JP2002004474A - Beam structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beam structure capable of developing an excellent structural performance against a shearing force even when a steel plate concrete structure is adopted. SOLUTION: Bolts 17 and 17 are fixed so as to project upward from the upper end parts of H-steels 14 and 14 forming both side faces 11b and 11b, a platy member 19 is installed between the bolts 17 and 17 so as to extend in the horizontal direction orthogonal to the material axial direction, and the bolts 17 and 17 and platy member 19 are buried in a concrete slab 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam structure integrally formed on a lower surface of a concrete slab to support the concrete slab.

[0002]

2. Description of the Related Art As is well known, a beam structure of a reinforced concrete (RC) structure is most often used as this type of beam structure.

[0003]

Incidentally, a steel plate concrete (SC) structure has attracted attention in recent years as a structure capable of greatly shortening the construction period and reducing costs as compared with a reinforced concrete structure. In particular, when a floor SC having a half SC structure in which the lower surface is formed of a steel plate and concrete is cast on the upper surface thereof is employed, from the viewpoint of the continuity of the concrete, it is desirable that the beam that engages with the half SC structure is also a half SC structure. .

FIGS. 3 and 4 show examples of a beam structure having such a half SC structure. The beam structure 1 shown in FIG. 3 has a lower surface 1a and both side surfaces 1b, 1b formed of steel plates 2, 3 when viewed from a material axis direction (a direction orthogonal to the paper surface).
The concrete C is filled in the area S1 surrounded by the steel plates 2 and 3. Further, the beam structure 4 shown in FIG. 4 is an example in which the H-shaped steel 5 is disposed on both side surfaces 4b, 4b of the beam structure 1 shown in FIG.

[0005] In these beam structures 1 and 4, since their cross sections are not completely constrained by steel plates, structural performance against shearing becomes a problem. For shearing, as shown in FIG. 3, a method of inserting an inverted U-shaped reinforcing bar 6 can be considered, but since such a reinforcing bar 6 is not directly joined to the steel plate 3, the transmission of force is not possible. It is performed through the concrete C, and there is a possibility that a problem in structural performance occurs. Further, when the beam size is small, there is a possibility that a reinforcing bar length that can transmit a force cannot be secured. Further, in the beam structure 4 shown in FIG. 4, both side surfaces 4 b, 4
There is a possibility that the clearance between the web 5b, which is the steel plate constituting the member b, and the reinforcing bar 6 becomes large, and the force cannot be sufficiently transmitted.

The present invention has been made in view of such circumstances, and has a beam structure capable of exhibiting good structural performance against shearing force even when a steel plate concrete structure is employed. The task is to provide.

[0007]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is,
The invention according to claim 1 is a beam structure for supporting a concrete slab, wherein the lower surface and both side surfaces are formed of steel plates when viewed from the axial direction of the material, and are formed in a region surrounded by the steel plates. Concrete is filled, and a protruding member is fixed so as to protrude upward from an upper end portion of the steel plate constituting the both side surfaces, and extends between these protruding members in a horizontal direction orthogonal to the material axis direction. The projecting member and the bridge member are buried in the concrete slab.

With this configuration, the projecting member and the bridge member can be fixed to the steel plate and can function as a shear reinforcing member.

According to a second aspect of the present invention, there is provided the beam structure according to the first aspect, wherein the projecting member is formed by a bolt and is welded to an upper end portion of the steel plate forming the both side surfaces. Is fixed to the upper end portion of the steel plate by being screwed into the steel plate.

[0010] With this configuration, the protruding member can be easily fixed.

According to a third aspect of the present invention, in the beam structure according to the second aspect, the bridging member is formed of a plate-like member having holes at both ends thereof. Along with the bolt being inserted in the part,
It is characterized by being fixed to the bolt by a fixing nut screwed to the bolt.

With this configuration, the bridge member can be easily fixed to the projecting member.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing a beam structure 11 according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line II in FIG. 1 when the beam structure 11 is viewed from the direction of the material axis.

This beam structure 11 is for supporting a concrete slab 12 having a half SC structure, and as shown in the drawing, a lower surface 11a is formed of a steel plate 13 and both side surfaces 11b are formed as shown in FIG. It is constituted by a web 14 a of the H-section steel 14. And these steel plates 1
The concrete C is filled in a region S2 surrounded by the H-shaped steel 3 and the H-shaped steel 14. The concrete C is cast integrally with the concrete C located above the steel plate 15 constituting the concrete slab 12.

The steel plate 13 has a configuration in which both side edges 13a, 13a are placed and fixed on a lower flange 14b of an H-shaped steel 14. Further, the steel plate 13 and the H-shaped steel 14
The stud 1 is provided on the plate surface of the region 14
Are provided in a protruding state.

In this beam structure 11, bolts (projecting members) 17, 17,... Are provided so as to project upward from an upper flange 14c located at the upper end of the H-section steel 14. This bolt 17 is attached to the upper flange 14c.
Are fixed to the upper flange 14c by being screwed to welding nuts 18, 18,.

Further, both side surfaces 11b, 11b of the beam structure 11 are provided.
Between the bolts 17, 17 respectively fixed above the
A plate-like member (erection member) 19 is installed. The plate-like member 19 is formed of a steel plate, and is arranged in a horizontal direction (horizontal direction in FIG.
It is arranged so as to extend in the direction perpendicular to the plane of the paper of FIG. 2) and has holes 20 at both ends. Then, bolts 17, 17 are inserted into the holes 20, 20.
Are inserted, and the fixing nuts 21 and 21 screwed to the bolts 17 are arranged above and below the hole 20, whereby the plate member 19 is fixed from above and below.

In order to form such a beam structure 11, the studs 16, 16,...
The H-shaped steels 14, to which 8, 18,... Are fixed are arranged parallel to each other at the installation target positions of the beam structure 11. Next, the lower flanges 14b, 1 of these H-shaped steels 14, 14
4b, a steel plate 13 to which studs 16, 16,... Are similarly fixed is arranged in a predetermined direction.
Of both sides 13a, 13a of the lower flange 14b, 14b
Welded and fixed. Next, a bolt 17 is screwed onto each welding nut 18, thereby fixing the bolt 17 to the upper end of the H-section steel 14 and
Of the fixing nuts 21 and 21 are screwed down. Then, the plate-like member 19 is inserted into the holes 20, 20 with the bolt 17 inserted therein, and
The fixing nuts 21 and 21, which are located above the plate-like member 19, are screwed to the bolts 17 from above the plate-like member 19.

Further, the upper flange 14c of the H-section steel 14
A steel plate 15 constituting the concrete slab 12 is placed thereon and fixed by welding, and a reinforcing bar (not shown) serving as an upper end bar of the concrete slab 12 is arranged on the steel plate 15. Then, the structure as shown in FIGS. 1 and 2 is obtained by casting concrete C above the steel plate 15 and in the region S2.

In the above-described beam structure 11, bolts 17, 17 are fixed so as to protrude upward from the upper end of the H-shaped steel 14 constituting both side surfaces 11b, 11b, and between the bolts 17, 17. The plate member 19 is provided so as to extend in the horizontal direction perpendicular to the axial direction of the material, and the bolts 17, 17 and the plate member 19 are embedded in the concrete C constituting the concrete slab. In addition, the bolts 17, 17 and the plate member 19 can function as a shear reinforcement.
In this case, the bolt 17 and the plate-like member 19
4, the structural performance against the shearing force can be more favorably exhibited as compared with the related art.

In the beam structure 11 described above, the bolt 17 is fixed to the H-shaped steel 14 by being screwed to the welding nut 18 welded to the upper end of the H-shaped steel 14. In addition, the bolt 17 can be easily fixed to a desired position, and the workability is good.

Further, in the above-described beam structure 11, holes 20, 20 are formed at both ends of the plate-like member 19, and a bolt 17 is inserted into the hole 20. Fixing nuts 21 and 2
According to 1, since the plate-like member 19 is fixed to the bolt 17, the plate-like member 19 can be easily fixed to the bolt 17, and the workability is excellent.

In the above embodiment, other configurations may be adopted without departing from the spirit of the present invention. For example, in the above-described embodiment, the H-shaped steels 14 and 14 are disposed on both side surfaces 11b and 11b of the beam structure 11, however, steel plates may be used instead of the H-shaped steels 14 and 14. Further, the shape and material of the plate-like member 19 are not limited to those in the above-described embodiment, and a rod-like member may be used instead, or a material such as FRP may be used.

[0024]

As described above, according to the first aspect of the present invention, the projecting members are fixed so as to project upward from the upper end portions of the steel plates constituting both side surfaces of the beam structure, and these projecting members are formed. Between each other, an erecting member is provided so as to extend in a horizontal direction orthogonal to the material axis direction,
Since the projecting member and the erection member are embedded in the concrete slab, the projecting member and the erection member can be integrated to function as a shear reinforcement. In this case, since the projecting member and the erection member are fixed to the steel plates on both side surfaces of the beam structure, it is possible to exhibit the structural performance with respect to the shearing force better than before.

In the invention according to claim 2, a bolt is used as the projecting member, and the bolt is screwed to a welding nut welded to the upper end portion of the steel plate to be fixed to the steel plate. As a result, the projecting member can be easily fixed to the steel plate, and the workability is good.

According to the third aspect of the present invention, a plate-like member is used as a bridge member, and a bolt is inserted into holes formed at both ends of the plate-like member. Since the plate-shaped member is fixed to the bolt by the fixed nut, the plate-shaped member can be easily fixed to the bolt, and the workability is excellent.

[Brief description of the drawings]

FIG. 1 is an elevational sectional view of a beam structure schematically showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II in FIG.

FIG. 3 is an elevational sectional view of a beam structure of a conventional steel plate concrete structure.

FIG. 4 is an elevational sectional view showing another example of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Beam structure 11a Lower surface 11b Both side surfaces 12 Concrete slab 13 Steel plate 14 H-shaped steel 17 Bolt 18 Weld nut 19 Plate-like member (bridge member) 20 Hole 21 Fixed nut S2 area

Claims (3)

[Claims] 1. A beam structure for supporting a concrete slab, wherein a lower surface and both side surfaces are formed by steel plates when viewed from the axial direction of the material, and concrete is filled in a region surrounded by the steel plates. A protruding member is fixed so as to protrude upward from an upper end portion of the steel plate forming the both side surfaces, and extends between these protruding members in a horizontal direction orthogonal to the material axis direction. A beam structure, comprising: an erecting member, wherein the projecting member and the erecting member are embedded in the concrete slab. 2. The beam structure according to claim 1, wherein the projecting member is formed by a bolt, and is screwed to a welding nut welded to an upper end of a steel plate forming the both side surfaces. A beam structure fixed to an upper end portion of the steel plate by the above method. 3. The beam structure according to claim 2, wherein the bridging member is formed of a plate-like member having holes at both ends thereof, and the plate-like member inserts the bolt into the hole. A beam structure, wherein the beam structure is arranged in such a state as to be fixed to the bolt by a fixing nut screwed to the bolt.