| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide rails for a manhole lid opening-closing device, which allows a manhole lid opening-closing device to be smoothly moved irrespective of installation surface conditions, with improved workability to move a manhole lid for opening-closing operation. <P>SOLUTION: Rails 3 for a manhole lid opening-closing device 2 to be placed thereon, movable in horizontal direction comprises: a rails body 30 having a pair of rail members 31 and 31 extending in parallel at an opposing position across a manhole lid 1, on which the opening-closing device 2 is to be placed; and an extendable horizontal level adjustment part 32 disposed at least on an end position between the rails body 30 and an installation surface. <P>COPYRIGHT: (C)2012,JPO&INPIT |
