| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vertical shaft wall structure in which a start or arrival section for a shield machine of the peripheral wall of a vertical shaft can be easily cut by the shield machine; in which the partition wall portion of a preceding element forming frame can be thin-walled; in which assembly workability of the preceding element forming frame is improved. <P>SOLUTION: A ease of cutting material portion 11c of the first partition wall portion of a first preceding element forming frame 1 used for a start or arrival section for a shield machine S and a first free cutting reinforcement portion 13a formed of ease of cutting material of a reinforcement core material portion adjacent to the partition wall are maintained at an interval via a plurality of interval maintaining materials 15 intermittently provided in the vertical direction of the first preceding element forming frame 1. <P>COPYRIGHT: (C)2012,JPO&INPIT |
