JP2698775B2 - How to build a void slab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a void slab in which a foam form is embedded in concrete.

[0002]

2. Description of the Related Art Conventionally, in a factory, as shown in FIG. 3, a rectangular preform concrete frame 50 (hereinafter, referred to as a thin PC board) having a rectangular parallelepiped shape made of a synthetic resin is provided on a thin precast concrete plate 50 at a predetermined interval. The slab substrate 53 is formed by providing a truss streak 52 on the side of the foaming mold 51, and as shown in FIGS. After forming the lower floor 55 by laying between the long beams 54, 54, an upper reinforcing bar 56 is arranged on the truss bar 52, and a cast-in-place concrete 57 is cast on the lower floor 55 to form a foam. A method of constructing a void slab that covers the frame 51 is known.

In the lower floor 55, the slab substrate 53 is
As shown in FIG. 5, one side of the slab substrate 53 located at both ends is placed on a short beam 58 orthogonal to the long beam 54. The long side direction of the foam mold 51 is oriented in a direction orthogonal to the long beam 54.

[0004] The void slab constructed as described above is
It can be considered as an aggregate of I-beams formed of concrete between the adjacent foaming forms 51. The structural calculation of this I-shaped beam is performed assuming that both ends are supported by the long beam 54.

[0005] Therefore, since the rigidity is high and a small beam is not required, there is an advantage that the plan of the interior of the dwelling unit is not restricted particularly when used in an apartment house.

Further, because of its excellent sound insulation, there is no need to provide a special sound insulation floor. Since the lower surface of the slab substrate 53 is a form surface of a thin PC board, the ceiling can be directly finished. Labor saving.

Further, since the slab substrate is manufactured at the factory, the quality is stabilized and the construction period on site can be shortened.

[0008]

However, in the above-described void slab construction method, although the formed slab is actually supported by a pair of long beams 54 and short beams 58 around the periphery, L perpendicular to the long beam 54
Since the slab must be designed as a one-way slab in which a load flows only in the _X direction, there are problems that the slab cannot be made too thin, and a part of the slab cannot be cut off due to piping or the like.

Therefore, the present invention relates to a 2
It is intended to provide a method for constructing a void slab that can be designed as a directional slab.

[0010]

In order to solve the above-mentioned problems, the present invention provides a slab substrate by fixing a large number of rectangular parallelepiped foam frames made of synthetic resin on a thin PC board at a predetermined interval. Is formed, and the slab substrate is laid at a predetermined position to form a lower floor supported by a pair of long beams and short beams, and then concrete is cast on the lower floor to cover the foaming formwork. In the method for constructing a void slab, the long side direction of the foaming form is directed in a direction perpendicular to the long beam at an intermediate portion in the longitudinal direction of the lower floor, and is directed in a direction perpendicular to the short beam at both ends.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In this construction method, first, 2
Various types of slab substrates 1 and 2 are manufactured. Slab substrates 1, 2
Is formed by fixing a large number of rectangular foamed frames 4 made of a synthetic resin on a thin PC board 3 at required intervals. The long side direction of the foam mold 4 is directed to the long side direction of the thin PC board 3 in the slab substrate 1, and the thin P
Orient in the short side direction of the C plate 3. In each of the slab substrates 1 and 2, a truss bar 5 is provided on the side of the foam form 4.

Next, the slab substrates 1 and 2 are carried into a required number of sites, respectively, and the slab substrates 1 and 2 are laid between a pair of long beams 6 to form a lower floor 7. At this time, three slab substrates 1 are arranged in parallel with the long sides of the slab substrates 1 and 2 oriented in a direction orthogonal to the long beams 6, and the slab substrates 2 are arranged on both sides thereof. One side of each slab substrate 2 is a long beam 6
Is placed on the short beam 8 orthogonal to the.

Then, joint bars 9 are arranged between the adjacent slab substrates 1, 1, and 1, 2, and cast-in-place concrete 10 is cast on the lower floor 7 to cover the foaming form 4, and the void slab is formed. Complete the build.

The void slab constructed as described above is
At the periphery of a large shearing force acts, the density of the I-beam which is formed between the foaming mold 4 becomes high, L _Y direction perpendicular to the L _X direction and short beam load is perpendicular to the long beam 6 And the periphery thereof can be considered as a single plate supported by the pair of long beams 6 and short beams 8.

In the longitudinal direction of the lower floor 7, the portion where the long side direction of the foaming form 4 is directed in the direction orthogonal to the short beam 8 is defined as 1/6 to 1/3 of the total length of the short beam 8 at each end.
And degree, the entire width of that portion previously set to be 1/3 to 2/3 of the total length of the short beam 8, and is excellent in strength balance of the L _X direction and and L _Y direction.

In the joints between the slab substrates 1 and 1 and between the slab substrates 1 and 2, if the interval between the foaming forms 4 is widened, a long joint bar 9 can be used. The two can be more firmly integrated.

Further, when deformed reinforcing bars are used as the truss bars 5 and the joint bars 9, the adhesion between the reinforcing bars and the concrete is increased, so that the strength of the slab is improved.

[0019]

As described above, the void slab constructed by the method according to the present invention can be designed as a two-way slab supported on four sides as described above.
The slab thickness can be made thinner than the directional slab.

Further, since it can be partially thinned, the notch can be used as a piping space.

Further, the bending and stress are small, and a long span design is possible.

[Brief description of the drawings]

FIG. 1 is an allocation diagram of a foaming formwork in a construction method according to the present invention.

FIG. 2 is a cross-sectional view of a joint portion of the slab board according to the first embodiment.

FIG. 3 is a perspective view of a slab substrate in a conventional construction method.

FIG. 4 is a partially cutaway perspective view of the same void slab.

FIG. 5 is a sectional view of the same void slab.

FIG. 6 is a layout diagram of the foaming formwork according to the embodiment.

[Description of Signs] 1, 2 Slab board 3 Thin PC board 4 Foam form 6 Long beam 7 Lower floor 8 Short beam

Claims (1)

(57) [Claims] 1. A slab substrate is formed by fixing a large number of rectangular parallelepiped foam frames made of a synthetic resin on a thin PC board at a predetermined interval, and laying the slab substrate at a predetermined position and surrounding the periphery. After configuring the lower floor supported by each pair of long beams and short beams, in the method of constructing a void slab that covers the foam form by casting concrete on the lower floor, the long side direction of the foam form, A method of constructing a void slab, characterized in that a middle portion of the lower floor in a longitudinal direction is directed in a direction perpendicular to the long beam, and both ends are directed in a direction perpendicular to the short beam.