JP4545227B1 - Rebound lightweight steel - Google Patents

Abstract

[PROBLEMS] To provide a lightweight steel material used for a steel structure of a building or a low-rise building, having an efficient cross-sectional performance, that is, a high cross-sectional performance per weight, and eliminating the need for rust-proof coating. To provide lightweight shape steel.
A flange in which a pre-plated long steel plate is bent along a longitudinal direction into a substantially U-shaped cross-section and folded back 180 degrees from the front end of the flange having the substantially U-shaped cross-section to double the steel plate. And the central portion of the web is formed of a single plate, the end sides of the inner web 2b and the outer web 2a formed at both ends of the long side of the steel plate are overlapped, and the webs are fixed to each other with a grommet joint 4 at a predetermined interval. Multi-layered lightweight section steel characterized by light grooved steel.
[Selection] Figure 6

Description

The present invention is a lightweight steel material used for structures, steel structures of low-rise buildings, etc., has an efficient cross-sectional performance, is bent without welding a plated steel plate, and is excellent in economic efficiency. It relates to lightweight steel.

Conventionally, lightweight steel formed by bending a long steel plate along the longitudinal direction shows higher rigidity than a flat steel plate, such as a hat type, a U type, a C type, a Z type, an L type, a B type, etc. The cross-sectional shape is general. Because it is lightweight and exhibits high strength, it is widely used as a structural material for low-rise buildings such as houses. For example, Japanese Patent Application Laid-Open No. 2003-328432 (first known example) discloses an example in which the frame is used for a frame, a column, a beam, and an outer wall panel of a steel structure of a low-rise building. Japanese Patent Laid-Open No. 2001-55807 (second publicly known example) discloses an example in which it is used as a frame material for a load-bearing wall panel of a steel house.

The shape of a conventional lip groove steel (commonly called C-shaped steel) is formed by bending a long steel plate along the longitudinal direction by a roll forming method having a shape schematically shown in FIG. 9 and lip 10.

In recent years, by changing the uniform thickness of the web and flange, the lightweight section steel with a light weight while maintaining the cross-sectional performance and outer dimensions, that is, the U-shaped formed by bending the steel strip in the width direction. , Having an L-shaped or Z-shaped cross section, by pressing both ends in the width direction of the steel strip or the section steel toward the center in the width direction, a region corresponding to a part or the entire area of the flange of the shape steel A method of manufacturing a lightweight lightweight steel with high rigidity is disclosed in Japanese Patent Application Laid-Open No. 2003-147900 (third known example) by increasing the thickness to be thicker than the thickness so that part or all of the flange is thicker than the web. Has been.

Further, in Japanese Patent Laid-Open No. 02-296952 (fourth known example), a grooved steel having a double flange and welding both ends of the long side of the steel plate and the corner of the web from the outside, that is, an opening. Has disclosed a method of manufacturing an opening by welding and fixing a tip forming a bent opening at a predetermined position to a connecting portion at the bending position.

Further, in Japanese Examined Patent Publication No. 62-015694 (fifth known example), the cross-sectional shape has a molded part such as a groove, a fold, and a front end bend in the lip part, the whole is a C-shaped similar shape, and in the longitudinal direction. There is disclosed a method of manufacturing a shaped product formed by a roll forming method from a strip material having a curvature in a direction in which the lip side is concave and the web side is convex.

JP 2003-328432 A JP 2001-55807 A JP 2003-147900 A Japanese Patent Laid-Open No. 02-296952 Japanese Patent Publication No.62-015694

The problem to be solved by the present invention is that high cross-sectional performance cannot be obtained with the cross-sectional shape of the conventional lightweight section steel, and an efficient cross-sectional shape is devised in the disclosure relating to the third and fourth known examples, , Anti-corrosion coating is required. In the fifth known example, it is difficult to say that the cross-sectional shape is efficient. In view of this, the present invention provides an economical lightweight section steel having an efficient cross-sectional shape and capable of omitting rust prevention coating.

First, since a conventional lightweight section steel is manufactured by bending a long steel sheet along the longitudinal direction, the cross section of the lightweight section steel has a uniform thickness. For example, the flange 8 of the lip groove steel shown in FIG. 8, the web 9, and the lip 10 have the same plate thickness. Therefore, the cross-sectional performance such as the secondary moment and the cross-section coefficient is not an efficient cross-sectional shape, and the cross-sectional performance per weight is low.

Next, in the case of the third 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, but the steel material (cold steel plate) Although it is not realistic to press in one step and it is disclosed that the pressure is divided and repeatedly pressed with a relatively low pressing force, there are problems with a large amount of equipment costs and processing time (production efficiency). In addition, a process such as rust prevention coating is required, resulting in high costs.

In the case of the fourth known example, the flange portion is doubled, and the manufacturing method is to weld both the long side edges of the steel plate and the corner of the web from the outside. If the material is a plated steel plate, the process of repairing the plating layer near the weld is required, and if the material is black skin (non-surface treatment), a process such as rust prevention coating is required, resulting in high costs.

In the case of the fifth known example, the lip portion is doubled, but its purpose is to prevent the bending of the member in the longitudinal direction. It's hard to say.

  As a result of studying to solve the above-mentioned problems, the present inventor is not a conventional idea of arranging steel plates of the same thickness over the entire area from a mechanical point of view, and it is reasonable to increase the thickness only at locations where stress is applied. Considering that by doubling the cross-sectional area by superimposing two sheets of the steel plate of the flange part and lip part that are the most distant from the neutral axis of the member, that is, the part that is effective for the secondary moment of the cross section, The cross-section secondary moment can be increased, thereby obtaining a light-weight shaped steel with high cross-sectional performance, and by using a pre-plated steel sheet, the painting process can be omitted, As a means for integrating the webs located, it was conceived that eyelet processing can be adopted and fixed to eliminate the need for antirust coating. The gist is as follows.

(1) A flange in which a pre-plated long steel plate is bent into a substantially U-shaped cross-section along the longitudinal direction, folded back 180 degrees from the flange end of the substantially U-shaped cross-sectional shape, and the steel plate is doubled The center portion of the web is constituted by a single plate, the end sides of the inner web and the outer web formed at both ends of the long side of the steel plate are overlapped, and the webs are fixed to each other by eyelet bonding at a predetermined interval. Multi-layer lightweight section steel characterized by a grooved steel.

(2) A lip formed by folding a pre-plated long steel plate along the longitudinal direction into a substantially C-shaped cross-sectional shape and bending the steel plate double by 180-degree bending from the lip end of the substantially C-shaped cross-sectional shape; The flange and the central part of the web are composed of a single plate, the end sides of the inner web and the outer web formed at both ends of the long side of the steel plate are overlapped, and the webs are fixed to each other by eyelet bonding at a predetermined interval. Multi-layer lightweight steel featuring lip groove steel.

(A) According to the multi-layered lightweight section steel according to the present invention, the flange and the lip surface of the portion effective for the secondary moment of section and the steel plate of a part of the web are doubled to double the sectional area, The secondary moment of the cross section is increased. Therefore, even if the outer dimensions are the same as conventional ones, the cross-sectional shape is more efficient than that of the prior art and high cross-sectional performance is obtained. That is, it is reasonable to increase the thickness of only the portion where stress is applied, rather than disposing steel plates of the same thickness over the entire area from a mechanical standpoint, and it is economical because a high cross-sectional performance is obtained compared to the weight. In view of the direction of the secondary moment of the cross section, it is particularly effective when used for a steel-structured beam member or a frame material of an outer wall panel.

(B) According to the multi-layered lightweight section steel according to the present invention, a plurality of webs formed by bending using a pre-plated steel sheet are not processed by the conventional technique, but by the technique of the present invention. The web is integrated by a simple means of fixing with. Therefore, the rust preventive coating can be omitted and it can be manufactured at a low cost.

It is explanatory drawing which shows the hole position of the plating long steel plate (flat plate shape) concerning this invention. It is AA sectional drawing of FIG. It is explanatory drawing which shows the process sequence of a plating long steel plate. It is a schematic diagram which shows the example at the time of the processing shape of light grooved steel. It is explanatory drawing which shows an eyelet processing procedure (method), (a) Cross-sectional view and plan view before processing, (b) Cross-sectional view at the time of burring processing, (c) Cross-sectional view at the time of eyelet processing. It is sectional drawing which shows an example of the light groove shaped steel of the multilayer light weight shaped steel concerning this invention. It is sectional drawing which shows an example of the lip groove shape steel of the multilayer light weight shaped steel concerning this invention. It is sectional drawing which shows an example of the lip groove steel concerning a prior art.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. In addition, as a material of the light-weight shaped steel material, a metal material such as a hot dip galvanized steel plate and a hot 55% aluminum-zinc alloy plated steel plate is desirable, and a thickness of about 0.8 to 1.6 mm is desirable, but is not particularly limited. Absent. Although there is no particular limitation on the machine to be manufactured, for example, as a method of forming a lightweight shaped steel material, it can be formed by any one of a pultrusion method, a press method, a roll forming method, Eyelet processing can be performed by a press machine or by a complex machine facility combining each machine.

Example 1
FIG. 6 is a cross-sectional view showing an example of a light grooved steel of a multilayer lightweight section steel according to the present invention. In this example, an outer flange 1a, an inner flange 1b, an outer web 2a, an inner web 2b, an eyelet joint 4, And a fold line a. Hereinafter, it demonstrates along this.

FIG. 1 is an explanatory view showing a hole position of a long plated steel plate (flat plate), and FIG. 2 is a cross-sectional view showing a hole position in the width direction of the steel plate. First, as shown in FIGS. 1 and 2, a circular hole <2> having a diameter of about 6 to 12 mm and a plated long steel plate at predetermined positions of the inner web 2b at both ends of the long side of the plated long steel plate. Processing hole <1> having a cut (refer to a partially enlarged view) radially extending from a circular hole having a diameter of about 2 to 4 mm radially from a circular hole having a diameter of about 3 to 10 mm at a predetermined position corresponding to the end of the outer web 2a A plurality of the circular holes <2> and the processed holes <1> having cuts are formed at predetermined intervals along the longitudinal direction.

Next, as shown in FIG. 3, the outer flange 1a and the inner flange 1b are combined so that the hole center of the cut hole <1> and the hole hole of the circular hole <2> are aligned, and the turning point B is the base point. Then, bending is performed 180 degrees, and then, as shown in FIG.

Subsequently, as shown in FIGS. 4 and 5 (a) to (b), the bullet-like punch 5 is pushed in from the processed hole <1> side having the cut of the outer web 2a, and the hole is widened. A burring process is performed on the cylindrical shape, and the forming process is performed to the shape shown in FIG. 5B. Next, as shown in FIG. 5C, the punch 6 is pushed into a cylindrical tip formed by burring (in the direction from the inner web 2b to the die 7) to perform eyelet processing. The end portion and the outer web 2a are firmly integrated to produce a light groove steel. The light grooved steel has a web size of about 100 to 150 mm, a flange size of about 30 to 100 mm, and a length of about 6 to 12 m.

(Example 2)
FIG. 7 is a cross-sectional view showing an example of a lip groove steel of a multilayer lightweight section steel according to the present invention. FIG. 7 shows an outer flange 1a, an inner flange 1b, an outer web 2a, an inner web 2b, a lip 3, and an eyelet joint. 4 and a fold line a. Hereinafter, it demonstrates along this.

In the molding process described in the first embodiment, the lip 3 is formed by bending it into a U-shape and, further, as shown in FIG. Next, eyelet bonding is applied to the contact between the end of the inner web 2b and the back surface of the outer web 2a to produce 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 100 mm, a lip size of about 10 to 20 mm, and a length of about 6 to 12 m.

As described above, according to the multi-layer lightweight section steel according to the present invention, it is a lightweight section steel material excellent in economic efficiency that emphasizes efficient cross-sectional performance and eliminates the need for rust-proof coating. The effect on steel frame prefabricated manufacturers is extremely large.

1a outer flange 1b inner flange 2a outer web 2b inner web 3 lip 4 eyelet joint 5 bullet punch 6 punch 7 die
<1> Hole with cut
<2> Circular hole A Bending line B Folding point
8 Prior art flange 9 Prior art web 10 Prior art lip

Claims (4)

A pre-plated long steel plate is bent along the longitudinal direction into 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, A light grooved steel comprising a single plate at the center, overlapping the end sides of the inner and outer webs formed at both ends of the long side of the steel plate, and fixing the webs to each other by eyelet bonding at a predetermined interval. Multi-layer lightweight section steel characterized by A lip and a flange formed by bending a pre-plated long steel plate along the longitudinal direction into a substantially C-shaped cross-sectional shape, folded back 180 degrees from the lip end of the substantially C-shaped cross-sectional shape, and a double steel plate; A lip groove in which the central portion of the web is formed of a single plate, the end sides of the inner web and the outer web formed at both ends of the long side of the steel plate are overlapped, and the webs are fixed to each other by eyelet bonding at a predetermined interval. Multi-layered lightweight shape steel characterized by shape steel. Pre-plated long steel sheet along the longitudinal direction to form bent to the cross-sectional shape substantially U a flange in which the steel sheet to the double bend the substantially U-section flange tip 180 degrees folded shape, the web A light grooved steel comprising a central portion made of a single plate and superposing the end sides of the inner web and the outer web formed on both ends of the long side of the steel plate, and fixing the webs to each other by eyelet bonding at predetermined intervals. A method for producing a multi-layered lightweight section steel . A lip and a flange in which a pre-plated long steel plate is bent into a substantially C-shaped cross-section along the longitudinal direction, and the steel plate is doubled by bending 180 degrees from the lip end of the substantially C-shaped cross-sectional shape; and A lip groove shape in which a central portion of the web is constituted by a single plate, and the end portions of the inner web and the outer web formed at both ends of the long side of the steel plate are overlapped, and then the webs are fixed to each other by eyelet bonding at a predetermined interval. A method for producing a multi-layered lightweight section steel characterized by steel .

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