BITING RELEASE STRUCTURE OF LID FOR UNDERGROUND STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a biting release structure of a lid for an underground structure capable of securely preventing flowing-in of rainwater into the underground structure by achieving satisfactory water cut-off performance and releasing biting of a lid main body without requiring an exclusive bar. SOLUTION: A bar hole 7 is formed on a central side more than an outer peripheral fringe of the lid main body 3 to ensure the water cut-off performance between a receiving frame 2 and the lid main body. A movable fulcrum lid 21 is upward energized by a compression spring 26 to close the bar hole. A stopper part 51 for regulating lowering of a strut 11 being integral with the movable fulcrum lid is formed in the receiving frame. An upper face of the movable fulcrum lid when regulating lowering of the propping-up member is utilized as fulcrums of the bars 41, 41a to release biting by letting upward force act on the lid main body by the principle of lever. COPYRIGHT: (C)2007,JPO&INPIT