PURPOSE: To exactly and easily know Lugeon values by displaying Lugeon value or unit injected amount of cement by hole, depth of the hole, and section divided at a fixed interval by light or thick spots or lines.

CONSTITUTION: In a grouting construction management chart for curtain grout, Lugeon value in the injection hole on the left side of the chart is displayed by hole and section groups. The ports of the holes are leveled with each other at the same height regardless of the height difference of the injection ports and displayed graphically without providing apertures between the injection ports. In the chart on the right, Lugeon values are displayed in a gradually increasing series of the concentration and compared with the chart of the left to know Lugeon value between the sections. Since Lugeon value can be easily known, the distributing condition of grout in unimproved section can be easily and exactly obtained for judging the grouting effects.