JPH0629312Y2 - Space truss beam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a space truss beam using a rectangular steel tube.

[Problems to be solved by the invention]

Generally, truss beams are often formed of shaped steel for convenience of construction such as processing and joining of members, but there is a limit in strength due to directional cross-sectional performance, and it is necessary to put a reinforcing material in an appropriate place.

Therefore, if a rectangular steel pipe with no directivity is used, if the lattice material is butt-joined to the side surface of the chord material and joined, there is a possibility that obstacles such as punching damage to the chord material when the lattice material is tensioned and depression when the lattice material is compressed. is there.

The present invention was made in consideration of the actual situation of such a conventional truss beam, and it is intended to eliminate the following inconveniences by connecting the lattice members and the upper and lower chord members so that the ridge lines of the corners are continuous.

[Means for solving problems]

In this invention, the truss beam is a three-dimensional truss made of square steel pipe, and by connecting so that the ridge lines of the corners of the lattice members and the upper and lower chord members are continuous, the strength of the joint is increased and special reinforcing means is unnecessary. Also, it is possible to prevent deformation and destruction of members.

A three-dimensional truss beam is formed by laying a lattice material between two upper chord members and one lower chord member. The chord members are arranged such that the side surfaces are horizontal and the vertical direction. The ridge lines of the corners of are connected so as to be continuous. That is, the corners of the upper and lower chord members and the lattice member, that is, the ridge lines of both members are continuous.

As a result of the above connection, the axial force of the lattice member becomes a component force in the in-plane direction of the chord member, so that the force is reliably transmitted from the lattice member to the chord member and the contact length between the members increases. Therefore, the strength of the joint is increased.

〔Example〕

The present invention will be described below with reference to the drawings showing an embodiment.

As shown in FIG. 1, the three-dimensional truss beam A of this invention has two upper chord members 1, 1 of a rectangular steel tube, one lower chord member 2 and a lattice member 3.
It is composed of and.

The upper chords 1 and 1 and the lower chord 2 have horizontal sides as shown in the figure,
They are arranged in a vertical direction and are located on the extension lines of the diagonal lines of the cross sections.

As shown in FIG. 4, the lattice member 3 is connected to the corner portions of the upper chord member 1 and the lower chord member 2 so that their ridge lines are continuous.

2 is a side view of the space truss beam A, and FIG. 3 is X- in FIG.
As shown in FIG. 4, the lattice member 3 is joined to the corners of the upper and lower strings 1 and 2 with its side surface rotated about 45 ° about its centroid axis as shown in FIG. The ridge lines of the chord members 1 and 2 and the lattice member 3 are continuous.

FIG. 4 shows an embodiment in which the three-dimensional truss beam A is made into a composite beam as a construction example of the present invention.

In this embodiment, the deck plate 4 is laid on the space truss beam A and the concrete 5 is placed. However, since the upper surface of the upper chord member 1 is a horizontal plane, the deck plate 4 is installed.
It is possible to easily join the stud dowels 6.

Further, as shown in the drawing, PC steel material 7 is put in the lower chord material 2 side as necessary in order to reduce the amount of steel material and prevent bending, but in that case, the PC steel material 7 is stored inside the rectangular steel pipe. Can be protected.

[Effect of device]

The present invention is as described above, and by connecting the lattice members so that the ridge lines of the corners of the upper and lower chord members are continuous, the axial force of the lattice members is transmitted to the chord members as its in-plane force. At the same time that the force is transmitted securely, the joint length of both members is large, so that the strength of the joint portion is improved, and the structure such that the deformation and breakage of the chord member are effectively prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing an assembly example of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a sectional view taken along line XX of FIG. 4, and FIG. FIG. A ... Three-dimensional truss beam, 1 ... Upper chord material, 2 ... Lower chord material, 3 ... Lattice material, 4 ... Deck plate, 5 ... Concrete, 6 ... Stud dowel, 7 ... PC steel material.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A space truss beam comprising a rectangular steel pipe and a lattice member that forms a space truss between two upper chord members which are rectangular steel pipes and one lower chord member. A three-dimensional truss beam, in which timbers are connected so that the ridgelines of the corners of the upper and lower chords and lattices are continuous.