JPH0458534B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for constructing roof and floor slabs using steel structures.

``Prior Art'' The roof and floor slabs of medium-sized steel frame structures are generally constructed using H-beams or prefabricated beams.

``Problems to be solved by the invention'' However, in the case of shaped steel, the amount of steel material increases to ensure the specified strength, and in the case of assembled beams, although the amount of steel material decreases, the unit processing cost increases. There are drawbacks.

``Means for Solving the Problems'' and ``Operations'' The present invention was made in view of the above circumstances, and its gist is that a predetermined number of plates are attached to the lower ends of the girder steel frames installed between the columns. An attached bundle is hung vertically, and the bundle is received by connecting the lower chord or lattice tension material fixed at both ends to the plate, and the vertical load transmitted through the bundle is absorbed by the lower chord or lattice tension member. While converting the axial force carried by the columns through the beam members, we also assume that the small beam steel frames that are parallel or orthogonal to the large beam steel frames are supported by diagonal members extending from the plate. The present invention provides a hanging umbrella-type truss for steel frame structures that achieves a reduction in the amount of steel material and processing cost through rational stress-bearing treatment in which the load is borne by the column through the lower chord or lattice tension material. It is in.

"Example" This will be explained in detail below based on the drawings.

Fig. 1 a, b, c and Fig. 2 a, b, c are respectively a top view of the frame, a beam plan view, and a plan view of the frame in each embodiment of the present invention.
It is a beam-like side view.

In the figure, 1 is the pillar, 2 is the girder installed between the pillars,
Both are made of steel frame materials.

Reference numeral 3 denotes a bundle that is provided at several locations on the lower surface of the large beam 2 (in the illustrated example, one location in the center) and has a plate 7 integrated at its lower end, and is made of a material that is resistant to compression.

Reference numeral 4 denotes a lower chord tension member for the main beam 2, which is fixed at both ends to the pillar 1, etc., and is made of a material that is strong in tension, and is connected to the plate 7.

Although not shown in the drawings, if several bundles 3 are provided, in addition to connecting each bundle with the lower chord tension material mentioned above, it is also assumed that the bundles are held by lattice tension material provided between the bundles. , aiming to perfect the receiving structure using stencil material.

In the case of the above-mentioned planar frame structure, the vertical load is converted into axial force along the route of the bundle 3 → lower chord tension member 4 → column 1a, resulting in rational stress treatment.

The anti-buckling treatment for the planar frame described above is as follows.

In other words, 5 in the figure is a small beam steel frame, but this is the case when one is placed parallel to the main beam 2 (Fig. 1)
There are cases where it is arranged perpendicularly to the girder 2 (Fig. 2).

A diagonal member 6 extends symmetrically from the receiving portion to the small beam steel frame 5 to support it.

Therefore, the diagonal member 6 is made of a material that is resistant to compression.

With the configuration described above, the small beam steel frame 5 is buckled and reinforced, and the stress collected from the diagonal members 6 is rationally borne by the large beam provided with tension members, forming a hanging umbrella-type truss.

"Effects of the Invention" As described above, the present invention has an extremely simple frame structure and rational stress treatment, so the amount of steel for the beams is small, and
The unit processing cost is lower than that of assembled beams.

In addition, when the lower surface of the frame is exposed, if the lighting is arranged along each tension member and diagonal member, it will become symmetrical and radial, which is very suitable in terms of lighting design.

[Brief explanation of the drawing]

FIG. 1 and FIGS. 2a, b, and c are a top view, a beam-shaped plan view, and a beam-shaped side view of the frame of an embodiment of the present invention. 1...Column, 2...Major beam, 3...Bundle, 4...Bottom chord tension, 5...Small beam steel frame, 6...Diagonal member, 7
……plate.

Claims (1)

[Claims] 1. A bundle with attached plates is suspended from the bottom surface of the girder steel frame installed between the columns at the lower ends of a predetermined number, and the bundle is received by the lower chord tension material fixed at both ends of the column by joining to the plate. , while converting the axial force in which the vertical load transmitted through the bundle is carried by the column via the lower chord tension member, the small beam steel frame parallel or orthogonal to the large beam steel frame is transferred from the plate to the diagonal member extending from the plate. A method for constructing a floor slab using a hanging umbrella-type truss in a steel structure, characterized in that the load on the small beam steel frame is similarly supported by the column via the lower chord tension material.