SU1167259A1 - Arrangement for enhancing the stability of concrete dams - Google Patents

Abstract

A DEVICE FOR INCREASING THE STABILITY OF CONCRETE DAMS, including an anchor at the base of the dam and a tension mechanism on its crest, characterized in that, in order to improve the operating conditions of the device and reduce the cost of the dam structure, it is provided with a vertically arranged wand, made in the form of buried under the upper level the pool of tanks filled with gas, a flexible link and a swivel block fixed to the anchor, and a flexible link, turning a rotary block, is connected to a beater and tensioning mechanism, the anchor being located is lying on the side of the headwater. o :) 1C cd with

Description

The invention relates to hydraulic construction and can be used to increase the stability of concrete dams.

A device is known for improving the stability of a concrete dam, in which the reinforcement of the upper edge of the dam, which does not adhere to concrete over its entire length, is anchored by the ends into the structure, with parts of the structure in which the anchor ends are separated from each other by a through seam. The upper part of the dam is erected in relation to the design position with some inclination towards the reinforcement. The slope is provided by appropriate temporary devices, for example a layer of sand. After the required time has elapsed, the sand is removed, the upper part of the dam comes to the design position, and the reinforcement is tensioned. The reinforcement is then coated with a protective layer and cementation of the seams (1.

This device has the following disadvantages: the need for the device channels in the base plate; the complexity of the formwork horse face dam; the possibility of disturbing reinforcement releases during the construction period, as well as the great difficulty of creating an inclination of the upper part of the dam and the subsequent removal of temporary devices providing it.

The closest in technical essence to the present invention is a device for improving the stability of concrete dams, including an anchor at the base of the dam and a tension mechanism on its ridge. In this technical solution, compression of the pressure face is carried out with the help of weights located outside the body of the dam and carried to the upper reach. The trays anchor one end into the base, and the other end into the dam crest, thereby simplifying the work and providing the ability to control and inspect the pre-stressed reinforcement 2.

The disadvantages of this device are the necessity of prestressing and regular monitoring of the forces in the loads and its periodic restoration, as well as the difficulty of restoring the device in case of any damage. All this determines the complexity of the operation of the device and the high cost of dam construction.

The purpose of the invention is to improve the operating conditions of the device and reduce the cost of dam construction.

The goal is achieved by the fact that the device for improving the stability of concrete dams, including an anchor in the base of the dam and a tension mechanism on its crest, is provided with a vertically positioned arm, made in the form of tanks buried beneath the level of the upper reach,

filled with gas, a flexible link and a swivel block fixed to the anchor, and the flexible link, the bend of the swivel block, is connected to the arm and tensioning mechanism, the anchor being located on the side of the upstream pool.

0 FIG. 1 shows a section A-A in FIG. 2 (on the device and the dam); in fig. 2 - view B on fng. one.

A device for improving the stability of concrete dams includes an anchor 1 at the base of dam 2 and a tension mechanism 3 on the crest of dam 2. A barrel 4 of tanks 4 that are buried below the level of the upstream (UVB) is filled with air. Through the flexible coupling 5 and the swivel block 6. fixed on the anchor 1, the arm of the containers 4 is connected to the tensioning mechanism 3. The anchor 1 with the swivel block 6 is moved to the side of the upstream.

The device is located at the horse face of the dam and works as follows. By means of a tensioning mechanism, 3 arms of the tanks 4 are buried under the level of the reservoir and create the force required for anchoring the dam 2 to the base. With fluctuations in the level of the reservoir, the degree of tension of the flexible connection 5, and hence the force anchoring the dam, changes. The barrel of containers 4 also serves to protect the dam from wave and seismic effects. When repair works are required, the operation of the tensioning mechanism 3 is stopped, and a barrel of tanks 4 floats to the surface of the reservoir.

The proposed device in comparison with the prototype provides the following technical and economic advantages:

when repair work is necessary, the tensioning mechanism stops working and a tank of tanks rises to the surface of the reservoir;

Arm NDA tanks also serves to protect the dam from wave and seismic effects;

 due to the inclination of the flexible connection towards the upstream, retention force is more efficiently used.

In general, these advantages can improve the operating conditions of the device, as well as reduce the cost of the dam design by reducing the amount of concrete consumed during its construction.

The economic effect from using the proposed technical solution only at the Mokskaya HPP is 504,000 rubles.

FIG. 2

Claims (1)

DEVICE FOR INCREASING STABILITY OF CONCRETE DAMS, including an anchor in the dam base and a tension mechanism on its crest, characterized in that, in order to improve the operating conditions of the device and reduce the cost of the dam structure, it is equipped with a vertically arranged garland made in the form of tanks buried below the level of the upper pool filled with gas, a flexible connection and a rotary unit fixed to the anchor, and a flexible connection, circling the rotary unit, is connected to a garland and a tension mechanism, and the anchor is located with on the side of the upper pool. <Rig-1