Tunnel center drainage ditch and inverted arch filling integrated construction method

The invention provides a tunnel center drainage ditch and inverted arch filling integrated construction method. The method comprises the following steps that (1) inverted arch lining construction is completed; (2) horse stool supports are installed on at least two positions of the inverted arch lining; (3) a combination of the non-dismantling formwork net and reinforcing steel bars is constructed; (4) mounting the combined body on the split heads at the two positions in the step (2); (5) a horse stool I used for supporting the front section of the tunnel center ditch pouring formwork is installed; (6) a tunnel center ditch pouring formwork is installed in the combination body; (7) center drainage ditch cover plate reinforcing steel bars are installed on center drainage ditch body reinforcing steel bars on the two sides; the construction method comprises the following steps of (1) installing a retaining head template, (2) installing a retaining head template, (3) pouring inverted arch filling concrete, (4) pou