It starts leaping, application modulo null of the independent

摘要

PROBLEM TO BE SOLVED: To eliminate the need for the temporary fixing of a step board, to fix an independent stair in single operation and improve workability and to attain reliability even in strength when the outrigger independent stair is installed on the outer of the wall body of a building. SOLUTION: Sleeves 4 for joining are buried into a step board 1 consisting of a precast concrete board as connecting members, a joint bar 14 for connection is projected in a stepped shape from the wall body 12 of a building frame, and the joint bar 14 is inserted into the sleeves 4 for joining and the side section of the step board 1 is mounted on the wall body 12. The insides of the sleeves 4 for joining are filled with fillers 30 such as mortar, and fixed onto the wall body 12.