INVERT FORM OF SEWAGE MANHOLE USING EXPANSION TUBE AND CONSTRUTING METHOD THEREOF

摘要

PURPOSE: An invert form of a sewage manhole using an expansion tube and a constructing method thereof are provided to construct the invert form without standing water by flowing sewage in the expansion tube, dismantle equipment before completely curing concrete, and reduce constructing period. CONSTITUTION: An invert form of a sewage manhole using an expansion tube(1) is composed of the hollow expansion tube inserted into inlet and outlet parts(10b) of a manhole(10), arranged with an air injection inlet at a predetermined position of an outer peripheral surface, and expanded in injecting air; a height regulating device(3) mounted to an end of the expansion tube of the inlet pipe to regulate the height of the expansion tube to apply a step of the inflow and outflow parts of the manhole; a sheet fixed to the bottom of the expansion tube to increase the flow rate of sewage and impregnated with thermosetting resins to keep the shape of an invert with forming a floor surface of the invert; and a buoyancy preventing device(6) mounted to the upper part of the expansion tube to prevent the expansion tube from being floated.