Transformation structure and method of dam foundation draining hole of dam of hydroelectric station

Abstract

The invention discloses a transformation structure and method of a dam foundation draining hole of a dam of a hydroelectric station. The transformation method of the dam foundation draining hole of the dam of the hydroelectric station comprises the following steps that (1) the foundation uplift pressure at the position of the dam foundation draining hole is measured; (2) when the foundation upliftpressure is larger than a design value, a groove is carved in original concrete in the axial direction of an original horizontal draining pipe, and the original horizontal draining pipe is disassembled; (3) backfilling is conducted on the carved groove with cement mortar, plastering is conducted on the two sides and the bottom of the groove with cement mortar, and a drainage ditch is formed; (4)hole bottom cleaning treatment is conducted on the original draining hole; (5) an auxiliary draining hole is additionally arranged at the position where the foundation uplift pressure is larger than adesigned value, a t-branch pipe is installed at an opening of the upper end of the auxiliary draining hole, an end cap is arranged at an upper end opening of the t-branch pipe, and the other end opening of the t-branch pipe is connected with the drainage ditch through a pipeline. According to the transformation structure and method of the dam foundation draining hole of the dam of the hydroelectric station, an existing dam foundation draining hole is transformed, especially the auxiliary draining hole is additionally arranged beside a blocked draining hole, so that the blockage problem of vadose water is effectively solved, the dam foundation uplift pressure is reduced, and stable operation and safety of the dam are guaranteed.

Description

technical field [0001] The invention relates to a hydropower station dam foundation drainage hole reconstruction structure and method, and belongs to the technical field of hydropower station dam foundation reconstruction. Background technique [0002] Guizhou Suofengying Hydropower Station is located in the power load center in the hinterland of central Guizhou. The main task of the project is to generate electricity, undertake tasks such as peak regulation, frequency regulation, and emergency backup, and also have benefits such as irrigation, breeding, and tourism. The installed capacity of the power station is 600MW, the guaranteed output is 466.9MW, the annual average power generation is 2.011 billion kw.h, and the annual utilization hours are 3352h. [0003] The foundation rock of Suofengying Dam is the Yulongshan Limestone of the Lower Triassic Liquid Lang Formation, which is hard and complete. The strike of the rock strata is NE and crosses the valley and dips upstrea...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to provide a hydropower station dam foundation drainage hole reconstruction structure and method to solve the problem of calcification and precipitate blockage during the long-term operation of the existing dam foundation drainage method, reduce the dam foundation uplift pressure, Ensuring the stable operation and safety of the dam

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