Manner and its device null of internal finishing the centrifugal formation tunnel

摘要

PURPOSE: To smoothly finish the inner surface of a circular arc plate-shaped concrete liner by applying fine surface roughening processing to the surface layer of the concrete in a form after centrifugal compaction to form a rough surface and leveling the rough surface before subjecting the same to surface smoothing iron finish. CONSTITUTION: As a rod-shaped ring cutter 51, far example, a profile steel rod is used and the circular arc blade of the ring cutter 51 moves while shaves the surface of concrete to roughen the surface of the surface layer of concrete. Next, a rotary cylindrical roller 52 is pressed to the upper surface of concrete and once reciprocally moved by a feed device while axial reciprocal movement is applied to the upper surface of concrete. The rough surface of the surface layer of concrete is smoothly finished. Subsequently, a surface smoothing slide plate member 53 is axially reciprocated once in the feed direction while pressed to the upper surface of concrete to smooth the surface of concrete.