JPH10299172A - Thin steel support - Google Patents

Abstract

(57) [Problem] To provide a thin steel plate supporting member that can be integrally processed by bending a thin steel plate and that can be fixed to a mounting hardware according to a design drawing designed to receive the most reasonable force. SOLUTION: This is a supporting member made of a thin steel plate having a predetermined length and fixed to a mounting hardware 8, and the supporting member is formed by bending a first flange 20 and a second flange 21 at both ends of a web 18. The third flange 22 is provided by folding the tip of the first flange 20 to form a substantially J- or inverted-J-shaped end face as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin steel plate which is suitable for use as a steel rafter constituting a roof foundation of a reinforced earthquake-resistant structure mainly in a steel house, and which can also be used as other building members. It relates to a support member.

[0002]

2. Description of the Related Art In steel houses, an H-beam 1 shown in FIG. 11 and a C-beam 2 shown in FIGS. 13 (A) and 13 (B), and FIG.
A section steel 35 having a box-shaped cross section shown in (B) is used.

[0003]

The H-beam 1 shown in FIG.
In this case, since the joining between the web 4 and the flange 5 involves joining work such as welding, it cannot be easily formed. In addition, there is a problem that the lower flange 5 hinders the attachment of the H-section steel 1 to the lower structure.

The C-shaped steel 2 shown in FIG. 12 is easy to form and attach to a substructure, but has the following disadvantages. That is, as shown in FIG. 12B, the web 10 is applied to the mounting hardware 8 fixed to the lower structure 6 via the legs 7.
The mounting bolt 12 is inserted into the bolt insertion hole 11 formed in the web 10 and the mounting hardware 8, and the nut 13 is fastened to fix both members. At this time, the center line L ₁ of the C-shaped steel 2 of the flange 14 is displaced from the center line S or module line L of the design drawing which is designed to match with this mounting hardware 8. For this reason, both design and construction become difficult, and furthermore, the fittings 8 and the C-shaped steel 2 receive a bending moment and are likely to be twisted due to the above-mentioned displacement, which is disadvantageous in terms of structure.

[0005] In the Z-section steel 3 shown in FIG.
5 When a is fixed to the mounting hardware 8, the center line L ₁ of the flange 16 does not coincide with the center line S of the mounting hardware 8 (or module line L of the design drawings), since the shifted, the same design, There are problems that both the construction becomes difficult and that the construction is disadvantageous.

In a box-shaped section steel 35 shown in FIG. 14, a long bolt 33 is inserted through each side plate (corresponding to a web) 31 and a bolt insertion hole 32 formed in the mounting hardware 8 to form a nut 34. To secure. At this time, the center line L ₁ of the flange 36 of the box-shaped steel 35 is deviated from the center line S i.e. the design drawing module line L of the mounting hardware 8.
In addition, since one side plate 31 is bent inward as indicated by a two-dot chain line, it is difficult to design and construct. Further, the mounting metal 8 bears a bending moment due to the above-mentioned displacement. Is also disadvantageous.

The present invention solves the above-mentioned conventional problems. A supporting member made of a thin steel plate can be formed only by bending, and when the supporting member is joined to a substructure, the center line of the flange of the supporting member can be adjusted. It can match the module line on the design drawing, and it can demonstrate high strength even if it is long, and even if it is incorrectly mounted on the other side of the mounting hardware, it will be properly mounted on one side side at the correct position It is an object of the present invention to provide a thin steel plate supporting member which is superior in construction on site and has the same effect in structural design.

As the shape of the thin steel plate supporting member of the present invention, a substantially J or substantially inverted J shape is defined as follows. A first flange and a second flange are provided integrally on both ends of the web, and a third flange is provided on the end of the first flange, which is folded back from the tip of the first flange and integrally formed with the first flange. And the other end of the third flange is provided so as to extend in a direction opposite to the first flange (an opposite direction with a web as a boundary), and the first flange and the second flange are provided. The substantially inverted J-shaped end face shape arranged on the same side of one side of the web is substantially inverted J shape, and one of the first flange and the second flange is arranged on one side of the web, and the other. Is referred to as a substantially J-shaped end face disposed on the other side of the web. It is preferable that the first to third flanges are provided continuously at a right angle to the web, and it is preferable that the first to third flanges are disposed in parallel with each other.

[0009]

In order to achieve the above-mentioned object, the present invention provides a thin steel plate support member having a predetermined length and fixed to a mounting bracket, wherein the support member is formed of a web. Both ends are bent in the same direction or opposite directions to provide a first flange and a second flange, and the end of the first flange is folded back to provide a third flange to form a substantially J-shaped or substantially inverted J-shaped end face. It is characterized by the following. Also, the present invention
A dimension a from the tip of the third flange to the web,
The ratio of the dimension b from the base end of the third flange on the bending side to the web, the dimension c between the second flange and the third flange, and the dimension d from the web to the tip of the second flange is a ≦ c / 2. , B ≦ c / 2, d ≦ b. Further, it is preferable that the thickness of the mounting hardware is t, and the third flange has a relation of ab = t. In addition, a lip may be formed by bending one or both of the second flange and the third flange.

[0010] According to the present invention, it can be integrally molded by bending a thin steel plate support members, moreover, when the mounting construction of this the mounting hardware, facilitates centerline L of the support member and the module line L ₁ on the design drawings , Can be surely matched, and does not require correction work.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a steel rafter 17 according to a first example among steel rafters shown as a specific example of a thin steel plate support member of the present invention. This steel rasp 17 is formed by bending a single thin steel plate having a thickness of 0.8 mm to 2.0 mm, in most cases, 1.0 mm in thickness and a predetermined length by roll forming. It is formed into an end face shape (abbreviated as a substantially inverted J-shape), that is, a web 18 and a first flange (upper flange) 20 and a second flange (lower flange) 21 are formed at upper and lower ends of the web 18 respectively. Then, the front end of the first flange 20 is turned up and overlapped on the upper surface of the first flange 20 to form the third flange 22, thereby forming the steel slack 17. Further, the center line L ₁ of the width of the third flange 22,
The web 18 on the side opposite to the second flange 21 side is arranged on the same straight line as the center line of the mounting hardware 8 described later.
側面 of the thickness of the mounting hardware 8 from one side (rear surface described later)
The width of the third flange 22 is set so that the steel flange 17 is deviated by a distance t.

That is, as shown in FIG. 2, a dimension a from the tip to the center of the third flange, a dimension b from the base end of the third flange on the bending side to one side of the web 18, a second flange and a third The dimension c between the flanges, the dimension d from the web to the tip of the second flange, and the ratio of a, b, c, d are a ≦ c / 2, b ≦ c / 2, d ≦ b. The web 18 is positioned such that one side of the web 18 is located at a position (a position where a−b = t) shifted from the center line L ₁ of the mounting member 8 by half the thickness t of the mounting hardware 8.
Is most preferable in terms of construction. With this configuration, when the web 18 is brought into contact with and attached to the mounting hardware 8, the center of the third flange 22 in the width direction coincides with the center line of the mounting hardware 8, resulting in an ideal construction state.

The steel bark 17 has a predetermined length L ₃ , as shown in FIG. 1, and is attached to the lower structure 6 which is a purlin via a mounting hardware 8. That is, the horizontal leg 7 at the lower end of the vertically mounting fitting 8 is fixed to the upper surface of the lower structure 6 such as a purlin by welding or fixing means such as bolts. The back side of the web 18 of the horizontal steel bar 17 is applied,
The steel bolt 19 is fixed to the mounting hardware 8 by inserting the mounting bolt 24 through the mounting metal 8 and the bolt insertion hole 23 of the web 18 and fastening the nut 25.

Since the dimensional relationship of each part of the steel rasp 17 is provided as described above, when it is mounted on the mounting hardware 8 as shown in FIG. 4, the center line S of the mounting hardware 8 and the third flange 2
Center line L ₁ of 2 matches. Also, as shown in the figure, a field plate 26 is placed on the upper surface of the third flange 22 of the steel rafter 17, and a drilling tapping screw 27 is driven through the field plate 26 into the third flange 22. Field board 2
6 is fixed to a steel barb 17. When the steel bark 17 receives the load of the field plate 26, the third flange 2
Since the center line L ₁ of 2 coincides with the module line of the design load is given from the sheathing roof board 26 with substantially balanced on the left and right of the third flange 22, whereby the web 18, along the width direction Therefore, the web 18 does not act in the direction in which the web 18 is bent due to the force, and therefore, can receive the load in the most desirable manner in terms of strength.

FIG. 5 shows a second embodiment as a modification of the first embodiment. The steel rasp 17 of the second embodiment
In FIG. 3A, a first lip 28 is provided so as to be integrally bent upward at a right angle from the end of the second flange 21 and is integrally bent downward at a right angle from the end of the third flange 22. The second lip 29 is provided by being continuously provided.

According to the second embodiment, the first lip 2
The provision of 8 improves the strength of the second flange 21 against twisting, and thus the strength of the web 18 against twisting. Similarly, the provision of the second lip 29 improves the strength of the third flange 22 against twisting,
As a result, the strength of the first flange 20 against twisting, and further, the strength against twisting of the web 18 is improved. In this way, the synergistic action of the first lip 28 and the second lip 29 further improves the strength of the entire steel rafter 17 against twisting and bending.

FIGS. 6 and 7 show a steel barb 17b according to a third embodiment of the present invention. In the third embodiment, the second flange 21 on one end side of the web 18 of the steel rafter 17b is formed by bending the second flange 21 in the opposite direction to the second flange 21 of the first embodiment, and is formed in a substantially J shape. I have. In both the first and third embodiments, the second flange 21 twists the web 18 even if the bending direction is reversed,
Since the strength against bending or the like is improved, the same effect as the steel rasp 17 of the first embodiment is exerted in the steel rasp 17b of the third embodiment.

In the third embodiment, as shown in FIG. 6, the dimensions of the parts a, b, c, and d are the same as those in the first embodiment.

Next, the span L ₂ (shown in FIG. 1) of the lower structure 6 that supports the steel beams 17, 17 a, 17 b of the first, second, and third embodiments is long, and the mounting hardware 8, 8 are long, the portions where the bending strength and rigidity are insufficient at the intermediate portions of the steel beams 17, 17a and 17b are, for example, shown in FIG.
Can be easily reinforced as shown in FIG.

That is, in the example shown in FIG. 8, a short reinforcing member 17a-1 having the same cross-sectional shape as that of the steel rafter 17a having the same structure as that of the second embodiment is reversely assembled, and The webs 18 are partially overlapped with each other, and a plurality of drilling tapping screws 3
By hitting 0 and 30, the steel barb 17 and the reinforcing member 17a-1 having the same cross-sectional structure can be integrated and easily reinforced.

Therefore, the steel rasp 17a reinforced by the reinforcing member 17a-1 is sufficiently reinforced at the central portion where bending strength and rigidity are insufficient, so that the steel rafter 17a is reinforced.
No need to change the cross-sectional shape of the member or increase the thickness of the members.
The proof stress can be exhibited. Third flange 2 of steel rafter 17a
2 On the upper surface, a base plate 26 is provided with a drilling tapping screw 3
Fixed by 0.

FIG. 9 shows, as a fourth embodiment of the present invention, a usage pattern slightly different from that of the first embodiment with respect to the mounting hardware 8 of the steel barb 17a. That is, in the first embodiment, the upper end 31 of the mounting hardware 8 is located in the middle of the back surface of the web 18 of the steel bar 17a,
In the embodiment, the upper end 31 of the mounting hardware 8 is the third flange 2.
2 so as to reach the lower surface. Other structures are the same as those of the first embodiment. In the fourth embodiment, since the upper end 31 of the mounting hardware 8 extends until it comes into contact with the lower surface of the third flange 22, the strength is further improved from the bonding strength between the mounting hardware 8 and the steel bar 17 in the first embodiment. I do.

Next, referring to FIGS. 10A and 10B, a case in which a steel rasp 17 is attached to a regular position of the mounting hardware 8 as an example of the thin steel plate supporting member of the present invention (see FIG. A case in which the steel rasp 17 is attached to the mounting hardware 8 in the wrong direction (FIG. B) will be described. In both cases (A) and (B) of FIG.
Center line of the third flange 22 (surface) L ₁ is to be positioned on the center line of the mounting hardware 8 (surface) S collinear (same plane) in, Ki also serving made the steel in any case 1
7 can function as a supporting member equivalent to a structural member and a supporting member of the base plate 26. Further, even when the end portions of the adjacent left and right base plates 26 are arranged at the center of the third flange 22, they can be attached without any trouble, so that the degree of freedom in design and construction is increased. On the other hand, in the case of each of the conventional steel sections, when the steel sections 1, 2, 3 are mounted on one side of the mounting hardware 8, the upper flanges 5, 14, 16, 36 are formed.
Are disposed so as to be deviated to one of the one side surface and the other side surface of the mounting hardware 8, so that the ends of the respective base plates 26 are mounted on the upper flanges 5, 14, 16, and 36. If the section steels 1, 2, 3, and 35 are erroneously attached to the other side of the mounting hardware 8, one of the base plates 26 cannot be mounted on the upper flanges 5, 14, and 16, so that mounting is not possible. become unable.

The present invention is not limited to the illustrated embodiment,
The technical scope described in the claims includes a range in which a person skilled in the art can change the design of the embodiment.

The thin steel sheet supporting member of the present invention can also be used as a beam member, a frame member, or other building members. When the present invention is carried out, since the thickness of the web is relatively thin, the overhang length of each of the first and third flanges may be set to 0.

[0026]

As described above, according to the supporting member made of a thin steel plate in a steel house or the like according to the present invention, it can be easily formed because it can be formed only by bending.
When a thin steel plate support member is joined to a substructure via mounting hardware, the web is located at a position where the center of the flange of the support member coincides with the module line in the design, so construction can be performed as designed. And simplification of design and construction can be achieved. Further, the provision of the lip on the flange further improves the strength of the support member. In addition, the degree of freedom in design and construction when attaching to the mounting hardware is increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a steel rafter according to a first embodiment of the present invention is mounted on a mounting hardware.

FIG. 2 is an enlarged end view of the steel rafter of FIG. 1;

FIG. 3 is a perspective view of the steel rafter of FIG. 2;

FIG. 4 is a cross-sectional view showing a state in which a steel rafter according to a second embodiment is mounted on a mounting hardware.

FIG. 5 is a perspective view of the steel rafter of FIG. 4;

FIG. 6 is an end view of a steel rafter according to a third embodiment.

FIG. 7 is a perspective view of the steel rafter of FIG. 6;

FIG. 8A is an end view showing a steel rafter reinforcement structure as a fourth embodiment, and FIG. 8B is an end view showing a state in which a field board is also attached.

FIG. 9 is a cross-sectional view showing a mounting state of a steel rafter different from FIG. 4 as a fifth embodiment.

FIG. 10 is an explanatory view in the case of attaching a steel rafter to a mounting hardware.

FIG. 11 shows H as a first conventional example of a thin steel plate supporting member.
It is an end elevation of a shape steel.

FIG. 12A is an end view of a C-shaped steel shown as a second conventional example, and FIG. 12B is a cross-sectional view showing a state of attachment to a fitting.

FIG. 13A is an end view of a Z-section steel shown as a third conventional example, and FIG. 13B is a cross-sectional view showing a state of being attached to a fitting.

FIG. 14A is an end view of a box-shaped steel shown as a fourth conventional example, and FIG. 14B is a cross-sectional view showing a state of being attached to a fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 H-section steel 2 C-section steel 3 Z-section steel 4 Web 5 Flange 6 Substructure 7 Leg 8 Mounting hardware 10 Web 11 Bolt insertion hole 12 Mounting bolt 13 Nut 14 Flange 15 Web 16 Flange 17 Steel beam 18 Web Reference Signs List 20 first flange 21 second flange 22 third flange 23 bolt insertion hole 24 mounting bolt 25 nut 26 field plate 27 drilling tapping screw 28 first lip 29 second lip 30 drilling tapping screw 31 side plate 32 bolt insertion hole 33 bolt 34 Nut 35 Box-shaped section steel

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takao Koyama 1-1-2 Yurakucho, Chiyoda-ku, Tokyo Asahi Kasei Kogyo Co., Ltd. (72) Inventor Kazumi Muto 1-2-1, Yurakucho, Chiyoda-ku, Tokyo Asahi Chemical Industry Co., Ltd.

Claims (4)

[Claims] 1. A support member made of a thin steel plate having a predetermined length and fixed to a mounting hardware, wherein the support member has a first flange and a second flange formed by bending both ends of a web, A thin steel plate support member characterized in that the end portion of one flange is turned up to provide a third flange to form a substantially J-shaped or substantially inverted J-shaped end surface shape. 2. A dimension a from the distal end of the third flange to the web, a dimension b from a base end of the third flange on the bending side to the web, a dimension c between the second flange and the third flange, a web. 2. The thin steel sheet supporting member according to claim 1, wherein the ratio of the dimension d from the first flange to the tip of the second flange is a ≦ c / 2, b ≦ c / 2, d ≦ b. 3. The thickness of the mounting hardware is t, and ab = b
3. The thin steel plate supporting member according to claim 2, wherein the third flange is formed in a relation of t. 4. The thin steel sheet supporting member according to claim 1, wherein a lip is formed on one or both of the second flange and the third flange.