| 摘要 |
PROBLEM TO BE SOLVED: To provide back fill for an existing structure, which establishes compatibility between maintenance of an attitude of an abutment and prevention of a step in a boundary by improving earthquake resistance.SOLUTION: An embracing bag 30 comprises a U-shaped cross-section top sheet 31, and a side sheet 32 for closing both end openings of the top sheet 31. Front surfaces and front side surfaces of a plurality of fill layers 21 are enclosed with the embracing bag 30 made of the sheet. An end of the embracing bag 30 is fixed between the fill layers 21. The front surfaces and front side surfaces of the plurality of fill layers 21 are embraced by the embracing bag 30. |
