PURPOSE: To reduce construction cost by constructing a soil cement pillar row landslide protection wall, executing ground anchors, keeping intervals, in eccentricity on the shoulder surface side of the landslide protection wall, and applying the initial compression stress on the soil cement pillar row landslide protection wall.

CONSTITUTION: A cement group mixed muddy liquid as poured liquid is mixed and stirred with the original position soil, and the core members consisting of H steel, etc., are inserted, keeping an interval, into the excavated holes which are overlap-bored, and a soil cement pillar row landslide protection wall I is constructed. Then, the concrete 3 for connecting the top parts in which anchor sleeves 2 for ground are embedded is placed, and anchor holes are drilled up to a supporting layer through the sleeve 2. Then, a PC steel wire 4 is arranged in the hole, and the gap is grouting- processed and solidified. The steel wire 4 is tightened, and tightened by the concrete part 3, and the initial compression force is generated on the shoulder surface of the landslide protection wall I, and the deformation of the landslide protection wall I is suppressed, and then the excavation ground side is excavated. Accordingly, the rationalized construction method such prefabricated construction and mechanical construction can be adopted, without using a horizontal cut beam, and cost can be reduced.