RU2523503C1 - Stone dam with inner impervious screen made of soil-cement-concrete - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: stone dam contains impervious element in the form of soil-cement-concrete screen covered with film. The screen is recessed under the upstream face of the dam. It is designed as an inclined plate, leaned via the inclined sliding seal on the concrete prism. Near the bottom border of the soil-cement-concrete screen there are galleries. They are located every 20-40 m of height and serve to control the status of the screen and for its repair. Reinforced concrete gallery for cementation of rock base is arranged on the contact of concrete prism with rocky foundation.

EFFECT: increase of reliability of impervious element, ability of dam work in the conditions of extreme low temperatures, dam repair without draining the storage reservoir.

1 dwg

Description

The claimed technical solution relates to the field of hydraulic engineering.

In the prior art, stone-filling and stone-filling dams with a reinforced concrete screen, built abroad.

An example of such dams is the Foz do Areia dam and the Segredo dam [1]. In these dams, a reinforced concrete screen, which is made of reinforced concrete slabs, is laid on the crushed stone preparation.

The disadvantages of this technical solution are: a high probability of cracks in the impervious element and, accordingly, a high probability of its failure, the potential for destruction of the upper part of the screen from the effects of negative temperatures and ice, low maintainability.

Closest to the claimed technical solution is a rock-fill dam with buttresses on the pressure surface and enclosed between buttresses and the prism of the thrust plate of the screen SU 1258937 09/23/86 [2].

The disadvantages of this technical solution are the destruction of the upper part of the shield plates from the effects of negative temperatures and ice, the complicated workflow, the impossibility of independently constructing a thrust prism and buttress with the shield plates, the possibility of cracks at the lower marks of the buttress, the violation of the waterproofness of the perimeter weld seal due to its opening, the need to empty the reservoir to repair the screen.

The task to which the invention is directed is to increase the reliability of the anti-filter element, the ability to operate a soil dam at extremely low temperatures, to repair a soil dam without emptying the reservoir, and to increase the economic efficiency of its application.

The specified technical result is achieved by using as a main anti-filtration element a thick screen made of cement cement with placement in it, every 20-40 meters in height, galleries to monitor the condition of the screen and to repair it by injection of cement mortars, if necessary, to deepen the screen in the body of the resistant prism to protect against negative temperatures and ice, as well as supporting the screen on a concrete prism through an inclined sliding seam, which allows the screen to follow Reformation thrust prisms without causing significant disclosure perimeter seam. The top face of the cement-concrete screen is covered with an additional anti-filter element in the form of a film (geomembrane). At the contact of the concrete prism with the rock base, a reinforced concrete gallery is provided for cementing the rock base.

The invention is illustrated by the drawing, which shows a section of a stone dam with a cement-cement concrete screen in the direction from the upstream to the downstream.

The film 4 (for example, a geomembrane made of polymeric materials with a thickness of at least 6 mm) is located on the upper edge of the cement-concrete screen 2, which, in turn, is located in the body of the resistant prism 1. A protective layer of sand-gravel mixture 3 is laid on top of the film 4. At the base of the screen there is a concrete prism 5, on which the screen 2 rests. At the contact of the concrete prism with the rock base, a reinforced concrete gallery 6 is arranged for cementing the rock base. Also, near the bottom face of the cement-cement concrete screen 2, galleries 7 are arranged every 20-40 m in height.

The proposed design of a high stone dam with a cement-concrete screen works as follows.

After the dam is built and the reservoir is filled, the soil-cement concrete screen under the influence of hydrostatic pressure follows the deformations of the resistant prisms without violating the water resistance, which is achieved:

- deepening the screen deep into the resistant prisms (which provides a favorable temperature regime of the screen),

- free displacement of the screen along the inclined face of the concrete prism,

- the presence of a "spare" antifiltration element (film).

Thus, in the proposed design of a high stone dam with a cement-concrete screen provides high water resistance due to the creation of two waterproof circuits. By changing the screen operation scheme, a significant improvement in its stress-strain state is achieved. It also provides high maintainability by placing viewing galleries along the entire height of the screen. Thus, high reliability of the dam is achieved.

Information sources

1. Yu.P. Lyapichev. Design and construction of modern high dams, p.208, Moscow, RUDN Publishing House, 2004

2. http://wwwl.fips.ru/ Open registry of the official website of the “Federal State Budgetary Institution Federal Institute of Industrial Property”.

Claims (1)

A stone dam with an anti-filtration element in the form of a screen, characterized in that the screen is deepened under the pressure side of the dam and is a thick inclined slab made of cement-cement concrete, supported through a slanting sliding seam on a concrete prism covered with a film, and at the contact of a concrete prism with a rock base, a reinforced concrete gallery for cementing the rocky base and near the bottom face of the cement-concrete screen every 20–40 m of height, galleries are arranged to monitor the condition of the screen and for go repair.