Construction method for tunnel snake-entangling-type surrounding shortcuts for high mountain, gorge and steep stream

The invention discloses a construction method for tunnel snake-entangling-type surrounding shortcuts for high mountain, gorge and steep stream. The construction method comprises the following steps that S1, an excavator is used for clearing dangerous rock and living stones in the stream and the feet of hillsides on the two sides; S2, shallow loosing blasting is adopted to excavate a through ditch in the stream, a concrete pipe is buried in the through ditch, and reinforced concrete is laid on the concrete pipe; and S3, the shortcuts and arch bridges are built along the stream from bottom to top, the shortcuts are arranged on the reinforced concrete in the step S2, the arch bridges are erected on the reinforced concrete in the step S2, the shortcuts and the arch bridges are arranged alternately, the shortcuts and the arch bridges are sequentially connected end to end and arrayed in a Z shape, switching platforms are built at the junctions of the shortcuts and the arch bridges, the shortcut at the lowest end communicates with a ground road, and the shortcut or the arch bridge at the uppermost end communicates with a tunnel inclined shaft. According to the construction method, the transporting problem is solved, construction of a main tunnel of a tunnel is achieved, the cost is lowered, and the construction period is shortened.