RECEIVING FRAME OF COVER FOR UNDERGROUND STRUCTURE HAVING FALL PREVENTIVE LADDER

摘要

PROBLEM TO BE SOLVED: To provide a receiving frame of a cover for an underground structure having a fall preventive ladder capable of improving workability by securing an effective inner diameter of the receiving frame when standing up the fall preventive ladder. SOLUTION: This receiving frame is provided with the fall preventive ladder 5 being installed in the receiving frame 1 forming grips 3 and 4 on the inner periphery so as to be raisable and lowerable and having the tip side supported by a support seat 1c formed on the inner periphery of the receiving frame 1 in a falling-down state. A holding member 6 is installed by striding over a holding seat 1d and the grips 3 and 4 formed on the inner periphery of the receiving frame 1. A cutout 7d or an inserting hole is formed in a holding arm 7c positioned between the holding seat 1d and the grips 3 and 4 in this holding member 6. When standing up the fall preventive ladder 5, the inserting part 5e is inserted into the cutout 7c or the inserting hole to hold a rising attitude.