JP3016487U - Structural material - Google Patents

Abstract

(57)【要約】 【目的】 強度に劣るが、薄肉で曲げ加工しやすい金属
管の強度を改善し建築用構造材又は家具用構造材を構成
する。 【構成】 等径薄肉金属管１の全長又は先細り薄肉金属
管１０１の先細り端部から反対側端部近くに達する長さ
及び周方向に複数本の突条２，２０１を突設する。該突
条２は、前記金属管１の周方向に等間隔に配設すると共
に、径方向寸法を等寸法に構成する。複数本の突条２０
１は、先細り端部から反対側端部に近づくに従って、先
細り薄肉金属管１０１の円形原形を再現するため変形せ
しめる。 (57) [Summary] [Purpose] To construct a structural material for construction or furniture by improving the strength of a metal tube that is inferior in strength but is thin and easy to bend. [Structure] A plurality of ridges 2 and 201 are provided so as to extend over the entire length of the equal-diameter thin-walled metal tube 1 or the length from the tapered end of the tapered thin-walled metal tube 101 to the vicinity of the opposite end and the circumferential direction. The ridges 2 are arranged at equal intervals in the circumferential direction of the metal tube 1 and have equal radial dimensions. Plural ridges 20
1 is deformed in order to reproduce the circular original shape of the tapered thin metal tube 101 from the tapered end toward the opposite end.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、建築用の補強機能を有する構造材，家具用の補強機能を有する構造 材に関する。 The present invention relates to a structural material having a reinforcing function for construction and a structural material having a reinforcing function for furniture.

【０００２】[0002]

【従来技術と問題点】[Prior art and problems]

建築用の構造材（たとえば、二重床用支持脚を覆うカバー）は、厚肉の丈夫な 円形鋼管がそのまま使用されている。 そのため、省資源，省エネルギーに寄与しないばかりか、重くて工事に不便で あり、さらには高価で不経済であった。 他の建築用構造材（たとえば、建築物の天井裏，壁内に配管される電線管）は 、薄肉で加工しやすい金属管が使用されているが、強度に劣っていた。 家具用の構造材（たとえば、事務用回転椅子の支持脚カバー）は、厚肉の丈夫 な円形鋼管が使用されているため、重くて取扱いに不便であり、高価で不経済で あった。 For structural materials for construction (for example, covers for supporting legs for double floors), thick and sturdy circular steel pipes are used as they are. Therefore, it not only contributes to resource and energy conservation, but it is heavy and inconvenient for construction, and it is expensive and uneconomical. Other structural materials for construction (for example, conduits that are laid in the ceilings and walls of buildings) use metal tubes that are thin and easy to process, but have poor strength. Structural materials for furniture (for example, support leg covers for office swivel chairs) are heavy and inconvenient to handle, and expensive and uneconomical due to the use of thick, sturdy circular steel pipes.

【０００３】 本考案は、このような事情に着目してなしたもので、強度に劣るものの薄肉で 曲げ加工しやすい金属管（たとえば、前記電線管）の強度を向上せしめて、前記 二重床用支持脚，事務用回転椅子の支持脚，間仕切り用柱などを補強せしめ得る 新しい構造材を提供することを目的とし、このことによって、省資源，省エネル ギーに寄与することを目的とする。 本考案の他の目的は、軽くて取扱いに便利な構造材を廉価に提供することであ る。The present invention has been made in view of such circumstances, and improves the strength of a metal pipe (for example, the electric wire pipe) which is inferior in strength but is thin and easy to be bent, and thus the double floor The purpose of the present invention is to provide a new structural material that can reinforce support legs for offices, support legs for office swivel chairs, columns for partitioning, etc., thereby contributing to resource and energy conservation. Another object of the present invention is to provide a structural material which is light and convenient to handle at low cost.

【０００４】[0004]

【問題点解決のための手段】[Means for solving problems]

叙上の目的を達成するために本考案がなした手段は、全長が等径の薄肉金属管 の全長及び周方向に複数本の突条を突設したということであり、複数本の突条が 等径薄肉金属管の周方向に等間隔に配設されたということであり、複数本の突条 及び該突条間の複数本の凹条の断面形状がいずれもほぼＶ字形状に成形され、か つ該Ｖ字状断面形状の拡がった両端部が連続一体化して等径薄肉金属管の周方向 に膨らみ、該薄肉金属管の断面形状を形成しているということであり、先細り薄 肉金属管の先細り端部から反対側端部近くに達する長さ及び周方向に複数本の突 条を突設したということであり、先細り端部における複数本の突条が先細り金属 管の周方向に等間隔に配設されたということであり、複数本の突条及び該突条間 の複数本の凹条の断面形状がいずれもほぼＶ字状に成形され、かつ該Ｖ字状断面 形状の拡がった両端部が連続一体化して先細り薄肉金属管の周方向に膨らみ、該 薄肉金属管の先細り端部の断面形状を形成しているということであり、複数本の 突条及び凹条が先細り薄肉金属管の先細り端部から反対側端部に近づくに従って 先細り薄肉金属管の径方向寸法を次第に短寸にすると共に、複数本の突条が先細 り端部から反対側端部に近づくに従って先細り薄肉金属管の周方向寸法を次第に 長寸にするということであり、先細り薄肉金属管の先細り端部と反対側の端部が 原形のままであるということである。 In order to achieve the above-mentioned object, the means made by the present invention is that a plurality of ridges are provided in the entire length and circumferential direction of a thin-walled metal pipe having an equal length in the length direction. Are arranged at equal intervals in the circumferential direction of a thin-walled metal tube of equal diameter, and the cross-sectional shapes of the plurality of ridges and the plurality of recesses between the ridges are all substantially V-shaped. That is, the expanded both ends of the V-shaped cross-sectional shape are continuously integrated and bulge in the circumferential direction of the thin metal tube of equal diameter to form the cross-sectional shape of the thin metal tube. This means that a plurality of ridges were projected in the length and circumferential direction from the tapered end of the meat metal pipe to the vicinity of the opposite end, and the plurality of ridges at the tapered end are the circumference of the tapered metal pipe. It means that they are arranged at equal intervals in a direction, and a plurality of ridges and a plurality of concave ridges between the ridges. All of the cross-sectional shapes are formed in a substantially V-shape, and both ends of the V-shaped cross-section are continuously integrated and bulged in the circumferential direction of the tapered thin-walled metal pipe to form a cross-section of the tapered end of the thin-walled metal pipe. This means that a plurality of ridges and grooves are tapered and the radial dimension of the tapered thin-walled metal pipe is gradually reduced as the tapered thin-walled metal pipe approaches the opposite end. At the same time, as the multiple ridges approach the end on the opposite side from the tapered end, the circumferential dimension of the tapered thin-walled metal pipe is gradually lengthened, and the opposite side to the tapered end of the tapered thin-walled metal pipe. It means that the ends of the are still in their original shape.

【０００５】[0005]

【作 用】[Work]

複数本の突条によって等径薄肉金属管、先細り薄肉金属管の強度が改善される 。 どちらの金属管も薄肉であるから、軽量になる。 The strength of thin-walled metal pipes of equal diameter and tapered thin-walled metal pipes is improved by using multiple ridges. Both metal tubes are thin and therefore lightweight.

【０００６】[0006]

【実施例】【Example】

請求項１〜３を図１〜図３で説明する。 全長が等径の薄肉金属管１は、図２示の如く複数本の突条２の先端部を結ぶ仮 想円よりもかなり大径の仮想円を原形とする等径の薄肉金属管である。 上記の薄肉金属管１は、従来から電線管として建物の天井裏、壁内などに配管 使用されている薄肉で曲げ加工しやすい鋼管を用い、この周知の鋼管の強度を複 数本の突条２で向上せしめて、二重床の支持脚用中空構造材又は事務用回転椅子 の支持脚用中空構造材を構成する。 Claims 1 to 3 will be described with reference to FIGS. The thin-walled metal pipe 1 having the same length as the entire length is a thin-walled metal pipe having the same diameter as the original shape of a virtual circle having a diameter considerably larger than a virtual circle connecting the tips of a plurality of ridges 2 as shown in FIG. . The thin-walled metal pipe 1 is a thin-walled steel pipe that has been conventionally used as a conduit pipe in the roof of a building, inside a wall, etc. and is easily bendable. Improve in 2 to construct a hollow structural material for supporting legs of double floors or a supporting member for office swivel chairs.

【０００７】 複数本の突条２は、等径薄肉金属管１の全長に構成すると共に、該金属管の周 方向に等間隔に配設し、さらに該金属管の径方向に等寸法に構成する。 複数本の突条２は、図２示の如く断面形状及び端面形状のいずれもが略Ｖ字形 状に成形され、そのＶ字形状の拡がった両端部が、各突条２間の各凹条３の方を 向くように成形され、全ての突条２が同一断面形状かつ同一端面形状に構成され る。The plurality of ridges 2 are formed over the entire length of the equal-diameter thin-walled metal pipe 1, are arranged at equal intervals in the circumferential direction of the metal pipe, and are formed to have the same size in the radial direction of the metal pipe. To do. As shown in FIG. 2, the plurality of ridges 2 have a substantially V-shaped cross-sectional shape and end face shape, and the wide ends of the V-shaped ridge 2 are recessed between the ridges 2. 3 are formed so as to face each other, and all the ridges 2 have the same sectional shape and the same end face shape.

【０００８】 複数本の突条２間に成形される複数本の凹条３（突条２と同数の凹条３）は、 全突条２と略同一断面形状かつ略同一端面形状の略Ｖ字形状に成形され、そのＶ 字形状の拡がった両端部が、複数本の突条２を構成しているＶ字形状の拡がった 両端部に連続一体化された構造とされ、その連続一体化部位が等径薄肉金属管１ の周方向（相互に反対向の周方向）に膨らんだ断面形状と端面形状とに構成され 、全ての凹条３が同一断面形状及び同一端面形状に構成される。The plurality of recessed ridges 3 (the same number of recessed ridges 3 as the ridges 2) formed between the plurality of ridges 2 have a substantially V-shaped cross section and substantially the same end face shape as all the ridges 2. The V-shaped expanded both ends are continuously integrated with the V-shaped expanded both ends forming the plurality of ridges 2, and the continuous integration is achieved. The cross-sectional shape and the end surface shape of which the parts bulge in the circumferential direction (circumferential direction opposite to each other) of the equal-diameter thin-walled metal pipe 1 are configured, and all the recessed stripes 3 are configured to have the same cross-sectional shape and the same end surface shape. .

【０００９】 複数本の凹条３は、等径薄肉金属管１の全長に構成すると共に、該金属管の周 方向に等間隔に配設され、さらに該金属管の径方向に等寸法に構成する。 等径薄肉金属管１は、上述のように構成すれば、複数本の突条２によって補強 され、強度が改善される。The plurality of recessed lines 3 are formed over the entire length of the thin metal tube 1 having the same diameter, are arranged at equal intervals in the circumferential direction of the metal pipe, and are formed to have the same size in the radial direction of the metal pipe. To do. With the thin-walled metal tube 1 having the same diameter configured as described above, it is reinforced by the plurality of ridges 2 and the strength is improved.

【００１０】 次に請求項４〜８を図４〜図１２で説明する。 先細り薄肉金属管１０１は、前記電線管を先細り形状に加工すると共に、複数 本の突条２０１を構成して強度を改善し、二重床の支持脚用中空構造材又は事務 用回転椅子の支持脚用中空構造材として使用可能ならしめる。Next, claims 4 to 8 will be described with reference to FIGS. The tapered thin-walled metal tube 101 is formed by processing the above-mentioned electric wire tube into a tapered shape, and improves the strength by forming a plurality of ridges 201 to support a hollow structure material for supporting legs of a double floor or a rotary chair for office work. If it can be used as a hollow structural material for legs, it is recommended.

【００１１】 複数本の突条２０１は、先細り薄肉金属管１０１の先細り端部から（図４で上 端部から）反対側端部近く（図４で下端部近く）に達する長さ及び周方向に配設 すると共に、先細り金属管１０１の先細り端部においては、図５示の如く周方向 に等間隔に配設し、さらに該金属管の径方向に等寸法に構成する。 複数本の突条２０１は、図５，図７，図８等に示す如く先細り端部及び同端部 近くにおける断面形状及び端面形状のいずれもが略Ｖ字形状に成形され、そのＶ 字形状の拡がった両端部が、各突条２０１間の各凹条３０１の方を向くように成 形され、全ての突条２０１が同一断面形状かつ同一端面形状に構成される。The plurality of ridges 201 have a length and a circumferential direction which reach from the tapered end of the tapered thin-walled metal pipe 101 (from the upper end in FIG. 4) to the opposite end (near the lower end in FIG. 4). At the same time, the tapered metal pipes 101 are arranged at equal intervals in the circumferential direction at the tapered end portions of the tapered metal pipe 101, and are further arranged to have the same size in the radial direction of the metal pipe. As shown in FIG. 5, FIG. 7, FIG. 8, etc., the plurality of ridges 201 are formed such that both the cross-sectional shape and the end surface shape near the tapered end portion are substantially V-shaped, and the V-shaped The expanded both ends are formed so as to face the recesses 301 between the protrusions 201, and all the protrusions 201 have the same cross-sectional shape and the same end face shape.

【００１２】 複数本の突条２０１間に成形される複数本の凹条３０１（突条２０１と同数の 凹条３０１）は、図５，図７，図８等に示す如く先細り端部及び同端部近くにお ける断面形状及び端面形状を、同図等に示されている全突条２０１と略同一断面 形状かつ略同一端面形状の略Ｖ字形状に成形し、そのＶ字形状の拡がった両端部 が、複数本の突条２０１を構成しているＶ字形状の拡がった両端部に連続一体化 された構造とされ、その連続一体化部位が先細り薄肉金属管１０１の周方向（相 互に反対向の周方向）に膨らんだ断面形状と端面形状とに構成され、全ての凹条 ３０１が同一断面形状かつ同一端面形状に構成される。As shown in FIGS. 5, 7, and 8, etc., the plurality of recessed lines 301 (the same number of recessed lines 301 as the protrusions 201) formed between the plurality of protruding lines 201 are tapered end portions and the same. The cross-sectional shape and the end surface shape near the end are formed into a substantially V-shaped shape having substantially the same cross-sectional shape and substantially the same end surface shape as all the protrusions 201 shown in the same figure and the like, and the V-shaped shape is expanded. The both end portions are continuously integrated with the V-shaped expanded both end portions forming the plurality of protrusions 201, and the continuously integrated portions are tapered in the circumferential direction (phase). The cross-sectional shape and the end surface shape are bulged in the circumferential directions (opposite to each other), and all the concave stripes 301 are configured to have the same cross-sectional shape and the same end surface shape.

【００１３】 複数本の凹条３０１は、先細り薄肉金属管１０１の先細り端部から反対側端部 近くまで、複数本の突条２０１と略等長に構成し、かつ該金属管の周方向に等間 隔に配設し、さらに該金属管の径方向に等寸法に構成する。 かくして、先細り薄肉金属管１０１の先細り端部及び同端部近くの断面形状と 端面形状とを構成し、該金属管を複数本の突条２０１で補強し、強度を改善する 。The plurality of recessed lines 301 are configured to have substantially the same length as the plurality of projecting lines 201 from the tapered end of the tapered thin-walled metal pipe 101 to the end on the opposite side, and in the circumferential direction of the metal pipe. The metal pipes are arranged at equal intervals, and are formed to have the same size in the radial direction of the metal pipe. Thus, the tapered thin metal tube 101 has a tapered end portion, a cross-sectional shape near the end portion and an end surface shape, and the metal tube is reinforced by a plurality of ridges 201 to improve the strength.

【００１４】 複数本の突条２０１及び凹条３０１は、図９，図１０等に示す如く先細り薄肉 金属管１０１の先細り端部から反対側端部に近づくに従って該金属管の径方向寸 法を次第に短寸にするように成形され、この構成と同時に、複数本の突条２０１ が先細り薄肉金属管１０１の先細り端部から反対側端部に近づくに従って該金属 管の周方向寸法を次第に長寸にするように成形され、先細り薄肉金属管１０１の 先細り端部から反対側端部へ近づくに従って複数本の突条２０１及び凹条３０１ が漸次消滅する形状に構成され、先細り薄肉金属管１０１の反対側端部が原形の 円形をそのままとどめた形状に構成される。As shown in FIGS. 9 and 10, the plurality of protruding ridges 201 and the concave ridges 301 are formed in a radial direction of the tapered thin metal tube 101 from the tapered end toward the opposite end. Simultaneously with this structure, the plurality of ridges 201 are tapered so that the circumferential dimension of the thin metal tube 101 gradually increases as the plurality of ridges 201 approaches the opposite end. Is formed so that the plurality of projections 201 and recesses 301 gradually disappear as the tapered thin-walled metal pipe 101 approaches the opposite end from the tapered thin-walled metal pipe 101. The side edges are configured to retain the original circular shape.

【００１５】 このようにして先細り薄肉金属管１０１の先細り端部から反対側端部に至る断 面形状を構成する。 ところで、上述した等径薄肉金属管１及び先細り薄肉金属管１０１の材質は、 アルミニウム，鉄，ステンレススチール等の金属類が好適である。In this way, the tapered thin-walled metal pipe 101 has a cross-sectional shape from the tapered end portion to the opposite end portion. By the way, as the material of the equal-diameter thin-walled metal pipe 1 and the tapered thin-walled metal pipe 101, metals such as aluminum, iron, and stainless steel are suitable.

【００１６】 次に本考案製品の使用法を二重床の支持脚用中空構造材として使用する場合に ついて説明する。 台座４，４０１に立設固定された支持脚５，５０１に二重床用床パネル６，６ ０１を螺合する前に、本考案の中空構造材を支持脚５，５０１に貫嵌装せしめて 一端部（図３，図１２で下端部）を台座４，４０１に当接せしめ、ついで、支持 脚５，５０１用の貫通孔８が頂板部の中心に開穿された断面Ｕ字形キャップ７， ７０１を支持脚５，５０１に貫通せしめると共に、本考案中空構造材の他端部（ 図３，図１２で上端部）に嵌合せしめ、支持脚５，５０１を覆う。（図３，図１ ２参照。）Next, the method of using the product of the present invention will be described when it is used as a hollow structural material for a supporting leg of a double floor. Before screwing the floor panel for double floor 6,601 into the support legs 5,501 which are vertically fixed to the pedestal 4,401, the hollow structural member of the present invention is fitted in the support legs 5,501 in a manner of being fitted therethrough. One end (the lower end in FIGS. 3 and 12) is brought into contact with the pedestal 4,401, and then a through hole 8 for the supporting legs 5,501 is opened in the center of the top plate to form a U-shaped cap 7. , 701 is passed through the supporting legs 5, 501 and is fitted to the other end (the upper end in FIGS. 3 and 12) of the hollow structural member of the present invention to cover the supporting legs 5, 501. (See FIGS. 3 and 12)

【００１７】 本考案中空構造材で覆われる支持脚５，５０１は、二重床用床パネル６，６０ １を螺合する側の他端部（図３，図１２で上端部）から反対側の一端部に向って 周面に適宜長さの螺旋溝が刻設された棒部材で構成され、一端部が台座４，４０ １に固定されて立設される。 上記支持脚５，５０１は、本考案中空構造材で覆われると、図２，図３，図５ ，図１２等に示す如く、凹条３の内面全長又は先細り端部の凹条３０１の内面に 当接し、震動，揺動などで台座４，４０１との固定部が破壊されないように本考 案中空構造材によって補強される。The supporting leg 5,501 covered with the hollow structural member of the present invention is opposite to the other end (the upper end in FIGS. 3 and 12) on the side on which the floor panel for double floor 6,601 is screwed. It is constituted by a bar member having a spiral groove of an appropriate length engraved on the peripheral surface toward one end thereof, and one end thereof is fixedly erected on the pedestal 4, 401. When the supporting legs 5 and 501 are covered with the hollow structure material of the present invention, as shown in FIGS. 2, 3, 5 and 12, etc., the inner surface of the recessed line 3 or the inner surface of the recessed line 301 of the tapered end portion. It is reinforced by the proposed hollow structure material so that it does not break the fixed part with the pedestal 4,401 due to vibration and rocking.

【００１８】[0018]

【効 果】[Effect]

本考案は、叙上のように構成したから、等径薄肉金属管，先細り薄肉金属管な どの基材が複数本の突条によって補強され、強度が改善される。 従って、強度に劣るものの、薄肉で曲げ加工しやすい周知の金属管（建物の天 井裏，壁内に配設されている前記周知の電線管）を加工すれば、軽量で強度にす ぐれた構造材が廉価に得られると共に、上記電線管の用途を拡大しえる利点があ る。 Since the present invention is configured as described above, a base material such as a thin-walled metal tube of equal diameter and a thin-walled tapered metal tube is reinforced by a plurality of ridges, and the strength is improved. Therefore, it is light in weight and strong enough by processing a well-known metal pipe that is inferior in strength but is thin and easy to bend (the above-mentioned well-known conduit pipe that is placed inside the wall of the building's ceiling and inside the wall). There is an advantage that the structural material can be obtained at a low price and the use of the above conduit can be expanded.

【図面の簡単な説明】[Brief description of drawings]

【図１】 請求項１〜３に記載された構造材の正面図。1 is a front view of a structural material according to claims 1 to 3. FIG.

【図２】 図１の平面図。FIG. 2 is a plan view of FIG.

【図３】 使用状態の説明図。FIG. 3 is an explanatory view of a usage state.

【図４】 請求項４〜８に記載された構造材の正面図。FIG. 4 is a front view of the structural material according to claims 4 to 8.

【図５】 図４の平面図。5 is a plan view of FIG.

【図６】 図５のＥ矢符側面図。6 is a side view of the arrow E in FIG.

【図７】 図４の底面図。7 is a bottom view of FIG.

【図８】 図４のＡ−Ａ断面端面図。FIG. 8 is an end view taken along the line AA of FIG.

【図９】 図４のＢ−Ｂ断面端面図。9 is an end view taken along the line BB of FIG.

【図10】 図４のＣ−Ｃ断面端面図。10 is an end view taken along the line CC of FIG. 4.

【図11】 図４のＤ−Ｄ断面端面図。11 is an end view taken along the line DD of FIG.

【図12】 使用状態の説明図。FIG. 12 is an explanatory diagram of a usage state.

【符号の説明】[Explanation of symbols]

１…等径の薄肉金属管 １０１…先細り薄肉金属管 ２，２０１…突 条 ３，３０１…凹 条 1 ... Thin-walled metal pipe with equal diameter 101 ... Tapered thin-walled metal pipe 2, 201 ... Projection line 3, 301 ... Recessed line

Claims (8)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】 全長が等径の薄肉金属管の全長及び周方
向に複数本の突条を突設した構造材。1. A structural material in which a plurality of ridges are projected in the entire length and the circumferential direction of a thin-walled metal tube having the same overall length. 【請求項２】 複数本の突条が等径薄肉金属管の周方向
に等間隔に配設された請求項１記載の構造材。2. The structural material according to claim 1, wherein a plurality of ridges are arranged at equal intervals in the circumferential direction of the thin metal tube of equal diameter. 【請求項３】 複数本の突条及び該突条間の複数本の凹
条の断面形状がいずれもほぼＶ字形状に成形され、かつ
該Ｖ字状断面形状の拡がった両端部が連続一体化して等
径薄肉金属管の周方向に膨らみ、該薄肉金属管の断面形
状を形成している請求項１又は２記載の構造材。3. A plurality of ridges and a plurality of concave ridges between the ridges are substantially V-shaped in cross-section, and both ends of the V-shaped cross-section are continuously integrated. The structural material according to claim 1 or 2, wherein the structural material swells in the circumferential direction of the thin metal tube of equal diameter to form a cross-sectional shape of the thin metal tube. 【請求項４】 先細り薄肉金属管の先細り端部から反対
側端部近くに達する長さ及び周方向に複数本の突条を突
設した構造材。4. A structural material in which a plurality of ridges are provided so as to extend from the tapered end portion of the tapered thin-walled metal pipe to the vicinity of the opposite end portion and in the circumferential direction. 【請求項５】 先細り端部における複数本の突条が先細
り金属管の周方向に等間隔に配設された請求項４記載の
構造材。5. The structural material according to claim 4, wherein a plurality of ridges at the tapered end portion are arranged at equal intervals in the circumferential direction of the tapered metal pipe. 【請求項６】 複数本の突条及び該突条間の複数本の凹
条の断面形状がいずれもほぼＶ字状に成形され、かつ該
Ｖ字状断面形状の拡がった両端部が連続一体化して先細
り薄肉金属管の周方向に膨らみ、該薄肉金属管の先細り
端部の断面形状を形成している請求項４又は５記載の構
造材。6. A plurality of ridges and a plurality of concave ridges between the ridges are substantially V-shaped in cross-section, and both ends of the V-shaped cross-section are continuously integrated. The structural member according to claim 4 or 5, wherein the structural material swells in the circumferential direction of the tapered thin-walled metal pipe to form a cross-sectional shape of the tapered end portion of the thin-walled metal pipe. 【請求項７】 複数本の突条及び凹条が先細り薄肉金属
管の先細り端部から反対側端部に近づくに従って先細り
薄肉金属管の径方向寸法を次第に短寸にすると共に、複
数本の突条が先細り端部から反対側端部に近づくに従っ
て先細り薄肉金属管の周方向寸法を次第に長寸にする請
求項４又は５又は６記載の構造材。7. The radial dimension of the tapered thin-walled metal pipe is gradually shortened as the plurality of ridges and recesses approach from the tapered end of the tapered thin-walled metal pipe to the end on the opposite side, and the plurality of ridges are formed. 7. The structural material according to claim 4, 5 or 6, wherein the circumferential dimension of the tapered thin-walled metal pipe is gradually lengthened as the strip approaches the opposite end from the tapered end. 【請求項８】 先細り薄肉金属管の先細り端部と反対側
の端部が原形のままである請求項４又は５又は６又は７
記載の構造材。8. The tapered thin-walled metal tube, wherein the end opposite to the tapered end remains in its original shape.
Structural material described.