JPH11343700A - Composite girder using cut T steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a piping space by providing a plurality of through-holes for passing slab through bars on the upper end of the web of a cut T-steel, and fixing a receiving angle between the through-hole and the flange above the web. SOLUTION: In the web 21 of a cut T-steel product 2, a number of through- holes 22 for passing slab through bars are provided in a position lowered by a prescribed level from the top end 21B of the upper end part 21A of the web 21 at fixed intervals along the longitudinal direction of the web. A plurality of mounting holes 24 for bolting to a gazette plate provided on a girder is provided on both end parts 21C of the web 21 of the cut T-steel product 2. Further, a pair of receiving angles 3, 4 for receiving a deck plate is formed by use of an L-shaped sectional steel lengthy member, and the receiving angles 3, 4 are fixed onto the web 21 of the cut T-steel product 2 so as to be situated between the through-hole 22 and the flange 23. Accordingly, since the size of the composed small beam is minimized, the equipment piping space can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite beam using cut T-steel.

[0002]

2. Description of the Related Art In a conventional steel structure building, a small beam is bridged orthogonally between girders bridged between steel columns, and a load on the floor is received by the girders and transmitted to the girders. Has become.

[0003] A conventional small beam provided for such a purpose is made of H-shaped steel, receives a deck plate by a compression side flange thereof, and drives a plurality of stud bolts provided on the compression side flange into the deck plate. It is formed as a composite beam that is embedded in concrete and integrated with the slab.

[0004]

However, the composite beam has H
According to the conventional configuration using the shape steel, the beam structure becomes large and the piping space for the equipment cannot be taken, and therefore, there is a tendency that a problem arises that the ceiling height has to be reduced or the floor height has to be increased. . Further, when considered as a composite beam, the compression side (slab side) steel flange of the H-section steel does not work very effectively as a structural material, and a large number of stud bolts must be used, so it cannot be said that it is a reasonable structure. There is also a problem.

The object of the present invention is therefore to provide a cut T which can solve the above-mentioned problems in the prior art.
An object of the present invention is to provide a composite beam using steel.

[0006]

According to the present invention, there is provided, in accordance with the present invention, a plurality of through holes for penetrating slab through bars at an upper end portion of a web of cut T steel, and In addition, there is proposed a composite beam using a cut T steel material in which a receiving angle for receiving a deck plate is fixed between the through hole and the flange.

The composite beam can be bridged between the beams at right angles by means such as bolting each end of the cut T-steel web to a gusset plate fixed to the corresponding beam. The upper end of the web is integrated with the slab by casting concrete on the deck plate after passing the slab through the through hole at the upper end of the web that protrudes upward from the deck plate received at the receiving angle, and the upper end of the web is integrated with the slab as a composite beam. Function.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing an example of an embodiment of a composite beam using a cut T-steel material according to the present invention. The composite beam 1 has a pair of receiving angles 3 and 4 fixed to a web 21 of a cut T steel material 2 by welding, and a through hole 2 for allowing a slab through bar to penetrate an upper end 21A of the web 21.
2 is provided. In the present embodiment, the through holes 22 are provided at predetermined intervals along the longitudinal direction of the web 21 at positions lower than the top end 21B of the web 21 by a predetermined level.

A pair of receiving angles 3 and 4 for receiving the deck plate are fixed on the web 21 so as to be located between the through hole 22 and the flange 23. Each of the receiving angles 3 and 4 is a long member made of steel having an L-shaped cross section, and can receive a deck plate on each of the upper surfaces 3A and 4A of the receiving angles 3 and 4 (see FIG. 2). ).

One end 21 of the web 21 of the cut T steel material 2
C has a plurality of mounting holes 24 for bolting to a gusset plate (not shown) provided on the girder. Although not shown in FIG. 1, the other end of the web 21 is similarly provided with a mounting hole 24 for bolting to a gusset plate (not shown) provided on a corresponding girder. ing.

Next, with reference to FIG. 2, an example of a structure in which a slab is integrally formed using the composite beam 1 shown in FIG. 1 will be described.

The composite beam 1 is provided with a pair of large beams (not shown) by mounting holes 24 provided at each end of the web 21.
And one end edge 31A of the deck plate 31 is received by the receiving angle 3 and the other deck plate 3 is received by the receiving angle 4.
2 at one end edge 32A. Therefore, the through holes 22 formed in the upper end portion 21A of the web 21 are all formed on the upper surfaces 31B, 32B of the deck plates 31, 32.
It is located above.

Reference numeral 40 denotes a slab reinforcement assembled for constructing a reinforced concrete slab by cast-in-place on the deck plates 31 and 32. The slab reinforcement 41 passes through the through hole 22. Has been arranged. After the slab reinforcement 40 is formed on the deck plates 31 and 32, concrete is cast to form the reinforced concrete slab 50.

As can be seen from the above description, since the upper end 21A of the web 21 constituting the composite beam 1 is embedded in the reinforced concrete slab 50, the beam length of the composite beam 1 is reduced as compared with the conventional one. Can be. As a result, a space for equipment piping can be secured without reducing the ceiling height or increasing the floor height.

Further, according to the configuration of FIG. 2, since the reinforced concrete slab 50 bears the bending compression force applied to the composite beam 1 due to the load on the reinforced concrete slab 50, the cut T steel material 2 having no compression flange is sufficient. It can withstand and is extremely rational in structure. As described above, according to the composite beam 1, unnecessary steel materials are not used, so that the beam can be reduced in weight and cost can be reduced.

In this embodiment, the cut T steel 2
Since the slab thread 41 is passed through the through hole 22 provided in the upper end portion 21A of the web 21, the shear transmission by the dowel action of the slab thread 41 can be expected, and a special stud is provided. Thus, there is an advantage that it is not necessary to integrate with the reinforced concrete slab 50.

[0018]

According to the present invention, as described above, the composite beam can receive the deck plate by the receiving angle provided on the cut T steel web, and the upper end of the web can be inserted into the slab. Therefore, the beam length of the composite beam can be reduced. As a result, a space for equipment piping can be secured without reducing the ceiling height or increasing the floor height.

According to the composite beam according to the present invention, since the slab bears the bending compressive force given to the composite beam due to the load, the cut T-steel material having no compression flange can sufficiently withstand, and structurally. Since it is extremely rational and unnecessary steel is not used, it is possible to reduce the weight and cost of the small beams.

Further, since the slab is passed through the through hole provided in the cut T steel web,
Shear transmission can be expected due to the dowel action of the slab thread, and there is an advantage that there is no need to provide a special stud to integrate the slab with the slab.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a composite beam using a cut T steel material according to the present invention.

FIG. 2 is an explanatory diagram for explaining an example of a structure when a slab is constructed using the composite small beams shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Composite beam 2 Cut T steel material 3, 4 Receiving angle 21 Web 21A Upper end part 22 Through hole

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yosuke Fukumoto 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (1)

[Claims] An upper end of a web of cut T steel is provided with a plurality of through holes for penetrating a slab through bar, and for receiving a deck plate on the web and between the through hole and the flange. A composite beam using cut T steel, characterized by fixing the receiving angle of (1).