Temporary inverted arch structure of tunnel and using method

The invention discloses a tunnel temporary inverted arch structure and a using method, the tunnel temporary inverted arch structure comprises n arc-shaped sections, the n arc-shaped sections are sequentially and detachably connected to form the inverted arch structure, and the xth arc-shaped section and the (x + 1) th arc-shaped section are detachably connected through an adjusting assembly, the adjusting assembly comprises a sleeve and a displacement adjusting device arranged in the sleeve, and the two ends of the sleeve are movably arranged at one end of the xth arc-shaped section and one end of the (x + 1) th arc-shaped section in a sleeving mode correspondingly. The two sides of the displacement adjusting device abut against one end of the xth arc-shaped section and one end of the (x + 1) th arc-shaped section respectively, and the displacement adjusting device can adjust one end of the xth arc-shaped section to be close to or away from one end of the (x + 1) th arc-shaped section. The temporary inverted