RU155456U1 - SELF-HEALING POLYMER ANTI-FILTRATION SCREEN - Google Patents

Abstract

Self-healing polymer antifiltration screen, including prepared soil base, laid geomembrane, arranged protective soil layer, characterized in that a layer of bentonite powder is applied under the polymer geomembrane, which is protected on the underside with a geotextile cloth.

Description

one

SELF-HEALING POLYMER ANTI-FILTRATION SCREEN

The utility model relates to the field of hydraulic engineering construction and can be used to create antifiltration protection on waste collectors, ponds and ponds, as well as on sections of irrigation canals in highly filtering soils (gravel-pebble), in areas in the embankment and slopes where the use of highly reliable antifiltration is required screens.

A known method of creating an anti-filter screen by loosening the surface layer of the soil and the simultaneous supply of mudding solution, for example from a surfactant (SU 1065522, publ. 09.07.82).

The disadvantage of this method is that it leads to complication of production and high labor costs in its implementation, due to the fact that all the technological operations of the method are very time-consuming.

A known method of creating antifiltration

waterproofing coatings from oil production wastes (asphalt paraffin tar deposits) and polyethylene wastes in the form of granules and film (RU 2211817, publ. 2003.09.10), which consists in mixing the components when heated to a temperature of 130 ° C for 45 minutes, followed by cooling in air in within 3 hours.

When interacting with a highly mineralized filtrate, it is possible to extract toxic elements from the screen composition, in particular, oil products, which leads to a decrease in coating strength, increased water absorption and filtration capacity.

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A known method of creating an antifiltration coating (SU 1174519 A, publ. 08.23.1985), in which a two-layer coating is first laid around the channel perimeter, concrete is pumped into the cavity between the layers through the mouth (receiving hopper).

The disadvantage of this method is that, for uniform filling of the entire antifiltration coating, it is necessary to pump concrete from several positions.

The closest technical solution is a method of creating an impervious screen with a geomembrane from a polymeric material (RU 2374386, publ. 11/27/2009), which includes preparing a soil base, laying a waterproof geomembrane on it, consisting of hermetically connected panels of polymeric material, and a device for compensating geomembrane deformations with the butt connection of the panels in the places of the expansion joints, the device of the protective layer of the screen from the ground or other materials.

The disadvantage of this method is the low operational reliability due to erosion and sliding of the protective layer of the impervious screen from soil or other materials, as well as the likelihood of damage to the geomembrane during installation or welding.

The technical result of the utility model is to ensure high operational reliability and tightness of the anti-filter screen, due to self-healing of possible damage to the geomembrane as a result of hydration of bentonite with leaked water, saving labor resources, eliminating the time-consuming process of controlling damage, excavating and repairing it.

The technical result is achieved through the use of a screen including a polymer geomembrane, under which a layer of bentonite powder is applied (having the ability to regenerate when it is wetted when mechanical damage to the geomembrane occurs), 3

protected from the underside with a geotextile cloth to prevent leaching of the dissolved mass of bentonite into the lower layers.

The utility model is illustrated by the following drawings: FIG. 1 - self-healing anti-filter screen; FIG. 2 - the process of self-healing of lesions in the geomembrane.

The numbers in the drawing indicate: 1 - a protective layer of mineral soil; 2 - polymer geomembrane; 3 - a layer of bentonite powder; 4 - a cloth of geotextiles; 5 - prepared soil base; 6 - area of self-healing damage.

The self-healing polymer antifiltration screen includes (Fig. 1, 2) a polymer geomembrane 2, under which a layer of bentonite powder 3 (0.5-1.0 cm thick) is applied, which in turn is protected from the bottom by a geotextile 4 (for example, geotextile “Dornite”), while laying was done on a prepared soil base. To avoid damage in the polymer geomembrane 2, a protective layer of mineral soil 1 was made. The tightness and operational reliability of the anti-filter screen is ensured by the possible hydration of the polymer geomembrane 2, hydration of the bentonite powder 3 and self-healing of possible damage 6 in the polymer geomembrane 2 This ensures complete tightness of the entire design of the anti-filter screen.

The self-healing polymer antifiltration screen is distinguished by high tightness, the lowest possible filtration coefficient K _f ≤1 · 10 ^-12 cm / s, as well as the exclusion of time-consuming work to control the integrity (continuity) of the geomembrane and the need to repair the detected damage.

Claims (1)

Self-healing polymer antifiltration screen, including prepared soil base, laid geomembrane, arranged protective soil layer, characterized in that a layer of bentonite powder is applied under the polymer geomembrane, which is protected on the underside with a geotextile cloth.

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