| 摘要 |
PROBLEM TO BE SOLVED: To promote execution efficiency capable of simply and surely preventing the leakage of chemicals between step grouting areas and, etc. SOLUTION: When a tunnel is constructed, insert pipes 14 are connected to socket inlets of sockets 30 and 32 constituting a chemical grouting packer unit 10, and the insert pipes 14, packer unit 10 and, etc., are inserted into an AGF steel pipe. A packer 36 constituting the packer unit 10 is filled with the chemicals to form a partition wall. Accordingly, even if there are unevennesses in the outsides of the insert pipes 14, the leakage of the chemicals from the unevennesses is no cause for worry.
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