SU1004096A1 - Method of moulding reinforced concrete articles - Google Patents

Description

(54) METHOD OF FORMING CONCRETE PRODUCTS

The invention relates to the building materials industry, namely the production of reinforced concrete products with voids.

The known method of manufacture with the removal of the insert attached to. a movable cross-beam with electromagnetic vibrators of directional action, using the screw-pinned mechanism of the short-cut formed product used in the plant for the manufacture of concrete hollow-core products.

The closest to the invention is the method of forming reinforced concrete products, including filling the pre-compacted mold mixture and its continuous movement with the molded product. From the 45 attenuated pillars, fixed on the traverse making longitudinally directed oscillations. Removal of the hollow core is carried out by means of hydraulic cylinders 2.

A disadvantage of the known methods is the low molding speed, since the extraction of the hollow-forming agents is performed mechanically, the vane-formers draw into vibration a layer of concrete mixture in contact with them, which shifts relative to the mass of the concrete of the products when they are extracted and leads to disruption of the structure of the product.

The purpose of the invention is to increase the speed of molding and improve the quality of products.

The goal is achieved by the fact that, according to the method of forming reinforced concrete products, including the filling of a form with a pre-compacted concrete mix and its continuous movement with a moldable product relative to the empty specimen, the guide is longitudinally directed

15 oscillations, hollowers, in the kykdy period of oscillation, at the time of their extraction, an additional acceleration of 15-20 g is reported by means of a blow in the direction opposite to the motion

20 molded product.

FIG. 1 shows an inventive device for carrying out the proposed method, a longitudinal section; 2, the same plan view ..

25

The installation consists of a hopper 1, on which the vibrator 2t is rigidly fixed, the Form 3 is located on the drive roller 4. In the form, the holders 5, fixed

30 on traverse 6 and installed on the foundation 7 through elastic elements 8, Inside the traverse 6 there is a drummer 9 with a rubberized impact surface and connected to the traverse through elastic elements 10. On the drummer 9, the traverse 6 is rigidly fixed to the striker 12. When the product is molded, the shape 3, they start moving, include a hollow core exciter, which informs them of longitudinally directed oscillations with a frequency of 50 Hz and a 0.4-0.6 mm wide pitch, with the vibration locomotive waking up during each period of oscillations of the hollow core in zbuzhdaet blow oscillations traverse drummer who reported inside core m additional acceleration directed in the direction opposite to the motion of a form, and equal 15-20 d. Example. A slab of 2x5.5x0.22 m in size is formed, the diameter of the void former is 159 mm, the number of voidformers is 7 pieces. When forming a plate, empty formers report harmonic oscillations with a frequency of 50 Hz and an amplitude of 0.5 mm and an additional acceleration in each oscillation period of a magnitude of 15 g with an amplitude of oscillation of 1.5 mm. As a result of the free movement of the concrete product along the hollow by the former together with the mold, molding is provided at a speed of up to 3 m / min, i.e. the molding time of the product is 6-8 minutes; and the molding time in a known manner is 10-12 minutes.

Offer Note. 5,10, ..., 30 is the total acceleration, i.e. harmonic

(5d) + additional (5 - 25d).

 - forming speed when moving together with the shape of the hollow core (prototype). The test results are presented in the table. With an additional acceleration of less than 15 g, there is still a drag on the concrete in contact with the core holders, and, accordingly, a discontinuity of the product occurs, as well as a decrease in the molding speed due to considerable resistance to the concrete as it passes through the core holders during the molding process. With an additional acceleration of 15 g, the inertial force of concrete is 25%, and at 20 g it exceeds by 50% the force of adhesion of concrete to hollow-cores, which completely eliminates the violation of the concrete structure of the product, i.e. discontinuity, macro- and microcracks, and contributes to an increase in the molding speed. Since the concrete is not entrained by the hollow cores when they are removed, while moving the hollow cores towards the molding with an acceleration of 4-6 g, they contribute to the displacement of the concrete mix in the same direction due to the adhesion forces. Increasing the additional acceleration of 20 g does not give a gain in improving the quality, but only leads to additional energy costs for creating more / than 20 g of acceleration. The proposed molding method allows an increase in productivity by 20-30% and an improvement in the quality of products by eliminating the discontinuity of the products when removing the hollow core.

Claims (1)

Claim The method of forming reinforced concrete ·. products, including pre-filling. compacted concrete. with a mixture of molds and its continuous movement with the molded product relative to hollow shears that perform longitudinally directed vibrations, with the exception that, in order to increase the speed of molding and improve the quality of products, hollow formers in each oscillation period, at the time of extraction, an additional acceleration of 15-20 g is reported by means of a blow in the direction opposite to the movement of the molded product.