RU2023789C1 - Water reservoir counter filtration screen formation method - Google Patents

Abstract

FIELD: hydraulic technology. SUBSTANCE: method provides for spreading on water reservoir bottom of water-resistant film and formation of its protecting layer of ground. After film cover has been laid on water reservoir bed formation of protecting layer is made by directed deposition of soil hydraulically, using angular wash out by compact spray of three embankments, that form in plan contours of schemes of deposition in calculated intervals of space on water reservoir bed. Initial deposition of protecting layer hydraulically is exercised after formation of two adjacent schemes of deposition of soil hydraulically. EFFECT: method of counter filtration screen formation is used in hydraulic technology. 2 cl, 3 dwg

Description

 The invention relates to the construction of water facilities and can be used to create anti-filter screens on ponds and canals.

 The purpose of the invention is improving the quality of the screen while reducing the cost of work.

 In FIG. 1 presents a plan of the alluvium map; figure 2 is a cross section aa in figure 1; figure 3 is a longitudinal section bB in figure 2.

 The proposed method includes laying a waterproof film 1 on a soil base 2 and cushioning material 3 to protect the film from damage by the soil of the embankments 4, which are the material of the backfill of the protective layer 5, a fragment of the trench 6 to fix the edges of the film and the use of a water outlet 7 of the dam 8 to discharge clarified water .

 A method of creating a protective layer of soil-film screen is as follows.

 The calculated section of the soil base 2 (Fig. 1) of the pool near the dam 8 is covered with a waterproof film 1 (Fig. 2), the edges of which are led into the trench 6 (Fig. 3) and covered with soil. In places where the embankments 4 are filled in, waterproof material 3 is laid on a waterproof film, for example fiberglass (Fig. 3). The embankments are sprinkled with mechanisms on three sides: at the top along the edges of the screen and along the bed parallel to the dam. After preparing the first alluvium map, a second one is prepared. For this, a waterproof film 1 is also laid on the bed of the future reservoir, and in the places where the embankments are filled 4, cushioning material 3.

 Then, embankments are sprinkled along the edges and at the estimated distance parallel to the dam 4. The volumes of embankments and the dimensions of the alluvial maps are determined from the conditions for creating a continuous protective layer of soil with a thickness of 20-30 cm. As established by studies, such a thickness of the protective layer will fully protect the waterproof film 1 from the most dangerous for her mechanical and radiation damage. When both cards are ready, start the alluvium. To do this, using a compact jet from a fire or watering machine, erosion of the embankments 4 located above is carried out. The resulting pulp flows down the slope, leaving settling particles in its path. Depending on the transportation distance of the pulp, the angle of the water-jet stream relative to the embankment also changes. If the distance is significant, then the jet is directed in the direction of the pulp, if it is minimal, in the opposite direction from the pulp.

 After the upper embankments, erosion of the embankment located parallel to the dam is started. During the washing process, the water outlet 7 is constantly open to discharge clarified water. If a significant accumulation of washed-up soil is detected on the map, it is washed away by a compact stream until the protective layer 5 reaches uniform thickness. After erosion of the embankments of the first card, the protective layer 5 of the second card is washed in a similar manner. In parallel with this, ahead of one map, they are working on laying a waterproof film and dumping embankments. The described technology is reported before the completion of the shielding work.

 The proposed method for creating a protective layer of the soil-film screen improves the quality due to the directed and uniform washing of the soil without stopping the construction mechanisms, which significantly damage the waterproof film, reduce labor costs and allow the possible damage to the plastic film to be clogged, which significantly increases the antifiltration properties of the soil-film screen.

Claims (2)

 1. METHOD FOR CREATING AN ANTI-FILTRATION SCREEN OF A WATER BODY PACK, including laying a coating of a waterproof film in the bed of a reservoir and making a protective layer of soil, characterized in that, in order to improve the quality of the screen while reducing the cost of work, after laying a coating of a waterproof film in the reservoir’s bed the protective layer is carried out by directional alluvial by angular erosion by a compact stream of three embankments, forming in plan the contours of the alluvial maps at design intervals along the bed of the reservoir.  2. The method according to claim 1, characterized in that the initial deposit of the protective layer is made after the formation of two adjacent alluvium cards.

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