| 摘要 |
PURPOSE:To prevent the deformation of a stay ring by pouring the pressurized water into the inside of a spiral case and of a stay ring partitioned by a partitioning wall formed onto the inner and outer peripheries of the stay ring. CONSTITUTION:A partitioning wall 7 is installed onto the outer periphery between the upper main plate 1a and the lower main plate 1b of a stay ring 1, and assembling of a test ring 3 and the installation of the test ring 3 onto the stay ring 1 by bolts are carried-out. each water pressure P2, P1 is released, and after water discharge, the test ring 3 is disassembled, and burying work is completed. Therefore, the deformation in the negative direction for the stay ring can be converted to the deformation in the positive direction, and deformation can be prevented. |
