| With this series of machines , the concrete tubes with specifications of 200-1000mm can be produced by using pulverized coal ash, slag,sand and crushied stone pulsing little quantity of cement. The tube produced with this series machines are even in their wall thickness, smooth on surface, high in compression strength, convenient and firm in connection, and excellent in anti-seeping , which are widely used in agricultural irrigation and draining projects in cities. | 
