合面狮水力发电厂坝后引水管加固方案分析OA

After many years of operation,the diversion penstock of Hemianshi Hydropower Plant experienced crack-ing and water seepage.Although chemical grouting treatment was carried out,the seepage continued.Based on field observation and computational verification,temperature stress was identified as the principal causes responsible for the penstock concrete cracking.The cracks were mostly longitudinal(in the direction of water flow),with transverse cracks being relatively infrequent,and a large amount of white calcium precipitate was found on the crack surfaces,indicating safety risks and affecting the safe operation of the power plant.Therefore,urgent reinforcement of the pen-stock is necessary.Two options were compared,namely installing an internal steel liner versus demolishing and re-building the penstock,and the demolition and reconstruction option was ultimately chosen.