JPH03176538A - Floor structure - Google Patents

Abstract

PURPOSE:To provide a floor structure of high rigity by a method in which the ends of PC plates having many cotters on upside and sides are placed on beams and concrete is placed to a concrete layer. CONSTITUTION:The floor structure is provided by supporting the ends of PC plates in horizontal state on beams 3a and by forming a concrete layer 8 on the place where no PC plates 14 are placed. The PC plate 14 is provided with cotters 9 on the upside 6 and recessed cotters 15 on sides 2 to form grooves at almost same intervals. Since many cotters 9 and 15 are formed on the upside 6 and sides 2 of the PC plate 14, shearing forces acting on the boundary between the upside 6 and sides 2 of the PC plate 14 and the layer 8 can be mutually transmitted and the plate 14 and the layer 8 can be integrated to make up a floor structure having high rigidity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floor structure formed by pouring concrete onto a PC board placed on a beam.

[Prior Art] Conventionally, the floor structure of a building generally consists of a beam, a PC board placed on the top surface of the beam, and a PC board placed on the PC board and on the beam.
Composite floor structures are widely used, consisting of a concrete layer poured into the areas where the boards are not placed.

In such a floor structure consisting of a beam, a PC board, and a concrete layer, structural integrity must be provided so that the horizontal shearing force acting on the interface between the top surface of the PC board and the concrete layer can be sufficiently transmitted to each other. For this reason, it has been conventional practice to previously form a large number of concave sockets on the upper surface of a PC board.

A conventional floor structure configured as described above will be explained with reference to the drawings.

As shown in FIG. 4, the conventional floor structure has a plurality of rectangular PCC 10 side surfaces 2, 2, . A PC board 111 is placed on the upper surface 4 of the beam 3a with an interval 5a between them.
The PC boards 1, ■, ... are supported in a horizontal state by placing the ends of the PC boards 1, ■, ... on the top surface 6 of the PCCs 10l, ... and the PC board l on the top surface 4 of the beam 3a. , 1, . . . , concrete is poured into the unmounted portions 7 to form a concrete layer 8.

As shown in FIG. 5, on the periphery of the top surface 6 of the PCC 10, a large number of bumps 9.9, .
The central portion IO becomes a flat surface L).

In general, the central portion IO is made a flat surface for the reason described later, but depending on the building, a structure in which the entire upper surface 6 of the PCC 10 is provided with grooves 9, 9, etc. may be used.

As shown in FIG. 6, the PCC 10 on the upper surface 4 of the steel beam 3a
In the part 7 that is not placed, there are studs and bolts ItS.
11,... (only two are shown in the figure) are welded, and these studs and bolts 11° + 1. ... joins the concrete layer 8 and the beam 3a at the interval 5a.

Moreover, the code a is the thickness of the floor plate made of PCC10 and the concrete layer 8, the code S is the thickness of the concrete layer 8, and the code C is the PCC10 thickness.

As shown in Fig. 7, in the case where a reinforced concrete beam 3b is used instead of the steel beam 3a, a plurality of stirrups 12 (only one is shown in Fig. 7) and a plurality of stirrups 12 (only one is shown in Fig. 7) are installed in the frame 3b. Muscle 12! The main beam reinforcements 13.13, . . . attached to 2, .
, . . . and beam main reinforcements 13, 13 connect the concrete layer 8 and the beam 3b at the interval 5b.

In addition, the top surface 6 of the PCC board is coated with a powder of 9.9
9.91.・
The reason for providing this is because the horizontal shearing force generated at the interface with the upper surface 6 of the PCC board and the concrete layer 8 is large at the periphery and small at the center IO, so it is sufficient to provide it only at the periphery. , 9, . . . in the central portion 10 where a large bending moment occurs would result in unnecessary cross-sectional defects and reduce the bending strength of the PCC 10.

Therefore, in the conventional floor structure described above, the cotter is 9.9,...
- Transmits horizontal shearing forces to each other at the interface between the upper surface 6 of the PCC 10 and the concrete layer 8, thereby achieving integration.

Note that the above-mentioned temporary PCs are often manufactured near construction sites in order to save time and effort for transportation.

[Problems to be Solved by the Invention] By the way, in the conventional floor structure as described above, the PCC10 concrete layer 8, which is integrated by means of cotters 9, 9,... To counter this. However, since the side surface 2 of the PCC 10 is a flat surface, the shear force along this interface cannot be mutually transmitted at the interface between the side surface 2 and the concrete layer 8. The shear strength against force was small. Therefore, when a force is applied along the plane of the floor,
The shear force generated in the cross section of the floor including the side surface 2 of the PCC 10 due to this force was counteracted by the shear strength of the concrete layer 8 covering the entire upper part of the floor including the boundary surface.

Therefore, when designing the floor of a building using a conventional floor structure, only the thickness b of the concrete layer 8 poured later is effective against the force along the floor surface, not the thickness a of the floor plate. It was supposed to have a strong strength.

In the above-mentioned conventional floor structure, there are many walls that act as load-bearing elements for the force along the floor surface, and there would be no problem if it were used as a floor for an HPC house or high-rise residence where the force along the floor surface is not so strong. . However, in the above-mentioned conventional floor structure, the floor area is large and there are few walls etc. that serve as the above-mentioned load-bearing elements. There was a problem in terms of rigidity.

For example, in the above conventional floor structure, the thickness a of the floor plate is 1
When designing a warehouse floor as 80mm, PCC1
0 thickness C is 120 mm, and the thickness b of concrete layer 8
was about 60mm. However, when this floor is considered as a warehouse floor with a large shearing force, due to the design,
Only the 60mm thick concrete layer 8, which is 1/3 of the thickness a of the floorboard, acts as a load-bearing element for the force along the floor surface, and the rigidity was insufficient for a warehouse floor that is subject to large shearing forces. .

Furthermore, since almost no mutual shearing force is transmitted at the interface between the concrete layer 8 and the side surface 2 of the PC board 1, displacement occurs at the interface when a force along the floor surface is applied. As a result, the concrete layer 8 could not withstand the shearing force, and cracks were likely to occur along the PC board.

In the above-mentioned conventional floor structure, the thickness of the floor plate cannot be made very thick due to the design, so in order to increase the resistance to the force along the surface of the floor without changing the thickness a of the floor plate, and to increase the rigidity of the floor. , it is conceivable to make the concrete layer 8 thicker and the PCC 10 thinner.

However, in order to make the PC board 1 thinner, it is necessary to increase the number of temporary supports or use a PC board containing PC steel rods, which increases the cost and complicates the work.

In addition, in order to increase the rigidity of the floor board without changing the thickness of the concrete layer 8, reinforcing bars protruding from the PC board I are installed so as to transmit shearing force to each other at the interface between the PCC board side surface 2 and the concrete layer 8. However, it is difficult to manufacture PC boards with protruding reinforcing bars near the construction site, and there are also construction problems, so it is not possible to actually use PC boards with protruding reinforcing bars as described above. It was difficult to install the floorboards.

This invention was made in view of the above-mentioned circumstances, and its purpose is to make the construction work less complicated than the above-mentioned conventional floor structure, and to make it possible to form it without increasing cost. Our goal is to provide a highly rigid floor structure that is possible.

[Means for Solving the Problems] The floor structure of the present invention has the ends of a plurality of PC boards placed on the upper surface of a beam to support these PC boards in a horizontal state.
In a floor structure in which a concrete layer is formed by pouring concrete on the top surface of the board and the top surface of the beam where the PC board is not placed, the concrete layer is formed on the top surface and side surfaces of the PC board. It is characterized by the formation of a large number of cotters to enhance integration with the

[Function] According to the above configuration, in the floor structure of the present invention, the PC
By forming a large number of cotters on the top and side surfaces of the board, the shearing force acting on the interface between the top surface of the PC board and the concrete layer and the shearing force acting on the interface between the side surface of the PC board and the concrete layer are mutually reduced. Because of the sufficient transmission, the PC board and concrete layer are integrated, resulting in a highly rigid floor structure.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

Figures 1 to 3 show the floor structure of the present invention, and in these figures, the same elements as those of the conventional technology shown in Figures 4 to 7 are designated by the same reference numerals. The explanation will be omitted.

As shown in FIGS. 1 and 2, the PC board 14 has an upper surface 6
Same as the conventional PCC10 mentioned above, Kotter 9.9,...
are formed, and a plurality of concave holders 15, I5, . . . are formed on the side surfaces 2.2, . . .
They are formed at intervals of approximately the same width as the... This Kotter 15.15... is PC board I4
The PC board 14 is a groove that is perpendicular to the sides of the PC board 14 and open at both ends, and when the PC board 14 is viewed from above, the sides are shaped like convex ridges with equal intervals.

As shown in FIG. 1, the floor structure using the above-mentioned PC board 14 has a plurality of P on the upper surface 4 of the beam 3a, similar to the above-mentioned conventional floor structure.
Place the ends of the C board 14 on these PC boards 14.14,
... is supported in a horizontal state, and the PC board 14.14, ...
PC board 14, I4 on the upper surface 6 and on the upper surface 4 of the beam 3a,
The concrete layer 8 is formed by pouring concrete into the portion 7 where the ... is not placed.

The only difference between the manufacturing method of the PC board 14 and the conventional manufacturing method of the PCC 10 is that a plurality of protrusions are provided at equal intervals inside the side surface of the formwork used when manufacturing the PC board.

FIG. 3 is a plan view of the floor structure.

As shown in FIG. 3, the distance 5a between the PC boards 14 and 14 is
In, the concave concrete cock-15,! 5,
...The PCCl2O 14 and the concrete layer 8 are integrated, and a third force is applied to the shearing force generated at the interface between the side surface 2.2 of the PCCl2O 14 and the concrete layer 8.
In the figure, the shear strength at part A, the shear strength at part 8, and the bearing pressure strength at part 0 are used to counteract each other.

As described above, in the above floor structure, shear force is transmitted at the interface between the PCCl2O upper surface and the concrete layer 8, and at the same time, shear force is transmitted at the interface between the side surface 2 of the PC board I4 and the concrete layer 8, The PCCl2O concrete layer 8 is integrated. Therefore, the rigidity of the floor plate of the above-mentioned floor structure is increased, and the floors of buildings such as warehouses and offices that have few load-bearing elements and which are subject to large forces along the floor surface can also be designed with the above-mentioned floor structure.

In addition, when constructing the floor of the above-mentioned floor structure, the difference in work from the construction of the floor of the conventional floor structure is that when manufacturing PCCl2O, a formwork with a convex part inside the side surface is used. There is no need to complicate the work or increase costs.

[Effects of the Invention] As explained above, according to the present invention, the ends of a plurality of PC boards are placed on the top surface of the beam, and the PC boards are placed on the top surface of these PC boards and the top surface of the katane. In a floor structure in which concrete is poured in areas where concrete is not placed and a concrete layer is formed, by forming a large number of bumpers on the top and side surfaces of the PC board, only the interface between the top surface of the PC board and the concrete layer is formed. Instead, shearing forces are transferred to each other at the interface between the PCC board and the concrete layer, and the PC board and concrete layer are integrated, increasing the rigidity of the floor and making it ideal for warehouses and offices. With the above floor structure, it is possible to design a building that has few load-bearing elements such as, and which is subjected to a large force along the floor surface.

In addition, the construction method for the floor of the above-mentioned floor structure is almost the same as that of the floor of the conventional floor structure, so when constructing the floor of the above-mentioned floor structure, compare it with the construction method of the floor of the conventional floor structure. This will not complicate the work or increase costs.

[Brief explanation of drawings]

1 to 3 are diagrams showing an embodiment of the present invention, in which FIG. 1 is a perspective sectional view of the main part showing the floor structure, and FIG. 2 is a P
FIG. 3 is a perspective view of the main part showing the C board, FIG. 3 is a plan view of the main part showing the floor structure, FIGS. 4 to 7 are diagrams showing the conventional technology, and FIG. 4 is the main part showing the floor structure. Perspective cross-sectional view, Figure 5 is PC
FIG. 6 is a sectional view of the main part showing the floor structure; FIG. 7 is a sectional view of the main part showing the floor structure.

Claims (1)

[Claims] By placing the ends of a plurality of PC boards on the upper surface of the beam,
In a floor structure in which a board is supported in a horizontal state and a concrete layer is formed by pouring concrete on the upper surface of the PC board and on the upper surface of the beam where the PC board is not placed, the above-mentioned A floor structure characterized in that a large number of cotters are formed on the top and side surfaces of a PC board to enhance integration with the concrete layer.