SU1348446A1 - Counter-seepage film screen - Google Patents

Abstract

The invention relates to the field of hydraulic engineering and can be used in the construction of dams that enclose the reservoir from the adjacent territory. The purpose of the invention is to reduce labor costs and increase the reliability of operation at two-sided / low drop in water levels. The film panel of the screen is made of transverse strips 6 along the riverine placed within the body of the dam 3, enclosing the reservoir 1 on the side of its upper slope 4. The lower end portion of each upstream strip is overlapped on the upper end portion of the downstream strip. The ends of the strips can be placed with a slope less than the slope of their mid-sections. When the water level in the pond rises, the water through the upper layer of the uphill slope 4 filters to the lanes 6 due to the pressure created by the water pressure from the upstream side. The lower end portions of the strips 6 are pressed against the upper ones, which eliminates water leakage. When the pressure from the enclosing areas 2 water filters through the gaps between the end sections of the panels in the reservoir 1. 1 3.p. f-ly, 5 ill. - / s (O (L 00 4 CX) 4 4 o: // //. Figure 1

Description

The invention relates to hydraulic engineering construction and can be used in the construction of anti-filtration devices of dams, in case of reservoirs and employees for the protection of territories.

The purpose of the invention is to reduce labor costs and increase reliability of operation with a two-way drop in water levels.

Figure 1 shows the dam, a cross section; figure 2 is a fragment of the end sections of the film screen with the pressure from the upper side and with a maximum slope that coincides with the overall slope; fig.Z - the same, when the pressure from the lower side; figure 4 - the position of the strips of the film screen when placing their end sections horizontally when the pressure from the upper side; fig.Z - the same, when the pressure from the lower side.

A dam for fencing a reservoir 1, for example, a river or a reservoir, from adjacent territories 2 includes body 3 made of local materials, such as soils or stones, with uphill slopes 4 on the water side and downstream slope 5 on the side of adjacent territories 2 In body 3 dams on the side of the reservoir 1 there is an anti-filtration screen of a film sheet formed of transversely placed transverse strips 6. The lower end section 7 of each upstream strip is placed overlapping above the upper end section 8 laid band. In general, the overall screen of the anti-filtration screen, formed by the lengthyly placed strips 6, is located in the direction of the lower slope with a slope that may coincide or slightly differ from the slope of the upper slope 4 of the body of the dike 3. The strips 6 can be completely placed in the direction of the slope plates, but preferably the lower and upper end sections 7 and 8 should be placed with a smaller slope from the horizontal than the slope of the middle sections, this ensures reliable pinching of the strips in the ground and increases the stability of the upper slope 4. In this case, the slope of the end sections 7 and 8 of the panels can vary from the angle of the overall slope of the screen (Fig.) to their horizontal position. Position 9 indicates the maximum water level in the reservoir.

The device works as follows.

When the water level in the reservoir increases, for example, during the flood period, the water through the upper layer of the upper slope 4 filters to the strips 6 due to the pressure created by the water pressure from the upper side, presses the lower end sections 7

lanes 6 to the upper end sections 8 placed under them, which excludes water penetration through the body of the dam 3 towards the downstream side and thereby prevents water from leaking out of the reservoir, ensuring reliable protection of the adjacent territories from filtration water.

Flood water level in the reservoir

it happens twice a year for a short period, and since the level of the territories adjacent to the reservoir is above the bottom of the reservoir, then basically the level of 10 ground waters will be higher than the average level of 11 reservoirs. Water is discharged into the reservoir in the event of pressure creation from the lower side, for example, when precipitation falls or leakage occurs from the networks, i.e.

the total groundwater level of the adjacent territories will be higher than the level 11 of the reservoir water: the infiltration waters pass through the body of the dam to the strips 6 of the flexible cloth and due to

water pressures from the lower side penetrate between the end sections 7 and 8, as if moving apart their stripes, and further through the soil layer of the upper slope 4 are discharged into the reservoir 1.

Pho. rmula of invention

Claims (2)

1. Anti-filtration film screen, mainly for dams, enclosing the reservoir from the adjacent Territory # 1 area, including a panel placed in the body of the dam from the upstream side of the reservoir with a slope to the lower side, differing the fact that, in order to reduce labor costs and increase the reliability of work with a two-way difference in water levels, the panel of the film screen is made of 313D8446 transverse bands, with the lower the end portion of each upstream strip is overlapped over the upper end portion of the downstream strip. 2. The screen according to claim 1, characterized in that the overlapped end sections of the strips are placed with a slope less than the slope of their middle sections. Phie. 2 . J fut. f Editor L. Veselovska Order 5171/29 Circulation 606 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5  II Production and printing company, Uzhgorod, Projecto st., 4 FIG. five Compiled by N.Kaveshnikov Tehred L. Serdyukova Proofreader M. Pojo