QUALITY CONTROL AND QUALITY ASSURANCE MANAGEMENT IN UPPER-KOTMALE HYDROPOWER PROJECT

摘要

Upper-Kotmale Hydropower Project has been constructed at the southern highland of Sri Lanka from 2007 to 2013. This project has 150MW capacity and it composed a dam with a height of 35.5m and a crest length of 180m, a headrace tunnel of 4.5m in diameter lined and unlined and 12.89km in length, a surge tank with 12m diameter and 98m height, a penstock formed by an underground incline shaft starting with a diameter of 4.5m and reducing to 1.45m and 793m in length, an underground powerhouse with dimensions of 66.3m L x 18.8m W x 36.5m H, an outdoor switchyard and other facilities. Approximately 300,000m3 of concrete have been used for this project.This report introduced the management systems for quality control and quality assurance for concrete and other materials. Very careful quality control has been required due to wide variation of raw material quality for construction. Author has constructed the quality control and quality assurance management system and organized the QAQC team. Continuous education and training for team staffs have been carried out to ensure the technical level of testing. All manufacturing records have been input and checked daily. Even these efforts for quality control were carried out, but some quality failures have been observed. These failures are also introduced as case studies in this report.