JPS6119783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing concrete slag from adhering to the surface of a pre-formed slab.

Generally, slabs in a structure are constructed sequentially starting from the downstairs, so when forming the upper floor slab, some of the concrete poured on the slab formwork often falls and adheres to the surface of the slab downstairs. . This deposit is called concrete slag,
It is easy to peel off the concrete slag immediately after it adheres, but each time the concrete slag falls,
Removing this would cause problems with workability, so it is usually left until after the upper floor slab is formed. As a result, the adhesion of the concrete slag to the downstairs slab increases and its removal becomes very difficult.

As shown in Figure 1, to remove concrete slag 2 with strong adhesion that has fallen onto the surface of slab 1,
It becomes necessary to carry out chisel work, and at that time, there is a risk of damaging the surface of the slab 1, as shown in FIG.

In recent years, in many structures, slabs are often directly finished with concrete, so if the surface is damaged by removing adhering concrete slag, repair work is required.

As a measure to prevent the adhesion of concrete slag, a method is often adopted in which plaster is spread over the surface of a pre-formed slab, but in this case, if it is spread before assembling the formwork for forming the slab, it will be difficult to assemble the formwork. On the other hand, if this is done after the formwork has been assembled, the problem arises that the entire surface of the slab cannot be covered due to the large number of pipe supports for supporting the formwork.

Therefore, it is an object of the present invention to provide a method for preventing the adhesion of concrete slag that has fallen onto an existing slab, which can completely prevent the adhesion of concrete slag over the entire surface of the slab, and also facilitate the work of recovering the slag. The purpose is

In this invention, calcium carbonate is uniformly spread over the entire surface of a pre-formed slab, and the protective film of calcium carbonate prevents the adhesion of fallen concrete slag.

As shown in Fig. 3, by spraying calcium carbonate over the entire surface of the existing slab 1 to form a protective film 3, the concrete slag 2 that fell during pouring of concrete for forming the upper floor slab will be removed from the surface of the existing slab 1. Since it is deposited on the protective film 3, it is possible to prevent concrete slag 2 from adhering to the surface of the slab 1.

Concrete slag 2 on slab 1 like this
As shown in FIG. 4, the concrete slag 2 can be recovered easily by scraping off the protective film 3 of calcium carbonate.

As described above, the present invention makes it possible to reliably prevent fallen concrete slag from adhering to the slab by a simple operation of uniformly dispersing calcium carbonate on the existing slab, and also to prevent the calcium carbonate from adhering to the slab. Concrete slag can be collected by simply scraping it up, making the collection process easy. Furthermore, since calcium carbonate, which is inexpensive, is used, it is economical and the spraying operation is easy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a slab surface with concrete slag adhered to it, Fig. 2 is a sectional view of the same as above with the slag removed, and Fig. 3 is a sectional view of a slab surface obtained by implementing the method according to the present invention. Fig. 4 is a cross-sectional view showing the condition in which calcium carbonate is sprinkled on the slab surface, and Fig. 4 is a cross-sectional view showing the condition in which concrete slag is collected from the surface of the slab. 1... Slab, 3... Calcium carbonate protective film.

Claims (1)

[Claims] 1. A method to prevent concrete slag from adhering when forming a concrete slab by uniformly distributing calcium carbonate over the entire surface of a pre-formed slab.