MANHOLE STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a manhole structure for allowing a controller to easily open a cover, and capable of coping with a case by immediately seizing its sign when a third person other than the controller opens a manhole. SOLUTION: This manhole structure is composed of a cover frame of the manhole and the cover capable of being housed inside the cover frame. A rotary shaft of a lock rotary body is arranged in the cover by penetrating through the obverse and reverse of the cover. An engaging pin for rotating together with rotation of the lock rotary body is protrusively arranged on the cover reverse side of the lock rotary body. A groove for engaging the engaging pin is arranged on the cover frame side. A stopper pin is inserted from a surface of the cover into a pin hole opening in the lock rotary body in a state of inserting the engaging pin into the engaging groove. A filler easy in breakup and dissolution can be filled in an exposure surface of the stopper pin to an aboveground part. COPYRIGHT: (C)2003,JPO