BEAM SKELETON CONSTRUCTION METHOD IN UNDERGROUND INVERTED CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a beam skeleton construction method in an underground inverted construction method facilitating the carrying-in a beam form material and set it and to extensively reduce production of construction by-products. SOLUTION: A beam bottom form 3 is constituted of a thin steel plate 1 and a fixed projection 2 set on the thin steel plate 1 at the time of depositing level concrete 9 after drilling excavation and building the beam bottom form 3 and a beam side form 6 on the level concrete 9. Rising parts 1a are previously provided on both end parts of the beam bottom form 3 in the cross direction. Thereafter, the beam side form 6 is constituted of a thin steel plate 4 and a reinforcing rib 5 fastened on an inner surface of the thin steel plate 4 and extending in the vertical direction. Thereafter, the beam side form 6 is connected to the beam bottom form 3 by inserting a lower end part of the beam side form 6 into the rising parts 1a of the beam bottom form 3 arranged on the level concrete 9.