JPH0449614B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an assembled beam used for steel frames, bridges, etc., and particularly relates to an assembled beam that can provide high cross-sectional performance at low cost.

[Prior Art] For beams that require girder height, prefabricated beams are used in order to be lightweight and have high cross-sectional performance.
For example, as shown in Fig. 1, the girder height is set with a gap between beams 1 and 2 made of two section steel, and beams 1 and 2 are connected with diagonal members 3, etc., creating a so-called Warren truss structure. The constructed assembly beam 4 and the like are generally well known.

[Problem to be solved by the invention] In the assembled beam having such a structure, beams 1 and 2
In order to ensure the strength of the joint between the chord member 5 of the section steel and the connecting member 3 such as the diagonal member, the length of the joint for welding or bolting is increased as shown in Figures 2 to 4. If necessary, or as shown in FIGS. 1, 5 and 6, it is necessary to provide a gusset 6. When the length of the joint portion is increased, the members of the beams 1 and 2 become larger, which increases the weight and price accordingly. In addition, if the gusset 6 is provided, the shape steel and the gusset are separate members, so there is a problem that there will be many connection parts by welding, bolts, etc., and if each member is large compared to the size of the assembled beam 4, the gusset plate will also be damaged. The problem is that it has to be big.

Furthermore, as shown in Fig. 7, when the gusset 6 is joined to the side surface of the chord member 5 of the beam 1, an eccentric moment is generated due to the distance l between the center line of the gusset 6 and the center line of the chord member 5, and the stress becomes correspondingly weaker. Therefore, fatigue problems may occur.

In addition to the assembled beams mentioned above, honeycomb beams, as shown in Figures 8 and 9, are known in order to increase the girder height (for example, the
No. 35367, Jitko No. 55-39048, Jitko No. 56-52333
No. 57-41291, No. 15306, No. 12335, No. 12335, No. 147411, No. 147411, No. 147411, No. 147411.
No. 55-150113, Utility Model No. 55-150114).

This honeycomb beam 7 is obtained, for example, by cutting the belly plate 9 of the H-section steel 8 into a tooth shape and joining the crests 10 of the tooth shape. However, since the normal maximum height of a shaped steel is 900 mm, there is a limit to the girder height of a honeycomb beam, and once the shaped steel to be used is determined, the girder height cannot be set freely.

In order to solve the above-mentioned problems, the present invention provides an assembled beam that has a simple structure and can be manufactured at low cost while ensuring high cross-sectional performance, and can also set the girder height to any desired height. The purpose is to

[Means for Solving the Problems] The assembly beam of the present invention that meets this purpose is obtained by cutting a section steel belly plate whose upper and lower flanges extend in the same direction into a zigzag tooth shape, The beams are spaced apart from each other, and the tooth-shaped protrusions of one beam are connected to the tooth-shaped protrusions of the other beam through a connecting member made of shaped steel.

[Function] In such an assembled beam, since the connecting member is joined to the convex portion of the tooth profile cut into a zigzag uneven tooth profile, a sufficient joining length can be ensured even without a gusset. Furthermore, since there is no gusset, no eccentric moment is generated at the joint, reducing fatigue problems and improving cross-sectional strength.

Furthermore, since reinforcing members such as gussets are not required, the truss can be constructed using only shaped steel, and the two beams, each of which has a tooth-shaped belly plate, are connected by a connecting member with a gap between them, so the height of the girder can be reduced. It can be set arbitrarily.

[Embodiments] Hereinafter, preferred embodiments of the beam assembly of the present invention will be described with reference to the drawings.

10 to 13 show an assembly beam and its manufacturing process according to an embodiment of the present invention.
In the figure, 11 indicates two parallel flanges 12a, 1
2b and a belly plate 13 connecting flanges 12a and 12b. First, the belly plate 13 of the H-shaped steel 11 is cut into a zigzag tooth profile 14. Two cut beams 11a, 11
b is translated in the vertical direction, and the beam members 11a, 1
A space is provided between the flanges 12a and 12b such that the distance between the flanges 12a and 12b is a predetermined height.

Then, two beam members 11 with a distance between them
The convex portion 14a and the convex portion 14b of each of the tooth profiles 14 a and 11b are connected by a section steel (angle iron) 15 as a connecting member that is inclined with respect to the two beam members 11, and an assembled beam 16 of Warren truss structure is formed. is configured. The convex portions 14a and 14b are joined to the shaped steel 15 by bolting or welding.

Note that the structure of the truss may be other structures as necessary. For example, as shown in FIG. 14, two beam members 11a and 11b whose belly plates are cut with uneven tooth shapes 14 are arranged so that the convex portions 14a and 14b are vertically opposed, and the convex portions 14b and Convex part 1
4b mutually intersecting shape steel (angle steel) 17a, 1
7b and vertically extending shaped steel 18 to form an assembly beam 19 of a double Warren structure.

Further, the two beam members 11a and 11b do not need to be arranged in parallel. For example, as shown in FIG. 15, beam members 11a and 11b are arranged diagonally in a shape that widens toward the end as an assembled beam used for a ceiling beam of a building, and the convex portion 14a and convex portion 14b of the tooth profile 14 are formed into two parts. Shaped steel (angle steel) 20 that is inclined to the beam
a, 20b or vertically extending section steel 21 to form the assembly beam 22.

Furthermore, two or more chord members of the upper and lower beam members may be arranged in parallel as required. for example,
As shown in FIGS. 16 and 17, the flanges are cut into zigzag tooth profiles 23 of parallel H-beams joined to each other.
b are connected by a section steel (H section steel) 24 or the like which is interposed between the parallel convex parts 23a, 23a and between the convex parts 23b, 23b and is inclined with respect to the two beams to form an assembled beam 25. It's okay.

In the assembly beam configured as described above, the connecting members 15, 1 are connected to the convex portions 14a, 23a having sufficient height of the tooth profiles 14, 23 cut in a zigzag manner.
7a, 17b, 18, 20a, 20b, 21, 2
4 are joined, a sufficient joining length is ensured and joint strength is ensured without adding a gusset as in the conventional case. Also, since there is no gusset,
There is no eccentric moment between the gusset and the string as in the conventional case. Therefore, the fatigue strength at the joint is improved. Since the joint strength and fatigue strength are improved, the cross-sectional rigidity of the assembled beam is improved.

Further, when manufacturing an assembled beam, by eliminating the need for gussets, the number of joints is reduced, and it becomes possible to manufacture an assembled beam with a truss structure by simply combining section steel.

Furthermore, as described above, sufficient cross-sectional strength is ensured by joining the convex portions together using the connecting member, so the interval between the two beam members 11a and 11b can be freely set by appropriately adjusting the length of the connecting member. is,
The assembly beam is set to an arbitrary girder height. Moreover, since the string members are not connected to each other as in the conventional honeycomb beam, but are connected via a connecting member, the beam members 11a,
The beams 11b do not have to be parallel, and the assembled beam 25 can be easily widened toward the end if necessary.

In this example, H-section steel was used as the section steel to be cut into a zigzag tooth profile, but if the section steel has upper and lower flanges extending in parallel in the same direction,
It is possible to produce an assembled beam by cutting the belly plate of not only shaped steel but also I-shaped steel, channel steel, etc.

[Effects of the Invention] As explained above, when using the assembly beam of the present invention, the belly plate of the section steel whose upper and lower flanges extend parallel to each other in the same direction is cut into a zigzag uneven tooth shape. The two beams are spaced apart from each other, and the tooth-shaped convex portion of one beam is connected to the tooth-shaped convex portion of the other beam through a connecting member made of shaped steel. The following effects can be obtained.

(a) There is no need for a gusset for connection, and it is possible to eliminate the generation of eccentric moment caused by the gusset and the string material as in the past. Therefore,
It becomes possible to improve joint strength and fatigue strength, and it is possible to ensure high cross-sectional strength.

(b) Since the two cut beams are connected via a connecting member, it is possible to obtain any girder height by adjusting the length of the connecting member. Therefore, the degree of freedom in designing the assembled beam can be expanded, and the strength of the assembled beam can also be set arbitrarily.

(c) Since the protrusions of the tooth profile of one cut beam and the protrusions of the tooth profile of the other beam are connected using a connecting member made of section steel, a truss structure can be created by processing only commercially available section steel. It becomes possible to manufacture assembled beams, reducing costs and improving productivity.

(d) In the case of conventional honeycomb beams, two cut beams are directly connected to each other, so the two beams are inevitably parallel to each other, but in the present invention, It is no longer necessary to arrange the two cut beams in parallel.
Therefore, it is possible to construct beams that widen at the end.
It can also be applied to ceiling beams of buildings, etc.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional assembly beam, Figure 2 is a perspective view of a joint in a conventional assembly beam, Figure 3 is a perspective view of a joint in another conventional assembly beam, and Figure 4 is a conventional assembly beam. FIG. 5 is a perspective view of a joint in yet another conventional assembly beam; FIG. 6 is a perspective view of a joint in yet another conventional assembly beam; FIG. The figure is a sectional view of a conventional gusset part, Figure 8 is a front view of a conventional section steel for manufacturing honeycomb beams, Figure 9 is a front view of a honeycomb beam manufactured from the section steel of Figure 8, and Figure 10. 11 is a longitudinal sectional view of the apparatus shown in FIG. 10 taken along line XI-XI, and FIG. 12 is a front view of a section steel for manufacturing an assembled beam according to an embodiment of the present invention. FIG. 13 is a front view of an assembly beam according to an embodiment, and FIG. 13 is a longitudinal cross-sectional view of the apparatus shown in FIG. 12 taken along the line X-X. FIG. FIG. 15 is a front view of an assembly beam according to yet another embodiment of the present invention, FIG. 16 is a front view of an assembly beam according to still another embodiment of the invention, and FIG. 17 is a front view of an assembly beam according to still another embodiment of the invention.
- a longitudinal cross-sectional view along the X-ray; 11...H-shaped steel, 11a, 11b...beam material, 1
2a, 12b...flange, 13...belly plate, 1
4, 23...Tooth profile, 14a, 14b, 23a, 2
3b...Protrusion, 15, 17a, 17b, 18, 2
0a, 20b, 21, 24... connection member, 16,
19, 22, 25... assembled beams.

Claims (1)

[Claims] 1 Cut the belly plate of a sectioned steel whose upper and lower flanges extend parallel to each other in the same direction into a zigzag uneven tooth profile, create a gap between the two cut beams, and reduce the convexity of the tooth profile on one of the beams. 1. An assembled beam characterized in that the tooth-shaped convex portion of the other beam member is connected via a connecting member made of a section steel.