Guide assembly for guiding casing and method for forming sheathing wall

The invention discloses a guide assembly for guiding a casing and a method for forming a sheathing wall. The guide assembly includes: a first guide-body having first inner and outer vertical faces andfirst top and bottom horizontal faces, wherein the shape of the first inner face is configured to make a plurality of first round concave portions extending vertically be arranged along a length direction and connected with each other; a second guide-body having second inner and outer vertical faces and top and bottom horizontal faces, wherein the shape of the second inner face is configured to make a plurality of second round concave portions extending vertically be arranged along a length direction and connected with each other; at least one first coupling unit configured to couple the first and second guide-bodies to each other at the first and second top faces thereof; and at least one second coupling unit configured to couple the first and second guide-bodies to each other at lower positions of the first and