JPH06280339A - Floor slab composed of pc board - Google Patents

Abstract

PURPOSE:To transform each PC board into a two directional load carrying board, and concurrently secure the in-place rigidity of a floor slab by letting each beam is so constituted as to be subjected to load applied to the floor slab when the floor slab is formed out of a plurality of PC boards which are bridged between the beams. CONSTITUTION:Each PC board 2 constituting a floor slab, both the ends in the longer direction of which are supported by beams 3, is prestressed by high strength wires 4 arranged in the width direction of the aforesaid board so as to be integrated. And a floor slab 1 composed of the PC boards 2 is fixed onto the beams 5 located in the width direction of each PC board 2 with both the ends of each high strength wire 4 fixed. Furthermore, the floor slab 1 allows its vertical load to be transmitted to the beams 3 at both the end sections in the longer direction of each PC board, and to the beams 5 at both the ends in the width direction of each PC board 2 by means of each PC board 2 itself and each high strength wire 4, and also allows in-place rigidity to be secured by the high strength wires 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor slab in which a floor set is composed of a plurality of PC plates bridged between beams.

[0002]

2. Description of the Related Art Conventionally, this type of floor slab has a so-called one-way structure in which a plurality of PC plates whose longitudinal ends are supported by beams are bridged to form a floor surface. Plates are generally known.

[0003]

However, since the conventional floor slab described above is a unidirectional plate in which the beams support only both ends in the longitudinal direction of the PC plate, the load that each PC plate for slab construction should bear. Is only the vertical load applied to the slab, not the horizontal load.

When a vertical load is applied to this conventional floor slab, since each PC plate is a unidirectional plate, there are beams that receive this PC plate and beams that do not receive it. The beam will have different stress.

Further, when a horizontal load is applied to this conventional floor slab, in order to effectively transmit the load to the main structural parts, post-cast concrete or other components are provided to provide in-plane rigidity of the floor surface. Must be secured.

The present invention was devised in view of the above-mentioned circumstances, and an object thereof is that when a floor slab is composed of a plurality of PC plates, there are beams that receive stress applied to the floor slab and beams that do not receive stress. Therefore, it is an object of the present invention to provide a floor slab made of PC plates that can make each PC plate a bidirectional plate and can secure the in-plane rigidity of the floor surface formed by each PC plate.

[0007]

According to the present invention, a floor slab of a unidirectional plate composed of a plurality of PC plates installed by supporting both ends in the longitudinal direction by beams is provided on site.
By connecting and integrating the respective PC plates in the width direction as well, the bidirectional plate is supported not only at both ends in the longitudinal direction but also at both ends in the width direction by the beams.

Due to such a constitution, even if the floor slab of the present invention is constituted by a plurality of PC plates which can be easily installed, the stress applied to the floor slab by the vertical load such as the loading load and its own weight, It is possible to disperse and transmit the beams to the beams on all four sides. Therefore, in the floor slab of the present invention, it is possible to make the stress transmitted to each beam on the four circumferences of the floor slab uniform, and to reliably maintain the structural strength.

The PC plates are connected to each other in the width direction to be integrated by inserting a PC steel material (stranded wire, steel rod), which is a high-strength steel wire, in the width direction of each PC plate. By introducing an axial force into the steel material by the post-tension method, the PC plates are clamped to each other and the tension is applied.

Further, the floor slab made of the PC plate of the present invention can be exerted against a horizontal load by arranging the high strength steel wire, which integrates the PC plates, in a downward convex curved line shape. It is also possible to secure the in-plane rigidity of the floor slab.

[0011]

EXAMPLES A floor slab made of a PC plate of the present invention will be described below with reference to the illustrated examples.

The floor slab 1 (see FIG. 1) is obtained by fixing a plurality of PC plates 2 to the beams 3 at both ends in the longitudinal direction.
It is constructed by spanning the beams. Further, each of the PC plates 2 is integrated by introducing prestress by the high strength steel wire 4 penetrating in the width direction, and the floor slab 1 constituted by each of the PC plates 2 has a high strength. By fixing both ends of the strength steel wire 4, it is fixed to the beam 5 positioned in the width direction of each PC plate 2.

The floor slab 1 composed of each PC plate 2 is subjected to a vertical load by the PC plate 2 itself and the high strength steel wire 4 at both end positions in the longitudinal direction of each PC plate 2. Can be transmitted to the beam 3 and the beams 5 at both ends in the width direction,
The high strength steel wire 4 can ensure in-plane rigidity.

The PC plate 2 in this embodiment is shown in FIG.
As shown in (b) and FIG. 6, it is formed in a substantially U-shaped cross section with rib portions 2a provided at both ends in the width direction, and
A PC steel rod 2b is arranged inside the rib portion 2a by pretensioning. In addition, as the shape of this PC plate,
In addition to the shape shown in FIG. 6, as shown in FIG. 7, a plate having a thick plate having a hollow portion 6 extending in the longitudinal direction therein may be considered.

Further, as the construction of this floor slab, in addition to the construction shown in FIG. 1 (b) and FIGS. 3 and 4, as shown in FIG. Placed in-place concrete 7 and composited with this concrete 7. Alternatively, as shown in FIG. 9, it is conceivable that the hollow portion 8 is formed by casting the cast-in-place concrete 7 on the upper surface of the rib portion 2a.

As described above, the floor slab 1 made of the PC plate 2 of the present invention is composed by combining the precast member of the PC plate 2 with the precast member of the PC plate 2 and the cast-in-place concrete 7. The structure is used.

In both of these methods, the PC steel material (PC steel rod, PC steel rod,
Strands are provided, and prestress is introduced into each PC plate 2 by the post tension method.

The floor slab 1 composed of the PC plate 2 having the above-mentioned structure is constructed as follows.

First, the PC plate 2 is bridged between the beams by fixing both ends in the longitudinal direction to the beams 3. By repeating this bridging work, as shown in FIG. 1 (a), the PC plates 2 of the precast members are laid out.

Next, a PC steel material, which is a high-strength steel wire 4 that has been subjected to anticorrosion treatment, is arranged in the width direction of each PC plate 2. At this time, the PC steel material which is the high strength steel wire 4 is as shown in FIGS.
As shown in FIG. 1, the post-tensioning sheath 9 is arranged in the width direction of each PC plate 2, and not only a straight line but also a downwardly convex curved line as shown in FIG. To be arranged in a shape.

The PC steel material for post tension, which is the high-strength steel wire 4, is arranged in the shape of a curved line convex downward so that the PC plate 2 is laid across the beam 3 in the longitudinal direction. This is to disperse the vertical stress in the width direction. At this time, the design stress is designed to be received by the high strength steel wire 4.

Next, the PC steel material which is the high strength steel wire 4 arranged in the width direction of each PC plate 2 is tensioned. At the time of this tension, each PC plate 2 is pre-stressed by the high-strength steel wire 4 penetrating in its width direction, and the in-plane rigidity of the floor surface can be ensured and integrated.

After this tension, both ends of the high strength steel wire 4 are fixed to the beams 5 located in the width direction of each PC plate 2. The fixing of the high strength steel wire 4 to the beam 5 at both ends is as shown in FIG.
And as shown in FIG. 4, it is performed by placing the post-cast concrete 10. Also, this post-cast concrete
Due to 10, the PC plates 2 and the beams 5 located in the width direction thereof are completely integrated and tightly connected.

Next, each P in the width direction of each PC plate 2
As shown in FIG. 2, the joints 11 between the C plates 2 are filled with mortar and the like and cured, so that the construction of the floor slab 1 is completed.

In such a floor slab 1, in-plane rigidity can be sufficiently exerted by the in-plane compression force generated by the tension force of the PC steel material which is the high strength steel wire 4.

In order to integrate the respective PC plates 2 into a bidirectional floor slab, as in the above-mentioned embodiment, when installing one by one on the beam and performing post tension on the beam. Then, it is conceivable that the PC slabs 2 are laid on the ground and post-tensioned to be installed on the beams while forming a bidirectional floor slab.

Further, each PC plate 2 does not become a bidirectional plate only by tightening each other by the post tension method. Therefore, the wiring method, the tension force, the fixing method, and the compressive stress degree of the rib portion 2a of the PC steel material which is the high strength steel wire 4 are controlled so as to form a bidirectional plate.

[0028]

According to the floor slab of the present invention, the high strength steel wire tightens the respective PC plates in the width direction,
Due to the tension, each PC version is integrated,
The beams at the longitudinal position of each PC plate and the beams at the widthwise position of each PC plate are supported.

Therefore, even if the floor slab is composed of a plurality of PC slabs that are easy to install, the stress applied to the floor slab by vertical loads such as the loading load and its own weight is dispersed and transmitted to the beams on the four circumferences. You can

Therefore, in the floor slab of the present invention, it is possible to make the stress transmitted to each beam of the four circumferences of the floor slab uniform, and even if the floor slab is composed of a plurality of PC plates, special treatment is required. It is possible to reliably maintain the structural strength.

Further, by introducing an axial force by the post-tension method, the PC plates in the width direction are clamped to each other, and the high strength steel wire which integrates the PC plates by the tension force is projected downward. By arranging in a curved line shape, it is possible to secure in-plane rigidity of the floor slab that is exerted against a horizontal load.

[Brief description of drawings]

1A is a schematic plan view showing a floor slab of the present invention, and FIG. 1B is a sectional view taken along line AA of FIG.

FIG. 2 is an enlarged sectional view of a B part in FIG. 1 (b).

FIG. 3 is an enlarged sectional view of a C portion in FIG. 1 (b).

FIG. 4 is an enlarged sectional view of a D part in FIG. 1 (b).

5 is a cross-sectional view taken along the line EE of FIG.

FIG. 6 is a schematic view showing a PC plate in the floor slab of the present invention.

FIG. 7 is a schematic view showing another embodiment of the PC plate in the floor slab of the present invention.

FIG. 8 is a schematic view showing another embodiment of the structure of the floor slab of the present invention.

FIG. 9 is a schematic view showing still another aspect of the structure of the floor slab of the present invention.

FIG. 10 is a schematic view showing another embodiment of a state where the floor slab of the present invention is housed in a beam.

[Explanation of Codes] 1 ... Floor slab, 2 ... PC plate, 2a ... Rib part, 2b ... PC steel rod, 3 ... Beam, 4 ... High strength steel wire, 5 ... Beam, 6 ... Hollow part,
7 ... cast-in-place concrete, 8 ... hollow part, 9 ... sheath for post tension, 10 ... post-cast concrete, 11 ... joint.

Claims (1)

[Claims] 1. A floor slab configured by bridging a plurality of PC plates by fixing both ends in the longitudinal direction to the beams, wherein each PC plate penetrates in the width direction. Prestress is introduced by the high-strength steel wire and integrated, and the floor slab composed of each PC plate is fixed by fixing both ends of the high-strength steel wire. The floor slab, which is fixed to the beam positioned in the width direction and is composed of each of the PC plates, applies the vertical load to each PC plate by the PC plate itself and the high-strength steel wire.
A floor slab made of a PC plate, which can be transmitted to the beams at both ends in the longitudinal direction and the beams at both ends in the width direction of the plate, and can also secure in-plane rigidity by the high strength steel wire.