Cutting edge of jacking method for box-body

摘要

(57) [Abstract] OBJECTIVE a simple structure and without even take place, economically face and the natural ground can be stabilized. [Configuration] established the box-body 1 ₁ 1st of having a hood-shaped blade opening 3 at the tip, it is boring the first Jaco body 1 ₁ Promoting jack, this 1st backward Jaco body 1 ₁ In the second the following jacking method that is boring the box making body in the ground to build the underground structure is in a tandem state the box-body are sequentially installed in the blade opening 3 Was a saw-like is a continuous shape of the tip edge recess 9 and the convex portion 10.