HRP20151283T1 - Method and device for laying down and tensioning an impermeable cover for hydraulic works in loose material - Google Patents

Claims (17)

1. The procedure for laying and tightening the impermeable cover, which includes a series of geostrips (20) made of flexible synthetic material, on the surface (12, 13) of the water management structure in loose material, which includes the steps: excavation of a large number of spaced trenches (14) that extend in one direction on the surface and in the ground (12, 13) of the water management structure; creation of individual trenches (14) with flat end surfaces suitable for placing geostrips (20) i laying unrolled geostrips (20) and in contact with the surface (12, 13) of the water supply facility, overlapping the opposite edges of neighboring geostrips (20) and filling geostrips (20) into trenches (14) with fill material (22, 22A); indicated by the fact that the excavation of said larger number of trenches is carried out, comprising the first and second rows (14a, 14b) of alternating trenches (14); tight joining of the overlapped edges of a large number of geostrips (20), whereby when laying a large number of geostrips (20), the overlapping arrangement of the geostrips (20) on the trenches (14) is maintained; pressing the geostrips (20) to penetrate into the cavities of the first row of trenches (14a), blocking them with the first ballast filling material and then tightening the geostrips (20), by pressing them into the cavities of the second row of trenches (14B), blocking them in a tensioned state with the second ballast material (22A). 2. The method according to patent claim 1, characterized in that the shaped surface of the trenches (14) in contact with the geotapes (20) consists of a fine, inert material, the size of which is equal to or less than 0.5 mm. 3. The method according to patent claim 1, characterized in that it includes additional steps: partially filling each trench (14) with a first layer (15) of drainage material and then filling the trench (14) with a second layer (17) of inert, packable filter material and configuring the second filtering layer (17) with a longitudinal channel (18), which is formed by uniform contact surfaces with geostrips (20). 4. The method according to patent claim 1, characterized in that the geostrips (20) are laid in the trenches (14) in the transverse direction. 5. The method according to patent claim 1, characterized in that a larger number of pre-welded geostrips (20) are laid in the trenches (14) longitudinally. 6. The method according to claim 3, characterized in that the layer of drainage material (15) is geodrain. 7. The method according to patent claim 6, characterized in that the layer of drainage material (15) is selected from: gravel, geogrid, geogrid, geomat or their combination. 8. The method according to patent claim 1, characterized in that the layer of filtering material (17) is selected from: lime, sand, finely rounded gravel, geogrid, geotextile or their combination. 9. A water management structure with a bottom surface made of loose material with a laid and stretched impervious cover for the surface of the earth, in which the impervious cover includes a large number of parallel laid geostrips (20) of elastic synthetic material, with folded side edges and wherein the geostrips (20) they are held by means of ballast material (22, 22A) in multiple trenches (14) that extend parallel to the ground surface (12,13) of the water management structure; a plurality of trenches (14) are anchoring trenches (14), each of which has one cavity formed with uniform contact surfaces with geotapes (20), indicated by the fact that said plurality of trenches (14) contains a first group of alternative trenches (14A) and a second group of alternative trenches (14B), in which each trench (14A) of the first group extends between the trenches (14B) of the second group of trenches; a larger number of geostrips (20) placed in an unrolled form transversely and/or longitudinally that bridge the specified first and second group of trenches (14A, 14B) and the geostrips (20) are laid and tightened by a process in accordance with patent claim 1; said geostrips (20) are maintained in a stretched state by means of first and second ballast material (22, 22A), in said first and second group of trenches (14a, 14b). 10. Device according to patent claim 9, characterized in that the drainage material includes: gravel, geogrid, geogrid, geomat, individually or in combination. 11. Device according to patent claim 9, characterized in that the layer (17) of filtering material includes: sand, earth, clay, lime, which are used individually or in combination. 12. Device according to patent claim 11, characterized in that the layer (17) of filtering material further contains geotextile, geogrid, geocomposite or their combination. 13. Device according to claim 9, characterized in that the ballast material includes: sand, gravel, earth, concrete or their combination. 14. Device according to claim 9, characterized in that the synthetic material of the geotape (20) is selected from the materials listed in the following table: [image] 15. Device according to claim 13, characterized in that the geotape (20) has a thickness between 0.2 and 40 mm and a modulus of elasticity between 10 and 5000 MPa. 16. Device according to claim 9, characterized in that the step (P) between the trenches (14A, 14B) is between four and ten times the maximum width of the trenches (L). 17. Device according to patent claim 9, characterized in that it contains additional geotapes (23) for covering the ballast material (22, 22A), which is hermetically connected to the geotapes (20).