RU1803322C - Built-up matrix for forming hollows in preliminary tensioned reinforced concrete building articles - Google Patents

Abstract

SUMMARY OF THE INVENTION: a composite matrix for forming depressions in prestressed reinforced concrete building products comprises a housing 2 with detachable end sections 1. The end sections are vertically movable and secured to the matrix body 1 by wedge latches 3. The contact surfaces of the end sections with the housing are inclined under angle 45 ° to the horizontal plane. 3 ill.

Description

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GO 00 Yu Yu

The invention relates to the construction of metal molds for the manufacture of prestressed reinforced concrete products having large recesses, prestressed reinforced concrete ribbed plates and the like. products.

The aim of the invention is to facilitate the stripping process and improve product quality.

Figure 1 shows a longitudinal section of a mold; figure 2 is the same side view; in Fig.3 - the position of the end part of the matrix when stripping.

The composite matrix is made of two movable end sections 1, tightly adjacent to the stationary housing 2 of the matrix. In the initial position, the movable end sections, the contact surfaces of which are inclined at an angle of 45 ° to the horizontal plane, are held by wedge-shaped clamps 3.

During the formwork, when lifting -, under the action of tensile reinforcement, the product is shortened by 2a (see Fig. 3). So, as the movable end sections 1 of the matrix have the possibility of free movement both up and in the direction of the longitudinal axis of the product. whether, slipping along an inclined plane at a 45 ° interface plane with the matrix body 2.

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the product is removed from the die without jamming. With further lifting of the product, the wedge-shaped retainers 3 hold the movable end sections in place, and under the influence of their own gravity, they return to their original position.

The invention allows the stripping of ribbed reinforced concrete products with prestressed reinforcement to remove them from the matrix without jamming, which prevents defects in the form of broken ribs and cracks. Wedge-shaped clamps make it easier if they facilitate the process of stripping the product and preparing the mold for filling, as it provides both the initial position of the moving end sections and their removal from the product.

Claims (1)

SUMMARY OF THE INVENTION A composite matrix for forming depressions in prestressed concrete building products, comprising a housing with detachable end sections, characterized in that, in order to facilitate the formwork process and improve product quality, the end sections are vertically movable and attached to the matrix body by wedge clamps, and the contact surfaces of the end sections with the body are inclined at an angle of 45 ° to the horizontal plane. Fie.g ////// / / / / /, / / ". AZhK “%“ “%“, LV ““ Ж Ь.Ж ““. G "