To provide a fire resistant structure for backfill injection hole in which construction is simplified, work such as check or repair is facilitated and a cut-off performance and fire resistance can surely be secured, and a method of forming the fire resistant structure for the backfill injection hole.
In a backfill injection hole 3 formed in a tunnel segment 1 installed along a wall surface of a natural ground 13, a check valve 19 is installed at a predetermined interval from the natural ground 13, and a space between the check valve 19 and the natural ground 13 is filled with a back filler 51. Next, at a predetermined interval in a tunnel internal vacant direction from the check valve 19, a steel cock 23 is installed which includes a lock portion corresponding to the backfill injection hole 3, a cover portion capable of closing the backfill injection hole 3 and a cock protector lock portion provided in the cover portion. Thereafter, at a tunnel internal vacant side of the cock 23, a ceramics cock protector 27 is installed which has a recess as a lock portion corresponding to the cock 23. The cock protector 27 closes a diameter-expanded portion 11b of the backfill injection hole 3 as a whole.
FURUICHI KOSUKE
ARAI TAKAHIRO
HONDA TOMOAKI
NAKAGAWA MASAYOSHI
SUZUKI YOSHINOBU
IWAZUMI TOMOKAZU
TAMADA KOICHI
| JP2010168771A | 2010-08-05 | |||
| JP2010229786A | 2010-10-14 | |||
| JP2002038887A | 2002-02-06 | |||
| JP2006022612A | 2006-01-26 | |||
| JPH11117693A | 1999-04-27 | |||
| JP2010242307A | 2010-10-28 |
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