SU1673677A1 - Method for building antifiltration screen of dam - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to hydraulic construction, in particular, to the construction technology of dam, dam and embankment screens. The purpose of the invention is to reduce the cost of the screen. The method is implemented in the following sequence. The body of the dam is poured, on the screened surface of which a system of mutually perpendicular furrows of semicircular or trapezoidal shape is cut. Oil bituminous rocks are delivered and placed on the screen with preservation of the natural physical state of the rocks or mixed with mineral additives. The screen is laid of variable thickness, increasing towards the bottom of the dam in accordance with the proposed dependency. 1 hp f-ly, 1 ill.

Description

The invention relates to hydraulic construction and can be used to create screening screens for dams, dams and embankments made of ground materials.

The purpose of the invention is to reduce the cost of the screen.

The drawing shows a soil dam with a screen.

The dam includes body 1, on the upper slope of which a system of mutually perpendicular grooves 2 is made, an antifiltration screen 3 and a protective layer 4.

The method is implemented in the following sequence. First, the soil body 1 of the dam is poured. A system of mutually perpendicular furrows 2 of semicircular or trapezoidal shape is then carried out on the uphill slope with the help of cats of the corresponding profile. After that, 3 nephitebituminous rocks are delivered and screened while preserving

their natural physical condition or mixed with mineral additives. After sealing the screen, the protective layer 4 is made.

Laying of petrobituminous rocks (kirs) with fluidity in their natural state, which is determined by the degree of bitumen content and the ambient temperature, is carried out using road-building equipment (drum-type mixing plants, dump trucks, bitumen trucks, excavators, lift trucks, motor graders and trailed graders, self-propelled rollers and motor rollers, road mills, etc.). The technology of filling, laying, maintaining and leveling Kirov of variable thickness on inclined surfaces has been sufficiently developed and is widely used in the practice of road construction.

The presence of grooves contributes to the stability of the screen due to development

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J

Os

vj 00 o vj vj

surface adhesion of its material with the material of the slope of the dam. Filling the grooves with gravels due to the fluidity of the latter in the natural or heated state does not present any technical difficulties, and since the surface areas in the layer applied to any two-phase cyr material harden faster, the formation of a gradually thickening or thinning coating is also real and technologically proven.

Lime, slag, ash, and other materials can be used as mineral additives in petroleum-mineral rocks.

The thickness of the impervious screen is variable and increasing towards the bottom of the dam. Studies carried out for a fairly wide range of changes in the characteristics of oil-bitumen-containing rocks allowed us to establish a relationship for determining the optimum screen thickness (h)

h h0 + K L sin a,

lower construction costs, as local natural raw materials are used for the screen device.

Claims (2)

1. A method for constructing an anti-filtration screen of a dam, including dumping the dam body, delivering a low-permeable material and placing it on the screen, and also filling a protective layer, characterized in that, in order to reduce the cost of the screen, delivery of low-permeable materials used as oil-bitumen rocks , carried out with the preservation of their natural physical state, and the screen is laid with the preservation of the natural physical state of bituminous rocks or mixed with mineral minerals. in addition, the screen is made of variable thickness increasing to the bottom of the dam in accordance with the dependence h h0 + K L sin a, where h0 is the thickness of the screen on top; K - coefficient taken to be 0.012 ... 0.017, depending on the composition and properties of petite-bituminous rocks; L is the length of the screen; a - the angle of the screen to the horizon. The effectiveness of the method lies in the fact that the use of a layer of petroleumiferous rocks as an impervious material with the preservation of their natural qualities, enhanced by mineral additives, causes an increase in the performance of the impervious screen of the dam and where h0 is the thickness of the screen on top; K is a coefficient taken to be 0.012 ... 0.017, depending on the composition and properties of oil bituminous rocks: L is the length of the screen; a - the angle of the screen to the horizon. 2. The method according to claim 1, wherein that, on the surface of the screened dam body, before the screen is installed, a system of mutually perpendicular furrows of a semi-circular or trapezoidal shape is performed.