Construction method for CRD (center cross diaphragm) inverted arch

The invention discloses a construction method for a CRD (center cross diaphragm) inverted arch. The construction method comprises the following steps: 1), installing a temporary steel support; 2), breaking a center cross diaphragm near the temporary steel support; 3), constructing a bottom levelling layer, a waterproof layer and a protective layer for the temporary steel support; 4), applying pre-stress; and 5), constructing the inverted arch: breaking the rest center cross diaphragm, constructing a levelling layer, a waterproof layer and a protective layer, applying reinforcement, mould boards and concrete, using concrete of the same grade to backfill the middle part of the concrete inverted arch, and simultaneously pouring 30cm-high concrete on the two side walls. The construction method has the advantages of reducing structural construction seams, avoiding frequent conversion between processes, achieving strong structural integrity, completely sealing the waterproof layer and effectively controlling land s