JPH10219927A - Structure shape material for construction and bottom-raised end forming method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide structure shape material for construction of floor joist material and the like which is easy in manufacture and whose cost can be reduced by folding both the ends of the two-layer-like shape material of cross section H-shape formed of a metal plate up to a prescribed height position and drawing processing and bottom- raising them. SOLUTION: With regard to H-shape material 1 which is floor joist material, a wide and thin metal plate is gradually molded into a circular pipe through a forming roll group so that both edge parts are mutually approached at a just above position. Next, both the edge parts are butt-welded to form the cross section circular pipe. The circular pipe outer face of the outside rise part of the welded part is cut in a same face, and then the circular pipe is made an angular pipe. The angular pipe is gradually molded into cross section H-shape through a sizing roll group, the whole shape is made a double layer to mutually be adhered. Bending and drawing by press- forming or roll forming are performed on both the ends 5, 5 of the H-shaped material 1, and bottom-raised ends 6, 6 in which a lower flange side is bottom-raised up to a prescribed height position are formed. Thereby the cost can be reduced, and sufficient strength can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural structural member for a building used as a joist, a beam or the like of a residential building. The present invention relates to a structural structural member having a raised end raised to a predetermined position and a method of forming the raised end.

[0002]

2. Description of the Related Art FIGS. 7A and 7B show conventional sections 31 and 41 used as joists mounted on a beam 30 made of a channel steel. In general, as can be seen from this figure, the joists 31 and 41 are provided with end portions 35 and 45 in order to keep the assembly height as low as possible.
Concave portions 36, 46 over the length x
Is formed so that the height dimension y of the end portions 35 and 45 is smaller than the height dimension H on the intermediate portion side of the profile.

[0003] Thus, in the conventional joist material profile 31 shown in FIG. 7A, a main member 31a made of square steel is used.
A reinforcing member 31b of a similar square steel whose both ends are shorter than the main member 31a by a required dimension x by welding is joined to the lower surface of the main member 31a by welding, and concave step portions 36 are formed on the lower surfaces of both ends. I have to. Also, in the conventional joist material profile 41 shown in FIG. 7B, the strip-shaped upper flange steel plate 41a and the lower flange steel plate 4 are respectively formed.
1b and the steel plate 41c for a web are welded to each other to form a profile 41 having an H-shaped cross section, and the lower portions of both ends of the steel plate 41c for a web of the H-profile 41 are cut off in a substantially hook shape, Along the cut edge, the lower flange steel plate 41b
Are bent and welded to form recessed steps 46 on the lower surfaces of both ends.

[0004]

In the above-mentioned conventional joist-shaped sections 31 and 41, a large-scale welding operation over almost the entire length of the sections is required to manufacture the sections. In addition, there is a problem that the production cost is very high when mass-producing is manufactured, and that the strength of the end portion of the profile is weakened. Accordingly, the present invention provides a structural structural member for a joist or the like capable of reducing the manufacturing cost and having sufficient strength at the end of the structural member, and a raised end of the structural member. It is an object to provide a forming method.

[0005]

According to a first aspect of the present invention, there is provided an architectural structural member having a double-layered H-shaped cross section comprising a web 2 and upper and lower flanges 3 and 4 made of a metal plate. 1 are characterized in that raised end portions 6, 6 whose lower flange 4 side is raised to a predetermined height position are formed at both end portions 5, 5 by bending and drawing.

According to a second aspect of the present invention, there is provided a method of forming a raised bottom end, wherein both ends 5, 5 of a profile 1 formed by a metal plate into a double-layered H-shaped cross section comprising a web 2 and upper and lower flanges 3, 4 are formed. 5 is formed by bending and drawing to form bilaterally symmetrical folds in each of the left and right layer portions 2a of the web 2 of each profiled end portion 5, so that the lower flange 4 side is raised to a predetermined height position. , 6 are formed.

A third aspect of the present invention is a method of forming the raised bottom end portion 6 of a structural member for building according to the second aspect, wherein each of the left and right layer portions 2a of the web 2 at each end portion 5 has a layer portion 2a. A fold P1 extending downward from the upper end of the outer edge 7 to the lower edge 8 of the layer portion 2a, and the slope P1 extending from the lower edge of the outer edge 7 of the layer portion 2a along the lower edge 8 of the layer portion 2a. It is characterized in that the fold P1 and the fold P2 extending so that the tip portions cross each other are formed symmetrically.

According to a fourth aspect of the present invention, there is provided a method for forming a raised bottom end 6 of a structural structural member for a building according to the second or third aspect,
Given the height H of the web 2 of the double-layered H-section 1, the length x of the raised bottom end 6, and the height y thereof, each left and right layer 2 a of the web 2 at each end 5 of the section. The outer surface has an intersection angle θ from the upper end 7o of the outer edge 7 of the layer portion 2a to the lower edge 8 of the layer portion 2a.
(Θ = tan ⁻¹ y / x), a concave folded line 9 obliquely provided, and an intersection 11 between the broken line 9 and a lower limit line 10 of the height y of the raised bottom end
And the length of the fold line between the intersection 12 of the concave fold line 9 and the lower edge 8 is L [L = (Hy) / cos (90 ° -θ)], and the perpendicular line from the intersection 11 13 and a line 14 that bisects the intersection angle θ between the concave folding line 9 and the lower edge 8 is 15
The concave fold line 16 extending from the intersection 15 to the outer edge 7 of the layer portion in parallel with the concave fold line 9 and the lower edge line 8, respectively.
17 and a space 2K between the concave fold line 16 and the concave fold line 9 and between the concave fold line 17 and the lower edge 8 (K = L × tan θ / 2 × 1/2). Are provided, and the convex fold lines 18 and 19 extending in parallel are provided.
A line between the intersection 20 and the intersection 12 where the lines 8 and 19 intersect on the bisector 14 is a convex fold line 21, and a line between the intersection 15 and the intersection 20 is a concave fold line 22; Further, a portion extending from the intersection 12 along the lower edge 8 to the outer edge 7 of the layer portion is defined as a concave fold line 8o.
o, 9, 16, 17, 22 and the convex fold lines 18, 19,
21 to form a raised bottom end portion 6 having a length x and a height y by bending and drawing so that the web layer portions on both sides of each convex fold line form folds P1 and P2 which overlap each other. And

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A shows a profile 1 formed by a metal plate into a double-layered H-shaped cross section composed of a web 2 and upper and lower flanges 3 and 4. B) forms raised end portions 6, 6 in which the lower flange 4 side is raised to a predetermined height position by bending and drawing such as press forming or roll forming at both end portions 5, 5 of the double-layered profile 1. In addition, an H-shaped member 1 used as a joist to be mounted on the beam 30 is shown. In FIG. 2B, reference symbol H denotes the height of the web 2 in the H-shaped member 1, x denotes the length of the raised end 6, and y denotes the raised end 6.
Shows the height dimension of

As shown in FIG. 5, the double-layered profile 1 has a cross section H by a web 2 and upper and lower flanges 3 and 4.
The web 2 is formed by the left and right layer portions 2a, 2a, and the upper and lower flanges 3, 4 are formed by the upper and lower layer portions 3a, 3a, 4a, 4a in a double layer shape in which the inner surfaces are in close contact with each other. Is formed.

Next, a method of forming the above-described H-shaped section 1 will be described with reference to FIGS. In addition, as the metal plate M used in this manufacturing method, for example, a zinc-plated plate thickness 1.2 mm (net thickness 1.15 mm),
A thin steel plate with a width of 350 mm (trade name: Sumitomo Galfan) is used.

In this forming method, a wide thin metal plate M as shown in FIG. 6 is used, and this metal plate M is first passed through a forming roll group (not shown) of a roll forming apparatus. As shown in FIG.
Are gradually formed into a tubular shape such that both edge portions e, e thereof approach each other directly above the center portion in the width direction. The two edge portions e and butt are butt-welded to form a circular tube Mo having a circular cross section as shown in the figure. Immediately after the welding, the outer bead bulge portion B1 of the butt weld portion W in a red-hot state.
Is cut off by a cutting tool (not shown) so as to be flush with the outer surface of the circular tube Mo, and then the circular tube Mo is formed into a tube Ms having a slightly angular cross-sectional shape as shown in FIG.

Next, the tube Ms, which is angular as described above, is passed through a group of sizing rolls (not shown) of a roll forming apparatus to form a tube Ms that is further angular. While maintaining the position of the welded portion W at a constant position, it is gradually formed into an H-shaped cross section as shown in FIGS. 6 to 6, and finally, as shown in FIG. It is formed into a shape 1 having an H-shaped cross section, which is formed in a multilayer shape and is in close contact with each other.

As shown in FIG. 5, a corner portion between the upper and lower end portions of each layer portion 2a of the web 2 and the inner layer portions 3a, 4a of the upper and lower flanges 3, 4 is formed by a roll. Since the radius R is inevitably formed by the molding process, a gap having a substantially triangular cross section is provided between the radius R of the upper and lower ends of the web 2 and the outer layer portions 3a and 4a of the flanges 3 and 4. 33 are formed over the entire length of the metal profile P. By passing the tube body Ms through the group of sizing rolls while maintaining the position of the welded portion W at a fixed position directly above as described above, the inner weld bead protrusion B of the welded portion W is formed.
2 (see FIG. 5 and FIG. 6) does not swell in the gap 33 during the roll forming process and does not swell outwardly against the opposing layers of the web 2 and the flange 3, so that the appearance is reduced. Is not impaired, and there is no hindrance when the metal profile 1 is used.

The end portions 5 and 5 of the double-layered profile 1 having the H-shaped cross section formed as described above are bent and drawn by press molding or roll forming or the like, and the web of each profile end 5 is formed. By forming symmetrical folds in each of the left and right layer portions 2a, the lower end 4 of the profile end 5 is raised to a predetermined height from the lower flange side of the intermediate portion of the profile. , 6 are formed. Specifically, as shown in FIGS. 1A and 1B, the outer edge 7 of the layer 2a is formed on the outer surface of each layer 2a on the left and right sides of the web 2 at each end 5 of the layer. The fold P1 extending downward to the lower edge 8a of the layer 2a in an inclined manner, and the inclined fold P1 and the tip end intersect with each other along the lower edge 8 of the layer 2a from the lower end of the outer edge 7 of the layer 2a. By forming two folds each with the fold P2 extending so as to be symmetrical, the raised end portion 6 having a length x and a height y can be formed as shown in FIG.

In this case, the inclined fold P1 does not necessarily need to be formed from the upper end 7o (see FIGS. 2 and 3) of the outer edge 7 of the layer portion, but is inclined downward from a position below the upper end 7o. It may be formed, but it is necessary to form the tip of the inclined fold P1 so as to reach the lower edge 8 of the layer 2a. The inclination angle θ of the inclined fold P1 can be set arbitrarily arbitrarily, and the protruding heights of the folds P1 and P2 can be set arbitrarily arbitrarily. However, in this case, the length x and the height y of the raised bottom end 6 depend on the inclination angle θ of the inclined fold P1, the lengths of the folds P1 and P2, the protruding height of the folds P1 and P2, and the like. X and y raised end portions 6 will be formed.

As described above, on the outer surfaces of the left and right layers 2a of the web 2 at the end portions 5 of the web, the lower end 8 of the layer 2a extends downward from the upper end of the outer edge 7 of the layer 2a. Fold P1,
The inclined folds P1 and the folds P2 extending from the lower end of the outer edge 7 of the layer portion 2a along the lower edge 8 of the layer portion 2a so that the tip portions cross each other are formed symmetrically. If
The raised end 6 having sufficiently higher strength than the recessed steps 36, 46 formed on the conventional profiled ends 35, 45 shown in FIG. 7 can be formed, and the cross-sectional shape of the raised end 6 is as follows. As can be seen from FIG.
The cross-section is substantially H-shaped, which is almost the same as the shape, and the appearance of the end of the profile 1 is not impaired.

Next, the height H of the web 2 of the double layered H-shaped member 1, the length x of the raised bottom end 6, and the height y thereof are actually used as shown in FIG. FIG. 4 shows a method for easily forming a raised bottom end 6 having almost the same size as the set size when the height is set to a predetermined size by the height and width of the beam material 30. 2 and FIG. In this case, H = 9
0 mm, x = 128 mm, y = 60 mm, and the thickness of the metal plate is ignored.

First, on the outer surfaces of the left and right layers 2a of the web 2 at the front and rear ends 5 of the front and rear sections of the double layered H-section 1, the layers 2a
A concave fold line 9 obliquely formed at an intersection angle θ from the upper end of the outer edge 7 of the lower layer 8 to the lower edge 8 of the layer portion 2a. Is obtained from the height H of the web 2, the length x of the raised end 6 and the height y thereof. That is, since tan θ = y / x, θ = tan ⁻¹ y / x, where x = 128 mm,
Substituting y = 60 mm results in θ ≒ 25 °. Therefore, from the upper end 7o of the outer edge 7 of the web layer portion 2a, the layer portion 2
A line that intersects the lower edge 8a at an intersection angle θ ≒ 25 ° is drawn, and this line is defined as a concave folded line 9. Note that the concave fold line is a line that is bent so that the fold line is retracted inward, and each concave fold line is shown by a solid line in FIG.
In addition, the convex fold lines described later refer to lines that are bent so that the fold lines protrude outward.
Are indicated by broken lines.

Next, the length of the fold line between the intersection 11 between the concave fold line 9 and the lower limit line 10 of the height y of the bottom raised end and the intersection 12 between the concave fold line 9 and the lower edge 8 Is L, and the intersection of a perpendicular line 13 from the intersection 11 and a line 14 bisecting the intersection angle θ between the concave folding line 9 and the lower edge 8 is set as 15, and from the intersection 15 A concave fold line 16, 17 extending in parallel with the concave fold line 9 and the lower edge line 8, respectively, is provided on the outer edge 7 of the layer portion, and between the concave fold line 16 and the concave fold line 9, and Convex fold lines 18 and 19 are provided between the concave fold line 17 and the lower edge 8 so as to divide the respective intervals 2K into two equal parts and extend in parallel. A line between an intersection 20 where the biconvex fold lines 18 and 19 intersect on the bisector 14 and the intersection 12 is defined as a convex fold line 21.
A line between the intersection 15 and the intersection 20 is defined by a concave folding line 22.
The lower edge 8 extending from the intersection 12 along the lower edge 8 of the layer to the outer edge 7 of the layer is defined as a concave folding line 8o.

In this case, between the concave fold line 9 and the convex fold line 18, between the convex fold line 18 and the concave fold line 16, the concave fold line 8o
And the convex fold line 19 and the interval K between the convex fold line 19 and the concave fold line 17 are K = L × tan θ / 2 × 1/2
, L = h / cos (90 ° −θ) = (Hy) / cos (90
° -θ). That is, in these equations, θ
= 25 °, H = 90 mm, y = 60 mm,
L = 30 / cos 65 ° = 71 mm, K = 71 × tan1
2.5 ° x 1/2 ≒ 7.8 mm, and 2K ≒ 15.6
mm.

Therefore, as shown in FIG. 2 and FIG. 3, after the concave fold lines 9, 8o are provided on the outer surfaces of the respective left and right layer portions 2a of the web 2, the layer portions are determined based on the dimension value of K 層 7.8 mm. 2a
Concave fold lines 16, 17, 22 and convex fold lines 18, 1 on the outer surface
9 and 21 and folds P1 and P2 where the respective web ply portions of each convex fold line 18, 19 and 21 overlap each other.
By bending and drawing to form
The raised end 6 as shown in FIG. 1B can be formed easily and easily.

The folds P1, P2 of the raised end 6 described above.
In the forming process, the outer edge 7 of the layer portion 2a shifts from the vertical state shown by the imaginary line in FIG. 3 in an inwardly inclined shape as shown by the solid line in FIG. 3, and the upper end portion of the outer edge 7 of the layer portion It will be in the state which overlaps on the concave folding line 9. As can be seen from FIG. 3, the shift width W of the layer outer edge 7 at this time is W = 2 × K ×
is obtained by the equation of sin θ, and K ≒ 7.8 mm, θ
= 25 °, W ≒ 2 × 7.8 mm × sin25
° ≒ 6.6 mm. Accordingly, the substantial dimension of the length dimension x of the raised bottom end 6 is shorter than the initially set 128 mm by about 6.6 mm.

[0024]

According to the structural member for building according to the first aspect of the present invention, the lower flange 4 side is provided with a predetermined height by bending and drawing at both ends of the double-layer shaped member 1 having an H-shaped cross section. Since the main member and the reinforcing member shorter than the main member are welded and joined to each other, a concave step is formed at the end of the shape member because the base member is formed by raising the raised end portion 6 raised to the height position. In comparison with the conventional architectural structural members in which a plurality of strips are welded to form an H-shaped cross section at the end of the structural member and then cut and further welded to form a concave step, the manufacturing of the structural member is easier and cost-effective. In addition to this, it is possible to reduce the cost, and it is possible to secure sufficiently excellent strength, particularly at the raised end of the end of the profile.

According to the method of forming a raised bottom end according to the second aspect of the present invention, both ends 5, 5 of the double-layered section 1 having an H-shaped cross section are bent and drawn to form a web of each section end 5. By forming left and right symmetrical folds in each of the left and right layer portions 2a, the raised bottom end portion 6 is formed, which is sufficiently superior to the concave step portion formed in the conventional profiled end portion. A raised bottom end having strength can be easily formed at both ends 5 and 5 of the profile 1.

According to the method of forming a raised bottom end according to the third aspect of the invention, the outer edge 7 of the layer 2a is formed on the outer surface of each layer 2a on the left and right sides of the web 2 of each profiled end 5 from the upper end side of the layer 2a. The fold P1 extending downward to the lower edge 8 of the layer 2a, and the tip of the inclined fold P1 intersects with the lower edge 8 of the layer 2a along the lower edge 8 of the layer 2a. Is formed symmetrically with the fold P2 extending to the left and right, so that the raised bottom end having a strength sufficiently higher than that of the concave step formed at the end of the conventional profile is formed at the cross-section of the intermediate portion of the profile. It can be formed into a cross-sectional shape that is almost the same as the H shape, and therefore does not impair the appearance of the profile.

According to the method of forming a raised end portion according to the fourth aspect of the present invention, the height H, the length x of the raised end portion, and the height y of the web of the double-layered H-shaped member are determined by the shape member. If the predetermined dimensions are set in advance in accordance with the usage conditions of the web 2, after forming the concave fold lines 9, 8o on the outer surfaces of the left and right layer portions 2a of the web 2, K (K is the concave fold line 9 and the convex Between the fold line 18, between the convex fold line 18 and the concave fold line 16, the concave fold line 8 o
And the convex fold line 19 and the interval between the convex fold line 19 and the concave fold line 17, respectively, where K = L × tan θ / 2 × 1
/ 2), the concave fold lines 16, 17, 22 and the convex fold lines 18, 19,
21 is formed and bent and drawn so as to form folds P1 and P2 where both side web layer portions of each of the convex fold lines 18, 19 and 21 overlap each other, so that the dimensions are almost the same as the above-mentioned predetermined dimensions. The dimensioned raised end 6 can be formed simply and easily.

[Brief description of the drawings]

FIG. 1 (A) is a perspective view showing a part of a double-layered profile having an H-shaped cross section, and FIG. 1 (B) shows a part of a double-layered profile having a raised end at an end of the profile. It is a perspective view.

FIG. 2 is a perspective view showing a state before a raised bottom end is formed at an end of the double-layered profile, and showing a state in which required concave fold lines and convex fold lines are provided on the outer surfaces of left and right layers of the web; It is.

FIG. 3 is a side view showing a raised end formed at an end of the double-layered profile, in which a shape end before forming the raised end is indicated by an imaginary line.

FIG. 4 is a side view showing a dimension setting state of each part of a raised end formed at an end of a profile.

FIG. 5 is an enlarged perspective view, partly in section, of an H-shaped double layered section.

FIGS. 6A to 6D are explanatory diagrams showing the steps of manufacturing an H-shaped double layered material.

FIGS. 7A and 7B are perspective views each showing a conventional structural member for building.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double layered profile of H-shaped cross section 2 Web of profile 2a Left and right layer portions of double layered web 3, 4 Upper and lower flanges of profile 5 End of profile 6 Bottom end 7 Upper edge of layer 8 Lower edge of layer part 9 Concave fold line 10 Lower limit line of bottom raised end height 11,12 Intersection point 13 Perpendicular line 14 Bisection line 15 Intersection point 16,17 Concave fold line 18,19 Convex fold line 20 Intersection 21 Convex fold line 22 Concave fold line P1, P2 Fold H Height of web of double layered profile x Length of raised end y Height of raised end θ Intersection angle

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shinichi Hori 3-26, Showa Minami-dori, Amagasaki-shi, Hyogo Prefecture Amagasaki Matsumoto Building New Building 4th Floor 401 Kantoku Metal Co., Ltd.

Claims (4)

[Claims] An end portion (5, 5) of a profile 1 formed by a metal plate into a double-layered H-shaped cross section composed of a web (2) and upper and lower flanges (3, 4) is bent at a lower flange 4 side by bending and drawing. An architectural structural member characterized by forming raised end portions (6, 6) raised to a height position. 2. Both ends 5, 5 of a profile 1 formed by a metal plate into a double layer shape having a H-shaped cross section composed of a web 2 and upper and lower flanges 3, 4 are bent and drawn. By forming bilaterally symmetrical folds on the left and right layer portions 2a of the web 2 of the portion 5, the lower flange 4 side is formed with raised end portions 6, 6 raised to a predetermined height position. Of forming raised bottoms of structural structural members for construction. 3. The left and right layers 2 of the web 2 at each profile end 5.
a, on the outer surface, a fold P1 extending downward from the upper end of the outer edge 7 of the layer 2a to the lower edge 8 of the layer 2a in an inclined manner, and from the lower end of the outer edge 7 of the layer 2a to the lower side of the layer 2a. A fold P2 extending along the edge 8 so that the inclined fold P1 and the tip end cross each other.
3. The method of forming a raised bottom end of a structural member for building according to claim 2, wherein the upper and lower parts are formed symmetrically. 4. The height H of the web 2 of the double layered H-section 1,
When the length x and the height y of the raised end 6 are given, the upper end 7o of the outer edge 7 of the layer 2a is formed on the outer surface of each layer 2a on the left and right of the web 2 of each profile end 5. A concave fold line 9 oblique to the lower edge 8 of the layer portion 2a at an intersection angle θ (θ = tan ^-1 y / x)
And an intersection point 11 between the folding line 9 and a lower limit line 10 of the bottom raised end height y, and an intersection point 12 between the concave folding line 9 and the lower edge 8.
L = (H−y) / cos (90 ° −
θ)], and the intersection of a perpendicular line 13 from the intersection 11 and a line 14 bisecting the intersection angle θ between the concave fold line 9 and the lower edge 8 is designated as 15, and from this intersection 15 to the outer end of the layer portion. The edge 7 is provided with concave fold lines 16 and 17 extending in parallel with the concave fold line 9 and the lower edge line 8, respectively, and between the concave fold line 16 and the concave fold line 9 and between the concave fold line 17 and the lower fold line 17. Convex fold lines 18 and 19 are provided between the side edges 8 so as to divide the interval 2K [K = L × tan θ / 2 × 1/2] in two and extend in parallel. A line between the intersection 20 intersecting on the bisector 14 and the intersection 12 is defined as a convex folded line 21,
A line between the intersection 15 and the intersection 20 is defined as a concave folding line 22, and the layer outer edge 7 extends from the intersection 12 along the lower edge 8.
The portion extending to the concave fold line 8o is defined by the concave fold lines 8o, 9, 16, 17, 22 and the convex fold lines 18, 1
9, 21 by bending and drawing so that the web layer portions on both sides of each convex fold line form folds P1 and P2 that are overlapped with each other, thereby raising the bottom end 6 having a length x and a height y.
The method for forming a raised bottom end of a structural member for construction according to claim 3, wherein