| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a tunnel structure capable of inexpensively preventing cracking in association with the dry shrinkage of a secondary lined concrete. <P>SOLUTION: In the tunnel structure on which an invert concrete 12 and a secondary lined concrete 14 supported by the invert concrete 12 are placed, the secondary lined concrete 14 has recessed portions 141 which form cavities between the invert concrete 12 and itself to reduce the effects of restricting the dry shrinkage of the secondary lined concrete 14 due to adhesive force between the invert concrete 12 and the secondary lined concrete 14. This suppresses tensile stress involving the dry shrinkage of the secondary lined concrete 14 to prevent cracking in the leg part center of the secondary lined concrete 14. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
