Construction method of suspension bridge type tunnel spanning oversize karst cave

The invention discloses a construction method of a suspension bridge type tunnel spanning an oversize karst cave. The construction method of the suspension bridge type tunnel spanning the oversize karst cave comprises the following specific implementation steps: S1, loose stones are removed in a karst cavity rock wall, and sprayed concrete is adopted to protect a local serious area; S2, a main cable anchoring area at the top of the tunnel is excavated; S3, an anchorage is installed in the anchoring area, and anchoring area concrete is poured; S4, a main cable and a sling are erected, and a main beam is installed; S5, a pavement layer is poured; S6, tunnel lining structure concrete is poured; S7, a tunnel waterproof layer is laid; and S8, an anti-rockfall buffer layer is poured. The construction method of the suspension bridge type tunnel spanning the oversize karst cave is scientific, reasonable, safe and reliable, and the spanning capacity of a bridge in the construction of the oversize karst cave tunnel wit