RU1788181C - Vacuum shield - Google Patents

Abstract

Use: in construction, in particular for molding concrete and reinforced concrete structures by vacuum. SUMMARY OF THE INVENTION: The intermediate cavities are formed by gaps between the main cavities and communicate with the atmosphere through the end parts of the shield, 3 silt.

Description

The invention relates to the construction, in particular to the molding of concrete and reinforced concrete structures by the vacuum method.

Known vacuum shield containing a rigid frame, coated on the side of the vacuum cavity with sheet metal, with rubber sheets with rubber pipes vulcanized to it and a vacuum manifold, the vacuum cavity provided with partitions forming sealed cells, each of which communicates with the vacuum collector, by means of a disconnecting device made in the form of a spool, placed in the corners of the cells of the same name.

The disadvantage of this device is the attenuation of the evacuation process, which occurs when the pressure is equalized in the pore space and in the cavities connected to the vacuum system, i.e. acceleration of the suction process depends on the simultaneous suction of air into the pore space of the evacuated concrete mixture.

A vacuum shield (prototype) is also known, comprising a frame, the cavities of which are connected to a vacuum system, a power element and a filter placed inside them, and intermediate spaces communicating with the atmosphere are made in the spaces between the main cavities.

The disadvantage of this device is the design complexity due to the presence of additional cavities equipped with nozzles for communication with the atmosphere and perforated power elements. In addition, this device is unreliable operation due to possible clogging of the nozzles of the additional cavities with mortar, rubble, debris, which will lead to a deterioration or termination of the vacuum process.

The purpose of the invention is to increase reliability and simplify the design.

The goal is achieved by that; that in a vacuum shield containing a frame, separated into main and intermediate cavities in communication with the vacuum system, and a filter element, intermediate cavities are formed by gaps between the main cavities and communicate with the atmosphere through the end parts of the shield.

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In FIG. 1 shows a vacuum shield, a general view; in FIG. 2 is a section AA in FIG. 1; in FIG. 3 is a general view in axometry.

The vacuum shield consists of a frame 1 divided into main cavities 2, communicating with the vacuum system via nozzles 3 and intermediate cavities 4, which are in communication with the atmosphere through the end parts of the shield. A filter 5 adjacent to the cavities 2 is laid on the evacuated product 6..

Vacuum shield works as follows.

A filter 5 is laid on a compacted concrete mixture laid in a mold, and a vacuum shield is placed on top. The nozzles 3 of the main cavities 2 are connected to a vacuum system. Depression will occur only in the cavities 2 to the thickness of the layer of the molded product, resulting in a pressure gradient. . :

The movement of water from the distant layers to the cavities 2 will be carried out due to the movement of air trapped in the pore space and having excess pressure, during which equalization, if there were no intermediate cavities 4 communicating with the atmosphere through the end

parts of the shield, the evacuation process would begin to fade.

The presence of intermediate cavities 4, through which air is sucked into the pore space of the evacuated concrete mixture, helps to intensify the evacuation process.

The formation of intermediate cavities by the gaps between the main cavities and their communication with the atmosphere through the end parts of the shield simplifies the design, since no additional cavities need to be made in the vacuum shield and provided with nozzles for communicating with the atmosphere, as is the case in the prototype.

In addition, the proposed vacuum shield can vacuum products of various sizes.

Claims (1)

Formula invented and A vacuum shield containing a frame divided into main and intermediate strips ™ in communication with a vacuum system and a filter element, characterized in that, in order to increase reliability and simplify the design, intermediate cavities are formed with gaps between the main cavities and communicated with the atmosphere through the end parts of the shield.