SU139804A1 - Metal formwork for concrete and concrete products - Google Patents

Description

Known formwork for the manufacture of concrete and reinforced concrete products, including wooden shields with fixed on their surface, and (metal sheets 0.4-0.6 mm thick) are known.

However, during operation, great efforts are required to detach the products during the demolding from the inner surfaces of the formwork.

The formwork, performed by the invention, is devoid of this disadvantage. The essence of the invention lies in the fact that, on the inside of its inner surface, thin elongation sheets, made, for example, of metal, are fixed along the entire perimeter.

FIG. Figure 1 shows a diagram of the pre-molded formwork during the manufacturing process; pas figs. 2 the same in the process of stripping.

An elastic coating 2 (metal sheet 0.4-0.6 mm thick or PVC plastic material 3-5 mm thick) is attached to the supporting metal sheet formwork / fixing it to the SHEET} of the formwork around the perimeter (electric welding, metal stripes with VPPT, etc. ). In this design, the stripping process is divided into two stages: first, a breakaway occurs along the contour of fixation of an elastic coating with a bearing .iiiCTOM formwork, later - a gap from the outer coating 2. The pullout force P required for the second stage of stripping is several times less pr1; lagging effort of separation in the first stage. Thus, for stripping it is required to apply a force determined by the area of the anchorage, a shadow of the elastic coating, which is very weak in terms of the entire formwork area.

The proposal improves the design of the inventory metal formwork and makes it possible to significantly reduce the specific adhesion force of the formwork to concrete without compromising its strength, which helps to increase the formwork turnover and creates this very positive effect.

The experiments carried out by the authors showed the possibility of reducing the required specific effort of breaking the formwork from concrete up to 20 times.

 p with dme t and 3 o breten e

: Metallic onalubka for concrete and reinforced concrete products, characterized in that, in order to reduce the force of separation of the product, on the inner surface of it are fixed but the entire perimeter of thin elastic sheets, made, for example, of metal.

   -.S- - .a. : .-

; - s: -: - -.

... and .-; p: .., // -1-- - -l.s.sz. -

l .. u,. : .--., .-. .-. /

Fi &. I

Pus g