CONSTRUCTION METHOD OF THE MIDDLE SLAB OF A CIRCULAR TUNNEL HAVING DUPLEX ROADS AND STRUCTURE OF A MOVABLE FORM CAPABLE OF REDUCING CONSTRUCTION COSTS

摘要

PURPOSE: A construction method of the middle slab of a circular tunnel having duplex roads and the structure of a movable form are provided to reduce the construction time of a tunnel by simultaneously constructing upper and middle slab layers.;CONSTITUTION: A construction method of the middle slab of a circular tunnel having duplex roads comprises an air duct slab layer(3), a main slab layer(4), a movable form, a floor slab layer, and a prefabricated form. The movable form is horizontally connected to the air duct slab layer and the main slab layer. The floor slab layer is gradually placed using the prefabricated form.;COPYRIGHT KIPO 2011