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Date of Publication:2001-01-01

Journal:水力发电

Volume:1

Issue:1

Page Number:42-44

ISSN No.:0559-9342

Abstract:For the hydropower station with the powerhouse at the dam toe,there is no expansion section of the pressure steel pipe at the juncture between the powerhouse and the dam but a cushion structure should be set up in some section of the pressure steel pipe to adapt to the deformation of the pipe under the action of loads, which is an effective way. On the basis of the three-dimensional finite element calculations on a large-sized hydropower station, we gained the deformations and stresses of the pressure steel pipe with cushion structure between powerhouse and dam under the action routine loads. According to the analysis on the calculation results and in order to improve the stresses of such cushion str ucture, the author suggests that the elevation of joint concrete between powerho use and dam should be enhanced to make the powerhouse and dam jointly bear the stresses. The length of the steel pipe with cushion structure should be increased as possible. The welding of last ring joint of the pressure steel pipe between powerhouse and dam should be delayed as possible, and the upstream water level of reservoir also should be increased as possible before the welding. At this time, the non-uniform settlement caused by the dead weight of powerhouse and dam has been basically finalized and the stresses on the cushioned steel-pipe caused by the load of the stored water of reservoir could not be increased.

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