Publications / 1992 Proceedings of the 9th ISARC, Tokyo, Japan
This system offers automated and labor-effectiveness environment in the site control of shotcreting on NATM method tunnel work; and also reduces QSCA (quick setting cement additive).The total control of Spraying robot; Conveyer-pump of concrete and Supply-system of quick setting cement additive enables automatic shotcreting by setting the proper quantity of cement and QSCA beforehand.This system reduces of the rebound shotcrete and QSCA by adding the most proper volume of QSCA to the working area.Therefore it more able to save the cost of construction than usual methods. Moreover, Homogeneous shotcreting is available by controlling the volume of QSCA in accordance with the measured value of the height of the blowing area and output quantity concrete from conveyer-pump.