Inverted arch structure and construction method therefor

An inverted arch structure, comprising:

• an arch body (10), an arc-shaped through-slot (11) along a direction perpendicular to an extension direction of a tunnel being disposed on an arc-shaped bottom surface of the arch body (10), and two ends of the arc-shaped through-slot (11) extending to top sides of the arch body (10),
• reserved steel bar connectors (20), comprising a plurality of first steel bar connectors (21) uniformly arranged at bottom edges of two sides of the arch body (10) along a length direction, and a plurality of second steel bar connectors (22) uniformly arranged at top edges of two sides of the arch body (10) along a width direction, and
• two positioning mechanisms (30), symmetrically arranged at top side edges of the arch body (10) along the length direction, each of the positioning mechanisms (30) being correspondingly arranged at an end of the arc-shaped through-slot (11), and the positioning mechanisms (30) being suitable for adjusting an angle between the arch body (10) and a steel arch frame, to allow the arc-shaped through-slot (11) of the arch body (10) to be clamped with a connecting plate of the steel arch frame, wherein
• each of the positioning mechanisms (30) comprises a connecting base (31), a movable block (32), and a movable fork head (33), the connecting base (31) being fixed on the arch body (10), the movable block (32) being vertically and slidably connected to the connecting base (31), the movable fork head (33) perpendicularly penetrating through the movable block (32) along a horizontal direction, and the movable fork head (33) being capable of adjusting the opposite arc-shaped through-slot (11), wherein
• the connecting base (31) comprises a bottom base body (311) and a first connecting block (312), the bottom base body (311) being vertically and fixedly connected to a top edge of the arch body (10) near the arc-shaped through-slot (11), and the first connecting block (312) being fixedly connected to a middle upper part of a side of the bottom base body (311) facing away from the arc-shaped through-slot (11);
• the movable block (32) comprises a top base body (321), a second connecting block (322), a first bolt (323), and a second bolt (324), the top base body (321) being vertically and slidably connected to the bottom base body (311), the second connecting block (322) being horizontally and fixedly connected to a top side of the top base body (321) and located directly above the first connecting block (312), an adjustable clamping gap (3221) being disposed on the second connecting block (322), the first bolt (323) being vertically threaded through the second connecting block (322), and a lower end of the first bolt (323) being rotatably connected to an upper side of the first connecting block (312);
• and the second bolt (324) being threaded and locked on the second connecting block (322) and located at an opening end of the adjustable clamping gap (3221) to adjust an opening degree of the adjustable clamping gap (3221);
• and
• the movable fork head (33) comprises a third connecting block (331), a third bolt (332), two guide posts (333), and two fork bodies (334), the third connecting block (331) being located on a side of the bottom base body (311) facing away from the first connecting block (312), the third bolt (332) being threaded through a middle of the top base body (321), and being rotatably connected to a middle of the third connecting block (331), the two guide posts (333) being horizontally and symmetrically connected to two sides of the third connecting block (331) in a parallel manner, each of the guide posts (333) slidably penetrating through the top base body (321), and the two fork bodies (334) being horizontally and symmetrically connected to a side of the third connecting block (331) facing away from the guide posts (333) in a parallel manner.