SETTLEMENT SHAFT COMMON TO MANHOLE, ITS CONSTRUCTION AND CYLINDRICAL SETTLEMENT SHAFT BLOCK

摘要

PURPOSE: To provide an economical and rational settlement shaft which has a good workability suitable for application of a small diametral propulsive pipe and does not hinder traffic. ;CONSTITUTION: An installation area of a vertical shaft is excavated to set a cutting block 1 and a cylindrical settlement 2 is jointed thereon. The inside is excavated while the upper cylindrical recessed blocks are jointed by turns, to reach a specified depth. A temporarily soil-retaining member 3 is placed on the uppermost cylindrical settlement block 2 to make a vertical shaft for application of propulsive pipes. After the propulsive pipes are completely laid down, a floor slab block 4 having a specified opening 4a is placed on the uppermost cylindrical settlement block 2. A block 5 for manhole is erected on the opening 4a and filled back at the periphery to use as a manhole.;COPYRIGHT: (C)1994,JPO&Japio