| 摘要 |
PROBLEM TO BE SOLVED: To surely perform frost heaving prevention, reduce a construction cost and a running cost, and easily perform maintenance. SOLUTION: An under floor blast piping 25 constituted by a perforated pipe is arranged inside an under floor crushed rock layer 19. A hot air by an exhaust heat of a refrigerator outside machine 16 and an outside air which is taken into a space between an outer wall 29, a roof 28 of a building 11 and a wall of a freezing chamber 12 and is made to flow in the space are sent to the blast piping in a switchable manner. COPYRIGHT: (C)2004,JPO
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