Large-dip-angle tunnel anchor narrow space splay saddle sliding installation system and method

The invention is suitable for the field of construction engineering tunnel anchor construction and provides a large-dip-angle tunnel anchor narrow space splay saddle sliding installation system and method. The installation system comprises a splay saddle portal frame, a sliding rail, a counter-pulling system and a sliding trolley. The sliding rail is obliquely mounted downwards; a chain hoist is arranged on the splay saddle portal frame; a bottom plate seat is fixed on the splay saddle foundation below the splay saddle portal frame; a cylindrical surface steel support is arranged on the bottomplate seat; the counter-pulling system comprises a counter-pulling winch arranged on a winch foundation outside a tunnel anchor hole, a pulley block and a steel wire rope, the counter-pulling winch is connected with the steel wire rope, and the steel wire rope pulls the splay saddle through the pulley block. The sliding rail and the counter-pulling system are designed mainly for installing the splay saddle in the large-d