JP2011106149A - Double-flange light-gauge steel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-gauge steel material, which has high cross-sectional performance, for use in a steel-frame structure of structures, low-rise buildings, etc. <P>SOLUTION: This double-flange light-gauge steel is characterized by: a light-gauge channel steel which has a width-direction portion of a long steel plate bent to have an approximately U-shaped cross section, and which composes a flange 1b having the steel plate doubled by turning back and bent a leading end of the approximately U-shaped cross-section flange 1a at an angle of 180 degrees and a web 2 whose central portion is formed of a single plate; and lip light-gauge H-shaped steel which has a width-direction portion of a long-side steel plate bent to have an approximately H-shaped cross section, while a leading end of a flange 11a having an inward lip 13, and which composes of the lip 13 of a double steel plate formed by turning back and bending the leading end of the flange 11a at an angle of 180 degrees, the flange 11a and a web 12a whose central portion is formed of a single plate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a lightweight steel material used for a steel structure of a building, a low-rise building, etc., and relates to the shape (double flange) of the lightweight steel material with an emphasis on cross-sectional performance.

Conventionally, lightweight steel formed by forming a long steel plate in the width direction has higher rigidity than a flat steel plate, and has a cross-sectional shape such as a hat type, a U type, a C type, a Z type, an L type, and a B type. Is common. In JP-A-2003-328432 and JP-A-2001-55807 (second publicly known example), an example in which lightweight steel is used for a frame structure of a steel structure of a low-rise building, for example, a column, a beam, and an outer wall panel. Is disclosed.

Further, as a method for producing a lightweight section steel, a production method emphasizing safety (when handling a lightweight section steel) is disclosed in JP-A-2002-273521 (third known example), and JP-A-2003-147900. In (fourth known example), a manufacturing method in which the cross-sectional performance is emphasized is disclosed.

JP 2003-328432 A JP 2001-55807 A JP 2002-273521 A JP 2003-147900 A

However, the cross-sectional performance of the light-weight steel generally used is not necessarily an efficient cross-sectional shape, and it is difficult to say that the cross-sectional performance is an efficient cross-sectional shape even in the disclosures related to the third and fourth known examples. First, since a general lightweight section steel is manufactured by bending a long steel plate in the width direction, the section of the lightweight section steel has a uniform thickness. For example, the web of lip groove steel, the flange, and the lip have the same thickness. For this reason, the cross-sectional performance such as the secondary moment and the cross-section coefficient is not necessarily an efficient cross-sectional shape as disclosed in JP-A-2003-147900, and the cross-sectional performance per weight is low at present.

Next, in the case of the third known example, the purpose is to manufacture a lightweight steel with high safety, and since the end of the flange portion has an R shape, the cross-sectional area decreases slightly but the cross-sectional performance is small but low. There is a problem in terms of strength.

Further, in the case of the fourth known example, in order to increase the cross-sectional secondary moment, it is a manufacturing method in which the plate thickness of the flange tip portion is pressed up to 1.5 times. Although it is not realistic to press in a single step, it is disclosed that the pressure is divided and repeatedly pressed with a relatively low pressing force, but there are difficulties in equipment cost, processing time (economic speed), etc. is there.

  As a result of studying to solve the above-mentioned problems, the present inventor has overlapped the steel plate of the flange portion and the lip portion that are effective for the secondary moment of section, that is, the flange portion and the lip portion that are the farthest from the neutral axis of the member. By doubling the cross-sectional area, it was possible to increase the cross-sectional secondary moment, thereby achieving a lightweight section steel with high cross-sectional performance. The gist is as follows.

(1) A flange formed by bending the width direction of a long steel plate into a substantially U-shaped cross-sectional shape, folded back 180 degrees from the front end of the flange having the substantially U-shaped cross-sectional shape, and a center portion of the web A double-flange lightweight shape steel characterized by a light groove shaped steel made of a single plate.

(2) A lip and flange in which the width direction of the long-side steel plate is bent into a substantially C-shaped cross-section, folded back 180 degrees from the lip end of the C-shaped cross-section, and the steel plate is doubled, and a single plate web A double-flange lightweight shape steel characterized by a lip groove shaped steel.

(3) A flange in which the width direction of the long steel plate is bent to have a substantially H-shaped cross-section, folded back 180 degrees from the front end of the flange having the substantially H-shaped cross-section, and a center portion of the web A double-flange lightweight section steel characterized by a light H-section steel composed of a single plate.

(4) The width direction of the long side steel plate is formed to be bent into a substantially H-shaped cross section, the tip of the flange has a lip inward, and the lip and flange of the double steel plate are bent 180 degrees from the lip tip And a double-flange lightweight section steel characterized by a lip light H-section steel whose center part is composed of a single plate.

(A) According to the double flange lightweight section steel according to the present invention, the steel sheet of the flange and the lip surface (location effective for the secondary moment of section) is doubled to double the sectional area and -Enlarging men. Therefore, even if the outer dimensions are the same, the cross-sectional shape is more efficient than the prior art, and high cross-sectional performance is obtained. Due to the directionality of the secondary moment of section, it is an optimal steel material as a beam member of a steel structure.

(B) According to the double flange lightweight section steel according to the present invention, the end portion along the longitudinal direction of the flange is not an angular section to which burr at the time of conventional cutting is attached, but an R shape of 180 degree bending. It is. Therefore, even if a hand or a part of the body touches the end, an accident that hurts the body is unlikely to occur.

It is sectional drawing which shows an example of the light groove-shaped steel of the double flange lightweight section steel concerning this invention. FIG. 3 is an explanatory diagram showing a manufacturing procedure (method) of Example 1. It is sectional drawing which shows an example of the lip groove steel of the double flange lightweight shape steel concerning this invention. It is sectional drawing which shows an example of the light H-section steel of the double flange lightweight section steel concerning this invention. FIG. 3 is an explanatory diagram 1 showing a manufacturing procedure (method) of Example 3. FIG. 3 is an explanatory diagram 2 showing a manufacturing procedure (method) of Example 3. FIG. 4 is an explanatory view 3 showing a manufacturing procedure (method) of Example 3. FIG. 4 is an explanatory view 4 showing a manufacturing procedure (method) of Example 3. It is sectional drawing which shows an example of the lip | light light H-section steel of the double flange lightweight section steel concerning this invention.

Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. 1 to 9. The material of the lightweight steel material is a metal material such as a hot dip galvanized steel plate, a hot 55% aluminum-zinc alloy plated steel plate, and preferably has a thickness of about 1.2 to 3.2 mm, but is particularly limited. is not. As a method for forming the lightweight shaped steel material, it can be formed by any one of a pultrusion method, a press method, a roll forming method and the like.
Example 1
FIG. 1 is a sectional view showing an example of a light groove steel of a double flange lightweight section steel according to the present invention. FIG. 1 is composed of an outer flange 1a, an inner flange 1b, an outer web 2a, and an inner web 2b. Yes. Hereinafter, it demonstrates along this.

As shown in FIG. 2, first, the both ends of the long side of the long steel plate are folded 180 degrees from the turning point C so that the outer flange 1a and the inner flange 1b are in contact with each other. As shown in FIG. 1, a U-shaped bending process is performed with a bending line A as a base point to produce a light grooved steel. The light grooved steel has a web size of about 100 to 300 mm, a flange size of about 50 to 90 mm, and a length of about 6 to 12 m.

(Example 2)
FIG. 3 is a sectional view showing an example of a lip groove steel of a double flange lightweight section steel according to the present invention. FIG. 3 is composed of an outer flange 1 a, an inner flange 1 b, a web 2, and a lip 3. Hereinafter, it demonstrates along this.

First, forming is performed from both ends of the long side of the long steel plate, but in the forming process described above in Example 1, it is bent into a U-shape, and as shown in FIG. The lip 3 is manufactured by forming a lip 3 at a right angle with respect to the fold line i to manufacture a lip groove steel. The lip groove steel has a web size of about 60 to 150 mm, a flange size of about 30 to 50 mm, a lip size of about 10 to 20 mm, and a length of about 6 to 12 m.

(Example 3)
FIG. 4 is a cross-sectional view showing an example of a light H-section of a double flange lightweight section steel according to the present invention. FIG. 4 shows an outer flange 11a, inner flanges 11b, 11C, a long web 12a, and a short web. It is comprised from the web 12b. Hereinafter, it demonstrates along this.

As shown in FIG. 5, the long side both ends of the long steel plate are first subjected to L-bending on the short web 12b at a right angle, and then, as shown in FIG. 6, about half the dimension of the outer flange 11a. Bending is performed 180 degrees from the turning point c so that the inner flange 11c overlaps. Then, as shown in FIG. 7, it is bent into a U shape at the folding line a between the outer flange 11a and the inner flange 11b. Perform molding. Further, as shown in FIG. 7 and FIG. 8, bending is performed at two base points of the fold line B at the same time to produce a light H-section steel. The light H-shaped steel has a web size of about 75 to 200 mm, a flange size of about 75 to 100 mm, and a length of about 6 to 12 m.

Example 4
9 is a cross-sectional view showing an example of a lip light H-section of a double flange lightweight section steel according to the present invention. FIG. 9 is an outer flange 11a, an inner flange is 11b, 11C, a web is a long web 12a, A short web 12b and a lip 13 are formed. Hereinafter, it demonstrates along this.

First, forming is performed from both ends of the long side of the long steel plate, but as shown in FIGS. 5 to 8, the forming process described in Example 3 is performed, and then FIG. 9 is performed. As shown, a lip 13 is produced by forming a lip 13 at a right angle with the fold line A as a base point to produce a lip light H-section steel. The size of the lip light H-section steel is about 75 to 200 mm in web size, about 75 to 100 mm in flange size, about 20 mm in lip size, and about 6 to 12 m in length.

In addition, when further rigidity is required by design, the contact between the outer web 2a and the inner web 2b shown in FIG. 1 or the long web 12a and the short web 12b shown in FIGS. 4 and 9 are welded, Rigidity can also be secured.

As described above, according to the double flange lightweight section steel according to the present invention, it is possible to obtain a lightweight section steel with high cross-sectional performance, and it is a lightweight section steel in consideration of safety during handling. In particular, the effect given to the steel-frame house prefabricated manufacturer is extremely large.

1a outer flange 1b inner flange 2 web 2a outer web 2b inner web 3 lip 11a outer flange 11b inner flange 11c inner flange 12a long web 12b short web 13 lip i fold line b fold line c fold

Claims (5)

The long steel plate is folded in the cross-sectional shape in a substantially U-shaped cross-section, and is bent 180 degrees from the flange end of the substantially U-shaped cross-sectional shape to double the steel plate, and the center portion of the web is a single plate. A double-flange lightweight shape steel characterized by a constructed light groove shape steel. The long side steel plate is formed of a lip and a flange formed by bending the width direction of the steel plate into a substantially C-shaped cross-section, folded back 180 degrees from the lip tip of the C-shaped cross-sectional shape, and a single plate web. Double flange lightweight shape steel featuring a lip groove shaped steel. The long steel plate is bent in the shape of a substantially H-shaped cross-section, the flange is folded 180 degrees from the front end of the flange having the substantially H-shaped cross-section, and the center of the web is a single plate. A double-flange lightweight section steel characterized by a light H-section steel. The long-side steel plate is bent in the shape of a substantially H-shaped cross section, the flange tip has a lip inward, and the lip and flange of the double steel plate are bent by 180 degrees from the lip tip, and the web Double-flange lightweight section steel characterized by a lip light H-section steel whose center is composed of a single plate. The double-flange lightweight section steel according to any one of (1) to (4) above, wherein the width direction of the long-side steel sheet is bent and the flange has a double-shaped flange.

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