| 摘要 |
PROBLEM TO BE SOLVED: To provide a precast board for secondary lining, which can reduce labor required for arranging the same on an internal surface of a tunnel, and to provide a method for executing secondary lining. SOLUTION: The precast boards B for secondary lining are axially connected together by engaging both engaging members 50 together which are embedded in end portions of the precast boards, respectively. Then, the plurality of precast boards B for secondary lining are connected together in the axial direction, and the thus connected precast boards are collectively arranged on the internal surface of the tunnel at a time.
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