RU2530989C2 - Method for production of flexible impervious screen - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method for production of flexible impervious screen includes laying of reinforcing layer on the prepared channel floor and application of melted synthetic material on it. Nonwoven geotextile and geogrid are used as the reinforcing layer. Melted polyethylene wastes are applied on the reinforcing layer. Reinforcing layer is fixed in indents, arranged on the edges of channel slope, or to foundation soil by means of metal anchors.

EFFECT: water losses through the impervious lining of channel are eliminated.

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Description

The invention relates to the field of hydraulic engineering and can be used to create impervious protection of reservoirs and canals with heaving and subsiding soils at the base.

There is a method of creating an anti-filter screen (SU A.s.№1476044, E02B З / 16, 13/00, BI: No. 16 dated 04/30/1989), including pouring with a mud solution of soil with subsequent plowing and applying seeds to the soil. Loosening of the soil is carried out with the simultaneous supply of a matting solution with seeds of annual and perennial grasses and fertilizers to the sole of the loosened soil.

The disadvantage of this method is the growth of perennial herbs on the antifiltration coating during its operation. For this reason, this method is unacceptable for irrigation canals, since aquatic vegetation significantly reduces the channel throughput.

A known method of antifiltration protection of irrigation canals (SU A.s. No. 254398, E02D 19/16, BI: No. 31 of 10/07/1969), which consists in the fact that to reduce the permeability of the bed of the channel, bottoms of the synthesis of fatty alcohols are used, which are fed simultaneously with irrigation water in the form of a solution by means of stemming with insulated compartments.

The disadvantages of this method:

- the need to create isolated compartments in the canals leads to a temporary stop of the canal and, as a result, water supply to water consumers;

- Soaking the soil is a fairly lengthy process that requires considerable time.

The closest technical solution is the method of constructing an antifiltration coating (SU А.s.№254398, E02D 19/16, BI: No. 31 dated 10/07/1969), which includes the manufacture of a waterproof screen by applying a layer of isothermally molten synthetic material, such as polyisobutylene, to the nylon fabric. , with a coefficient of friction greater than the coefficient of internal friction of clothing materials.

The disadvantages of this method:

- the need to create a protective coating of monolithic concrete;

- reduction of physical and mechanical characteristics of the material after 2 years of storage of the material in the open air.

The essence of the invention is to develop a method of creating a flexible anti-filter screen, resistant to subsidence and heaving of the soil of the base and with the possibility of its operation without a protective coating, performed by applying molten polymer to a reinforcing layer made of geogrid and non-woven geotextiles located on the prepared base.

The technical result of the invention is the elimination of water losses through the antifiltration lining of the channel, reducing the cost of building antifiltration coatings, the possibility of recycling polyethylene.

The technical result is achieved by applying a molten polymer, namely brought to a fluid state of polyethylene waste on a reinforcing layer made of a geogrid with a mesh size of not more than 15 mm, laid on a non-woven geotextile, with a density of 200-300 g / m ² located on the prepared base. In this case, the molten polymer is applied with a layer of at least 10 mm, which significantly increases the reliability of the structure and eliminates the need for additional protective coatings.

Flexible anti-filter screen can be performed in two versions.

According to the first embodiment, a flexible anti-filter screen is arranged as follows. They prepare the bottom, edges and slopes of the channel, the base soil is cleaned of the roots of plants, boulders, and then compacted. On the edges of the canal, strokes are made, at a distance of 0.5 m from the edge of the canal, 0.3 m deep, in accordance with generally accepted recommendations (Instructions for the design and construction of anti-filter devices from plastic film for artificial reservoirs. (SN 551-82). - M. : Stroyizdat, 1983. - 40 p. [Appendix 5]). Then a reinforcing layer is arranged, a nonwoven geotextile with a density of at least 250 g / m ² and geogrids with mesh sizes of no more than 15 mm are laid on the prepared base. When the reinforcing layer is installed, the cutting of geotextile and geogrid rolls is carried out taking into account mounting runs equal to 1.0 m, which are filled into shabra made on the edge of the channel slopes. In order to secure the reinforcing layer in the bed of the channel, the fines are covered with soil. Then, a molten polymer is applied to the reinforcing layer, namely, polyethylene waste brought to a fluid state with a layer of at least 10 mm.

According to the second option, a nonwoven geotextile with a density of at least 250 g / m ² is laid on the prepared base of the channel bed, then a geogrid with a mesh size of no more than 15 mm is laid, while the geotextile and geogrid serve as a reinforcing layer. The cutting of geotextile and geogrid rolls is carried out without taking into account mounting runs, fixing the reinforcing layer in the channel bed is carried out by fixing it to the base soil with metal anchors 30-50 cm long, depending on the properties of the base soil. On the laid and fixed reinforcing layer, a molten polymer is applied, namely, polyethylene waste brought to a fluid state with a layer of at least 10 mm.

Component materials for a flexible anti-filter screen are delivered to the construction site by road, unloading and laying are done manually. Depending on the location of the construction site, polyethylene waste can be delivered in a molten state or melted directly at the facility.

A method of creating a flexible anti-filter screen is illustrated in FIG. 1 and FIG. 2. Figure 1 - Flexible anti-filter screen (option 1, Node A). Figure 2 - Flexible anti-filter screen (option 2, Node A). A method of creating a flexible anti-filter screen includes the following elements: (figure 1) soil base of the slope 1; geotextile 2; geogrid 3; 4; layer of molten polyethylene waste 5; (Fig.2) the soil base of the slope 1; geotextile 2; geogrid 3; layer of molten polyethylene waste 4; anchor 5. A method of creating an impervious coating is performed as follows:

- according to the first method, (Fig. 1) on the prepared soil base of slope 1, a reinforcing layer of geotextiles 2 and geogrids 3 is arranged, then on the edges of the geotextiles and geogrids are fixed on the edges of the slope in the line 4, then a melt of polyethylene waste 5 is applied to the reinforcing layer ;

- according to the second method, (FIG. 2), on the prepared soil base of slope 1, a reinforcing layer of geotextiles 2 and geogrids 3 is arranged, while the geotextiles and geogrids are fixed to the base soil with metal anchors 5, then a polyethylene waste melt is applied to the reinforcing layer four.

Application, to create a flexible antifiltration coating, of elements such as geotextiles and geogrid will ensure reliable and durable operation of the coating on subsidence and heaving soils of the base, while the water resistance of the coating is achieved by applying molten polyethylene waste to the reinforcing base with a layer of at least 10 mm, providing resistance anti-filter screen to external influences without the use of protective layers of soil, concrete or other materials, in addition, the use of struction polyethylene waste will facilitate their reuse.

Claims (1)

A method of creating a flexible anti-filter screen, including laying a reinforcing layer on a prepared bed of a channel and applying molten synthetic material on it, characterized in that non-woven geotextiles and geogrid are used as a reinforcing layer, on which the polyethylene waste melt is applied, while the reinforcing layer can be fixed to shtabs arranged on the edges of the channel slope, or to the foundation soil using metal anchors.

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