Hinged arch structure of rolled concrete arch dam

Abstract

A hinged arch structure of rolled concrete arch dam is constituted through such steps as making the grouting seam and hinging well on the transverse seam of said arch dam and near the upstream cooling region, burying water-stop plates, grout-lifting pipes and grout-stop plates in said grouting seam, back-filling expansive concrete in said hinging well, and arranging grouting system at the edge ofexpansive concrete plug and in transverse seam for later-phase grouting. It features that said arch dam can play its arch role before the transverse seam is grouted and sealed and the cooling stress of the arch dam at downstream surface can be released.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, in particular to the design of the hinged arch structure of a roller compacted concrete arch dam. Background technique [0002] The normal concrete arch dam mainly relies on the arch action to transmit the hydraulic load to the foundation on both banks, and partly transmits the hydraulic load to the rock foundation of the river bed at the bottom of the dam through the action of the vertical section cantilever beam. The arch dam is an overall statically indeterminate structure fixed to the bedrock. After the concrete is poured, the internal temperature of the concrete rises in the early stage, and the surface heat dissipation temperature is low. cause cracks. In order to prevent temperature cracks, traditional concrete arch dams have been poured in blocks by columnar method during the construction period. Transverse joints are set every 15-20m along the arch axis, and can be...

AI Technical Summary

Problems solved by technology

[0004] Among them, some roller compacted concrete arch dams have no joints, and use the whole warehouse surface for rolling. The arch effect can be formed after pouring, and the water is stored in advance without waiting for long-term cooling. It moves inward and becomes a penetrating crack; some RCC arch dams have artificial induced joints, but the penetrating joints (28m long) did not pass through the induced joints during the initial temperature drop, and no grouting measures were set around the induced joints. Repeated grouting for many times; some RCC arch dams use conventional transverse joints, cooling down while pouring, and the dam body has been cooled and grouted after 3 years, without induced joints, but the construction period is longer

Images