Repairing export silos at a coal mine

摘要

The reinforced concrete silos are approximately 31.5m tall by 15.5m in diameter, with 25omm-thick walls and a capacity of 3000 tonnes of coal each. Reportedly, less than 12 months after construction, vertical cracks were noticed on the external faces of the silos and post-ten-sioned steel cables were installed to prevent further cracking and to provide additional lateral restraint to the walls of the silos during coal loading operations.