JPH0950U - Lattice beam - Google Patents

Abstract

(57) [Abstract] [Subject] It is to provide a lattice beam that enables all welding by a robot and can assemble the beam quickly. SOLUTION: The flange portion includes an upper chord member 25 formed of square steel and a lower chord member 26 formed of square steel and facing the upper chord member 25. The web part connects the oblique part 15 formed in a zigzag oblique manner and the adjacent oblique part 15, each of which is formed with a predetermined width and is horizontally formed flat. It is provided with a first welded portion group 16 and a second welded portion group 17, and is configured as a lattice material formed from one strip steel plate. Upper chord material 2
5 and the first welding portion group 16 are welded to each other, and the lower chord member 26 and the second welding
It is formed by welding together with the welding portion group 17.

Description

[Detailed description of the device]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a lattice beam used as a beam of a lightweight steel structure.

[0002]

[Prior art]

 Conventionally, as a beam with a lightweight steel structure, a metal member shaped in a T shape was used as an upper chord member and a lower chord member, and a small diameter round bar was bent into a continuous chevron shape, and the bent portion was flattened to form a flat portion. It has been proposed that lattice members with screw holes at the center line of the material and at the intersections are arranged on both sides of the T-shaped portion and are integrally configured by tightening screws or the like (Shokai Sho 55-2948).

[0003]

[Problems to be solved by the device]

 However, in the prior art, it is difficult to make the accuracy of the lattice material uniform when bending the round bar steel into a corrugated shape; it is difficult to make the spacing of the corrugated lattice uniform; It takes time to form the shape of the radius (curved) in the welded part (peak and valley) of; the welding by the robot cannot be done because the welding work of the radius cannot be simplified, and the lattice material is used as the beam material. However, the welding work time for welding to the welder was long and the beam assembly efficiency was poor;

Therefore, an object of the present invention is to provide a lattice beam that enables all welding by a robot and can assemble the beam quickly.

Another object of the present invention is to provide a lattice beam which has a high precision lattice structure and can be mass-produced.

Another object of the present invention is to provide a good lattice beam with uniform accuracy even when it is elongated.

[0007]

[Means for Solving the Problems]

 The lattice beam according to the present invention is a lightweight lattice steel beam including a flange portion and a web portion, wherein the flange portion is an upper chord member formed of square steel, and the upper chord member is arranged to face the upper chord member. A lower chord member made of steel is provided, and a web portion is formed by connecting a skew portion formed by skewing in a zigzag shape and an adjacent skew portion, each of which has a predetermined width. The first chord member and the first welding member are provided as a lattice member formed of one strip steel plate, which includes a first welding portion group and a second welding portion group that are horizontally and flatly formed. The lower chord member and the second welding portion group are welded together.

[0008]

[Embodiment of the invention]

 An embodiment of a lattice beam according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of a lattice member constituting the lattice beam of the present invention, FIG. 2 is a front view of the lattice beam of the present invention, and FIG. 3 is a schematic sectional view taken along the line AA of FIG.

In these figures, the lattice beam 20 is formed of a flange portion and a web portion.

Of these, the web portion is made of a lattice material 10. This lattice member 10 is formed of a single strip steel plate, and is formed with a predetermined width L by connecting the oblique portion 15 formed by obliquely zigzag and the adjacent oblique portions 15, 15. .. and a second group of second welding parts 17, 17 ... This lattice material 10 can be easily obtained by cutting a steel plate having a thickness of about 3.2 mm to 6.0 mm into the above shape by an automatic plasma or a laser beam. The length T of the lattice member 10 is set to, for example, about 910 mm or 1820 mm, and a plurality of lattice members 10 are continuously used in accordance with the length of the beam so that the length of the beam becomes long. Even in such a case, a good lattice structure can be provided with uniform accuracy over the entire length.

The flange portion is disposed above the lattice material 10 and is welded to the first welding portion group 16, 16, ... Of the lattice material 10, and the upper chord material 25. , And the lower chord member 26 welded to the second welded portion group 17, 17 ... Of the lattice member 10. The upper chord member 25 and the lower chord member 26 are made of square steel.

[0012]

[Effect of the invention]

 The present invention is configured as described above, and the present invention has the following effects. Lattice material with the same lattice structure is obtained by cutting one strip steel plate, so there is no need to separately process and form the lattice material for each beam, and the lattice structure has a uniform accuracy and good beam quality. The mass production of is possible. Since the horizontal and flat welds are formed by connecting adjacent diagonal sections with a certain width, the chord members and the lattice members are connected only by fillet welding to the weld portions, and the lattice members between the beams are connected. It has the advantages that the welding position is simple, robot welding is possible, and the work efficiency of assembling the lattice beam is extremely good. Even if the length is long, by using a plurality of unitized lattice materials continuously, it is possible to easily assemble a good lattice beam with uniform accuracy over the entire length.

[Brief description of drawings]

FIG. 1 is a front view of a lattice member that constitutes a lattice beam according to the present invention.

FIG. 2 is a front view showing a lattice beam according to the present invention.

3 is a schematic cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 10 Lattice Material 15 Oblique Part 16 First Welding Part Group 17 Second Welding Part Group 20 Lattice Beam 25 Upper Chord Material 26 Lower Chord Material

Claims (1)

[Utility model registration claims] 1. A lattice beam having a lightweight shaped steel structure comprising a flange portion and a web portion, wherein the flange portion is formed of an upper chord member formed of square steel, and is formed of a square steel member facing the upper chord member. The lower chords are connected to each other, and the web part connects the oblique part formed by obliquely forming a zigzag shape and the adjacent oblique parts, each of which is formed with a predetermined width and is horizontal and flat. Which is formed as a lattice member formed from a single strip-shaped steel plate, and includes the first welded portion group and the second welded portion group, and the upper chord member and the first welded portion group are welded to each other. And a lattice beam formed by welding the lower chord member and the second welding portion group.