SU896170A1 - Lining of underground turbine water duct - Google Patents

Description

(54) COVERING UNDERGROUND TURBINE WATER

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The invention relates to hydraulic engineering, namely to turbine water lines of hydropower plants (HPP and PSPP).

Lining of turbine conduits of hydropower plants is known, comprising an outer concrete ring and an inner steel shell 1.

The disadvantage of this lining is its greater stiffness, as a result of which, when closing, the direction of the yush, its apparatus of the HPS unit, or its sudden stop, arises, its hydraulic impact has a large value.

A turbine conduit lining is also known, comprising an outer concrete ring and an inner thin-walled corrugated shell 2.

The disadvantage of this lining is also the inability of it to absorb hydraulic shock.

The aim of the invention is to reduce the hydraulic impact in the conduit during the operation of a hydroelectric power station.

The goal is achieved by applying a layer of elastic porous material on the outer surface of the corrugated shell.

The drawing shows a turbine conduit, a cross-section.

The lining of the turbine conduit includes an outer concrete ring 1 adjacent to the surface 2 of the excavation in rock 3. On the inner side of the lining there is a steel jacket 4 with longitudinal corrugations 5 directed toward the rock. Between the casing 4 with corrugations 5 and the concrete ring 1 there is a gasket 6 of elastic porous material, for example, of porous rubber.

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The lining is performed as follows.

Production 3 passes in the rock 3. The shell 4 is made in an assembly-welding conductor from individual rings made of soft steel of structurally minimal thickness (5-12 mm). The casing 4 with the gasket 6 is fixed in the concrete ring 1 by anchors, the number of which and the design is determined by pressure on the groundwater, and in their absence, by design considerations. In the case of

Claims (2)

20 where necessary, drainage is used to relieve the lining from groundwater pressure (in the drawing, anchors and drainage are not shown). The casing 4 is sectioned with detachable mounting rings that have been fixed from the inside out, are transported to the excavation 2, installed in the design position, and the annulus is filled with concrete. After it has set, the removable mounting rings are removed. The efficiency of the lining operation is provided by increasing the deformation of the walls of the conduit, which reduces the magnitude of the hydraulic shock, the limit of which is determined by the influence of the elastic deformations of the water itself and the walls of the conduit. In the device, the gasket 6 and the corrugations 5 allow the required calculated amount of radial deformation of the shell 4 to be ensured and without breaking its tightness, which is necessary to relieve the water hammer, which reduces the cost of the lining and increases its operational reliability. Claims The lining of an underground turbine conduit comprising an outer concrete ring and an inner thin-walled corrugated shell, characterized in that, in order to reduce water hammer in the conduit during the operation of a hydroelectric power station, a layer of elastic porous material is applied to the outer surface of the corrugated shell. Sources of information taken into account in the examination 1. Instructions on the design of hydraulic tunnels, CH 238-73, M., Stroyizdat, p. 18. 2. Gubin F. F. et al. Hydroelectric stations. M., “Energie, 1972, p. 393 and 411.