Tubed wall for covering works of excavation hole and covering works manner null of excavation

摘要

PURPOSE:To enable the correction of rolling and the variation of the angle of rotation by displacing the positions of bolt inserting holes of front and rear ends by a fixed angle when a cylindrical wall for lining having a sectional shape point-symmetrical with respect to its own axis is connected. CONSTITUTION:A cylindrical wall A for lining is composed of RC segments 2... cylindrically incorporated along the inwall surface of an excavation pit having a sectional shape point-symmetrical with respect to its own axis. Bolt inserting holes 3a... for mutually coupling the cylindrical bodies A are formed to both end faces of each segment 2.... The inserting holes 3a... positioned at a rear end are placed at positions turned only by a fixed angle theta centering around the axis Z of the wall A to the inserting holes 3a... located at a front end at that time. The mutual walls A are connected by bolts, and the rear wall A is rotated only by a specified angle to the front wall A. The walls A are revolved successively up to desired angles by repeating the process.