JPS6132055Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a formwork for a Watsuful slab for forming a ceiling surface having unevenness.

[Conventional technology]

With the recent trend toward lighter weight reinforced concrete structures, a construction method has been adopted in which the thickness of concrete is reduced except for the reinforcement areas when constructing slabs. This construction method involves constructing a lattice beam slab, or Watsuful slab, using a pre-formed formwork, or Watsuful.

Conventionally, as a formwork for this Watsuful slab, there is a trapezoidal formwork made of foamed resin, as described in, for example, Japanese Utility Model Publication No. 47-23634. By arranging these trapezoidal formworks on the panel surface, placing reinforcement between the formworks, and pouring concrete, a lattice beam slab is constructed in the reinforcement area, and the slab in other areas is The aim is to reduce the thickness of the

[Problem that the invention attempts to solve]

However, the formwork of this conventional structure was for forming a single convex portion corresponding to each concave portion of the finished slab surface. Therefore, when laying this formwork on the panel surface, layout and marking are required in order to arrange the many trapezoidal formworks of this structure at equal intervals. Furthermore,
When the slab construction area is large, the work of arranging the trapezoidal formwork becomes very labor-intensive.

Furthermore, when a single formwork is laid on a panel surface, if the bottom surface of the formwork is not flat, the formwork may float above the panel surface. If the formwork floats, concrete will seep into the gap between the formwork and the panel surface, causing the problem that the finished slab surface will not be clean.

This idea was developed in view of these conventional problems,
The purpose of the present invention is to provide a formwork that can easily, accurately, and quickly construct a Watsuful slab.

[Means for solving problems]

In order to achieve this purpose, the formwork for the Watsuful slab of the present invention consists of a rectangular substrate with a plurality of convex protrusions arranged in a lattice pattern, and the whole is integrally formed of foamed resin. Features.

[Effect]

The formwork of this invention can be used for Watsuful slab construction.
The uneven surface of the slab can be formed by simply laying it closely together on the panel surface. Therefore, the next reinforcement work can be carried out promptly.

Moreover, when laying the formwork, a plurality of uneven surfaces can be formed at once.

Since this formwork covers the entire surface of the panel, concrete will not adhere directly to the panel surface. Furthermore, the concrete pressure applied to the rectangular substrate at this time increases the adhesion force to the panel surface, thereby suppressing the infiltration of concrete into the panel surface. The formwork is
Since the concrete can be easily separated from the slab surface after drying, the panels and formwork can be reused very easily.

〔Example〕

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

FIG. 1 is a plan view of a formwork for a Watsuful slab according to the present invention, and FIG. 2 is a sectional view taken along the line - in FIG. 1. In these figures, in the formwork of the present invention, four convex protrusions 3 are provided on a rectangular substrate 2 in this example. The inside of the convex projection 3 may be either solid or hollow. By setting the width from the end surface of the rectangular substrate 2 to the protrusion 3 to be half the distance between the convex protrusions 3, when the rectangular substrate 2 is closely spread on the ceiling panel 1, All protrusions 3
so that the spacing between them is equal.

A method of constructing a Watsuful slab using the formwork for a Watsuful slab having such a structure will be explained based on the sectional view shown in FIG. 3.

The formwork shown in FIG. 1 is laid closely together, that is, without any gaps, on a panel 1 that is horizontally supported from the floor (not shown) by supports or the like. Main reinforcements 4, sub-reinforcements 5, supplementary reinforcements 6, etc. are arranged in three directions on the formwork and between the protrusions 3 of the formwork. These reinforcements are protrusion 3
The spacer 7 is supported by a spacer support 8 embedded in the rectangular substrate 2 to prevent wear and tear of the rectangular substrate due to the load of the reinforcement. .

After this, concrete is poured and after it hardens,
Alternatively, remove the panel and formwork when it is semi-dry. The lower surface of the Watsuful slab constructed in this way has a concave portion corresponding to the convex protrusions 3, and a protruding portion corresponding to the groove-shaped portion between the convex protrusions, and the protruding portion has a lattice shape. Becomes a beam.

In addition, since this formwork is made of foamed resin such as expanded polystyrene, it can also be used as a heat-insulating and sound-insulating slab by attaching it to the bottom surface of the slab and painting it.

The protruding parts of the slab constructed in this way are reinforced, so they are strong, and the recessed parts are thin. Therefore, the overall weight can be reduced.

[Effect of idea]

As explained above, the formwork for the Watsuful slab of the present invention is made up of a rectangular substrate with a plurality of convex protrusions arranged in a lattice pattern, and the whole is made of a single piece of foamed resin. .

Therefore, the formwork installation work can be carried out simply by laying the formwork of the present invention tightly on the panel surface without any gaps. Therefore, the work can be simplified, the construction period can be significantly shortened, and the uneven surface can be positioned accurately. In addition, the contact area of the rectangular substrate in the formwork with the panel surface is wide, and the concrete pressure applied to the rectangular substrate further brings the formwork into close contact with the panel surface, so the adhesion between the panel surface and the formwork increases, and the concrete Infiltration of the liquid into the panel surface is significantly reduced. Therefore, the finished state of the slab surface becomes very clean. Since the formwork of the present invention is made of foamed resin, it is lightweight and can be easily separated from concrete. Furthermore, since the panels do not come into direct contact with concrete, they can be easily released from the mold, and the panels can be reused as many times as needed.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the formwork according to the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1,
FIG. 3 is a longitudinal sectional view showing an example of the construction method using the formwork according to the present invention. DESCRIPTION OF SYMBOLS 1... Panel, 2... Rectangular board, 3... Convex projection, 4... Main reinforcement, 5... Sub-reinforcement, 6... Reinforcement, 7...
...Spacer, 8...Spacer support.

Claims (1)

[Scope of utility model registration request] A formwork for a Watsuful slab, characterized in that a plurality of convex protrusions are arranged in a lattice pattern on a rectangular substrate, and the whole is integrally formed of foamed resin.