Construction method of egg-type underpass channel bridge

The invention discloses a construction method of an egg-type underpass channel bridge. The construction method comprises the following steps that, (a) a concrete bridge abutment is poured; (b) a support system is built up on a concrete basis of the bottom of a underpass channel; (c) a box girder pouring formwork system is built up on the support system, concrete is further poured into the formworksystem, and on-site concrete pouring of a box girder is completed. The construction method is mainly aimed at the construction technology of the egg-type underpass channel bridge, stress needs of endstructures can be met through box girder end support structures at two ends of an underpass channel, and an arc-shaped support area, a steel pipe support area and a full framing area which are set through calculation are adopted to coordinately form an arc-shaped support structure on the upper part of the underpass channel, arc-shaped frameworks are laid on the steel pipe support area and the full framing area, the flexib