| 摘要 |
PROBLEM TO BE SOLVED: To largely shorten a construction period; and to largely reduce construction costs without requiring to dam up a part of a river at installation. SOLUTION: This wooden mattress is composed of mutually parallelly arranged two L-shaped angle steel materials, a long leg bolt arranged in these angle steel materials and respectively upwardly raising a leg part from both end parts, two bar-shaped first stage outer frame woods extended between the angle steel materials and inserting the leg part of the long leg bolt and two bar-shaped second stage outer frame woods extended between the mutually parallelly arranged first stage outer frame woods and inserting the leg part of the long leg bolt, and is composed of two bar-shaped (n)th stage outer frame woods extended between a plurality of same stage set mutually parallelly arranged (n-1)th stage outer frame woods and inserting the leg part of the long leg bolt, a nut threadably attached to a tip part of the long leg bolt positioned inside the (n)th stage outer frame woods and fixing the mutual outer frame woods in a well crib shape and a suspending metal fitting detachably threadably attached to the leg part of the long leg bolt in an upper part of the nut. COPYRIGHT: (C)2004,JPO
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