Old dam dismantling method

Abstract

The invention provides an old dam dismantling method. The old dam dismantling method is characterized in that an old dam body is reserved, for the part, to be dismantled, of an old dam, the downstreamside is blasted to the height to be dismantled, an upstream side water retaining ridge is reserved, site arrangement and slag backfilling are conducted between the new dam and the old dam before water filling and storage, an apron is manufactured, the space between the apron and a dam toe is filled with large rock blocks, a stilling pool is formed, then the water retaining ridge is dismantled step by step, and water is stored for the new dam step by step. The water retaining ridge dismantling method comprises the steps that (1) the water retaining ridge dismantling elevation is determined; (2) transverse partitioning is conducted, each block is blasted longitudinally in a graded mode, and the blasting direction is from the upstream to the downstream; (3) the blasting height and width aredetermined, and the water flow is limited; and (4) when all safety indexes of the new dam are stable, the reserved water retaining ridge which is not dismantled is dismantled to the designed dismantling height. The old dam dismantling method has the advantages that the size of a notch is easy to control, the situation that large water flow occurs when the dam is dismantled in a large area, and consequently downstream building facilities are damaged is prevented, and the potential energy of water filling of the water retaining ridge is reduced through the apron.

Description

technical field [0001] The invention belongs to the dismantling of old dams, and is especially suitable for the dismantling method of old dams after new dams are built. Background technique [0002] The domestic water conservancy industry has developed rapidly. In recent decades, the construction of domestic hydropower stations has gradually become saturated. There is no precedent for the demolition of large-scale dams in China. Most of them are renovation and maintenance of old dams. As the service life of domestic dams is getting longer and longer, only maintenance can no longer fundamentally solve the safety hazards of old dams, so the demolition of dams is an inevitable fact, and the technology of domestic dam demolition needs to be further improved. However, where the old dam is located is a place with abundant hydraulic power, a new dam will generally be built in front of the old dam (that is, downstream), which puts forward higher requirements for the removal of the o...

AI Technical Summary

Problems solved by technology

As the service life of domestic dams is getting longer and longer, only maintenance can no longer fundamentally solve the safety hazards of old dams, so the removal of dams is an inevitable fact, and the technology of domestic dam removal needs to be further improved

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