RU2614580C1 - Impervious composite sheet - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: impervious composite sheet comprises of bentonite powder or granules sandwiched between the two layers of geotextile, woven and nonwoven, interconnected by needling. Liquid composition is applied to the woven and nonwoven geotextiles and based on polyethylene with the composition layer thickness of 0.2-0.4 mm. To eliminate surfacing under water the coating is made of a layer of fine sand with a fineness modulus of 1.5 micron and with a≤layer thickness of 3-5 mm which is separated from the bentonite by a non-woven geotextile sheet.

EFFECT: waterproofing of the composite sheet and potential placement in the existing irrigation canals and reservoirs without their stopping and emptying.

1 dwg

Description

The invention relates to hydraulic engineering and land reclamation construction and can be used for the installation of anti-filter screens made of composite materials on working irrigation canals and ponds without emptying them.

A known method of creating an impervious screen with a geomembrane of polymer material (patent RU 2374386, publ. 11/27/2009), including the preparation of a soil base, laying on it a waterproof geomembrane consisting of hermetically connected panels of polymer material, a device for compensating deformations of a geomembrane with a butt joint panels in the places where compensators are installed and overlapping joints below and above by strips of material different from the geomembrane material, the device of the protective layer the wound from dirt or other materials.

The disadvantage of this analogue 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. In addition, when the polymer geomembrane is laid in stagnant water, its ascent and drift will occur.

Known geocomposite bentonite mats "Bentomat" company "Cetco" (Company LLC "PSM-CETSO Rus" [electronic resource]. - Access mode: http://psm-cetco.ru/bentomat), which is a polypropylene frame, consisting of two layers of geotextile (woven and non-woven), between which a layer of bentonite clay is placed.

The disadvantage is that according to the technical recommendations for laying [electronic resource]. - Access mode: http://psm-cetco.ru/bentomat/rekomendatsii-po-ukladke - “special conditions”) this geocomposite material (however, like all bentonite mats) cannot be laid in stagnant water, since during the interaction of bentonite hydration occurs with water, an increase in size, the emergence and drift of the cloth. All this does not allow laying bentomats on working irrigation canals and ponds.

The closest technical solution is insulating bentonite mats “Eurobent CS” (“Eurobent Compare zoo”, Poland. - [Electronic resource]. - Access mode: http://eurobent.ru/evrobent-bentonitovyie-matyi/eurobent-cs; https: //www.xn----8sbbeobt9aeakc2cdg3lf.xn--plai/images/pdf/eurobent_gcl_cs_06_4000.pdf), including bentonite in powder form or in granules, placed between two layers of geotextile - woven and non-woven, interconnected needle piercing and bonding with glue with an additional layer of geomembrane.

A significant drawback of Eurobent CS bentonite mats is their inapplicability on existing irrigation canals and ponds. In the case of laying a bentonite cloth on an existing facility (in standing water), it will hydrate, float, and in general the screen design will not perform its functions. In addition, a panel of small thickness geomembrane glued over a woven geotextile will be subject to mechanical damage and possible peeling of the polymer web during operation. Failure to use additional layers from a rolled geomembrane leads to a significant reduction in the volume of work and lower cost of the composite panel.

The goal is to develop a composite waterproofing panel that provides reliable protection against filtration, as well as a waterproof coating on existing facilities (irrigation canals and ponds) without first emptying them.

The technical result, which the invention is directed to, is to ensure the waterproofness of the composite panel and the possibility of laying it on existing irrigation canals and ponds without stopping and emptying them.

The technical result is achieved through the use of an anti-filtration composite panel, including bentonite in a powdered state or in granules, placed between two layers of geotextile - woven and non-woven, while a woven and non-woven geotestile is coated with a liquid composition based on polyethylene, with a thickness of 0.2-0 , 4 mm. To prevent the surfacing of the composite coating under water, it is made with a layer of fine sand with a fineness modulus (M _cr ≤1.5), a layer thickness of 3-5 mm, which is separated from the bentonite layer by a nonwoven geotextile cloth. The connection of individual panels with each other can be made by needle punching.

The invention is illustrated in FIG. 1, which shows an anti-filter composite panel.

The numbers in the drawing indicate:

1 - bentonite;

2 - woven geotextile coated with a liquid composition;

3 - non-woven geotextile coated with a liquid composition;

4 - fine sand;

5 - cloth non-woven geotextiles.

Antifiltration composite panel is made as follows (Fig. 1).

Bentonite 1 (in powder form or in granules) is placed between two layers of geotextile woven 2 and non-woven 3, on which, in turn, is applied a liquid composition based on polyethylene (composition layer thickness 0.2-0.4 mm), fixing woven 2 ( upper) and non-woven 3 (lower) geotextiles, preventing the formation of damage and intensive filtering through geotextile panels. To prevent surfacing of the composite panel under water, it is made with a layer of fine-grained sand 4 (with a fineness modulus M _cr ≤1.5, layer thickness 3-5 mm), which, in turn, is separated from the bentonite layer 1 by a nonwoven geotextile panel 5. The connection of individual panels with each other can be made by needle punching.

Impervious composite fabric works as follows.

Composite waterproofing panels are laid on the irrigation canal (pond) without emptying, this eliminates the emergence of panels (through the use of a sand layer), as well as premature hydration of bentonite through the use of woven and non-woven geotextiles treated with a liquid composition based on polyethylene. When damage is formed in the composite panel, bentonite is hydrated, which ensures the integrity of the entire coating structure.

The developed antifiltration composite panel is characterized in that it can be laid on existing objects (irrigation canals and ponds) without their preliminary emptying. The use of woven and non-woven geotextiles treated with a liquid composition will ensure the integrity and waterproofness of the coating.

Claims (1)

Impervious composite fabric, including bentonite in powder form or in granules, placed between two layers of geotextile - woven and non-woven, interconnected by needle punching, characterized in that a woven and non-woven geotextile is coated with a liquid composition based on polyethylene with a thickness of 0.2 -0.4 mm, to prevent surfacing of the coating under water, it is made with a layer of fine sand with a fineness modulus M _cr ≤1.5 with a layer thickness of 3-5 mm separated from bentonite by a non-woven cloth th geotextile.

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