JPH04254644A - Structure joining floor slab with beam member - Google Patents

Abstract

PURPOSE:To enhance effect of reinforcement by letting a floor slab be composed of pre-cast plates at the bottom section which commonly act as forms, and of a concrete section located above the aforesaid plate, and thereby integrating a beam body which is built by reinforcing bars but contains no steel frame, with the floor slab. CONSTITUTION:A beam body made up of reinforcing bars, in which main reinforcements 8, a stirrup 9 and the like are formed into a prism shape, is fixed onto a column made up of steel frames, and a form 17 is fitted thereon. In addition, pre-cast plates 3 commonly acting as forms, are also fitted thereon, and a slab lower reinforcement 6 and a slab upper reinforcement 5 are disposed therein. Furthermore, a reinforcement 10 in a comb shape is inserted therein from above so as to be fixed with stranded wires and the like, and concrete is then poured therein, so that a beam member 2 is integrally formed with a floor slab 1. And each end peripheral section 12 of the pre-cast plates 3 is made to cut into the beam member 2, so that the surface A is thereby prevented from being lowered in strength as much as possible.

Description

[Detailed description of the invention]

0001

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

0002

[Prior Art] Generally, a beam member is constructed by placing a plurality of reinforcing bars around a steel frame in parallel with the steel frame and using stirrups and binding wires.
It is obtained by bundling into a prismatic shape to form a beam, building a formwork around it, and pouring concrete. However, in that case, a steel frame is required, which tends to increase the cost (particularly when the load-bearing wall is on the lower side, the strength tends to be excessive), and the workability is low. As a countermeasure to this problem, it is possible to form the beam body only with reinforcing bars, but in that case, stress will be concentrated at the connection part with the floor slab, especially at the part of the beam member that is at the same level as the bottom surface of the floor slab. This becomes more noticeable when a precast concrete board is built into the bottom of the container.

0003

[Purpose of the invention] The present invention is capable of achieving the same level of strength within the beam member as the bottom surface of the floor slab when the beam body is constructed of only reinforcing bars (eliminating the steel frame) and a precast board is built into the bottom of the floor slab. It is intended to be easily expandable.

0004

[Structure of the Invention] In the first invention, at the joint between the floor slab and the beam member, the floor slab is formed of a bottom precast plate that also serves as a formwork and a concrete portion above it, and the beam member is connected to the upper two corners. main reinforcing bars at at least four corners that occupy a higher position than the precast board, stirrups surrounding the four main bars, and main bars that hang down in the longitudinal direction from between the main bars at the top two corners to the center of the beam member, which is lower than the precast board. It is characterized by a large number of reinforcing bars arranged parallel to each other with a distance between them, and a concrete part containing these reinforcing bars, which are integrally formed with the floor slab, and the edge of the precast board is inserted into the beam member. This is a connection structure between a floor slab and a beam member.

[0005] The second invention includes a large number of horizontal reinforcing bars in which the reinforcing bars are orthogonal to the main reinforcing bars, vertical reinforcing bars that hang down from one end 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 reinforcing bars. 2. A connecting structure between a floor slab and a beam member according to claim 1, comprising a strut.

[0006]

[Example] 1 in Fig. 1 is a floor slab for forming the floor of the second floor of a building, 2 is a beam member for reinforcing the floor, and the lower side of the beam member 2 is a load-bearing wall (Fig. (not shown) may also occur. The floor slab 1 consists of a precast board 3 that also serves as a formwork at the bottom, a concrete section 4 above it, and a concrete section 4.
Slab upper reinforcement 5 and slab lower reinforcement 6 embedded in the top portion 4
The slab lower reinforcement 6 passes through the inside of the beam member 2, and both ends thereof each extend upward of the precast board 3 by at least the same width as the beam member 2.

The beam member 2 has main bars 8 made of thick reinforcing bars at the four corners,
The stirrup 9 is made up of a large number of substantially square stirrups 9 surrounding the main reinforcement 8, reinforcing bars 10 made of slightly thinner steel, and a concrete section 11 containing these. They are arranged at regular intervals and fixed to the main reinforcing bars 8 with binding wires. The end edge 12 of the precast board 3 should be deep within the beam member 2 (for example, 50 m) within the range that does not hit the stirrup 9.
m) It penetrates and is integrated with the concrete part 11.

As shown in FIG. 2, the reinforcing bars 10 have an inverted U shape with vertical reinforcing bars 15 hanging from both ends of horizontal reinforcing bars 14 made of reinforcing bars.
Welded to the lower surface of a connecting bar 16 made of reinforcing bars that is perpendicular to the horizontal reinforcing bar 14 at the center of the horizontal reinforcing bar 14, the connecting bar 16 is parallel to the main bar 8 and is attached to the slab top reinforcement 5.
It hangs down to the center of the beam member 2 in a comb shape from the middle of the upper two main reinforcements 8, 8 located at a slightly higher position than the precast board 3. In FIG. 1, the width of the reinforcing bar 10 is slightly larger than the distance between the reinforcing bar 10 and the stirrup 9,
In cooperation with the stirrup 9, it contributes to improving the strength of the surface A at the same level as the lower surface of the precast board 3. When auxiliary main reinforcements 8a are arranged between the upper two main reinforcements 8, 8, the horizontal reinforcing bars 14 are supported on these auxiliary main reinforcements 8a. As shown in FIG. 3, the reinforcing bars 10 may have one vertical reinforcing bar 15, or may have separate reinforcing bars 16 without connecting bars 16.

[0009] In the manufacturing process, the main reinforcing bars 8
, Stirrups 9 and the like are assembled into a prismatic shape to form a beam made of reinforcing bars, which is then fixed to a steel column, a formwork 17 is attached, and at the same time a precast plate 3 that also serves as the formwork is attached, and the slab lower reinforcement is installed. 6. Arrange the slab upper reinforcement 5, then insert the comb-shaped reinforcement 10 from above and fix it with binding wire or the like, and then pour concrete to form the beam member 2 and the floor slab 1. The load applied to the floor slab 1 is supported by the floor slab 1 reinforced by the beam members 2.

0010

According to the present invention, the reinforcing bars 10 pass between the adjacent end edges 12, 12 of the precast board 3 to form the upper part 2.
Since a large number of main reinforcements 8 are arranged at intervals in the longitudinal direction of the main reinforcements 8, which hang down from between the corner main reinforcements 8, 8 to the center of the beam member 2,
The strength of side A, where the stress is most concentrated, is significantly increased, making it possible to use a beam made of reinforcing bars without a built-in steel frame. Moreover, since the end edge 12 of the precast board 3 is wedged into the beam member 2, the width of the surface A, which is subject to severe stress, is reduced, and reinforcing bars are added to the connection between the precast board end 12 and the beam member 2. There is an advantage that the ten combinations work effectively to prevent a decrease in the strength of the A-side portion as much as possible. When the reinforcing bars 10 are connected in an integrated comb shape by the connecting bars 16, assembly becomes easy and the positions are determined accurately, so that the reinforcing effect is not partially insufficient.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view.

FIG. 2 is a perspective view of reinforcing bars.

FIG. 3 is a perspective view of another reinforcement.

[Explanation of symbols]

1 Floor slab 2 Beam members 3 Precast board 4 Concrete part 8　　　　　　　　　Main lines 9 Stirrup 10 Reinforcement bars 11 Concrete part 12 End edge 14 Horizontal reinforcement 15 Vertical reinforcement 16 Connecting bars

Claims (2)

[Claims] Claim 1: At the connection part between the floor slab and the beam member, the floor slab is formed of a bottom precast board that also serves as a formwork and a concrete part above it, and the beam member is formed so that the upper two corners are made from the precast board. Main bars made of steel at at least four corners occupying high positions, stirrups surrounding the four main bars, and main bars hanging down from between the main bars at the top two corners to the center of the beam member lower than the precast board, separating the longitudinal intervals of the main bars. A floor slab is formed integrally with a floor slab by a large number of reinforcing bars arranged in parallel and a concrete part containing these bars, and the edge part of the precast board is inserted into the beam member. Connection structure of beam members. Claim 2: The reinforcement consists of a large number of horizontal reinforcement bars that are orthogonal to the main reinforcement, vertical reinforcement bars that hang down from one or both ends of each horizontal reinforcement, and connecting bars that are fixed to each horizontal reinforcement and extend parallel to the main reinforcement. The floor slab and beam member connection structure according to claim 1.