が設けられている。そして、接続材３Ａのボルト孔３１に、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａのねじ付きスタッド１１、２１を挿入し、ねじ付きスタッド１１、２１にナット４を螺入して、接続材３Ａと第一の鋼管柱１Ａと第二の鋼管柱２Ａとを摩擦接合する。 As shown in FIG. 1, the connecting member 3A has bolt holes 31 at positions corresponding to the threaded studs 11, 21 of the first steel pipe column 1A and the second steel pipe column 2A. The threaded studs 11, 21 of the first steel pipe column 1A and the second steel pipe column 2A are inserted into the bolt holes 31 of the connecting member 3A, and nuts 4 are screwed onto the threaded studs 11, 21 to frictionally join the connecting member 3A to the first steel pipe column 1A and the second steel pipe column 2A.
ねじ付きスタッド１１、２１を構成する鋼材や、接続材３Ａを構成する鋼材は、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａを構成する鋼材と同種のものを必ずしも用いなくてもよく、建方時に第一の鋼管柱１Ａと第二の鋼管柱２Ａとの継手に作用する力に応じて適宜選択すればよい。 The steel materials that make up the threaded studs 11, 21 and the connecting member 3A do not necessarily have to be the same type as the steel materials that make up the first steel pipe column 1A and the second steel pipe column 2A; they can be selected appropriately depending on the forces acting on the joint between the first steel pipe column 1A and the second steel pipe column 2A during erection.
ただし、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａのねじ付きスタッド１１、２１に接続材３Ａをナット４で締結することによる摩擦接合のすべり耐力および接続材３Ａの降伏耐力が、第二の鋼管柱２Ａの重量よりも大きくなるようにすることが好ましい。つまり、下記（１）式を満たすように、ねじ付きスタッド１１、２１の直径および配置ならびに材質、接続材３Ａの形状および材質等を設定することが好ましい。 However, it is preferable that the slip resistance of the friction joint formed by fastening the connecting member 3A to the threaded studs 11, 21 of the first steel pipe column 1A and the second steel pipe column 2A with nuts 4 and the yield strength of the connecting member 3A be greater than the weight of the second steel pipe column 2A. In other words, it is preferable to set the diameter, arrangement, and material of the threaded studs 11, 21, and the shape and material of the connecting member 3A, etc., so as to satisfy the following formula (1).
Ｎc≦ｍｉｎ（Ｐs1、Ｐs2、Ｐs3） …（１）
ただし、（１）式において、Ｎc（Ｎ）は、第二の鋼管柱２Ａの重量である。また、Ｐs1（Ｎ）は、第一の鋼管柱１Ａのねじ付きスタッド１１に４枚の接続材３Ａをナット４で締結することによる、第一の鋼管柱１Ａと接続材３Ａとの摩擦接合のすべり耐力の合計である。同様に、Ｐs2（Ｎ）は、第二の鋼管柱２Ａのねじ付きスタッド２１に４枚の接続材３Ａをナット４で締結することによる、第二の鋼管柱２Ａと接続材３Ａとの摩擦接合のすべり耐力の合計である。また、Ｐs3（Ｎ）は、接続材３Ａの降伏耐力である。
N c ≦min (P s1 , P s2 , P s3 )...(1)
In equation (1), Nc (N) is the weight of the second steel pipe column 2A. Furthermore, Ps1 (N) is the total slip resistance of the friction joint between the first steel pipe column 1A and the connecting members 3A, which is formed by fastening four connecting members 3A to the threaded stud 11 of the first steel pipe column 1A with nuts 4. Similarly, Ps2 (N) is the total slip resistance of the friction joint between the second steel pipe column 2A and the connecting members 3A, which is formed by fastening four connecting members 3A to the threaded stud 21 of the second steel pipe column 2A with nuts 4. Furthermore, Ps3 (N) is the yield strength of the connecting members 3A.
このようにすると、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａと接続材３Ａとの摩擦接合部分のすべりや、接続材３Ａの降伏が確実に防止されるので、第一の鋼管柱の上に建て入れられた第二の鋼管柱２Ａが傾斜することがない。よって、第一の鋼管柱１Ａと第二の鋼管柱２Ａとの相対位置が安定的に保持された状態で、第一の鋼管柱１Ａと第二の鋼管柱２Ａとを本接続するための継手の溶接を安定して行うことができる。 This reliably prevents slippage at the friction joints between the first steel pipe column 1A and the second steel pipe column 2A and the connecting member 3A, as well as yielding of the connecting member 3A, and prevents tilting of the second steel pipe column 2A placed on top of the first steel pipe column. Therefore, the relative positions of the first steel pipe column 1A and the second steel pipe column 2A are stably maintained, allowing stable welding of the joint for permanently connecting the first steel pipe column 1A and the second steel pipe column 2A.
第一の鋼管柱１Ａと第二の鋼管柱２Ａとを本接続するための継手の溶接は、まず、接続材３Ａにより覆われていない部分を行う。この時点では、接続材３Ａの幅に相当する部分が溶接されずに残ることになる。次いで、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａから接続材３Ａを取り外し、溶接されずに残っている部分を露出させて、この残りの部分を溶接する。 To permanently connect the first steel pipe column 1A and the second steel pipe column 2A, welding is first performed on the portion not covered by the connecting material 3A. At this point, a portion corresponding to the width of the connecting material 3A remains unwelded. Next, the connecting material 3A is removed from the first steel pipe column 1A and the second steel pipe column 2A, exposing the remaining unwelded portion, and this remaining portion is welded.
このように、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａから接続材３Ａを取り外す時点では、接続材３Ａにより覆われていなかった部分のみ溶接が完了しており、この部分的な溶接により第二の鋼管柱２Ａが保持されることになる。よって、接続材３Ａの幅は、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａから接続材３Ａを取り外す時点で、未だ溶接されずに残っている部分が過大とならず、第二の鋼管柱２Ａを安定的に保持可能となるようなサイズに限定することが好ましい。 In this way, when the connecting material 3A is removed from the first steel pipe column 1A and the second steel pipe column 2A, welding is completed only in the portions not covered by the connecting material 3A, and the second steel pipe column 2A is held in place by this partial welding. Therefore, it is preferable to limit the width of the connecting material 3A to a size that ensures that the portion that remains unwelded is not excessively large when the connecting material 3A is removed from the first steel pipe column 1A and the second steel pipe column 2A, and that the second steel pipe column 2A can be stably held in place.
また、上述のとおり、本実施形態では、第一の鋼管柱１Ａの上端部の外周、および第二の鋼管柱２Ａの下端部の外周に設けられるねじ付きスタッド１１、２１は、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａの中心軸の周りに９０°間隔で４箇所に設けられている。このように、本発明に係る鋼管柱の仮接続方法では、第一の鋼管柱１Ａの上端部の外周、および第二の鋼管柱２Ａの下端部の外周に設けられるねじ付きスタッド１１、２１は、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａの中心軸の周りに１８０°未満の間隔で３箇所以上の位置に設けられていることが好ましい。 Furthermore, as described above, in this embodiment, the threaded studs 11, 21 provided on the outer periphery of the upper end of the first steel pipe column 1A and the outer periphery of the lower end of the second steel pipe column 2A are provided at four locations at 90° intervals around the central axes of the first steel pipe column 1A and the second steel pipe column 2A. Thus, in the method for temporarily connecting steel pipe columns according to the present invention, the threaded studs 11, 21 provided on the outer periphery of the upper end of the first steel pipe column 1A and the outer periphery of the lower end of the second steel pipe column 2A are preferably provided at three or more locations at intervals of less than 180° around the central axes of the first steel pipe column 1A and the second steel pipe column 2A.
このようにすると、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａと接続材３Ａとが摩擦接合される位置が、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａの中心軸に対して片側に偏らない。よって、第一の鋼管柱１Ａと第二の鋼管柱２Ａとの相対位置が安定的に保持された状態で、第一の鋼管柱１Ａと第二の鋼管柱２Ａとを本接続するための継手の溶接を安定して行うことができる。 In this way, the positions at which the first steel pipe column 1A and the second steel pipe column 2A and the connecting member 3A are friction-welded do not shift to one side relative to the central axes of the first steel pipe column 1A and the second steel pipe column 2A. Therefore, welding of the joint for permanently connecting the first steel pipe column 1A and the second steel pipe column 2A can be performed stably while the relative positions of the first steel pipe column 1A and the second steel pipe column 2A are stably maintained.
第一の鋼管柱１Ａおよび第二の鋼管柱２Ａは、ねじ付きスタッド１１、２１が予め取り付けられた状態となるように鉄骨工場で製作した上で、建設現場に搬入されることが好ましい。 The first steel pipe column 1A and the second steel pipe column 2A are preferably fabricated at a steel frame factory so that the threaded studs 11, 21 are pre-installed, and then transported to the construction site.
図５および図６にそれぞれ、本発明の鋼管柱の仮接続方法の他の実施形態において、第一の鋼管柱１Ａと第二の鋼管柱２Ａとが仮接続された状況における、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａならびに接続材３Ｂの側面図、水平断面図を示す。 Figures 5 and 6 show a side view and a horizontal cross-sectional view, respectively, of a first steel pipe column 1A, a second steel pipe column 2A, and a connecting member 3B when the first steel pipe column 1A and the second steel pipe column 2A are temporarily connected in another embodiment of the steel pipe column temporary connection method of the present invention.
図５および図６に示すように、本実施形態では、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａは上記実施形態で説明したものと同様であるが、接続材３ＢとしてＬ形の断面形状を有する山形鋼を用いている点が相違している。 As shown in Figures 5 and 6, in this embodiment, the first steel pipe column 1A and the second steel pipe column 2A are similar to those described in the above embodiment, but differ in that angle irons with an L-shaped cross section are used as the connecting members 3B.
図５に示すように、接続材３Ｂは、材軸方向の中央部分において、その断面の一方の辺にスカラップ３２が設けられている。このようにすると、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａの側面に、接続材３Ｂを配設したとき、接続材３Ｂにより覆われる部分を最小限にでき、接続材３Ｂを取り外す時点で、未だ溶接されずに残っている部分を最小限にできるので好ましい。 As shown in Figure 5, the connecting member 3B has a scallop 32 on one side of its cross section in the central portion in the material axis direction. This is preferable because when the connecting member 3B is arranged on the side surface of the first steel pipe column 1A and the second steel pipe column 2A, the area covered by the connecting member 3B can be minimized, and the area remaining unwelded when the connecting member 3B is removed can be minimized.
図７および図８にそれぞれ、本発明の鋼管柱の仮接続方法のさらに他の実施形態において、第一の鋼管柱１Ｂと第二の鋼管柱２Ｂとが仮接続された状況における、第一の鋼管柱１Ｂおよび第二の鋼管柱２Ｂならびに接続材３Ｃの側面図、水平断面図を示す。 Figures 7 and 8 show a side view and a horizontal cross-sectional view, respectively, of a first steel pipe column 1B and a second steel pipe column 2B, as well as a connecting member 3C, in a state in which the first steel pipe column 1B and the second steel pipe column 2B are temporarily connected, in yet another embodiment of the steel pipe column temporary connection method of the present invention.
図７および図８に示すように、本実施形態では、第一の鋼管柱１Ｂおよび第二の鋼管柱２Ｂならびに接続材３Ｃのいずれも、上記実施形態で説明したものと異なる。具体的には、第一の鋼管柱１Ｂの上端部の外周、および第二の鋼管柱２Ｂの下端部の外周に設けられるねじ付きスタッド１１、２１は、第一の鋼管柱１Ｂおよび第二の鋼管柱２Ｂの４つの側面の各々に、鋼管柱の材軸方向に沿って２列、各列につき５本ずつ設けられている。 As shown in Figures 7 and 8, in this embodiment, the first steel pipe column 1B, the second steel pipe column 2B, and the connecting member 3C all differ from those described in the above embodiments. Specifically, the threaded studs 11, 21 provided on the outer periphery of the upper end of the first steel pipe column 1B and the outer periphery of the lower end of the second steel pipe column 2B are provided on each of the four side surfaces of the first steel pipe column 1B and the second steel pipe column 2B in two rows along the material axis direction of the steel pipe column, with five studs in each row.
また、接続材３ＣとしてＴ形の断面形状を有するＴ形鋼を用いている。接続材３Ｃには、第一の鋼管柱１Ａおよび第二の鋼管柱２Ａの２列のねじ付きスタッド１１、２１に対応する位置に、ボルト孔（図示せず）が２列設けられている。 In addition, a T-shaped steel beam with a T-shaped cross section is used as the connecting member 3C. The connecting member 3C has two rows of bolt holes (not shown) at positions corresponding to the two rows of threaded studs 11, 21 of the first steel pipe column 1A and the second steel pipe column 2A.
図７に示すように、接続材３Ｃは、上記実施形態の接続材３Ｂと同様に、材軸方向の中央部分において、そのフランジの両側にスカラップ３２が設けられている。このようにすると、第一の鋼管柱１Ｂおよび第二の鋼管柱２Ｂの側面に、接続材３Ｃを配設したとき、接続材３Ｃにより覆われる部分を最小限にでき、接続材３Ｃを取り外す時点で、未だ溶接されずに残っている部分を最小限にできるので好ましい。また、接続材３Ｂを用いる上記実施形態に比べて、第一の鋼管柱１Ｂと第二の鋼管柱２Ｂとの相対位置がさらに安定的に保持された状態で、第一の鋼管柱１Ｂと第二の鋼管柱２Ｂとを本接続するための継手の溶接を安定して行うことができる。 As shown in Figure 7, similar to the connecting member 3B in the above embodiment, the connecting member 3C has scallops 32 on both sides of its flange at the center in the material axis direction. This is preferable because, when the connecting member 3C is arranged on the side surfaces of the first steel pipe column 1B and the second steel pipe column 2B, the area covered by the connecting member 3C can be minimized, and the area remaining unwelded when the connecting member 3C is removed can be minimized. Furthermore, compared to the above embodiment using the connecting member 3B, the relative position of the first steel pipe column 1B and the second steel pipe column 2B is more stably maintained, allowing for stable welding of the joint for permanently connecting the first steel pipe column 1B and the second steel pipe column 2B.
上記各実施形態の鋼管柱の仮接続方法によれば、上端部の外周にねじ付きスタッド１１が設けられた第一の鋼管柱１Ａ、１Ｂと、下端部の外周に第一の鋼管柱１Ａ、１Ｂのねじ付きスタッド１１に対応する位置にねじ付きスタッド２１が設けられた第二の鋼管柱２Ａ、２Ｂとを用いている。 The temporary connection method for steel pipe poles in each of the above embodiments uses a first steel pipe pole 1A, 1B with a threaded stud 11 provided on the outer periphery of the upper end, and a second steel pipe pole 2A, 2B with a threaded stud 21 provided on the outer periphery of the lower end at a position corresponding to the threaded stud 11 of the first steel pipe pole 1A, 1B.
エレクションピースを用いる従来技術では、鉄骨工場で鋼管柱を製作する際に別途エレクションピースを所定形状に製作して鋼管柱の端部に溶接したり、建設現場で本接続された後の鋼管柱に残存するエレクションピースをガス溶断等により切除したりする手間が生じる。これに対し、上記各実施形態の鋼管柱の仮接続方法では、ねじ付きスタッド１１、２１には既製品を用いることができるため、ねじ付きスタッド１１、２１自体の加工手間はほとんど発生しない。また、上記各実施形態で用いられる第一の鋼管柱１Ａ、１Ｂおよび第二の鋼管柱２Ａ、２Ｂの外周にねじ付きスタッド１１、２１を溶接する手間は、従来技術において鋼管柱の外周にエレクションピースを溶接する手間に比べて、非常に小さい。また、上記各実施形態の鋼管柱の仮接続方法では、本接続された後の第一の鋼管柱１Ａ、１Ｂおよび第二の鋼管柱２Ａ、２Ｂに残存するねじ付きスタッド１１、２１を切除する手間も、従来技術において鋼管柱に残存するエレクションピースを切除する手間に比べ、非常に小さい。 In conventional technology using erection pieces, when steel pipe columns are fabricated at a steel frame factory, erection pieces must be separately fabricated to a predetermined shape and welded to the end of the steel pipe column, or the erection pieces remaining on the steel pipe column after the permanent connection is made at the construction site must be removed using gas cutting or other methods, resulting in the time and effort required. In contrast, in the temporary connection methods for steel pipe columns in the above embodiments, pre-made threaded studs 11, 21 can be used, so there is almost no time and effort required to process the threaded studs 11, 21 themselves. Furthermore, the time and effort required to weld threaded studs 11, 21 to the outer periphery of the first steel pipe columns 1A, 1B and second steel pipe columns 2A, 2B used in the above embodiments is significantly less than the time and effort required to weld erection pieces to the outer periphery of steel pipe columns in the prior art. Furthermore, with the temporary connection methods for steel pipe poles in each of the above embodiments, the effort required to remove the threaded studs 11, 21 remaining on the first steel pipe poles 1A, 1B and the second steel pipe poles 2A, 2B after the permanent connection is made is much less than the effort required to remove the erection pieces remaining on the steel pipe poles in conventional technology.
さらに、エレクションピースをボルト接合により鋼管柱に取り付ける従来技術では、エレクションピースを接合するために鋼管柱に設けられるボルト孔により鋼管柱に断面欠損が生じ、鋼管柱の有効断面が小さくなるため、構造設計上不利である。これに対し、上記各実施形態の鋼管柱の仮接続方法では、第一の鋼管柱１Ａ、１Ｂおよび第二の鋼管柱２Ａ、２Ｂにボルト孔を設ける必要がないため、鋼管柱の有効断面が損なわれることなく、鋼管柱の耐力を有効に活用できる。 Furthermore, in conventional techniques where erection pieces are attached to steel pipe columns using bolt fastening, the bolt holes drilled into the steel pipe column to attach the erection pieces cause cross-sectional defects in the steel pipe column, reducing the effective cross-section of the steel pipe column, which is disadvantageous in terms of structural design. In contrast, the steel pipe column temporary connection methods of the above embodiments do not require bolt holes to be drilled in the first steel pipe columns 1A, 1B and the second steel pipe columns 2A, 2B, so the effective cross-section of the steel pipe column is not compromised and the bearing strength of the steel pipe column can be effectively utilized.
上記実施形態では、第一の鋼管柱１Ａ、１Ｂおよび第二の鋼管柱２Ａ、２Ｂが角形鋼管から成る場合について説明したが、本発明の鋼管柱の仮接続方法は、第一の鋼管柱および第二の鋼管柱が円形鋼管や四面溶接角形鋼管柱等からなる場合にも適用できる。また、第一の鋼管柱および第二の鋼管柱にコンクリートを充填して、コンクリート充填鋼管柱としてもよい。 In the above embodiment, the first steel pipe columns 1A, 1B and the second steel pipe columns 2A, 2B are described as being made of square steel pipes. However, the steel pipe column temporary connection method of the present invention can also be applied to cases where the first steel pipe column and the second steel pipe column are made of circular steel pipes, four-sided welded square steel pipe columns, etc. Furthermore, the first steel pipe column and the second steel pipe column may be filled with concrete to form concrete-filled steel pipe columns.
１Ａ、１Ｂ 第一の鋼管柱
１１ ねじ付きスタッド
２Ａ、２Ｂ 第二の鋼管柱
２１ ねじ付きスタッド
３Ａ～３Ｃ 接続材
３１ ボルト孔
３２ スカラップ
４ ナット
７、８ 鋼管柱
７１、８１ エレクションピース
９１ 添え板
９２ ボルト
９３ ナット
1A, 1B First steel pipe pole 11 Threaded stud 2A, 2B Second steel pipe pole 21 Threaded stud 3A to 3C Connection material 31 Bolt hole 32 Scallop 4 Nut 7, 8 Steel pipe pole 71, 81 Erection piece 91 Splice plate 92 Bolt 93 Nut
Claims (5)
上端部の外周にねじ付きスタッドが設けられた前記第一の鋼管柱の上に、下端部の外周に前記第一の鋼管柱のねじ付きスタッドに対応する位置にねじ付きスタッドが設けられた前記第二の鋼管柱を建て入れ、
前記第一の鋼管柱と前記第二の鋼管柱とを跨ぐように、前記第一の鋼管柱および前記第二の鋼管柱の側面に、前記第一の鋼管柱および前記第二の鋼管柱のねじ付きスタッドに対応する位置にボルト孔が設けられた接続材を配設し、
前記ねじ付きスタッドにナットを螺入して、前記接続材と前記第一の鋼管柱と前記第二の鋼管柱とを摩擦接合する、鋼管柱の仮接続方法。 A method for temporarily connecting steel pipe poles, in which the relative positions of the first steel pipe pole and the second steel pipe pole are maintained in advance when a second steel pipe pole is plumbed onto a first steel pipe pole and then finally connected,
Plumbing the second steel pipe pole, which has threaded studs on the outer periphery of its lower end at positions corresponding to the threaded studs on the first steel pipe pole, onto the first steel pipe pole, which has threaded studs on the outer periphery of its upper end,
Connecting members having bolt holes at positions corresponding to the threaded studs of the first steel pipe column and the second steel pipe column are arranged on the side surfaces of the first steel pipe column and the second steel pipe column so as to straddle the first steel pipe column and the second steel pipe column,
A method for temporarily connecting steel pipe poles, comprising screwing a nut onto the threaded stud to frictionally join the connecting material, the first steel pipe pole, and the second steel pipe pole.
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