METHOD TO RAISE WATER LEVEL IN SMALL WATERCOURSES AFTER DREDGING WORKS (VERSIONS) Russian patent published in 2013 - IPC E02B3/02 E02B7/02 E02B3/12 

FIELD: construction.

SUBSTANCE: method to raise a water level in small watercourses after dredging works includes erection of a retaining dam upon completion of dredging works. The main dam body is created from soil. At least one flexible concrete mat is arranged in the outer part of the dam. The height of dam is by 10÷80% less than the height of the dredged riverbed wall. The second version of the method includes erection of a cascade of retaining dam. The second dam of the cascade is erected by 0.1÷0.3 m below at the elevation from the sea level. To erect a retaining dam, dredging works are carried out in separate sections of the riverbed. The distance between sections is selected as equal to the width of the main dam body. Then the height of the main dam body is adjusted, and it is coated with a flexible concrete mat. The retaining dam comprises the main body. The outer part of the dam comprises at least one flexible protective mat. The flexible concrete mat comprises concrete blocks connected to each other row-by-row and within with a gap by flexible elements. The mat comprises an anti-suffosion element and/or elements for complete closure of gaps between all concrete blocks or between their part. The width of gaps between at least 75% of the blocks in the mat makes from 1 mm to 25 mm in the length of at least 80% of the dimensional length of blocks adjacent to each other. Concrete blocks have height from 50 mm to 350 mm.

EFFECT: raising water level in small watercourses after dredging works, simplified dam design, increased manufacturability of its creation, high extent of protection of a soil main body of the dam.

22 cl, 8 dwg