PROBLEM TO BE SOLVED: To determine a force-feed allowable distance in a state where quality is secured while an actual piping distance is simulated at low cost.SOLUTION: A concrete pump pumpability evaluation method includes an inflow process in which concrete is flowed into a pipe 10 and a force-feed process in which concrete is subjected to reciprocation moving between a first point A and a second point B in the pipe 10 alternately using force-feed means 20 installed at both ends of the pipe 10, respectively. In the force-feed process, concrete is continued to be force-fed until a closed state where flowability of the concrete becomes a constant value or smaller in the pipe 10 while the force-feed means 20 measures the number of force-feeding, and a force-feed allowable distance is calculated from the number of force-feeding when a closed state occurs. In the force-feed process, a pressure within the pipe 10 is measured and it is preferably determined that the closed state occurs when the pressure within the pipe 10 exceeds a prescribed pressure.SELECTED DRAWING: Figure 4
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