| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve connecting workability in adjacent floor parts by permitting at least one of synthetic resin-made floor plate bodies to have plural floor parts which are connected so as to be freely rotatable with thin hinges. SOLUTION: The second floor plate body 23 of a floor plate device 21 is formed by integrally connecting the first and the third floor parts 31a, and 31c with a synthetic resin through the thin hinges. Therefore, the production of the second floor plate body 23 is easy as compared with a case when the respective floor parts 31a-31c are independently molded and connected by rods and also production is efficiently executed. The attaching part of a reinforcing member 34 is connected and fixed to the second floor part in the width direction end part of the second floor plate body 23 and rotary parts 37 are respectively disposed by connection to the first and third floor parts 31a and 31c. Therefore, even when a load is nonuniformly added to the first floor parts 31a and the third floor part 31c, the addition of shearing force from the respective floor parts 31a and 31c to the thin hinges 32 is suppressed by the rotary parts 37 and the tin hinges are prevented from being broken in an early stage.</p> |
