JPH07111071B2 - Connection structure of floor slab and beam members - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for a floor slab and a beam member in a concrete building.

[0002]

2. Description of the Related Art In general, a beam member has a plurality of reinforcing bars arranged in parallel with the steel frame around the steel frame and is made up of a stirrup and a binding wire.
It can be obtained by forming a beam by bundling into a prismatic shape, assembling a frame around it, and injecting concrete. However, in that case, since a steel frame is required, the cost tends to be high (especially when the bearing wall is on the lower side, the strength tends to be excessive) and the workability is low.
As a countermeasure to this, it is possible to form a beam body only with reinforcing bars, but in that case, stress concentrates on the connection part with the floor slab, especially the beam member part at the same level as the bottom surface of the floor slab, and this tendency tends to occur. It becomes remarkable when the precast concrete plate is built in the bottom of the.

[0003]

It is an object of the present invention to construct a beam body only with reinforcing bars (without steel frame), and when a precast plate is built in the bottom part of the floor slab, the strength of the beam member at the same level as the floor slab lower surface can be obtained. The purpose is to be able to easily increase.

According to a first aspect of the present invention, at a connecting portion between a floor slab and a beam member, the floor slab is formed of a bottom precast plate which also serves as a formwork and a concrete portion above the floor slab. Reinforcing bar main bars at least at four corners that occupy a position higher than the plate, a staple wrap that surrounds the above four main bars, and the distance between the main bars at the upper two corners to the center of the beam member lower than the precast plate. A floor characterized in that it is integrally formed with the floor slab by a large number of reinforcing bars arranged in parallel to each other and a concrete part containing these reinforcing bars, and the end edge of the precast plate enters the beam member. It is a connection structure of a slab and a beam member.

In a second aspect of the invention, a number of horizontal reinforcing bars having reinforcing bars orthogonal to the main bars, vertical reinforcing bars hanging down from one or both ends of each horizontal reinforcing bar, and a connection in which each horizontal reinforcing bar is fixed and extends parallel to the main bars. The floor slab and beam member connecting structure according to claim 1, which is composed of a streak.

[0006]

1 is a floor slab for forming a floor on the second floor of a building, and 2 is a beam member for reinforcing the floor. (Not shown) may come. The floor slab 1 includes a precast plate 3 which also serves as a formwork at the bottom, a concrete portion 4 on the upper side thereof, and a concrete
Upper slab muscle 5 and lower slab muscle 6 embedded in the toe part 4
The lower slab 6 penetrates the inside of the beam member 2, and both ends thereof extend above the precast plate 3 at least to the same extent as the width of the beam member 2.

The beam member 2 has main bars 8 made of thick rebar at four corners,
4 is composed of a large number of substantially quadrangular staple wraps 9 surrounding the main bars 8, a slightly thin reinforcing bar 10 and a concrete portion 11 containing these reinforcing bars. They are arranged at regular intervals and are fixed to the main bar 8 by a binding wire. The end edge portion 12 of the precast plate 3 is deep inside the beam member 2 (for example, 50 m) within the range where it does not contact the stapler 9.
m) Enters and is integrated with the concrete portion 11.

As shown in FIG. 2, the reinforcing bar 10 has an inverted U shape in which vertical reinforcing bars 15 hang down from both ends of a horizontal reinforcing bar 14 made of reinforcing steel.
A large number of main bodies of the shape are welded to the lower surface of the reinforcing bar connecting bar 16 orthogonal to the horizontal reinforcing bar 14 at the central portion of the horizontal reinforcing bar 14.
On the upper side of the precast plate 3 and hangs down in a comb shape from the middle portion of the upper two main bars 8, 8 located slightly higher than the precast plate 3 to the central portion of the beam member 2. In FIG. 1, the width of the reinforcing bar 10 is slightly larger than the distance between the reinforcing bar 10 and the stapler 9,
In cooperation with the stapler 9, it contributes to the improvement of the strength of the surface A at the same level as the lower surface of the precast plate 3. When the auxiliary main bar 8a is arranged between the upper two main bars 8, 8, the horizontal reinforcing bar 14 is supported on these auxiliary main bars 8a. The reinforcing bar 10 may be a single vertical reinforcing bar 15 as shown in FIG. 3 or may be a separate reinforcing bar without the connecting bar 16.

In the manufacturing process, the main bar 8, the staple wrap 9 and the like are assembled into a prism shape at another place in advance and formed into a beam body made of a reinforcing bar, which is fixed to the column made of a steel frame and the form 17 is attached. , At the same time, attach the precast plate 3 that also serves as a formwork,
The lower slab 6 and the upper slab 5 are arranged, and then the comb-like reinforcing bar 10 is inserted from above and fixed with a binding wire or the like, and then concrete is injected to form the beam member 2 and the floor slab 1. To do. The load applied to the floor slab 1 is supported by the floor slab 1 reinforced by the beam member 2.

[0010]

According to the present invention, the reinforcing bar 10 is passed between the adjacent edge portions 12, 12 of the precast plate 3 and the upper part 2
Since a large number hangs down from between the main bars 8 at the corners to the central portion of the beam member 2 and is arranged at intervals in the longitudinal direction of the main bars 8,
The strength of the A-side portion where the stress is most concentrated is significantly increased, and it becomes possible to use a rebar beam body that does not contain a steel frame. Moreover, since the edge portion 12 of the precast plate 3 is made to bite into the beam member 2, the width of the face A, which is stressed severely, is reduced, and the reinforcing bar is connected to the connection between the edge portion 12 of the precast plate and the beam member 2. There is an advantage that the combination of 10 can effectively act and prevent the strength reduction of the A surface portion as much as possible. When the reinforcing bar 10 is connected to the integral comb shape by the connecting bar 16, the assembly is facilitated, the position is accurately determined, and the reinforcing effect is not partially insufficient.

[Brief description of drawings]

FIG. 1 is a vertical sectional view.

FIG. 2 is a perspective view of a reinforcing bar.

FIG. 3 is a perspective view of another reinforcing bar.

[Explanation of symbols]

 1 Floor Slab 2 Beam Member 3 Precast Plate 4 Concrete Part 8 Main Bar 9 Star Wrap 10 Reinforcing Bar 11 Concrete Part 12 Edge Edge 14 Horizontal Reinforcing Bar 15 Vertical Reinforcing Bar 16 Connecting Bar

Claims (2)

[Claims] 1. In a connecting portion between a floor slab and a beam member, the floor slab is formed of a bottom precast plate which also serves as a formwork and a concrete portion thereon, and the beam member has two upper corners higher than the precast plate. Reinforcing bar main bars at least at four corners that occupy positions, a stapler wrapping the above four main bars, and a parallel line that hangs down between the main bars at the upper two corners to the center of the beam member that is lower than the precast plate. The floor slab and the beam, characterized in that a large number of reinforcing bars arranged in the floor and the concrete part containing them are integrally formed with the floor slab, and the edge of the precast plate is inserted into the beam member. Connection structure of members. 2. Reinforcement is composed of a number of horizontal reinforcements orthogonal to the main reinforcements, vertical reinforcements hanging from one or both ends of each horizontal reinforcement, and connecting reinforcements to which the horizontal reinforcements are fixed and extend parallel to the main reinforcement. The structure for connecting a floor slab and a beam member according to claim 1.