RU2577480C1 - Method of creating impervious screen - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to the field of hydraulic engineering and can be used for creation of the screen on the drives of industrial and household waste. Method includes preparing foundation soil, laying him roll insulation of two layers of geotextile, and located between the clay layer with joints of individual panels overlap and dumping the protective layer of the soil. Before dumping a protective layer between the ground with sheets of insulating material in places where they overlap are placed one or more flexible rods with longitudinal ribs, the height of which exceeds the thickness of the layer of geotextile. Use of flexible rods with longitudinal protruding ribs provides a rolling and at the same time reliable connection of panels of insulating material.

EFFECT: butt is simple and little labor-intensive to produce.

1 cl, 2 dwg

Description

The invention relates to the field of hydraulic engineering and can be used to create an anti-filter screen on the drives of industrial and household waste.

A known method of creating an anti-filter screen with a geomembrane from a polymeric material, including preparing a soil base, laying a geomembrane on it and installing compensators for geomembrane deformations with butt joints without fastening to each other and overlapping joints with antifriction gaskets and protective insulating overlays [RF Patent 2374386, IPC E02B 3/16, publ. 11/27/2009 - analogue].

The disadvantages of this method are the unreliability of the joint with expansion joints and the high complexity of its implementation. When the base is sedimented, significant tensile stresses develop in the geomembrane, the joint of the geomembrane panels opens, and liquid-permeable gaps form between the panels and the plates not attached to them.

The high complexity of the screen formation is due to the need for several operations: laying anti-friction linings and protective-insulating linings at the bottom and top of the junction of the geomembrane panels, as well as the formation of recesses in the base soil to accommodate the lower lining.

There is also a method of placing a clay layer in a roll of insulating material with a certain offset relative to the lower layer of geotextile [US Patent 4,501,788 A dated 02/26/1985 - analogue]. Due to the fact that the clay layer and the geotextile covering it does not reach one of the edges of the lower geotextile layer, the panels can be joined in such a way that the lower geotextile layers are overlapped and the clay layers butt. The tightness of the compound is ensured by the swelling of clay.

Reliable joint operation during the implementation of this method is provided only in the absence of sedimentation of the soil base. Otherwise, there is a stretching of the insulating material with the formation of gaps between adjacent panels.

It should be noted that in modern Russian literature an insulating roll material consisting of two layers of geotextile and a clay layer located between them is called, as a rule, a bentomate according to the name of the usually used bentonite clay [Bayev O.A. Impervious coatings using bentonite mats for liquid waste storage // Scientific journal of the Russian Research Institute of Land Reclamation, No. 3 (11), 2013, p. 115-124].

Closest to the proposed invention is the implementation of the glue joint of the panels of bentonite roll materials, when the outer surface of at least one of the panels is covered with water-insoluble adhesive [US Patent 5346566 from 09/13/1994 - analogue]. Preferably, the adhesive is applied in such an amount that it does not completely penetrate the geotextile layers to bind to the clay layer.

As in the two previous methods, when the base is upset, the panels are displaced relative to each other, the joint opens or the geotextile breaks, and liquid leakages inevitably occur. This is especially dangerous for toxic waste storage facilities.

The objective of the invention is to ensure the mobility of the junction of the panels of the bentomate while maintaining its tightness.

This is achieved by the fact that in the method of creating an anti-filter screen, including preparing a soil base, laying on it a roll of insulating material from two layers of geotextile and a clay layer located between them with joints of individual overlapping panels, before pouring a protective layer of soil between the layers of insulating material over the insulating material in the places of their overlap, one or several flexible round rods with longitudinal protruding ribs, the height of which exceeds the thickness of the geotextile layer, are laid .

The sharp edges of the ribs are pressed into the contact layers of the geotextile, preventing the fluid from filtering along them. When the insulating material is stretched, the rods roll over, creating impervious barriers in the new place of the contacting webs.

The proposed method of creating an anti-filter screen is illustrated by drawings, where in FIG. 1 shows the initial state of the joint of adjacent panels, and in FIG. 2 - the joint of the panels after their mutual displacement as a result of the appearance of tensile stresses.

The method is as follows.

On the prepared soil base 1, sheets of rolled insulating material 2, 3 are laid. A joint of adjacent panels 2 and 3 is carried out by overlapping them. Then, raising the edge of the upper panel 3, one or more flexible rods 4 with longitudinal protruding ribs are laid on the lower panel 2. Then proceed to laying the protective layer of soil 5.

The use of flexible rods with longitudinal protruding ribs provides the creation of a movable and at the same time reliable connection of panels of insulating material. The joint is simple and low labor-intensive in manufacturing.

Claims (1)

A method of creating an anti-filter screen, including preparing a soil base, laying on it a roll of insulating material from two layers of geotextile and a clay layer located between them with joints of individual panels overlapping and filling the protective layer of soil, characterized in that before filling the protective layer of soil between the panels of insulating material in the places of their overlap, one or more flexible rods with longitudinal ribs are laid, the height of which exceeds the thickness of the geotextile layer.

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