Optimization Design of Branch Pipe in DAPEIN (I) Hydropower Station
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Abstract:
According to the engineering design and geological conditions of the pressure pipe in DAPEIN (I) hydropower station, two types of bifurcation pipes were chosen including the buried type steel bifurcation pipe and reinforced concrete bifurcation pipe. Three-dimensional numerical analysis models were developed for both types of bifurcation pipes and model results were compared from the aspects of the bifurcation pipe position, bifurcation pipe size design, and stress and deformation. The results showed that the wall rock of the steel bifurcation pipe is grade IV, which has relatively poor conditions. The stresses on the shell and wall of steel bifurcation pipe are high, and the pipe has complexity of welding technology, difficulty in construction, and high cost. The wall rock of the concrete branch pipe is grade II~III. The concrete branch pipe uses the "Y" type structure with concentrated stress near the bifurcation, and double reinforced concrete is used. The wall rock needs the consolidation grouting and backfill grouting treatments.
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