Along with supplying car Back hoe to install head punch extract. Start drilling to extract stone in the March 23, 2015 between the drilling to extract stone found that the stone floor Grid Line 2, 3, 4 are estimated over strength. It allows extraction of penetration is delayed. Consistent with the evaluation report of the stone, for example, indicate that these stones are Average Compressive Strength 399 kg/sq.cm., which has a value higher than typical concrete.
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