JP5382798B2 - Light channel steel with different web thickness and flange thickness. - Google Patents
Light channel steel with different web thickness and flange thickness. Download PDFInfo
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- JP5382798B2 JP5382798B2 JP2009286005A JP2009286005A JP5382798B2 JP 5382798 B2 JP5382798 B2 JP 5382798B2 JP 2009286005 A JP2009286005 A JP 2009286005A JP 2009286005 A JP2009286005 A JP 2009286005A JP 5382798 B2 JP5382798 B2 JP 5382798B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 116
- 239000010959 steel Substances 0.000 title claims description 116
- 239000000463 material Substances 0.000 claims description 30
- 238000009957 hemming Methods 0.000 claims description 24
- 238000005452 bending Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 12
- 238000013016 damping Methods 0.000 description 7
- 238000005304 joining Methods 0.000 description 7
- 238000007747 plating Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011120 plywood Substances 0.000 description 3
- 229910018134 Al-Mg Inorganic materials 0.000 description 2
- 229910018467 Al—Mg Inorganic materials 0.000 description 2
- 229910000576 Laminated steel Inorganic materials 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Description
本発明は、ウェブ部の板厚と比べてフランジ部の総板厚をヘミング折り加工により厚くして断面性能を向上させた軽溝形鋼に関する。 The present invention relates to a light channel steel in which the cross-sectional performance is improved by increasing the total thickness of the flange portion by hemming folding compared to the thickness of the web portion.
近年、住宅用建築物を構築する際の建材として、またトラックの幌を構築する部材として、金属製の枠材とパネル面材が使用されるようになっている。例えば特許文献１に記載されているように、鋼製住宅においては、板厚１ｍｍ程度の薄鋼板に曲げ加工を施して形作った溝形鋼を多数本使用して、これをたて枠材、よこ枠材として矩形に組み合わせながら、必要に応じてさらに面材を貼ることで建物の骨組みを構築することが行なわれる。 In recent years, metal frame materials and panel face materials have been used as building materials for building residential buildings and as members for building truck hoods. For example, as described in Patent Document 1, in a steel house, a large number of grooved steel formed by bending a thin steel plate having a thickness of about 1 mm is used, and this is used as a frame material. A frame of a building is constructed by attaching a face material as necessary while combining it into a rectangle as a horizontal frame material.
ところで、板厚の厚いＨ形鋼や溝形鋼を押出法や圧延法等で製造する場合、ウェブ部とフランジ部で板厚の異なる形鋼を製造することはある（例えば特許文献２参照）が、住宅用建築物に用いられるような板厚の比較的薄い軽溝形鋼は、通常、均一な板厚の薄鋼板に曲げ加工が施されて製造されている。したがって、製造された軽溝形鋼のウェブ部とフランジ部は同じ厚さになっている。
そして、用いる部位、態様によって所望の機械的特性が発揮されるように軽溝形鋼の板厚が決められている。
By the way, when manufacturing H-section steel and channel steel with thick plate thickness by an extrusion method, a rolling method, etc., shape steel with which plate thickness differs in a web part and a flange part may be manufactured (for example, refer to patent documents 2). However, a relatively thin light groove steel used for a residential building is usually manufactured by bending a thin steel plate having a uniform thickness. Accordingly, the web portion and the flange portion of the manufactured light groove steel have the same thickness.
And the plate | board thickness of light grooved steel is decided so that a desired mechanical characteristic may be exhibited by the site | part and aspect to be used.
例えば上記特許文献１で提案されているような薄鋼板を素材とした軽溝形鋼では、ウェブ部とフランジ部は同じ厚さになっている。そして、所望の機械的特性が発揮されるような板厚とされている。
通常、住宅用建築物等に用いられる軽溝形鋼にあっては、所望の機械的特性を得るためにそのフランジ部の板厚を基準に全体の板厚が決められている。そのため、ウェブ部の板厚が必要性能以上に厚くなり、全体の重量が重くなっている。しかも、断面二次モーメント又は断面係数等の断面性能から必ずしも効率的な断面形状とはなっていない。
For example, in a light groove steel made of a thin steel plate as proposed in Patent Document 1, the web portion and the flange portion have the same thickness. And it is set as plate | board thickness which exhibits a desired mechanical characteristic.
Usually, in light grooved steel used for residential buildings and the like, the overall plate thickness is determined based on the plate thickness of the flange portion in order to obtain desired mechanical characteristics. Therefore, the plate | board thickness of a web part becomes thicker than required performance, and the whole weight is heavy. In addition, an efficient cross-sectional shape is not always obtained from a cross-sectional performance such as a cross-sectional secondary moment or a section modulus.
本発明は、このような問題点を解消するために案出されたものであり、フランジ部の総板厚をウェブ部の板厚よりも厚くすることにより、同じ重量及び同じ外形寸法であっても断面二次モーメント等の大きい軽溝形鋼を簡便に得ることを目的とする。 The present invention has been devised in order to solve such a problem. By making the total thickness of the flange portion thicker than the thickness of the web portion, the same weight and the same outer dimensions can be obtained. Another object of the present invention is to easily obtain a light groove section steel having a large secondary moment of section and the like.
本発明のウェブ部の板厚とフランジ部の総板厚が異なる軽溝形鋼は、その目的を達成するため、ヘミング折り返し成形加工が施されることによりフランジ部が２重、３重あるいはそれ以上の重なりを持った断面形状とされているとともに、ヘミング折り返し部分の最外側鋼板に座掘り孔が形成されていることを特徴とする。
また、ヘミング折り返し部分に、他の板材が介在されていることも好ましい。この板材としては鋼板又はゴム材が好ましい。他の板材を介在させることにより、振動減衰性能が必要とされる部位への使用に効果が期待される。
In order to achieve the purpose of the light grooved steel of the present invention in which the thickness of the web portion and the total thickness of the flange portion are different, the flange portion is doubled, tripled or doubled by hemming folding forming. The cross-sectional shape has the above overlap, and a countersink hole is formed in the outermost steel plate of the hemming folded portion .
It is also preferable that another plate material is interposed in the hemming folded portion. The plate material is preferably a steel plate or a rubber material. By interposing another plate material, an effect is expected for use in a site where vibration damping performance is required.
さらに、ウェブ部及び／又はフランジ部に折り曲げ溝が形成されていることが好ましい。折り曲げ溝を形成することにより、軽溝形鋼全体の剛性の向上と最大耐力後の体力低下の緩和が期待できる。この折り曲げ溝は軽溝形鋼の長さ方向に平行になるように設けられたものであっても良いし、直角あるいは所定の角度をなすように設けられたものであっても良い。
なお、２重、３重あるいはそれ以上の重なりを持った断面形状とされるフランジ部は、両方であっても良いし、片方のみであっても良い。
Furthermore, it is preferable that a bending groove is formed in the web portion and / or the flange portion. By forming the bent groove, it can be expected that the rigidity of the entire light-grooved steel is improved and the decrease in physical strength after the maximum strength is reduced. The bent grooves may be provided so as to be parallel to the length direction of the light grooved steel, or may be provided so as to form a right angle or a predetermined angle.
Note that the flange portion having a cross-sectional shape having double, triple, or more overlaps may be both or only one.
上記のようなウェブ部の板厚とフランジ部の総板厚が異なる軽溝形鋼は、薄鋼板の両側部にヘミング折り返し成形加工を施した後、当該両側にヘミング折り返し部を有する鋼板に曲げ加工を施してウェブ部とフランジ部を構築することにより製造される。
ヘミング折り返し成形加工及び曲げ加工はプレス成形、ロール成形又はドロー成形等で行うことが好ましい。
また、ロール成形又はプレス成形又はドロー成形により予め鋼板に所要数の折り曲げ溝が形成された鋼板にヘミング折り返し成形加工及び曲げ加工を施すことが好ましい。端部にヘミング折り返し成形加工を施した鋼板に曲げ加工を施してウェブ部とフランジ部を構築した後、ウェブ部又はフランジ部にプレス成形により所要数の折り曲げ溝を形成しても良い。
Light grooved steels with different web thickness and flange thickness as described above are subjected to hemming folding on both sides of the thin steel plate and then bent into steel plates having hemming folding on both sides. Manufactured by processing and constructing a web portion and a flange portion.
The hemming folding forming process and the bending process are preferably performed by press forming, roll forming, draw forming or the like.
Further, it is preferable to perform hemming folding forming and bending on a steel plate in which a required number of bending grooves are previously formed on the steel plate by roll forming, press forming, or draw forming. After forming the web portion and the flange portion by bending the steel plate whose end portion has undergone hemming folding forming processing, a required number of bending grooves may be formed by press forming on the web portion or the flange portion.
本発明の軽溝形鋼は、ヘミング折り返し成形加工が施されることによりフランジ部が２重、３重あるいはそれ以上の重なりを持った、すなわちフランジ部がウェブ部の板厚の２倍、３倍あるいはそれ以上の厚さとなった断面形状を有している。
このため、フランジ部分のみ断面を厚くすることが可能であり、外形寸法が同じ軽溝形鋼に比べ、軽で断面二次モーメント等の断面性能の大きい軽溝形鋼を得ることができる。
In the light groove steel of the present invention, the flange portion has double, triple or more overlap by being subjected to hemming folding forming processing, that is, the flange portion is twice the thickness of the web portion. It has a cross-sectional shape that is twice or more thick.
For this reason, it is possible to thicken the cross section only in the flange portion, and it is possible to obtain a light groove shape steel that is light and has a large cross sectional performance such as a second moment of section as compared with the light groove shape steel having the same external dimensions.
本発明の軽溝形鋼の接合部位においてフランジ最外側鋼板に座掘りが施されると、例えば軽溝形鋼を組み合わせてドリルねじ接合した場合にねじの頭が鋼板表面に出ることはなく、その上への面材接着での障害が回避できる。
フランジ部が２枚、３枚あるいはそれ以上の枚数の鋼板で形作られているため、それ自身でも振動減衰性能が大きいが、ヘミング折り返し成形加工時にフランジ部を構成する鋼板の間に他の鋼板やゴム材を介在させることにより、さらに振動減衰性能を一段と大きくすることができる。
When the flange outermost steel plate is subjected to drilling at the joining site of the light groove steel of the present invention, for example, when the light groove shape steel is combined and drill screw joined, the head of the screw does not come out on the steel plate surface, Obstacles due to adhesion of the face material thereon can be avoided.
Since the flange part is formed of two, three or more steel plates, the vibration damping performance itself is great, but other steel plates or other steel plates are not used between the steel plates constituting the flange part during hemming folding forming. By interposing the rubber material, the vibration damping performance can be further increased.
軽溝形鋼では、フランジに平行で且つウェブの中央を通る中立軸に関する断面二次モーメントや断面係数等でその構造部材としての性能が評価されている。また、断面二次モーメントは同じであっても、断面積を小さくすることにより、鋼材を軽くすることができる。
そこで、本発明者は、同じ鋼帯又は鋼板を使用して剛性の高い軽溝形鋼を製造するには如何したらよいか鋭意検討を重ねた。その過程で、フランジ部の板厚を、ヘミング折り返し成形加工技術を用いることにより、ウェブ部の板厚の数倍とすることにより、所期の目的が簡便な手段で達成できることを見出した。
以下にその詳細を説明する。
In light-grooved steel, performance as a structural member is evaluated by a secondary moment, a section modulus, and the like regarding a neutral axis that is parallel to the flange and passes through the center of the web. Moreover, even if the cross-sectional secondary moment is the same, the steel material can be lightened by reducing the cross-sectional area.
Then, this inventor repeated earnest examination about what should be done in order to manufacture light-rigid shape steel with high rigidity using the same steel strip or steel plate. In the process, it has been found that the intended purpose can be achieved by simple means by setting the plate thickness of the flange portion to be several times the plate thickness of the web portion by using the hemming folding forming technique.
Details will be described below.
本発明の軽溝形鋼は、図１に示すような断面形状を有している。すなわち、軽溝形鋼を構成するフランジ部が、ヘミング折り返し成形加工が施されることにより２重、３重あるいはそれ以上の重なりを持った複数枚の、いわゆる積層鋼板からなっている。２重や３重になっている部位が部分的であっても構わない。
通常、住宅用建築物等に用いられる軽溝形鋼は、一枚の鋼板又は鋼帯の側部に曲げ加工が施されて形作られるが、本発明の軽溝形鋼は、一枚の鋼板又は鋼帯の側部にヘミング折り返し成形加工が施された後に曲げ加工が施されることにより、フランジ部が積層鋼板から構築された軽溝形鋼を得ることができる。
The light groove steel of the present invention has a cross-sectional shape as shown in FIG. That is, the flange portion constituting the light groove steel is made of a plurality of so-called laminated steel plates having a double, triple or more overlap by performing hemming folding forming. The site that is doubled or tripled may be partial.
Usually, a light groove section steel used for a residential building or the like is formed by bending a single steel plate or a side of a steel strip, but the light groove section steel of the present invention is a single steel sheet. Alternatively, a light channel steel in which a flange portion is constructed from a laminated steel plate can be obtained by performing a bending process after a hemming folding forming process is performed on the side portion of the steel strip.
本発明の軽溝形鋼は、鋼板が重なっていない通常の軽溝形鋼に比べ、フランジ部分のみの総板厚を厚くすることが可能であり、外寸法が同じ通常の軽溝形鋼に比べ、断面二次モーメントや断面係数等の断面性能を大きくする断面設計ができる。
フランジ部が２重のヘミング折り鋼板で構築された軽溝形鋼の場合、ウェブ部は半分の板厚であるため、ウェブ部１枚分の重量削減が可能となり、結果的に重量削減によりコストダウンが図れる。
Compared with the normal light groove shape steel with which the steel plates do not overlap, the light groove shape steel of the present invention can increase the total plate thickness of only the flange portion, and the normal light groove shape steel with the same outer dimensions. In comparison, it is possible to design a cross-section that increases the cross-sectional performance such as the cross-sectional secondary moment and section modulus.
In the case of light channel steel constructed with double hemming folded steel plates with flanges, the web part is half the plate thickness, so it is possible to reduce the weight of one web part, resulting in cost savings due to weight reduction. You can go down.
図１に示すように、ウェブ部又はフランジ部に折り曲げ溝が形成されていると、ウェブ幅又はフランジ幅全体での座屈変形を抑制する作用が発揮され、本発明軽溝形鋼の初期剛性の向上、最大耐力後の急激な耐力低下を軽減することができる。
このようなウェブ部又はフランジ部に設けられた折り曲げ溝は、一枚の鋼板又は鋼帯の側部に施すヘミング折り返し成形の前段階で、ロール成形又はプレス成形又はドロー成形により形成することが好ましい。一枚の鋼板又は鋼帯の側部にヘミング折り返し成形加工及び曲げ加工を施した後、ウェブ部又はフランジ部にロール成形、プレス成形又はドロー成形により形成しても良い。
As shown in FIG. 1, when the bending groove is formed in the web portion or the flange portion, the effect of suppressing the buckling deformation in the entire web width or the flange width is exhibited, and the initial rigidity of the light groove shape steel of the present invention. And a sudden decrease in the proof stress after the maximum proof stress can be reduced.
Such a bending groove provided in the web portion or the flange portion is preferably formed by roll forming, press forming, or draw forming before the hemming folding forming performed on the side portion of one steel plate or steel strip. . You may form by roll forming, press molding, or draw forming in a web part or a flange part, after giving a hemming folding forming process and a bending process to the side part of one steel plate or steel strip.
本発明軽溝形鋼の素材としては、単なる冷延鋼板でもよいが、耐食性に優れためっき鋼板を用いることが好ましい。単なる冷延鋼板やめっき鋼板にさらに塗装を施したものでもよい。
めっき鋼板としては、Ｚｎめっき、Ａｌめっき、Ｚｎ−Ａｌ合金めっき、あるいはＺｎ−Ａｌ−Ｍｇ合金めっきが施された鋼板が好ましい。特に、Ａｌ：４．０〜１０．０質量％、Ｍｇ：１．０〜４．０質量％を含み、残部がＺｎからなるもの、さらに微量のＴｉやＢを含むもの、あるいはさらにＳｉを含む高耐食性のＺｎ−Ａｌ−Ｍｇ系合金めっきが施された鋼板が好ましい。
As a material for the light groove steel of the present invention, a simple cold-rolled steel plate may be used, but a plated steel plate having excellent corrosion resistance is preferably used. A simple cold rolled steel sheet or plated steel sheet may be further coated.
As the plated steel plate, a steel plate to which Zn plating, Al plating, Zn—Al alloy plating, or Zn—Al—Mg alloy plating is applied is preferable. In particular, Al: 4.0 to 10.0% by mass, Mg: 1.0 to 4.0% by mass, the balance being made of Zn, further containing a trace amount of Ti or B, or further containing Si A steel plate on which highly corrosion-resistant Zn—Al—Mg alloy plating is applied is preferable.
次に、本発明軽溝形鋼の振動特性について説明する。
フランジ部分が２重、３重あるいはそれ以上に鋼板が重なり合っているために、本発明軽溝形鋼全体の振動は、フランジ部分のそれぞれの鋼板が個別に振動しあうことで、支配的な振動特性を持ち難くなり、またエネルギー吸収量が大きく、振動減衰も大きくなる。特に、図２に示すように、ヘミング折り曲げ加工を施した鋼板の間に、他の鋼板をもう一枚挟み込んだり、高減衰ゴムを挟み込んだりすると、振動減衰効果はより大きくなる。
振動減衰性能をより高めるために鋼板の間に他の鋼板やゴム板を固定する方法として、ボルト等で固定する方法もあるが、ヘミング折り曲げ加工法を採用することで、折り曲げられた鋼板の間に挟み込むことができ、加工費やコストの両面からのコストダウンが期待できる。
Next, the vibration characteristics of the light groove steel of the present invention will be described.
Since the steel plates overlap in double, triple or more in the flange portion, the vibration of the light grooved steel of the present invention is dominant because each steel plate in the flange portion vibrates individually. It becomes difficult to have the characteristics, the energy absorption amount is large, and the vibration damping is also large. In particular, as shown in FIG. 2, the vibration damping effect is further increased when another steel plate is sandwiched or a high damping rubber is sandwiched between the steel plates subjected to hemming bending.
There is a method of fixing other steel plates and rubber plates between steel plates in order to enhance vibration damping performance, but there is also a method of fixing with bolts etc., but by adopting the hemming bending method, between the folded steel plates The cost can be reduced in terms of both processing costs and costs.
続いて、本発明で提供される軽溝形鋼の使用態様及び使用上のメリットについて説明する。
例えば鋼製住宅においては、軽溝形鋼をたて枠材、よこ枠材として矩形に組みながら建物の骨組みを構築している。通常、たて枠材となる軽溝形鋼のフランジ間によこ枠材を挿入し、両者をドリルねじで接合したり、溶接接合したりしている。このため、ドリルねじ接合の場合、ドリルねじの頭部が薄鋼板表面より出ることになり、さらにその上に構造用合板等を重ねようとするときの障害となってしまう。また、溶接接合の場合であっても、フランジ表面に溶接部の肉盛部分が出る形態となって同様の障害となる。
Then, the use aspect and light use merit of the light groove shape steel provided by this invention are demonstrated.
For example, in a steel house, a framework of a building is constructed by assembling a light groove shape steel into a rectangle as a vertical frame material and a horizontal frame material. Usually, a weft frame material is inserted between flanges of light grooved steel, which is a vertical frame material, and both are joined with a drill screw or welded. For this reason, in the case of drill screw joining, the head portion of the drill screw comes out of the surface of the thin steel plate, and further becomes an obstacle when trying to stack a structural plywood or the like thereon. Further, even in the case of welding joining, a similar problem occurs because the welded portion is exposed on the flange surface.
そこで、図３に示すように、本発明で提供される軽溝形鋼を用いる場合、フランジ部を構成する複数枚の鋼板の内の最外側の薄鋼板に座掘り孔を形成しておくことにより、前記ドリルねじ頭部や溶接肉盛による面材接着の障害を抑制することができる。
すなわち、本発明で提供される軽溝形鋼同士のドリルねじ接合、あるいは本発明で提供される軽溝形鋼の内側に従来型の軽溝形鋼をドリルねじ接合する場合、フランジ最外側の薄鋼板に座掘り孔を施すことで、ドリルねじ接合で頭部をフランジ表面以下とすることができ、その上への面材接着での障害を無くすことができる。
Therefore, as shown in FIG. 3, when using the light channel steel provided in the present invention, a countersink hole is formed in the outermost thin steel plate among the plurality of steel plates constituting the flange portion. Therefore, it is possible to suppress the failure of the face material adhesion due to the drill screw head and the weld overlay.
That is, in the case of drill screw joining between light groove shaped steels provided in the present invention, or in the case where a conventional light groove shaped steel is drill screw joined inside the light groove shaped steel provided in the present invention, the outermost flange By providing a counterbored hole in a thin steel plate, the head can be made below the flange surface by drill screw joining, and obstacles to adhesion of the face material thereon can be eliminated.
なお、本発明で提供される軽溝形鋼をたて枠材、よこ枠材として矩形に組むに当たって、例えば、よこ枠材となる軽溝形鋼のフランジ間外寸法をたて枠材となる軽溝形鋼のフランジ間内寸法と同じにして、よこ枠材となる軽溝形鋼の端部をたて枠材となる軽溝形鋼のフランジ間に挿入しても良いが、この場合、よこ枠材とたて枠材との間に段差が生じて軽溝形鋼組み付け後に構造用合板等を重ねる際に障害を発生することになる。
そこで、上記のように組み付けるに当たっては、よこ枠材となる軽溝形鋼の端部に予め押圧加工を施してフランジ間外寸法を、加工前の内寸法と同じにしておくことが好ましい。軽溝形鋼のウェブ部は薄い一枚の鋼板からなっているので、押圧加工により容易にフランジ間寸法を小さくすることができる。
In addition, when assembling the light groove shape steel provided by the present invention into a rectangular shape as a vertical frame material and a horizontal frame material, for example, the outer dimension between the flanges of the light groove shape steel to be the horizontal frame material becomes a vertical frame material. You can insert the end of the light groove shape steel that will be the weft frame material between the flanges of the light groove shape steel that will be the vertical frame material in the same way as the inside dimension between the flanges of the light groove shape steel. A step is generated between the horizontal frame material and the vertical frame material, which causes an obstacle when the structural plywood and the like are stacked after the light groove steel is assembled.
Therefore, when assembling as described above, it is preferable to press the end portion of the light groove steel to be the weft frame material in advance so that the outer dimension between the flanges is the same as the inner dimension before processing. Since the web portion of the light groove shaped steel is made of a single thin steel plate, the dimension between the flanges can be easily reduced by pressing.
本発明で提供される軽溝形鋼同士を溶接接合する場合や、発明で提供される軽溝形鋼の内側に従来型の軽溝形鋼を溶接接合する場合も同様である。フランジ最外側の薄鋼板に栓溶接の厚さが埋まる深さと大きさの孔を空けることで、栓溶接部のフランジ表面からの出っぱりを無くすことが可能となり、本発明で提供される軽溝形鋼接合後に構造用合板等を重ねる際に障害を発生することなく接合することができる。 The same applies to the case where the light groove-shaped steels provided in the present invention are welded together or the case where a conventional light groove-shaped steel is welded to the inside of the light groove-shaped steel provided in the invention. Protruding from the flange surface of the plug welded portion can be eliminated by making a hole with a depth and size that fills the thickness of the plug weld in the outermost thin steel plate of the flange. Bonding can be performed without causing any obstacles when stacking structural plywood and the like after joining the groove steel.
さらに図４で示すように、本発明で提供される軽溝形鋼同士のかしめナット接合、あるいは本発明で提供される軽溝形鋼の内側に従来型の軽溝形鋼をかしめナット接合する場合、フランジ最外側の薄鋼板にかしめナットのボルト側の出の厚さが埋まる深さと大きさの孔を空けることで、かしめナット部のフランジ表面からの出っぱりを無くすことが可能となり、ヘミング折りでの鋼板を重ねる際に障害を無くすことができる。 Further, as shown in FIG. 4, caulking nut joining between the light groove shaped steels provided in the present invention, or a conventional light groove shaped steel is joined to the inner side of the light groove shaped steel provided in the present invention. In this case, it is possible to eliminate protrusions from the flange surface of the caulking nut part by opening a hole with a depth and size in which the thickness of the caulking nut on the bolt side is buried in the outermost thin steel plate of the flange. Obstacles can be eliminated when stacking steel plates in hemming folds.
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