The construction method should be constructed according to the environment.
Already 9 years old mountain construction A place that comes out after about 40 minutes along the trailIn 2010 ♡The facility was assigned to the site manager for the collapse of the civil engineering retaining wall, and the site surveyed it. Because it collapses without barrier, the input material is sorted and the water is easily drained, and safety is secured by configuring it in two stages rather than in one stage.